Motor

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ASSER Commentator Join Date: Oct 2013 Posts: 72	Motor 02/27/2019 4:58 PM
	Dear all good day 6.6 kv motor the temperature of s-phase reading 25 c° above another phases please can any one explain what are the possible reasons for this? thanks for all
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: motor 02/27/2019 5:06 PM
	Loose connection... __________________ All living things seek to control their own destiny....this is the purpose of life
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#2 In reply to #1 Re: motor 02/27/2019 6:18 PM
	That or bad winding insulation / turn-to-turn short on the same winding (not going to ground). __________________ All I every really wanted to be, was... A LUMBERJACK!.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#3 Re: motor 02/27/2019 6:28 PM
	Have you checked the volts and amps on each phase? Any imbalances? __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9913 Good Answers: 1141	#4 Re: motor 02/27/2019 7:13 PM
	I suppose it's possible the s-phase sensor is faulty. Do they all read the same when the motor is cold (unenergized)?
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#5 Re: motor 02/27/2019 9:40 PM
	You might have a very unhappy spider in the motor wiring. __________________ "Don't disturb my circles." translation of Archimedes last words
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#8 In reply to #5 Re: motor 02/28/2019 9:59 AM
	“You might have HAD a very unhappy spider in the motor wiring. “ It would be an EX-spider by now... __________________ All I every really wanted to be, was... A LUMBERJACK!.
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#9 In reply to #8 Re: motor 02/28/2019 10:37 AM
	6 kV is three times the nominal bug zapper voltage. You're right, that spider is long gone. I wonder what is the resistivity of an exoskeleton. __________________ "Don't disturb my circles." translation of Archimedes last words
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Stef Guru Join Date: May 2018 Location: Under the spreading Bunya Trees, South Burnett, Queensland, Australia Posts: 809 Good Answers: 65	#6 Re: motor 02/27/2019 11:54 PM
	Hi Asser What do you use to measure the phase temperature of the motor winding? NTC, PTC semiconductor, Thermister, Thermocouple, RTD. any of which can be out of calibration or failing. Have seen RTDs fail slowly in 6.6KV fan motors. If you can measure the windings resistance and inductance when the motor has just been shut down but still hot that may give you some results to work with. You could hire a contractor to carry out a DLA, diaelectric loss angle test on the motr if you suspect a motor problem. Regards Stef. __________________ Hare today, goon tomorrow!
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kasrop Associate Join Date: Nov 2016 Posts: 38	#10 In reply to #6 Re: motor 03/01/2019 4:16 AM
	if the motor not working should be check the sensor but if the motor working should be check the current in each phase if the current not symmetrical check the motor
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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	#7 Re: Motor 02/28/2019 6:11 AM
	<...can any one explain what are the possible reasons for this?...> Yes. Someone local and armed with test equipment can. If that individual is not on the staff, then it may be worthwhile hiring someone. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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nesubra Guru Join Date: Nov 2006 Posts: 729 Good Answers: 2	#11 Re: Motor 03/30/2019 6:35 AM
	what is the sensor?platinum Resistance Temp(RTD).Check the lead wire and Socket .many possibilities are there. __________________ To avoid crticism do nothing,say nothing,be nothing
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JRaef (2); kasrop (1); nesubra (1); PWSlack (1); redfred (2); Rixter (1); SolarEagle (1); Stef (1); Tornado (1)

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