P44x/EN ST/Hb
P442, P444 (ST) 4-
Menu text Default setting
Setting range
Step size
Min Max
GROUP 1: DISTANCE SCHEMES
Aid dist. Delay 0.02s 0 1s 0.002s
Available with PUP Z2, PUP FWD, POP Z1 and POP Z2 schemes. This time-delay
represents the end of transmission time in blocking scheme: if the remote relay has picked
up in zone 2, then it will trip after the “Aid Dist. Delay” on reception of the permissive signal
from the other end of the line.
tReversal Guard 0.02s 0 0.15s 0.002s
Where appropriate, the tReversal Guard and ‘Aid Dist Delay’ (transmission time in blocking
scheme) time-delays (in the case of a blocking scheme covering the transmission time)
settings will appear in the relay menu. Further customising of distance schemes can be
achieved using the Programmable Scheme Logic to condition send and receive logic.
Unblocking Logic None None, Loss of Guard, Loss of Carrier.
Three modes of unblocking logic are available for use with permissive schemes (blocking
schemes are excluded):
– None (basic mode),
– Loss of Guard mode,
– Loss of carrier mode.
See section P44x/EN AP for details.
TOR-SOTF Mode 00000000110000
Where:
Bit 00 = TOR Z1 enabled
TOR Z2 enabled
TOR Z3 enabled
TOR All Zones
Bit 04 = TOR Dist. Scheme
SOTF All Zones
SOTF Lev. Detect.
SOTF Z1 enabled
Bit 08 = SOTF Z2 enabled
SOTF Z3 enabled
SOTF Z1 + Rev
SOTF Z2 + Rev
Bit 0C = SOTF Dist. Scheme
SOTF I>3 enabled
Bit 0E = SOTF Disabled
Sets individual protection zones to enable or disable the TOR
/ SOTF protection. Setting the
relevant bit to 1 will enable that zone, setting bits to 0 will disable distance zones:
– TOR (or SOTF) Zi enabled: TOR or SOTF logic enabled in case of fault in zone i,
– TOR (or SOTF) All Zones: TOR or SOTF logic enabled for all zone,
– TOR (or SOTF) Dist. Scheme: Distance scheme in aided trip logic applied,
– SOTF I>3 enabled: TOR and SOTF initiated after detection by I>3 overcurrents,
– SOTF Lev. Detect.: SOTF initiated by level detectors.
See SOTF / TOR section P44x/EN AP for TOR-SOFT logic and SOFT-TOR trip logic.
SOTF Delay 110s 10.00s 3600s 1s
The Switch On To Fault (SOTF) protection (high speed clearance of any detected fault
immediately following manual closure of the circuit breaker) and Trip On Reclose (TOR)
protection (high speed clearance of any fault detected immediately following autoreclosure
of the circuit breaker).
It is possible to set the time-delay to trip when, for example, the relay has detected a fault
that is still present on a feeder after energising.
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