Additional Parameters for the Three-Winding Transformer and for the Grid Coupling Transformer
Parameter: Line drop compensation
•
Default setting
(_:125) Line drop compensation
=
off
For setting the parameter
Line drop compensation
=
LDC-Z
, consider the following parameters:
Parameter: Target voltage rising w1
•
Default setting
(_:126) Target voltage rising w1
=
4.0 %
Parameter: Target voltage rising w2
•
Default setting
(_:147) Target voltage rising w2
=
4.0 %
Parameter: Max load current
•
Default setting
(_:127) Max load current
=
100.0 %
For setting the parameter
Line drop compensation
=
LDC-XandR
, consider the following parameters:
Parameter: R line w1
•
Default setting
(_:153) R line w1
=
0.0 Ω
Parameter: R line w2
•
Default setting
(_:155) R line w2
=
0.0 Ω
Parameter: X line w1
•
Default setting
(_:154) X line w1
=
0.0 Ω
Parameter: X line w2
•
Default setting
(_:156) X line w2
=
0.0 Ω
Limiting Values
Parameter: Lower tap-position limit
•
Default setting
(_:14011:102) Lower tap-position limit
=
1
Parameter: Higher tap-position limit
•
Default setting
(_:14011:103) Higher tap-position limit
=
1
With the parameters
Lower tap-position limit
and
Higher tap-position limit
, you can restrict
the taps available in automatic operation. For example, using the parameter
Higher tap-position
limit
, changes to higher taps to excessive ratios that would result in overvoltages in the event of a sudden
loss of load are blocked.
Parameter: Vmin limiting
•
Default setting
(_:14011:128) Vmin limiting
=
on
Parameter: Vmin threshold
•
Default setting
(_:14011:129) Vmin threshold
=
105.000 V
Parameter: Vmin time delay
•
Default setting
(_:14011:130) Vmin time delay
=
10 s
Parameter: Vmax limiting
•
Default setting
(_:14011:131) Vmax limiting
=
on
Parameter: Vmax threshold
•
Default setting
(_:14011:132) Vmax threshold
=
115.000 V
Parameter: Vmax time delay
•
Default setting
(_:14011:133) Vmax time delay
=
10 s
The voltage limits are necessary only for special control situations. The overvoltage limit prevents a change to
a higher tap by the voltage controller if the limiting value
Vmax threshold
is exceeded. The undervoltage
limit prevents a change to a lower tap by the voltage controller if the voltage drops below the limiting value
Vmin threshold
.
6.9.4.5
Control Functions
6.9 Voltage Controller
498
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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