1. Overvoltage

 

(1) struck by lightning.

 

Baoding oil-immersed transformer of high and low pressure line most introduced by overhead lines, especially for places where is located in the mountain forest, is a good chance of lightning, the thunderstorm season of a year, lightning strike damage percentage of oil-immersed transformers accounts for more than 30% of major repair.

 

(2) ferromagnetic resonance occurs in the system. This is the cause of the power system, generally rural 10 kv distribution line form overvoltage condition, the system resonance overvoltage, a current transformer, at this time in addition to the transformer primary side fuse fusing, will damage the transformer winding. In some cases, the casing of the transformer is also caused by flashover or explosion.

 

2. Insulation damage.

 

(1) the rapid increase of low voltage circuit fault and load, make oil-immersed transformer current more than several dozen times the rated current, then the affected by a lot of electromagnetic torque winding and displacement and deformation. Due to the rapid increase of current, the temperature is rapidly increased, leading to the accelerated aging of insulation.

 

(2) insulation of windings. This is due to the poor quality of the insulation or the lower oil level. One is that the storage and transportation of transformer insulating oil are not in place, which may make the oil impure and the oil quality greatly affected. The second is that the winding inside of the winding is not transparent, dry and incomplete, the winding leads are not welded properly, and the insulation is not complete, which leads to the short circuit between turns and layers. The third is to reduce the oil surface to increase the contact surface of the insulating oil and air, and to accelerate the moisture in the air into the oil, which will also reduce the insulation strength. When the insulation is reduced to a certain value, a short circuit will occur.

 

3. Tapping switch.

 

(1) the oil-immersed transformer is oil-soaked, and the tapping switch is exposed to the air, and the performance will decrease after the insulation is damp, which will cause the discharge short circuit and damage the transformer.

 

(2) excessive oil temperature. The oil in baoding oil immersed transformer is mainly the function of insulation, heat dissipation and moistureproof. Excessive oil temperature in transformer will directly affect the normal operation and service life of the transformer.

 

The above three factors are the possible causes of oil-immersed transformer burn, burn, in order to be able to effectively prevent the transformer in daily operation and maintenance can be focused on to deal with these three aspects, hope through the above introduction can provide to all of you to help.

Billion in baoding electric materials co., LTD is specialized in the production of transformer baoding transformer factory manufacturers, with professional production equipment, hoisting, tooling and testing equipment, established a perfect quality management system, product performance indicators have reached the standard.

 

Company's main products: baoding dry type transformer, baoding box transformer, baoding oil immersed transformer, baoding high and low voltage complete equipment. I companies to follow "detail decides success or failure, honesty molded the future" of the enterprise purpose, adhere to "quality measuring market, seek development by innovation, to management for efficiency" business philosophy, to make my company's products are widely used in power plant, chemical, construction, mining, metallurgy, rail transportation and other industries, to meet the needs of various users, my company rely on superior product quality, thoughtful service, won the trust of our customers.