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A relay protection system which can distinguish short-circuit and harmonic and its working method

A technology of relay protection and working method, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc. To reduce the probability of accidents such as production shutdown, enhance stability, and overcome control lag

Inactive Publication Date: 2008-12-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, almost all relay protection devices, especially measuring relays, set the threshold value based on the analysis of the difference between the two different operating states of each electrical quantity in normal operation and fault operation of the system, without considering Operational characteristics of abnormal operating states
However, with the development of power electronics technology, especially the application of thyristor technology, the system generates a large number of harmonics during operation, which poses a serious hazard to the power system, especially for relay protection and other automation devices. Normal operation has a large impact
As far as the relay protection itself is concerned, its ability to distinguish between fault conditions and abnormal operating conditions caused by harmonics is poor

Method used

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  • A relay protection system which can distinguish short-circuit and harmonic and its working method
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  • A relay protection system which can distinguish short-circuit and harmonic and its working method

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Embodiment

[0040] Embodiment: a kind of relay protection system that can distinguish short circuit and harmonic (see figure 1 ), comprising a computer, characterized in that it comprises a digital signal processing unit, data acquisition and data conversion module, switch value input / output module, power supply module, alarm module and man-machine exchange module; said data acquisition and data conversion module The input end is connected to the external voltage transformer and current transformer, and its output end is connected to the input end of the digital signal processing unit; the input end of the said digital input / output module is respectively connected to the output end of the digital signal processing unit and the protection unit, and its output end is connected to the input end of the digital signal processing unit; The output end is connected to the input end of the protection unit; the output end of the power module is connected to the input end of the digital signal proces...

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Abstract

This invention relates to one relay protection system to divide short cut and resonance, which comprises digital signal process unit, data collection and conversion module, switch input and output module, power module, alarm module and human to machine exchange module. The invention comprises the following steps: data collecting, testing and comparing, switch signal outputting and relay protecting. The invention method has the following advantages: a, relay protection reliability and speed; b, electricity stability; d, effective division of short cut fault and resonance wave; d, double signal control on operation.

Description

(1) Technical field: [0001] The invention belongs to the technical field of electric power system relay protection, in particular to a relay protection system capable of distinguishing short circuit and harmonic and its working method. (two) background technology: [0002] The main task of power system relay protection is to selectively cut off the fault line in the shortest possible time when the power system fails. A general relay protection device is composed of three parts: a measurement comparison element, a logic judgment element and an execution output element. At present, in order to adapt to the rapid development of the electric power industry, so that the power grid can continuously, safely and reliably provide users with high-quality electric energy, digital relay protection control technology is more and more used in actual operations, thereby improving the relay protection. All aspects of performance of the protective device. At present, almost all relay prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02H7/22H02H3/32
Inventor 周雪松徐晓宁马幼捷侯明弓晋霞张智勇刘富永
Owner TIANJIN UNIVERSITY OF TECHNOLOGY