ABB T Series - Page 17

17
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Test diagrams for systems with integral
ground fault protection
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Fig. 6 Main circuit breaker with integral ground fault protection - 3-Phase, 4-wire
Test
no.
Connect
Test Current
Supply to
Points
Connect
Jumper
between
points
Results expected Comments
    Circuit breaker
should not trip
This confirms that polarity and ampere
rating of the neutral sensor match those of
the phase sensors in the circuit breaker
   Circuit breaker
should trip at ground
fault setting.
Confirms continuity of round path from
ground bus to neutral
* In 3-wire equipment the load neutral is not furnished. Omit Test 10-1.
Transformer wiring diagram shown as reference only.
This figure is indicated for Internal ground fault protection EKip TU with ABB provided
external ground fault neutral sensor.
NOTE: High Current supply capable of delivering up to .2x ATS amperage, jumper
cables.
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Table 3
N
3-phase, 4- wire
Transformer
N1
A1
Breaker
G1
A2
N2
ATS
Ground
Fault
Test
Current
Supply
To Loads
Ground Bus
N*
NCT