Breaker closing resistor tripping mechanism and breaker using same

Abstract

The invention relates to the field of breakers, in particular to a breaker closing resistor tripping mechanism and a breaker using the same. The breaker closing resistor tripping mechanism comprises a mechanism box, a transmission component is rotationally assembled in the mechanism box through a rotating shaft, two hinge points are arranged on the transmission component, and the hinge axes of the two hinge points are both parallel to the rotating shaft. The rotating shaft is further provided with a crank arm and a plate stirring switch, the crank arm is in rotating fit with the rotating shaft, a switch shaft is rotationally assembled between the two ends of the crank arm, the switch shaft is parallel to the rotating shaft, a radial notch used for avoiding the plate stirring switch is arranged on the outer circumferential face of the switch shaft, the end, away from the rotating shaft, of the crank arm is further connected with a resistor connecting rod in a hinged mode, the resistor connecting rod is used for driving a closing resistor to be connected and disconnected, and a linkage connecting piece is arranged between the resistor connecting rod and the switch shaft. When the breaker is closed in place, the notch in the switch shaft exactly faces the plate stirring switch, thus, it can be ensued that the crank arm drives the closing resistor to be reset when the breaker is closed in place, and the closing resistor is automatically cut off after the closing of contacts of an arc extinguish chamber of the breaker.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a circuit breaker closing resistance tripping mechanism and a circuit breaker using the mechanism. Background technique [0002] In the ultra-high voltage power grid, the circuit breaker closes the no-load long line, especially when the power supply voltage amplitude and the residual voltage of the line are in reverse phase. Due to the sudden change of line parameters, the oscillation of electromagnetic energy on the power grid will cause a large overvoltage. In order to limit this closing overvoltage, the closing resistor is often used to absorb part of the electric energy in the grid and convert it into heat energy, so as to weaken the electromagnetic oscillation and limit the overvoltage. [0003] Limited by the thermal capacity of the resistive element, the current-through duration of the resistive element must be very short. Therefore, when the circuit breaker is actually ru...

AI Technical Summary

Problems solved by technology

The second is to keep it in the closing position after being short-circuited by the main breakout. When performing the opening operation, ensure that the resistance breakout is opened before the main breakout, and the breaking current is transferred to the main contact. The resistance contacts act at the same time during the opening operation, and the operating power is relatively large during the opening operation

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