Transformer internal abnormal sound.Transformer internal abnormal noise may have the following reasons: serious overload in the transformer internal heavy "buzzing" sound.Due to internal have poor contact or breakdown point, in the transformer internal discharge of the "make" or "crack";Due to the transformer top connecting shaft bolt loose individual parts, the transformer core is not clamping, silicon steel sheet caused by vibration, have a strong noise;With grounding or short circuit fault in power grid, current flows winding a lot, have a strong noise;Transformer with the large power equipment or can produce harmonic current of the equipment, equipment operation may result in a cry of "when" transformer;Resonance, as core transformer noise occurrence of coarse and fine;Primary side of transformer high voltage, electric current metropolitan occurred different sound;Due to overvoltage, winding or lead discharge of enclosure, or core grounding line disconnect, the core of shell discharge, make the transformer heat discharge.
Emergency measures: when found abnormal noise from the transformer, analyze and judge the potential should be based on the above reasons, targeted to take emergency measures.Such as abnormal sound from the transformer internal because of loose parts or breakdown, winding wires shall be immediately blackout processing, in order to avoid the accident further.
Transformer oil level too high or too low.Usually the change of oil temperature can change the oil level.As the change of oil temperature, oil level also appeared - range change accordingly., but in normal circumstances, not because the permeability of oil and water seepage failure and other accident will cause the abnormal change of oil level.Second, the change of oil temperature and load conditions, such as environmental temperature conditions.When the oil level changes do not agree with these factors, may be false oil level.The reasons of false oil level, oil pipe blockage;Explosion-proof pipe vent plug.In addition, the oil level is too high will cause oil spill;Oil level is too low, could cause leakage, leads for transformer internal and coil lead to internal discharge.
Treatment method and emergency measures: is there a gas relay protection to trip circuit, prevent mistrip.Electrical equipment operating personnel on duty to regularly check oil level gauge instructions, found that when the oil level is too high to moderate oil drain;In time, when the oil level is too low to fill oil.If due to the transformer oil, power outage overhaul and other emergency measures should be taken.When they discovered oil conservator or explosion-proof abnormal injection pipe, shall be immediately cut off the power of the transformer, in order to prevent the failure and the expanding of the accident.
Transformer oil quality bad or sudden high oil temperature.In working status, the main effect of transformer oil is cooling and insulation.When long overheat water run or shell, absorb moisture, can make the oil quality bad.Through the oil standard observation will find oil color abnormal or black;The tested oil sample analysis can contains carbon and water, higher acid value, flash point, dielectric strength decrease, and so on.Occur between this kind of situation easily in the winding with shell breakdown discharge, causing serious accidents.When the normal operation of transformer, the oil temperature is often a cause for transformer internal overheat if suddenly rise.Core on fire, winding interturn short circuit, internal screw loosening, cooling device failure, serious overload transformer can make the oil temperature rise suddenly.
Method and emergency measures to solve the: oil found abnormal deepen or black color, need regeneration and filtering processing of insulating oil;Sudden rise caused by load factor of the oil temperature, can be appropriately reduced or adjust the load;Other anomalies caused by sudden high oil temperature, should immediately blackouts, sweeping overhaul of the transformer.
Transformer is on fire.When the transformer internal fault and not processed in a timely manner, that could catch fire, fire.Transformer is on fire, tank insulation oil combustion, into a gas, make the tank explosion, burning to the transformer insulating oil flow, will lead to equipment damage and property losses.Transformer wire internal or external short circuit, serious overload, lightning, or the fire into the transformer, could all cause transformer is on fire.
Emergency measures: a. in order to strengthen the management of the operation of the transformer, try to control the transformer oil temperature does not exceed 85 ℃;Regularly check and test the electrical properties of the transformer, do the oil degradation test on a regular basis.B. small capacity transformer with high and low pressure due the over-current protection fuse etc.);The large capacity of transformer should be installed in accordance with provisions gas protection and differential protection.When high pressure with fuse protection under the 100 kva transformer, fuse rated current according to the rated current of the transformer 2-3 times.More than 100 kva transformer, fuse according to 1.5 2 times the rated current of the choice.C. for transformer room for level 1 refractory building;Should have good ventilation, exhaust temperature should not be more than 45 ℃, highest intake and exhaust temperature control within the scope of 15 ℃;Block oil facilities and oil storage pit into the indoor environment;According to the requirements of safety the same indoor do not install two transformers.D. check the transformer load and load shall not exceed the safety management regulations.E. transformer, introduced by overhead conductors according to the rules of installing surge arrester, the thunderstorm season before the lightning protection device for inspection.F. designated persons for transformer maintenance, inspect and check the system and records.Keep the transformer normal safe and economic operation and the working environment clean.