ABB RELION REX640, Техническое руководство, Страница: 1731 / 1960

9.11.4 Analog channel configuration
PASANCR has three analog group inputs which must be properly configured.
Table 1589: Analog inputs
Input Description
U3P Three-phase voltages
IRES
1
Residual current (measured or calculated)
URES Residual voltage (measured)
See the preprocessing function blocks in this document for the possible
signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
9.11.5 Controller connections
Voltages
PASANCR supports zero-sequence voltage measurement from busbar or from
coil. Busbar measurement is, for example, an open-delta connection of phase-
to-earth voltage transformers. Coil measurement uses the coil's own secondary
measurement winding.
Voltage measurement setting is used to select the active
measurement. Available options are "Busbar" and "Coil".
Phase-to-phase voltage AB must be connected to the controller. If only the phase
voltages are measured, the voltage U_AB is calculated internally in the protection
relay.
Coil position
The controller supports two possibilities for the coil position measurement.
Position Meas mode setting is used to select the active coil position measurement.
Available options are:
• "Pos. indication": Using only the RTD input module to measure the resistance
value from the arc suppression coil potentiometer with
COIL_POS
input and to
convert it into corresponding coil position according to the linearization table.
• "Pos. ind. and meas.": Using both
COIL_POS
and
IRES
signals.
IRES
is arc
suppression coil current measurement using conventional CTs or sensors. Special
attention should be paid to the accuracy of the current signals at low amplitudes.
Additionally, high accuracy can be ensured by applying measurement class CTs
and sensors. Accurate current measurement improves controller speed and
1
The possible connection options are measured IRES from the coil/main transformer neutral
point, calculated IRES from the phase CTs of earthing transformer, or GRPOFF. If GRPOFF is
connected to IRES, the
Position Meas mode is restricted to "Pos. indication" only.
1MRS759142 F Control functions
REX640
Technical Manual
1731