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The main reasons for the overheating of dry-type transformer
Release time:
Mar 26,2025
Source:
Nanyang Xinte Electrical Co., Ltd.
The main reasons for the overheating of dry-type transformer are internal faults, load problems, poor heat dissipation, and environmental factors. The following is a detailed introduction:
⒈ Internal fault:
① Winding short circuit: Short circuits between turns, layers, and strands of dry-type transformers will form short-circuit loops, causing high temperatures at the short-circuit point. For example, rough manufacturing processes may cause mechanical damage to the insulation, or high temperature, overvoltage, and overcurrent may cause insulation aging and damage, which may all cause short circuits.
②Core problem: The insulation between the core silicon steel sheets is damaged due to external force or insulation aging, which will increase the eddy current and cause local overheating. In addition, the insulation damage of the through-screw will also generate eddy currents, causing the core to overheat.
③Abnormal tap changer: Insufficient contact pressure at the tap changer contact point, dirty contacts, or improper operation after switching the taps will increase the contact resistance and cause the contacts to heat up.
2. Load problem: Long-term overload operation will increase the copper loss, iron loss and additional loss of the transformer, generate excessive heat, and long-term friction between components will also cause the temperature to rise.
3. Poor heat dissipation:
①Cooling system failure: cooling fan failure, air duct blockage, poor air duct sealing, or leakage or poor circulation when using liquid cooling will all affect the heat dissipation effect.
②Deterioration of heat dissipation conditions: Too much dust accumulates on the surface of the transformer, which hinders heat dissipation; or the installation location is narrow and the ventilation is poor, so the hot air cannot be effectively discharged, causing the temperature to rise.
4. Environmental factors: When the ambient temperature is too high, the temperature difference between the transformer and the surrounding environment decreases, the heat dissipation capacity decreases, and the heat is difficult to dissipate, resulting in an increase in its own temperature.
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Nanyang Xinte Electrical Co., Ltd. is a National Hi-tech Enterprise integrating R&D, manufacturing， sales and service of high / low voltage switchgear cabinets, compact / prefabricated substations, dry-type transformers, oil-immersed transformers and accessories, Henan Specialized Special and New Enterprise, a drafting unit of the National Standard for Intelligent On-load Capacity and Voltage Regulating Transformer.
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