Transient overvoltage test circuit and transient overvoltage test equipment

Abstract

The invention discloses a transient overvoltage testing circuit and transient overvoltage testing device. The transient overvoltage testing circuit comprises a gas discharge tube, a first power supply module used for a first power supply, at least one second power supply module used for a second power supply, and a switch isolation circuit. The switch isolation circuit comprises a first input end, a second input end and an output end. The first input end of the switch isolation circuit is connected with an output end of the first power supply module, the second input end of the switch isolation circuit is connected with an output end of the second power supply module, and the output end of the switch isolation circuit is connected with the gas discharge tube. The switch isolation circuit is used for isolating the first power supply module from the second power supply module and carrying out parallel outputting. By adopting the transient overvoltage testing circuit, the transient overvoltage testing cost of the gas discharge tube is lowered.

Description

technical field [0001] The invention relates to a transient overvoltage testing circuit and transient overvoltage testing equipment. Background technique [0002] When the power system is running normally, the electrical equipment works at the rated voltage. However, due to lightning, improper operation, equipment failure or improper parameter setting, etc., the voltage of some parts of the power system will suddenly rise and multiply. If the ground exceeds its rated voltage, this voltage increase is called transient overvoltage, also known as TOV (Transient OverVoltage). If this transient overvoltage is not discharged in time, it will cause damage to the equipment. [0003] At present, in order to prevent transient overvoltage damage to electrical equipment, a gas discharge tube is usually installed in the protection circuit inside the electrical equipment. When the transient overvoltage exceeds the breakdown voltage of the gas discharge tube, the gas discharge tube conduct...

AI Technical Summary

Problems solved by technology

This kind of test theoretically requires the minimum power of the test equipment to be 360KVA (kilovolt / ampere), and the power capacity of the general factory will basically not exceed 200KVA, it is difficult to complete the self-test, so most factories generally use the gas discharge tube Send it to a professional testing agency for testing, and the testing cost of a professional testing agency is relatively high, and the transportation back and forth is time-consuming and laborious

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