Why Do We Need to Do a Test Before Using a 10KV Vacuum Circuit Breaker?

10KV vacuum circuit breaker high voltage test, with the continuous rapid development of the power grid, 10KV oil-less circuit breaker has been withdrawn from the stage of history, replaced by the vacuum circuit breaker. Because of its high reliability and convenient maintenance, it has been widely used. But the focus of the experiment has also changed, so what experiments do we need to do?

Professionals in the industry generally know that after the gas pressure is lower than 133pa, because the number of gas molecules is small, the vacuum gap will not break down due to collisions, so the breakdown field strength is very high. In this case, we The test steps taken are usually:

1. Measure contact resistance

2. Measure the insulation resistance (one time for the fracture and the whole)

3. AC withstand voltage (one time for the fracture and once for the whole)

However, after many tests, it is found that the contact resistance of the circuit breaker is increasing year by year. After the AC withstand voltage, the insulation resistance will drop during the insulation resistance test.

Conclusion

Through the above-mentioned reason analysis and with the continuous updating of test methods, the method of vacuum degree test has been added to the previous test methods, which adds a new detection method to the test of vacuum circuit breaker. Through the accumulation of several years of test experience, we believe that the earliest test steps can no longer meet the requirements. The following steps should be done in the test before commissioning and the routine preventive test:

1. Measure contact resistance

2. Measure the insulation resistance (one time for the fracture and the whole)

3. AC withstand voltage (one time for the fracture and once for the whole)

4. Measure the insulation resistance after AC pressure (one time for the fracture and once for the whole)

5 Perform a vacuum test

As long as the circuit breaker test is done in accordance with the above aspects described by the vacuum circuit breaker manufacturer, we believe that the accident of the vacuum circuit breaker can be avoided.

Therefore, these experiments are indispensable before we use the vacuum circuit breaker initially or after maintenance.