ABB RELION REX640 - Residual voltage transfer

1 Stand-by feeder voltage
2 Busbar voltage
3 Voltage difference between stand-by and busbar voltage
4 Main feeder current
5 Stand-by feeder current
6 Transfer duration
Figure 945: Vector diagram of a transfer at the 1
st
phase coincidence
U
Stand-by
Stand-by feeder voltage
U
Busbar
Busbar voltage
φ Angle between stand-by voltage and busbar voltage
dφ/dt Angle speed between stand-by voltage and busbar voltage
Blue area Connection window (dependent upon breaker closing time and dφ/dt
If DISA_RUN input is active, transfer is not allowed to complete until input is
deactivated.
When 1
st
phase transfer is completed, this is indicated with COMPL_1ST_PH output.
Control functions
1MRS759142 F
1778 REX640
Technical Manual