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Novel polarization criteria realization method in non-unit distance protection

A technology of distance protection and implementation method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve problems such as threatening the safety of the power grid, being blank, and malfunctioning of double-ended quantity protection.

Active Publication Date: 2016-04-06
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the merging unit itself works abnormally due to software defects, electromagnetic interference, overheating damage, etc., it will cause double-ended quantity protection to malfunction and seriously threaten the safety of the power grid.
This phenomenon has occurred several times in the dynamic model laboratory and the field, but the current research in this area is still blank

Method used

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  • Novel polarization criteria realization method in non-unit distance protection
  • Novel polarization criteria realization method in non-unit distance protection
  • Novel polarization criteria realization method in non-unit distance protection

Examples

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Embodiment 1

[0031] The invention of this example provides a method for realizing a new type of polarization criterion in single-ended distance protection, including the following steps, such as image 3 Shown:

[0032] (1) Single-ended ranging is carried out according to the boundary conditions of the short-circuit point; the boundary condition is that the voltage and current at the fault point are in phase.

[0033] A known Because the point of failure is unknown and needs to be requested. The phase of the fault point voltage can only be approximately replaced by a single-ended electrical quantity.

[0034] (2) Make the compensation voltage U · ′ = U · - I · Z L 1 l = U · F = ...

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Abstract

The invention relates to a novel polarization criteria realization method in non-unit distance protection, and the method comprises the steps of determining a phase of a fault point voltage in non-unit distance protection; determining delta U' according to a compensation voltage; determining a non-unit range finding result that is not influenced by a load component; and determining if the fault occurs inside or outside the range based on the non-unit range finding result. The position determination speed is raised, the accuracy is improved, and the precision of non-unit distance protection is improved.

Description

Technical field: [0001] The invention relates to the field of electric power system relay protection, and more specifically relates to a method for realizing a novel polarization criterion in single-ended distance protection. Background technique: [0002] The distance protection has high sensitivity and simple structure, and it is the main protection principle widely used in transmission lines at present. With the construction of digital / intelligent substations, the electrical quantity collected by the protection device is imported from the conventional secondary cable, and then it is collected and transformed by the merging unit and then imported through the optical fiber. However, when the merging unit itself works abnormally due to software defects, electromagnetic interference, overheating damage and other reasons, it will cause double-ended quantity protection to malfunction and seriously threaten the safety of the power grid. This phenomenon has occurred several time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 刘凯波柳焕章周泽昕王兴国李仲青
Owner CHINA ELECTRIC POWER RES INST
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