ABB Relion 670 series - Page 405

Name Type Values (Range) Unit Description
ZREFRE REAL - Ohm Used reference impedance real part in
Ohm
ZREFIM REAL - Ohm Used reference impedance imaginary part
in Ohm
VRMSSTAT BOOLEAN - - RMS voltage status, TRUE when >
VLimRMS
7.13.7 Detailed interface description
GUID-C7741274-436C-4124-B400-52AEB6E3569B v1
Inputs of sensitive rotor earth fault protection, injection based ROTIPHIZ
•
USV is the analog input for the measured injected voltage. This signal is taken from an AI
output of the pre-processor function block. For example, if the SMAI1 function block is used,
then the output G1AI1 is linked to the input GRP1_A of the pre-processor function block; this
input of the SMAI is linked to the analog voltage channel of TRM which is wired to “U” channel
of REX060.
•
USI is the analog input for the measured injected current. This signal is taken from an AI
output of the pre-processor function block. For example, if the SMAI1 function block is used,
then the output G1AI2 is linked to the input GRP1_B of the pre-processor function block; this
input of the SMAI is linked to the analog voltage channel of TRM that is wired to “I” channel of
REX060.
•
BLOCK is the binary input to block the alarm, start and trip outputs of the function.
• ZREFSEL is the integer input to select the active reference impedance. There is the possibility
to set two different reference impedances.
Outputs of sensitive rotor earth fault protection, injection based ROTIPHIZ
•
TRIP is the binary output that is used as common trip command.
•
TRIPDC is the binary output that is set to logical value one, if the evaluated resistance to
ground is lower than the setting RTrip, using the internal trip time characteristic.
•
TRIPAC is the binary output that is set to logical value one, if an ground fault on the AC side of
the excitation system rectifier lasts for a time that is not shorter than the set trip delay and it
is detected by the protection function.
• BFI is the binary output that is used as common start signal.
•
PU_DC is the binary output that is set to logical value one if the evaluated resistance to
ground is lower than the setting
RTrip .
• PU_DC is the binary output that is set to logical value one if an ground fault is detected on the
AC side of the excitation system rectifier.
•
ALARM is the binary output that is set to logical value one if the evaluated resistance to
ground is lower than the setting RAlarm for a time that is not shorter than the set alarm delay.
•
ERROR is the binary output that is set to logical value one if any error condition is detected.
• ERRSTAT is the integer output that provides a binary coded information about the type of
error. See table 186.
• RAVE is the analog output which is the average measured resistance to ground in Ω (real part
of the average measured impedance).
•
XAVE is the analog output which is the average measured reactance to ground in Ω at the
injected frequency (imaginary part of the average measured impedance).
•
FREQV is the analog output which is the measured frequency of the injected signal.
•
RFAULT is the analog output which is the estimated fault resistance in Ω; this output can also
provide the codes -1000 (if the fault resistance is above 10 kΩ, the code -1000 is initially
provided until the evaluated resistance to ground reaches a stable value) and -2000 (if an
error condition is active).
•
ZREF is an integer output that identifies the active reference impedance.
1MRK 502 066-UUS B Section 7
Impedance protection
399
Technical manual