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

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...

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