[Xiaoman] How to avoid overheating of dry-type transformers in hot and rainy weather?


Release time:

2023-05-21

Xiaoman is the eighth solar term among the twenty-four solar terms and the second solar term in summer. The name Xiaoman has two meanings: in the south, heavy rains begin to increase during the Xiaoman solar term and precipitation is frequent. The "man" in Xiaoman means abundant rain; in the north, there is little or no rain during the Xiaoman solar term, but the temperature will gradually rise and the wheat will gradually become fuller. "Man" refers to the fullness of the wheat.

Xiaoman is the eighth solar term among the twenty-four solar terms and the second solar term in summer. The name Xiaoman has two meanings: in the south, heavy rains begin to increase during the Xiaoman solar term and precipitation is frequent. The "man" in Xiaoman means abundant rain; in the north, there is little or no rain during the Xiaoman solar term, but the temperature will gradually rise and the wheat will gradually become fuller. "Man" refers to the fullness of the wheat.

It can be seen that during the Xiaoman solar term, there is a "high temperature and rainy" climate change. This is not an ideal working environment for dry-type transformers, which can easily cause overheating of the transformer and cause serious safety accidents. Here, the editor will analyze in detail the causes and preventive measures of dry-type transformer overheating.

Hazards caused by overheating of dry-type transformers

Dry-type transformer refers to a power transformer in which the core and windings are not immersed in insulating oil and are naturally cooled or air-cooled. Its safety performance and service life largely depend on the safety and reliability of the transformer winding insulation.

Transformer overheating has a great impact on its service life. Here we can refer to the 6-degree rule of the International Electrotechnical Commission (IEC): In the temperature range of 80-140°C, for every 6°C increase in temperature, the effective service life loss of the transformer insulation will double. Insulation aging is the main cause of overheating of dry-type transformers, which can cause damage to the transformer, short circuit fire or even explosion.
Analysis of causes of overheating of dry-type transformers

In rainy weather with high ambient temperature and high air humidity, the probability of transformer overheating will also increase. There are two main reasons:

1. The ambient temperature is higher during the rainy season, which affects the heat dissipation of the transformer. When the ambient temperature and transformer operating temperature are greater than the specified temperature rise value of the material, overheating will occur and accelerate the aging of the insulation material.

2. The rainy season is relatively humid, which can easily cause leakage accidents and also cause overheating.
In addition, summer is also the peak season for electricity consumption, and the load on electrical equipment will also increase. Coupled with the high temperature and humid environment, these reasons may also cause overheating of dry-type transformers:

1. Transformer overload operation: When overloaded, the load loss and impedance voltage increase greatly, which will accelerate the damage of the insulating material and cause overheating.

2. Inferior silicon steel sheets: Inferior silicon steel sheets will cause increased no-load loss and lead to core overheating. It is recommended to use new silicon steel sheets as transformer materials.

3. The fan and temperature controller system is damaged by moisture: Damage to the system will affect heat dissipation and cause the transformer to operate overloaded.

4. The designed operating voltage of the transformer does not match the actual operating voltage: If the voltage does not match, the saturation degree of the transformer core increases, causing an increase in no-load current and core loss, causing overheating of the transformer.

5. Multi-point grounding of the transformer core: Due to condensation or moisture, a closed loop is formed between the two grounding points and a circulating current is induced, causing local overheating of the core and destroying the insulation of the core, causing overheating.

Measures to prevent overheating of dry-type transformers

It can be seen that the harm of overheating of dry-type transformers is very serious. To prevent overheating, you can consider the following points:

1. Clean regularly: If excessive dust accumulation is found, it must be removed immediately to ensure air circulation and heat dissipation.

2. Strengthen the operation and maintenance of ventilation and temperature control equipment: ensure smooth ventilation of the transformer.

3. Strengthen temperature monitoring: detect abnormal temperatures early and deal with them early. Thermistors can be installed to achieve dual configuration of the thermostat.

4. Actively carry out moisture and dehumidification work: For dry-type transformers, surface moisture does not affect the insulation performance inside the windings. It only needs to be detected early and dehumidified before it can be put into use.

5. Check whether fasteners and connections are loose: ensure their mechanical strength and prevent multi-point grounding.

6. Actively carry out rust removal work: remove rust regularly to avoid increased losses of the transformer caused by core corrosion.
In addition, the most important point is: you must choose a regular, high-quality dry-type transformer manufacturer to ensure the reliable performance of the product! Our Leilang Electrical Appliances uses brand-new silicon steel sheet materials, H-class enameled wires and impregnated paint, combined with high-quality auxiliary materials. The products we produce are of reliable quality and excellent performance. We are your trustworthy dry-type transformer manufacturer!

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