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Method for judging and analyzing of sectionalized single bus connection differential protection of power systems

A single-bus section and differential protection technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of high operational ability requirements of operators, poor reliability and accuracy, and high complexity of work, and achieve technical The effect of lower level requirements, higher accuracy, and simpler work

Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The invention effectively solves the problems of poor reliability and accuracy of the analysis results, high requirements on the professional ability of operators, high work complexity and low work efficiency during manual operation of traditional relay protection line wiring analysis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The specific process of wiring analysis is as follows:

[0041] 1. Get measured values ​​and parameters:

[0042] Obtain the effective value and phase of the current (A, B, C, N) of each line of the differential protection line of the single-bus segment connection through instrument measurement. A reference voltage needs to be selected during measurement, and the current phase of all lines to be measured refers to the phase of the measured current relative to the reference voltage. The reference voltage can be selected by the operator during the measurement. Once the reference voltage is selected, it cannot be changed before the measurement is completed.

[0043] Enter the single bus section wiring parameters before performing the analysis.

[0044] For single-bus section wiring differential protection lines: including the CT ratio of each line, the single-bus section wiring where each line is located, the power supply mode of each line, and the number of each line (f...

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PUM

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Abstract

The invention provides a method for analyzing and judging whether sectionalized single bus connection differential protection connection of power systems is correct or not in order to solve the problems of time and effort wasting resulted from manually judging the condition of errors of sectionalized single bus connection differential protection connection of power systems and high requirement for workers at present. The method has the advantages of high reliability, safety and simpleness in use and convenience in operation. The method mainly comprises the steps of measured value and parameter acquisition, current conversion, correctness correction and judgment after correction, conclusion output, verification and conclusion of the basic theory of algorithms (under the condition of amplitude balance) and the like. The method has the advantages of reliable analysis results, substantial improvement of accuracy, simpleness in operation and safety and reliability.

Description

technical field [0001] The invention relates to a method for analyzing circuit wiring of a power system, in particular to a method for judging and analyzing the wiring of a CT circuit of a single busbar segmented wiring differential protection in a power system. Background technique [0002] For the differential protection of single-bus section connection, the resultant vector of the input line and the resultant vector of the output line should be calculated. When all lines meet the phase angle balance, that is, the difference between phases is 120°, and the phase sequence is the same. At the same time, when the vector sum of each phase of the input line synthesis vector and the output line synthesis vector is zero, that is, the amplitude is equal and the angle difference is 180°, it can be judged that the wiring is correct. [0003] Combining the two methods, the conditions for correct wiring are summarized as follows: [0004] 1) The vector sum of the synthetic vector on...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/06
Inventor 穆明建
Owner 西安爱邦电气有限公司