Can someone tell me how you can provide this 'utility required' protection with a directly connected induction motor. My understanding is that power will flow into or out of the grid in a seemless manner depending only on the speed of the motor/generator shaft and the torque applied. Am I right ??
Perran Newman Perran, You are right. When wiring in the motor/generator typically a magnetic contactor (motor starter) is used to apply power to the unit. The Over/under voltage and over/under freq relays monitor the voltage and frequency of the utility power. If the voltage or freq move outside the utility perscribed limits(and this will only happen if the utility is experiencing a problem) these relays will remove power from the magnetic contactor's coil and the motor/gen will then be isolated from the utility grid thereby providing safety to all.......i hope this helps.......mark [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide! http://us.click.yahoo.com/EA3HyD/3MnJAA/79vVAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
