LV Capacitor Bank Specs. January 2011

- MINISTRY OF ELECTRICITY & WATER - KUWAIT SPECIFICATION FOR CAPACITOR BANKS TO IMPROVE POWER FACTOR

IN LOW VOLTAGE ELECTRICAL DISTRIBUTION SYSTEMS

MEW-EDN-F.AH./ 01-01-2011 Page1

GOVERNMENT OF KUWAIT

MINISTRY OF ELECTRICITY & WATER

SPECIFICATION FOR

CAPACITOR BANKS TO IMPROVE POWER FACTOR


JANUARY 2011




GOVERNMENT OF KUWAIT

MINISTRY OF ELECTRICITY & WATER

SPECIFICATION FOR CAPACITOR BANKS TO IMPROVE

POWER FACTOR IN LOW VOLTAGE ELECTRICAL DISTRIBUTION SYSTEMS

I - GENERAL 1. Attention:

This specification for capacitor banks to improve power factor in low voltage electrical distribution systems, issued by the Ministry of Electricity & Water (MEW), Kuwait, shall govern all government and private sector projects and installations throughout the State of Kuwait as applicable under the Ministerial Decree No. 5/2010 dated 18th January 2010. The specification and/or any part thereof cannot be altered or amended without the knowledge of the Ministry of Electricity & Water, Kuwait, and attention is drawn to all Consumers/Owners, Consultants, Suppliers, Manufacturers and Contractors that while specifying and making provision for such capacitor banks, the Ministry specification shall be strictly adhered to in its full extent and the Ministry only will be the sole authority to give the technical approval. Should there be a need to deviate from and/or to include any specific requirement for a particular project, a written approval shall be obtained in all cases from the Ministry of Electricity & Water. The Ministry has the right to take all administrative procedures and legal implications of the violation of this resolution. All previous issues of this specification and issue of any part or section thereof are now obsolete and superseded by this present issue.

2. Scope:

This specification covers the design, manufacture, assembly, testing at the manufacturers works at country of origin before dispatch, installation details, site testing, warranty, etc., of the Automatically Switched Low Voltage Capacitor Banks to be installed and connected at the Main LV Distribution Board buses and/or at the Sub-main Distribution Board buses of the electrical distribution systems or at the service intake of the consumers, in order that the power factor can be maintained within 0.95 lagging and unity, as to the regulations of the Ministry of Electricity and Water, Kuwait.

3. Electrical Distribution Systems in Kuwait:

The equipment required shall be suitable for the electrical distribution systems, the characteristics of which are:

System voltage 11 KV 415 volts.

System Highest Voltage 12 KV 457 volts.




Frequency 50 Hz. 50 Hz.

Neutral point Earthed solidly or through Solidly earthed 10.5 Ohms resistance. Maximum fault level 31.5 kA at 12 KV 50 kA Maximum fault duration 1.25 seconds 0.50 seconds. 4. Standard Specifications:

i) All materials and equipment shall comply as a minimum:

A) With the latest relevant recommendations of the International Electro-Technical Commission (IEC) or relevant standards/recommendations of American National Standards Institution (ANSI), Institute of Electrical and Electronics Engineers (IEEE) and/or Underwriter Laboratories (UL), if available.

B) If (A) above is not available, with the latest relevant British Standard Specification (B.S.S). This applies to quality of material, testing etc.. If standards as mentioned above contradict with this specification, then the requirements of this specification shall apply.

ii) Manufacturers who manufacture materials and equipment based on standards other than those

mentioned under (i) above can do so provided they confirm that such standards meet the requirements under (i) as a minimum and shall prove this if needed by the Purchaser.

iii) What is mentioned under (i) and (ii) above applies to wherever BSS is mentioned in the different

clauses of this specification. 5. Climatic Conditions:

Climatic conditions in Kuwait are rigorous and the summer season during which the equipment will function under continuous maximum load conditions is long and shall be considered to fall during the period starting from 15th April till 15th November. The remainder of the year shall be considered as winter season since autumn and spring seasons are very short in Kuwait. The following are prevailing atmospheric conditions: Ambient temperature in shade : Maximum 55 Degrees C (summer day)

: Minimum 6 Degree C (winter night) Maximum sun radiation

temperature as measured with a black bulb thermometer : 85 Degrees C. Average maximum ambient temperature : 45 Degrees C.




Periods of high humidity are common and a humidity of 100% has been recorded at 30 degrees centigrade. However, high temperature is normally accompanied with low humidity. Violent sand and dust storms occur with wind speeds up to 120 Km/hour, and even on comparatively still days, fine dust is carried in suspension in the atmosphere. The average rainfall in a year is 15 cms. but this can be concentrated into 2 or 3 severe downpours.

The capacitors banks, series reactors, power factor controllers, power quality meters, switchgear and other equipment called for in this specification must give continuous and trouble free service under the arduous conditions mentioned above. The electrical rooms wherein the capacitor banks will be installed shall have suitable air-conditioning systems to ensure uninterrupted operation of these devices.




II TECHNICAL STUDIES AND

DETAILS OF RESPONSIBILITIES & REQUIREMENTS

The supplier/manufacturer/contractor before supplying and installing any capacitor banks in any part of the electrical distribution systems, shall carry out a comprehensive facility survey, study and cost analysis in order to ensure that maximum benefit is derived from installing such capacitor banks with respect to the KVAR saving and power quality improvement, and there will be no undue problems of any kind when the capacitor bank is installed into a distribution system, in particular, problems arising from harmonic currents due to the presence of non-linear loads in the system and/or from harmonic resonance and capacitor switching transients.

The supplier/manufacturer/contractor shall be fully responsible for his equipment and installation of capacitor banks into electrical distribution systems and in case of any damage to any distribution system equipment like transformer, switchgears, cables, etc. due to negligence to his work, improper study of the distribution system and/or unsuitable equipment selection and installation, at any time starting from the initiation of the installation works up to a period of three (3) years from the date of commissioning, the supplier/manufacturer/contractor has to replace all damaged distribution system equipment with new ones as approved by the Purchasers Engineer and at no extra cost whatsoever. In addition, for any power failure due to such incidents, a penalty of KD.100/- per hour will be charged from the supplier/manufacturer/contractor till the power supply is satisfactorily reinstated after all repair and replacement works.




III DETAILS OF EQUIPMENT AND MATERIALS

A) POWER FACTOR CORRECTION CAPACITOR BANKS :

1. Type:

The power factor correction capacitor banks shall be three phase, of modular design, shall be switched ON/OFF automatically in steps through the use of Electromagnetic Contactors designed for capacitor switching or shall be Thyristor controlled depending on the type of electrical loads and shall incorporate series reactors for blocking harmonic current and to prevent resonance. The supplier/manufacturer/contractor shall study the load profile before selecting the suitable type of switching system.

2. Normal Rating:

The normal rating of the capacitor banks shall be the maximum continuous rating at an ambient temperature of 52oC (Fifty-two degrees centigrade) as frequently encountered in Kuwait during the peak summer days.

3. Applicable Standards:

Unless specified otherwise the capacitor banks shall conform in design, material, construction and performance to the latest editions of the IEC standards, their corresponding British/European (BS EN) or American (ANSI, UL) standards and in particular to the following publications :

IEC 61921 : Power capacitors Low voltage power factor correction banks.

IEC 60831-1 : Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1000 V - Part I: General Performance, testing and rating - Safety requirements - Guide for installation and operation.

IEC 60831-2 : Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1000 V - Part 2: Ageing test, self-healing test and destruction test.

IEC 61439-1 : Low-Voltage Switchgear and Controlgear Assemblies - Part 1:

General Rules IEC 60076-6 : Power transformers - Part 6: Reactors IEC 60747-6 : Semiconductor devices. Discrete devices. Part 6: Thyristors. IEC 60085-1 : Electrical insulation Thermal evaluation and designation.




IEC 60664 : Insulation coordination for equipment within low-voltage systems. IEC 60947-1 : Low-voltage switchgear and controlgear - Part 1: General rules

IEC 60947-2 : Low-voltage switchgear and controlgear - Part 2: Circuit-breakers. IEC 60947-3 : Low-voltage switchgear and controlgear - Part 3: Switches,

disconnectors, switch-disconnectors and fuse-combination units.

IEC 60947-4-1 : Low-voltage switchgear and controlgear Part 4-1: Contactors and motor starters.

IEC 60502-1 : Power cables with extruded insulation and their accessories for

rated voltages from 1 kV (Um=1.2 kV) up to 30 KV (Um=36 kV) Part-1: Cables for rated voltages of 1 kV (Um=1.2 kV) and 3 KV (Um=3.6 kV).

IEC 60529 : Degree of protection provided by enclosures (IP code).

BS EN 14604 : Smoke alarm devices. UL 508A : Low voltage switched power factor correction banks assembly.

UL 810 : Low voltage capacitors. IEEE 519-1992 : IEEE Recommended Practices and Requirements for Harmonic

Control in Electric Power Systems.

In addition to the above listed standards, the regulations for electrical installations issued by the Ministry of Electricity & Water, Kuwait, shall also be adhered to.

4. Drawings and Information:

The consumer/owner and/or his consultant or contractor shall prepare and furnish the following drawings and documents along with their submittal for approval of the capacitor bank by the Ministry of Electricity & Water.

i) A copy of the load form which has been made available to the Electrical Installation Department

of the Ministry of Electricity & Water.

ii) Projects schematic diagram of the electrical distribution system.

iii) Design calculations for KVAR capacity of the capacitor banks in originals as per MEW practice, duly signed and stamped by the consultant/contractor and manufacturer.

iv) Design calculations for harmonic distortions in originals duly signed and stamped by the

consultant/contractor and manufacturer. A declaration shall be submitted stating that active harmonic filters will be provided in case the measurements after installation lead to such requirements.




v) Consultant/contractors study report on the type of electrical load of the project along with supplier/manufacturers recommendation on the suitability of the proposed capacitor bank, duly signed and stamped.

vi) Manufacturers technical brochure/catalogues for various major components.

vii) Dimensional drawings showing constructional details of capacitor banks with details of all

components including schematics for protection and controls of the capacitor bank.

viii) Complete type test reports and certificates for a 400 KVAR capacitor bank, capacitor units and other major components from independent test laboratory (ASTA, KEMA or, CESI).

ix) Technical manual giving installation, operation and maintenance instructions

x) Suppliers/manufacturers/contractors guarantee on the capacitor banks in original letterhead

for a period of three (3) years from the date of commissioning for fully satisfactory operation and running of the equipment and against any manufacturing defect and mal-functioning.

xi) Letter of confirmation on the provision of air-conditioning for the Electrical/LT room wherein the

capacitor banks will be installed.

xii) Declaration by the manufacturer/local agent that testing and commissioning of the capacitor banks will be carried out by qualified and trained manufacturers and/or local agents engineer/specialist.

xiii) Original payment receipt along with a copy of the same. Original receipt will be returned after

scrutinizing.

B) CAPACITOR UNITS :

The capacitor units required for the different types of low voltage capacitor banks shall be Dry or Oil Capacitors, self-healing type with individual discharge resistors and shall be protected against internal faults, over pressure, etc., and manufactured in full compliance with and tested to the requirements of the International Electro-technical Commission Publication No. IEC 60831, Part-1 and Part-2. a) The capacitor units will be installed in an electrical distribution system having system voltage of 415

volts (System highest voltage 457 volts) and shall be rated at 525 volts or higher due to the voltage rise caused by connecting the detuned series reactors and considering the worst temperature conditions encountered in Kuwait.

b) The capacitor units shall be of single phase or three phase type.

c) The ambient temperature category of the capacitor units shall be -5/D as a minimum to IEC

Publication No. 60831, Part-1.

d) The capacitance of the capacitor units shall not differ from the rated capacitance by more than 5 % to +10 % for units and banks up to 100 KVAR and 5 % to +5 % for units and banks above 100 KVAR.




e) The capacitors shall be of the self-healing type and the dielectric for dry capacitor units shall be from low-loss metallised polypropylene film. The dielectric for oil capacitor units shall be from double metallised paper and polypropylene or metallised polypropylene having PCB-free oil impregnation.

f) The dry capacitor units shall be completely leakage proof and of dry type construction without any

filling of jelly, wax, etc.

g) The capacitor element casings for dry capacitor units shall be from Aluminium or high temperature withstanding nonflammable material and for oil capacitor units the casings shall be Aluminium.

h) The capacitor units shall have suitable adequate protection to ensure safe disconnection from the

circuit in case of an excessive internal temperature rise and/or an abnormal increase of the internal pressure either by having an internal fuse link combined with a secondary solid foil electrode or by an overpressure disconnector device. The capacitor units with overpressure disconnector device shall have visual indication for easy identification of damaged units with naked eye.

i) The capacitors shall have permanently connected built-in discharge resistors to ensure safe

discharge of the capacitors to less than 50 volts in 1 minute after switch off. j) The total losses including discharge resistors to be less than 0.5 Watt/KVAR.

k) All exposed terminals and discharge resistors of the capacitor units shall be adequately shrouded.

l) The capacitors shall be rated for a minimum of 130% continuous current overload and 110%

continuous voltage overload based on the Rated Voltage of the capacitors.

m) Suitable rating plates from non-corrosive material shall be provided on each capacitor unit giving fully detailed information as follows:

Capacitor Unit Rating Plate :

a) Manufacturer. b) Serial number and manufacturing year. c) Rated total output in kilovars (KVAR) d) Rated voltage in volts (V). e) Rated frequency in hertz (Hz). f) Temperature category and temperature range. g) Discharge device. h) Reference of self-healing design. i) Connection symbol. j) Internal fuses (if provided). k) Indication for the overpressure. l) Insulation level in kilovolts (KV).

m) Reference to IEC 60831 (plus year of issue of the edition).




C) SERIES REACTORS TO PREVENT AMPLIFCATION OF SYSTEM HARMONICS :

The three phase series reactors to be connected in series with each capacitor unit for blocking harmonic current and to prevent resonance shall be iron cored type with copper windings. The reactor shall comply with the IEC Publication No. 60076-6. a) The current ratings of the reactors shall be increased suitably to take into account the effect of

harmonics in the networks which could be generated by variable speed drives, dimmers, elevators, UPS system, fax machines, computers, fluorescent and other discharge lamps, etc. The offered reactors shall be tested by harmonic current generating test equipment with magnitudes corresponding to the maximum harmonic current magnitudes measured in any distribution system. All necessary test reports for such tests and measurements shall be submitted to the Purchaser for scrutiny and record purposes.

b) The reactor insulation shall be Class H rated at 180oC to IEC 60085-1. The maximum temperature

of the reactor at maximum continuous RMS amperage shall be no higher than 145oC with a 55oC ambient. The maximum continuous RMS amperage of the reactor shall be sized to match the maximum continuous RMS amperage of the capacitors. The minimum reactor Q factor shall be 25.

c) The reactors shall be equipped with snap action thermostats to trip at 160oC and shall be wired to the associated controller output contact. In the event of a reactor over temperature the stage contactor shall open. There should be an option of automatic re-closures or latching action. When a higher class of insulation rated at 220oC is provided for the reactors, the snap action thermostats shall be set to trip at 180oC.

d) The capacitors and the reactors combination shall be tuned below the third harmonic frequency level.

The supplier/manufacturer/contractor must ensure that the compensation of reactive power at fundamental frequency is achieved along with avoidance of resonance at harmonic frequency.

D) SWITCH-DISCONNECTORS:

The capacitor bank shall have a suitably rated switch-disconnector at the incomer. The switch-disconnector shall be three-pole and shall fully comply with the requirements of the IEC 60947-1 & 3. The rated insulation voltage of the switch-disconnector shall be minimum 690 V and it shall be designed for continuous operation in ambient temperatures of up to 52oC or shall be derated accordingly. The rated operational current shall be at least 1.5 times the full load current of the capacitor bank and the rated short time withstand current, 50 kA for 0.5 second. It shall have a class of duty AC-22B. It shall have a rotary front operating door mounted handle and should be interlocked with the door to ensure that the capacitor bank is de-energised when door is open. Each stage of the capacitor bank shall have a suitably rated moulded case circuit breaker (MCCB) or high rupturing capacity (HRC) fuses together with a thermal magnetic overcurrent relay for overload protection. The circuit breaker and the thermal magnetic overcurrent relay shall be adjusted to trip if the RMS current of the stage exceeds 130%.




E) THYRISTOR SWITCHED CONTACTOR : The thyristor switched contactor shall fully comply with and tested to the requirements of the relevant IEC and/or BS specifications and shall be rated for 2200 PIV. They shall be fully suitable for the extreme temperature and weather conditions prevailing in Kuwait and guaranteed for fully satisfactory operation and running under such temperature and weather conditions.

a) The thyristor switched contactor shall be capable of handling the continuous current of 130% of the

rated capacitor current at rated voltage of 415V. The blocking voltage of the thyristor switch during off condition should be minimum 2200 Volt peak. Every thyristor switch should be capable of handling the dv/dt of 2000 Volts/S. This is to avoid spurious turn off while powering up as well as due to supply transients.

b) The thyristor switched contactor used shall turn on at zero differential voltage across it. This zero

differential voltage tolerance shall not exceed 6 Volts peak value around zero.

c) The time delay between turn off and subsequent turn on should be as minimum as possible and in the range of milliseconds. There should not be any discharge devices across capacitor that can exceed the watt loss of more than 30 watt. The capacitors should not be discharged to zero level before they are put back in the circuit. The differential zero voltage sensing should even be able to capture the zero voltage instance even when voltage across the capacitors is equal to the peak of the mains voltage waveform. (This is to avoid wastage of energy stored in capacitor while fast switching conditions.)

d) The thyristor switched contactor should be provided with adequate protections against any external

transients that creates current and/or voltage spikes. Adequate arrangement like forced commutation and/or tuning reactors shall be provided with every thyristor switched unit block to prevent the thyristors from exceeding its i2t rating.

e) Over-Temperature of Heat-Sink :

The heat sink on which the thyristors are mounted shall be monitored continuously for over temperature. The over temperature fault shall switch off the thyristor switches put on the heat sink. The recommended trip level is at 800C. This fault shall have an auto-restart function.

F) ELECTROMAGNETIC CONTACTOR :

The electromagnetic contactors shall be 660 Volts rated, of 3-pole type suitable for switching 'on' and switching 'off' operations of capacitor banks and shall comply with the requirements of the IEC 60947-1 & 4-1. The supplier shall choose a contactor of a suitable operational current rating taking into consideration the inrush current and the special considerations of capacitor switching duty. Incidence of higher inrush current in the case of successive switching of capacitor banks shall also be taken into account. The supplier shall furnish data sheet of contactor in support of proper selection of the contactor rating including the making and breaking current ratings. The contactors shall isolate all three supply phases to the capacitor on switch off. The rated voltage of control coil shall be 415V (phase-to-phase). This voltage is subject to a variation of (+) 10% and (-) 15%. The contactors shall work satisfactorily within this voltage range. The pick up voltage of coil shall be 60% and drop out voltage shall not be more than 50% of rated voltage.




The mechanical endurance of the contactors shall not be less than 3 million operating cycles at no load. The electrical endurance at normal utilization duty for capacitor shall not be less than 200,000 operations.

The contactors shall be subjected to routine and type tests as described in IEC 60947.

G) ACTIVE HARMONIC FILTERS FOR HARMONIC CURRENT FILTERATION:

The active harmonic filters shall be provided only if the measurements of total harmonic current and voltage distortions after installation and commissioning of the capacitor banks and energizing of full load exceed the limits specified in IEEE 519. The active harmonic filters shall work on the principle of measurement of harmonic currents and generate actively a harmonic spectrum in opposite phrase to the measured distorting harmonic current thereby canceling the original harmonics. a) The rating of the active harmonic filters shall be so selected that the total harmonic current and

voltage distortion at the point of common coupling is brought down to below the total harmonic current and voltage distortion limits specified in IEEE 519, as extracted below.




b) Should there be a large component of single phase non linear loads present in a distribution system (offices, shopping malls, etc.) then measurements/calculations must be carried out to ascertain the magnitude of the third harmonic current and provisions shall be made for a suitably rated 3 Phase, 4 wire active harmonic filters.

c) Should there be a large component of three phase non linear loads present in a distribution system

(Industrial loads with VFDs etc) then measurements/calculations must be carried out to ascertain the magnitude of the third harmonic current and provisions shall be made for a suitably rated, 3 Phase, 3 wire active harmonic filters.

d) The active harmonic filters shall be of parallel configuration. e) The active harmonic filters shall monitor all three phases of the low voltage line current in real time by

means of a Digital Signal Processor (DSP). f) The output of the DSP unit in combination with a micro-controller based system shall generate a

pulse width modulated (PWM) signal to control power modules based on IGBT (Insulated Gate Bipolar Transistor) technology which act as a current source.

g) The PWM signal shall be of fixed switching frequency. h) The system shall be operated under closed loop control and shall have a maximum response time of

not more than 40 milliseconds. The control system shall be such that the Active Filter cannot be overloaded.

i) Simultaneous filtering shall be provided for all harmonics up to the 50th one. j) The filtering efficiency shall be typically of better than 97%. k) The operating power factor of the active harmonic filters shall be programmable over the range 0.7

capacitive to 0.7 inductive. l) The active harmonic filters shall be protected against over current, short-circuit, thermal overload and

IGBT bridge abnormal operation. m) The design of the active harmonic filters shall be such that the current rating of the filter system can

be increased by the addition of extra power modules. n) Graphic monitoring of the wave shape shall be provided.

o) On-line harmonic analysis shall be provided. p) After the installation of the active harmonic filters, harmonic measurements shall be carried out to

prove that the total harmonic distortion is within IEEE 519 limits.




H) AUTOMATIC POWER FACTOR CONTROLLER:

The automatic power factor controller shall be microprocessor based VAR Sensing type and shall comply with IEC 61326. The controller shall be able to sense the reactive current requirement and switch on / off to the required stage of the capacitor bank. a) The automatic power factor controller shall maintain a targeted power factor within 0.95 lagging and

unity. b) The controller shall be programmed to have different switching sequences. In general, for 500, 450,

400 and 350 KVAR Capacitor Banks, the sequences shall be respectively 1:1:2:2:2:2 (i.e., 50/50/100/100/100/100 KVAR), 1;1:1:2:2:2 (i.e.,50/50/50/100/100/100 KVAR), 1:1:2:2:2 (i.e., 50/50/100/100/100 KVAR) and 1::2:2:2 (i.e., 50/100/100/100 KVAR) and similar. Other switching sequences as per the manufacturers recommendation shall also be considered.

c) The controller shall have provision for manual operation capability to switch on/off the stages manually

for maintenance and troubleshooting purposes.

d) The controller shall sense current from a single phase and voltage from two phases to compute the average 3-phase power factor and accordingly compensate by switching in necessary capacitor stages.

e) The voltage input to the controller shall be direct or through a VT and shall be protected by a fuse. f) The controller shall be suitable for 1A or 5 A current input. g) The voltage on the capacitor terminals may be particularly high at times of light load conditions. In

such cases, some or all of the capacitors shall be switched out of circuit in order to prevent overstressing of the capacitors and undue voltage increase in the distribution system.

h) The controller shall be easily programmable from front panel itself. i) The controller shall be able to recognize the connection of CT and Voltage and be able to

automatically adjust itself to the phase angle difference. j) There should be a time delay of 120 seconds for switching on a capacitor bank into circuit, from its

last disconnection from the circuit. k) The controller shall have LED/LCD display. On/Off status of each bank shall be displayed on the

controller using LEDs. Parameter in display should be cyclic with suitable time delay. Necessary membrane key pad for manual scrolling of display parameter shall be provided. The display unit shall be easily visible without opening the doors of the capacitor bank panel.

l) The controller shall have RS485 and/or RS232 facility for communication.

m) The automatic power factor controller in general shall have the following measurements/displays and

settings.




Measurements/Displays:

i) Current Power Factor and Target Power Factor ii) True RMS line Voltage and Current (VRMS and IRMS) iii) Delta power (Reactive power exceeding or necessary with respect to target PF) iv) Current at fundamental frequency (If0) v) Harmonic current (Iharm) vi) Total harmonic distortion of current in percentage (THDI %) vii) Instantaneous temperature viii) Active power, Reactive power and Apparent power ix) Power of each stage/bank (kvar) x) On/Off status of each stage/bank xi) Software version xii) MAX values encountered for

RMS voltage and current Temperature Active, reactive and apparent power Total harmonic distortion of current %

xiii) Counters preferably for Switching operation of each stage Under voltage Over current and voltage Over temperature Over compensation Under compensation Over THD current

Settings: i) Target power factor ii) Reconnection time delay iii) Current transformer ratio iv) Over temperature limit v) Total harmonic distortion of current (THDI%) limit vi) THDI intervention delay vii) THDI peak limit viii) Ventilation trigger temperature ix) Power (kVAR) for each stage/bank x) Voltage of the capacitor banks xi) Network frequency xii) System mode (2 or 4 quadrants) xiii) Tolerance sensibility to Cos phi regulation xiv) Alarm reset time delay xv) External alarm relay

xvi) Reset of programming xvii) Password




n) The automatic power factor controllers shall initiate alarms and warnings in the following events.

i) Under compensation (Insufficient capacitor output and/or low power factor) ii) Over compensation iii) Over current iv) Under voltage v) Over voltage vi) Over temperature vii) Total harmonic distortion of current (THDI%) limits exceeded.

o) The automatic power factor controllers shall instantaneously switch off the contactor/thyristor in the

following contingencies.

i) Voltage above 457V ii) Voltage below 353V iii) Over temperature iv) Over compensation v) Instances of spike current

Notes : (a) In case of i) to iv) above, normal automatic functioning of the capacitor bank will resume after the

specified values in all these cases are maintained for two minutes.

(b) In case of v) above, the Contactor/thyristor will not switch ON again till the fault condition is attended to.

I) POWER QUALITY METERING:

For electrical installations having installed capacity of 2 MVA and more, a Power Quality (PQ) Meter shall be installed in the Capacitor Bank Panels. A separate power quality meter need not be provided when the automatic power factor (APC) controller incorporates most of the salient features of the power quality meter. Also, provision of a power quality meter is not required for smaller electrical installations having installed capacity of less than 2 MVA. The Power Quality (PQ) Meter shall be a micro-processor based, operating as an intelligent unit to monitor and measure all the electrical parameters of the system. The PQ Meter shall sense and monitor 3 Phase Currents, Neutral Current, 3 Phase Voltages, 3 Phase Power Factors, 3 Phase KW, KVA, KVAR, KW-HR, KVA-HR, KVAR-HR, Capacitance of all 3 phases, Capacitance of each capacitor and % THD. It shall be equipped with LCD display with graphic data display, Real Time Clock (RTC) internal chip for date-time stamping of the events and data logging functionality. 1) Compliance to Standards:

a) The power quality meters shall comply with one or more of the following safety/construction

standards:




i) IEC 61010-1 (EN 61010-1): Safety requirements for electrical equipment for measurement, control and laboratory use.

ii) CSA C22.2 No 1010-1: Canadian Standards Association. Certified by Canadian Standards

Association (CSA).

iii) UL 61010B-1: Measuring, Testing and Signal Generation Equipment

iv) IEC 62052-11: Electricity metering equipment (AC) General requirements, tests and test conditions.

b) The power quality meters shall comply to the following electromagnetic immunity standards:

i) IEC 1000-4-2 (EN61000-4-2/IEC801-2): Electrostatic Discharge (B).

ii) IEC 1000-4-3 (EN61000-4-3/IEC801-3): Radiated EM Field Immunity (A).

iii) IEC 1000-4-4 (EN61000-4-4/IEC801-4): Electric Fast Transient (B).

iv) IEC 1000-4-5 (EN61000-4-5/IEC801-5): Surge Immunity (B).

v) IEC 1000-4-6 (EN61000-4-6/IEC801-6): Conducted Immunity.

vi) IEC 1000-4-12 (EN61000-4-12/IEC801-12): Immunity to damped oscillatory waves.

vii) IEC 1000-3-2 (EN61000-3-2): Limits for harmonic currents emissions (equipment input current < 16 amps per phase).

viii) IEC 1000-3-3 (EN61000-3-3): Limitation of voltage fluctuations and flicker in low voltage

supply systems for equipment with rated current < 16 amps.

c) The power quality meter shall have a 3rd party certification proving compliance to one or more of the following electromagnetic emission standards: i) FCC Part 15 Subpart B, Class A: Class A Digital Device, Radiated Emissions.

ii) ICES-003, Industry Canada, Interference Causing Equipment Standard (ICES) Class A Digital Device, Radiated/Conducted Emissions.

iii) EN55011 (CISPR 11): Radiated/Conducted Emissions (Group 1, Class A).

iv) EN55022 (CISPR 22): Radiated/Conducted Emissions (Class A).

2) Current/Voltage Inputs:

a) The current inputs for power quality meter shall be taken from the current transformer on the LV board.

b) The power quality meter shall have adequate numbers of voltage inputs and current inputs.




c) In its standard configuration, the meter shall be able to accept 500VAC LL / 347VAC LN without using potential transformers.

d) It shall be able to withstand 1500 VAC RMS continuously without damaging the device.

e) It shall have adequate nominal and overcorrect current ratings.

3) Measured Values:

a) The power quality meter shall provide at minimum the following voltage, current, power, power factor and energy values: i) Voltage: LL Per-Phase, L-L 3-Phase Avg., LN Per-Phase, 3-Phase Avg., Voltage

Unbalance Factor ii) Current: Per-Phase, Neutral, 3-Phase Avg., 3-Phase Demand Current (Average over a

programmable integration interval), Maximum 3-Phase Demand Current with date and time. iii) Power: Real, Reactive, Apparent (Per-Phase, 3-Phase Total) iv) Power Factor: True & Displacement (Per-Phase, 3-Phase Total) v) Energy: Accumulated, Incremental, Conditional (kWh, kVARh, kVAh) (Signed/Absolute)

b) The power quality meter shall provide a minimum/maximum value for any measured parameter.

c) The power quality meter shall be capable of deriving values for any combination of measured or calculated parameter, using the following arithmetic, trigonometric, and logic functions ( or equivalent PLC capabilities):

i) Arithmetic functions: division, multiplication, addition, subtraction, power, absolute value, square root, average, max, min, RMS, sum, sum-of-squares, unary minus, integer ceiling, integer floor, modulus, exponent, PI.

ii) Trigonometric functions: COS, SIN, TAN, ARCCOS, ARCSIN, ARCTAN, LN, LOG10 iii) Logic functions: =, =>,




5) Sampling:

a) The power quality meter shall sample at 128 samples/cycle.

b) The meter shall be able to perform high speed sag/swell detection of voltage disturbances on a half-cycle-by-half-cycle basis, providing the duration of the disturbance, the minimum, maximum, and average value of the voltage for each phase during the disturbance. Disturbances less than one cycle in duration can be detected.

6) Display:

a) The power quality meter shall have a LCD display of reasonably high level pixel value.

b) It shall support direct display of all parameters on the front panel.

c) It shall provide a trend display of any parameter internally recorded at regular intervals.

d) It shall have a user programmable custom display that is capable of displaying up to 20 quantities on a single screen.

e) It shall be able to display advanced graphical representations of metering information including at minimum spectral components, phasor diagrams, and trending charts.

f) It shall be able to display measurements in either IEC or IEEE formats.

g) It shall be able to display the following front panel screens:

i) Numeric: Display 2, 3, 3 with timestamp, 4, 8, 10 or 20 parameters at a time.

ii) Event Log: Display recent events written to the power quality meters event log, including diagnostic events.

iii) Nameplate: Display information in a tabular format (default nameplates show owner, meter and power system details).

iv) Trend Bar: Display up to 4 real time numeric parameters along with their upper and lower extremes.

v) Histogram: Display harmonics content in histogram format, including 2nd to 32nd harmonic, THD (total, even, odd); current harmonics histogram screens display K Factor and Crest Factor.

vi) Phasor: Display phase information in phasor diagram format, including phase, voltage and current magnitudes; phasors that are too small in magnitude are shown as table entries only.

7) Logging:

a) The power quality meter shall have at least 5MB of user programmable onboard data logging.

Field Expansion shall be possible.




b) The PMS will store all critical internal and revenue data upon sudden power loss.

c) The meter shall have non-volatile memory.

d) It shall have a time-stamped event log with the following features:

i) Supports at least 500 events.

ii) The number of records in the log is programmable.

iii) Each event is recorded with the date and time of the event, the cause and effect of the event, and the priority of the event.

iv) All events relating to set-point activity, relay operation and self-diagnostics is recorded in the

event log.

v) Time stamps have a resolution of 1 millisecond.

vi) Time stamps can be synchronized to within 100 ms between devices on the same serial communications medium.

vii) Minimum event recording response time is cycle (8.3ms 60Hz, 10ms 50Hz) for high speed

events and 1 second for other events.

viii) The priority of set-point events is programmable.

e) The power quality meter shall be able to log any parameter in the meter including min/max and waveforms.

8) Alarming:

a) The power quality meter shall have set-point driven alarming capability

b) It shall be able to generate an email on an alarm condition.

c) It shall have millisecond timestamp resolution on alarm entries.

d) It shall be able to readjust alarm set-points based on the alarm quantity (Alarm Set-point Learning)

e) It shall support consecutive high-speed alarm conditions which trigger on a cycle-by-cycle basis

with no dead time between events (i.e. no need for a rearming delay time between events). f) It shall be able to operate relays on alarm conditions.

g) It shall be able to initiate datalog captures on alarm conditions.

h) It shall be able to control digital output relays in an AND or an OR configuration, using pulse mode

or latch mode operation, for control and alarm purposes.




i) It shall be able to combine any logical combination of any number of available set-point conditions to control any internal or external function or event.

J) REMOTE COMMUNICATION MODULE: A remote communication module shall be provided for all capacitor banks in electrical installations having installed capacity of 2 MVA and more in order that data to ensure capacitor banks are operational and in healthy condition in addition to all essential data related to the power quality including power factor, harmonic current, total harmonic distortions, etc. can be transferred to the Ministry of Electricity & Waters Control Room Server for monitoring purposes through interface with the automatic power factor controller and/or the power quality meter.

a) The remote communication module shall be an integral of the capacitor bank or an independent unit,

housed in a separate protective enclosure and installed at a suitable location in the LT/Electrical room.

b) It shall have facility to accept data from RS485/RS232 port to be able to interface with the APF

controller and/or the PQ meter. c) It shall communicate on Modbus RTU or Modbus TCP/IP protocol or the capacitor bank

manufacturer shall provide suitable gateway to convert to one of these protocols. d) It shall be able to process data from different capacitor banks in case more than one capacitor bank

is installed at a particular site and shall have configurable identification for each bank to sort data accordingly.

e) It shall have remote communication/data transfer facility using GPRS Modem and update data at

required intervals i.e. hourly, daily, weekly or monthly as programmed and on demand. All operational costs for data transfer including the SIM shall be borne by the Owner.

f) It shall have two way communication and onsite and remote programming features. g) It shall have configurable transmission parameters and shall be able to send SMS in case of faults. h) It shall have temperature sensor and facility for continuous measurement of room temperature.

i) It shall have necessary battery backup to report in case of power failure.

K) CAPACITOR BANK PANEL:

The capacitor bank comprising of capacitor units, series reactors, automatic power factor controller, power quality meter, electro-magnetic and/or thyristor switched contactors, switch-disconnector, MCCBs, MCBs, etc. shall be housed in a suitable metallic enclosure having a front door with a provision for locking arrangement. a) The capacitor bank panels shall not be an integral part of the main or sub-main distribution boards,

shall be isolated and free-standing type and installed adjacent or close to the main or sub-main distribution boards.




b) The capacitor bank panels shall be ample dimensioned and components like capacitors, series reactors, fuses, thyristors, etc. which produce significant amount of heat shall have adequate clearances between them.

c) The enclosures of the capacitor bank panels shall be fabricated from pre hot dip galvanized sheet

steel of minimum thickness 2 mm. and having a zinc coating thickness of 275 gm/sq.mm. (38.5 microns). Alternatively, Alu-zinc coated steel having a coating thickness of minimum 25 microns shall be used for the enclosures.

d) The capacitor bank panels shall be forced ventilated with suitably sized exhaust fans.

e) The general arrangement of the capacitor bank panel can be made in sections, which can be

arranged in separate compartments or in a single configuration. In case of separate compartments, these shall generally comprise of:

i) Bus-bar, main connection and/or main isolation; ii) Capacitor bank fuses or circuit-breakers and/or contactors; iii) Reactors for harmonic control purposes; iv) Capacitors; v) Control fuses, terminals and controller.

f) The degree of protection of the enclosures shall be minimum IP21 in accordance with IEC-60529.

The compartment door(s) shall be fitted by robust weather-proof stainless steel hinges and shall have suitable locking devices.

g) Each item on the front panel of the capacitor banks shall have a proper label of adequate

dimensions. These labels shall be made of suitable and approved engraving material approximately 2 mm. thick having white surface with black engraving. Alternative design of labels can be proposed subject to Purchasers approval.

h) All other labels shall be from similar material and engraved in English. Full details and locations of all

labels shall be indicated on the drawings and shall be subject to approval of the Purchaser. i) All fixing screws for the different components shall be from stainless steel of adequate size.

j) The capacitor bank enclosure after fabrication shall be applied with a two-component polyamide

cured zinc-rich epoxy primer (Hempadure Zinc 15360 or equivalent) to a dry film thickness coating of minimum 40 microns and then with a final coat of paint by using electrostatic dry powder epoxy polyester method of painting to a film thickness of 80 microns.

k) Each capacitor bank panel shall be provided with a 200 mm. x 150 mm. electrical danger sign of

approved type from non-corrosive metal plate, which shall be fixed on the outside of the right hand side door of the panel.

l) Substantial brass or stainless steel diagram and rating plates shall be provided on the capacitor bank

giving the following information as a minimum:




Capacitor Bank Rating Plate:

i) Manufacturers name & country of origin. ii) Serial number and type/model. iii) Date of manufacture. iv) Rated reactive power in kilovars (KVAR) / Number of switchable Capacitors with capacity v) Rated voltage in volts (V). vi) Rated frequency in hertz (Hz). vii) Minimum and maximum ambient temperatures in degrees Celsius (oC). viii) Degree of protection ix) Short circuit withstand strength in Amperes (A)

L) INTERNAL WIRING:

All small wiring within the capacitor banks shall be from 600/1000 volts grade, 2.5 sq. mm. single core cables insulated with Type-TI3 PVC as per Table 1, BS EN 50363-3:2005 or XLPE insulated and shall have stranded copper conductors. All wiring shall be suitably terminated and fitted with identification ferrules and marked with circuit numbers in accordance with British Central Electricity Authority Engineering Recommendations S-12 standard numbers for small wiring or similar approved standard. The trip circuits shall have an additional ferrule coloured red and marked trip. All terminal blocks shall be from an approved design and all exposed terminals shall be enclosed by detachable covers. The trip circuit cables shall be coloured black and the instrument transformer cables (C.Ts) coloured with their respective phase colours. Alternatively, all small wiring can be uniform colour (e.g., grey) but instrument transformer cables shall have additional coloured ferrules at both ends of each conductor run (in accordance with their phase colours). The wiring of the auxiliary circuits shall be segregated from the main circuit by heat resistant tubes made of insulating material covered by earthed metallic partitions. Terminal blocks, small wiring terminations, ferrules and wire numbering and colouring shall be subject to the approval of the Purchaser.

M) PROVISION OF CIRCUIT BREAKERS AND CONTROL CTS IN THE LV DISTRIBUTION BOARDS FOR POWER SUPPPLY CONNECTION TO THE CAPACITOR BANKS

It will be the consumers/owners and/or their consultants/contractors responsibility to ensure that necessary circuit breaker and control current transformers (CTs) are provided and installed in the low voltage distribution boards of the power distribution system so that the capacitor banks and controls can be connected to the system.

1. Circuit Breakers:

Moulded case circuit breakers (MCCBs) inside the LV Boards to feed the capacitor banks shall be provided and installed by the LV Board manufacturer. The circuit breaker shall be a three pole




moulded case circuit breaker (MCCB), shall fully comply with the requirements of the IEC 60947-1 & 2 and shall be set to trip at 1.3 times the rated current of the capacitor bank. The rated insulation voltage of the MCCB shall be mimimum 660 V and it shall be designed for continuous operation in ambient temperatures of up to 52oC or shall be derated accordingly. The current rating shall be at least 1.5 times the full load current of the capacitor bank and it shall have mechanical endurance of a minimum 1000 operations. It shall have a rotary front operating door mounted handle and should be interlocked with the door to ensure that the capacitor bank is de-energised when door is open.

2. Current Transformers:

Three (3) numbers of current transformers for sensing the load current (for computation of KVAR) shall be provided and installed by the LV Board manufacturer. The CTs shall be mounted on the bus-bars of the LV Boards. The control CTs shall be suitable for continuous operation in ambient temperatures of up to 52 Deg. C. The primary current rating shall be suitable for the transformer full load current and secondary rating shall be 5 amp or shall match the automatic power factor controller and/or power quality meter requirements. These should be epoxy molded resin cast CTs with bar primary. The inner diameter should be suitable for connecting it around the bus-bar of the LV Boards. The VA rating of the CTs shall not be less than 5 VA. The CTs shall be of 0.5S class accuracy and shall have the current sensing linearity in the specified accuracy range from 1% to 120% of its rated current. The terminations for the CTs shall have the provision to short the CTs.




IV - INSTALLATION OF CAPACITOR BANKS

The installation of the capacitor bank shall be generally in accordance with manufacturer's recommendations. Clearance shall be provided around the capacitor bank for safety and adequate ventilation. The design of the capacitor banks must be as to facilitate easy alignment and erection on the site. Provision of proper earthing of the metallic enclosure of the capacitor bank shall be made. The capacitor banks at the Main LV Distribution Boards and Sub-main Distribution Boards shall be connected to the earth ring bus by 1000 Volts grade cables of adequate cross-sections. The capacitor bank at the service intake of the consumers shall have an earthing system consisting of a set of two (2) Nos. 1.5 metres (to make a 3.0 metres long rod) x 19 mm dia. copper bonded earth rods and connected by 1000 Volts grade insulated cable of 70 sq. mm.. The earth rods are to be installed inside pre-cast hand holes of 30 cm. x 30 cm. clear opening and a depth of 55 cm. provided with a heavy duty concrete cover to enable checking of the connection and measurement of the earth resistance.

The testing and commissioning of the capacitor banks shall always be carried out by qualified and trained manufacturers and/or local agents engineer/specialist in full compliance with the specification.




V - TESTS

A) GENERAL:

The supplier/manufacturer/contractor of the capacitor banks shall carry out the tests specified in any applicable International Electro-technical Commission (IEC) and/or British Standard (BS) Specifications, unless otherwise agreed upon and such additional tests as in the opinion of the Purchaser or his representative are necessary to determine that the works comply with the conditions of this specification. All instrument used for testing purposes, shall be calibrated by an approved authority and calibration certificates shall be submitted along with the inspection reports. The test results/readings recorded during measurements and other observations noted shall be compiled/tabulated separately for each item of equipment and furnished to the Purchaser in a fully professional manner in three (3) complete sets. Electronic copies of the reports shall also be submitted in three (3) complete sets of compact disks (CDs).

B) TYPE TESTS:

The supplier/manufacturer/contractor of the capacitor banks shall submit complete type test certificates and reports from an internationally recognized independent testing laboratory (ASTA, KEMA or CESI) for the capacitor banks of the specified design, construction and rating. The certificates and reports shall not be older than five (5) years. The following type tests shall be carried out as indicated against each equipment:

1. Individual Capacitor Units:

All type tests shall be carried out in an internationally recognized independent testing laboratory (ASTA, KEMA or CESI) at their laboratory of country of origin in accordance with the International Electro-technical Commission (IEC) Publication No. IEC 60831 as per the relevant clauses mentioned against each test. Every capacitor sample to which it is intended to apply the type test shall first have withstood satisfactorily the application of all the routine tests.

i) Thermal stability test (Cl.13).

ii) Measurement of the tangent of the loss angle (tan ) of the capacitor at elevated temperature (Cl. 14).

iii) Voltage test between terminals (Cl. 9.2)

iv) Voltage test between terminals and container (Cl. 10.2).

v) Lightning impulse voltage test between terminals and container (Cl. 15).

vi) Discharge test (Cl. 16).




vii) Ageing test (Cl. 17). (See Notes below)

viii) Self-healing test (Cl. 18).

ix) Destruction test (Cl. 19).

Notes: 1. The temperature of the case during the ageing test shall be the maximum ambient

temperature i.e., 55oC plus the difference between the measured temperature of the case and the cooling air temperature recorded at the end of the thermal stability test carried out on an identical unit.

2. After placing the capacitor in the unheated enclosure, the thermostat shall be set at a

temperature equal to that as above.

2. Complete Capacitor Banks:

All type tests shall be carried out in an internationally recognized independent testing laboratory (ASTA, KEMA or CESI) at their laboratory of country of origin in accordance with the latest issues of the International Electro-technical Commission (IEC) Publication Nos. IEC 61921 and IEC 61439-1. Design Verification Tests: Design verification tests shall be carried out as per IEC 61439-1 to relevant clauses as mentioned against each test and shall comprise the following:

1. Construction:

i) Strength of materials and parts tests (Cl. 10.2). ii) Degree of protection test for enclosures (Cl 10.3).

iii) Clearances and creepage distances (Cl. 10.4).

iv) Protection against electric shock and integrity of protective circuits (Cl. 10.5). v) Incorporation of switching devices and components (Cl. 10.6). vi) Internal electrical circuits and connections (Cl. 10.7).

vii) Terminals for external conductors (Cl. 10.8).

2. Performance:

i) Dielectric properties (Cl. 10.9).




ii) Temperature rise (Cl. 10.10.2) (See Notes below)

iii) Short-circuit withstand strength (Cl. 10.11).

iv) Electromagnetic compatibility (Cl. 10.12).

v) Mechanical operation (Cl. 10.13). Notes:

1. The temperature rise test shall be carried out by the method of verification by testing current at an ambient temperature of 52oC with all capacitor units, detuned series reactors and other components assembled and connected and injecting full load current.

2. Conditions of Cl. 7.2.1 of IEC 61921 shall apply.

3. Disconnectors, Series Reactors, Thyristors, Electro-magnetic Contactor, Current Transformers:

Complete type test certificates for all major components, like MCCBs, Series Reactors, Thyristors, Electro-magnetic Contactor, Current Transformers, etc. shall be submitted as per the relevant IEC/BS specifications.

4. Low Voltage Cables:

All type tests shall be carried out in accordance with the latest IEC Publication No. 60502-1 and supplements.

C) ROUTINE TESTS:

All routine tests shall be carried out in accordance with the relevant IEC/BS specifications. Routine test results shall be produced and must be available at the time of delivery of the equipment.

1. Individual Capacitor Units:

All routine tests shall be carried out in accordance with the International Electro-technical Commission (IEC) Publication No. IEC 60831 as per the relevant clauses mentioned against each test. Routine tests shall be carried out by the manufacturer on every capacitor before delivery.

i) Capacitance measurement and output calculation (Cl. 7).

ii) Measurement of the tangent of the loss angle (tan ) of the capacitor (Cl. 8).

iii) Voltage test between terminals (Cl. 9.1).

iv) Voltage test between terminals and container (Cl.10.1).




v) Test of the internal discharge device (Cl. 11).

vi) Sealing test (Cl. 12).

2. Complete Capacitor Banks:

All routine tests shall be carried out in accordance with the latest issues of the International Electro-technical Commission (IEC) Publication Nos. IEC 61921 and IEC 61439-1. Routine tests shall be carried out by the manufacturer on every capacitor bank before delivery.

Routine VerificationTests:

Routine verification tests shall be carried out as per IEC 61439-1 to relevant clauses as mentioned against each test and shall comprise the following: 1. Construction:

i) Clearances and creepage distances (Cl. 11.3).

ii) Protection against electric shock and integrity of protective circuits (Cl. 11.4).

iii) Incorporation of built-in components (Cl. 11.5).

iv) Internal electrical circuits and connections (Cl. 11.6).

v) Terminals for external conductors (Cl. 11.7).

vi) Mechanical Operation (Cl. 11.8).

2. Performance:

i) Dielectric properties (Cl. 11.9).

ii) Wiring, operational performance and function (Cl. 11.10).

A functional test of the complete capacitor bank control, protection and interlocking schemes shall be carried out in the factory. These shall include secondary injection tests on the protection relays.

D) SITE TESTS:

All site tests shall be carried out by qualified and trained manufacturers and/or local agents engineer/specialist in the presence of and to the satisfaction of the Purchaser or his representative. The following site tests/inspection shall be carried out prior to energizing the capacitor banks:




1. Mechanical Tests:

a) Checking of panel conformity to drawing and Engineers requirements.

b) Checking of all devices for proper mounting and all conductors and cables for proper routing.

c) Checking of creepage and clearance distances.

d) Checking effectiveness of all mechanical devices, e.g. handles, locks, interlocks, operating devices, etc.

e) Checking of all electrical connections for tightness/surface area contacts. f) Checking of Labels, Identifications, Nameplates, Danger Signs, etc.. g) Checking of installation works of capacitor banks and cabling, earthing, etc.. h) Checking of capacitor bank enclosure for overall workmanship and smooth finish.

2. Electrical Tests:

a) Insulation resistance measurements on the buses, phase to phase and phase to ground, with all breakers in the fully connected position and contacts open. Insulation resistance shall exceed 10 megaohms.

b) Control circuit insulation resistance to ground.

c) Flash test all main circuit at 2.5 kV for one minute. Leakage current shall be measured and

recorded.

d) Repeat insulation resistance measurements to verify the same has not been affected by the dielectric test.

e) Primary and secondary injection tests of all relays, CTs and indicating and metering instruments.

3. Functional Tests:

a) Functional test of all circuit breakers, switches, contactors, relays, etc. and every circuit to verify correct operation.

b) Operate the equipment through all design functions, including remote operation, actuation of

alarm and indicating devices, mechanical and electrical tripping and closing, and operation of the protective devices.

c) Inspect all relays and protective devices, and verify settings in accordance with the

manufacturers instructions.




d) Inspect current transformers and relays for correct polarity of connections and the installation of jumpers on unused current transformer circuits.

e) Simulate the operations and check the logic of interlocks.

f) Manually close and trip each breaker checking and adjusting the main contact alignment and

wiring action in accordance with the manufacturers instructions. g) Check the phasing on each side tie breaker, before closing.

h) Test protective relay operation for incomer circuit breakers.

i) Measurement of the power factor and system harmonics before and after commissioning of the

capacitor bank

j) Data communication.




VI - GUARANTEES

The supplier/manufacturer/contractor of the capacitor banks shall submit the following guarantees:

i) Guarantee that all the capacitor banks and all parts and components thereof like, capacitor units,

series reactors, thyristor switched contactors, electromagnetic contactors, power factor controllers, power quality meters, current transformers, switch-disconnectors, MCCBs, Fuses, thermal magnetic overcurrent relays, etc., will give continuous trouble free service at Kuwaits extreme ambient temperature (520C) and weather conditions (100% RH), and any capacitor bank and/or any parts/components thereof that will fail, malfunction or burn out within a period of three (3) years will be replaced and reinstalled free of charge.

ii) The supplier/manufacturer/contractor shall further guarantee fully satisfactory operation and running of the entire equipment for a period of three (3) years from the date of commissioning.

Note: The above guarantees shall be submitted by the manufacturer and/or local agent on their original letterhead indicating the serial number of the capacitor bank(s) duly signed and stamped by the manufacturer and/or local agent and the contractor.




APPENDIX - 1

LIST OF APPROVED MANUFACTURERS FOR CAPACITOR BANKS

The Manufacturer of LV Capacitor Banks shall be one of the following:-

1 ABB n.v. Belgium

2 Schneider Electric France

3 Areva T & D SA France

4 Janitza Electronics GmbH Germany

5 Eaton (Cutler Hammer) USA

6 Comar Condensatori Italy

7 ICAR Spa Italy

Notes :

1. An up-to-date list of approved manufacturers may be obtained from the Electrical Distribution Networks Department of the Ministry of Electricity & Water, Kuwait, through a written request.

Documents

LV Capacitor Bank Specs. January 2011