INSTRUCTIONS MANUAL DVCAS - Schneider Electricmt.schneider-electric.be/OP_MAIN/DVCAS/instructions/51081854.pdf · INSTRUCTIONS MANUAL DVCAS 36 kV Switchgears for transformer substations

INSTRUCTIONS MANUALDVCAS36 kV Switchgears for transformer substations in wind farms

51081854MA

March 09

Availability ofelectrical energy

Safetyoflife and property

OptimisedInvestment

Schneider Electric Industries SAS89, boulevard Franklin RooseveltF-92505 Rueil-Malmaison CedexTel: +33 (0)1 41 29 85 00www.schneider-electric.com

51081854M0 03-2009

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

Publishing: Schneider Eletric Industries SAS

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Instructions Manual 51081854MA Ind: AO

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INDEX INTRODUCTION ....................................................................................................................................... 2 1. CHARACTERISTICS AND APPLICATIONS........................................................................................ 4

1.1 SERVICE CONDITIONS ................................................................................................................ 4 1.2 DESCRIPTION ............................................................................................................................... 5

1.2.1 METALLIC TANK................................................................................................................. 5 1.2.2 S INTRODUCTION WITCH-DISCONNECTORS................................................................ 5 1.2.3 CIRCUIT BREAKER ............................................................................................................ 7 1.2.4 THREE POSITIONS DISCONNECTOR.............................................................................. 7 1.2.5 CABLE COMPARTMENT.................................................................................................... 8

1.3 APPLICATED STANDARS............................................................................................................. 9 1.4 TECHNICAL FEATURES............................................................................................................... 9

1.4.1 TRANSFORMER PROTECTION SWITCHGEAR (LE-DO, NE-DO)................................... 9 1.4.2 LINE SWITCHGEAR (RE-I, DE-I)....................................................................................... 10 1.4.3 RISER UIT EARTHING SWITCH SWITHCGEAR (RE-OT)................................................ 10

2. HANDLING, TRANSPORT AND STORAGE........................................................................................ 11 2.1 DIMENSIONS AND WEIGTHS ...................................................................................................... 11 2.2 SUPPLY, PACKING AND TRANSPORT ....................................................................................... 12 2.3 STORAGE ...................................................................................................................................... 13 2.4 DELIVERY...................................................................................................................................... 13 2.5 HANDLING AND UNPACKING...................................................................................................... 13

3.ERECTION ............................................................................................................................................. 14 3.1 GENERAL CONDITIONS............................................................................................................... 14 3.2 MOUNTING .................................................................................................................................... 14 3.3 CONNECTION ............................................................................................................................... 14

3.3.1 SWITCHGEAR CONNECTION ........................................................................................... 14 3.3.2 CONNECTION OF THE AUXILIARY CIRCUIT................................................................... 15 3.3.3 EARTH SYSTEM................................................................................................................. 16

4. OPERATING INSTRUCTIONS MANUAL............................................................................................. 17 4.1 SWITCH-DISCONNECTOR AND EARTHING SWITCH OPERATIONS ...................................... 18

4.1.1 LINE OPERATION / RISER WITH EARTHING SWITCH SWITCHGEAR.......................... 18 4.2 TRANSFORMER PROTECTION SWITCHGEAR ......................................................................... 19

4.2.1 THREE POSITION DISCONNECTOR OPERATION.......................................................... 19 4.2.2 CIRCUIT BREAKER OPERATION...................................................................................... 21

4.3 INTERLOCKS. SAFETY DEVICES................................................................................................ 22 4.3.1 ACCESS TO CONNECTORS (LINE OPERATION / RISER WITH EARTHING SWITCH SWITCHGEAR.............................................................................................................................. 22 4.3.2 ACCESS TO CONNECTORS (TRANSFORMER PROTECTION SWITCHGEAR)............ 22 4.3.3 ACCESS TO CONNECTORS (LATERAL COMPARTMENT CONNECTORS).................. 23

4.4 VOLTAGE PRESENCE INDICATION AND PHASES CONCORDANCE...................................... 23 4.5 CABLE TESTS ............................................................................................................................... 24 4.6 GAS CHECK .................................................................................................................................. 26 4.7 COMMISSIONING.......................................................................................................................... 26

5. MAINTENANCE .................................................................................................................................... 27 6. PANEL DESCRIPTION......................................................................................................................... 28 ANNEX ...................................................................................................................................................... 29

Instructions Manual 51081854 MA Ind: AO

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INTRODUCTION When a H.V. 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, those manufacturers belonging to SERCOBE develop and make their products according to the integrated safety principle, based upon the following criteria:

• Eliminating risks, whenever possible. • 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 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 (RAT, 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 and safe 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 essential 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..

• 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.


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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, loss of profits, periods of inactivity time, cost of repair or replacement of materials. Warranty Manufacturer guarantees this product against any defect in the materials or in its operation during the contract period. If any defects are discovered, the manufacturer may choose either to repair or to replace the equipment. Incorrect handling of the equipment , and/or repair by the user will be considered a breach of the terms of the warranty. 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. As a consequence of the constant standard and design evolution, the characteristics of the equipment described in these instructions can change respect as the indicated in the tables and illustrations. In case of additional information requirement we beg you to put into contact with our technical service centre.


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1.- CHARACTERISTICS AND APLICATIONS

1.1.- SERVICE CONDITIONS DVCAS type distribution switchgears have been designed for a safe, reliable and long-lasting operation, whenever the instructions of this manual are accurately followed, they are used for the purpose they have been designed for and for a service under the normal operating conditions of IEC 60694 (IEC 62271-1)

• Maximum temperature: 40º C and minimum: up to –5º C, the average value being less than 35º C over a 24 h. period.

• Altitude under 1000 m. • 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 might affect the safety and performance qualities of the unit, and also people and goods. For this reason, and before starting with its handling and installation, first of all, it is essential to read and understand the instructions manual and also to train the personnel in charge of the installation and service. MESA will accept no liability for any consequence which may be derived from the non-compliance with the instructions of the manual or any operation which is not described. Should any operation of this kind be carried out, it is advisable to inform us so that they can be performed in a safe way and may be included in future editions of the manual, for safety reasons. The operations described must comply with the current safety regulations and be carried out under the responsibility of a qualified person appointed by the client. As a result of materials development, you may find that certain characteristics of your unit do not exactly correspond to the information given in this document. If this is the case, please accept our apologies for it and we would welcome any comment about it or any other question about the system to our commercial department or after-sales service. At the end of this manual, please find attached the contact address for your consults and also a failure report form..


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1.2 DESCRIPTION SF6-insulated, MV prefabricated switchgears, DVCAS type are compact and specially suitable for installation in LV/MV transformer substation in wind farm. Cubicle is composed of an stainless steel, gas-tight cubicle which uses SF6 gas as insulating medium and houses the busbar system and the breaking devices. Each cubicle is provided of extensibility elements, that allows to build, by means of the adequate cubicles combination, the most common functional groups in wind farms. Functional modular units:

• Transformer protection: including vacuum circuit breaker and three position disconnector. It may include rigid riser between cable and busbar system.

• line operation: including three position switch-disconnector (ON –OFF- EARTHED)

• Riser with earthing switch:

1.2.1 METALLIC TANK The metal tank (no. 1) is made of a stainless steel sheet and includes welded bushings for power cables plug-in connections (no. 5 and 6). The tank is sealed-for life type, as per IEC 62271-200. The special design of all the 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.

1.2.2 SWITCH – DISCONNECTOR The switch – disconnectors (no. 4) are auto-pneumatic, three position type: ON – OFF – EARTHED, and therefore, intrinsically safe against maloperation. They conform to the general use category for frequent operation (100 operations), as per IEC 60265-1. They have short-circuit making capacity for both switch - disconnector and cable earthing operations.


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ARCHITECTURE

GENERAL SCHEME:

Fig. 1. Switch-disconnector mechanism Fig. 2. Protection circuit breaker mechanism


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1.2.3 CIRCUIT BREAKER Vacuum circuit breaker (no. 5) is placed inside the tank. It is a circuit breaker class E2 M1 as per IEC 62271-100 standard, with a rated operated sequence O-0.3s-CO-15s-CO Operating mechanism is placed outside the SF6 tank, being easily accessible for its maintenance and checking after removing the cubicle frontal cover.

1.2.4 THREE POSITION DISCONNECTOR The three position disconnector (ON – OFF - EARTHED) is actuated manually by means of a handle to be inserted in the frontal cover (dependent manual operation). Earthing switch making capacity is assured by the circuit breaker.

Fig. 3. Protection circuir breaker


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1.2.5 CABLE COMPARTMENT Cable compartments are wide spaces with front access, suitable to place a double connector arrange when necessary. Transformer protection cubicles includes (depending on the configuration) a lateral cable compartment, that allows to connect a MV cable directly to the busbar (rising function) The covers of the compartments equipped with manoeuvring devices are fitted with their respective interlocks with their own earthing switch. Lateral cable compartment (rising function) could be provided optionally with a key interlock. The covers of the compartments equipped with manoeuvring devices are fitted with their respective interlocks with their own earthing switch. Both the compartment covers and lateral cable compartment (rising function) could be provided optionally with a key interlock. Cubicles are provided with type C profile bushings as per EN 50181, suitable for connecting shielded connectors, manufactured according to the same standard. The following pictures show the types of connection the switchgear is provided with.

Fig. 4. Tranformer and line switchgear cable compartment Fig. 5

Lateral cable compartment (riser)


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1.3 APPLICATED STANDARDS Aplicable standards

IEC 60694 (62271-1): High voltage switchgear and controlgear. Common specifications.

IEC 62271-200: AC metal-enclosed switchgear and controlgear for rated voltages above 1kV

and up to and including 52kV.

IEC 60265-1 (62271-103): Switches for rated voltages above 1kV and less than 52kV.

IEC 62271-100: High-voltage alternating current circuit-breakers.

IEC 62271-102: High-voltage alternatign current disconnectors and earthing switches.

1.4 TECHNICAL FEATURES

1.4.1 TRANSFORMER PROTECTION SWITCHGEAR (LE-DO, NE-DO / D / 1A)

Rated voltage kV 36 Rated current A 200 Power frequency withstand voltage, 50 Hz., 1 min. kV 70 Lightning impulse withstand voltage kV 170 Rated peak withstand current kA 50 Rated short-time withstand current (3 s.) kA 20 Circuit-breaker type Type E2 M1 Three position disconnector type Type: E0 M0 Working temperature -5º, +40º Insulating medium SF6 Rated gas pressure, relative 0,03 MPa General protection degree (1) IP - 3X Gas tank protection degree IP - 67

(1) Except in the part where the cables go through


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1.4.2 LINE SWITCHGEAR (RE-I, DE-I / I / 1L)

Rated voltage kV 36 Rated current A 630 Power frequency withstand voltage, 50 Hz., 1 min. kV 70 Lightning impulse withstand voltage kV 170 Rated peak withstand current kA 50 Rated short-time withstand current (3 s.) kA 20 Switch-disconnector type Type: E3 M1 Eathing switch type Type: E2 M0 Working temperature -5º, +40º Insulating medium SF6 Rated gas pressure, relative 0,03 MPa General protection degree (1) IP - 3X Gas tank protection degree IP - 67

(1) Except in the part where the cables go through.

1.4.3 RISER UIT EARTHING SWITCH SWITHCGEAR (RE-OT / T / OLT)

Rated voltage kV 36 Rated current A 630 Power frequency withstand voltage, 50 Hz., 1 min. kV 70 Lightning impulse withstand voltage kV 170 Rated peak withstand current kA 50 Rated short-time withstand current (3 s.) kA 20 Eathing switch type Type: E2 M0 Working temperature -5º, +40º Insulating medium SF6 Rated gas pressure, relative 0,03 MPa General protection degree (1) IP - 3X Gas tank protection degree IP - 67

(1) Except in the part where the cables go through.


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2. HANDLING, TRANSPORT AND STORAGE

2.1 DIMENSIONS AND WEIGHTS

DVCAS

FUNCTIONS FORMED BY A (mm.) B (mm.) APROX WEIGHT (kg)0L+1A / DO 3+4 859 929 400 0L+1L+1A / IDO 2+3+4 1426 1496 675 0L+2L+1A / IIDO 1+2+3+4 1993 2063 950 0Lt+1A / OTD 1+3 1164 1234 650 0Lt+0L+1A / OOTD 1+3 1164 1234 650

* Please consult for other functions ** Transport pallets not included


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2.2 SUPPLY, PACKING AND TRANSPORT Products travel on the client’s own account, unless otherwise requested. Therefore, the company declines any responsibility regarding problems of delivery. Packages must be handled according to the instructions provided with them. DVCAS-type switchgears are supplied wrapped in a plastic cover which protects them against external agents. The unit is placed on a wooden platform and screwed down to it by its base to avoid undesired displacement of the unit. They 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. For the complete unit manipulation (once unscrewed from the wooden pallet), straps should be used., that should be placed down the metal frame. (see figure 6) When supplied unassembled, the switchgears are provided with ringbolts on their upper part for their lifting and transport by crane. The switchgear is perfectly balanced by pulling from the 4 ringbolts simultaneously. Any other lifting method is not advisable, as there is a risk of overturning. Never use this individual ringbolts for manipulating a complete assembled switchgear combination. IMPORTANT: Avoid blows or stresses on the sides of the unit

Fig. 6. Handling


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2.3 STORAGE • Units must not remain in closed packaging, such as for

example the maritime type, for a period over three months from the date of delivery by MESA.

• They must be protected against aggressive environments, such as chemical agents, concrete dust, acid emanations, fumes, saline atmospheres or ambient subject to condensation, etc.

• They must be stored in dry and ventilated areas to avoid the accumulation of dirtiness and condensation.

2.4 DELIVERY Once the units arrive at their destination, check that the packages correspond to the requested order with the attached purchase specification. We recommend a visual check of the units to verify if they have suffered any damage during transport. If this is the case, file a claim to the insurance company. The unit must be unpacked for this inspection. Please, refer to section 2.5. Next, check that the units are duly identified:

• Check the compliance of the data in the characteristics nameplate (no.18) with those of the purchase specification.

• Check that all the requested accessories are included. In case of disagreement, please make a complaint to the transport company, stating the order number, damaged material, nature and cause of the damage. To assure the warranty of the material, it is essential to fill in the failure report and inform MESA, so that the period of warranty of the material is regularized from the date of delivery.

2.5 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 which require a careful handling. For this reason, it is advisable to use fork-lift trucks or cranes with enough power and capacity for their transport and handling. Avoid:

• Blows and sudden movements which may harm the components.

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

• Moving or sliding them along stopped surfaces or stairs. Unpacking:

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

-5º C

40º C


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3. ERECTION

3.1 GENERAL CONDITIONS The buildings or rooms in which High Voltage installations are housed must be closed, so that access to them is restricted only to authorized personnel.

3.2 MOUNTING All the switchgears are provided with holes for floor fixing. Minimum distances to the room are shown in fig 7 Check that the surface on which the switchgears are going to be mounted is on a same level (±1.5 mm per meter length). Materials and instructions for grouping different switchgears (when applicable) are delivered in an specific package. Frame fixation to the floor should be made by using 4 screws M10. Use fixation points “a” or “b” depending in the rear access possibility.

3.3 CONNECTION

3.3.1 SWITCHGEAR CONNECTION In this switchgears, bushings are type C according to EN 50181, suitable for the connection of incoming cables by means of threaded screened plug-in connectors These terminals are placed in a cable compartment provided with front covers interlocked with the corresponding earthing switch Note: In riser function (lateral cable compartment), where there isn’t any manoeuvre device, bushing access is not interlocked. As a safety rule, before entering the compartment it is necessary to earth this point of the circuit. As an option, a key interlock could be provided.

FUNCTIONS A MIN B C MIN DO 50 929 218 IDO 50 1496 218 IIDO 50 2063 218

(O)OTD 10 1496 10

Fig 7


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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.

3.3.2 CONNECTION OF THE AUXILIARY CIRCUIT Switchgears can be equipped with the following options: Transformer protection switchgear.

• Auxiliary contacts for circuit-breaker and 3 positions disconnector

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

antipumping relay Line operation switchgear

• Auxiliary contacts • Motorized mechanism.

Riser with earthing switch switchgear • Auxiliary contacts

The connection terminals are placed in the top of the switchgear, being accessible after removing the upper cover. The electric schematics for all these options are attached at the end of this manual.

connection terminals cover


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3.3.3 EARTH SYSTEM On their lower part, all the switchgears are provided with a general earth collector by means of a 40 x 5 mm copper plate. This plate is provided with connection terminals (no. 15) in order to connect the unit to the general earth network of the transformer substation. This is essential for the protection of personnel against dangerous overvoltage. Earthing for the Medium Voltage cables will be connected in the same conductor.

Earth system


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4. OPERATING INSTRUCTION MANUAL

It is necessary to remind that access to this type of installations is authorized only to the operating personnel, who must be properly trained and be fully familiar with the warnings described in this manual. All the opening and closing operations are usually performed with the operating handles supplied for that purpose (fig. 8, 9, 10). On request, some operations can be remote controlled.

Operation is described in paragraph 4.1 The operating mechanism of line switch – disconnector is Tumbler type, with a spring charging system and independent of the operator. The operating mechanism of the earthing switches is also Tumbler type, with closing operations by means of a spring charging system independent of the operator, but with opening operations, manual and dependent on the operator. Three-position disconnector in Transformer protection switchgear is manual and dependant on the operator. Circuit-breaker operation is independent of the operator, stored energy type (previous charged springs).

Fig. 8. Line operating handle Fig. 9. Three position disconnector handle

Fig. 10. Circuit breakre spring charging hadle


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4.1 SWITCH – DISCONNECTOR AND EARTHING SWITCH OPERATIONS Due to the fact that switch disconnectors are 3 positions type and to the arrangement of independent operating shafts for the operation of switch - disconnectors and earthing switches, the following operations are intrinsically not possible: simultaneous connections of switch - disconnector and the corresponding earthing switch, as well as the direct turning from connected position to earthed position. NOTE: When performing any operation, you must pay special attention to the indications on the synoptic diagram, where the state of the different mechanisms is shown. NOTE: Once the operation is initiated, do not change the direction of the operation before reaching the final position, as described in the following paragraphs.

4.1.1 LINE OPERATION / RISER WITH EARTHING SWITCH SWITCHGEAR Line switch – disconnector

• To close: insert the operating handle into the shaft which corresponds to the line that is going to be closed, pull up hard until it reaches position I (see fig. 11) and remove the handle. The adjacent mimic diagram will show the indication I.

• To open: insert the operating handle into the shaft which corresponds to the line that is going to be opened and pull down hard to position O (see fig. 11). The adjacent mimic diagram will show the indication O.

Fig. 11


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Earthing switch • To close: Make sure there is no voltage on line cables

with the aid of voltage indicators (no. 19). Insert the operating handle into the earthing position shaft, pull down hard until it reaches position I and remove the handle. The adjacent mimic diagram will show the indication I (see fig. 12)

• To open: insert the operating handle, pull up hard to position O and remove the handle. The adjacent mimic diagram will show the indication O (see fig. 12). Do not forget that this operation is dependent on the operator.

Note: riser with earthing switch switchgear has only the shaft for the earthing switch.

4.2 CIRCUIT BREAKER OPERATIONS

4.2.1 THREE POSITION DISCONNECTOR OPERATION. Use the selector (fig 13) to chose the operation, by pushing smoothly and turning. The shaft for operating will be then accessible. Introduce the operating handle in the shaft. Turn the handle up to the end 210º, in the indicated direction depending on the operation. (fig13.3), and extract the handle. It is possible to change the direction of the operation in any moment, independent of the completion of the manoeuvre. To finish the operation, it is necessary to leave the selector in the “O” position (fig 13.4) In the following figures the operations are described graphically. Closing operations in both disconnectors are shown.

Fig. 12


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Busbar disconnector closing:

Earthing disconnector closing:

1- Select the operation 2 – Introduce the handle 3 – Turn in the indicated direction

4 – Extract the handle and place selector in 0 position

1 - Select the operation 2 – Introduce the handle 3 – Turn in the indicated direction

4 – Extract the handle and place selector in 0 position

Fig. 13


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4.2.2 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 have the closing spring previously charged. This spring charging is done by introducing the handle in the opening (fig 14), and moving it up and down several times; after the charging is complete, the spring indicator will change to charged position.

Spring charging only occurs with the descendent movement of the handle.

Note: in the case of a motorized mechanism, the spring charging is made automatically after any closing operation. Opening operation is always allowable locally by a mechanical pushbutton. It is the closing operation of the circuit breaker that causes the opening spring charge. The circuit breaker is equipped with a tripping coil, which will be operated by the protection relay in case of defect.

charged discharged

Mechanical pushbuttons

Cover for the spring charging

Spring indicator

Operation counter

Circuit breaker position

Fig. 14


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4.3 INTERLOCKS. SAFETY DEVICES

4.3.1 ACCESS TO CONNECTORS (LINE OPERATION / RISER WITH EARTHING SWITCH SWITCHGEAR) The covers (no. 9) are interlocked (no. 13) by means of their respective earthing switch, so that they prevent access to the connectors (no. 6). For removing the cover, place the opening selector in unlocked position (open padlock signal). This will be possible only after closing the earthing switch. In this position, proceed to take off the screws that fix the cover. In order to carry out the cable tests (section 4.5), it is possible to open the earthing switch in these positions when the cover of the terminals (no.9) is open. In any case, the earthing switch must be closed in order to close the cover of the terminals again. After repositioning the cover, place the opening selector in locked position (closed padlock signal) and place again the fixing screws. Please, report immediately to the manufacturer if you observe any deviation in the system functioning.

4.3.2 ACCESS TO CONNECTORS (TRANSFORMER PROTECTION SWITCHGEAR) Cable cover can be opened only after earthing the cables, by closing the earthing switch and closing the circuit breaker. In this position, take off the screws. Pull the interlocking latch up to the limit and extract the cover. To close again the cover, it will be placed in its initial position, and pull the latch down to the limit. Replace the fixation screws. For cable testing, there is a specific pushbutton in the upper side of the cable compartment, which allows opening the circuit breaker. The specific procedure it is explained in paragraph 4.5 Please, report immediately to the manufacturer if you observe any deviation in the system functioning.


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4.3.3 ACCESS TO LATERAL COMPARTMENT CONNECTORS To gain access to the bushings in the lateral cable compartment (right side of transformer protection switchgear), it is necessary to check the voltage absence in that point of the circuit. After checking voltage absence, proceed to dismount the cover by taking off the fixation screws.

4.4 VOLTAGE PRESENCE INDICATION AND PHASES CONCORDANCE The switchgears are provided with voltage presence indication systems (no. 19) fitted in the front panel, according to IEC 61958, both for line and protection cables. Each light flashes to indicate voltage presence in the cable corresponding to the indicated phase (L1 – L2 – L3). WARNING: The indication of the voltage detection system alone is not enough to assure that the system is not live. In any case, the appropriate safety rules for voltage work must be observed. Certain units are provided with voltage sockets as per IEC 61243 standard. Such sockets are usually fitted with removable voltage indication lamps. In case there is no lamp, the supplied short-circuit plugs must be connected into the sockets. Under extremely bright lighting conditions, it may be necessary to increase visibility, for example by shading the indicator.

Voltaje presence indicator

Fig. 15

Indication light

Connection points (phases concordance)


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Checking concordance of phases Each phase is provided with connection points for the checking of phases concordance by means of the connection of a suitable phase comparator unit (MERLIN GERIN type, supplied optionally) or by means of a voltmeter. The phase comparator unit will be connected between the connection points of the phases that we want to check and will light up in case of no concordance. The voltage measured between the connection points is dependant on the substation conditions. As an indication, the voltage measured in case of concordance is less than 12V. In case of doubt, please contact the MESA technical service. The maximum phase-earth voltage that can be recorded on the connection points never exceeds 150 V, so specific elements for isolation or measure are not required. In switchgears supplied with voltage sockets suitable for lamps IEC 61243 type, the connection points for concordance checking coincide with the black eyebolts in which the lamps are connected. The maximum phase-earth voltage values that can be recorded in this case do not exceed 350 V, with a current lower than 1mA in case of short-circuit between the connection point and earth. NOTE: According to the standard practice of the electricians, the conductors of the preceding phases of the already existing installation are marked from left to right according to phases L1 – L2 and L3. If you detect any difference in the order of phases with respect to this practice, please analyse the reason and contact SCHNEIDER ELECTRIC ’s Technical Service. Remember, however, to take the power terminals indication as basic reference and use the auxiliary sockets available in the switchgear for help.

4.5 CABLE TEST This test requires the use of cable test adapters for “T” terminals, supplied by the manufacturer of connectors. Proceed as follows for line operation switchgears

• Open the switch – disconnector of the line position whose cable is going to be checked (section 4.1.1).

• With a voltage presence indicator, check that the cable is not live (section 4.4).

• Insulate the other end of the cable. • Close the earthing switch (section 4.1.1). • Open the protection cover (section 4.3.2). • 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 (see fig. 16). • Open the earthing switch (section 4.1.1). • Test the cable with a maximum voltage of 72 kV dc • Remove test connections. • Close the earthing switch (section 4.1.1). • Fit the insulating cap and the cover of the “T” connector. • Close the protection cover (section 4.3.2).


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Proceed as follows for transformer protection cubicles.

• Open the circuit breaker by using its pushbutton in the frontal cover.

• With a voltage presence indicator, check that the cable is not live (section 4.4).

• Insulate the other end of the cable. • Earth the cable, by closing consecutively the earthing

switch and the circuit breaker (section 4.2.1) • Open the protection cover (section 4.3.2). • Remove (if any) the voltage transformers. • 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 (see fig. 16) • Disconnect the circuit-breaker. Do so with specific

operation: release the interlocking that blocks the opening, by pushing the mechanism placed on the upper side of the cables area. (See figure below).

• Test the cable with a maximum voltage of 72 kV dc • Remove test connections. • Earth the cable, by closing consecutively the earthing

switch and the circuit breaker (section 4.2.1) • Fit the insulating cap and the cover of the “T” connector. • Place again, if any, the voltage transformers


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4.6 GAS CHECK Although these units are factory-tested to guarantee a reliable operation for 30 years without gas refilling, they are provided with a pressure gauge to check the condition of gas (no. 17). When the indicator needle is on the green sector, the condition of gas is the right one. If the needle is on the orange area, there is no risk for the operation but you should contact MESA Technical Service. Optionally, the cubicles can be delivered with a manometer provided with auxiliary contacts.

4.7 COMMISSIONING Before applying voltage to the incoming cables of the switchgear, check the following aspects:

1. The correct installation of the equipment, that is, level adjustment, fixing and distance to wall. (section 3.2).

2. The correct performance of all HV and LV electrical connections (section 3.3). If any of the switch – disconnectors fitted in the switchgear is not going to be in operation and is left without incoming cables, the corresponding earthing switch must be closed and blocked 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 to the same suppliers as the connectors.

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

• 5 manual closing / opening operations. • 5 electrical closing / opening operations. • 5 opening operations by tripping coil.

WARNING: To perform the above mentioned operations, please follow the instructions on the operation plates.

4. After checking all the above mentioned items, proceed with the HV cable tests which are deemed necessary, according to the instructions on section 4.5. At this moment, the incoming cables are ready to be energized, keeping the corresponding switch – disconnectors in open position. Next, check the following points:

• Voltage presence on cables by means of lamp indicators. • Concordance of phases as per the directions of section

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


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5. MAINTENANCE DVCAS-36 switchgears fit the description of metal-enclosed switchgear. Access to the transformer substations in which they are installed is restricted to authorized and qualified personnel due, mainly, to the potential risk of electrical power manipulation. SAFETY MEASURES Before starting the work in any part of the installation:

• Disconnect and isolate this part of the installation. • Earth and short-circuit it. • Secure it against reconnection. • Disconnect the auxiliary voltage, operating on the pre-

connected low voltage circuit-breakers. • Do strictly observe the local and the manufacturer’s safety

specifications and prescriptions regarding high voltage installations.

As it has already been said, these switchgears have been designed for low maintenance work. Nevertheless, a regular inspection (4 years) is advisable to carry out the gas check, the usual cleaning tasks and the checking of the condition of external elements. Pay special attention to cable connectors, voltage indicators, operating mechanisms (use lubricant type ISOFLEX TOPAS NB52, made by KLUBER) and gas condition, as per section 4.6. Should any anomaly be observed, please contact our Technical Service. At the end of this manual, you will find attached a failure report form.


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6. PANEL DESCRIPTION

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 comparment (riser)

24. Lateral conecctions (cable riser)

25. Metal frame


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FAILURE REPORT MESA (Manufacturas Eléctricas S.A.) Apartado 8 / P.O. BOX 8 LAUAXETA, 44 48100 MUNGUIA (VIZCAYA) ESPAÑA / SPAIN TEL (SPAIN). 94 615 91 00 FAX 94 615 91 10

FAILURE REPORT IDENTIFICATION: Customer: Location: Type of equipment:

Order No: Serial No.: Installation date:

SERVICE RECORD: Date last inspection: Modifications carried out: Total No of operations:

Date of fault: No of operations since last service:

FAULTY COMPONENTS:

AMBIENT CONDITIONS:

CLASSIFICATION OF FAULT: Important

Slight

Defect

ORIGIN AND CAUSE OF FAULT: ORIGIN: Mechanical

Electrical

Other

CAUSE: Design

Instructions

Installation

Other

CONSEQUENCES: Stoppage time: Repair time: Labour cost: Cost of parts:

Documents

INSTRUCTIONS MANUAL DVCAS - Schneider Electricmt.schneider-electric.be/OP_MAIN/DVCAS/instructions/51081854.pdf · INSTRUCTIONS MANUAL DVCAS 36 kV Switchgears for transformer substations