Online detection method for vacuum circuit breaker contact on-off time based on vibration analysis

A vacuum circuit breaker and vibration analysis technology, applied in the electrical field, can solve the problem of online measurement of the closing time of three-phase contacts without vacuum circuit breaker, and achieve the effect of improving the event time resolution ability and anti-interference ability.

Inactive Publication Date: 2005-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the reference literature at home and abroad, there is no relevant report on the online measurement of the three-phase contact closing time of the vacuum circuit breaker.

Method used

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  • Online detection method for vacuum circuit breaker contact on-off time based on vibration analysis
  • Online detection method for vacuum circuit breaker contact on-off time based on vibration analysis
  • Online detection method for vacuum circuit breaker contact on-off time based on vibration analysis

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Experimental program
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Embodiment

[0055] In the laboratory, three acceleration sensors of the type M353B18 are used to detect the closing vibration signal of the ZN12 vacuum circuit breaker. Before this, the transposition signal of the three-phase contact is measured offline to verify the effect of vibration detection. see Figure 6 The closing transposition signal and closing vibration signal waveform of the three-phase contact of the ZN12 vacuum circuit breaker shown, the abscissa in the figure is the time axis, X a 、X b 、X c They are the vibration signals corresponding to the closing of the three-phase contacts of A, B, and C, respectively, and C a 、C b 、C c They are the transposition signals of the A phase, B phase and C phase contacts during the closing process. It can be seen that phase C is the first conjunct phase, followed by phase A and phase B in turn. The time difference dt between the two phases of B and C represents the closing synchronism of the vacuum circuit breaker.

[0056] right F...

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Abstract

This invention discloses a vacuum breaker probes on or off moment on-line measurement method based on vibration analysis, which comprises the following steps: first to select the fix position and direction of the vibration sensor; second to set sample order, sample frequency, sample length and trigger means and to store the sample data; third to pre-process the vibration data; fourth to select moving window function type and length and adopt short-time energy calculation for further analysis; fifth to select threshold value to determine the on or off moments of triphase probes; sixth to calculate the closing term and closing time according to the on or off moments. This invention improves the affair resolution ability and anti-interference ability in the vibration signal analysis.

Description

technical field [0001] The invention relates to the field of electrotechnical technology, in particular to an online detection method for the closing moment of contacts of a vacuum circuit breaker based on vibration analysis. Background technique [0002] The closing moment of the three-phase contacts of a vacuum circuit breaker is an important parameter to describe its mechanical operation state. The calculation of many mechanical characteristic parameters such as closing time, closing speed and closing synchronism all depend on the determination of the contact closing moment. It is relatively easy to detect this point off-line, and it is generally realized by adding an auxiliary electrical circuit to the three-phase fracture. detect accurately. However, when the circuit breaker is working under load, the three-phase contacts are at high potential, so it cannot be detected by traditional offline electrical methods. In the previous on-line monitoring of circuit breakers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 孟永鹏贾申利荣命哲
Owner XI AN JIAOTONG UNIV
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