Switchgear spring operating mechanism fault diagnostic method

A technology of operating mechanism and switchgear, which is applied in the field of fault diagnosis of spring operating mechanism of switchgear, and can solve problems such as failure types that cannot be detected

Active Publication Date: 2015-11-18
PINGGAO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fault diagnosis method for spring opera...

Method used

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  • Switchgear spring operating mechanism fault diagnostic method
  • Switchgear spring operating mechanism fault diagnostic method
  • Switchgear spring operating mechanism fault diagnostic method

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Embodiment 1

[0025] The common types of mechanical failures of circuit breakers in switchgear include: sneak jumping, refusal to move, etc. From the perspective of the parts where mechanical failures occur, for circuit breakers using spring operating mechanisms, the main parts that cause mechanical failures are: mechanism transmission part, disconnection, etc. There is a fault related to the solenoid of the buckle.

[0026] The switchgear in the circuit breaker generally uses the electromagnet as the first-level control element. When the current passes through the coil, a magnetic flux is generated in the electromagnet, and the iron core is attracted by the electromagnetic force to make the switch open or close. . The current waveform of the coil contains a lot of information, reflecting the working conditions of the electromagnet itself and the latch or valve it controls and the interlock contacts during operation. Therefore, by analyzing and judging the characteristic parameters of the ...

Embodiment 2

[0041] This embodiment diagnoses another kind of fault of the circuit breaker. When performing this fault diagnosis, it is also necessary to obtain the current value Iw at the moment when the contact collision is completed, as follows:

[0042] When the coil is short-circuited between turns, the coil current will increase as a whole when there is no change in the operating voltage due to the decrease in the direct resistance of the coil. However, when the operating voltage increases, the coil current will also increase as a whole. Since the upper limit of the operating voltage is 240VDC and the standard voltage waveform is 220VDC, the range of current change caused by voltage changes is limited. In order to distinguish these two cases, if the actual coil charging time tc' is shorter than the coil charging time tc under normal conditions, the actual core movement time td' is similar to the core movement time td under normal conditions. The ratio is shorter, the actual current v...

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Abstract

The invention relates to a switchgear spring operating mechanism fault diagnostic method, which comprises the steps of: acquiring an induction current of an electromagnet during the motion process of a spring operating mechanism; acquiring coil charging time, iron core motion time and a current feature value at a coil charging completion moment according to the acquired induction current; and comparing the actually obtained parameters with corresponding parameters under normal circumstances for carrying out fault diagnosis of the circuit breaker spring operating mechanism. The switchgear spring operating mechanism fault diagnostic method is simple in process, can diagnose faults by just acquiring the induction current of the electromagnet, and makes judgment based on the coil induction current which is closely associated with the spring operating mechanism, so that the switchgear spring operating mechanism fault diagnostic method can effectively and accurately diagnose circuit breaker faults.

Description

technical field [0001] The invention relates to a fault diagnosis method for a switchgear spring operating mechanism, belonging to the technical field of switchgear fault diagnosis. Background technique [0002] Many studies have been done on the subject of online monitoring and mechanical fault diagnosis of spring operating mechanisms at home and abroad. Some scientific research institutes such as universities and switchgear manufacturers have conducted useful explorations on the monitoring of mechanical characteristics and fault diagnosis of spring operating mechanisms. . At present, most of the exploration and research are limited to the level of theoretical analysis. Only a few have realized the monitoring of the change of the induced current in the electromagnet during the movement of the spring mechanism, but have not developed a more reliable mechanical failure of the spring operating mechanism. Analysis and diagnosis methods, also failed to develop a stable and prac...

Claims

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Application Information

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IPC IPC(8): G01R31/327
Inventor 孙银山张文涛刘宇张一茗袁端磊闫广超李少华宋亚凯高群伟
Owner PINGGAO GRP
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