Common Problems and Solutions of SF6 Switch in Substation Maintenance

SF6 circuit breaker switches have been widely used in power systems, with the advantages of strong arc quenching efficiency and good cycling performance, which reduces the risks of distribution network operation. During the maintenance of distribution systems, the maintenance of SF6 load break switches is very important. Due to a series of problems such as gas leakage and pressure faults that may occur during the operation of SF6 circuit breakers, it is necessary to regularly maintain them to ensure their normal operation and the safe and stable operation of electrical equipment circuits.

Faults of SF6 Load Break Switches

When SF6 circuit breakers are in operation, SF6 gas is often present in the operating environment of SF6 circuit breakers, and it is easy to absorb moisture from the gas, causing condensed water on the surface of SF6 circuit breaker switches. This can lead to flashover on the surface of SF6 circuit breaker switches, which is of great importance to the safety of SF6 circuit breaker switches. The SF6 gas in the circuit breaker can also produce corrosive gas and high temperature during chemical reactions. For aluminum materials, SF6 gas has strong corrosiveness, and it also poses a great threat to ceramic insulation materials, phenolic resin layers, and other compounds. It can be seen that SF6 gas poses a great threat to the internal or external parts of the circuit breaker. If the circuit breaker works for a long time under this environment, it will cause great damage to the internal or external parts of the circuit breaker, leading to the failure of the SF6 circuit breaker switch.

During the maintenance of SF6 load break switches, it is necessary to detect the moisture content of the switches, ensure that the gas will not corrode the internal components of the SF6 circuit breaker switch. Moreover, the internal temperature of the SF6 circuit breaker switch is relatively high, which may cause aging of the internal components and even tripping, resulting in problems with the entire power supply circuit. Therefore, during equipment maintenance, the signal poles of the SF6 circuit breaker switch need to be cleaned and tested regularly, and the sealing elements need to be replaced in time to prevent gas leakage inside the SF6 circuit breaker switch, which can cause faults in the opening and closing of the SF6 circuit breaker switch and improve the stability and safety of the SF6 circuit breaker switch. Collaboration with manufacturers specializing in 11kv auto recloser can aid in the effective maintenance and troubleshooting of SF6 load break switches.

Tripping Problem of SF6 Load Break Switches

Load accidents caused by tripping of SF6 circuit breakers will lower the safety of power supply and usually take the following forms:

If there is a secondary circuit problem caused by human factors, it is necessary to immediately stop the operation, evacuate all on-site personnel, report the specific situation to the relevant responsible persons, and, after unified dispatch, promote the SF6 circuit breaker to return to normal operation as soon as possible. Detailed inspection of the safety measures is required to prevent personnel from touching it. After making adequate safety preparations, continue to carry out various work in the secondary circuit.

If it is caused by human error and the SF6 circuit breaker trips, do not close it without authorization, and report the specific information to the dispatch unit, and promote the SF6 circuit breaker to return to normal operation as soon as possible according to the relevant dispatch instructions. If there is a problem with 3-phase tripping, the synchronous device can be put into use for the synchronous closing. If there is no synchronous closing device, the closing operation can be carried out after confirming that there is no problem with the parallel connection.

If it is caused by component damage, secondary circuit short circuit, and DC contact, which may cause the circuit breaker to trip, it is necessary to lower the control switch at the first time, effectively isolate the DC ground connection, submit an application, transfer the load to other equipment, and then completely disconnect the isolation switch on both sides of the SF6 load break switch. After implementing the inspection work under the overall power-off and relevant safety measures, the fault problem can be found and solved before the SF6 circuit breaker can resume normal operation. It is crucial to collaborate with manufacturers specializing in 33kv load break switches to ensure proper troubleshooting and maintenance of the circuit breaker.

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