TRIP

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ahmedican Active Contributor Join Date: Apr 2011 Posts: 10	TRIP 05/06/2011 1:55 PM
	ım working in hydroelectric power plant.We have two cooling water pumps.the power value of each pump is 110 kw. if there was a voltage swing in the system, these pumps are offline.and we must go to trıp and stop generators. my question is that, ı can regulate paramaters in softstarter but is it dangerous or possible? ı think interested parameter is minumum maximum current limit parameter. ı dont want to go to trıp if there is a voltage swing. can you advice me another?
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#1 Re: TRIP 05/06/2011 2:00 PM
	A current limit parameter will have nothing to do with it tripping on under or over voltage, if that's what is happening. __________________ All I every really wanted to be, was... A LUMBERJACK!.
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ahmedican Active Contributor Join Date: Apr 2011 Posts: 10	#2 In reply to #1 Re: TRIP 05/06/2011 2:15 PM
	ı dont understand?
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hien.nguyenquoc Power-User Join Date: Sep 2009 Location: BH, Vietnam Posts: 435 Good Answers: 1	#3 Re: TRIP 05/07/2011 1:23 AM
	Is the generator has any connection with those pumps? Why the pumps are offline then you must go to trip and stop... What do you mean by trip and stop? Why you need to trip and stop? What parameter you want to regulate? Where is minimum and maximum current limit parameter? What is its function? __________________ Anything that can go wrong, will go wrong
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raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#4 Re: TRIP 05/07/2011 3:22 AM
	110kW motor, I guess is connected to 415V bus through non-latched contactors. Control power for these contactors is derived from the same 415V bus. Whenever there is voltage dip in the system these contactors simply drop-off causing loss of cooling water system. Typical AC contactors drop-off at voltages below ~60% whereas DC contactors (including those 'AC contactors with diode bridge' and connected to AC control supply) drop-off below ~45% rated voltage. There are various method available to ensure voltage dip ride through of the non-latched contactors. You can do google search. The requirement of 'voltage dip ride through' should have been part of the design basis report for the project (This is quite common in process industries including power plants). __________________ Raghunath
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