Bypass Isolator

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Anonymous Poster #1	Bypass Isolator 02/08/2018 10:37 PM
	Dear Sirs, In case of double busbar schemes - both busbars are energized. But in case of main and transfer bus scheme - only one busbar is energized normally. Is 'bypass isolator' used only in case of main and transfer bus schemes? Regards,
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Bypass Isolator. 02/08/2018 10:52 PM
	I don't know. Double Bus and Transfer Bus System - Scribd Substation Switching Schemes - Electrical Engineering Portal
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: Bypass Isolator. 02/09/2018 12:09 AM
	..."The bypass isolation switch is designed for applications where maintenance, inspection and testing must be performed while maintaining continuous power to the load. This is typically required in critical life support systems and standby power situations calling for safe system maintenance with no power disruptions."... Bypass isolation switches are just alternative paths to provide uninterrupted power to critical systems during repair or maintenance of existing switchgear...sometimes they are part of a system to switch to an alternative power source such as in the case of emergency backup power when a power outage is sensed the switch is automatically triggered... http://www.eaton.com/Eaton/ProductsServices/Electrical/ProductsandServices/ElectricalDistribution/ANSINEMAPowerDistributionandControlSystems/ATS/BypassIsolationTransferSwitches/ContactorBypassIsolationTransferSwitches/index.htm#tabs-3 https://testguy.net/content/256-6-Common-Substation-Bus-Schemes-Every-Test-Tech-Should-Know __________________ All living things seek to control their own destiny....this is the purpose of life
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raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#3 Re: Bypass Isolator. 02/09/2018 5:50 AM
	'Bypass' refers to bypass of the feeder CB. When this is done, the transfer bus CB acts as the feeder CB, with all the subject feeder protection trips transferred to the transfer bus CB. This is seen in Main and Transfer bus as well as Two main and transfer bus schemes. This arrangement was popular when the outdoor CBs needed more/frequent attention. __________________ Raghunath
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