The unblocking function is activated when the time for the unblocking impulse is more than 0 ms (t
unbl.
> 0
ms).
Description of the Protection Operating Modes
Overview
The following abbreviations are used in the description of the modes.
Uncoded
Frequencies to be transmitted in the uncoded mode:
•
f
g
is the guard tone
•
f
s
is the frequency for clock synchronization
Coded
Frequencies to be transmitted in the coded mode:
•
f
g
is the guard tone
t
unbl.
Duration of the unblocking impulse:
•
unblocking inactive when t
unbl.
= 0
•
unblocking active when t
unbl.
> 0
BI[x]
Binary input 1 to 4
CO[x]
Command output 1 to 4
Mode 1 (Double System Protection)
Table 2-4
Logic Scheme for the Mode 1
Activated Input
Transmis-
sion
Uncoded
Transmission
Coded
Command Output in the
Remote Station without
Unblocking
Command Output in the
Remote Station with
Unblocking
T
unbl.
> 0
1)
All off
f
g
f
g
-
CO3
BI1
f
1
f
s
+ f
4
CO1 + CO3
CO1
BI2
f
2
f
s
+ f
5
CO2 + CO4
CO2
BI1 + BI2
f
4
f
s
+ f
6
CO1 + CO2 + CO3 + CO4
CO1 + CO2
BI3
x
2)
x
2)
-
-
-
-
-
Alarm signaling
3)
Alarm sig
unblocking impulse at CO4
BI4
4)
f
g
f
g
-
CO3
USYNC
5)
f
s
f
s
+ f
7
-
-
1)
If an invalid frequency or code is received, or in case of guard tone alarm: If t
unbl.
> 0, output of the
unblocking impulse (t
unbl.
= Duration of the unblocking impulse)
2)
x = No reaction (does not trigger alarm)
3)
If an invalid frequency or code is received or in case of guard tone alarm
4)
With AMP operation (PLC connection), signal S6 is also activated through BI4 = on and voice transmission is
interrupted.
5)
Clock synchronization (USYNC)
2.7.3
2.7.3.1
2.7.3.2
Functional Description
2.7 Protection Modes
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
51
C53000-G6040-C605-1, Edition 03.2020