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Switching control method of VVVE permanent-magnet vacuum circuit breaker

A vacuum circuit breaker, permanent magnet vacuum technology, applied in the direction of high-voltage air circuit breakers, circuits, electrical components, etc., can solve the problems of changing closing time, no consideration, and inconvenient actual use

Inactive Publication Date: 2013-09-18
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not consider the influence of temperature changes on the mechanical structure of the circuit breaker, resulting in changes in closing time, and the method of obtaining the reference curve requires continuous replacement of capacitors with different capacities, which brings inconvenience to actual use
Due to the fixed curve selected, it is difficult to adjust the closing time of the circuit breaker

Method used

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  • Switching control method of VVVE permanent-magnet vacuum circuit breaker
  • Switching control method of VVVE permanent-magnet vacuum circuit breaker
  • Switching control method of VVVE permanent-magnet vacuum circuit breaker

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Embodiment Construction

[0026] 1 Equation form of closing coil current

[0027] To vary the coil current, the basic form of the current equation should first be obtained. Since the dynamic characteristic equation of the permanent magnet mechanism is very complicated, it is difficult to realize the change of the current if the dynamic equation is directly used for analysis. In order to quickly obtain the basic form of the coil current and obtain the current curve, the actual circuit breaker coil current is fitted. Taking closing as an example, the coil current waveform of the permanent magnet vacuum circuit breaker is shown as 0.

[0028] In 0, t 1 is the starting time of the moving contact of the vacuum circuit breaker, I 1 is the starting current; t a I is the just closing moment of the moving contact, I a is just closing current; t 2 is the moment when the moving contact completes the overtravel, I 2 is the current of the coil when the overtravel is completed, t 3 is the moment when the clo...

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Abstract

The invention relates to an optimizing method for the switching control of a permanent-magnet vacuum circuit breaker, and the adjustment for the dynamic switching characteristics of the circuit breaker is realized by the method by enabling coil current to follow an optimized current curve. The coarse adjustment and the fine adjustment for the switching time are realized through VVVE, so that the action time of the circuit breaker is constant under different working conditions. The method can be used for compensating the switching time of the circuit breaker on line, so that both the separating time and the switching time of the circuit breaker can be kept stable under different working conditions, so as to provide a reliable basis for realizing synchronous switching.

Description

technical field [0001] The invention relates to the control technology of a permanent magnet mechanism of a vacuum circuit breaker, in particular to a closing control method of a VVVE permanent magnet vacuum circuit breaker. Background technique [0002] At present, the control method of permanent magnet vacuum circuit breakers is generally open-loop control, that is, in the actual opening and closing operation process, the controller does not detect the execution process of the command when it performs the opening and closing command, and does not accept external information. feedback status. In this method, the opening and closing time is easily affected by the instability of the energy storage capacitor and the initial voltage of the capacitor, which causes large fluctuations in the opening and closing time of the circuit breaker. Due to the open loop, it is impossible to control the state of the moving contact of the circuit breaker. In the case of high operating voltag...

Claims

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Application Information

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IPC IPC(8): H01H33/66H01H33/59
Inventor 吕锦柏王毅肖建涛韩薇
Owner BEIJING JIAOTONG UNIV
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