Siemens 6MD85, Manual

Page: 801 / 1256

Blocking the Stage
In the event of blocking, the picked up stage will be reset. Blocking is possible externally or internally via the
binary input signal
>Block stage
.
Application and Setting Notes
Parameter: Method of measurement
•
Recommended setting value
(_:391:8) Method of measurement
=
fundamental comp.
Use the
Method of measurement
parameter to define whether the tripping stage uses the fundamental
component (standard method = default setting) or the calculated RMS value.
Parameter Value Description
fundamental comp.
Select this method of measurement to suppress harmonics or transient
voltage peaks.
Siemens recommends this method of measurement as the default setting.
RMS value
Select this method of measurement if you want the stage to take harmonics
into account (for example at capacitor banks). Do not set the
threshold
value
of the tripping stage under 10 V for this method of measurement.
Parameter: Measured value
•
Default setting
(_:391:9) Measured value
=
VA measured
The
Measured value
parameter is used to specify which voltage is monitored by the stage.
The scope of setting options depends on the connection type for the voltage transformers and the routing of
the measured values to the terminals of the voltage measuring point. You can find connection examples for
voltage transformers in the Appendix.
The following setting options can be available:
•
Measured phase-to-ground voltage V
A
(
VA measured
)
•
Measured phase-to-ground voltage V
B
(
VB measured
)
•
Measured phase-to-ground voltage V
C
(
VC measured
)
•
Measured phase-to-phase voltage V
AB
(
VAB measured
)
•
Measured phase-to-phase voltage V
BC
(
VBC measured
)
•
Measured phase-to-phase voltage V
CA
(
VCA measured
)
•
Calculated phase-to-phase voltage V
AB
(
VAB calculated
)
•
Calculated phase-to-phase voltage V
BC
(
VBC calculated
)
•
Calculated phase-to-phase voltage V
CA
(
VCA calculated
)
•
Calculated voltage V0 (
V0 calculated
)
The selection depends on the corresponding application.
7.15.4
Protection and Automation Functions
7.15 Overvoltage Protection with Any Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual 801
C53000-G5040-C015-9, Edition 11.2017