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henry98
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Join Date: Mar 2019
Posts: 29

Regulator Balance Meter

11/12/2020 8:31 AM

Dear all

in exciter EX2100 from GE we have three meter (gen. field voltage,gen. field current and Regulator balance) what is the purpose of Regulator balance meter and what is the effect if it is reading positive or negative and what we will should be do to make it in zero position.

thanks
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PWSlack
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#1

Re: Regulator balance meter

11/12/2020 9:08 AM

CR4 does not provide access to telephone usage training.

It would be interesting to know why the <...we...> can't look this up in the information that was supplied with it, and why the <...we...> can't contact <...GE...> and obtain this information "from the horse's mouth", as it were.

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Rixter
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#2

Re: Regulator balance meter

11/12/2020 9:14 AM

If you have two generators (or 1 generator and a bus) in parallel and the regulator voltages are not adjusted equally, there will be reactive current flowing between the generators. This reactive current is not contributing to any power output and is only heating up the generator coils, wasting energy. Adjust the voltage (excitation) on the generator until the meter reads zero.

  • "When generator sets operate in parallel the alternator field excitation system of each generator set controls the proportional sharing of the total reactive power requirements (kVAR) of the system.
  • The kVAR load sharing is achieved by increasing or decreasing the field excitation to the systems’ alternators.
  • As the field excitation of one generator set in a group is increased i.e. overexcited it will not lead to an increase in voltage (as it would if it were operating alone) but it will lead to an increase in the proportion of the total kVAR load it will deliver and a decrease in its power factor.
  • As the field excitation of one generator set in a group is decreased i.e. under-excited it will not lead to a decrease in voltage (as it would if it were operating alone) but it will lead to a decrease in the proportion of the total kVAR it will deliver an increase in its power factor."

https://dieselship.com/marine-technical-articles/marine-electro-technology/active-reactive-power-sharing-in-a-paralleled-generator-set-kw-kvar/#:~:text=When%20generator%20sets%20operate%20in%20parallel%20the%20alternator%20field%20excitation,excitation%20to%20the%20systems'%20alternators.
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rwilliams
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#4
In reply to #2

Re: Regulator balance meter

11/13/2020 2:07 PM

If Regulator Balance is really reactive power or generator power factor, generating at unity power factor or less is the least stable operating point for the generator, providing little margin for pullout, and reducing the possible contribution to power system stability that the generator could provide. It’s generally better to operate the generator so it is exporting reactive power.

I wonder if the balance is between two regulator components, static (PPT) and SCT sources for excitation. You could bias the SCT excitation to balance out the sources to improve stability.

In any event, best to find out what it really indicates before setting targets or adjusting controls....

The GE EX 2100 user manual is useless for this, BTW
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StandardsGuy
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#3

Re: Regulator Balance Meter

11/13/2020 12:29 AM

Surely there is an operation manual for the unit. Lacking that you can call the company and talk to a technician or engineer for assistance.

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rwilliams
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#5

Re: Regulator Balance Meter

11/13/2020 3:10 PM

It’s likely you have redundant excitation supplies, and the meter shows how the operating supply compares with the backup supply. There should be a trim pot somewhere to adjust the tracking. Normally you might have automatic tracking, so the null meter should read close to zero throughout your operating range, providing everything is working ok.
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Power Prof
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#6

Re: Regulator Balance Meter

11/13/2020 6:37 PM

I believe that you have two regulators, the "Automatic" (AVR) adjusts the excitation current to follow the system voltage and produces the VAR load the system needs. The "Manual" (MVR) controls the excitation, directly, and is mostly used in bringing the unit on line or doing some on-line maintenance. To go from AVR to MVR one would get the balance to zero, first.
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