Maintenance And Repair Matters Of 10kV High-voltage Switchgear

Maintenance and repair matters of 10kV high-voltage switchgear

1、 Daily maintenance and repair

(1) Appearance inspection of the switchgear.

The shell of the switchgear shall be free from deformation and damage; The protective paint is free from severe rust, damage, and peeling; The cabinet body is firmly installed, and the appearance is clean and free of debris; The nameplate and identification of the switchgear shall be neatly pasted without detachment.

(2) Check the operating status parameters of the switchgear.

The instrument and meter indications are normal (compared to daily operating values, there is no difference or no significant difference and corresponds to the equipment status).

(3) The relevant components, electrical contacts, wires, and cables of the switchgear shall not exceed the specified temperature.

Use an infrared thermometer to measure the operating temperature of visible related devices, electrical contacts, wires, and cables to be ≤ 60 ℃, and there is no odor inside the cabinet.

(4) Whether the switch position, indicator light indication and instrument display are correct, and whether the position of each transfer switch is normal.

The opening and closing positions of the switch are correct, there is no alarm indication, and the transfer switch is in the specified position.

2、 Planned maintenance and repair once a year

(1) Inspect, clean, and eliminate various defects found during daily inspections of the cabinet casing.

1) Wipe with alcohol and white cotton cloth to ensure no dust or stains are accumulated.

2) The protective paint should not be severely rusted, damaged or peeled off, otherwise rust removal and repainting should be carried out.

(2) Cable room inspection and maintenance.

1) The cable hole is well sealed.

2) The fixing screws of the cable plug are not loose.

3) The cable identification plate has not fallen off, and the cable phase sequence color code has not fallen off.

4) The cable room is dry without condensation and cleaned for dust removal.

5) Wipe the insulator with alcohol and white cotton cloth to ensure there is no dust or stains.

6) The grounding wire is not loose and firmly connected.

(3) Inspection of grounding switch.

Manually operate the grounding switch for one cycle, and the switch operates normally without jamming. The switch position and panel position indication are normal.

(4) Inspection and maintenance of circuit breaker room components.

1) Shake the main circuit breaker to the exit position, use a small car to pull it out of the cabin, and check the primary circuit isolation contact finger and its connecting copper bar for signs of burning or discharge; Depending on the situation, it may be necessary to use sandpaper for polishing and alcohol cotton cloth for wiping.

2) Apply 0.5~1mm thick conductive paste evenly on the isolation contact finger of the main circuit breaker.

3) Tighten all bolts on the primary circuit according to the torque requirements. After tightening the bolts, check that the spring washers are flat. After completing the tightening operation, mark anti loosening lines on all bolts on the primary circuit.

4) Wipe all components inside the circuit breaker room with alcohol and white cotton cloth to ensure there is no dust or stains.

5) Push the main circuit breaker into the circuit breaker compartment with a trolley and swing it to the testing position. Manually operate the closing and opening of the circuit breaker for one cycle. The circuit breaker operates normally without jamming, and the mechanical position indication, circuit breaker opening and closing position indication, spring energy storage and no energy storage indication are all normal.

6) After checking that there are no errors, shake to the input position and execute the operation according to the requirements for power outage and transmission.

(5) Secondary circuit room inspection and maintenance.

1) Check the secondary wiring: the wiring is tight and the wire number is clear.

2) Check the cleanliness inside the cabinet: there is no accumulated dust or foreign objects.

3) If necessary, clean and remove dust and tighten the secondary wire.

3、 Annual electrical test

(1) Insulation test for the main circuit of the circuit breaker.

Using a 2500V megohmmeter for measurement, the measured value is greater than 50M Ω.

(2) Power frequency AC withstand voltage test (circuit breaker main circuit to ground, phase to phase, and fracture).

1) After major repair: The test voltage value shall comply with the specified value.

2) During operation: The test voltage value shall be 0.8 times the specified value.

(3) Insulation testing of auxiliary and control circuits.

Using a 500V megohmmeter for measurement, the measured value is greater than 2 M Ω.

4、 Necessary troubleshooting

(1) Correct the working position of the circuit breaker.

Apply conductive adhesive or Vaseline on the inner ring of the moving contact, then push the handcart into the working position, and then pull it out. At this time, use a caliper to measure the effective engagement depth of visible moving and static contacts on the static contact, which should be 15~25mm.

(2) Maintenance and replacement of circuit breakers.

Replace according to the specific parameter requirements of the manufacturer.

(3) Maintenance and replacement of instruments and meters.

Replace according to the specific parameter requirements of the manufacturer

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