Hi Phil,Thomas29...
Please provide detail. For example:
1) Is the Gen'r supplying a local Load-Bus?
2) Is the Gen'r supplying power to the "Grid''?
Regards, Phil Corso
Hi, In manual the tap changer is left in the one position and in auto it will change to to varying output of the generator I believe.Can you please tell a brief about manual position and automatic function difference.
?Thomas29...
Consider:
Thanks I will investigate furtherSorry about the delay
*** Answers below each question thanksThomas29,
The manufacturer’s instructions clearly state the equipment is to be operated by appropriately trained staff.
What is the rated voltage of the generator and the grid with which the generator is synchronized? 440 VAC? 6140 VAC? 11kV? 13.8kV? In other words, how much—in percentage of rated—is 200 VAC?
11kV
Is the tap changer at maximum position—or what position do you propose leaving it in?
should be in position -3 . Was left at 0 in manua
How long do you propose leaving it in the one position?
as above
Why do you feel that leaving it in one position is the best choice?
as above
What is the voltage differential (if any) of the generator when your captive load is not being powered?
Need to check
When the generator is synchronized to the grid, is there a tap changer on the main step-up transformer? If so, what position is it in? (Maximum orMinimum, or somewhere in between?)
Yes oltc on transformer but left in manual by error and at 0 rather than -3
Have you spoken with the grid operators the generator is synchronized to about the voltage differential?
not yet
What is the typical power factor the generator operates at when the voltage differential is present?
Need to check
This is just a portion of the information which would be asked by a knowledgeable tap changer control manufacturer would be asking and need to know. Hard (actionable) data (printouts or electronic data) are best; anecdotal data is not very good nor reliable.
I don’t know if you can provide all the information requested above. If not, the questions are intended to be used in a logical troubleshooting process AND when gathering data for knowledgeable personnel you will most likely need to summon to site.
Since you have posted this on Control.com, we would greatly appreciate hearing the resolution as you work to resolve the issue(s).
Best of luck!
Most—but not all—synchronous generators are not designed to be operated at a large (percentage) voltage differential, which would result in “negative” VArs flowing ‘into’ the generator which can create hotspots in the generator and left unsolved can cause serious damage to the equipment.
“Negative” VArs will also mean a “negative” power factor, a value less than unity (1.0) in the Leading direction.
Kudos... And exactThomas29,
The manufacturer’s instructions clearly state the equipment is to be operated by appropriately trained staff.
What is the rated voltage of the generator and the grid with which the generator is synchronized? 440 VAC? 6140 VAC? 11kV? 13.8kV? In other words, how much—in percentage of rated—is 200 VAC?
Is the tap changer at maximum position—or what position do you propose leaving it in?
How long do you propose leaving it in the one position?
Why do you feel that leaving it in one position is the best choice?
What is the voltage differential (if any) of the generator when your captive load is not being powered?
When the generator is synchronized to the grid, is there a tap changer on the main step-up transformer? If so, what position is it in? (Maximum orMinimum, or somewhere in between?)
Have you spoken with the grid operators the generator is synchronized to about the voltage differential?
What is the typical power factor the generator operates at when the voltage differential is present?
This is just a portion of the information which would be asked by a knowledgeable tap changer control manufacturer would be asking and need to know. Hard (actionable) data (printouts or electronic data) are best; anecdotal data is not very good nor reliable.
I don’t know if you can provide all the information requested above. If not, the questions are intended to be used in a logical troubleshooting process AND when gathering data for knowledgeable personnel you will most likely need to summon to site.
Since you have posted this on Control.com, we would greatly appreciate hearing the resolution as you work to resolve the issue(s).
Best of luck!
Most—but not all—synchronous generators are not designed to be operated at a large (percentage) voltage differential, which would result in “negative” VArs flowing ‘into’ the generator which can create hotspots in the generator and left unsolved can cause serious damage to the equipment.
“Negative” VArs will also mean a “negative” power factor, a value less than unity (1.0) in the Leading direction.
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