DVCAS - s; E

DVCAS GIS cubicles

for renewable transformer substations

Up to 36/38 kV

Medium Voltage Distribution

WLW03855P01-EN

11/18 Ind: A0

schneider-electric.com

Instruction Manual

Instruction Manual WLW03855P01-EN 11/18 Ind: A0

Legal Information

The Schneider Electric brand and any registered trademarks of Schneider Electric Industries SAS referred to in this guide are the sole property of Schneider Electric SA and its subsidiaries. They may not be used for any purpose without the owner’s permission, given in writing. This guide and its content are protected, within the meaning of the French intellectual property code (Code de la propriété intellectuelle français, referred to hereafter as “the Code”), under the laws of copyright covering texts, drawings and models, as well as by trademark law. You agree not to reproduce, other than for your own personal, noncommercial use as defined in the Code, all or part of this guide on any medium whatsoever without Schneider Electric’s permission, given in writing. You also agree not to establish any hypertext links to this guide or its content. Schneider Electric does not grant any right or license for the personal and noncommercial use of the guide or its content, except for a non-exclusive license to consult it on an “as is” basis, at your own risk. All other rights are reserved.

Electrical equipment should be installed, operated, serviced and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.

As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.


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INDEX

REMARKS ON THIS MANUAL ................................................................................................................ 4 SAFETY INFORMATION ......................................................................................................................... 5 1. SAFETY PROVISIONS ........................................................................................................................ 6 2. CHARACTERISTICS AND APPLICATIONS........................................................................................ 9

2.1 SERVICE CONDITIONS ................................................................................................................ 9 2.2 DESCRIPTION ............................................................................................................................... 11 2.3 PANEL DESCRIPTION .................................................................................................................. 15 2.4 APPLICABLE STANDARDS .......................................................................................................... 16 2.5 TECHNICAL FEATURES ............................................................................................................... 16

3. HANDLING, TRANSPORT AND STORAGE........................................................................................ 18 3.1 DIMENSIONS AND WEIGTHS ...................................................................................................... 18 3.2 SUPPLY, PACKING AND TRANSPORT ....................................................................................... 19 3.3 DELIVERY ...................................................................................................................................... 20 3.4 HANDLING AND UNPACKING ...................................................................................................... 21 3.5 STORAGE ...................................................................................................................................... 21

4. ERECTION ............................................................................................................................................ 22 4.1 GENERAL CONDITIONS ............................................................................................................... 22 4.2 MOUNTING .................................................................................................................................... 22 4.3 CONNECTION ............................................................................................................................... 23

5. OPERATING INSTRUCTIONS ............................................................................................................ 26 5.1 SWITCH-DISCONNECTOR AND EARTHING SWITCH OPERATIONS ...................................... 27 5.2 CIRCUIT BREAKER PANEL OPERATIONS ................................................................................. 30 5.3 INTERLOCKS ................................................................................................................................. 34 5.4 VOLTAGE PRESENCE INDICATION AND PHASES CONCORDANCE ...................................... 36 5.5 CABLE TESTS ............................................................................................................................... 38 5.6 GAS CHECK .................................................................................................................................. 39 5.7 COMMISSIONING .......................................................................................................................... 40

6. MAINTENANCE .................................................................................................................................... 41 6.1 INTERVENTION LEVELS .............................................................................................................. 43 6.2 CONTROL MECHANISM ............................................................................................................... 43 6.3 LOW VOLTAGE AUXILIARY CIRCUITS ....................................................................................... 44 6.4 POWER CIRCUIT .......................................................................................................................... 45 6.5 MAINTENANCE PROGRAM .......................................................................................................... 46

7. ANNEX .................................................................................................................................................. 47 7.1 DEVICES AND EQUIPMENT ......................................................................................................... 47


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Remarks on this manual

As our products are subject to continuous further development, we reserve the right to make changes regarding the standards, illustrations and technical data. All dimensions specified in this manual are in millimeters.

Purpose and target group This Technical Manual describes operation and maintenance of gas-insulated medium- voltage switchgear units of the DVCAS series. It is exclusively for manufacturer's staff use, or by persons trained for the DVCAS series. Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material. This Technical Manual is an integral part of the product and must be stored so that it is readily accessible at all times for and can be used by persons who are to work on the switchgear. If the switchgear is relocated to another site, this Technical Manual must be passed on to the new operators along with the unit. This Technical Manual cannot describe every imaginable individual case or every customer-specific version of the product. For information which is not included in this manual, please contact the manufacturer.

Reference documents The following additional documents must be complied with:

• Purchase agreement with the stipulations regarding the

switchgear-specific equipment and the legal details the appropriate switchgear-specific circuit diagrams / documentation

• The Operating Manuals of the devices installed in the switchgear • The Assembly Instructions of the manufacturer of the cable connection

systems to be connected to the switchgear • The assembly drawings supplied with the equipment • Product Environmental Profile - PEP • Product End-of-Life Instructions


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Safety information The following special messages may appear throughout this manual or on the equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

The addition of this symbol to a “Danger” or “Warning” safety label indicates that an electrical hazard exists which will result in personal injury if the instructions not followed.

• Please note

Electrical equipment should be installed, operated, serviced and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.

A qualified person is one who has skills and knowledges related to the construction and operation of electrical equipment and its installation, and has received safety training to recognize and avoid the hazards involved.

WARNING indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

WARNING

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

CAUTION

NOTICE NOTICE is used to adress practices not related to physical injury.

DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.

DANGER


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1.SAFETY PROVISIONS Before performing work on the panel, it is essential that you comply with the following instructions:

RISK OF INJURY DUE TO MOVABLE PARTS IN MECHANICAL DRIVES

Before performing mounting and maintenance work:

• Isolate the system from supply voltage • Release the circuit breaker energy storing device by ON-OFF-ON operation • Switch make-proof earthing switches ON • Do not remove mechanism during maintenance work.

Failure to follow these instructions will result in death or serious injury.

WARNING

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

• Before removing covers and before performing assembly or maintenance work, make sure that you isolate the system from the high voltage and the supply voltage and that you ground it.

• Comply with the five safety rules

• Isolate from the power supply • Make sure that the unintentional restart (reclosing) is prevented • Verify zero voltage • Earth and short-circuit • Cover or cordon off adjacent live components.


RISK OF SEVERE DAMAGE FROM INSULATING GAS LEAKAGE

• Do not drill into or open the pressurized container.

Failure to follow these instructions can result in death or serious injury.

WARNING


7

For the equipment described in this manual and or in its vicinity, paragraph 11.2 of IEC 62271-1:2017 standard will be followed, and only properly trained and/or supervised personnel is considered (as per EN 50110-1, EN 50110-2. IEC 61936-1 / EN 50522). Keep the national standards applicable in the country where the equipment is to be installed. Personnel must be fully familiar with the instructions and warnings contained in the manual and also with those of a general order which are applicable in accordance with the legislation in force (Occupational Hazards Prevention Law and, as it may be appropriate, the General Health and Safety Ordinance). All the aforementioned has to be seriously taken into account as the correct operation of this unit depends not only on its design but also on circumstances beyond the control and responsibility of the manufacturer, as may be:

• Appropriate transport and handling on the way from the

manufacturing plant to the installation site. • Any intermediate storage made under conditions which do

not alter and/or damage the characteristics of the unit or any of its basic parts.

• Installation carried out according to the instructions given in this manual and the rules of sound practice.

• Service conditions compatible with the rated characteristics of the equipment.

RISK OF INJURY DUE TO SHARP-EDGED SHEETMETAL AND METAL PARTS During installation and maintenance work:

• Always wear the approved protective clothing in accordance with the valid accident prevention and work regulations

• Always cover sharp edges.

Failure to follow these instructions can result in injury.

CAUTION

RISK OF FALLING DURING MAINTENANCE WORK The topsides of the switchgear panels cannot be walked upon:

• Pay attention to cracks or holes in the floor of the switchgear room • When working on the topside of the switchgear panels temporarily attach a

mounting frame that can be walked upon. Secure the workplace when working on switchgear panels.


WARNING


8

• Handling and service operations strictly according to the instructions given in the manual, showing a clear understanding of the operating and safety principles involved.

• Appropriate maintenance for the real service conditions. • End of life treatment carried out according to the

instruction manual and in accordance with the legislation in force at the time.

For this reason, the manufacturer will not be responsible of any direct or indirect damage resulting from any breach of the warranty or of the aforementioned instructions, under any jurisdiction including personal injuries or good damages, non-profits, periods of inactivity time, cost of repair or replacement of materials. Recycling your equipment at end-of-life This equipment contains SF6, a powerful greenhouse gas that is harmful to the environment. Prior to disposal of equipment at end of life, the SF6 gas must be recovered in order for it to be recycled, reclaimed or destroyed. DO NOT carry out any dismantling operations unless authorized. DO NOT handle SF6 unless certified. DO NOT release SF6 gas to the atmosphere. Penalties may apply according to local regulations and rules (Regulation EU No 517/2014 for all European countries). Schneider Electric offers a complete service to dismantle and recycle Medium Voltage equipment and SF6 gas at the end-of-life. This service is compliant with IEC 62271-4:2013 and conforms to local regulations. Please contact Schneider Electric for details. SF6 is a powerful greenhouse gas having a Global Warming Potential of 22800 compared to CO2 (in accordance with the 4th IPCC assessment report and annex I of EU regulation on fluorinated gases 517/2014) Registered Trademarks and Copyright All names of registered trademarks referred to in this document are the property of their respective owners. The intellectual property of this manual belongs to the manufacturer.


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2. CHARACTERISTICS AND APLICATIONS

2.1. SERVICE CONDITIONS SF6 insulated, shielded, Medium Voltage switchgears, type DVCAS, are metal-enclosed, prefabricated for indoor installations and according to the applicable national and international standards. DVCAS distribution switchgear has been designed and manufactured in accordance with the latest technological innovations and complying with the most demanding requirements as far as service reliability and availability are concerned. The reliability and life of the switchgears depend on their correct application, as specified on the instructions, and proper maintenance. Hence the importance of observing the instructions contained in the present manual. DVCAS is intended to be used in accordance with its rated characteristics and the normal service conditions (class -5ºC, indoor) listed in IEC 62271-1:2017. • Maximum temperature: 40º C and minimum: up to –25º C, the

average value being less than 35º C over a 24 h. period.

• Altitude under 1000 m. Please consult for other altitudes.

• Humidity conditions: - Average relative humidity less than 95%, over a 24 h

period. - Average steam pressure less than 2.2 kPa, over a 24 h

period. - Average relative humidity less than 90%, over a period of

one month. - Average steam pressure less than 1.8 kPa, over a period

of one month.

Any other use could affect the performance qualities of the unit. Therefore, before starting with its handling and installation, it is essential to read and understand this manual. Also, installation and service should be carried out by appropriately trained personnel. The manufacturer will accept no liability for any consequence which may be derived from the non-compliance with the instructions of this manual or any operation which is not described in this manual. Should any operation of this kind be carried out, it is advisable to inform us first. Comply the described operations with the current safety regulations applicable to the location and be carried out under the responsibility of a qualified person appointed by the client. As a result of product development, certain characteristics of the unit may not exactly correspond to the information given in this


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document. If in doubt, please do not hesitate to contact us using the contact details at the end of this manual.


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2.2. DESCRIPTION DVCAS is a SF6-insulated, prefabricated MV switchgear that is compact and especially, but not exclusively, suitable for installation in LV/MV transformer substations in wind farms. Each cubicle comprises of a stainless steel, gas-tight enclosure which uses SF6 gas as insulating medium which houses the busbar system and the switching devices. Each cubicle is extensible which allows the most common functional groups in wind farms to be built. Functional modular units, include:

• Transformer protection unit: including vacuum circuit breaker and three position disconnector-earth selector. This is referred to as a D function.

• Line switch sectionalising unit: including three position switch-disconnector (ON - OFF - EARTHED). This is referred to as an I function.

• Direct busbar connection unit. This is referred to as an O function.

METALLIC TANK The metal tank is made of a stainless steel sheet and includes welded bushings for power cables plug-in connections. The tank is sealed-for life type, as per IEC 62271-200:2011. The special design of all elements that are going to be welded to withstand strains caused by heat, an appropriate welding process and robust mechanical bushings, are factors that make up a hermetic and solid unit, which can easily withstand the mechanical stresses derived from handling and service.


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- SWITCH – DISCONNECTOR The switch disconnector is a three position type: ON – OFF – EARTH SELECTED. This has a short-circuit making capacity for both switch - disconnector and cable earthing operations.

- CIRCUIT BREAKER

The circuit breaker is a vacuum circuit breaker type. It is placed inside the tank and is E2 M1 class as per IEC 62271-100:2008 standard, with a rated operated sequence O-0.3s-CO-15s-CO. The circuit breaker can be operated locally with the mechanical pushbuttons situated on the front panel of the switchgear. The operating mechanism can be manual or motorized, and is provided by a spring system that stores energy. The closing spring can be manually charged with the CB handle supplied with the unit. In the case of MOTORISED OPERATING MECHANISMs, the closing spring is charged automatically after each connection operation as soon as the auxiliary voltage is applied to it.

DVCAS19041201

DVCAS16030100


13

- CONNECTION Before connecting the circuit-breaker, remove the operating handle of the manual operating mechanism of the switchgear disconnectors and turn the selector to position "0". Push the "I" mechanical pushbutton or from remote, operate the voltage of the closing release. Then, the "I" closed position indication in the synoptical scheme appears on the inspection window, disappearing the indication of spring charged. Immediately, the motor operated mechanism charges automatically the stored-energy spring. - DISCONNECTION

Operate the "0" mechanical pushbutton or from remote, operate the electrical signal of the tripping coil. Then, the inspection window indicates a non established position indicating an open line in the synoptic. If the Power circuit-breaker has been used to earth the circuit, the electrical opening signals do not work.

- THREE POSITION DISCONNECTOR The 3 position disconnector-earth selector is fitted in the same compartment as the circuit-breaker. The three positions are:

• connected to busbars • open • earthed

It is manually operated by a removable handle in the front panel. Earthing switch making capacity is assured by the circuit breaker.

DVCAS16030101

DVCAS16031501

DVCAS16031502


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- CABLE COMPARTMENT Cable compartments are front access and are suitable for fitting a double connector arrangement when required. A transformer protection cubicle usually includes a lateral cable compartment that allows the connection of a MV cable directly to the busbar. Cable box covers are interlocked with the earth switch to prevent access until the cable earth is applied. O function busbar cable box covers can be fitted with optional key interlocks to prevent access until the cable has been earthed elsewhere. Cubicles are provided with type C profile bushings as per EN 50181, suitable for connecting shielded connectors, manufactured according to the same standard.

DVCAS13030602


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2.3. PANEL DESCRIPTION

DVCAS19041101

1. Stainless steel tank

2. SF6 gas

3. Busbar system

4. Three-positions switch-disconnector

5. Circuit breaker

6. Line cables connections

7. Cable connections to transformer

8. Pressure relief device

9. Access panel to line cables

10. Access panel to transformer cables

11. Operating mechanism panel (line)

12. Operating mechanism panel (transformer)

13. Interlocking system of access to cables (line)

14. Interlocking system of access to cables (transformer)

15. Earth conductor

16. Circuit breaker pushbuttons

17. Pressure gauge

18. Nameplate

19. Voltage presence indicator

20. Individual unit transport ringbolts

21. Cable clamp

22. LV cover

23. Lateral cable compartment (riser)

24. Lateral connections (cable riser)

25. Metal frame.

26. Gas exhaustion duct


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2.4. APPLICABLE STANDARDS

IEC 62271-1 (2017) High-voltage switchgear and controlgear. Common specifications.

IEC 62271-200 (2011)

High-voltage switchgear and controlgear. AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV.

IEC 62271-102 (2003-2018)

High-voltage switchgear and controlgear. High-voltage alternating current disconnectors and earthing switches.

IEC 62271-100 (2008 A1:2012)

High-voltage switchgear and controlgear. High-voltage alternating current circuit-breakers.

IEC 62271-103 (2011)

High-voltage switchgear and controlgear. Switches for rated voltages above 1kV and less than 52kV.

2.5. TECHNICAL FEATURES

- CIRCUIT BREAKER PANEL (D FUNCTION)

Rated voltage kV 36 / 38 Rated current A 200 Power frequency withstand voltage kV 70 Lightning impulse withstand voltage kV 170 Rated peak withstand current kA 50/65 Rated short-time withstand current kA 25/1s Circuit-breaker type Type E2 M1 Three position disconnector type Type: E0 M0 Working temperature -25º C, +40º C Insulating medium SF6 Rated gas pressure, relative 0,03 MPa General protection degree IP - 3X Gas tank protection degree IP - 67


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- LINE SWITCHGEAR (I FUNCTION)

Rated voltage kV 36 / 38 Rated current A 630 Power frequency withstand voltage kV 70 Lightning impulse withstand voltage kV 170 Rated peak withstand current kA 62,5 Rated short-time withstand current (1 s.) kA 25 Switch-disconnector type Type: E3 M1 Earthing switch type Type: E2 M0 Working temperature -25º C, +40º C Insulating medium SF6 Rated gas pressure, relative 0,03 MPa General protection degree IP - 3X Gas tank protection degree IP - 67


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3. HANDLING, TRANSPORT AND STORAGE

3.1. WEIGHTS AND DIMENSIONS

FUNCTIONS FORMED BY A (mm.) APROX WEIGHT (kg) D0 3+4 817 450 ID 2+3 1124 650 D00 3+4+4 1047 500 ID0 2+3+4 1384 720 D000 3+4+4+4 1277 515 ID00 1+3+4+4 1616 770 IID 1+2+3 1691 950 IID0 1+2+3+4 1951 990

* Please consult us for other combinations ** Transport pallets not included

DVCAS19041202


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3.2. SUPPLY, PACKING AND TRANSPORT

Products travel on the client´s own account, unless otherwise requested. Therefore, the company declines any responsibility regarding problems of supply.

Although the product offers a high degree of robustness, it has to be taken into account that inside its structure it contains several mechanisms and insulating parts which require careful handling. It is therefore advisable to use fork-lift trucks, cranes or differential pulleys with enough power and capacity for their transport and handling. Avoid: - Blows and sudden movements which may harm the

components. - Leaving the equipment in wrong positions or on unstable or

wet surfaces. - Moving or sliding them along inclined planes or stairs. DVCAS switchgear is supplied wrapped in a plastic cover which protects it against external agents.

DVCAS16030104

HAZARD OF TOP HEAVY LOAD

• If lifting the equipment by forklift, stabilize the shipping section with a safety strap.


WARNING

HAZARD OF UNBALANCED LOAD OR EQUIPMENT DISTORTION

• Do not remove the pallet until the shipping sections have reached the installation location.

• Always use the pallet to prevent equipment distortion.

Failure to follow these instructions can result in injury or equipment damage.

CAUTION


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For land transport, switchgear is fixed to a wooden platform and protected against dust and dirt by a plastic cover. For marine transport, packing is maritime type. Switchgears are protected with water vapor-tight covers, and tighten to a wooden platform. Eventually they are surrounded for an external wood structure. Maximum recommended storage time is six months from delivery. Units can be unloaded and transported by means of a fork-lift truck. In this case, it is advisable to place the rear side of the switchgear facing the driver, so as to avoid undesired damage on the front part of the unit. To manipulate the unit once it is unscrewed from the wooden pallet straps should be used and placed around the metal frame as shown opposite. When supplied unassembled, the units are provided with ringbolts on the upper part for lifting and transport by crane. The switchgear is correctly balanced when lifting from the 4 ringbolts simultaneously. Any other lifting method is not advisable, as there is a risk of overturning. Never use the individual ringbolts for manipulating a complete assembled switchgear combination, always use straps as shown opposite.

3.3. CHECKING ON DELIVERY Once the units arrive at their destiny, check the attached documents to make sure that the packings correspond to the requested order. A visual inspection of the units is advisable to check if they have suffered any damage during transport. Check the presence of the following elements: A- Switchgear number B- Label C- Nameplate D- Accessories Check the correspondence between the order and the data of the nameplate and the list of accessories. In case of disagreement, please file a claim to the transport company, stating the order number, damaged material, nature and cause of the damage. To assure the warranty of the material, fill in the report and to notify technical service center, so that the period of warranty of the material is regularized from the date of delivery.


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3.4. HANDLING AND UNPACKING Although the product offers a high degree of robustness, it has to be taken into account that inside its structure it contains several mechanisms and insulating parts which require a careful handling. For this reason, it is advisable to use fork-lift trucks, cranes or differential pulleys with enough power and capacity for their transport and handling. Avoid:

• Blows and sudden movements which may harm the components.

• Leaving the packings in wrong positions or on unstable or wet surfaces.

• Moving or sliding them along inclined planes or stairs. Unpacking:

• Remove the plastic cover. • Unscrew the wooden base from the switchgear. • Take the switchgear out.

This operation is done just before to start the switchgears stance in the erection place. If the plastic envelope is removed during the equipment reception, it will be place again to maintain the necessary protection.

3.5. STORAGE

The equipments are suitable for indoor installations according to the IEC 62271-1:2017 standard. This is the reason why the switchgears must be protected from the environment before and during the assembly and commissioning operations. Store the switchgear under the following conditions:

• In a closed and usually ventilated room which protects the unit from any contact with water, wind, sand, direct chemical pollution and condensations.

• With a temperature ranging over –5º C and 40º C. • Units must not remain in closed packings, such as for

example the maritime ones, for a period of time over six months.

-25º C

40º C


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4. ERECTION

4.1. GENERAL CONDITIONS This section contains instructions for installing DVCAS switchgear. Before installing, removing or performing work on or inside the equipment, read and understand the following instructions.

Before starting the assembly process, check that all the switchgear and material recorded in the transport documentation is in good condition, and the required tools are available.

4.2. MOUNTING All units are provided with holes for floor fixing. Minimum distances to the room are shown in the figure below. The surface on which the units are to be mounted should be level (±1.5 mm per meter length). The floor must provide adequate stability and drainage. The existence of water in cables trenches can affect the life of the product due to the risk of corrosion. Switchgear accessories and instructions are delivered in a separate package. Frame fixing to the floor should be done using 6x M12 screws.


• Apply appropriate personal protection equipment (PPE) and follow safe electrical work

practices.

• This equipment must only be installed and serviced by qualified, trained, and certified electrical personnel.

• Only qualified electrical personnel familiar with medium voltage circuits should

perform the instructions in this bulletin. Personnel must understand the hazards involved in working with or near medium voltage equipment,

• Turn off all power supplying this equipment before working on or inside it.

• Always use a properly sensing device to confirm power is off.

• Replace all devices, doors and covers before turning on the power to this equipment.


DANGER


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4.3. CONNECTION

- SWITCHGEAR CONNECTION Bushings are suitable for the connection of incoming cables by means of threaded screened plug-in connectors. Terminals are placed in a cable compartment provided with front covers interlocked with the corresponding earthing switch. In the outgoing line section (lateral cable compartment), bushing access is not interlocked per standard design. Before entering the compartment, the circuit must be in the grounded position. Also, an optional key interlock is available. These terminals can be adapted to all kind of cables, either dry or impregnated paper types. We recommend that only trained personnel make these terminals, following the instructions of the manufacturer accurately. To avoid dielectric failure and thermal defects, it is essential that the terminal and its electrical connection are correctly performed.

• High voltage cable connectors are “T” shape, screened and bolted type, profile C as per EN 50181.

• Follow their manufacturer’s instructions for their assembly. • When tightening the connectors, do not exceed the maximum value of 50 N·m (37 ft·lb).

Failure to follow these instructions can result in equipment damage.

HAZARD OF IMPROPER ELECTRIC CONNECTION

NOTICE


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- CONNECTION OF THE AUXILIARY CIRCUIT

Follow the steps in this section to make control-wiring connections. 1. Consult the customer wiring diagrams for re-connection of control wiring at the shipping splits, when applicable. Each wire has been identified and previously connected during assembly when tested at the factory. 2. Make all outgoing control connections according to the wiring diagrams. After wiring is complete, carefully DVCAS units can be equipped with the following options: - Circuit Breaker – D Function.

• Auxiliary contacts for circuit-breaker and 3 positions disconnector.

• Additional tripping coil for remote opening. • Motorised option: Spring charging motor + closing coil +

antipumping relay. - Line sectionalising switch – I Function

• Auxiliary contacts. • Motorised mechanism.

The connection terminals are located in the top of the switchgear and accessible by removing the upper front cover.

DVCAS13030604



practices.








DANGER


25

- EARTH SYSTEM All units are provided with a 40 x 5 mm copper bar located inside and at the rear of the main cable box. This earth bar provides connection points for:

• The main earth connection to the transformer substation. • Earthing points for the main MV cables.

This is essential for the protection of personnel against overvoltage.

DVCAS13030605


26

5. OPERATING INSTRUCTIONS

Opening and closing operations are performed with the operating handles supplied for that purpose or can be remotely controlled. The three-position disconnector in the circuit breaker panel (D function) is manual and dependent on the operator. Circuit-breaker operation is independent of the operator, stored energy type (charged spring mechanism).



practices.








DANGER


27

5.1. LINE SWITCH DISCONNECTOR AND EARTH SWITCH OPERATIONS

Line Switch disconnector panels are 3 positions devices and are fully interlocked to prevent the simultaneous connection of line switch and earth switch. When performing any operation, pay special attention to the indications on the mimic diagram, where the status of the different mechanisms can be seen Once the operation is initiated, do not change the direction of the operation before reaching the final position, as described in the following paragraphs.

- LINE SWITCH OPERATION AND BUSBAR CABLE WITH EARTH SWITCH Opening the switch disconnector

• Insert the operating lever into the switch disconnector control.

• Grasp the lever with both hands. • Turn the lever counter clockwise, up to reach the end of

stroke. The mimic diagram indicator will turn from the closed line position to the open line position ― .

• Extract the operating lever.

DVCAS19041203

DVCAS19041204


28

Closing the switch disconnector

• Act on the interlock, by shifting it downwards. • Insert the operating lever into the switch disconnector

control. • Turn the lever clockwise, up to reach the end of stroke.

The mimic diagram indicator will turn from the open line position ― to the closed line position .


Opening the earthing disconnector

• Insert the operating lever into the earthing switch control. • Grasp the lever with both hands. • Turn the lever counter clockwise, up to reach the end of

stroke. The mimic diagram indicator will turn from the closed earth position I to the open earth position ― .


DVCAS19041205

DVCAS19041206

DVCAS19041207

DVCAS19041208

DVCAS19041209


29

Closing the earthing disconnector Before closing the earthing switch, check that there is no voltage across the voltage presence signal lamp.

• Act on the interlock, by shifting it upwards. • Insert the operating lever into the earthing switch control. • Turn the lever clockwise, up to reach the end of stroke.

The mimic diagram indicator will turn from the open line position ― to the closed line position I .


DVCAS19041210

DVCAS19041211


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5.2. CIRCUIT BREAKER PANEL OPERATIONS BUSBAR CONNECTION AND EARTH CONNECTION

• Use the selector to choose the operation (busbar or earth connection). Push slightly and turn until the operating shaft corresponding to the operation that is going to be carried out, is accessible.

• Insert the operating handle in the appropriate shaft for busbar connection or for earth connection.

• Turn the operating handle 210º to the limit, in the indicated direction for the operation you wish to perform, and remove the operating handle.

• The direction of movement can be changed over at any moment regardless of whether this movement has been completed or not.

• To finish the operation, it is necessary to move the selector back to "0" position.

The busbar disconnector can only be turned from "connected to busbars" position to "earthed" position performing the following two operations successively:

1. Busbar disconnector "connected" - "disconnected" 2. Earthing switch "disconnected" - "connected"

For the opposite operation, follow the same steps the other way round:

1. Earthing switch "connected" - "disconnected" 2. Busbar disconnector "disconnected" - "connected.

DVCAS13030710

DVCAS13030709


31

BUSBAR DISCONNECTOR OPERATION

1.- Select the operation

DVCAS13031300

2.- Insert the handle

DVCAS13031301

3.- Turn in the indicated direction

DVCAS13031302

4.- Extract the handle and place selector in O

position

DVCAS13031303


32

EARTHING SWITCH OPERATION

- CIRCUIT BREAKER OPERATION The circuit breaker is provided with mechanical pushbuttons for opening and closing, marked “O” and “I” on the pushbuttons. Before a closing operation, it is necessary to charge the closing spring. Spring charging is done by introducing the handle in the opening, and moving it up and down several times; after the charging is complete, the spring charge indicator will change to charged position. Spring charging only occurs with the downward movement of the handle.

1.- Select the operation

DVCAS13031304

2.- Insert the handle

DVCAS13031305

3.- Turn in the indicated direction

DVCAS13031306

4.- Extract the handle and place selector in

O position

DVCAS16031500


33

A spring charging motor is also available as an option. In the case of a motorized mechanism, the spring charging is made automatically after any closing operation. The opening operation is performed locally by a mechanical pushbutton. The closing operation of the circuit breaker charges the opening spring.

discharged charged

Mechanical pushbuttons

Spring indicator

Cover for the spring charging

Operation counter

Circuit breaker position


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5.3. INTERLOCKS. - ACCESS TO CONNECTORS (LINE SWITCH OPERATION AND BUSBAR CABLE WITH EARTH

SWITCH) The cable box covers are interlocked with their respective earthing switch, thereby preventing access to the MV cables until the earth is applied. For removing the cable box cover, place the opening selector in unlocked position (open padlock signal). This will only be possible after closing the earth switch. Remove the screws and lift off the cover. In order to carry out the cable tests, it is possible to open the earthing switch once the cover has been removed. Re-close the earth switch in order to re-fit the cable box cover. After repositioning the cover, place the opening selector in locked position (closed padlock signal) and replace the fixing screws. Please contact us immediately if you observe any deviation in the interlock functionality. Described interlocks correspond to a typical functional scheme. Other functional schemas may include modifications on the standard described behavior, according to any special features introduced case-by-case.

- ACCESS TO CONNECTORS IN THE CIRCUIT BREAKER PANEL

The cable box cover can only be opened after earthing the MV cables. This is done by selecting earth position on the 3 position disconnector and closing the circuit breaker. Once earth is applied, remove the cable box cover screws, push the red button and lift off the cover. To replace the cover, lift it into position, push the red button and replace the fixing screws. For cable testing, there is a specific pushbutton located in the right side of the cable compartment which allows the circuit breaker to be opened. Please contact us immediately if you observe any deviation in the interlock functionality.

DVCAS16030700


35

- ACCESS TO CONNECTIONS IN THE BUSBAR CABLE COMPARTMENT To gain access to the bushings in the busbar cable compartment (right hand side of D function panel), firstly it is necessary to check that the cables are not live using the voltage presence indicator. After checking, proceed to remove the fixing screws and lifting off the cable box cover.

Voltage

presence


36

5.4. VOLTAGE PRESENCE INDICATION AND PHASE CONCORDANCE

- CONDITION BEFORE CONNECTION

- VERIFICATION OF NO VOLTAGE PRESENCE

Check that there is no voltage in all the phases of the incoming / outgoing line through the capacitive voltage indicators on the front panel, VPIS type, according to IEC 62271-206:2011. The blinker of each indicator shows the presence of voltage in the cable corresponding to the indicate phase (L1-L2-L3).

A: Indication lights B: Connection points (phases concordance)


• Apply appropriate personal protective equipment and follow safe electrical work practices before performing phase sequence tests

• Turn off all power supplying this equipment before working on or inside.

• Always use a properly rated voltage sensing device to confirm that power is off.

• Beware of potential hazards, wear personal protective equipment and take adequate safety precautions.

• This equipment must only be installed or serviced by qualified electrical personnel.

• Replace all devices, doors, and covers before turning on power to this equipment.

• In case some high voltage cables have not been connected to the switchgear, cover the corresponding sockets with a voltage-proof insulating cap.


DANGER

CBGS09061002


37

Under extreme brilliant illumination will be necessary improve the visual perception for additional ways, for example, shading the indication.

- PHASES CONCORDANCE CHECKING

Each phase has connection points that allow to check the phase concordance, by means of an adequate phase comparator connection (SCHNEIDER type, supplied optionally), or by means of a voltmeter. The phase comparator will be connected between the connecting points of the phase that we want to check, and will be illuminated if don’t exist concordance.

Instructions for phase concordance checking are provided with the phase comparator.

According to the standard practice of the installers, phase conductors of the installation are marked from left to right according to the phases L1-L2 and L3. If any difference is detected in the phase order respect to this practice, analyze the reason and contact with the assistance service department.


• The indication of the voltage presence indicator system isn’t enough to make sure of the absence of voltage in the switchboard. In any case, the appropriate security rules for works with voltage must be respected.


DANGER


38

5.5. CABLE TEST This test requires the use of cable test adapters for “T” terminals, supplied by the manufacturer of connectors. Proceed as follows for switch disconnector devices:

• Open the switch – disconnector of the line position whose cable is going to be checked.

• Check the voltage presence indicator, to ensure the cable is not live.

• Isolate the other end of the cable. • Close the earth switch. • Remove the cable box cover. • Remove the cover from the “T” connector of the cable that

is going to be tested. • Unscrew the insulating cap from the connector • Connect the test adapter. • Open the earth switch. • Test the cable with a maximum voltage of 72 kV DC. • Remove test connections. • Close the earth switch. • Fit the insulating cap and to the cover of the “T” connector. • Replace the cable box cover.

Proceed as follows for circuit breaker cubicles:

• Open the circuit breaker • Check the voltage presence indicator, to ensure the cable

is not live. • Isolate the other end of the cable. • Earth the cable, by closing consecutively the earth switch

and the circuit breaker. • Disconnect the cable connected voltage transformers (in

case there are any).

DVCAS16031700


• Apply appropriate personal protection equipment (PPE) and follow safe electrical work practices.

• Only qualified electrical personnel familiar with medium voltage circuits should carry

out this testing.

• During testing maintain a minimum clearance required by the Local and Company safety regulations.

• After completing dielectric testing, temporarily ground the busbar to remove any

residual charge.


DANGER


39

• Remove the cable box cover. • Remove the cover from the “T” connector of the cable that

is going to be tested. • Unscrew the insulating cap from the connector • Connect the test adapter • Remove the earth by opening the circuit-breaker. In order

to do this: release the interlocking that the circuit breaker being opened by pushing the mechanism release button on the upper side of the cable box. (See figure below).

• Test the cable with a maximum voltage of 72 kV DC. • Remove test connections. • Earth the cable. In order to do this: lift the cable box release

interlock until it latches, re-close the circuit breaker. • Fit the insulating cap and the cover of the “T” connector. • Connect voltage transformers (in case there are any). • Replace the cable box cover.

5.6. GAS CHECK

The circuit-breaker compartment is connected to a pressure gauge placed on the front panel. A low-pressure alarm contact for control can be optionally installed. The pressure-gauge can be replaced without gas emission thanks to the automatic closing valve it is provided with. SF6 gas is contained in a sealed pressure vessel. The quantity of SF6 gas, depending on the type and performances of equipment, is indicated on each individual nameplate. Additional information on SF6 and its disposal is available in Chapter 1, Safety Provisions.


40

5.7. COMMISSIONING

Before applying voltage to the incoming cables of the switchgear, the following checks should be made:

1. The equipment is correctly installed: level adjustment, fixing and distance to wall.

2. All HV and LV electrical connections have been correctly installed and tested. If any of the switch – disconnector panels (I functions) are not going to be in operation and without incoming cables, the corresponding earthing switch must be closed and locked by means of a padlock to avoid possible maloperation. It is advisable to fit insulating caps on the connectors, which provide identical electrical and mechanical characteristics as the “T” connectors. These insulating caps can be ordered from the connector supplier.

3. Mechanical operation of all devices (switch – disconnectors, earthing switches…) and the different interlocks of each unit. It is important to carry out the following operations:

• 5 manual closing / opening operations. • 5 electrical closing / opening operations.



• This equipment must only be installed and serviced by qualified, trained, and certified

electrical personnel.

• Only qualified electrical personnel familiar with medium voltage circuits should perform the instructions in this bulletin. Personnel must understand the hazards involved in working with or near medium voltage equipment,


• Before performing visual inspections, test, or maintenance on the equipment,

disconnect all sources of electric power. Assume that all circuits are live until they have been completely de-energized, tested, grounded and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of back-feeding.



DANGER


41

• 5 opening operations by tripping coil.

4. After checking all the above mentioned items, proceed with the HV cable tests which are deemed necessary, according to the instructions. The incoming cables are now ready to be energized, whilst keeping the corresponding switch – disconnector in the open position. Next, check the following points:

• Voltage presence on cables by means of lamp indicators. • Concordance of phases.

Once all the aforesaid requirements are fulfilled, the unit is ready to be put into service, by operating switch-disconnectors, disconnectors and circuit breakers.

6. MAINTENANCE



• This equipment must only be installed and serviced by qualified, trained, and certified

electrical personnel.

• Only qualified electrical personnel familiar with medium voltage circuits should perform the instructions in this bulletin. Personnel must understand the hazards involved in working with or near medium voltage equipment,


• Before performing visual inspections, test, or maintenance on the equipment,

disconnect all sources of electric power. Assume that all circuits are live until they have been completely de-energized, tested, grounded and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of back-feeding.



DANGER


42

When a high voltage equipment is being operated, certain elements are energized, others may be in usual or occasional motion and some parts may reach relatively high temperatures. As a consequence, its use may entail electrical, mechanical and/or thermal hazard. In order to provide an acceptable degree of protection for people and goods, we develop and make our products according to the integrated safety principle, based upon the following criteria:

• Eliminating risks, whenever posible. • When this is technically and/or economically not possible,

supplying the equipment with adequate protections. • Informing about the remaining risks to help the design of

operating procedures for the prevention of possible risks and to help the training of the operating personnel when carrying out these tasks and the use of appropriate staff safety measures.

• Use recyclable materials that are state of the art and conform to any applicable technical and economic restrictions, and establish procedures for the processing of the equipment and its components so that once they have come to the end of their useful lives, they can be treated in a way that respects as far as possible the environmental criteria established by the competent bodies.

As a consequence, in the equipment described in this manual and or in its vicinity, paragraph 11.2 of IEC 62271-1:2017 standard will be considered, and only properly trained and/or supervised personnel (as per EN 50110-1 and EN 50110-2). They must be fully familiar with the instructions and warnings contained in the manual and also with those of a general order which are applicable in accordance with the legislation in force (Occupational Hazards Prevention Law and, as it may be appropriate, the General Health and Safety Ordinance).

HAZARD OF SWITCHGEAR DAMAGE

• Preventive maintenance operations must be carried out regularly on medium voltage equipment.

• These switchgears have been designed for low maintenance service. Nevertheless, a regular inspection is advised, checking the gas pressure and condition of the external elements and to carry out the usual cleaning task. (See maintenance program).

Failure to follow these instructions can result in equipment damage.

NOTICE


43

6.1. INTERVENTION LEVELS Different levels have been established, which define the people who can carry out an operation as a function of the skills required.

Level 1: Client’s technical service

Level 2: Personnel authorized by the manufacturer

Level 3: Schneider after-sales service

6.2. CONTROL MECHANISM

For maintenance purposes, control mechanisms are the mechanical and/or electrical elements that allow the apparatus operation (disconnector and circuit breaker mechanism), mechanical links and interlocks. Dust, impacts, aggressive atmosphere, insufficient or excessive lubrication may adversely affect the mechanical operation of a device. Correct operation will be maintained by removing dust / general cleaning, appropriate lubrication and regular use of the device. Dust removal An extractor must be used for this operation. Do not use compressed air for this cleaning operation Cleaning-degreasing A completely clean dry cloth or brush free from any kind of solvent must be used for this operation. High-pressure spraying of products containing solvents (trichloroethane, trichloroethlylene) is strictly prohibited. The main disadvantages of such spraying may be:

• Impossibility of reapplying grease to inaccessible lubrication points (greased for life).

• Corrosion or clamping of non-regreased areas. • Deterioration due to the pressure. • Risk of overheating due to the presence of insulating

solvent on the contact areas. • Removal of special protection. • Deterioration of plastics.

Lubrication This operation is carried out after certain mechanical joints, such as those described in the maintenance procedures, have been cleaned Greases recommended by Schneider Electric must be used. Never apply too much grease, because excessive greasing combined with dust can cause the mechanism to malfunction.


44

Grease must never be applied to insulating parts. Operation The necessity for an installation to run continuously generally means that the power devices are seldom operated. Although the ageing process of a device may be accelerated if it is used too frequently, mechanical malfunctions may occur if it is not operated for along period of time. Regular operation is necessary to maintain the original performance of each operating unit. Interlocking with keys or padlocks must be fully tested to check that they are working correctly.

6.3. LOW VOLTAGE AUXILIARY CIRCUITS Auxiliary wiring It is used to transmit orders to the various control units of the device and retrieve its states A degraded connection or insulating material may prevent the device from operating or cause unwanted tripping. Auxiliary wiring must be checked and replaced at regular intervals, if necessary, especially in the event of vibrations, a high ambient temperature or corrosive atmospheres. Signalling contacts The signalling contacts allow the operator to view the states and to act accordingly. Any incorrect signalling can lead to device control errors that may endanger the operators. Contact failure (worn contacts, loose terminals) may be the result of vibrations, corrosion or abnormal overheating; preventive maintenance must ensure good continuity (or non- continuity) of the contact in the different states. Protection relay An electrical fault on the installation is detected by the relay which orders the circuit breaker to open in order to ensure that the equipment and operators are protected. Electronic components and cards are sensitive to the environment (ambient temperature, humid and corrosive atmosphere) and to harsh operating conditions (magnetic fields, vibrations, etc.). To ensure safe operation, the following must be checked at regular intervals:

• The tripping chain • The intervention times according to fault current levels.

Refer to the documents specific to the protection relay used.


45

6.4. POWER CIRCUIT

No maintenance is required for the main power circuit of the switchgear, as it is placed inside the SF6 cubicles without influence of the external conditions. The connections between the switchgear and other switchboard elements (MV cables, earthing systems) are elements that should be taken into account when maintenance works, as far as they are an important source of heat dissipation. Any tightening that does not conform to the recommendations can cause a thermal runaway resulting in a degradation of the device, insulating materials and cables, which may degenerate into a short circuit and/or fire. This type of malfunction is often due to the non-observation of the installation specifications when the switchboard is installed.

6.5. MAINTENANCE PROGRAM

The maintenance program must be carried out on the cubicles as soon as they are commissioned, following the frequency indicated in the table. The maintenance operator must have the required skill level as previously explained. These operations are applicable for the environment and operating conditions that meet the normal service conditions, in accordance with IEC 62271-1:2017 for indoor switchgear. Other kind of conditions could require different maintenance frequency than the indicated in the table In case of detection of any malfunction, please contact your nearest Schneider Electric representative.


46

Level1: Clients technical service. Level 2: Personnel authorised by the manufacturer Level 3: Schneider Electric after-sales service.

Check Frequency Intervention

level (years)

General

Visually check the general condition or the cubicle (front panel, abnormal noises …) Commissioning 1

Visually check the general condition or the cubicle (front panel, abnormal noises …) 5 1

Correct pressure gauge indication (green) Commissioning (+2 weeks) 1

Correct pressure gauge indication (green) recommended 1 1

Correct pressure gauge indication (green) 5 1

Gas state (SF6 quality) 30 3

Lubrication + interlocks performance checking 5 2

Voltage presence (VPIS indication) 5 1

Control mechanisms

Manual/Electrical operation of the disconnector mechanism (recommended) 1 1

Manual/Electrical operation of the disconnector mechanism + lubrication 5 2

Manual/Electrical operation of the circuit breaker mechanism (recommended) 1 1

Manual/Electrical operation of the circuit breaker mechanism + lubrication 3 2

Low voltage auxiliary circuits

Control circuits continuity and appearance check 5 1

Tripping chain check 5 1

Power circuits

Visually check MV cable connectors state Commissioning 1

Visually check MV cable connectors state (recommended) 5 1

Visually check earthing of the switchboard Commissioning 1

Visually check earthing of the switchboard (recommended) 5 1


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7. ANNEX

7.1 DEVICES AND EQUIPMENT

Three position disconnector operating handle. Ref. nº. 51083850M0

Circuit breaker spring charging handle. Ref. nº. P7M17022

Switch disconnector operating handle- Ref. nº. WLW04034S01

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Schneider Electric Industries SAS

Pol. Industrial Trobika Martintxone Bidea 4

E- 48100 Mungia (Spain) Tel. : +34 94 615 91 00

Email: [email protected]

WLW03855P01-EN

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