Siemens 6MD85, Manual

Page: 499 / 1256

Additional Parameters for the Three-Winding Transformer and for the Grid Coupling Transformer
Parameter: Vmin threshold w1
•
Default setting
(_:129) Vmin threshold w1
=
105.000 V
Parameter: Vmin threshold w2
•
Default setting
(_:148) Vmin threshold w2
=
105.000 V
Parameter: Vmax threshold w1
•
Default setting
(_:132) Vmax threshold w1
=
115.000 V
Parameter: Vmax threshold w2
•
Default setting
(_:149) Vmax threshold w2
=
115.000 V
Blockings
Parameter: Blocking behavior
•
Default setting
(_:14011:134) Blocking behavior
=
Auto-Manual
If the corresponding voltage limits are exceeded in either direction, the blockings prevent a change to a lower
or higher tap. On the one hand, this prevents excessive wear of the contacts of the tap changer and, on the
other hand, it prevents a system incident. With the parameter
Blocking behavior
, you set whether these
blockings are effective only in automatic operation or in both automatic and manual operation.
Parameter: V< Blocking
•
Default setting
(_:14011:135) V< Blocking
=
on
Parameter: V< Threshold
•
Default setting
(_:14011:136) V< Threshold
=
90.000 V
Parameter: V< Time delay
•
Default setting
(_:14011:137) V< Time delay
=
0 s
Parameter: I> Blocking
•
Default setting
(_:14011:138) I> Blocking
=
on
Parameter: I> Threshold
•
Default setting
(_:14011:139) I> Threshold
=
150 %
Parameter: I> Time delay
•
Default setting
(_:14011:140) I> Time delay
=
0 s
If the load current exceeds the threshold value
I> Threshold
for the time
I> Time delay
, the overcur-
rent blocking prevents changing to a higher or lower tap. Set the threshold value
I> Threshold
in % in rela-
tion to the rated current. To do this, set the parameter
I reference
for % values.
Parameter: I< Blocking
•
Default setting
(_:14011:141) I< Blocking
=
off
Parameter: I< Threshold
•
Default setting
(_:14011:142) I< Threshold
=
10 %
Parameter: I< Time delay
•
Default setting
(_:14011:143) I< Time delay
=
10 s
If the load current drops below the threshold value
I< Threshold
for the time
I< Time delay
, the under-
current blocking prevents changing to a higher or lower tap. Set the threshold value
I< Threshold
in % in
relation to the rated current. To do this, set the parameter
I reference
for % values.
6.9.4.6
Control Functions
6.9 Voltage Controller
SIPROTEC 5, High-Voltage Bay Controller, Manual 499
C53000-G5040-C015-9, Edition 11.2017