Anhui vigorously analyzes the operation mode of oil transformer and dry transformer during power outage maintenance.

The oil change is divided into outdoor installation and indoor installation. There is no high-voltage outlet cabinet for outdoor installation, only outdoor isolation switch. The oil change inspection method on the outdoor tower and common problems and steps are as follows:

1. Open the control circuit of each group of the low-voltage cabinet;

2. Switch off the low-voltage capacitor compensation cabinet;

3. Disconnect the low-voltage main cabinet;

4. Wear qualified insulating shoes, insulating gloves, safety helmets, and separate the oil change isolation switch with the actual operating lever;

5. Wear qualified insulating shoes, insulating gloves, and safety helmets to carry out high-voltage electroscopes for transformers after power failure;

6. Use an insulation resistance tester to measure the resistance of the ground wire of the transformer (the standard cannot be larger than 4 ohms);

7. Charge and discharge the high-voltage end-to-ground and low-voltage end-to-ground hanging wire connectors for 10 minutes for the oil transformer after power failure;

8. Check and overhaul the oil change after charging and discharging;

9. Carry out preventive experiments on the oil change after inspection and maintenance (grounding resistance, resistance measurement, circuit resistance, oil quantity, oil pressure resistance, transformation ratio, absorption ratio...)

10. After the test is qualified and repaired on the spot, the switch is closed;

Indoor oil change:

1. Open the control circuit of each group of the low-voltage cabinet;

2. Switch off the low-voltage capacitor compensation cabinet;

3. Disconnect the low-voltage main cabinet;

4. Wear qualified insulating shoes, insulating gloves, safety helmets, turn off the power switch of the transformer outlet cabinet, make sure that the power switch is covered with the grounding device knife switch after the opening position, and confirm that the grounding device knife switch is coincident On the part of the gate, hang the maintenance safety sign;

5. Wear qualified insulating shoes, insulating gloves, and carry out high-voltage electroscopes for transformers after power failure;

6. Use an insulation resistance tester to measure the resistance of the ground wire of the transformer (the standard cannot be larger than 4 ohms);

7. Charge and discharge the high-voltage end-to-ground and low-voltage end-to-ground hanging wire connectors for 10 minutes for the oil transformer after power failure;

8. Check and overhaul the oil change after charging and discharging;

9. Carry out preventive experiments on the oil change after inspection and maintenance (grounding resistance, resistance measurement, circuit resistance, oil quantity, oil pressure resistance, transformation ratio, absorption ratio.)

10. After the test is qualified and repaired on the spot, the switch is closed;

11. Closing steps: a. Put on qualified insulating shoes, insulating gloves and safety helmets; b. Take out the maintenance safety sign; c. Cut off the knife switch of the grounding device and determine the broken part, and cover the high voltage Outlet cabinet power switch (low voltage you know)

What the dry-type transformer needs to do is only need to do the oil quantity inspection and the oil pressure test.