Permanent fault discrimination method for electric power line with shunt reactor

A permanent fault, transmission line technology, applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc.

Inactive Publication Date: 2008-08-20
XIAN XIRUI CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a permanent fault discrimination method for transmission lines with shunt reactors, which can o

Method used

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  • Permanent fault discrimination method for electric power line with shunt reactor
  • Permanent fault discrimination method for electric power line with shunt reactor
  • Permanent fault discrimination method for electric power line with shunt reactor

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Embodiment Construction

[0031]With reference to Fig. 1, there are shunt reactors at both ends of the protection circuit section MN, and the block diagram of the hardware structure of the protection device of the present invention is realized in the dotted line frame on the N side, which is composed of three parts: data acquisition system, microcomputer main system (DSP), and output system . The data acquisition system of the N-side protection device collects the three-phase voltage and current of the transmission line A, B and C, and collects the three-phase current of the shunt reactor A, B and C and the current of the small reactor at the neutral point. The voltage of the transmission line is obtained by the line-side voltage transformer TV, the current is obtained by the line-side current transformer TA1, the three-phase current of the shunt reactor is obtained by the current transformer TA2, and the current of the neutral point small reactor is obtained by the current transformer TA3. All measure...

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Abstract

The present invention relates to the field of the electric power system electric power transmission line relay protection, especially to a technique of the single-phase self-adapting reclosing with a parallel reactor electric power transmission line, and the invention discloses a method for judging the permanent fault of the electric power transmission line with a parallel reactor. The method adopts the parameter recognizing principal and constructs an identification equation which uses the circular parallel reactor and neutral point small reactor a parameter to be determined basing on the network equation when the instantaneous fault has disappeared. The solving to the inductor parameter is realized by the sound phase voltage, sound phase current, parallel reactor current and neutral point small reactor at this side. According to the least square parameter estimate redundant algorithm the inductor parameter is solved, and the instantaneous fault and permanent fault are discriminated using the comparison between the solved inductor parameter and the actual inductor parameter.

Description

technical field [0001] The invention relates to the field of relay protection for power system transmission lines, in particular to a single-phase self-adaptive reclosing technology for transmission lines with shunt reactors, in particular to a permanent fault discrimination method for transmission lines with shunt reactors. Background technique [0002] With the increase of the transmission voltage level and the increase of the insulation distance between phases, single-phase transient faults are the main fault form of EHV / UHV transmission lines, but the current single-phase reclosing action has certain blindness, whether it is Transient faults or permanent faults are automatically reclosed after a fixed time limit, resulting in reclosed permanent faults that bring a secondary impact to the power system that is more serious than a normal short circuit, which seriously threatens the safety of major electrical equipment and the safe and stable operation of the power system. ...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/06
Inventor 索南加乐邵文权宋国兵
Owner XIAN XIRUI CONTROL TECH CO LTD
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