Antipumping Relay

well to which type of tripping relay you are refering to : bistable or monostable???

If you are using a bistable ( lockout relay ) then i think you are right as after a trip pulse the lockout relay need to be reset to close the breaker.

But without about for monostable relay?there we need to incorporate the anti-pumping scheme.

Also dont forget anti pumping is also used to protect your closing coil from burning as the closing coil is short term rated.Its not continuous rated.

The concept of an anti-pumping relay is well known for all types of electrically-activated devices, especially circuit breakers.

Its logic systems equivalent is a 'one-shot' device.

The anti-pumping relay allows the breaker to close only once for each press of the 'close' pushbutton (or rotation of the handle).

You see, if a fault exists on the circuit before the breaker is closed, the breaker will close and immediately trip before the operator has a chance to release the close button (or handle). The anti-pumping relay prevents the still-active close signal from trying to reclose the breaker.

Many breakers are not rated for multiple successive reclose operations. If an anti-pumping relay is not used, the rapid close-open-close-open... series can result in destruction of the breaker and harm to the operator.

I have designed antipumping. All discussions I found is useless. The understanding of the Antipumping relays is difficult because meaning of ANTIPUMPING.