inrush and CT saturation during external faults. A high set unrestrained differential
current protection element is included for a very high speed tripping at high internal
fault currents.
Included is an sensitive differential protection element based on the theory of negative
sequence current component. This element offers the best possible coverage of power
transformer windings turn to turn faults.
6.1.3
Function block
IEC06000249_2_en.vsd
T2WPDIF
I3PW1CT1*
I3PW1CT2*
I3PW2CT1*
I3PW2CT2*
TAPOLTC1
OLTC1AL
BLOCK
BLKRES
BLKUNRES
BLKNSUNR
BLKNSSEN
TRIP
TRIPRES
TRIPUNRE
TRNSUNR
TRNSSENS
START
STL1
STL2
STL3
BLK2H
BLK2HL1
BLK2HL2
BLK2HL3
BLK5H
BLK5HL1
BLK5HL2
BLK5HL3
BLKWAV
BLKWAVL1
BLKWAVL2
BLKWAVL3
IDALARM
OPENCT
OPENCTAL
IDL1
IDL2
IDL3
IDL1MAG
IDL2MAG
IDL3MAG
IBIAS
IDNSMAG
IEC06000249 V2 EN
Figure 30:
T2WPDIF function block
1MRK502052-UEN B
Section 6
Differential protection
103
Technical manual
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