IG-150-EN version 04; 03/10/16
91
General instructions
ekor.rps
Protection functions. Description and settings
4.20. Teleprotection
4.20.1. Operation
It is based upon the use of teleprotection signals between
both end terminals of the line. The effect upon the output
relays’ operation is determined according to the signals
given by the protection along with the signals given by the
other terminals.
In these schemes, the zones 1, 2 and 3 (F, Forward) look
forward and the zone 3R (R, Reverse) looks backwards.
Zone 3 directionality (F) or (R) depends on the setting
“torque control” (enabled or disabled) of the overcurrent
instantaneous function (50), even if the function is enabled
or not. If torque control is set as NO, the direction is forward.
Zone 1 units include the three overcurrent units (timed and
the two instantaneous levels).
There are two basic types of schemes:
1. Locking scheme: The signal received indicates that
the fault falls outside the zone to be protected. An
overreach zone may trip if the lockout signal is not
received after a given waiting period.
2. Permission scheme: The signal received gives
permission for an instantaneous trip within the
overreach zone. Additional ECO and reverse direction
blocking can be used.
The following protection schemes may be selected:
1. Permissive overreach
2. Permissive underreach
3. Directional Locking
4. Directional unlocking
Additionally, together with the schemes, the following can
be selected:
1. ECO
2. Inverse direction locking
4.20.2. Setting range (6 tables)
Setting
Min
Max
Remarks
Remarks
Protection scheme
Permissive overreach
Permissive underreach
Directional Locking
Directional unlocking
Drop off time for input RTP
0
1
0.01
Additional lockout time [s]
0
1
0.01
Guard signal loss time [s]
0
0.15
0.01
Enable ECO
YES/NO
Minimum RTP time for ECO [s]
0
9.99
0.1
Enable inverse direction lockout
YES/NO
Inverse direction lockout time
0
9.99
0.1
Table 4.26.
Setting range
1. Protection scheme: selects the type of scheme.
2. RTP (TRTP) drop time: time during which the
teleprotection reception input (RTP) remains stored.
3. Additional block-out time (TBLQ): waiting time of the
block-out signal.
4. Guard signal loss time (TPSG): waiting time after
receiving the channel loss input.
5. Enabling ECO: enables the ECO function.
6. Minimum RTP time for ECO (TMIN): time during which
the RTP input must be seen so that the ECO signal is
activated.
7. Enabling of reverse direction block-out: it enables the
storage of the reverse direction.
8. Reverse direction locking time (TZ3(R)MEM): reverse
direction storage time.
The respective settings of teleprotection function and zones
in the console are located in “Overcurrent prot. zones 2&3”,
“Distance protection (trip logic)” and “Protection trip mask”.
These settings are not accessible by keyboard/display.
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