ABB Relion 670 series, Installation And Commissioning Manual

Page: 130 / 260

If more than one reference impedance is to be used there must be a logic
configured to detect such changes in the operation states when the reference
impedance must be changed, and when a change in the function block must be
initiated. The following automatic choices can for example be made:
1. Generator voltage < set value and generator circuit breaker open: Reference
impedance 1
2. Generator voltage > set value and generator circuit breaker open: Reference
impedance 2
3. Generator voltage > set value and generator circuit breaker closed: Reference
impedance 3
For more information see separate application note 1MRG005030 Application
example for injection based 100% Stator EF and Sensitive Rotor EF protection.
Monitoring
In the monitoring part the calibration can be checked by applying the known fault
resistance and compare it with the actual function measurement. It is also possible
to identify operational states where change of reference impedance is required.
Auditing
In the auditing part calibration and commissioning reports are made.
11.3 Launching injection commissioning tool (ICT)
1. To launch the Injection commissioning tool (ICT), right-click REG670 in the
PCM plant structure and select the Injection commissioning .
2. In the ICT toolbar, select the 100% Stator Earth Fault function.
Function selection
dropdown menu
Button for
enable/disable
tripping
Buttons for start/stop
reading from IED
IEC11000043-1-en.vsd
GUID-3C378090-E33E-4AAA-8BBE-09FA872D9A87 V1 EN
Figure 76: ICT toolbar
3. Select the Installing tab if it was not already selected by default after the ICT
was launched.
The first thing that needs to be ensured prior to calibration is that the
measured voltage and current signal on the injected frequency is present/
found, and that the amplitude of these is within the permitted limits.
4. Make sure you have not attached any additional impedance in parallel with
the stator circuit.
Section 11
1MRK 502 029-UEN A
Calibrating injection based 100% stator earth fault protection
124
Installation and commissioning manual