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Portable line parameter measurement method

A line parameter and measurement method technology, which is applied in the field of electric power system, can solve the problems of outage of the tested line, too many measuring equipment of different frequency test method, complicated wiring, etc., achieve simple and convenient wiring, realize live measurement, and improve measurement efficiency Effect

Inactive Publication Date: 2014-04-02
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

The test method of high-voltage electrical equipment uses too many meters, the wiring is complicated, and the anti-interference performance is poor. It is necessary to completely cut off the power of the tested line
There are many problems in the different frequency test method, such as too many measuring devices, difficulty in extracting frequency conversion signals, and the need to stop the line under test.

Method used

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Embodiment Construction

[0044] The present invention will be described below in combination with specific embodiments and with reference to the accompanying drawings.

[0045] A transmission line parameter measurement method used in a power system uses a portable line parameter measurement device to realize the measurement of positive sequence parameters and zero sequence parameters of the transmission line.

[0046] This embodiment has the following steps:

[0047] 1) Use the external timing signal to realize the timing of the portable line parameter measuring device, and use the internal timing module to realize high-precision timing;

[0048] 2) Transport the portable line parameter measuring device to the measurement site, and complete the secondary wiring of the power system. Among them, the AC current wiring uses clamps;

[0049] 3) The portable line parameter measuring device samples and records the voltage and current of the line synchronously;

[0050] 4) Collect data from portable line pa...

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Abstract

A portable line parameter measurement method for a power system comprises the following steps: (1) a portable line parameter measurement device completing timing function, and realizing punctuality through an internal module thereof; (2) conveying the portable line parameter measurement device to a site, and completing secondary connection; (3) the portable line parameter measurement device synchronously sampling and recording voltage and current of a line; (4) a line parameter measurement center collecting data collected by the portable line parameter measurement devices on two ends, and realizing line parameter calculation by using positive-sequence parameter or zero-sequence parameter calculation method. The method provided by the invention can realize power transmission line parameter measurement of a power grid by using two devices by fully utilizing the characteristics of the portable line parameter measurement device, such as simple connection and moving convenience, and can save the measurement equipment and realize hot-line parameter measurement.

Description

[0001] technical field [0002] The invention relates to the field of power systems, in particular to the measurement of line parameters of the power system. Background technique [0003] Transmission line parameters are extremely important parameters in power system setting and calculation. "DL / T 584-2007 3kV~110kV Grid Relay Protection Device Operation Setting Regulations" stipulates that the impedance of 66kV and above overhead lines and cable lines should use measured values. "DL / T 559-2007 220kV~750kV Grid Relay Protection Device Operation Setting Regulations" stipulates that the positive-sequence and zero-sequence impedance, positive-sequence and zero-sequence capacitance of overhead lines and cable lines should use measured values. [0004] The existing transmission line parameter measurement methods mainly adopt the traditional high-voltage electrical equipment test method and different frequency test method. The test method of high-voltage electrical equipment uses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/08
Inventor 吴克谦郭开禄许洋
Owner STATE GRID CORP OF CHINA
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