ABB RED650, Applications Manual

Page: 101 / 454

or the first secondary winding of a three-winding transformer. The current
transformer feeding the IED is located at the low voltage side of the transformer.
The parameter is set within the range 0...3, where 0 (zero) is used if no transformer
A is included in the protection zone. This is one of the few settings that can be set
differently for each separate master IED.
The setting specifies the current input on the differential current function block
where the input current must be recalculated, that is, referred to the high voltage
side, which is the reference side of the differential protection. The measured
current, fed to the input channel determined by the setting
TraAOnInpCh , will be
recalculated to I · RatVoltW2TraA / RatVoltW1TraA and shifted counterclockwise by
the angle, determined by the product ClockNumTransA × 30 degrees.
RatVoltW1TraA
M12541-279 v3
The rated voltage (kV) of the primary side (line side = high voltage side) of the
power transformer A.
RatVoltW2TraA
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The rated voltage (kV) of the secondary side (non-line side = low voltage side) of
the power transformer A.
ClockNumTransA
M12541-285 v3
This is the phase shift from primary to secondary side for power transformer A.
The phase shift is given in intervals of 30 degrees, where 1 is -30 degrees, 2 is -60
degrees, and so on. The parameter can be set within the range 0...11.
TraBOnInpCh
M12541-292 v5
This parameter is used to indicate that a power transformer is included in the
protection zone at current terminal Y. This can be either a two-winding transformer
or the second secondary winding of a three-winding transformer. The current
transformer feeding the IED is located at the low voltage side of the transformer.
The parameter is set within the range 0...3, where zero is used if no transformer B
is included in the protection zone.
The setting specifies the current input on the differential current function block
where the input current must be recalculated, that is, referred to the high voltage
side, which is the reference side of the differential protection. The set input
measured current I will be recalculated to I ×
RatVoltW2TraB / RatVoltW1TraB and
shifted counterclockwise by the angle, determined by the product ClockNumTransB
× 30 degrees.
RatVoltW1TraB
M12541-295 v3
The rated voltage (kV) of the primary side (line side = high voltage side) of the
power transformer B.
RatVoltW2TraB
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The rated voltage (kV) of the secondary side (non-line side = low voltage side) of
the power transformer B.
1MRK 505 393-UEN B
Section 6
Differential protection
Line differential protection RED650 2.2 IEC 95
Application manual