FIG. 1 01 - RMS-9 PHASE SENSORS
FIG. 1 02 - 'H'-OPTION PHASE SENSOR
FIG. 1 03 - TYPICAL NEUTRAL SENSOR
Fig. 1 03 shows the neutral sensor. The neutral sensor
is required when i ntegral ground fault protection is used
on single phase-three wire or three phase-four wire sys
tems. It is inserted into the neutral conductor and therefore
is separately mounted in the cable or bus compartment.
The outputs of the phase sensors and neutral sensor
are connected to a programmer circuit which sums these
values. The total val ue will remain zero as long as there is
no ground current flowing. See cable diagram in Fig. 1 07.
The neutral sensor is an electrical duplicate of the phase
sensor. Therefore, when phase sensors are charged the
neutral sensor must be correspondingly changed.
73
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