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SGC DF-2 Quick Start Manual

Medium voltage switchgear
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DF-2
MEDIUM VOLTAGE SWITCHGEAR
THE MODULAR CONCEPT
Manual integrated surge arrester and
surge arrester monitor
READ THIS DOCUMENT CAREFULLY BEFORE ANY OPERATION
THE SPECIALIST IN
MEDIUM VOLTAGE SWITCHGEAR
SwitchGear Company nv - Moorstraat 24 - B-9850 Nevele - Belgium
Tel: +32 (0)9/321.91.12 - e-mail: info@switchgearcompany.eu -
www.switchgearcompany.eu
Rev.1 (22/10/2015)

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  • Page 1 DF-2 MEDIUM VOLTAGE SWITCHGEAR THE MODULAR CONCEPT Manual integrated surge arrester and surge arrester monitor READ THIS DOCUMENT CAREFULLY BEFORE ANY OPERATION THE SPECIALIST IN MEDIUM VOLTAGE SWITCHGEAR SwitchGear Company nv - Moorstraat 24 - B-9850 Nevele - Belgium Tel: +32 (0)9/321.91.12 - e-mail: info@switchgearcompany.eu - www.switchgearcompany.eu...
  • Page 2 The information contained within is applicable to the standard version of the DF-2 medium-voltage switchgear. Therefore, SGC nv - SwitchGear Company cannot be held liable for any damage resulting from specifications that differ from the standard version of the DF-2 medium-voltage switchgear.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS PREFACE NTRODUCTION ICTOGRAMS AND SAFETY SYMBOLS IN AND ON THE MEDIUM VOLTAGE SWITCHGEAR ICTOGRAMS IN THE DOCUMENTATION ELATED DOCUMENTATION ERVICE AND TECHNICAL SUPPORT ENERAL SAFETY DIRECTIONS AND INSTRUCTIONS NTENDED USE SURGE ARRESTER AND SURGE ARRESTER MONITOR 1 GENERAL DESCRIPTION 1.1 L OW VOLTAGE COMPARTMENT...

  • Page 4: Preface

    This document uses the term “medium voltage switchgear” to denote a random, but in actual practice, existing combination of DF-2 functions that, mutually coupled and connected, constitute a client-specific transformation or distribution station.

  • Page 5: Pictograms In The Documentationv

    Protect the medium voltage switchgear from water and damp. Related documentation The following technical documentation for medium voltage switchgear is available: • Installation manual DF-2 • User manual DF-2 • User manual VA-2/VAS-2 • User manual Arc-killer SV-25 on VA-2/VAS-2...

  • Page 6: Service And Technical Support

    − General safety directions and instructions SGC – SwitchGear Company nv does not accept any liability for damage or injury caused by not (strictly) following the safety directions and instructions, or by negligence during the installation, use, maintenance, or the repair of the medium voltage switchgear and its accompanying options.

  • Page 7: Intended Use

    SwitchGear Company nv. Any other or further use is not in accordance with the intended use. SGC – SwitchGear Company nv does not accept any liability for damage(s) or injuries resulting from deviation(s) of the intended use. The medium voltage switchgear complies with the current norms and guidelines. See: Technical Brochure •...

  • Page 8: Surge Arrester And Surge Arrester Monitor

    SURGE ARRESTER AND SURGE ARRESTER MONITOR GENERAL DESCRIPTION The surge arrester and the surge arrester monitor are both integrated in the corresponding cubicle. The surge arrester is mounted in the cable compartment; the surge arrester monitor is integrated in the low voltage compartment of the cubicle. Low voltage compartment The leakage current of the surge arrester is measured in a continuous manner.

  • Page 9: Cable Compartment

    Cable compartment The surge arrester is mounted in the cable compartment between the current transformer and the capacitive insulator. Figure 2: Front view DF-D, door removed Surge arrester Figure 3: Detailed view cable compartment DW603315...

  • Page 10: General Use

    GENERAL USE The leakage current of each individual surge arrester is monitored (Figure 4). During the lifespan of the surge arrester at rated voltage, three different phases can be distinguished: • Green zone: leakage current is less than 2mA; surge arrester is in good condition •...

  • Page 11: End Of Life Surge Arrester

    END OF LIFE SURGE ARRESTER When the surge arrester is at the end of its lifespan, following steps should be made to perform the replacement in a safe and efficient manner. Preparation before disassembling The following preparations must be made before starting to disassemble the cubicle. Make that the entire medium voltage switchgear and the circuit breaker is de- energized and grounded.

  • Page 12: Retract The Circuit Breaker

    3.2.2 Retract the circuit breaker If an arc-killer is present, make sure that the arc-killer is in grounded position and that the coupling between arc-killer and cubicle is disconnected [2 ] before retracting the circuit breaker Figure 6: Removing the circuit breaker from the cable compartment Make that the entire medium voltage switchgear and the circuit breaker is de-energized and grounded.

  • Page 13: Remove Pre-Assembly Surge Arrester

    3.2.3 Remove pre-assembly surge arrester Once the circuit breaker is removed from the cable compartment, the pre-assembly of the surge arrester can be disconnected. Figure 8: Remove copper connection CT - Insulator Figure 7: Cable compartment, VCB retracted • Loosen the connection to the current transformer o Loosen the hexagonal tap bolt (Figure 8A) o Remove the washers (Figure 8B and C) •...
  • Page 14 Once the connection copper between current transformer and capacitive insulator is removed, loosening of the pre-assembly of the surge arrester can be started. Unplug the connector (Figure 9A) located at the front, afterwards remove the nuts (Figure 9B) and the washers (Figure 9C). Figure 9: Remove of the pre-assembly surge arrester DW603315...

  • Page 15: Replacement Pre-Assembly Surge Arrester

    Disassembly procedure 3.3.1 Replacement pre-assembly surge arrester The replacement can be done by performing the opposite operation. Fix the pre- assembly using the nuts (Figure 10B) and the washers (Figure 10C). Replug the connector (Figure 10A) located at the front. Figure 10: Replacement pre-assembly surge arrester DW603315...
  • Page 16 Once the pre-assembly is back into place, the connection copper between CT and the capacitive insulator can be mounted. • Mount the connection to the current transformer o Place the washers (Figure 12B and C) on the hexagonal tap bolt (Figure 12A) o Place the combination in the copper connection (Figure 12I) and the copper space (Figure 12J).

  • Page 17: Insert The Circuit Breaker

    3.3.2 Insert the circuit breaker If an arc-killer is present, make sure that the arc-killer is in grounded position and that the coupling between arc-killer and cubicle is disconnected before retracting the circuit breaker Figure 13: Entering the circuit breaker Place the circuit breaker with its rear wheels in the transport rails and enter the circuit breaker against the rear stop guides.

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