Siemens Siprotec 7UM62 Manual page 505

A (L1)
B (L2)
C (L3)
R
Figure A-27 Busbar System with Low-Ohmic, Switchable Starpoint Resistors
Connection on each side to three current transformers and three voltage transformers (phase-to-ground volt-
ages) –earth fault detection as differential current measuring by two CT sets; detection of displacement volt-
age at broken delta winding (e–n).
7UM62 Manual
C53000-G1176-C149-3
ANSI
52
do not earth
here
low resistance
E
if necessary
(for protection of resistor
e
n
Excitation voltage
injection
Measuring transducer:
- Temperature
injection
- or DC voltage
injection
A.4 Connection Examples
7UM62
I
J1
A(L1)S1
J2
I
J3
B(L2)S1
J4
I
J5
C(L3)S1
J6
R15 V
A(L1)
R17
V
B(L2)
R18
V
R16
C(L3)
R13
V
E
R14
K17 +
TD3
K18
Q7
I
EE2
Q8
Q1
I
A(L1)S2
Q2
Q3
I
B(L2)S2
Q4
Q5
I
C(L3)S2
Q6
K13 +
TD1
K14
K15 +
TD2
K16
J7
I
EE1
J8
489