ABB RELION REX640 Technical Manual page 1582

Section 9
Control functions
1576
U3P
IRES
URES
COIL_POS
COIL_STS
FIXCOIL_STS
RESISTOR_STS
HIGH_LIMIT
LOW_LIMIT
ST_CALIB
ST_TUNING
ST_RESIS_SEQ
RAISE_LOCAL
LOWER_LOCAL
BLK_AUTO
BLK_MANUAL
BLK_RESISTOR
GUID-B30E3663-1405-4FEA-9B1A-46E1C8EA6BB7 V1 EN
Figure 819: Functional module diagram
Measurement selection
PASANCR supports two possibilities for zero-sequence voltage and coil position
measurement.
Voltage measurement setting is used to define the location of voltage measurement:
from busbar or from coil. Busbar measurement is usually an open-delta connection of
phase-to-earth voltage transformers. Coil measurement is available from the arc
suppression coil's measurement winding.
Position Meas mode setting is used to select the measurement between coil position
indication and coil position indication with a CT or sensor. "Pos. indication" option
uses the potentiometer-based COIL_POS information only. If "Pos. ind. and meas."
option is selected, the measured IRES is used for the control algorithm. In this case,
the COIL_POS signal works as a backup and is switched automatically into use if the
coil is disconnected from the network.
Level detector
Level detector op setting is used to enable or disable the Level detector module.
"Enable" means that the Level detector module is enabled and can be used to start the
tuning procedure.
When "Disable" is selected, the automatic coil tuning procedure can
be started with input ST_TUNING.
Level detector's main task is to release the coil automatic tuning procedure in case of
network switching operation. After every successful tuning procedure, the measured
Coil
commissionin g
Measurement Coil automatic
selectio n tuning
Coil ma nual
Level detecto r
tuning
Networ k
Resistor
para me ter s
control
calculation
1MRS759142 C
RAISE_OWN
LOWER_OWN
FIXCOIL
OP_FIXCOIL
CL_FIXCOIL
RESISTOR
OP_RESISTOR
CL_RESISTOR
ALARM
MOT_ALARM
POT_ALARM
EARTH_FAULT
TUNING_ACT
REX640
Technical Manual