1. Definition and function of power frequency withstand voltage and induced withstand voltage
Power frequency withstand voltage refers to the highest voltage value that a transformer can withstand under specific working conditions, which can also be said to be the insulation strength of the transformer. Induced withstand voltage refers to the highest voltage value applied by the cables and equipment downstream of the circuit breaker after the transformer is turned off, also known as the switch voltage.
Power frequency withstand voltage and induced withstand voltage are important indicators for measuring the insulation capacity of transformers. Its main function is to ensure that transformers do not experience insulation breakdown and equipment damage during operation, while also reducing equipment failure rates and improving equipment reliability and safety.
2. The difference between power frequency withstand voltage and induced withstand voltage
In practical applications, although both power frequency withstand voltage and induction withstand voltage are used to measure the insulation capacity of transformers, there are some differences in their measurement methods, testing methods, testing instruments, and testing conditions.
① Measurement method
The power frequency withstand voltage is mainly tested using an AC high-voltage tester. During the test, each winding of the transformer needs to be short circuited. After observing the stable current, the voltage gradually increases until it reaches the set value. The induced voltage withstand test requires the use of a G ö del insulation measuring instrument for testing, which is mainly conducted downstream of the circuit breaker, at the tester end, and at the equipment end to observe whether the voltage is qualified in a short period of time.
② Testing method
When conducting power frequency withstand voltage tests, it is necessary to place the transformer in a vacuum environment so that the voltage at both ends can withstand a constant value. When conducting induced voltage withstand tests, it is necessary to disconnect the cables and equipment in order to detect the maximum voltage value that the cables and equipment downstream of the switch can withstand.
③ Testing instruments
The power frequency withstand voltage test mainly uses testing instruments such as high-voltage AC generators, capacitance data meters, and digital recorders, while the induction withstand voltage test mainly uses insulation instruments such as Goethe insulation measuring instrument.
④ Test conditions
When conducting power frequency withstand voltage tests, it is generally necessary to conduct long-term and high voltage tests, while induction withstand voltage tests usually only require short-term and low voltage tests.
3. Conclusion
In summary, although both power frequency withstand voltage and induction withstand voltage are used to measure the insulation capacity of transformers, there are significant differences in their testing methods, instruments, and conditions. Therefore, when measuring the insulation performance of transformers, it is necessary to combine the specific actual situation, choose appropriate testing methods and instruments, improve the accuracy and reliability of testing, and ensure the safe operation of transformers.
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