Production of power transformers and protection of transformers

  In the operation of power transformers, in case of local heating, in many cases, there are no anomalies in the electric field, but first of all, the abnormal decomposition of oil and gas is manifested, that is, the oil is decomposed into gas under the local high temperature, and gradually gathered in the upper end of the transformer top and the gas relay. The difference between gas production and production speed and gas production is actually the difference between the size of overheating fault.

  1. Treatment after the action of light gas. After the light gas action signals, the sound signal should be stopped first and the number of gases in the gas relay should be checked to identify the cause.

1. The cause of non transformer fault. Such as: air intrusion into the transformer (after oil filtering); oil level down to the gas relay below (float type gas relay) or oil level drastic reduction (fender type gas relay); gas protection two circuit failures (such as gas relay junction box water, terminal row or two cable short circuit). If the action caused by external cause is determined, the transformer can continue to run after recovering the signal.

  2. Cause of main transformer fault. If it is not possible to determine the action of gas signals caused by external causes, and at the same time, no other anomalies are found, then gas protection should be put into the trip loop, and the monitoring of the transformer should be strengthened, and the development and change of the gas protection should be carefully observed.

  Two, after the action of the heavy gas protection action: the operation of the transformer in the gas protection action trip, or gas signals and gas tripping at the same time, the first consideration of the transformer has the possibility of internal faults. The treatment of this transformer should be very cautious. The gas produced in the fault transformer is very important because the different parts of the transformer indicate the nature of gas in the gas relay, the amount of gas concentration and the speed of the gas relay. Caused by different forms of overheating. Therefore, it is very important to judge the nature and severity of transformer fault.

  The gas produced in the fault transformer is very important because the different parts of the transformer indicate the nature of gas in the gas relay, the amount of gas concentration and the speed of the gas relay. Caused by different forms of overheating. Therefore, it is very important to judge the nature and severity of transformer fault.

  1, the gas accumulation is odorless and non combustible, and the reason for the gas movement is caused by the air separated from the oil. At this time, it can be judged to be the cause of the non transformer fault, and the power transformer can continue to run.

  2. Gas is flammable, and it is most likely that the transformer internal fault is caused. For this kind of transformer, it is not allowed to be put into operation before it has been inspected and tested to be qualified.

Gas protection action of power transformer is a precursor of an internal accident or an internal accident itself. Therefore, special attention should be paid to the strong delivery, commissioning and supervision of such transformers.