Non-whole-course double-circuit parallel power transmission line non-synchronous data fault distance detection method

A technology for fault distance measurement and transmission lines, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement. It can solve the problems of large amount of calculation and less research on fault location methods, and achieve small amount of calculation and simple principle of discrimination. Practical and reduce the effect of hardware delay

Inactive Publication Date: 2018-03-20
TIANJIN UNIV
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Problems solved by technology

[0004] At present, the principle of fault location for single-circuit lines and double-circuit lines is relatively mature, and there are few researches on fault location methods for non-full-length parallel

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  • Non-whole-course double-circuit parallel power transmission line non-synchronous data fault distance detection method
  • Non-whole-course double-circuit parallel power transmission line non-synchronous data fault distance detection method
  • Non-whole-course double-circuit parallel power transmission line non-synchronous data fault distance detection method

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[0038] In the following, the content of the present invention will be further calculated and expressed in detail based on the drawings of the specification.

[0039] Such as figure 1 It is a schematic diagram of a non-full-length parallel double-circuit transmission line on the same pole. The I and II circuits on the M side are erected on the same pole with a common bus. After the T node, the two circuits are respectively erected to the N-side substation and the P-side substation by the impedance Z. The impedance value of the electrical connection between the N-side substation and the P-side substation is related to the topology and operation mode of the grid connected outside the line. The distance between the two circuits of the MT branch is relatively close and there is a coupling effect, which is a coupled line section; the NT branch and the PT branch are single circuit lines, which are non-coupled line sections. For the coupled line section, the decoupling is performed in th...

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Abstract

The invention relates to a non-whole-course double-circuit parallel power transmission line non-synchronous data fault distance detection principle. The non-whole-course double-circuit parallel powertransmission line non-synchronous data fault distance detection principle is characterized in that utilizing an electric transformer at a protection mounting position to acquire the electrical data ofeach end of a system, respectively decoupling a double-circuit coupling line section and a single-circuit line section, calculating the positive sequence voltage of each end, and the whole power andthe fault component of the current of the line; according to the magnitude, of the positive sequence voltage fault component of the connection point, calculated at two ends of the same line, determining the fault branch circuit; and on the fault branch circuit, according to the double end non-synchronous fault distance detection principle to position the fault so as to eliminate invalid false rootand determine the fault position.

Description

technical field [0001] The invention relates to the technical field of relay protection of electric power systems, in particular to a non-synchronous data fault ranging method for double-circuit power transmission lines on the same pole in parallel. Background technique [0002] Double-circuit lines paralleled on the same pole have the advantages of large transmission capacity, low engineering cost, narrow outlet corridor, small footprint and short construction period, etc., and are widely used in the planning, construction and actual operation of power systems. Due to the different power transmission requirements, many double-circuit lines paralleled on the same pole often adopt the transmission method of not erecting the whole process on the same pole. [0003] Compared with the parallel transmission line with the same pole throughout the whole process, there is a big difference in both line structure and fault type. Since only part of the two lines are erected on the sam...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 李永丽张斯淇陈晓龙
Owner TIANJIN UNIV
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