A few simple and practical maintenance tips for oil immersed transformers
Writer： Hengfeng you electric Time：2023-04-04 views：times
Transformer oil is a kind of petroleum liquid, which has the possibility of combustion and has shortcomings in environmental protection. However, due to the excellent performance and low price of transformer oil, most power transformers still use transformer oil as insulation and cooling medium. So how to maintain and preserve oil immersed transformers? Today,
Hengfengyou Electric Engineer will explain in detail to everyone.
(1) Disconnect the low-voltage side circuit breaker of the transformer to be maintained, pull down the isolation switch, and hang the corresponding signboard on the handle
(2) Disconnect the load switch on the high-voltage side of the transformer, confirm that it is in the disconnected position, close the grounding switch, and complete the safety of the switch and hang relevant signs
Is it normal? If there is oil leakage, the rubber pad should be replaced
Check if the silicone is effective. If there is discoloration or serious failure, it should be replaced immediately.
(4) Retighten the lead terminals, pins, and grounding screws into the wire screws. If there is any looseness, remove the screws and lightly file the contact surface with a fine flat file
After touching without any unevenness, use a clean cloth to wipe off the dust, apply Vaseline, replace with a new spring pad, and tighten the screws.
(5) Check whether the lighting, heat dissipation, and dust removal equipment around the transformer are in good condition, and use a clean cloth to wipe off the dust on the transformer body and porcelain bottle.
(6) Check the high-voltage side load switch of the transformer to ensure that
(7) Measure the total insulation resistance (to ground and between phases) of the high and low voltage lines of the transformer using a 2500 megger to confirm compliance with the requirements (at room temperature of 30 ° C, 10KL
The high voltage side of the transformer is greater than 20Mg, and the low voltage side is greater than 13Mg. Before the test, the grounding wire should be connected properly, and after the test is completed, discharge should be carried out.
(8) Check if there are any tools left in the transformer room and transformer, and after they are correct, close the high-voltage side isolation switch and raise it on site.
(9) Open the high-voltage grounding switch, check that the grounding is in the disconnected position, and then close the high-voltage load switch
Side sign board, please note that there must be at least two people on site when disconnecting or closing the high-voltage load switch of the transformer.
(10) The maintenance procedures for kilowatt transformers are similar to those for oil immersed transformers
Precautions for maintenance of transformers
(1) Ensure that the transformer operates in a non corrosive environment, with an ambient temperature between -30 ° C and+40 ° C, and a wind speed not exceeding
At 350 meters per second, if a high-voltage load switch is installed on the high-voltage side of the transformer, the operator should short-circuit the three-phase of the transformer side and keep operation records at any time.
(2) Transformer high-voltage operators should wear insulated shoes
Gloves.
(3) Prevent reverse power transmission to the transformer and discharge to the busbar during transformer operation.
Maintenance precautions for oil immersed transformers
Oil immersed transformer is a very good and suitable transformer that plays a huge role in industrial production and construction, and is used in many fields and industries. I believe many people are concerned about how to store oil immersed transformers properly!
Seen from the various performances of oil immersed transformers, they are basically stable, but the oil immersed transformers mainly use transformer oil, so they are relatively low in technology and simple in function. However, the preservation of oil immersed transformers is also a key issue. Many enterprises do not properly keep the oil immersed transformers, resulting in machine damage and function degradation, so preservation is very critical!
According to the user introduction of long-term contact with oil-immersed transformers, is the storage environment mild in nature and can seriously affect performance and efficiency. The basic guarantee is to operate an oil immersed transformer in a clean and dry indoor environment, which is not suitable for any location. Once the environment is harsh, it will directly lead to inaccurate output data, seriously affecting future normal operation.
