Wrong start filtering method for transient wave-recording fault indicator

A fault indicator and false start technology, which is applied in the direction of detecting faults, fault locations, and instruments according to conductor types, can solve problems affecting the normal operation of fault indicators and the main station, waste of power consumption of fault indicators, communication congestion of the main station, etc. problem, to achieve the effect of good compatibility, good effect and guaranteed accuracy

Active Publication Date: 2020-01-14
DONGFANG ELECTRONICS
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AI Technical Summary

Problems solved by technology

[0004] However, the acquisition unit has a high sensitivity to start wave recording under various fault conditions, and it is bound to be falsely started due to factors such as environmental changes, electromagnetic interference affecting the electric field, and load fluctuations affecting the current.
If no filter is added, it will cause waste of power consumption of the fault indicator, communication congestion of the master station, seriously affect the normal operation of the fault indicator and the master station, and even miss the real fault recording

Method used

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Embodiment Construction

[0034] The technical scheme of the present invention is described in detail below:

[0035] A false-start filtering method for a transient wave-recording type fault indicator. Firstly, according to the data collected by each phase acquisition unit, it is distinguished whether there is a suspected short-circuit fault or a suspected ground fault, and further judges whether it is a false alarm according to the judgment result. The specific steps are:

[0036] Step 1. The acquisition unit of each phase calculates the following characteristic data respectively, and uploads them to the collection unit:

[0037] 1-1. Calculate the ring-to-ring change rate of the effective value of the current cycle relative to the phase electric field of the previous cycle. The ring-to-ring change rate of the effective value refers to the difference between the effective value of the Nth cycle of the electric field and the effective value of the N-1th cycle Then divided by the rate of change obtaine...

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Abstract

The invention discloses a wrong start filtering method for a transient wave-recording fault indicator. The method comprises the following steps: firstly, distinguishing a suspected short-circuit failure and a suspected grounding failure occurring at present according to data acquired by each phase of acquisition unit; and further judging whether the failure is a false report or not according to the judgement result. In the method, the failure indicator firstly judges whether wrong start is performed or not on an aggregation unit, thereby avoiding further processing of the wrong start and the resulting power consumption waste, and avoiding the communication interference with a main station. The method has important significance for the application, operation and maintenance as well as healthy development of power distribution automation.

Description

technical field [0001] The invention relates to a method for avoiding false start of a fault indicator of a transient state recording type, and belongs to the technical field of power system distribution automation. Background technique [0002] Most of the medium-voltage distribution networks in my country adopt the low-current grounding method, and the probability of single-phase grounding faults in the small-current grounding system is high, accounting for 80% of the total faults. In order to quickly locate and isolate faults, in recent years, detection devices such as feeder terminal unit FTU and transient recorder fault indicator (hereinafter referred to as fault indicator) have been widely installed on distribution lines. [0003] The fault indicator of transient state recording type is composed of a three-phase acquisition unit and a collection unit. The three-phase acquisition unit is used to monitor the field strength and current of the line, judge whether a short ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 刘尚伟吴玲张作峰李志腾张良孙鹏秦旸刘沛沛甘家峰靳力宋新航程培波李磊张成林鲍冬梅王飞刘钧玉凌宇郭庆宝敖云峰
Owner DONGFANG ELECTRONICS
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