Magnetic controlled shunt reactor exciting winding casing tube flashover detecting method and circuit

A technology of excitation windings and reactors, which is applied in the direction of emergency protection circuit devices, instruments, and measuring circuits. It can solve problems such as large short-circuit impedance, difficulty in detecting faults, and inability to protect reactors. It achieves simple configuration, low insulation level requirements, The effect of low detection cost

CN101272049BActive Publication Date: 2011-06-01CHINA ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-06-01

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Abstract

The invention relates to a flashover detecting method and circuit for the bushing of the excitation winding of a magnetic control shunt reactor. The method of the invention includes the following steps: 1) mounting a circuit sensing element at the point grounding location of an overvoltage protection loop of the magnetic control shunt reactor; 2) judging to be normal when no circuits are detectedby the circuit sensing element; 3) judging that the bushing of the excitation winding has a direct earth flashover fault when a circuit is detected by the circuit sensing element. The method can detect the fault circuit at the point grounding location of the overvoltage protection loop through the circuit sensing element no matter the flashover fault happens at any place of the bushing of the excitation winding; therefore, the invention is simple to be collocated; the level requirement on the insulating location is low; the detecting cost is low; the invention has great significance for the industrialization development of the magnetic control shunt reactor.
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Description

technical field

[0001] The invention relates to a relay protection detection method and circuit, in particular to a magnetically controlled shunt reactor excitation winding bushing flashover detection method and circuit. Background technique

[0002] In ultra-high voltage and ultra-high voltage power grids, controllable reactors can effectively solve the contradiction between limiting overvoltage and reactive power compensation. They are indispensable technical means for ultra-high voltage and ultra-high voltage power grids, and have broad application prospects. The magnetically controlled shunt reactor changes the magnetic saturation degree of the iron core by changing the magnitude of the DC excitation current, so that the reactance value can be adjusted continuously, smoothly and quickly, so it has very superior control performance. However, since the magnetic control shunt reactor is a high-impedance transformer type, the short-circuit impedance is very large (it can be ...

Examples

Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0011] Such as figure 1 As shown, the core structure of the magnetic control shunt reactor is special, which is a single-phase four-column structure, and each core column is coaxially wound with a primary winding (ie, the grid side winding) and a secondary winding (ie, the field winding); the magnetic control type The shunt reactor has a special wiring method. The grid side winding is connected to the grid in a star connection. After each branch of the field winding is connected in a delta, the two open triangles are connected in antiparallel, and then connected to the DC field branch. Such as figure 1 Shown, L A1 , L B1 , L C1 , L A2 , L B2 , L C2 Respectively, the grid-side branch windings of each single-phase reactor, L a1 , L b1 , L c1 , L a2 , L b2 , L c2 are the excitation branch windings of each single-phase reactor, B a1 , B b1 ...