The 100% stator earth fault protection requires the injection unit REX060 and optional shunt
resistor unit REX062 for correct operation.
7.14.3
Detailed interface description
GUID-4F724FE7-1DCC-449C-8887-6DBF64268279 v1
Inputs of 100% stator earth fault protection, injection based STTIPHIZ
•
USV is the analog input for the measured injected voltage. This signal is taken from an AI
output of the pre-processor function block. If for example 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 that 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. If for example 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 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 five different reference impedances.
Outputs of 100% stator earth fault protection, injection based STTIPHIZ
•
TRIP is the binary output that is used as trip command; this binary output is set to logical
value one if the evaluated resistance to ground is lower than the setting
RTrip, using the
internal trip time characteristic.
•
BFI is the binary output that is used as start signal; this binary output is set to logical value
one if the evaluated resistance to ground is lower than the setting
RTrip.
•
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
•
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.
•
ZREFRE is the real part (resistance) of the active reference impedance.
•
ZREFIM is the imaginary part (reactance) of the active reference impedance.
•
VRMSSTAT, this binary output is set to logical value one if the measured RMS voltage is larger
than the set limit
ULimRMS.
ERRSTAT output signal
Convert the integer output signal to binary and see table below for interpretation of individual
bits:
Section 7
1MRK 502 066-UUS B
Impedance protection
410
Technical manual
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