GE Industrial Solutions EntelliGuard R AKD-5 - Manual (Page 43)

42 EntelliGuard R Circuit Breaker Retrofill AKD-5 Installation Manual DEH-41547 02/12
• Sensor window cross section conforms to criteria as found in the table below (
Table 9):
Table 9. Frame Ratings and Sensor Areas
Frame & Rating Sensor Window minimum area (in 2 )
Frame 1 / 2000A 2.0
Frame 2 / 3200A 3.2
Frame 3 / 6400A 6.4
The Frame 3 neutral sensor is implemented as two separate sensors, similarly to the phase sensors
in the circuit breaker. Frame 3 neutral bus assemblies provide two independent parallel conductors
in the neutral bus such that the neutral current is divided between the two sensors.
A special neutral bus section is provided within the switchgear to accommodate the specific form
factor of each Rogowski—this is not the design responsibility of the Rogowski vendor.
• Encapsulation materials are UL recognized and suitable for operation at 130C.
• Neutral sensors of a given rating match all characteristics of the phase sensors.
AKD-5—Multi-Source Ground Fault
Retrofills can be used in the following ground fault applications:
• Single source feeder breakers, 3-wire or 4-wire
• Main circuit breakers, 3-wire or 4-wire
When multi-sources are present with the ground fault detection on the trip unit desired, then an
external GF summing CT scheme must be implemented. This applies to Main—Tie—Main systems or
systems with a main source and then a back-fed generator source.