Toshiba GR-200 Series Instruction Manual page 300

Voltage check for autoreclose (VCHK)
To start the autoreclose function (ARC), a synchronism check may be required between the
incoming voltage and the running voltage. Hence, a voltage-check-for-autoreclose (VCHK)
function is provided within the (ARC) to fulfil this requirement. The (VCHK) function checks
the absence/presence of the incoming/running voltages and the difference in their respective
voltages, phase angle and frequencies. After successful checking, a permissive signal (ARC-
VCHK) is output to the ARC function. Subsequently, the ARC function will issue an 'ARC
CLOSE COMMAND' for the closing of the CB†.
Busbar G
CB
Line VT
Bus VT
VCHK
(G)
Permissive
ARC (G)
Reclosing
Figure 2.25-1 Three ARC relays applied to a distribution line with VCHK operations
†Note: If the ARC function does not require the permissive signal generated by the
VCHK function, set the scheme switch [ARC-NOVCHK] to On. In this case, the
permissive signal (ARC-VCHK) is output to the ARC function unconditionally.
Busbar H
CB
Line VT
Bus VT
VCHK
(H)
Permissive
ARC (H)
Reclosing
- 281 -
6F2T0200 (0.15)
Busbar S
CB
Main feeder (line)
Line VT
Bus VT
VCHK
(S)
Permissive
ARC (S)
Reclosing
GRE200 (1,2)
Bus VT
VCH
AR