Capacitive Loads???

Question

Can someone give me an example of a load on a circut that is a capacitive load (appliance equipment). I know about capacitive reactance where the voltage lags the current and how they can be used to correct power factor in large inductive loads, but what other thatn that is a capacitive load???

Answer 1

Computer equipment, televisions, home entertainment (except most amplifiers) all use off-line switch mode power supplies. The input is transformerless, and consists of a full wave rectifier feeding a large value capacitor(s). This DC voltage is converted to a high frequency pulse which drives a high frequency transformer, stepping down the voltage. This is considered a capacitive load, since the primary element is a capacitor.

Answer 2

I believe power factor corrections are done with capacitor banks. I'm not sure if there is a "capacitive" appliance since most machines are inductive by nature of their motors. Certain types of generators can create VARs (i.e., act like a capacitive load).

You can calculate the size of a capacitor bank you need, and then put it in parallel near your inductive load. This reduces the current and line losses between the power plant and the machinery.

Answer 3

An example is the capacitive impedance drawn by the underground distribution system which is useful to power system engineers since inductive loads demands are too high. It can reduce the size of the required Capacitor Bank.

Answer 4

hi there ;
you want the power factor as near one as possible /
the power measured via VA [ volts x amps ] vs power measured
by a watt meter / we have werk on some large or multiple
single phase and three phase equipment / never seen anyone
go the the trouble of power factor correction /