Method and device for measuring circuit detection of relay protection device

Abstract

The invention discloses a relay protection device measurement loop detecting method and device and belongs to the technical field of power system relay protection. The method includes the following steps that: the multi-source wave recording file of a measurement loop, which is generated when an external fault occurs, is called; a asynchronous multi-source data correlation and time synchronizationare performed on the wave recording waveforms of the multi-source recording file; wave recording waveform data are judged according to a preset rule base, so that the abnormal type of the measurementloop can be determined; an alarm is given out according to the determined abnormal type; and if a new abnormal type appears, a new judgment rule is supplemented to the rule base, so that the rule base can be improved. With the method of the invention adopted, no additional equipment is required, and any additional test does not need to be carried out; by means of communication and expert systems,work can be carried out efficiently and timely without stop, so that the restriction of factors such as personal experience and energy are broken; continuous improvement is carried out in a long-termoperation process, and expansion can be realized; and fusion and analysis of existing multi-source data belong to the deep mining of application functions, and therefore, the intelligence of an operation and maintenance system can be improved.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method and device for detecting a measurement circuit of a relay protection device. Background technique [0002] Hidden dangers such as AC voltage, current or switching value circuits lead to misoperation accidents of protection equipment. In 2011, the polarity of CT on the neutral point side of the 500kV #5 joint transformer of Yunnan Zhenxiong Power Plant was wrongly connected, resulting in misoperation of homodyne protection; in 2013 The polarity of the current transformer used for the generator terminal loss-of-excitation protection of Longkaikou Power Plant was reversed, which caused the measured impedance of the generator terminal to fall into the static state of the loss-of-excitation protection during the non-full-phase operation after the external fault tripped. The steady impedance circle caused the misoperation of the demagnetization p...

AI Technical Summary

Problems solved by technology

The backplane of the main secondary protection of 500kV Longping Line A is in poor contact, but not every time there is no zero-sequence current, but sometimes it does not. It is very likely that there will be omissions by manual analysis, which has a lot of chance and luck

Lines, transformers, busbars and other equipment show different characteristics when faults occur outside the zone, fault phase voltage, fault phase current, non-fault phase voltage, non-fault phase current, zero-sequence current, zero-sequence voltage, differential current, impedance, direction, etc. Features require a very rich and solid theoretical foundation and experience, and it is very difficult to carry out fault analysis

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