30
Neutral Rogowski Coil Mounting Details
The external neutral Rogowski mounting kit comes complete
with three glass fibre brackets, two fixing screws, two plastic
ties, one 2m length of twisted pair extension lead and one
neutral Rogowski coil.
The mounting bracket has been designed to fit a number of
standard neutral bar arrangements.
Frame 1 M-PACT ACB’s are provided with frame 1 external
neutral Rogowski coils. Likewise fame 2 M-PACT ACB’s are
provided with frame 2 external Rogowski coils. In situations
were the frame 1 Rogowski coil will not fit the required neutral
bar arrangement a frame 2 coil can be provided, but an
additional spill current of up to 4% at In will be introduced. The
error also applies to neutral phase current measurement. This
may result in instability on through fault and earth fault, hence
loss of co-ordination or nuisance tripping.
The neutral Rogowski coil should be fitted in the correct
location with respect to the neutral earth connection (restricted
or unrestricted neutral). For further configuration details
consult application note APP001 available from GE Power
Controls. The coil should be positioned with the arrow facing
the direction as defined below. The end connectors marked
+ve and -ve should be terminated at the A block.
Using a longer extension lead than that provided may result in
EMI effecting the performance of the M-PRO.
Measurement Device Connection
Neutral
Rogowski
Earth Leg
CT
A8 (+)
Not Available
M-PRO 17
A9 (-)
Not Available
A14 (+)
B3 (S1)
M-PRO 30/40
A15 (-)
B4 (S2)
The Rogowski Coil is secured onto mounting
bracket with cable ties (position coil centrally on
clamp).
Incoming supply is connected to the top
terminals.
Arrow on the Rogowski Coil points to the SOURCE.
Unrestricted
Neutral
Position
Restricted
Neutral
Position
Source
Load
Unrestricted
Neutral
Position
Source
Load
Incoming supply is connected to the
bottom terminals.
Arrow on the Rogowski coil points to the LOAD
.
Restricted
Neutral
Position
Earth Leg
CT
Earth Leg
CT
P1
P2
P1
P2
