Zero current disjunction AC vacuum contactor

A vacuum contactor, zero-current technology, applied in the field of electronics, can solve the problem that the safety hidden danger of vacuum contactor cannot be completely eliminated, and achieve the effect of realizing arc-free and non-destructive breaking, reducing spark energy and improving equipment safety performance.

Inactive Publication Date: 2009-09-30
淮南市启迪电子有限公司 +2
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a zero-current breaking AC vacuum contactor to solve the problem that the traditional passive protection technology cannot completely eliminate the safety hazard of the vacuum contactor

Method used

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  • Zero current disjunction AC vacuum contactor

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Embodiment Construction

[0019]The AC vacuum contactor with zero current breaking includes a base, and the base is provided with three vacuum switch tubes, and three pull-in coils corresponding to the three vacuum tubes, and one end of each vacuum switch tube is provided with a The terminal connected to one of the phase lines in the high-voltage three-phase line, and three intelligent control devices corresponding to the three vacuum switch tubes are arranged on the base. The intelligent control devices include a PIC microcontroller model 16F628A and a power The connected voltage transformer, the pin 1 of the PIC microcontroller is connected to the pull-up resistor R146, and then connected to the power supply through a wire, and the pin 2 and pin 3 of the PIC microcontroller are respectively connected to the same series branch through a wire, and the series The branch circuit includes two-way operational amplifiers U14C and U14D of model LM2902. After the output terminals of the two two-way operational...

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Abstract

The present invention relates to a zero current disjunction AC vacuum contactor, composed of three single-phase contactors separately. When using the contactor, a singlechip samples, compares, records power supply voltage and phase, and awaits a stop signal. When the singlechip receives a disjunction instruction, it is capable of controlling three controlled silicon in turn based on an optimum disjunction phase angle, three attracting coils control the disjunction of three-phase contacts when the electric potential passes through zero separately, here the current is zero without sparkle, thus it is capable of implementing non arc disjunction and non breakage to the contactor.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an AC vacuum contactor with zero current breaking. Background technique [0002] Vacuum contactors use advanced vacuum technology, which has outstanding advantages such as strong breaking capacity, large breaking capacity, not easy to oxidize contacts, no arc exposure, suitable for frequent operation, safe and reliable, and small maintenance workload. It has gradually replaced Other types of switches have been widely used. When the vacuum contactor disconnects the inductive load current, the phenomenon that the load current is forcibly disconnected before reaching the zero point often occurs, and the remaining electromagnetic energy on the inductive load will generate overvoltage. cut-off overvoltage. The size of the cut-off overvoltage is proportional to the cut-off value and the inductance of the load. [0003] The reason for the interception of the vacuum tube is mainly due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/66H01H71/24H02H3/00
Inventor 程家龙杨同学胡俊
Owner 淮南市启迪电子有限公司
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