Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 57/220
2.11
Distance schemes in the “open” programming mode
When a scheme is required which is not covered in the Standard modes above, the Open
programming mode can be selected. The user then has the facility to decide which distance
relay zone is to be used to key the signalling channel, and what type of aided scheme runs
when the channel is received. The signal send zone options are shown in Table 5, and the
aided scheme options on channel receipt are shown in Table 6.
Setting Signal
Send
Zone
Function
None
No Signal Send
To configure a Basic scheme.
CsZ1
Zone 1
To configure a Permissive scheme.
CsZ2
Zone 2
To configure a Permissive scheme.
CsZ4
Zone 4
To configure a Blocking scheme.
TABLE 5 - SIGNAL SEND ZONES IN OPEN SCHEMES
Setting Aided
Scheme
Function
None
None
To configure a Basic scheme.
PermZ1
To configure a Permissive scheme where Zone 1 can only trip if a
channel is received.
PermZ2
To configure a Permissive scheme where Zone 2 can trip without
waiting for tZ2 timeout if a channel is received.
PermFwd
To configure a Permissive scheme where any forward distance zone
start will cause an aided trip if a channel is received.
BlkZ1
To configure a Blocking scheme where Zone 1 can only trip if a
channel is NOT received.
BlkZ2
To configure a Blocking scheme where Zone 2 can trip without waiting
for tZ2 timeout if a channel is NOT received.
TABLE 6 - AIDED SCHEME OPTIONS ON CHANNEL RECEIPT
Where appropriate, the tREVERSAL GUARD and Tp timer (in case of blocking scheme for
covering the time transmission) 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.
2.12
Switch On To Fault and Trip On Reclose protection
Switch on to fault protection (SOTF) is provided for high speed clearance of any detected
fault immediately following manual closure of the circuit breaker. SOTF protection remains
enabled for 500ms following circuit breaker closure, detected via the CB Man Close input or
CB close with CB control or Internal detection with all pole dead (see Figure 37), or for the
duration of the close pulse on internal detection.
[Instantaneous three pole tripping (and auto-reclose blocking) can be also selected (AR lock
out by BAR Figure 80 in AR section)– See BAR logic in Figure 80 AR description section].
Trip on reclose protection (TOR) is provided for high speed clearance of any detected fault
immediately following autoreclosure of the circuit breaker.
Instantaneous three pole tripping (TOR logic) can be selected for faults detected by various
elements, (See MiCOM S1 settings description above). TOR protection remains enabled for
500ms following circuit breaker closure. The use of a TOR scheme is usually advantageous
for most distance schemes, since a persistent fault at the remote end of the line can be
cleared instantaneously after reclosure of the breaker, rather than after the zone 2 time
delay.
The options for SOTF and TOR are found in the “Distance Schemes” menu.
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