I.L. 40-386.3
2-16
(10/94)
should be set to “Reverse Dir” and Zone3Ø
(Z3P)
, Z3G should be set to 100% of
the line impedance.
f.
Channel Simulation
†
The test function selection provides the capability to simulate the TK switch function
for keying action via OR-18 and AND-35 without the operation of pilot relay units, and
to simulate the RS switch function for receiving of a trip or unblocking frequency sig-
nal action without the operation from the remote transmitter.
g. Programmable Reclosing Initiation
(Figure 2-19)
The basic programmable RI application is as described in Section 3.4.14. However, on
pilot systems, to activate the RI2 on any 3-pole high-speed trip, the external pilot en-
ables switch should be ON, and the
Pilot (PLT)
and
Zone1RI (Z1RI)
should be set to
YES. The operation will occur via the logic AND-89, AND-84 and OR-84A
as shown in
Figure 2-19.
2.5.1.2
Permissive Underreach Transfer Trip
The basic operating concepts of a PUTT scheme are:
(1) Pilot relays
(Pilot Ø and PLTG)
are set to overreach. The pilot channel is a frequen-
cy-shift type device, and the transmitter frequency should be different at each
terminal; its signal may be passed through metallic wire or microwave.
(2) Channel is normally operated with a guard frequency, the channel frequency will
be shifted from guard to trip when the Zone1 reach relay
(Z1Ø/Zone1G)
operates,
and pilot trip is performed when the pilot relay
(Pilot Ø and/or PLTG)
operates, to-
gether with the receiving of a carrier trip signal from the remote end.
PUTT includes the following logic: the functional display
(SystType)
should be set to
PUTT position.
a. Pilot Tripping Logic
The Pilot Tripping Logic for the PUTT scheme is exactly the same as for the POTT
scheme
(Figures 2-20, 2-21).
b. Carrier Keying Logic
(1) Forward fault keying
(Figure 2-23)
For a forward end Zone fault, the PUTT scheme will not key except when the internal fault
is within Zone1. This means that the PUTT scheme keys only on Zone1 faults. Keying flows
via AND-46, OR-18 and AND-35.
(2) Signal continuation
(Figure 2-22)
Same as for POTT scheme.
The TBM logic is not required because the carrier keying units are set underreach.
Summary of Contents for REL 301
Page 1: ......
Page 8: ......
Page 17: ...I L 40 386 3 1 10 10 94 2682F39 Sheet 1 of 2 Sub 2 Figure 1 2 REL 301 302 Layout Vertical...
Page 18: ...I L 40 386 3 10 94 1 11 2682F39 Sheet 2 of 2 Sub 2 Figure 1 3 REL 301 302 Layout Horizontal...
Page 19: ......
Page 20: ......
Page 44: ......
Page 46: ......
Page 48: ......
Page 49: ......
Page 51: ......
Page 53: ......
Page 54: ......
Page 55: ......
Page 56: ......
Page 57: ......
Page 60: ......
Page 62: ...I L 40 386 3 10 94 2 41 Figure 2 32 CO 2 Curve Characteristics 619596 Sub 2...
Page 63: ...I L 40 386 3 2 42 10 94 Figure 2 33 CO 5 Curve Characteristic 619597 Sub 2...
Page 64: ...I L 40 386 3 10 94 2 43 Figure 2 34 CO 6 Curve Characteristic 619598 Sub 2...
Page 65: ...I L 40 386 3 2 44 10 94 Figure 2 35 CO 7 Curve Characteristic 619599 Sub 2...
Page 66: ...I L 40 386 3 10 94 2 45 Figure 2 36 CO 8 Curve Characteristic 619600 Sub 2...
Page 67: ...I L 40 386 3 2 46 10 94 Figure 2 37 CO 9 Curve Characteristic 619601 Sub 2...
Page 68: ...I L 40 386 3 10 94 2 47 Figure 2 38 CO 11 Curve Characteristic 619602 Sub 2...
