Settings - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
7.3.3.2
Transformer protection RET670 2.2 ANSI
Application manual
I3PW1CT1: Phase currents for winding 1 first current transformer set.
I3PW1CT2: Phase currents for winding1 second current transformer set for multi-
breaker arrangements. When not required configure input to "GRP-OFF".
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.
PICKUP: The pickup output indicates that Idiff is in the operate region of the
characteristic.
TRIP: The trip output is activated when all operating criteria are fulfilled.
DIR_INT: 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 (87N) are set via the local HMI or PCM600.
Common base IED values for primary current (IBase), primary voltage (VBase) 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 (87N) can be switched Enabled/Disabled.
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 grounded winding.
Section 7
Differential protection
M13052-28 v13
M13052-17 v8
M13052-21 v9
183