ncjones
Electrical
- Jan 7, 2004
- 1
Hi everyone,
Here at the utility, we have noticed high voltage at the end of our UG feeders (We regulate to 124 V and in some instances we have recorded voltage levels of >126 V on customer loads at the end of our feeders.). I was recently asked to determine the cause for this rise in voltage.
Here is what I know:
I do know that capacitors are introduced into power systems for power factor correction purposes. The capacitors increase the power factor of the source and also reduce the apparent power. With a decrease in apparent power, the source current also decreases. All of this means lower line losses and lower line-voltage drops which improves efficiency and improves voltage regulation.
Here is what I am unsure of:
Is the rise in voltage on the UG conductors caused by a similar capacitive effect? Can the lower line losses and lower voltage drops produced by a capacitive effect actually raise voltage? If this is so, could someone help me explain why increased negative vars actually raises the voltage. I am having a hard time realizing this concept if it is true. Also, is this effect known as cable charging or is that a whole different matter?
Thanks for everyones help!!
Nate
Here at the utility, we have noticed high voltage at the end of our UG feeders (We regulate to 124 V and in some instances we have recorded voltage levels of >126 V on customer loads at the end of our feeders.). I was recently asked to determine the cause for this rise in voltage.
Here is what I know:
I do know that capacitors are introduced into power systems for power factor correction purposes. The capacitors increase the power factor of the source and also reduce the apparent power. With a decrease in apparent power, the source current also decreases. All of this means lower line losses and lower line-voltage drops which improves efficiency and improves voltage regulation.
Here is what I am unsure of:
Is the rise in voltage on the UG conductors caused by a similar capacitive effect? Can the lower line losses and lower voltage drops produced by a capacitive effect actually raise voltage? If this is so, could someone help me explain why increased negative vars actually raises the voltage. I am having a hard time realizing this concept if it is true. Also, is this effect known as cable charging or is that a whole different matter?
Thanks for everyones help!!
Nate
