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jhonson
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Join Date: Nov 2009
Location: PA
Posts: 83
Good Answers: 1

27 Undervoltage Relay Setting Range

08/10/2010 2:09 PM

Does the Relay user always use 27 setting in per unit range like (0.2- 1* Nominal Voltage) or numerical value like 40- 300V, Which of these is more convenient?
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norton850
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Join Date: Jul 2010
Location: South Windsor, CT USA
Posts: 67
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#1

Re: 27 Undervoltage Relay Setting Range

08/10/2010 10:03 PM

You spec. the relay based on a range you are sensing, it usually set for a percentage of your normal operating voltage that your equipment can operate at safely 2 to 5%, maybe more if voltage runs high
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ramvinod
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Join Date: Jun 2007
Location: chennai,India
Posts: 592
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#2

Re: 27 Undervoltage Relay Setting Range

08/10/2010 11:04 PM

This depends on the make and type of relays.

Some relays accept % settings.

Some other relays accept absolute values based on voltage inputs.

Both will be in order.

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