Pressure Relief Device

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kasrop Associate Join Date: Nov 2016 Posts: 38	Pressure Relief Device 12/17/2019 10:57 AM
	Dear all, What is the difference between pressure relief device and suddenly pressure device in power transformer? Thanks
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: pressure relief device 12/17/2019 11:09 AM
	Pressure relief: Transformer tanks are not built to be considered pressure vessels, so they need to be able to ease the built up pressure with a pressure relief device, or PRD. The pressure relief device is a spring loaded mechanism that vents excessive pressure from your transformer. Sudden presseure: Sudden pressure relays are a specialized protection device to detect transformer or reactor problems. The sudden pressure relay detects sudden changes in transformer oil or gas pressure due to internal faults. The sudden pressure relay has an inverse time characteristic. It operates faster for severe faults.
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Crabtree Guru Join Date: Jul 2007 Location: Commissariat de Police, Nouvions, occupied France, 1942. Posts: 2599 Good Answers: 77	#2 Re: Pressure Relief Device 12/17/2019 11:58 AM
	Nothing much, Mildred. They are both there to stop the thing bursting open. __________________ Good moaning!
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raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#3 Re: Pressure Relief Device 12/18/2019 12:20 AM
	PRD releases pressure by letting the oil to come out through its opening whereas, Sudden pressure relay operates an output relay on sensing sudden pressure buildup in the transformer tank. The output relay contact is wired in trip circuit of the feeder breaker. Sudden pressure relay is used with sealed transformers whereas, Buchholtz relay with conservator transformers. __________________ Raghunath
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StandardsGuy Guru Join Date: Dec 2006 Location: North America, Earth Posts: 4528 Good Answers: 106	#4 Re: Pressure Relief Device 12/18/2019 12:24 PM
	4 power transformer protection devices explained in details __________________ “I would rather have questions that can't be answered than answers that can't be questioned.” - Richard Feynman
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vimal76 Active Contributor Join Date: Jun 2019 Posts: 12	#5 Re: Pressure Relief Device 01/22/2020 11:22 PM
	The pressure relief device (PRD) is device used to release the pressure of the oil filled transformer/reactor tank if the pressure get exceeded above the setting of the PRD. The PRD has the spring loaded mechanism and the valve gets open when the pressure exceeds in the tank. *Read More:Pressure Relief Valve of Transformer*
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Crabtree (1); lyn (1); raghun (1); StandardsGuy (1); vimal76 (1)

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