Parallel multi-loop power transmission line zero sequence parameter positive sequence on-line testing method

A technology for transmission lines and zero sequence parameters, which is used in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc. It can solve the problems of inability to obtain phase domain parameters, large amount of measurement by incremental method, and complex equation establishment and solution. question

Inactive Publication Date: 2016-12-07
全玉生 +3
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  • Abstract
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Problems solved by technology

The existing perturbation method is simple to operate but the test accuracy is not high; the existing incremental method has a large amount of measurement, complicated operation, and a large amount of calculation, which needs to solve n(n+1)/2 complex number equations. Very complicated
[0004] The existing multi-loop synchronous zero-sequence test method can only obtain the overall average equivalent zero-

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  • Parallel multi-loop power transmission line zero sequence parameter positive sequence on-line testing method
  • Parallel multi-loop power transmission line zero sequence parameter positive sequence on-line testing method
  • Parallel multi-loop power transmission line zero sequence parameter positive sequence on-line testing method

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Embodiment Construction

[0146] In order to verify the validity and reliability of the method of the present invention, a parallel double-circuit line and a four-circuit line of different voltage levels (220kV, 110kV) are taken as examples for verification.

[0147] The spatial layout of the double circuit line is attached Figure 7 As shown, the label 0 indicates the lightning protection line, the labels 1, 2, and 3 respectively indicate the three phases A, B, and C of the first loop, and the labels 4, 5, and 6 respectively indicate the three phases A, B, and C of the second loop. , the double circuit line voltage level is 220kV. The double circuit simulation model is attached Figure 8 shown.

[0148] The impedance parameter analysis of the present invention uses EMTP-ATP to establish a parallel double-circuit transmission line model, takes three different soil resistivities for simulation verification, and uses the Line-check function that comes with the software to read the different loops of th...

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Abstract

A parallel multi-loop power transmission line zero sequence parameter positive sequence on-line testing method is disclosed and belongs to the field of parallel multi-loop line coupling parameter testing. According to the method, steady-state data is used for testing positive sequence impedance and admittance of a loop line being tested, a ratio of impedance of parallel multi-loop lines and a ratio of admittance of the parallel multi-loop lines are calculated in the same environment, own impedance (own admittance) Z<->ii and mutual impedance (mutual admittance) Z<->ij are estimated and are finally presented in a formula defined in the description, errors can be effectively suppressed, and zero sequence coupled impedance and admittance of the parallel multi-loop power transmission lines can be tested indirectly on line. Via use of the testing method put forward in the invention, special-purpose zero sequence operation is not required, normal system operation cannot be affected, specifically effects exerted on an impedance testing method by soil resistivity is taken into account, fault tolerance capability and anti-interference capability of the method can be guaranteed, a parallel multi-loop power transmission line parameter testing method can be simplified, and testing efficiency, flexibility and operability can be improved.

Description

technical field [0001] The invention belongs to the field of zero-sequence coupling parameter testing of parallel multi-circuit transmission lines. The present invention proposes an online test method for zero-sequence coupling parameters of parallel multi-circuit transmission lines. The method only needs the voltage and current at both ends of a group of parallel multi-circuit transmission lines during normal operation to measure the positive-sequence impedance of the test loop. Calculate the ratio of each impedance and each admittance of parallel multi-circuit lines under the same environment, establish the relationship between each corresponding physical quantity, and realize the indirect online test of zero-sequence coupling impedance and admittance of parallel multi-circuit transmission lines. The present invention proposes to express the relationship between self impedance and mutual impedance (self admittance and mutual admittance) by the ratio of physical quantities be...

Claims

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Application Information

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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 全玉生房林杰王紫鉴师普辛
Owner 全玉生
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