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Acceleration method of zero-sequence inverse time overcurrent protection for adjacent lines of double-circuit lines on the same pole

A technology for overcurrent protection and line protection, which is applied in the field of zero-sequence inverse time-limit overcurrent protection and acceleration protection of the transmission network, can solve the problems of high cost, difficulty in popularization and application, and difficulty in realization, and achieves low cost, clear principle, and realization convenient effect

Active Publication Date: 2019-04-09
SHANDONG UNIV
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Problems solved by technology

The above-mentioned scheme can adjust the action time of protection according to the actual situation, but it needs to use wide-area information, which is difficult to implement and costly, and it is difficult to popularize and apply in the actual field

Method used

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  • Acceleration method of zero-sequence inverse time overcurrent protection for adjacent lines of double-circuit lines on the same pole
  • Acceleration method of zero-sequence inverse time overcurrent protection for adjacent lines of double-circuit lines on the same pole
  • Acceleration method of zero-sequence inverse time overcurrent protection for adjacent lines of double-circuit lines on the same pole

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Embodiment Construction

[0033] The present invention is described in detail below in conjunction with accompanying drawing:

[0034] The invention discloses a zero-sequence inverse time-limit overcurrent protection method oriented to the structure of double-circuit lines on the same pole, that is, an anti-misoperation cooperation method for changing the time setting coefficient, including:

[0035] (1) Obtain the zero-sequence impedance values ​​of the lines on both sides of the double-circuit line on the same pole, respectively, and calculate the critical fault position α corresponding to whether the protection of adjacent lines has malfunctioned according to the obtained zero-sequence impedance values;

[0036] The method of determining the critical fault location α is:

[0037] Record the zero-sequence impedance value of the left system of the double circuit line on the same pole as Z L , the zero-sequence impedance value of the right system is denoted as Z R , the critical fault location α is: ...

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Abstract

The invention discloses an acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines. The method includes calculating a critical failure position of false action of adjacent line protection according to an obtained zero sequence impedance value; calculating zero sequence inverse time limit protection zero sequence current flowing through the two ends of a failure line when a failure occurs at the critical failure position and calculating the action time of failure line two end protection; calculating the action time of protection of adjacent lines on two sides of the two-circuit lines by adding a time delay to the action time of failure line two end protection; solving a time setting coefficient of protection of adjacent lines on two sides of the two-circuit lines after a setting process. The invention also discloses a zero sequence current change based acceleration scheme for zero sequence inverse time limit overcurrent protection of the adjacent lines. The invention has beneficial effects that prior performance of inverse time limit protection is not affected; and normal action of zero sequence inverse time limit protection is enabled when a prior acceleration scheme cannot work due to different reasons, so that failure elimination reliability is ensured.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a method for preventing maloperation and an acceleration protection method for zero-sequence inverse time-limit overcurrent protection of a transmission network oriented to a double-circuit line structure on the same pole. Background technique [0002] Zero-sequence inverse time overcurrent protection has the unique advantage of inverse time limit, that is, the current flowing through the protection installation is inversely proportional to the protection action time, so it can obtain higher sensitivity when used as backup protection, and its application in high-voltage power grids is also increasing. widely. When a ground fault occurs in the power system, the zero-sequence equivalent power supply is located at the fault point. The farther the distance from the fault point is, the smaller the zero-sequence current flows. Therefore, in general, the zero-se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/093H02H3/32
CPCH02H3/093H02H3/32H02H7/26
Inventor 丛伟张子衿康奇豹肖静王安宁尹丰钊盛亚如孙梦晨张丽强胡亮亮
Owner SHANDONG UNIV
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