— Service High Voltage Products

Scope of inspection workGas insulated switchgear type ELK-04 / EXK-0

Regular inspection work according to manufacturer̀ s recommenda-tion improves the availability and reliability of your substation. As a result ABB̀ s service engineers prepare a final inspection report to evaluate customer̀ s status of gas insulated switchgear.

—01 Service engineer is preparing a final inspec-tion report

Circuit breaker• Visual check• Function control• Recording of velocity or switching time • Check of connected cable plug• Check of operation counter

Operating mechanism type HMB-1• Visual check• Function control• Visual check of oil level• Visual check of carbon brushes• Check of terminals (electrical connections) and

auxiliary switches• Check of function of spring travel switch• Measure charging time of hydraulic pump until

pump stop• Reading of operation counter• Check if stored operation sequence is enabled

without blocking• Visual check of external oil tightness• Check of function of anti-condensation heater• Visual check of connected cable plugs• Check of function of the power relays Fast acting earthing switch• Visual check• Function control• Visual check of carbon brushes

• Control of auxiliary switches / limit switches• Visual check of connected cable plugs• Check of function of anti-condensation heater• Check of hand crank and end position interlock

Combined disconnector / earthing switch• Visual check• Exchange tooth belt of gear box• Function control• Control of movable parts• Measure of motor current• Control of auxiliary switches / limit switches• Visual check of connected cable plugs• Check of function of anti-condensation heater• Check of hand crank and end position interlock

Gas compartment• Check of SF6-gas pressure• Measuring of SF6-humidity• Measuring of SF6-gas (air content)• Measuring of SF6-gas (decomposition products)• Check of gas-leakages• Check of density monitor values

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—We reserve the right to make technical changes or modify the contents of this document without prior notice. With re-gard to purchase orders, the agreed par-ticulars shall prevail. ABB AG does not ac-cept any responsibility whatsoever for potential errors or possible lack of infor-mation in this document.

We reserve all rights in this document and in the subject matter and illustrations con-tained therein. Any reproduction, disclo-sure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB AG. Copyright© 2019 ABBAll rights reserved

—ABB AG High Voltalge ProductsBrown-Boveri-Strasse 3063457 Hanau-Grossauheim, Germany

abb.com/highvoltage

Local control cubicle (LCC)• Visual check• Check of alarm circuits• Check of position indications• Check of bay interlocking• Check of control circuits according to wiring

diagram • Check of function of anti-condensation heater• Check of mechanical and electrical connections• Visual check of connected cable plugs• Functional test of protection trip on relays or

terminal

Current- and voltage transformer • Inspection of connections and earthing• Visual inspection

Functional and visual inspections are carried out frequently according to the product documentation.Gas compartments are not opened for such activi-ties. For the duration of the inspection the switchgear has to be partly taken out of service.

—02 Service engineer during the inspection

—02