Arc extinction device for eliminating interphase short circuit in single-resistance method

Abstract

The invention discloses an arc extinction device for eliminating interphase short circuit in a single-resistance method. The arc extinction device comprises a contact switch K1, a contact switch K2, a contact switch K3, a grounding bar PE1, a current transformer CT, metal resistors R1 and a contact switch K4. One ends of the contact switch K1, the contact switch K2 and the contact switch K3 are connected together to form a node N1, and the other ends of the contact switch K1, the contact switch K2 and the contact switch K3 are respectively connected with a phase A, a phase B and a phase C of a 6-35kV bus. The metal resistors R1 are connected in parallel at the two ends of the contact switch K4 to form a node N2 and a node N3 at the two corresponding ends, the current transformer CT is connected between the node N1 and the node N2 in a penetrating mode, the and the node N3 is connected to the ground through the grounding bar PE1. When failures of an external system comprising the arc extinction device occur, the contact switch K1, the contact switch K2 and the contact switch K3 corresponding to the failures are controlled to be turned on, and before the turning on, the contact switch K4 must be turned off, and the metal resistors R1 are used for restraining system short circuit or grounding currents.

Description

technical field [0001] The invention relates to an arc-extinguishing device, in particular to an arc-extinguishing device which adopts a single-resistance method to solve interphase short circuit. Background technique [0002] The single-phase grounding fault grounding current transfer device starts the vacuum contactor of the grounding phase when a single-phase grounding occurs, and transfers the current at the fault point to the vacuum contactor, so that the current at the fault point can be reduced to the minimum, so as to extinguish the arc and effectively prevent Shoot at the point of failure. When manually removing the fault, it is necessary to manually reset the fault phase to get the vacuum contactor, but the existing technology and method, the software fault phase judgment cannot be 100% correct, and the high-voltage fuse in the arc suppression cabinet is precisely to prevent phase judgment errors And set. However, once the phase judgment is wrong, it will cause a...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and provide an arc suppression device that uses a single resistance method to solve interphase short circuit, which solves the problem of interphase short circuit of the arc suppression device or the arc light overvoltage switch closed period. A defect that causes the system to exit operation due to fusing

Images