J
Jackson JC
Hi, I can't seem to get my head around how to test a 3 Phase Motor circuit to obtain the value of Zs.
1. After isolation of circuit and locking off u short out the 3 Phases on the motor terminal block with shorting straps.
2. At the Dist Board with a Low Ohm meter you test the resistance between each phase:-
L1/L2, L1/L3, L2/L3, then obtain the average of the 3 then divide by 2 because the cable is half that resistance. The value obtained is R1
3.To get R2 u go between L1,L2 or L3 and CPC.
4. Then you add the Ze at the origin of the installation and add it to Ze+(R1+R2) = Zs
Is this correct?
1. After isolation of circuit and locking off u short out the 3 Phases on the motor terminal block with shorting straps.
2. At the Dist Board with a Low Ohm meter you test the resistance between each phase:-
L1/L2, L1/L3, L2/L3, then obtain the average of the 3 then divide by 2 because the cable is half that resistance. The value obtained is R1
3.To get R2 u go between L1,L2 or L3 and CPC.
4. Then you add the Ze at the origin of the installation and add it to Ze+(R1+R2) = Zs
Is this correct?