GE AKR-30 Series Maintenance Manual page 251

FIG. 1 01 - RMS-9 PHASE SENSORS
FIG. 1 02 - 'H'-OPTION PHASE SENSOR
FIG. 1 03 - TYPICAL N EUTRAL SENSOR
Fig. 1 03 shows the neutral sensor. The neutral sensor
is req uired when i ntegral grou nd 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 circ uit wh ich sums these
values. The total val ue will remain zero as long as there is
no ground current flowi ng. See cable d iagram in Fig. 1 07.
The neutral sensor is an electrical duplicate of the phase
sensor. Therefore, when phase sensors are charged the
neutral sensor m ust be correspondingly changed.
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