Transformer fault conditions:
Substation personnel on duty in the transformer operation is not normal, should try to eliminate as soon as possible, and immediately report to the superiors and make a record. When a serious failure of the transformer is found, the transformer should be shut down without a report to the dispatching. If there is a standby transformer in operation, put it into operation as soon as possible, and then report on scheduling and leadership. Such as:
1, the transformer sound significantly increased, very normal, internal burst sound.
2, a serious oil spill or fuel, so that the oil level drops below the oil level design instructions limit.
3, casing has a serious damage and discharge phenomenon.
4, the transformer smoke fire.
Transformer Fault Handling
First, the transformer sound significantly increased, it is not normal, the internal burst sound.
1, check the transformer load and cooling medium temperature, and with the same load and cooling conditions compared to the previous;
2, check the temperature measurement device;
3, check radiator valve is open, the cooling device or transformer room ventilation is normal. If the above are normal, the oil temperature than in the past under the same conditions, 10 ℃ higher, and still continue to rise, you can conclude that the transformer internal fault, such as the core of the ignition or inter-turn short circuit. Core ignition may be due to eddy current, or clamping with the core screw with the core contact, or silicon steel insulation damage, this time, the differential protection of gas protection does not work. The gradual development of the core caused by oil ignition gradually darkened, and the ignition part of the temperature rise quickly led to the oil temperature gradually increased and reached the point of the ignition temperature, which is very dangerous, if not timely removal of the transformer, it is possible A fire or explosion occurred. Therefore, should immediately report to the higher level, the transformer outage and maintenance.
Second, the main transformer oil and fire.
When a large number of transformer oil leakage leaving the rapid decline in the oil level, forbidden heavy gas protection to only act on the signal. Due to the low oil level (below the top cover) there is no heavy gas protection action in the trip, will damage the lead insulation. Sometimes the transformer has a "hissing" sound inside the transformer, and the formation of the air layer under the transformer cover, there should be a great risk, it must quickly take measures to prevent oil spills. Transformer on fire, should immediately cut off the power, stop running cooler. If the upper part of the top cover is on fire, if the transformer is fitted with an accident drain valve far away from the main body, immediately open the accident drain valve, place the oil below the oil tank of the fire, and extinguish the fire with carbon dioxide fire extinguisher or sand; Pay attention to the direction of oil flow to prevent the expansion of the fire caused by other equipment on fire.
Third, the main transformer protection action.
1, gas protection action when dealing with.
Gas protection according to the different nature of the accident, its action can be divided into two kinds: one is the action in the signal, does not trip; the other is both at the same time.
Light gas protection action, usually the following reasons:
A, as a result of filtering, fueling and start strong oil circulation device leaving the air into the transformer;
B, due to temperature drop or oil spill caused by slow down;
C, due to the external through the short circuit and produce a small amount of gas;
D, due to the impact of external short-circuit current through;
E, due to DC circuit insulation damage or deterioration of contacts caused by the malfunction.