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D-8
Compact NS630b to 3200
Earth-fault and earth-leakage protection
Neutral protection
Zone selective interlocking
Electrical diagrams
External sensor (CT) for residual earth-fault protection
Connection of current-transformer secondary
circuit for external neutral
Compact equipped with a Micrologic 6 A/E/P:
(1)
shielded cable with 2 twisted pairs
b
T1 twisted with T2
b
maximum length 4 meters
b
cable cross-sectional area 0.4 to 1.5 mm
b
2
recommended cable: Belden 9552 or equivalent.
b
For proper wiring of neutral CT, refer to instruction
Bulletin 48041-082-03 shipped with it.
Do not remove Micrologic factory-installed jumper
between T1 and T2 unless neutral CT is connected.
If supply is via the top, follow the shematics.
If supply is via the bottom, control wiring is identical; for
the power wiring, H1 is connected to the source side,
H2 to the load side.
For four-pole versions, for residual earth-fault
protection, the current transformer for the external
neutral is not necessary.
Connection for signal VN is required only for power
measurements (3 Ø, 4 wires, 4CTs).
(1)
Only for NS630b to 1600.
DB125601
Shield Drain
External transformer for source ground return (SGR) earth-fault protection
Connection of the secondary circuit
Compact equipped with a Micrologic 6 A, E, P
(1)
:
unshielded cable with 1 twisted pair
b
maximum length 150 metres
b
cable cross-sectional area 0.4 to 1.5 mm
b
2
recommended cable: Belden 9409 or equivalent.
b
(1)
Only for NS630b to 1600.
DB128387
Q
Micrologic 6
PE
X1
X2
8
14
11 10
12 5 6 7
13
9
3
1
H1
H2
MiDGF module
M1
M2
T3
F2+
T2
T1/M3
T4/F1
Z1
Z2
Z3
Z4
Z5