Description Of The Protection Operating Modes; Overview; Mode 1 (Double System Protection) - Siemens SWT 3000 Equipment Manual

The unblocking function is activated when the time for the unblocking impulse is more than 0 ms (t
ms).

Description of the Protection Operating Modes

2.7.3
2.7.3.1

Overview

The following abbreviations are used in the description of the modes.
Uncoded
Coded
t
unbl.
BI[x]
CO[x]
2.7.3.2

Mode 1 (Double System Protection)

Table 2-4
Activated Input
All off
BI1
BI2
BI1 + BI2
BI3
-
BI4 4)
USYNC 5)
1) If an invalid frequency or code is received, or in case of guard tone alarm: If t
unblocking impulse (t
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)
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
Frequencies to be transmitted in the uncoded mode:
•
f is the guard tone
g
•
f is the frequency for clock synchronization
s
Frequencies to be transmitted in the coded mode:
•
f is the guard tone
g
Duration of the unblocking impulse:
•
unblocking inactive when t
•
unblocking active when t
Binary input 1 to 4
Command output 1 to 4
Logic Scheme for the Mode 1
Transmis- Transmission
sion Coded
Uncoded
f f
g g
f f + f
1 s 4
f f + f
2 s 5
f f + f
4 s 6
x 2) x 2)
- -
f f
g g
f f + f
s s 7
= Duration of the unblocking impulse)
unbl.
= 0
unbl.
> 0
unbl.
Command Output in the
Remote Station without
Unblocking
-
CO1 + CO3
CO2 + CO4
CO1 + CO2 + CO3 + CO4
-
Alarm signaling 3)
-
-
Functional Description
2.7 Protection Modes
> 0
unbl.
Command Output in the
Remote Station with
Unblocking
T > 0 1)
unbl.
CO3
CO1
CO2
CO1 + CO2
-
Alarm signaling +
unblocking impulse at CO4
CO3
-
> 0, output of the
unbl.
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