Fault judgment and grounding line selection method for arc suppression coil grounding mode

Abstract

The invention discloses a fault judgment and grounding line selection method for an arc suppression coil grounding mode, and the method comprises the steps: carrying out the compensation arc extinction of a grounding fault through an arc suppression coil when a power grid normally operates in the arc suppression coil grounding mode and the power grid has a single-phase grounding fault, and enabling the fault to be eliminated after the arc extinction compensation if the fault is an instantaneous fault; if the fault is a permanent fault, that is, if the grounding fault is still not eliminated after a certain time T, dynamically converting the grounding mode into a non-grounding mode, and selecting a grounding fault line through a feeder zero-sequence current increment method.

Description

technical field [0001] The present invention is mainly in the field of neutral point grounding of distribution network, especially a fault judgment and grounding line selection method for arc suppression coil grounding mode, which is used to solve the fault judgment of distribution network neutral point arc suppression coil grounding mode and ground wire selection. Background technique [0002] When a single-phase ground fault occurs in the distribution network compensated by the arc suppression coil, the zero-sequence current flowing through the fault line is the residual current after compensation by the arc suppression coil, and the zero-sequence current flowing through the non-fault line is the line-to-ground fault. Capacitive current, affected by the difference in the tuning of the arc suppression coil and the difference in the capacitance current of each line, the zero-sequence current of the faulty line and the non-faulty line has no regularity, and the zero-sequence ...

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Problems solved by technology

[0004] Aiming at the problems existing in the neutral point grounding of the current distribution network, the present invention invents a fault judgment and grounding line selection method for the grounding mode of the arc suppressing coil. Gate K and switch QF L series, switching QF L Next to the neutral point voltage transformer TV connected in parallel N , switch QF L The secondary side of the arc-suppression coil is connected to the arc-suppression coil branch, and the arc-suppression coil branch is composed of an adjustable reactor L and a damping resistance R Z Composition, the resistance branch is connected in parallel next to the arc suppressing coil branch, and the resistance branch is connected by the switch QF R connected in series with a resistor R to ground to form

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