Siemens 6MD85, Manual

Page: 385 / 1256

Sync. operating mode Async. operating mode Description
off on
Regardless of the frequency difference and the
threshold value
f-threshold ASYN<->SYN
, the
operating mode active is exclusively asynchronous.
The closing time of the circuit breaker is this always
taken into account for determining the connecting
point.
Select this operating mode if you wish to activate
machines, for example generators or asynchronous
motors.
If the same frequency is present on the sides to be
interconnected, then this operating mode is not
possible. Since, in the case of dependency on the
phase angle position (Δα), release of the closure may
not be issued.
on off
Use this operating mode for galvanically connected
systems.
Closure is only possible with synchronous systems
(with low Δf).
off off
Both operating modes are deactivated. No closing
release can be therefore be given via this operating
mode.
This configuration is only advisable for special applica-
tions. Select this operating mode if you only wish to
switch, for example de-energized parts of the power
system.
Parameter for asynchronous operation: Max. voltage diff. of voltage and frequency
•
Default setting
(_:5041:115) Max. voltage diff. V2>V1
=
2.0 V
•
Default setting
(_:5041:116) Max. voltage diff. V2<V1
=
2.0 V
•
Default setting
(_:5041:117) Max. frequency diff. f2>f1
=
0.10 Hz
•
Default setting
(_:5041:118) Max. frequency diff. f2<f1
=
0.10 Hz
For information, see Parameter for synchronous operation
Parameter for synchronous operation: Maximum voltage diff. of voltage and angle
•
Default setting
(_:5041:122) Max. voltage diff. V2>V1
=
5.0 V
•
Default setting
(_:5041:123) Max. voltage diff. V2<V1
=
5.0 V
•
Default setting
(_:5041:124) Max. angle diff. α2>α1
=
10
o
•
Default setting
(_:5041:125) Max. angle diff. α2<α1
=
10
o
2 parameters are available for the differential values voltage, frequency, and angle. Unbalanced closing ranges
can be set with this, if required.
The permissible differential values must ensure that no protection tripping or damage occurs in the system
owing to compensation processes (circulating current) and power swings after interconnection of the parts of
the power system. The settings must not be configured too closely on the other side so that necessary
closures are not blocked.
Typical differential values are selected in the default setting. Depending on the system, the settings must be
checked and adjusted, if necessary.
Parameter: Switchover between synchronous and asynchronous operation
•
Recommended setting value
(_:5041:120) f-threshold ASYN<->SYN
=
0.01 Hz
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 385
C53000-G5040-C015-9, Edition 11.2017