Measuring of generator winding resistance - CR4 Discussion Thread

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Anonymous Poster	Measuring of generator winding resistance 07/09/2007 1:56 AM
	Measuring of generator winding resistance Recently I participated in a generator electrical test program. Measuring of Stator winding resistane is also of the mentioned tests. The recommended test procedure by manufacturer to calculate winding resistance is wattmeter method. In this method, one 50HZ power supply is applied to the three phases of stator winding which is separated from other sections. In this condition electrical current of each phase ( I ) and active power consumption of three phases ( W ) are measured by suitable measuring instruments. Then resistance of each phase ( R ) is calculated as following relation: W = RI² As you know, there are many ways to measure active power in three phase symmetrical circuits.One, two and three-wattmeter methods may be used but in this case, generator manufacturer only recommended "two-wattmeter method" and high accuracy wattmeter for this measurement. How can you explain the reasons of manufacturer choice? Why the two-wattmeter method is the best choice to reduce measurement errors in this case?
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T Man Power-User Join Date: May 2006 Location: Pittsburgh PA Posts: 121	#1 Re: Measuring of generator winding resistance 07/10/2007 9:02 AM
	Effective AC resistance of a particular winding is usually determined by using direct current and volt-amp meter method. This resistance is usually that of two phases since the neutral point of a Wye winding is frequently not accessible. In the less common delta-wound alternator, the windings are permanently spliced together at the Delta points The per phase resistance of one phase in a Wye configuration is Rdc = V/(2A) __________________ “There's a sucker born every minute, and I happen to be one of them”
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kvsubramanyam Guru Join Date: Apr 2007 Location: Hyderabad, India Posts: 596 Good Answers: 12	#2 Re: Measuring of generator winding resistance 07/10/2007 11:55 PM
	It is not Resistance you are testing; it is the "impedence" you get by this method; at 50Hz. By two watt method you get more accurate readings. __________________ Subramanyam
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selvazx Active Contributor Join Date: May 2007 Posts: 10	#3 Re: Measuring of generator winding resistance 07/14/2007 7:52 AM
	Measuring by V-I method is the accurate method. In idle condition, inject about 6-12V battery supply and measure the voltage(V) drop across the winding and the current drawn(I) using accurate, calibrated meters. Resistance =V/I. The winding resistances usually will be very less. So to safe guard the battery from getting drained use about 10 ohm in series. All R&D units and labs follow only this method.
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Users who posted comments:

kvsubramanyam (1); selvazx (1); T Man (1)

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