Functionality - ABB RELION REX640 Technical Manual

1MRS759142 C
9.11.3
9.11.4
REX640
Technical Manual

Functionality

The Petersen coil controller function PASANCR is a numerical automatic controller
for the continuously adjustable arc suppression coil (ASC or Petersen coil) and the
parallel resistor of the coil. It can be applied to compensated networks where an earth-
fault current raising resistor is optionally connected in parallel with the arc
suppression coil.
PASANCR is intended for controlling arc suppression coils in networks with natural
asymmetry, for example, mixed overhead line and cable networks. The main features
of the function are:
• Operation based on forced change in zero-sequence voltage
• Arc suppression coil tuning to the desired position
• Network parameter calculation and displaying of the resonance curve and the
fault current estimate curve of the network
• Control of the parallel resistor
• Clear numerical value of the resonance point steady-state zero-sequence voltage,
for example, for earth-fault protection purposes
Analog channel configuration
PASANCR has three analog group inputs which must be properly configured.
Table 1428: Analog inputs
Input
U3P
1)
IRES
URES
1) IRES must always be connected irrespective of the setting value of
options are measured IRES from the coil/main transformer neutral point or calculated IRES from the
phase CTs of earthing transformer.
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.
Control functions
Description
Three-phase voltages
Residual current (measured or calculated)
Residual voltage (measured)
Position Meas mode . The possible
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