Limiting Values - Siemens 6MD85 Manual

Control Functions
6.9 Voltage Controller
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
6.9.4.5

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.
498 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017