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In the preventive test regulations of electrical equipment, SF6 relay, the verification cycle is a key issue. According to the DL/T596-1996 Regulations for Preventive Testing of Electrical Equipment implemented by the Ministry of Electric Power on January 1,1997st, the SF6 relay should be verified regularly with a cycle of 2 years. In addition, it is recommended to perform a verification test once a year to ensure the stability and reliability of the equipment.
The inflation process of SF6 relay is used to identify some issues:
Temperature has a significant impact, making it difficult to ensure accuracy.
Using the reading on the SF6 gas cylinder, accuracy is poor and cannot be guaranteed.
When actually used in the pressure reduction process, using the inflation process for verifying the density relay does not conform to the actual application scenario, affecting accuracy.
Using the gas recovery process of SF6 equipment for verifying the density relay, the following problems exist:
Similar to the inflation process, there are accuracy issues.
A specific SF6 gas recovery device is required, which is inconvenient to operate.
To ensure the safety of verification work, the following are the precautions that need to be taken when verifying the SF6 relay:
Check the gas circuit structure of the SF6 relay to ensure gas circuit isolation.
Process the work permit to ensure orderly work.
Close the isolation valves and disconnect the check valve to ensure the accuracy of verification.
Perform alarm and interlock circuit action checks to ensure system safety.
After verification, use leak detectors to check for leaks and ensure sealing.
The verification device should be dedicated to the SF6 relay and should not be used for other pressure instruments.
Temperature should be balanced over an appropriate period of time.
Follow the verification process to ensure the entire process is sealed and safe.
The valve of the verification port should be closed first, and the valve connected to the relay should be opened later to ensure safe operation.
Record relevant information of density relays of different models and manufacturers, and establish a database.
The accuracy and reliability of the SF6 relay are directly related to the safe operation of electrical equipment. Through reasonable periodic verification and compliance with precautions, the SF6 relay can function reliably under various conditions, enhancing the safety and stability of the equipment.
