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Switchgear Riddle No.4 - Anti Pumping Relay
What is purpose of anti pumping relay?
Author : Roy - From: India
Wed, December 2nd, 2009 - 14:44
Anti-pumping device is a feature incorporated in a Circuit Breaker or reclosing scheme to prevent repeated operation where the closing impulse lasts longer than the sum of the relay and CB operating times. The function of an anti-pumping device is to prevent the circuit breaker closing and opening several times in quick succession. This might be caused by the application of a closing pulse while the circuit breaker is being tripped via the protection relays. Alternatively, it may occur if the circuit breaker is closed on to a fault and the closing pulse is longer than the sum of protection relay and circuit breaker operating times. Circuit breakers with trip free mechanisms do not require this feature.

Author : Hamid - From: Iran
Sun, April 22nd, 2012 - 21:13
Dear sir
I can see K1 relay is connected in series to Closing coil, it means closing coil pick up faster than the K1 realy.
I got a doubt that it it is so for the second puls from TNC the same will repeat i.e till the K1 relay pick up and break the circuit closing puls reaches the Y9.
and further to this I would like to know if S1 aux contact of CB is used in series whti is the use of anti pumping.
hope a early reply
Gov. of Dubai 
Author : Abdul khadar khan - From: India
Fri, April 27th, 2012 - 04:11
The purpose of antipumping relay is to prevent repeated closing and opening operations . Once the closing pulse is given. Antipumping relay prevents the closing again until unless the breaker is opened again. hope u understand the purpose of antipumping relay.

If any doubt regarding circuit operation. Email me 
Author : rukmagoud - From: India
Sun, April 29th, 2012 - 02:04
Excuse me for late reply! I was very busy,sorry

If the close circuit is energized continuously, the anti-pump relay will be latched
in the energized position (after spring charge switch S3 closing). When the anti-pump relay is energized, its normally closed contacts, in series with the closing coil, ensure that the closing coil cannot be energized even if close circuit is completed by CB auxiliary contact S1 after an opening command. The closing coil activates only when the closing circuit is de-energized (de-energizing the anti-pump relay), then closed again. 
Author : Hamid - From: Iran
Thu, November 8th, 2012 - 17:49
Dear Sir

I would like to know about the contact 13,14 in the diagram. is it breaker contact or k1 contacts.
Is it to prevent  continuous closing pulse  or to prevent 2nd or 3rd  etcclosing pulses 
Author : Alex - From: India
Thu, November 8th, 2012 - 21:44
The NO contact 13-14 is a normally open contact of K1 contactor. It considers for latching of K1 contactor in close position. The NC contact 21-22 use to prevent closing pulse iteration and the S1 contact of circuit breaker use to prevent continues energizing of circuit breaker closing coil (Y9). 
Author : Hamid - From: Iran
Tue, July 23rd, 2013 - 19:13
why we can not use breaker NC contact in place of anti pumping contact 
Author : virendra
Thu, July 25th, 2013 - 12:33
With NC contact of circuit breaker instead NC contact of anti pumping relay, iteration closing will be possible when two simultanueous trip and close command is applied to breaker. Please note to location of S1 in a.m. diagram, this contact just considered for closing coil deenrgizing without any affect on anti pumping relay. Indeed the action of anti pumping relay is independent from S1 situations, and this independence is based on anti pumping circuit function.  
Author : Hamid - From: Iran
Sat, August 9th, 2014 - 10:27
Can anyone please describe in detail the schematic that what actually happens - step by step.?? 
Author : saad - From: Pakistani
Sun, November 23rd, 2014 - 16:52
Above i got your detailed information about the Antipumping relay and from this continuous closing to breaker CC will be avoided.Then if in some case continuous opening is given to breaker Tripping coil where it will protect.And why it always used in closing circuit of breaker scheme not Tripping circuit.Can anyone tell me why we are not using?  
Author : Sarathy - From: India
Mon, November 24th, 2014 - 08:42
Circuit breakers usually equipped to trip free mechanism, meaning that they cannot be prevented from tripping by holding or blocking the operating handle in the “ON” position.
Trip Free Operation is a characteristic that is specified in ANSI.
It simply requires that the circuit breaker be able to open without any delay once the auxiliary switch that controls the application of the electric signal to the operating solenoid closes. Under these conditions the contacts of the circuit breaker are permitted to touch momentarily. The second part of the requirement refers to the case when a mechanical trip signal is trying to override the closing operation. In this case the breaker contacts are not allowed to move. IEC does not have any similar specification to these.

Author : Hamid - From: Iran
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