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A method of distance protection entering power system oscillation blocking logic

A technology of distance protection and oscillation blocking, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of low stability of current discrimination method and achieve high stability

Inactive Publication Date: 2015-08-19
XUJI GRP +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for distance protection to enter the power system oscillation blocking logic to solve the problem of low stability of the existing current discrimination method

Method used

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  • A method of distance protection entering power system oscillation blocking logic

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] The traditional blocking method uses the current discrimination method to identify whether the power system is oscillating to determine whether to block the distance protection, that is, to identify the oscillation by relying on the load current being greater than the static stable current setting. After on-site adjustment practice and research, it is found that when the power system oscillates, the magnitude of the through load current on the line is related to the strength of the equivalent power supply on both sides of the line, that is, it is closely related to the system operation mode, and on the other hand, it is related to the network structure of the power system. It is also closely related, so it is more and more difficult to set the fixed value of the static and stable current under the condition of complex network structure and changeable op...

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Abstract

The invention relates to a method for enabling distance protection to enter power system oscillation interlocking logic. The method includes the following steps: 1) judging whether inter-phase current variation components act; 2) removing distance protection interlocking on yes judgment and calculating each inter-phase impedance Z phi phi on no judgment; 3) comparing the phase impedances with a distance protection II section impedance setting value, enabling a distance protection II section to enter the power supply oscillation interlocking logic and comparing the inter-phase impedances with a distance protection I section impedance setting value when the inter-phase impedances are smaller than the II section impedance setting value, and enabling the distance protection I section to enter the power system oscillation interlocking logic when the inter-phase impedances are smaller than the I section impedance setting value. The method has the advantage of being easy to achieve.

Description

technical field [0001] The invention relates to a method for distance protection to enter the oscillation blocking logic of a power system. Background technique [0002] Transmission line distance protection is susceptible to malfunction due to power system oscillation, so it is necessary to quickly implement oscillation blocking logic after the system is fault-free and static stability is destroyed. The currently used method for the distance protection to enter the oscillation blocking logic of the power system is the current discrimination method, that is, under the condition of no fault in the system, if the current of each phase of the protected line is greater than the static stable current setting value, the distance protection performs the oscillation blocking logic, using the current The discriminant method is easy to cause misoperation and refusal of distance protection. Contents of the invention [0003] The purpose of the present invention is to provide a metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 倪传坤李宝伟邓茂军李旭马仪成唐艳梅李文正
Owner XUJI GRP
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