Vacuum circuit breaker, vacuum contactor to cut off the high voltage motor and the transformer is easy to cut off the over-voltage, repeated over-voltage and three-phase over-voltage off at the same time. Used to protect the operation of the over-voltage protection devices are commonly used zinc oxide surge arresters and RC absorber.
Resistive-capacity absorber and zinc oxide arrester has the following differences:
1, the arrester to limit the main, only cure; and RC absorber to absorb energy using the capacitor so that the over-voltage does not exceed the allowable value, and the use of resistance damping effect, the rapid decay of oscillation to prevent the main specimens Both.
2, no gap zinc oxide arrester for the neutral point of non-grounding system, the damage rate; gap zinc oxide arrester discharge voltage, , But also to ensure that the level of insulation with the motor match. For more information, contact Jinzhou Ruihuang Capacitor Technology Co., Ltd.
3, the operating voltage of the oscillation frequency up to 105 ~ 106Hz, great harm to the motor and transformer, while the circuit breaker prone to re-burn. In this regard, the surge arrester can not change the oscillation frequency, while the RC absorber because the capacitor increases, will greatly reduce the oscillation frequency, reducing the motor winding potential gradient, and reduce the circuit breaker re-burning probability.
4, due to the valve response speed relationship, the shorter the over-voltage wave head, zinc oxide arrester residual pressure is higher, the impact of the steep slope of the residual pressure under the impact of operating current than the residual pressure to 20 ~ 35%, which makes And the motor with the voltage between the extremely difficult to match. Shut-off over-voltage and resurgence of over-voltage similar to the steep slope, the first time less than 1 micro-wave, will zinc oxide arrester protection performance deterioration. The RC absorber can also delay the wave head time and reduce the steepness.
5, zinc oxide arrester for single-phase connection, can not protect the white-phase over-voltage. Vacuum circuit breaker caused by the operation of over-voltage, phase to phase over-voltage than the relative over-voltage higher than 1/3 to 1 / 2. The Rui-type LG resistance capacitance over-voltage absorber can be selected according to user requirements, And other parameters, can protect the phase and the relative over-voltage.
