9.11.6.5 Coil manual tuning
PASANCR supports manual coil tuning when
Controller mode
setting is "Manual".
Manual control is achieved by activating RAISE_LOCAL and LOWER_LOCAL inputs
which activate the corresponding RAISE_OWN and LOWER_OWN outputs. The
manual mode and the corresponding inputs can be activated, for example, via
HMI application. Moreover, the manual control of the coil can be achieved via
communication by using the
Coil Target Pos
setting. Once the setting is committed,
the controller moves to the desired position. Also the activated operating limits
can restrict the coil movement. The MOT_ALARM output is activated during manual
control if the coil position is not changed due to activated RAISE_OWN and
LOWER_OWN commands. The ALARM output is activated when the movement of the
coil is in wrong direction or both end switches indicate simultaneously enabled
signaling.
Coil manual movement is possible only after calibration.
During the manual control mode the network resonance curve is not
updated automatically. The previous automatically detected resonance
curve is displayed on the HMI view.
It is possible to manually control the connection status of the fixed parallel coil with
Fix coil type
setting by selecting "ON" or "OFF". The setting can be changed via the
settings menu or HMI application.
9.11.6.6 Resistor control
Zero-sequence currents in compensated networks are usually very low, making it
difficult to select the faulty line. To avoid sensitivity problems, the parallel resistor
of the ASC is often used to increase the zero-sequence current allowing a simple
earth-fault protection to locate the faulty line. PASANCR contains a functionality to
switch the resistor on and off automatically or on user input.
First, the resistor installation status is set with
Parallel resistor
setting. The available
options are "True" and "False". If the parallel resistor is installed in the system, the
value is selected with
Resistor Nom value
setting. Second, the nominal voltage level
of the power auxiliary winding is selected with
Auxiliary Wnd V Nom
setting.
The
Resistor control
setting is used to enable the automatic control sequence or to
connect or disconnect the resistor. The automatic control sequence is released if
the functionality is enabled (
Resistor control
= "Automatic") and the EARTH_FAULT
output is active. The resistor control sequence after the earth-fault indication
depends on the resistor connection status during the healthy state. The healthy-
state status is selected with the
Resistor healthy St
setting. The available options
are "On" and "Off". The settings affecting the control sequence are explained in
Figure 928
.
1MRS759142 F
Control functions
REX640
Technical Manual
1743
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