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Anonymous Poster #1

About DG Set

02/11/2014 10:55 AM

why a dg set give output voltage more than rating output?
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JohnDG
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#1

Re: about dg set

02/11/2014 11:33 AM

1) The regulator's not set correctly, B) it needs a minimum load, and you're running it off-load, or ζ) It's knackered.

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redfred
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#2

Re: about dg set

02/11/2014 11:41 AM

The AP could also be measuring the wrong voltage nodes. They'll never admit it.

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loadshare
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#3

Re: about dg set

02/11/2014 9:51 PM

Between metering and actual voltage measurement should have calibration first

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dhayanandhan
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#4

Re: about dg set

02/12/2014 1:39 AM

Dear friend.

One reason is that the POWER FACTOR will be LEADING POWER FACTOR, where the TERMINAL VOLTAGE will be HIGHER than the Generated voltage.

2nd Reason Error in the Meter.

3rd Reason is related to Excitation related issues.

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vishram lele
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#5

Re: About DG Set

02/16/2014 3:53 AM

In addition to DHAYANANDHAN's comment.

there are following resons why (Summing up all posts) the Voltage of any alternator shoots up..

1. if the Load Power Factor is Leading - Check for any Capacitors in the circuit.

2. The automatic Voltage Regulator not set properly or Faulty..

3. The Sensing Wire used to fed the Feedback to AVR is Open - in this case the AVR will not get any feedback about the actual terminal voltage and seeing it as ZERO, increase excitation power and will result into the Voltage Shooting up than rated.

Now a days all modern AVRs have Sense Loss Protection..

Thanks..
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