Same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance

A transmission line and fault distance measurement technology, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of inaccurate representation of lines, influence on distance measurement results, and impact on distance measurement accuracy, etc., and shorten the inspection time of the entire line , The distance measurement principle is simple, and the line model is accurate

Inactive Publication Date: 2018-11-27
JIANGSU ELECTRIC POWER CO
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Problems solved by technology

Different line models will directly affect the ranging results, resulting in errors
When the line model is represented by centralized parameters, the distributed capacitance is often ignored. The resulting line model is relatively simple. Although it is beneficial to fault analysis and calculation, it cannot accurately represent the line, and the distance measurement accuracy is more than 100 kilometers. affected

Method used

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  • Same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance
  • Same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance
  • Same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0048] Double-circuit hybrid transmission lines on the same pole such as figure 1 As shown, including I loop and II loop; both I loop and II loop include l 1 , l 2 Two sections; where l 1 segment and l 2 There are different types of section transmission lines; for example, l 1 The section adopts overhead lines, l 2 Sections use cables, which can usually be buried underground with insulation layers; vice versa;

[0049] The double-circuit hybrid transmission line on the same pole is connected between the M side and the N side of the plant station, l 1 , l 2 The connection point of the two segments is T 1 ;M side power supply E M , N-side power supply E N ; In the equivalent circuit analysis of double-circuit hybrid transmission line faults on the same pole, a unified fault location equation can be derived from the positive sequence, negative sequence, ...

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Abstract

The invention provides a same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance is characterized in that the same pole double-circuit hybrid transmission line is connected between an M side and an N side of a plant station, and a connecting point between two sections I1 and I2 is T1; an M side power is EM, and an N side power is EN; and then fault range finding is performed by means of analysis through a positive sequence equivalence circuit of the same pole double-circuit hybrid transmission line. The same pole double-circuit hybrid transmission line fault range finding method taking regard of influence of distributed capacitance can realize fault range finding of the double-circuit hybrid line by using the basicline parameters and the current data on both sides, and the line model is more complicated, and so that different fault section lines can be identified, and the same pole double-circuit hybrid transmission line fault range finding method is suitable for long-distance lines of more than 100 kilometers.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a method for fault distance measurement of double-circuit hybrid transmission lines on the same pole. Background technique [0002] Fault location technology has always been one of the research hotspots in the field of power engineering. Different line models will directly affect the ranging results and generate errors. When the line model is represented by centralized parameters, the distributed capacitance is often ignored. The resulting line model is relatively simple. Although it is beneficial to fault analysis and calculation, it cannot accurately represent the line, and the distance measurement accuracy is more than 100 kilometers. affected. With the increasing emphasis on economic energy efficiency and environmental beauty, cable overhead hybrid lines have been widely used in various project projects. Therefore, it is necessary to study the fault locatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 邵亮李澄严慧严伟胡晓青
Owner JIANGSU ELECTRIC POWER CO
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