Transformer protection misoperation pressure release case studies

Main transformer pressure relief protection, as important non- power transformer protection , depending on the fuel tank body release valve micro switch to achieve. That is when the oil inside the device accidents , oil tank is vaporized , producing large amounts of gas , so that a sharp increase in pressure inside the tank . When the tank pressure  power transformers opening pressure rises to its micro switch quickly closed, while the rapid release valve opens within 2ms, so the tank pressure rapidly decreases, while its micro switch quickly closed, turned tripping circuit , broken open each side of the transformer circuit breaker .  electric transformer  the deformation of the transformer tank , or even burst. However, the actual operation, the transformer pressure relief protection malfunction accidents often occur. Shandong SISHUI ​​power company belongs 110kV substation Kim Chong , occurred because of the pressure relief protection transformer malfunction , each side of the transformer circuit breaker tripped , causing power loss of pressure in the station accident . Kim Chong 110kV substation is an important hub for the western grid substation Surabaya . Powered by 110kV and 110kV lines Jinzhuang song Si line, the bridge connection , a single mother of segmented , double main transformer mutual standby operation.