Leakage control circuit and device

Abstract

The invention discloses a bleeder control circuit and device. The circuit includes a bleeder device, a fault identification module, a bleeder state identification module and a control module, whereinthe bleeder device is composed of primary and secondary bleeder channels, the switches of the primary bleeder channel comprise a main mechanical switch and a first solid-state switch, and the switchesof a secondary bleeder channel comprise a secondary mechanical switch and a second solid-state switch; the fault identification module identifies the state of a fault branch and gives an identification result; the bleeder state identification module judges whether overcurrent happens to the bleeder device and gives a judgment result; and the control module controls the mechanical switch to be conducted when the identification result is not relief, after the mechanical switch is conducted and the identification result change to already relief and the judgment result is not overcurrent, the secondary mechanical switch on each channel is disconnected and the second solid-state switch is conducted in sequence, the second solid-state switch in the channel is later controlled, and disconnectionof the main mechanical switch and conduction of the first solid-state switch are controlled in sequence. Through hardware circuit structure setting, generation of arcs of the mechanical switch is reduced, and quick removal of the bleeder device is facilitated.

Description

technical field [0001] The invention relates to the field of circuit electronics, in particular to a leakage control circuit and device. Background technique [0002] With the continuous expansion of the grid scale, the continuous increase of the degree of interconnection and the continuous operation of large-capacity units, the short-circuit fault current in the modern power system continues to increase. In order to reduce the harm caused by the short-circuit fault current, the traditional method mainly relies on the installation of a fault current limiter to limit and restrain the short-circuit current. However, since the installation of the fault current limiter is connected in series, the actual Increased energy loss in transmission lines. Therefore, although the current fault current limiter reduces the harm caused by the short-circuit fault current, there are actually other problems that affect the energy consumption and economic operation of the power system. [000...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a discharge control circuit and device, aiming to solve the technical problem that the use of the discharge device to discharge the electric arc is caused by the addition of a mechanical switch, which is not conducive to the rapid removal of the discharge device.

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