•
ZREFRE
is the real part (resistance) of the active reference impedance.
•
ZREFIM
is the imaginary part (reactance) of the active reference impedance.
• VRMSSTAT, this output is not used in rotor protection application.
ERRSTAT output signal
Convert the integer output signal to binary and see table below for interpretation of individual
bits:
Table 186: Definition of errors
ERRSTAT output integer
Priority 3 Priority 2 Priority 3 Priority 1
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Interfer-
ence
detected
Under-
current
Under-
voltage
Over-
current
Over-
voltage
Frequ-ency
difference
No current No voltage
The ERRSTAT description will be shown in clear text in ICT.
The priority of the signals is set that the group priority 1 overrides the group priority 2 and 3, and
priority 2 overrides priority 3. Note that the ERRSTAT signal can enable several error cases at the
same time.
Following errors is detected and derived in the Error block:
• B0 = Injected voltage signal not found
• B1 = Injected current signal not found
• B2 = Voltage and current signal frequency differs
• B3 = Measured total RMS voltage too high
• B4 = Measured total RMS current too high
• B5 = Injected voltage signal too low
• B6 = Injected current signal too low
• B7 = External interference voltage detected
ERRSTAT = BitToInt[B7,…,B1,B0] The priority of the error conditions that will be flagged out:
• Prio1 = B0, B1
• Prio2 = B3, B4, B5, B6
• Prio3 = B2, B7
RFAULT output signal
The injection equipment provides calculation of the fault resistance:
• If the fault resistance is equal or below 10 kΩ, RFAULT displays the evaluated resistance to
earth in ohm
• If the fault resistance is above 10 kΩ, RFAULT displays initially the code “-1000” until the
evaluated resistance to earth reaches a stable value, that is displayed in ohm
• If an error condition is active, RFAULT displays the code “-2000”
7.13.8 Operation principle
GUID-08F4DD7A-F635-486D-B36A-1EA17CB40726 v2
Section 7 1MRK 502 066-UUS B
Impedance protection
400
Technical manual
To Next Page
Loading...
