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Computing method for cross circuit ungrounded fault points of parallel circuits

A ground fault, calculation method technology, applied in the direction of the fault location, etc., to achieve the effect of solving the problem of accurate measurement

Inactive Publication Date: 2014-03-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a calculation method for cross-line ungrounded fault points of parallel lines, which is used to solve the problem of accurate measurement of fault parameters of parallel line cross-line ungrounded faults

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  • Computing method for cross circuit ungrounded fault points of parallel circuits
  • Computing method for cross circuit ungrounded fault points of parallel circuits
  • Computing method for cross circuit ungrounded fault points of parallel circuits

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Embodiment Construction

[0037] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0038] figure 1 is a schematic diagram of a parallel line cross-line ungrounded fault, such as figure 1 As shown, the parallel circuit is composed of two circuits. For the convenience of description, the present invention marks the two circuits as I-circuit and II-circuit respectively. figure 1 M and N in represent the two sides of the parallel double-circuit line respectively, and Z MS1 and Z MS0 Denote the positive sequence impedance and zero sequence impedance of the M-side system respectively, Z NS1 and Z NS0 Represent the positive-sequence impedance and zero-sequence impedance of the N-side system, respectively. In this embodiment, the distance protection is set to be installed on the M side of the I-circuit...

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Abstract

The invention discloses a computing method for cross circuit ungrounded fault points of parallel circuits in the technical field of power system relay protection. The computing method includes the steps: acquiring instantaneous values of voltage and current of a circuit distanced from the protection position; computing relevant parameters a1, b1, a2, b2, a3 and b3 according to cross circuit ungrounded fault conditions; computing the fault points, fault impedance, fault reactance and fault path resistance of cross circuit ungrounded faults according to the relevant parameters. Only by the aid of single-ended voltage and current of the protected circuit in the parallel circuits, the method can effectively and accurately measure the cross circuit ungrounded fault distance in the parallel transmission circuits.

Description

technical field [0001] The invention belongs to the technical field of relay protection for power systems, and in particular relates to a [0002] Calculation method of ground fault point. Background technique [0003] Transmission line is the basic equipment for power generation and transmission in the power system, and occupies a very important position in the power system. When the transmission line is faulty, if it cannot be cut off in time or by mistake, it will have a great impact on the main system, and it will easily cause major accidents such as grid splitting and transformer tripping. The protection device of high-voltage / ultra-high voltage / ultra-high voltage parallel transmission lines is responsible for the important task of power transmission and is an important hub of the power system. They are extremely expensive to manufacture, and once they are damaged due to malfunctions, they will be difficult to repair and take a long time, causing huge direct and indir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 徐振宇苏靖棋张旭孟江雯
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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