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Method for starting longitudinal differential protection by using fault component

A technology of longitudinal differential protection and fault components, which is applied in the field of power systems, can solve the problems of insufficient starting sensitivity of longitudinal differential protection on the weak feeder side, and achieve the effect of insufficient starting sensitivity and sensitive starting

Active Publication Date: 2014-02-05
BEIJING SIFANG JIBAO AUTOMATION +1
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AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of insufficient start-up sensitivity of the longitudinal differential protection on the weak feeder side when a high-resistance grounding fault occurs in the line area, this invention proposes a method for starting the longitudinal differential protection on the weak feeder side by using the fault component on the power supply side. The channel transmits the starting signal of the fault component on the power supply side to the protection on the weak feeder side, and combines the action criteria of the zero-sequence differential protection on both sides

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  • Method for starting longitudinal differential protection by using fault component
  • Method for starting longitudinal differential protection by using fault component
  • Method for starting longitudinal differential protection by using fault component

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Embodiment Construction

[0026] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] figure 1 Schematic flow chart of using fault component to realize start-up for longitudinal differential protection.

[0028] The longitudinal differential protection devices on the power supply side and the weak feeder side of the transmission line respectively detect the current and voltage of the transmission line in real time, and calculate the phase current, phase voltage, zero-sequence current vector, zero-sequence voltage vector, negative-sequence current vector and negative-sequence voltage respectively vector etc.

[0029] The phase current, phase voltage and zero-sequence current calculated by the protection can be used to judge the protection start.

[0030] The zero-sequence current vector on the power supply side of the transmission line, the zero-sequence current vector on the weak feeder side, and the protecti...

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Abstract

The invention discloses a method for staring longitudinal differential protection by using a fault component. The method mainly comprises the following steps of: after power side longitudinal differential protection meets three conditions, including a protection starting action criterion, a zero sequence or negative sequence positive direction action criterion and a zero sequence differential protection action criterion, starting a fault component; transmitting a fault component starting signal to weak feedback side longitudinal differential protection through an optical fiber channel; and if protection is not started after the weak feedback side longitudinal differential protection receives a power side fault component starting signal, and meets the zero sequence differential protection action criterion, starting driving protection, so that differential protection on both sides can act. Due to the adoption of the method, the problem of insufficient staring sensitivity of weak feedback side longitudinal differential protection during a high-resistance ground fault is solved.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for starting a weak-feeder-side longitudinal differential protection using a power-supply-side fault component when a high-resistance grounding fault occurs in a high-voltage transmission line. Background technique [0002] When a high-resistance grounding fault occurs in the high-voltage transmission line area of ​​the power system, if the differential protection action setting value is reached, it is required that the differential protection on both sides can select phases quickly and the instantaneous fault can be successfully reclosed. If the differential protection on both sides is not as fast as the backup zero-sequence protection, the backup zero-sequence protection will always trip and not overlap. If the backup zero-sequence protection is not as fast as the transformer protection, it will expand the scope of the accident and may cause a power ou...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/26
Inventor 伍叶凯赵志宏黄少锋范暐张月品于洪雷魏会利熊军
Owner BEIJING SIFANG JIBAO AUTOMATION
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