By Sunny | 07 August 2019 | 0 Comments

Transformer Accident Detection and Measures

Leilang-Electric is located in Shanghai,China.We are specialized in manufacturing all kind of low voltage transformer,three phase transformer,single phase transformer, variac transformer,voltage stabilizer, ac stabilizer,power regulator, reactor, etc.
There is abnormal dynamic and static inside the transformer. There may be the following reasons for abnormal dynamic and static in transformer: serious overload makes the transformer suffer heavy "buzz" sound inside; because of bad contact or breakdown point, the transformer suffers from "squeak" or "crackle" sound inside; because individual parts of the transformer top cover connecting bolt are loosened, the transformer voltage is changed. When the core of the transformer is not clamped, the vibration of the silicon steel sheet will announce strong noise; when there is grounding or short-circuit fault in the power grid, a large current flowing through the winding will announce strong noise; when the transformer is connected with a large power equipment or equipment capable of generating harmonic current, the operation of the equipment may cause the transformer to announce "wow". Because of the resonance of the iron core, the noise of the transformer occurs carelessly and carelessly; because of the excessive voltage and current on the original side of the transformer, the noise of the transformer will be abnormal; because of the over-voltage, winding or lead wire discharging on the outer shell or the disconnection of the grounding wire of the iron core, the core discharging on the outer shell will make the transformer announce the discharging sound.            
Emergency measures: When it is found that the transformer announces abnormal dynamic and static, the possible reasons should be judged according to the above analysis, and the emergency measures should be adopted pertinently. If the abnormal dynamic and static announcements inside the transformer are caused by loosening parts or breakdown of winding conductors, the power outage should be dealt with immediately to avoid further expansion of the incident end.            
Transformer oil level is too high or too low. Generally, the change of oil temperature can change the oil level. With the change of oil temperature, the oil level changes correspondingly in a certain range. However, in abnormal circumstances, because of oil seepage, water seepage and other problems will also cause abnormal changes in oil level. Secondly, the change of oil temperature is related to load condition and environmental temperature. When the change of oil level is inconsistent with these factors, it may be false oil level. Reasons for false oil level: blockage of oil standard pipe; blockage of exhaust hole of explosion-proof pipe. In addition, excessive oil level will lead to oil spill; too low oil level may lead to the internal discharge of lead wire and coil in transformer.
Processing and emergency measures: If gas relay is maintained, its tripping circuit will be exempted from mistake tripping. Electrical equipment operators on duty should often check the instructions of oil level gauge, find that the oil level is too high when the appropriate amount of oil is discharged; when the oil level is too low, timely refueling. If it is caused by oil leakage of transformer, power outage and other emergency measures should be adopted. When abnormal injection of oil into the sleeper or explosion-proof tube is found, the power supply of the transformer should be blocked immediately to avoid fault and expansion of the incident.
Transformer oil quality deteriorates or oil temperature suddenly rises. In operation condition, the main function of transformer oil is cooling and insulation. When the oil is overheated for a long time or the shell enters the water to absorb moisture, it will deteriorate the oil quality. Oil color anomaly can be found to deepen or darken by oil label observation. Sampling analysis can detect that the oil contains carbon particles and water, acid value increases, flash point decreases, and insulation strength decreases by one level. It is very simple to break down and discharge between the winding and the outer shell, which results in serious trouble. When the transformer is in normal operation, the sudden increase of oil temperature is often the cause of overheating inside the transformer. Core ignition, winding turn-to-turn short circuit, internal screw loosening, cooling equipment faults, serious transformer overload may suddenly increase oil temperature.
Solutions and emergency measures: when abnormal oil color deepens or darkens, it is necessary to regenerate and over-treat the insulating oil; because the oil temperature caused by load factor suddenly rises, the load can be reduced or adjusted appropriately; if the oil temperature caused by other abnormal conditions suddenly rises, the power should be cut off immediately and the transformer should be overhauled comprehensively.
The transformer is on fire. When there is a fault inside the transformer, and it is not handled in time, that is, it may catch fire, resulting in fire. When the transformer is on fire, the insulating oil in the tank is burned into gas, which causes the tank to burst and the burned insulating oil sprays out to the transformer, resulting in equipment damage and property loss. Short circuit inside or outside transformer conductor, serious overload, lightning strike or external fire source moving into transformer may cause transformer fire.
Emergency measures:
A. Strengthen the operation and management of transformers, try to control the oil temperature in transformers not to exceed 85 C; check and test the electrical functions of transformers regularly, and do oil degradation experiments regularly.
B. There should be over-current maintenance links such as fuses at the high and low voltage sides of small capacity transformers; gas maintenance and differential maintenance should be installed in large capacity transformers according to regulations. When maintaining high voltage fuses, the rated fuse current of transformers below 100KVA is  chose according to 2-3 times of the rated current of transformers. For transformers over 100KVA, fuses are  chose according to 1.5-2 times the rated current.
C. Transformer room is built for first-class fire-resistant construction; it should have good ventilation, higher exhaust temperature should not exceed 45 C, and the temperature difference between inlet and exhaust air should be controlled within 15 C; there should be oil-retaining equipment and oil storage pit in the room; two transformers should not be equipped in the same room according to safety requirements.
D. Always check the transformer load. The load must not exceed the safety regulations.
E. Transformers imported from overhead conductors shall be equipped with lightning arresters in accordance with regulations. Lightning protection equipment shall be inspected before thunderstorm season.
F. Set up a special person to maintain the transformer, with inspection and inspection criteria and records. Adhere to the normal safe and economic operation of transformers and clean working environment.
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