Fault distance-finding method for nonuniform zero sequence mutual inductance same-lever aerial multi-back line

A technology of zero-sequence mutual inductance and fault location, which is applied to fault locations, emergency protection circuit devices, electrical components, etc., and can solve the problems that the fault location method is no longer applicable

Inactive Publication Date: 2009-01-21
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

However, in practice, the above-mentioned ideal situation is usually not the case. Only a certain part of the line is paralleled on the same pole. ...

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  • Fault distance-finding method for nonuniform zero sequence mutual inductance same-lever aerial multi-back line
  • Fault distance-finding method for nonuniform zero sequence mutual inductance same-lever aerial multi-back line
  • Fault distance-finding method for nonuniform zero sequence mutual inductance same-lever aerial multi-back line

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Embodiment Construction

[0034] The technical solution of the present invention will be further described in detail according to the accompanying drawings in the specification.

[0035] The invention discloses a method for fault distance measurement (location) aiming at uniform and non-uniform zero-sequence mutual inductance and multi-circuit lines (including double-circuit lines) erected on the same pole with different voltage levels or in the same transmission corridor. The method is based on distribution parameters Model, fault location (localization) method using voltage and current samples sampled simultaneously at both ends. figure 1 Shown is the circuit model of a single-circuit uniform transmission line, where R0 represents the resistance per unit length (Ω / km), L0 represents the inductance per unit length (H / km), and G0 represents the conductance between wires per unit length (S / km ), C0 represents the conductance (F / km) between wires per unit length. Then the voltage-current equation of a ...

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Abstract

The present invention discloses a failure distance-measuring method of uniform and non-uniform zero-sequence mutual inductance and multi-loop circuit with loops of different voltage levels arranged on the same rod or with the same electricity-transmitting corridor. Based on a distributed parameter model, the method samples the voltage and current synchronously at two ends. As for the parallel multi-loop circuit with the loops arranged on the same rod and with the same electricity-transmitting corridor, the influence of mutual inductance of the positive sequence and negative sequence between the loops can be ignored. When the power line has a single-line or over-line failure, the positive-sequence voltage and the negative-sequence voltage, which are respectively calculated from two sides of the fault point, should be equal to the sum of the positive-sequence voltage and the negative-sequence voltage, so as to solve the fault distance equation based on the positive-sequence component, negative-sequence component, or the positive-sequence and negative-sequence component. When the protection indicates that the line has an internal failure, the failure distance can be measured according to the fault distance equation. The mutual inductance between the lines which can be even or uneven has no influence on the distance measurement of the loops arranged on the same rod. The method can be used for precise distance measurement of the loops arranged on the same rod, which have various topological structures.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a fault location method for multi-circuit lines erected on the same pole with non-uniform zero-sequence mutual inductance. Background technique [0002] With the development of the electric power industry, the voltage level and transmission capacity of transmission lines are gradually increasing, and the precise distance measurement technology of transmission lines has been paid more and more attention by people. The research on distance measurement methods has become one of the hot research topics in power systems. Accurate and fast fault location can help to analyze the fault after the event, so as to eliminate the cause of the fault in time. [0003] The multi-circuit line on the same pole is more and more widely used in high-voltage power transmission and distribution projects. It can well solve the problems of insufficient corridor ...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 徐振宇田文辉黄少锋余胜许刚
Owner BEIJING SIFANG JIBAO AUTOMATION
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