GE P742

Commissioning
P74x/EN CM/Na7
MiCOM P741, P742, P743
(CM) 10-25
CM
6.2.1 RB
ph
/ RB
N
is close to 1
P3747ENc
V
A
A
B
C
N
CT
A
CT
B
CT
C
Short-circuit of the secondary
winding of t he current transformer
(HV site)
P992 or MMLG
PU
I
A
I
B
I
C
I
N
Insertion of the test block to open current circuit
=
RB
A
= (RAB + RAN - RBN) / 2
RB
N
= RAN - RB
A
RB
B
= RAB - RB
A
RB
C
= RCN – RB
N