IG-150-EN version 04; 03/10/16
93
General instructions
ekor.rps
Protection functions. Description and settings
Notes
When “Directional Locking” scheme is set or “Inverse
Directional Locking” function is enabled zone 3 must be set
as REVERSE.
Trips, bay pilot wire schemes will reclose depending on the
masks set for external protection
.
main pilot protection schemes
Permissive underreach (PUTT)
Pilot protection signal (ETP) is sent with the activation of
zone 1.
It generates instantaneous pilot protection trip when
receiving the teleprotection signal (RTP) along with the
activation of a unit in zone 1, 2 or 3 (depending on the
settings of trip mask) whenever memorized zone 3 (R)
(Z3(R)MEM) is not activated. The Z3(R)MEM signal can be
eliminated from the logic only by disabling the “Inverse
direction locking” function. In this case the Z3(R)MEM would
be continuously as 0.
The logic diagram of this function is:
Figure 4.25. Permissive underreach
Permissive overreach (POTT)
This scheme uses the teleprotection signal in the
overreach zone 2 (or 1 or 3, depending on the mask) of
the line. Instantaneous trip by teleprotection, when the
teleprotection signal is received along with the activation
of a unit in zone 2, whereas memorized zone 3 (Z3(R)MEM)
is not activated. Z3(R)MEM signal can be eliminated from
the logic disabling “directional unlocking” function. In that
case, Z3(R)MEM would be always at 0.
EPilot protection signal sending with the activation of units
in zone 2, without backwards fault detection Z3(R)MEM.
The logic diagram of this function is:
Figure 4.26. Permissive overreach