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Fault distance measurement method and device suitable for power transmission line containing series reactor

A series reactor and transmission line technology, which is applied to measurement devices, fault locations, instruments, etc., can solve problems such as the failure of the double-ended ranging principle and the uneven distribution of parameters of transmission lines with series reactors installed.

Active Publication Date: 2021-04-23
NARI TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the above-mentioned shortcomings, the present invention provides a fault location method and device suitable for transmission lines containing series reactors, which solves the problem of adding series reactors to transmission lines The uneven distribution of line parameters leads to the failure of the traditional double-ended ranging principle

Method used

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  • Fault distance measurement method and device suitable for power transmission line containing series reactor
  • Fault distance measurement method and device suitable for power transmission line containing series reactor
  • Fault distance measurement method and device suitable for power transmission line containing series reactor

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Embodiment 1

[0044] Generally, the additional series reactor is installed on one side of the line, assuming that the series reactor is located figure 2 On the M side of the middle line.

[0045] Such as image 3 As shown, a fault location method suitable for transmission lines with series reactors includes the following steps:

[0046] Step 1. When a fault occurs on the transmission line containing series reactors, if the line protection devices on both sides determine that it is an out-of-area fault, the line protection devices on both sides will have no ranging results;

[0047] Step 2, when a fault occurs on the transmission line containing series reactors, if the line protection devices on both sides determine that it is an internal fault and the phase is selected correctly, then the line protection devices on both sides will calculate the series reactance compensation voltage U CK ;

[0048] Such as Figure 4 As shown, taking the case of a single-phase fault at point f in the netwo...

Embodiment 2

[0069] A fault distance measuring device suitable for transmission lines containing series reactors, comprising:

[0070] In and out-of-area fault judgment module, when a fault occurs on the transmission line containing series reactors, if the line protection devices on both sides determine that it is an out-of-area fault, the line protection devices on both sides will have no ranging results; After the internal fault is detected and the phase is selected correctly, the series reactance compensation voltage is calculated respectively, and the argument angle of the ratio of the series reactance compensation voltage and the polarization voltage is calculated;

[0071] The fault distance measurement module judges whether the argument angle satisfies the action equation of the series reactance compensation voltage ratio phase ohmic relay. If the distance result is zero, it indicates that it is an internal fault of the series reactor, and the output distance measurement result of t...

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Abstract

The invention relates to a fault distance measurement method and device suitable for a power transmission line containing a series reactor. The method comprises the following steps: calculating a series reactor compensation voltage, judging the internal and external faults of a series reactor region through a series reactor phase comparison type action equation, directly outputting a distance measurement result if a series reactor internal fault occurs, and if a series reactor external line fault occurs, outputting a distance measurement result by adopting a series reactor compensation voltage-based double-end distance measurement method. The problem that the traditional double-end distance measurement principle fails due to non-uniform distribution of line parameters of the added series reactor is solved, the fault distance measurement precision of the power transmission line containing the series reactor is effectively improved, the line fault position is quickly positioned, and the reliability of the power transmission line is improved, and the line patrol workload of operators is reduced.

Description

technical field [0001] The invention relates to a fault location method and device suitable for transmission lines containing series reactors, and belongs to the technical field of electric power system relay protection. Background technique [0002] The existing fault location methods adopted by the line protection device with the longitudinal differential protection as the main protection mainly include single-end distance measurement method and double-terminal distance measurement method. Among them, the single-ended ranging method usually adopts the impedance method, which uses the voltage and current at one end of the line to calculate the impedance. This ranging method has lower requirements for the systems and channels at both ends, but is susceptible to transition resistance and system impedance on both sides. Due to the influence of changes, the distance measurement accuracy cannot be guaranteed, so it is usually not the preferred method for line protection fault lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 姚刚吴通华郑小江孙志攀洪丰陈国洲江源刘天明王威威
Owner NARI TECH CO LTD
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