Settings - ABB REG670 Applications Manual

1MRK 502 071-UEN -
7.4.3.2
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
I3PW2CT1: Phase currents for winding 2 first current transformer set. Used for
autotransformers.
I3PW2CT2: Phase currents for winding 2 second current transformer set for multi-
breaker arrangements. Used when protecting an autotransformer. When not required,
configure input to "GRP-OFF".
Recommendation for Binary input signals
Refer to the pre-configured configurations for details.
BLOCK: The input will block the operation of the function. It can be used, for
example, to block the operation during special service conditions for a limited time.
Recommendation for output signals
Refer to pre-configured configurations for details.
START: The start output indicates that Idiff is in the operate region of the
characteristic.
TRIP: The trip output is activated when all operating criteria are fulfilled.
DIROK: The output is activated when the directional criteria has been fulfilled.
BLK2H: The output is activated when the function is blocked due to high level of
second harmonic.

Settings

The parameters for the restricted earth fault protection, low impedance function
REFPDIF are set via the local HMI or PCM600.
Common base IED values for primary current (IBase), primary voltage (UBase) and
primary power (SBase) are set in a Global base values for settings function
GBASVAL.
GlobalBaseSel: It is used to select a GBASVAL function for reference of base values.
Operation: The operation of REFPDIF can be switched On/Off.
IdMin: The setting gives the minimum operation value. The setting is in percent of the
IBase value of the chosen GlobalBaseSel. For function operation, the neutral current
must be larger than half of this value. A recommended setting is 30% of power
transformer-winding rated current for a solidly earthed winding.
ROA: Relay operate angle for zero sequence directional feature. It is used to
differentiate an internal fault and an external fault based on measured zero sequence
current and neutral current.
CTFactorPri1: A factor to allow a sensitive function also at multi-breaker
arrangement where the rating in the bay is much higher than the rated current of the
transformer winding. The stabilizing can then be high so an unnecessary high fault
Section 7
Differential protection
181