Mode 4 (Only One Command Active); Mode 5A (3 Independent Commands) - Siemens SWT 3000 Equipment Manual

2.7.3.7

Mode 4 (Only One Command Active)

Table 2-11
Activated Input
All off
BI1
BI2
BI3
BI4
BI1 + BI2 or
BI1 + BI3 or
BI2 + BI3 or
BI1 + BI2 + BI3
BI4 + BIx
-
USYNC
1) If an invalid frequency or code is received, or in case of guard tone alarm: If t
unblocking impulse (t
RXALR output (ALR1-3 resp. ALR2-3 contact if activated in the ALR configuration).
2) Input error. If more than one input is activated f
3) If an invalid frequency or code is received, or in case of guard tone alarm.
Explanation
The PU4 checks the state of input signals BI1 to BI4 from the protection device for plausibility. Only 1 of the
signal inputs BI1 to BI3 can be active. If more than 1 of the signal inputs BI1 to BI3 is active and BI4 is inactive,
an input error occurs (prohibited input combination).
BI4 has priority and is treated independently of the states of BI1 to BI3. That is, if BI4 is active, the state of BI1
to BI3 is not significant. If BI4 is active, the frequency f4 is transmitted regardless of the state of BI1 to BI3.
The guard tone (f
with specification of the prohibited input combination. The unblocking function can be activated for Mode 4
in the same way as with the other operating modes.
2.7.3.8

Mode 5A (3 Independent Commands)

NOTE
i
i
For this mode, coded tripping is not available.
3 signal inputs are available for the operating mode 3 independent commands. 9 frequencies are needed for
transmitting 3 independent commands via the analog line interface.
At the transmit end, every possible combination of signal inputs BI1 to BI3 is permanently assigned to a
protection frequency.
At the receive end, every protection frequency can be assigned to one or more signal outputs (CO1 to CO4).
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
Logic Scheme for the Mode 4
Transmission
Uncoded
f
g
f
1
f
2
f
3
f
4
f 2)
g
f
4
-
f
s
= Duration of the unblocking impulse) The unblocking pulse is distributed via the
unbl.
) is transmitted in the case of an input error and an entry is generated in the event memory
g
Transmission Command Output
Coded in the Remote
Station without
Unblocking
f -
g
f + f CO1
s 4
f + f CO2
1 4
f + f CO3
2 4
f + f CO4
3 4
-
f 2
g
f + f CO4
3 4
-
Alarm signaling
f + f -
s 7
is transmitted.
g
Functional Description
2.7 Protection Modes
Command Output
in the Remote
Station with
Unblocking
T > 0 1)
unbl.
-
CO1
CO2
CO3
CO4
-
CO4
3) Alarm signaling 1)
unblocking impulse
at RXALR
-
> 0, output of the
unbl.
+
57