Asymmetric power transmission line parameter on-line measuring method

A technology of transmission lines and measurement methods, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc.

Inactive Publication Date: 2016-01-06
POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this technical solution is that it only realizes the on-line measurement of the impedance parameters of three...

Method used

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  • Asymmetric power transmission line parameter on-line measuring method
  • Asymmetric power transmission line parameter on-line measuring method
  • Asymmetric power transmission line parameter on-line measuring method

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Embodiment 1

[0047] The method for online measurement of parameters of three-phase asymmetric transmission lines in this embodiment is applicable to transmission lines with a length less than 150 km and a voltage level of 500 kV or below, including the following steps:

[0048] Step 1: Install synchronous measuring devices at both ends of the multi-circuit transmission line under test on the same tower, and at m different times (the line current differences at m different times must be large enough to ensure that the established equations are linearly independent) The voltage and current signals at both ends of the line under test are synchronously measured by the synchronous measuring device, so as to obtain m sets of measurement data at different measurement times, where m≥2.

[0049] The above-mentioned synchronous measuring device can be a measuring device based on the GPS synchronous clock in the prior art to realize synchronous measurement of the current and voltage signals at both en...

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Abstract

The invention provides an asymmetric power transmission line parameter on-line measuring method. The method includes following steps: step 1, synchronous measuring apparatuses are arranged at two ends of a measured line, voltage and current signals at two ends of the measured line are measured in a synchronous manner via the synchronous measuring apparatuses, and m (m>=2) different measurements are performed; step 2, Fourier transform of m groups of voltage and current signals at two ends of the measured line obtained by step 1 is performed, m groups of power frequency voltage phasors and current phasors at two ends of the measured line are calculated, and the phasors comprise voltage and current phasors at head terminals of the measured line from the first group to the mth group and voltage phasors and current phasors of bottom terminals; step 3, self admittances Ya, Yb, and Yc of A, B, and C phases of the measured line and mutual admittances Yab, Ybc, and Yac of each phase are calculated; and step 4, self impedances Za, Zb, and Zc of the A, B, and C phases of the measured line and mutual impedances Zab and Zbc of each phase are calculated. According to the method, parameters of the self impedance and the self admittance of each phase and parameters of the mutual impedances and the mutual admittances between the phases, parameters of positive-sequence and zero-sequence impedances and admittances, and parameters of sequence coupling impedances and admittances between sequences can be calculated.

Description

technical field [0001] The invention relates to an on-line measurement method for asymmetric transmission line parameters. Background technique [0002] The online measurement method of transmission line parameters can reflect the changes of line parameters with the operation mode, conductor temperature and other conditions under actual working conditions, and will not affect the normal operation of the system and the optimal distribution of power flow. It is the future development direction of transmission line parameter measurement. At present, the research on online measurement methods of transmission line parameters mainly has two directions: one is for the measurement of zero-sequence mutual inductance parameters of multi-circuit transmission lines, and proposed methods such as incremental method, integral method and differential method. However, this method can only measure the zero-sequence impedance parameters of the transmission line, and cannot measure the admittan...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 尹建华洪潮杨诚
Owner POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID
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