Rapid protection device of power frequency voltage withstand system

Abstract

The invention relates to a rapid protection device of a power frequency voltage withstand system. The protection device comprises an anti-parallel thyristor circuit, a signal processing circuit and a thyristor trigger circuit, wherein the anti-parallel thyristor circuit is connected in parallel with a primary edge of a test transformer of the power frequency voltage withstand system, the signal processing circuit is connected to a voltage division device at a secondary edge of the test transformer of the power frequency voltage withstand system, the thyristor trigger circuit is connected with the signal processing circuit and used for extracting energy from a signal output from the voltage division device at the secondary edge of the test transformer through the signal processing circuit, and triggering the anti-parallel thyristor circuit which is connected in parallel to the primary edge of the test transformer to be conducted when the output signal of the voltage division device at the secondary edge of the test transformer reaches a set value, so that an over-current relay of a test system acts quickly, and a main power supply for test is cut off. In the protection device disclosed by the invention, the design without an external working power supply is adopted, the energy is extracted from the output voltage signal of the voltage division device, the external working power supply is not needed, the electromagnetic interference of a working environment where the external power supply is located is avoided, and the cost is also saved.

Description

technical field [0001] The invention relates to a fast protection device for a power frequency withstand voltage system, which belongs to the technical field of high-voltage insulation tests. Background technique [0002] In terms of power frequency withstand voltage test, power frequency withstand voltage test is to conduct insulation strength test on various electrical products, electrical components, insulating materials, etc. under specified voltage to test the insulation performance and withstand voltage ability of the product. [0003] At present, the executive element of the fast protection device actually used is the electronically controlled thyristor. By triggering the electronically controlled thyristor, the overcurrent relay is activated, and the main power supply of the test is cut off to achieve the purpose of protecting the test transformer. The working principle of this protective device is: when the arc is extinguished after the test product is discharged, t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fast protection device for power frequency withstand voltage system to solve the problem that the current fast protection device for power frequency withstand voltage test needs to use an external working power supply, which makes the protection device susceptible to electromagnetic interference and works unstable and unreliable.

Images