A Fuzzy Diagnosis Method of Switchgear Fault Based on Indirect Temperature Measurement
A diagnostic method and switchgear technology, applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problem of inability to diagnose the fault state of the switchgear and other problems
Active Publication Date: 2019-08-27
ZHUHAI YADO MONITORING TECH CO LTD
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However, for the four independent diagnostic methods, each method has a certain diagnostic ambiguity due to the environment, cabinet structure, load size, and periodic load changes. Fault status to make accurate diagnosis conclusions
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[0085] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:
[0086] The switchgear fault diagnosis method based on the online indirect temperature measurement method of this embodiment includes the following three steps (steps A-C) and a self-learning mechanism (step D).
[0087] Step A: Construct a fuzzy diagnostic matrix; set the set Y={y of the thermal failure state of the switchgear 1 ,y 2 ,...,y n}, set n=4, which means that there are 4 levels of failure levels, y1 means that the equipment is in a healthy state, and the equipment is running normally; y2 means that the equipment has potential failures, but can maintain normal operation; y3 means that the equipment has the possibility of serious failures, An overheating warning is issued; y4 indicates that the equipment has the possibility of emergency failure, and an overheating alarm is issued. Assume that the various diagnostic indicators that cause ther...
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The invention discloses a switch cabinet fault fuzzy diagnosis method based on an indirect temperature testing mode. According to the switch cabinet fault fuzzy diagnosis method, a conventional switch cabinet indirect temperature testing fault diagnosis method is further optimized, various indirect temperature testing fault diagnosis methods are comprehensively used, and thus multiple different fault diagnosis indexes are made. According to resources and states of fuzziness, a fuzzy diagnosis theory and a fuzzy algorithm are adopted, fuzzy subordinating degree functions of various diagnosis indexes are made, and thus a subordinating degree matrix related to fault state grades is established; through fuzzy matrix operation of relevance, a diagnosis conclusion of a fault state grade of high reliability can be made. By adopting the switch cabinet fault fuzzy diagnosis method, the diagnosis conclusion can be relatively accurate, and the conclusion uncertainty caused by fuzziness of any single diagnosis index can be avoided.
Description
technical field [0001] The invention relates to the technical field of fault diagnosis of power switch cabinets, in particular to a method for fuzzy diagnosis of switch cabinet faults based on an indirect temperature measurement method. Background technique [0002] In the power system, the switchgear is responsible for the dual functions of closing and disconnecting the power lines and protecting the safety of the system. With the rapid development of the power system towards high voltage, large units and large capacity, the power grid is expanding day by day and the substation unattended management mode With the popularization and promotion of integrated automation, the safe operation of switchgear is becoming more and more important. When the knife contacts in the switch cabinet and the joints of the incoming and outgoing lines of the power cable are in poor contact, the contact resistance will increase, and heat will be generated when the load current flows. Overheating ...
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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 郭晨华杨志强
Owner ZHUHAI YADO MONITORING TECH CO LTD