Protector for preventing interception over-voltage and arc reignition over-voltage of vacuum circuit breaker

A technology for intercepting overvoltage and vacuum circuit breakers, which is applied in high-voltage air circuit breakers, switches and circuits operated by overvoltages, etc., can solve the problem of high residual voltage, achieve low residual voltage, large current capacity, and prevent interception and overvoltage. and the effect of arc re-ignition overvoltage

Active Publication Date: 2010-03-03
CHANGZHOU MECAN ELECTRIC TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are usually two main solutions: one is to improve the structure of the contact; the other is to connect resistors at both ends of the contact or to install an overvoltage protection device between lines or lines to ground on the external circuit. There are certain technical problems such as high residual voltage and other methods such as connected surge arrester valve plate or resistance-capacity overvoltage absorber.

Method used

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  • Protector for preventing interception over-voltage and arc reignition over-voltage of vacuum circuit breaker

Examples

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Embodiment Construction

[0012] Such as figure 1 As shown, a protector that prevents vacuum circuit breakers from generating cut-off overvoltage and arc restrike overvoltage includes a ZnO non-linear resistor column valve R with a C value of 100-120V / mm N1 , SiC non-linear resistor ring valve R with a C value of 40-50V / mm N2 and a ZnO non-linear resistor column valve R with a C value of 60-80V / mm N3 , the protector valve body assembled in series and parallel with each other, and the output end is connected in parallel to the two ends of the DL dynamic and static main contact.

[0013] The protector for preventing the vacuum circuit breaker from generating cut-off overvoltage and arc restrike overvoltage is composed of ZnO non-linear resistance column valve plate R N1 with SiC varistor ring valve R N2 Series, ZnO non-linear resistor column valve R N3 It is then connected in parallel at both ends of RN2, and then the protector is connected to both ends of the main contact of the circuit breaker.

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Abstract

The invention relates to a conversion current and over-voltage protection technology of electric equipment, in particular to a protector for preventing interception over-voltage and arc reignition over-voltage of a vacuum circuit breaker. A valve body of the protector is assembled by mutual series-parallel connection of a column-type valve plate RN1 of a ZnO non-linear resistor, a ring-type valveplate RN2of a Sic non-linear resistor, and a column-type valve plate RN3 of a ZnO non-linear resistor ; then output ends are connected to both ends of DL movable and stationary main contacts in parallel. The vacuum circuit breaker has the ability of converting current and limiting voltage when the large current is switched on and off, and the function of preventing the interception over-voltage and the arc reignition over-voltage when the low current is switched on and off. When the circuit breaker closes the switch, the current flows from both ends of the main contacts and does not flow in the protector, thus the protector can not have the aging problem, a loop can not cause the reignition over-voltage in the process of switching on and off, thereby protecting the main contact against burning or shortening the service life due to the arc reignition.

Description

technical field [0001] The invention relates to the commutation and overvoltage protection technology of electrical equipment, in particular to an overvoltage protector for preventing vacuum circuit breakers from intercepting overvoltage and arc re-ignition. Background technique [0002] The operation overvoltage of the vacuum circuit breaker is due to the existence of inductance and capacitance energy storage elements in the circuit, and the electromagnetic oscillation is caused by the energy generation and transfer in the circuit at the moment of switching operation. The operating overvoltage of vacuum circuit breakers is divided into three types: cut-off overvoltage, multiple restrike overvoltage and three-phase simultaneous breaking overvoltage. There are usually two main solutions: one is to improve the structure of the contact; the other is to connect resistors at both ends of the contact or to install an overvoltage protection device between lines or lines to ground o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/66H01H83/10
Inventor 朱仲彦唐明
Owner CHANGZHOU MECAN ELECTRIC TECH DEV
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