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A Realization Method of Polarization Quantity Criterion in Single-ended Quantitative Distance Protection

A technology of distance protection and realization method, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of blank, double-ended quantity protection malfunction, threat to power grid security, etc., to speed up the determination speed and accuracy, The effect of improving overall motion performance, enhancing accuracy and determining time

Active Publication Date: 2020-05-12
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Realization Method of Polarization Quantity Criterion in Single-ended Quantitative Distance Protection
  • A Realization Method of Polarization Quantity Criterion in Single-ended Quantitative Distance Protection
  • A Realization Method of Polarization Quantity Criterion in Single-ended Quantitative Distance Protection

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Embodiment 1

[0031] The invention of this example provides a method for realizing the polarization quantity criterion in single-ended quantity distance protection,

[0032] Include steps such as image 3 Shown:

[0033] (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.

[0034] 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.

[0035] (2) Make the compensation voltage

[0036] Among them: Z L1 Positive-sequence impedance of the line, l=a real number from 0 to 1, where, when the phases are short-circuited When shorted to ground

[0037] (3) get

[0038] (4) In order to make the calculation result not affected by the load component, it is necessary to remove The impact on ranging accuracy, the singl...

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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 particularly relates to a method for realizing polarization quantity criterion in single-end measurement 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(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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