Capacitor loading on transformers
Capacitor loading on transformers
(OP)
Does anyone know where to find a good reference on capacitor loading of power transformers?
We are interested in the limits and issues with how much capactinance we can put under extreem conditions (stability limits).
We are interested in the limits and issues with how much capactinance we can put under extreem conditions (stability limits).






RE: Capacitor loading on transformers
case to a increased short-circuit current. The limit will be maximum permitted current up to protection acting time.
RE: Capacitor loading on transformers
Most capacitance, whether it be in lines, cables or capacitor banks is shunt capacitance. As such, it will not reduce the reactance and won't result in higher fault currents.
There are series capacitors, but these are used much less than shunt banks.
As far as transformer loading, you can load a transformer up to its MVA rating in Mvar provided you don't have any MW to go with it. There is no stability issue in my opinion.
RE: Capacitor loading on transformers
Supplying capacitive VARs causes quadrature voltage rises.
Back in the days before power factor controllers were readily available or affordable it was common to correct the power factor of a plant by permanently connecting a bank of capacitors. Issues would arise in plants with a poor power factor during operating hours. Quite a lot of capacitance may be added to correct the power factor. Then in the night when the plant was not operating and the main load was lighting, the capacitors would drive the voltage up to the point of burning out lamps.
Bill
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"Why not the best?"
Jimmy Carter
RE: Capacitor loading on transformers
in the Capacitor itself some where let's say in the middle?
RE: Capacitor loading on transformers
I encountered once a problem with a serially coupled battery used to reduce the transformer reactance in order to facilitate a rapid
reactive power injection .The receiver was a flatting mill supplied directly from a high voltage grid.
The huge battery was in resonance with the high voltage /medium voltage transformer connected with a 60 MVAr synchronous condenser.
In this case the short-circuit power of about 5000 MVA was brought down to medium voltage bus rated of 500 MVA only.
RE: Capacitor loading on transformers
Because of this concern, our dispatchers are not using the distribution substation banks. They instead use the transmission banks.
RE: Capacitor loading on transformers