ABB RET670 Applications Manual page 138

Section 3
IED application
132
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. Can be used, for example,
to block for a limited time the operation during special service conditions.
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. It can be used to initiate disturbance recorder.
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.
Output can be used for information purpose normally during testing. It can, for
example, be checked from the debug tool or connected as a signal to the disturbance
recorder. Information available on local HMI and debug using Application
Configuration Tool.
BLK2H: The output is activated when the function is blocked due to too high level of
second harmonic. Output can be used for information purpose normally during testing.
It can, for example, be checked from the debug tool or connected as a signal to the
disturbance recorder. Information available on local HMI and debug using Application
Configuration Tool.
Setting parameters
The parameters for the restricted earth-fault protection, low impedance function
REFPDIF (87N) are set via the local HMI or PCM600.
Operation: The operation of REFPDIF (87N) can be switched Enabled/Disabled.
IBase: The IBase setting is the setting of the base (per unit) current on which all
percentage settings are based. Normally the protected power transformer winding rated
current is used but alternatively the current transformer primary rated current can be set.
1MRK504116-UUS C
Application manual