ABB UC Panduan Pengguna - Halaman 8

Jelajahi secara online atau unduh pdf Panduan Pengguna untuk Peralatan Industri ABB UC. ABB UC 12 halaman. On-load tap-changers

5 Checking of the earth fault protector (option)

If the motor-drive mechanism is equipped with an outlet, the earth fault protector should be tested by

pressing the test knob on the outlet on BUE or on the separate earth fault protector on BUL.

6 Checking of the heater

Disconnect the incoming auxiliary power.

Before starting any work inside the motor-drive mechanism the auxiliary power must be switched off.

N. B. The motor, contactors and heating element may be energized from separate sources.

Open the control panel (BUE only).

Check by feeling with a finger on the protection plate that the heater has been functioning.

Close the control panel (BUE only). Reconnect the incoming auxiliary power.

Complete the inspection by turning the selector-switch to the REMOTE position and closing the

cabinet door.

7 Checking of the oil filter unit (option)

If the on-load tap-changer is equipped with an oil filter unit from ABB:

Read the pressure gauge.

Note the reading so the change from year to year can be seen.

If the pressure is 2.0 bar or more, or close to 2.0 bar, the filter insert should be replaced.

If moisture is suspected to have come into the on-load tap-changer compartment, the filter insert

should be replaced.

If a filter insert replacement is needed, call a specialist.

Also check for leakages. All leakages should be repaired!

Layout of on-load tap-changer

1. Bevel gears

2. Horizontal drive shaft with protective tubes

3. Oil valve

4. Pressure relay

5. Top section

6. Vertical drive shaft with protective tubes

7. Rating plate

8. Motor-drive mechanism

9. Diverter switch housing

10. Tap selector

WARNING