Siemens 6MD85, Manual

Page: 495 / 1256

With this parameter, you specify the time delay of the fast step down mode. If the actual voltage is greater
than the value of the limit for the fast step down mode (_:122), the fast step down mode is activated. A fast
step down mode is not activated if the voltage limit is exceeded for only a brief period within the time delay.
Parameter: Function monitoring
•
Default setting
(_:124) Function monitoring
=
15 min
You can delay the pickup of the function monitor. With the setting
Function monitoring
=
0 min
, the
function monitor is switched off.
Grid Coupling Transformer Only:
Parameter: Power-flow supervision
•
Default setting
(_:16351:162) Power-flow supervision
=
on
With the
Power-flow supervision
parameter, you monitor the power flow. You can switch the param-
eter on or off.
Parameter: Regulate with T2 at start
•
Default setting
(_:14011:155) Regulate with T2 at start
=
on
With the
Regulate with T2 at start
parameter, you can activate a shorter time than T1. This can be
necessary for controlling a voltage recovery or after switching on a transformer. If voltage was not present
beforehand, this setting controls with the shorter time T2 when starting the control action. You can switch
this functionality on or off. If you always want to use the time T2 for control, you must set the
Block T1
controllable to
On
.
For the three-winding transformer, the address of the
Regulate with T2 at start
parameter is
_:15601:163
while it is
_:16351:163
for the grid coupling transformer.
Parameter: Set point mode active
•
Default setting
(_:14011:160) Set point mode active
=
on
With the
Set point mode active
=
on
parameter, you can send a target voltage to the controller via a
communication network. The voltage controller uses the specified voltage value as target voltage. If the
controller does not receive any valid voltage values, it uses the original target voltage. You can enable or
disable the parameter.
For the three-winding transformer, the address of the parameter
Set point mode active
is
_:15601:171
, for the grid coupling transformer, it is
_:16351:171
.
Line Compensation
Parameter: Line drop compensation
•
Default setting
(_:14011:125) Line drop compensation
=
off
You can use the
Line drop compensation
parameter to select the correction procedure of the load-
dependent line voltage drop. There are 2 procedures available for selection:
LDC-Z
and
LDC-XandR
.
For setting the parameter
Line drop compensation
=
LDC-Z
, consider the following parameter:
Parameter: Target voltage rising
•
Default setting
(_:14011:126) Target voltage rising
=
4.0 %
With the
Target voltage rising
parameter, you set the voltage drop across the line. The value repre-
sents the voltage rising in % of the
Target voltage 1
that occurs at rated load. Only the magnitude of the
current is considered. The set value is added to
Target voltage 1
.
Set point value increase [%] = ΔV
load
[%] if I
load
= 100 %
[foschlst-211013, 2, en_US]
where:
6.9.4.4
Control Functions
6.9 Voltage Controller
SIPROTEC 5, High-Voltage Bay Controller, Manual 495
C53000-G5040-C015-9, Edition 11.2017