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Accident detection and measures for transformers

Accident detection and measures for transformers

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2018-01-31
  • Views:9

(Summary description)
  Abnormal noise occurs inside the transformer. Abnormal noise inside the transformer may have the following reasons: severe overload causes a heavy "buzzing" sound inside the transformer; due to poor contact or breakdown points inside the transformer, "squeaking" or "cracking" occurs inside the transformer Discharge sound; due to the loosening of individual parts of the transformer top cover connecting the shaft bolt, the transformer core is not clamped, causing the silicon steel sheet to vibrate, which will cause strong noise; when there is a grounding or short-circuit fault in the power grid, a large current flows in the windings. Strong noise; when the transformer is connected with large power equipment or equipment that can generate harmonic current, the operation of the equipment may cause the transformer to make a "wow" noise; due to the resonance of the iron core, the transformer produces noises of coarse and fine noise; transformer If the primary side voltage is too high and the current is too large, abnormal noise will occur; due to overvoltage, winding or lead wire discharges to the shell, or the iron core grounding wire is disconnected, the iron core discharges to the shell, and the transformer emits a discharge sound.

  Emergency measures: When an abnormal sound is found from the transformer, the possible causes should be judged based on the above analysis, and emergency measures should be taken in a targeted manner. If the abnormal sound inside the transformer is caused by loose parts or breakdown of winding wires, the power should be cut off immediately to avoid further expansion of the accident.

  Transformer oil level is too high or too low. Under normal circumstances, changes in oil temperature can change the oil level. As the oil temperature changes, the oil level also appears—a change in a certain range. However, under abnormal conditions, abnormal changes in the oil level may occur due to malfunctions such as oil seepage, water seepage, and other accidents. Secondly, changes in oil temperature are related to conditions such as load conditions and ambient temperature. When the oil level changes are inconsistent with these factors, it may be a false oil level. Reasons for false oil level: Oil standard pipe is blocked; Exhaust hole of explosion-proof pipe is blocked. In addition, if the oil level is too high, it will cause oil spills; if the oil level is too low, it may cause the internal lead wires and even the coils of the transformer to be exposed, leading to internal discharge.

  Treatment methods and emergency measures: If there is a gas relay protection, release its trip circuit to prevent accidental tripping. Operators of electrical equipment on duty should always check the indication of the oil level gauge. If the oil level is too high, the oil can be drained appropriately; if the oil level is too low, the oil can be refilled in time. If it is caused by transformer oil leakage, power outage maintenance and other emergency measures should be taken. When abnormal fuel injection is found in the oil pillow or explosion-proof pipe, the power supply of the transformer should be cut off immediately to prevent the expansion of faults and accidents.

  Transformer oil quality deteriorates or oil temperature suddenly rises. In working condition, the main function of transformer oil is cooling and insulation. When overheated operation for a long time or water enters the shell, it will absorb moisture, which will deteriorate the oil quality. Observation of the oil standard will reveal that the oil color is abnormally darkened or darkened; after sampling and analysis, it can be verified that the oil contains carbon particles and water, the acid value increases, the flash point decreases, and the insulation strength decreases. In this case, it is easy to cause a breakdown discharge between the winding and the casing, causing serious accidents. When the transformer is operating normally, a sudden increase in oil temperature is often the cause of overheating inside the transformer. The iron core catches fire, the winding turns are short-circuited, the internal screws are loose, the cooling device fails, and the transformer is seriously overloaded may cause the oil temperature to rise suddenly.

  Solutions and emergency measures: If the oil color is found to be abnormally darkened or darkened, the insulating oil needs to be regenerated and filtered; the oil temperature caused by the load factor suddenly rises, and the load can be appropriately reduced or adjusted; the oil caused by other abnormal conditions If the temperature suddenly rises, the power supply should be cut off immediately and the transformer should be overhauled.

  The transformer caught fire. When a fault occurs inside the transformer and it is not dealt with in time, it may catch fire and cause a fire. When the transformer catches fire, the insulating oil in the fuel tank burns and turns into gas, causing the fuel tank to bu

Accident detection and measures for transformers

(Summary description)
  Abnormal noise occurs inside the transformer. Abnormal noise inside the transformer may have the following reasons: severe overload causes a heavy "buzzing" sound inside the transformer; due to poor contact or breakdown points inside the transformer, "squeaking" or "cracking" occurs inside the transformer Discharge sound; due to the loosening of individual parts of the transformer top cover connecting the shaft bolt, the transformer core is not clamped, causing the silicon steel sheet to vibrate, which will cause strong noise; when there is a grounding or short-circuit fault in the power grid, a large current flows in the windings. Strong noise; when the transformer is connected with large power equipment or equipment that can generate harmonic current, the operation of the equipment may cause the transformer to make a "wow" noise; due to the resonance of the iron core, the transformer produces noises of coarse and fine noise; transformer If the primary side voltage is too high and the current is too large, abnormal noise will occur; due to overvoltage, winding or lead wire discharges to the shell, or the iron core grounding wire is disconnected, the iron core discharges to the shell, and the transformer emits a discharge sound.

  Emergency measures: When an abnormal sound is found from the transformer, the possible causes should be judged based on the above analysis, and emergency measures should be taken in a targeted manner. If the abnormal sound inside the transformer is caused by loose parts or breakdown of winding wires, the power should be cut off immediately to avoid further expansion of the accident.

  Transformer oil level is too high or too low. Under normal circumstances, changes in oil temperature can change the oil level. As the oil temperature changes, the oil level also appears—a change in a certain range. However, under abnormal conditions, abnormal changes in the oil level may occur due to malfunctions such as oil seepage, water seepage, and other accidents. Secondly, changes in oil temperature are related to conditions such as load conditions and ambient temperature. When the oil level changes are inconsistent with these factors, it may be a false oil level. Reasons for false oil level: Oil standard pipe is blocked; Exhaust hole of explosion-proof pipe is blocked. In addition, if the oil level is too high, it will cause oil spills; if the oil level is too low, it may cause the internal lead wires and even the coils of the transformer to be exposed, leading to internal discharge.

  Treatment methods and emergency measures: If there is a gas relay protection, release its trip circuit to prevent accidental tripping. Operators of electrical equipment on duty should always check the indication of the oil level gauge. If the oil level is too high, the oil can be drained appropriately; if the oil level is too low, the oil can be refilled in time. If it is caused by transformer oil leakage, power outage maintenance and other emergency measures should be taken. When abnormal fuel injection is found in the oil pillow or explosion-proof pipe, the power supply of the transformer should be cut off immediately to prevent the expansion of faults and accidents.

  Transformer oil quality deteriorates or oil temperature suddenly rises. In working condition, the main function of transformer oil is cooling and insulation. When overheated operation for a long time or water enters the shell, it will absorb moisture, which will deteriorate the oil quality. Observation of the oil standard will reveal that the oil color is abnormally darkened or darkened; after sampling and analysis, it can be verified that the oil contains carbon particles and water, the acid value increases, the flash point decreases, and the insulation strength decreases. In this case, it is easy to cause a breakdown discharge between the winding and the casing, causing serious accidents. When the transformer is operating normally, a sudden increase in oil temperature is often the cause of overheating inside the transformer. The iron core catches fire, the winding turns are short-circuited, the internal screws are loose, the cooling device fails, and the transformer is seriously overloaded may cause the oil temperature to rise suddenly.

  Solutions and emergency measures: If the oil color is found to be abnormally darkened or darkened, the insulating oil needs to be regenerated and filtered; the oil temperature caused by the load factor suddenly rises, and the load can be appropriately reduced or adjusted; the oil caused by other abnormal conditions If the temperature suddenly rises, the power supply should be cut off immediately and the transformer should be overhauled.

  The transformer caught fire. When a fault occurs inside the transformer and it is not dealt with in time, it may catch fire and cause a fire. When the transformer catches fire, the insulating oil in the fuel tank burns and turns into gas, causing the fuel tank to bu

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2018-01-31
  • Views:9
Information

  Abnormal noise occurs inside the transformer. Abnormal noise inside the transformer may have the following reasons: severe overload causes a heavy "buzzing" sound inside the transformer; due to poor contact or breakdown points inside the transformer, "squeaking" or "cracking" occurs inside the transformer Discharge sound; due to the loosening of individual parts of the transformer top cover connecting the shaft bolt, the transformer core is not clamped, causing the silicon steel sheet to vibrate, which will cause strong noise; when there is a grounding or short-circuit fault in the power grid, a large current flows in the windings. Strong noise; when the transformer is connected with large power equipment or equipment that can generate harmonic current, the operation of the equipment may cause the transformer to make a "wow" noise; due to the resonance of the iron core, the transformer produces noises of coarse and fine noise; transformer If the primary side voltage is too high and the current is too large, abnormal noise will occur; due to overvoltage, winding or lead wire discharges to the shell, or the iron core grounding wire is disconnected, the iron core discharges to the shell, and the transformer emits a discharge sound.

  Emergency measures: When an abnormal sound is found from the transformer, the possible causes should be judged based on the above analysis, and emergency measures should be taken in a targeted manner. If the abnormal sound inside the transformer is caused by loose parts or breakdown of winding wires, the power should be cut off immediately to avoid further expansion of the accident.

  Transformer oil level is too high or too low. Under normal circumstances, changes in oil temperature can change the oil level. As the oil temperature changes, the oil level also appears—a change in a certain range. However, under abnormal conditions, abnormal changes in the oil level may occur due to malfunctions such as oil seepage, water seepage, and other accidents. Secondly, changes in oil temperature are related to conditions such as load conditions and ambient temperature. When the oil level changes are inconsistent with these factors, it may be a false oil level. Reasons for false oil level: Oil standard pipe is blocked; Exhaust hole of explosion-proof pipe is blocked. In addition, if the oil level is too high, it will cause oil spills; if the oil level is too low, it may cause the internal lead wires and even the coils of the transformer to be exposed, leading to internal discharge.

  Treatment methods and emergency measures: If there is a gas relay protection, release its trip circuit to prevent accidental tripping. Operators of electrical equipment on duty should always check the indication of the oil level gauge. If the oil level is too high, the oil can be drained appropriately; if the oil level is too low, the oil can be refilled in time. If it is caused by transformer oil leakage, power outage maintenance and other emergency measures should be taken. When abnormal fuel injection is found in the oil pillow or explosion-proof pipe, the power supply of the transformer should be cut off immediately to prevent the expansion of faults and accidents.

  Transformer oil quality deteriorates or oil temperature suddenly rises. In working condition, the main function of transformer oil is cooling and insulation. When overheated operation for a long time or water enters the shell, it will absorb moisture, which will deteriorate the oil quality. Observation of the oil standard will reveal that the oil color is abnormally darkened or darkened; after sampling and analysis, it can be verified that the oil contains carbon particles and water, the acid value increases, the flash point decreases, and the insulation strength decreases. In this case, it is easy to cause a breakdown discharge between the winding and the casing, causing serious accidents. When the transformer is operating normally, a sudden increase in oil temperature is often the cause of overheating inside the transformer. The iron core catches fire, the winding turns are short-circuited, the internal screws are loose, the cooling device fails, and the transformer is seriously overloaded may cause the oil temperature to rise suddenly.

  Solutions and emergency measures: If the oil color is found to be abnormally darkened or darkened, the insulating oil needs to be regenerated and filtered; the oil temperature caused by the load factor suddenly rises, and the load can be appropriately reduced or adjusted; the oil caused by other abnormal conditions If the temperature suddenly rises, the power supply should be cut off immediately and the transformer should be overhauled.

  The transformer caught fire. When a fault occurs inside the transformer and it is not dealt with in time, it may catch fire and cause a fire. When the transformer catches fire, the insulating oil in the fuel tank burns and turns into gas, causing the fuel tank to burst, and the burning insulating oil jets out of the transformer, which will cause equipment damage and property loss. Internal or external short-circuit of transformer wires, severe overload, lightning strike or external fire source moving into the transformer may cause the transformer to catch fire.

  Emergency measures: a. Strengthen the operation and management of the transformer, try to control the oil temperature in the transformer not to exceed 85 ℃; regularly check and test the electrical performance of the transformer, and conduct regular oil degradation tests. b. The high and low voltage sides of the small-capacity transformer should have overcurrent protection links such as fuses; the large-capacity transformer should be equipped with gas protection and differential protection as required. When the high voltage is protected by a fuse, the rated current of the fuse for a transformer below 100KVA should be 2-3 times the rated current of the transformer. For transformers above 100KVA, the fuse should be selected at 1.5-2 times the rated current. c. The room where the transformer is placed is a first-class fire-resistant building; there should be good ventilation, the maximum exhaust temperature should not exceed 45°C, and the temperature difference between the inlet and exhaust air should be controlled within the range of 15°C; there should be oil blocking facilities and oil storage pits indoors ; According to safety requirements, do not install two transformers in the same room. d. Check the transformer load frequently, and the load shall not exceed the safety management regulations. e. For transformers introduced by overhead wires, install lightning arresters in accordance with regulations, and check the lightning protection devices before the thunderstorm season. f. Designate special personnel to maintain the transformer, and have inspection and inspection systems and records. Maintain the normal, safe and economic operation of the transformer and the clean working environment.

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