Under/Over voltage settings for 480 VAC gen-set

[tyboy]

What should the recomended settings be for over and under bus volatage relays on a genrator set operating at 480 VAC?

 

[dpc]

It depends on the application. If it is running in island mode, not connected to utility grid or other generators, and not service life-safety equipment, I'd suggest 110% and 90% with a suitable time delay or inverse time curve.

 

[boomsystems]

Irrespective of grid or isolated operation, set your relays to 115% and 85% inverse characteristics for O/V and U/V respectively. Check with your type of connected load for time setting.

 

[jbartos]

Suggestion: The emergency generators are usually not designed with over/under voltage protection since their intent is to function in spite of various load side adversities, to supply power to emergency loads.

 

[tyboy]

This is an emergency lighting system that supplies emergency power for egress lighting loads on an offshore floating facility.I presently have it set at 110 % and 90% respectively.I was pretty sure I was close but wanted to get some feedback from other idustries.I do occassionally sync to my normal power which is three 4160 4750 KW genset's but only for 5 seconds.Anyway thanks for the feedback guys.

 

[zqew05]

TYBOY, ya goin' to the Christmas party in Lafayette this coming weekend? Most attendees will check in at Hotel Acadiana