Arc extinction grounding device

Abstract

The invention discloses an arc extinction grounding device. The arc extinction grounding device comprises an electric reactor, a current conversion chain, a phase-shifting transformer, a main controller, a voltage transformer and a current transformer. The main controller collects the voltage of a neutral point of a power grid by the voltage transformer, calculates the voltage output by the current conversion chain according to the collected voltage, and transmits a corresponding motion signal to control the voltage which is actually output by the current conversion chain to control the compensating current which is injected by the arc extinction grounding device to the power grid, so as to extinct arcs. The current conversion chain is used, and the compensating current is controlled by adjusting the output voltage of the current conversion chain, so that compared with traditional technical means, the arc extinction grounding device has the advantages of high compensating speed and precision; and moreover, electric reactors and capacitors which are large in capacity are eliminated, so that the running loss of the arc extinction grounding device is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of distribution network grounding, in particular to an arc suppression grounding device. Background technique [0002] The arc suppression coil is a grounding device widely used in distribution network (6kV, 10kV and 35kV power grid). The capacitive current reduces the grounding current at the fault point, reduces the initial speed and rising speed of the grounding arc recovery voltage, and achieves the purpose of extinguishing the arc. [0003] At present, the arc suppressing coils used in the market can be divided into air-gap-adjusting type, turn-adjusting type, capacity-adjusting type and thyristor-adjusting type according to the principle and structure. Among them, the air-gap adjusting type has been gradually Out of use, the turn-adjusting type and the capacity-adjusting type cannot be continuously adjusted. Although the adjustable thyristor type can be continuously adjusted, a filter device needs to ...

AI Technical Summary

Problems solved by technology

[0003] At present, the arc suppressing coils used in the market can be divided into air-gap-adjusting type, turn-adjusting type, capacity-adjusting type and thyristor-adjusting type according to the principle and structure. Among them, the air-gap adjusting type has been gradually Out of use, the turn-adjusting type and the capacity-adjusting type cannot be continuously adjusted. Although the adjustable thyristor type can be continuously adjusted, a filter device needs to be installed, and the dynamic response speed is limited by the frequency of the power grid.

In addition, the above technical solutions all use large-capacity passive devices, which easily lead to grid resonance and large losses

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