Transformer four common faults
Power energy has been throughout all aspects of people's daily life, indispensable in people's life and production, so it is necessary to do a good job of routine maintenance and overhaul of the power system.
Power transformer is the key equipment in the grid security system, and most of the power transformers currently in operation have aging and failure problems, if a power accident occurs, the harm is great, power outages will seriously affect people's daily life, but also cause huge economic losses, if the power outage for a long time, it is possible to affect the stability of the community, the scope of the wide range of the impact, so do a good job in the power voltage apparatus maintenance and overhaul work .
Four common transformer failure
1. Transformer oil leakage
Transformer oil leakage is one of the common faults of power transformers, the fault often affects the normal operation of the transformer, leakage out of the oil will pollute the environment, but also cause greater economic losses, the situation is serious and even power system shutdown. Therefore, once the transformer faults need to be disposed of in a timely manner to avoid greater harm.
This type of failure according to its oil leakage location can be divided into different reasons. Transformer oil leakage generally appears in the tank weld oil leakage, low voltage side casing oil leakage and explosion-proof tube oil leakage. The reason for this failure may be due to the tank in the welding operation is not standardised, resulting in premature oil leakage tank; high-voltage casing elevated seat position using rubber pads, so that the flange connection cracks, and cause oil leakage; transformer low-voltage side of the busbar due to stretching and the lead wire is too short, so that the glue beads pressed in the threads will also cause oil leakage.
2. Joint overheating
Current-carrying joints are connected to the transformer and other components of the bridge, current-carrying joints of the operation of the transformer directly affects the operating efficiency of the actual use of the current-carrying joints are prone to overheating, generally due to a break in the transformer and the connection of the lead section of the existence of a potential difference, which generates heat and cause major safety accidents; in addition, the joints of the transformer impurities may also appear in the case of heat, or Joints in the conductive paste film with the extension of time gradually thin, will also occur in the case of heat; oil-immersed transformer conductive sealing head due to sealing incomplete use of the current-carrying joints loose or sticky, will also produce heat.
3. Iron core multi-point grounding
Transformer use can be used in one point grounding and multi-point grounding two ways, the actual use of transformer multi-point grounding will produce a current loop, resulting in iron core failure, and lead to localised heating, transformer oil decomposition and core silicon steel sheet deformation, making it difficult for transformers to carry out normal and safe operation.
4. Transformer moisture
Transformer moisture may be due to the transformer internal parts there is moisture leakage, external moisture extension pipeline and accessories into the mailbox or the presence of moisture in the insulating oil. Transformer moisture will affect its insulation and the safe operation of the transformer.