ABB Relion 670 series, Applications Manual

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IEC15000451-1-en.vsd
RED
670
RED
670
A
B
T
T
Protected zone
IEC15000451 V1 EN-US
Figure 61: One three–winding transformer in the protected zone
TraAOnInpCh
M12541-239 v6
This parameter is used to indicate that a power transformer is included in the protection zone
at current terminal X. This can be either a two-winding transformer 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 or 0...6,
where 0 (zero) is used if no transformer A is included in the protection zone. This is the only
setting that is different for each separate 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
M12541-282 v3
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 or 0...6,
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.
1MRK 505 343-UEN B Section 6
Differential protection
131
Application manual