Method and device of pilot protection incomplete phase fault opening of double circuits on same tower

A double-circuit line and longitudinal protection technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve the problem that the directional components cannot be opened, etc.

Active Publication Date: 2016-12-21
XUJI GRP +4
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for non-full-phase grounding fault opening for longitudinal protection of double-circuit lines on the same pole, that is, a method for comparing voltage amplitudes to solve the problem that the directional element cannot be opened due to the problem of voltage sensitivity problems, to ensure the correctness of the non-full-phase longitudinal protection action

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  • Method and device of pilot protection incomplete phase fault opening of double circuits on same tower
  • Method and device of pilot protection incomplete phase fault opening of double circuits on same tower
  • Method and device of pilot protection incomplete phase fault opening of double circuits on same tower

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Embodiment of non-full-phase grounding fault opening method for longitudinal protection of double-circuit lines on the same pole

[0026] A non-full-phase fault opening method for longitudinal protection of double-circuit lines on the same pole according to the present invention mainly adopts the method of voltage amplitude comparison, and combines the judging conditions of whether the phase selection partition of the current side or the opposite side is the current phase, and When the impedance quadrilateral of the corresponding phase operates, the correct action of the non-full phase distance of the longitudinal protection is realized.

[0027] The following is an example of non-full-phase opening of phase A, such as figure 1 and 2 shown. Among them, the non-full-phase opening logic of B and C phases is the same as that of A phase. Its opening pr...

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Abstract

The invention relates to a method and device of the pilot protection incomplete phase fault opening of double circuits on a same tower. For an incomplete phase ground phase, an existing direction component can not act when the voltage is too low to cause a protection misoperation. The invention provides a voltage equation criterion to substitute a present direction component, according to the criterion, positive and negative direction fault protection measurement current and impedance product voltage amplitude characteristic differences are mainly used to propose a criterion |Theta*Zl|>k*Un, and after using a voltage equation criterion, the correctness of incomplete phase fault pilot protection action can be ensured. The technical scheme of the invention has the advantages of clear directivity, no influence by measurement voltage amplitude, and higher sensitivity compared with a traditional direction element.

Description

technical field [0001] The invention relates to a method and device for non-full-phase ground fault opening for longitudinal protection of double-circuit lines on the same pole, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] The double-circuit line on the same pole refers to two lines that run in parallel at a relatively short distance in part or in the whole process. The outgoing line corridor is narrow, the transmission capacity is large, the investment is small, the effect is quick, and the operation and maintenance are simple. [0003] There are many types of cross-line faults on double-circuit lines on the same pole. After a multi-phase cross-line fault occurs, the line jumps one phase and enters a non-full phase. If the fault still exists, the longitudinal protection is required to quickly remove the fault. When the longitudinal protection is not full-phase, the action logic is generally that the distance...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/267
Inventor 李旭倪传坤樊占峰李宝伟唐艳梅李文正邓茂军陈继瑞郝慧贞孟利平汪花永颜志刚石光韩伟马卫东
Owner XUJI GRP
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