ABB RELION 670 SERIES REG670 - Setting Guidelines; Setting Injection Unit REX060

Accuracy for STTIPHIZ (64S) is installation dependent and it mainly depends on the
characteristic of grounding or voltage transformer used to inject signal into the stator.
Note that lar
ge variation of the ambient temperature and variation of stator capacitance
and conductance to ground between standstill and fully loaded machine will also limit
the possible setting level for the alarm stage. As a consequence 10 kΩ sensitivity can
be typically reached without problem. Depending on particular installation alarm
sensitivity of up to 50 kΩ may be reached at steady state operating condition of the
machine.
Note that it is possible to connect two REG670 in parallel to the REX060 injection unit
in order to obtain redundant measurement in two separate IEDs. However, at
commissioning both REG670 IEDs must be connected during calibration procedure.
8.8.3 Setting guidelines
8.8.3.1 Setting injection unit REX060
GUID-9B35DD88-A681-47EB-B8C3-AAAEA25B598F v1
The 100% stator earth fault protection module in the REX060 generate a square wave
signal for injection into the stator windings of the generator via the neutral point. The
injected voltage and current are connected to the measurement parts of REX060. The
signals are amplified giving voltage signals for both the injected voltage and current,
adapted to analogue inputs of IED.
Frequency, current and voltage gain are settable and stored in non-volatile memory. If
value is outside range, then the limited value will be stored. Last stored settings are
shown in display.
Table 32: Necessary settings for REX060
Setting Range
System frequency 50/60 Hz
Injected frequency 50 to 250 Hz
VmaxEF [V] Four steps for the 100% stator earth fault
protection
Injection frequency can be set as integer in range 50 to 250 Hz. When selected, only
one digit can be adjusted at the time by the Up or Down buttons. Store the new value
by Enter button, or alternatively recover to the last stored value by Clear button.
Gain setting can be set in four discreet steps for SIM in the main menu. These
selectable steps, in turn result in pre defined voltage and current gain factors. The gain
can be adjusted by the Up or Down buttons when selected. Store the new gain by the
Enter button, or alternatively recover to the last stored gain by the Clear button.
Section 8 1MRK 502 071-UUS A
Impedance protection
326 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual