HT Motor

4 comments

Rate

lalit_nawada Commentator Join Date: Apr 2009 Location: CG Posts: 64	HT Motor 03/15/2010 11:48 AM
	we have a h.t motor of rating 2000kw,supply voltage 6.6kv. when we started motor tripped on earth fault,then we checked the ir value of motor and found 2MOHM phase to earth and 5 MOHM phase to phase. so i want to know is this value o.k?????????
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: H.T motor 03/15/2010 11:49 AM
	What is the earth fault device set to? What were the same set of readings on the cable feeding it downstream of the earth fault device with the motor disconnected? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Register to Reply

lalit_nawada Commentator Join Date: Apr 2009 Location: CG Posts: 64	#2 Re: H.T motor 03/15/2010 11:55 AM
	we set earth fault on long inverse(as per IEC STANDARD) Iep-.10 tep-.05 CT RATIO-200/5 MOTOR FLC-203 AMPS.
	Register to Reply

lalit_nawada Commentator Join Date: Apr 2009 Location: CG Posts: 64	#3 Re: H.T motor 03/15/2010 12:01 PM
	CABLE I.R VALUE IS OK.
	Register to Reply

rudy.leurs Power-User Join Date: May 2007 Location: Flanders (Belgium) Posts: 343 Good Answers: 21	#4 Re: HT Motor 03/16/2010 7:00 AM
	At what voltage did you measure the resistance ? 500V, 1kV, 2.5 kV ?? Cold motor ? warm motor ? In each case, the 2 of 5 Mega ohm looks not good to me. We repair electrical motors, and a newly repaired (low voltage 400-690V AC) motor has a resistance of more than 4000 Mega ohm, measured on a cold (+/- 20°C) motor at a test voltage of 1000 VDC. The minimum I would advise should be at least 100 Meg ohm (testvoltage 1kV) Keep in mind that when it is foggy outside or the surrounding is humid, the readings will be lower.
	Register to Reply

Copy to Clipboard

You might be interested in: Motor Test Equipment, Motor Repair Services, DC Motor Drives

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (71 right now) Show Members