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A Hybrid Line Distance Protection Method Based on Lossless Line Equation

A hybrid line and distance protection technology, applied in emergency protection circuit devices, detection of faults by conductor type, instruments, etc., can solve the problem of not considering the change of UHV line parameters, and achieve a simple and practical setting method, accurate protection range, easy to use effect achieved

Active Publication Date: 2019-12-31
哈尔滨光宇电气自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this distance protection principle does not consider the distributed capacitance of the UHV line and the parameter changes of the cable / GIL section, it will cause serious consequences if it is directly used in a mixed line

Method used

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  • A Hybrid Line Distance Protection Method Based on Lossless Line Equation
  • A Hybrid Line Distance Protection Method Based on Lossless Line Equation
  • A Hybrid Line Distance Protection Method Based on Lossless Line Equation

Examples

Experimental program
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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Step A: According to the non-destructive line transmission equation of the transmission line, deduce the calculation formula of the measurement reactance of the non-destructive line part during the phase-to-phase fault and the ground fault.

[0038] When the transmission line fails, ignore the resistance of the line between the protection installation and the fault point, and consider that there are only inductance and capacitance in the line, then the line between the protection installation and the fault point can be equivalent to a lossless line, the schematic diagram Such as figure 1 shown. in, Respectively, the voltage and current at the protection installation place; Respectively, the voltage at the fault point and the current flowing from m to fault point f at the protection installation. According to the line parameters, wr...

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Abstract

The invention relates to a mixed line distance protection method on the basis of lossless line equations. The mixed line distance protection method includes steps of acquiring measured reactance expressions of lossless line portions on the basis of frequency-domain parameters of power transmission lines according to transmission equations of the lossless line portions of the power transmission lines when different types of faults of lines occur; plotting phasor diagrams of voltages and currents at protection mounting locations according to pure reactance characteristics shown by the lossless line portions of the power transmission lines, solving port voltages of the lossless line portions according to geometric relations between phasors of the currents and the voltages at the protection mounting locations and then computing measured reactance of the lossless line portions of the power transmission lines; determining the protection ranges of mixed line distance protection according to actual distance protection range requirements.

Description

technical field [0001] The invention relates to a hybrid line distance protection method based on lossless line equation. Background technique [0002] Common hybrid lines include cable-overhead hybrid lines and GIL-overhead hybrid lines. The electrical parameters of cables / GIL are different from those of overhead lines, and the accuracy of distance protection is related to line parameters. Therefore, uneven parameters along hybrid lines may cause The distance protection action area changes, which may cause distance protection misoperation in severe cases. Therefore, it is of great practical significance to study the distance protection suitable for mixed lines to ensure the safe operation of lines. [0003] The distance protection of traditional overhead lines equates the line with concentrated resistance and inductance, and the line impedance is proportional to the line length. According to the measured impedance, the location of the fault is judged, so as to realize the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085G01R31/088H02H7/26
Inventor 李博通谷天峰李斌陈晓龙陈冲
Owner 哈尔滨光宇电气自动化有限公司