Measuring Voltage Transients in Motor application
Measuring Voltage Transients in Motor application
(OP)
Hi all,
It is easy for me to understand transient current surges and how I could measure them in an OPEN TRANSITION WYE start - DELTA run motor application, but all I have is a clamp on ammeter which will not catch or display the transients.
What I do have is a voltmeter which can print a curve to the microsecond. Would someone explain what happens in terms of voltages during the open transition wye to delta switch regarding transients? And also what should I measure voltage across?
As always responses are very much appreciated...
Noel
It is easy for me to understand transient current surges and how I could measure them in an OPEN TRANSITION WYE start - DELTA run motor application, but all I have is a clamp on ammeter which will not catch or display the transients.
What I do have is a voltmeter which can print a curve to the microsecond. Would someone explain what happens in terms of voltages during the open transition wye to delta switch regarding transients? And also what should I measure voltage across?
As always responses are very much appreciated...
Noel





RE: Measuring Voltage Transients in Motor application
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RE: Measuring Voltage Transients in Motor application
Why not monitor the voltage T1-T4, T2-T5,T3-T6.
It should of course increase by square root of 3 during the transition but the peak voltage should not be so high as to damage the winding. How high is ok another question. One might look to surge test standards IEEE522.
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RE: Measuring Voltage Transients in Motor application
Also the rise time of the voltage spike affects how destructive it is (shorter rise time more destructive). I don't know that much about this type measurement but I think you have to be very careful that your measuring setup does not introduce filtering of the high frequency content. Every setup has some upper frequency limit.
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RE: Measuring Voltage Transients in Motor application
measuring equipment is an old hioki 8815 memory hi-corder.
I will be measuring on 208V 50HP systems. i'll keep your advice on turning off filtering in mind. Thanks!
RE: Measuring Voltage Transients in Motor application
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Measuring Voltage Transients in Motor application
=====================================
Eng-tips forums: The best place on the web for engineering discussions.