A method of magnetic control disturbance line selection for arc suppressing coil

Abstract

The invention provides a magnetron disturbance line selecting method of an arc extinguishing coil, wherein the method relates to the field of a power grid. When a non-instantaneous single-phase grounding fault of the power grid system occurs, a conduction angle of a bridge type rectifier in a magnetic resistance control device is gradually adjusted. Saturation at an iron core magnetic valve can bequickly realized, and reactive current disturbance of the arc extinguishing coil can be quickly realized. A fact that the reactive current output from the arc extinguishing coil is higher than capacitive current of the power grid system is realized. Hereon the arc extinguishing coil is in an over-compensation state. Through comparing data of three-phase voltage over a bus before and after starting the magnetic resistance control device, a fault line is selected according to a principle that abrupt change current only flows over the fault line and increases voltage output of the fault line; and then the fault line is recovered. The method settles problems of an inter-phase shorcircuit fault and safe system operation incapability caused by an under-compensation state of the arc extinguishing device when the non-instantaneous single-phase grounding fault of the power grid system occurs.

Description

technical field [0001] The present application relates to the technical field of electric power grids, in particular to a method for selecting arc-suppressing coils using magnetic control disturbance. Background technique [0002] Single-phase grounding refers to single-phase grounding of small current grounding systems. Single-phase grounding faults are the most common faults in power distribution systems, and they mostly occur in humid and rainy weather. Due to many factors such as tree barriers, single-phase breakdown of insulators on distribution lines, single-phase disconnection, and small animal hazards, single-phase grounding not only affects the normal power supply of users, but may also cause overvoltage, burn out equipment, and even Cause short circuit between phases and expand the accident, so use 6 ～ 35kV power system single-phase ground fault protection device to detect and eliminate line ground faults in time to ensure power supply is extremely important. [...

AI Technical Summary

Problems solved by technology

[0005] This application provides a method for line selection by magnetic control disturbance of the arc suppression coil to solve the problem that when a permanent single-phase ground fault occurs in the power system, the arc suppression device is in an undercompensated state, and a phase selection error will occur. A short-circuit fault occurs between them, which affects the safe operation of the system

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