Fsk Mode Special Considerations - Ametek UPLC-II System Manual

UPlC-ii™ System manual
(+)
TB6–1
Channel 1 DTT
Loss of Channel 1
TB6–2
TB4–1
Loss of Channel 2
*
Channel 2 DTT
TB4–6
* Output is normally energized,
LOR
therefore contact would be open
(–)
Figure 3–19.
Dual Channel Direct Transfer Trip with
Throwover
to Single Channel
(+)
TB6–1
TB6–3
Channel 1 DTT
Channel 1 DTT
TB6–2
TB6–4
TB4–1
TB6–3
Loss of Channel 2
*
Channel 2 DTT
TB4–6
TB6–4
* Output is normally energized,
LOR
(–)
Figure 3–20.
Dual Channel Direct Transfer Trip with
Throwover
to Single Channel
Page 3–28
TB4–1
*
TB4–6
TB6–1
TB6–2
TB4–1
*
Loss of Channel 1
TB4–6
TB6–1
Channel 2 DTT
TB6–2
therefore contact would be open
3.7 FSK Mode Special
Considerations
The UPLC-II™ frequency-shift equipment can
operate in either the two- or three-frequency mode.
The three basic frequencies are as follows (see
Figure 3–21):
f C Center frequency
f H High-frequency, is a frequency shift (Δf)
above f C
f L Low-frequency, is a frequency shift (Δf)
below f C
The value of Δf depends on the bandwidth of the
UPLC-II™ set. For a bandwidth of 1200 Hz, Δf is
500 Hz. A bandwidth of 300 Hz yields a Δf of
100 Hz, while the 600 Hz bandwidth Δf can be
either 250 or 100 Hz. The center channel frequency
(f C ) can vary from 30 to 535 kHz (in .01 kHz
steps).
In the two-frequency systems, only f H and f L are
used. The two frequencies function differently and
take on different labels when operating with the dif-
ferent types of protective relay systems.
DTT Trip
(Trip 1)
D
f (f – f)
L C
Figure 3–21. UPLC-II™ 3-Frequency System
Unblock Trip
(Trip 2)
D
f f (f + f)
(Guard)
C H C