Switch off the all capacitor bank except one whcih u want
to check, if pf value decreasing the same time then its not
good,other capacitor can be check as same procedure.
Don't short cerkit.....
It will be dangerious.........
My non fail proof but handy way is to remove the cap. from
the circuit and connect your VOM to the terminals and watch
the voltage dissipate. The set the VOM to Ohms and
reconnect the meter to the cap. and you should see the
resistance steadily go up close to infinity. You are
actually charging the cap. with the battery in the VOM.
Then recheck the voltage and you should have a low charge
and then it will dissipate again. Good cap. via non fail
First charge the capacitor. After charging use multimeter.
If the multimeter shows any deflection, then the capacitor
is in good condition.
We can also check by connecting the two terminals, but this
is not the proper and safety way.
Disconnect the capacitor from the supply and test the
capacitor terminals with a volt meter, you should have the
same voltage at these terminals as the supply voltage the
capacitor was connected to (you should probably not leave
it too long before you test the capacitor as some
capacitors tend to discharge b y themselves over time).
or you can discharge the capacitor by shorting the
terminals WITH A RESISTIVE LOAD you should never short out
a capacitor with that sort of voltage, it will be
danegerous, by using a resistive load, it will take longer
but it will be safer at least.
once you have discharged the capacitor, most decent
multimeters will have a capacitive test function, just test
the capacitor at the terminals and compare the value with
the value written on the side of the capacitpr and this
will also give you an indication of the its condition..
otherwise, call an electrician...
1. which type of transformer connection is preferred in
case of power supply transformers?
(D) Zig Zag/Star
2. In a power transformer usuall which winding is closer to
(A) Primary winding
(B) Secondary winding
(C) Low Voltage winding
(D) High Voltage winding
3. The power factor of a purely inductive load is