Vacuum-degree on-line monitoring system of vacuum circuit breaker
A technology of vacuum circuit breaker and monitoring system, which is applied to high-voltage air circuit breakers, circuits, electrical components, etc., can solve the problem of inability to distinguish whether the vacuum interrupter is leaking or not, so as to reduce the sampling frequency of digital-to-analog conversion and reduce the processing of data amount, avoid the effect of signal features
Inactive Publication Date: 2016-05-11
STATE GRID CORP OF CHINA +1
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[0005] In order to overcome the deficiencies of the prior art above, the present invention provides a vacuum degree online monitoring system for vacuum circuit breakers. By vector summing the signals of the three probes, digital filtering is performed by a single-chip microcomputer, and high-frequency harmonics are removed. It can clearly find the leakage of one phase or two phases in the three-phase vacuum interrupter, and overcome the inability to distinguish the vacuum interrupter when the vacuum interrupter is completely leaked and the air pressure reaches the atmospheric pressure only by monitoring partial discharge or monitoring the potential change of the shielding cover Disadvantages of whether the chamber is leaky
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[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0028] The invention provides a vacuum degree online monitoring system of a vacuum circuit breaker, (such as figure 1 ) includes a three-phase vacuum interrupter (1), three electric field probes, an induction circuit (2) inside the electric field probe, a control circuit (3) and a central processing module (4); the three electric field probes are located in the three-phase vacuum interrupter The interior of the arc chamber (1) is connected to the control circuit (3) respectively, and the control circuit (3) is connected to the central processing module (4) through the RS485 bus.
[0029] Such as figure 2 , the induction circuit (2) includes a signal acquisition unit (21), a signal conditioning unit (22) and a signal conversion unit (23), and the signal acquisition unit (21) collects the shielding in the vacuum interrupter (1) The AC power frequency potenti...
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The invention provides a vacuum-degree on-line monitoring system of a vacuum circuit breaker. The system comprises a three-phase vacuum arc extinguishing chamber (1), three electric field probes, an induction circuit (2) located in the electric field probes, a control circuit (3) and a central processing module (4). The three electric field probes are located in the three-phase vacuum arc extinguishing chamber (1) and are connected to the control circuit (3) respectively. The control circuit (3) is connected to the central processing module (4) through an RS485 bus. In the invention, vector summation is performed on signals of the three probes; a single chip microcomputer is used to carry out digital filtering to remove a high frequency harmonic wave so that one phase or two phase leakage in the three-phase vacuum arc extinguishing chamber can be clearly discovered; and a disadvantage that whether the vacuum arc extinguishing chamber is leaked can not be distinguished when the vacuum arc extinguishing chamber is completely leaked and air pressure reaches atmospheric pressure only through a mode of monitoring partial discharge or monitoring potential changes of a shielding case is overcome.
Description
technical field [0001] The invention belongs to the technical field of distribution network automation, and in particular relates to an online monitoring system for vacuum degree of a vacuum circuit breaker. Background technique [0002] According to statistics, in 10kV and 35kV power distribution systems, the occupancy rate of vacuum circuit breakers is increasing year by year. At the same time, vacuum circuit breakers are developing in the direction of large capacity and high current, and have made great progress. When a circuit breaker fails, the direct harm is damage to the lines and equipment protected by it, and power loss; the indirect harm is causing power grid accidents or expanding accidents, large-scale power outages for users, affecting normal life, production and even social stability. , causing great economic loss and social impact. [0003] In my country's electric power industry, the current maintenance of electrical equipment such as circuit breakers basica...
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Inventor 盛万兴宋祺鹏梁英王金丽王金宇寇凌峰方恒福杨红磊王利段祥骏冯德志李运硕
Owner STATE GRID CORP OF CHINA