Transformer Differential Protection, Three Winding T3Wpdif; (87T); Identification; Function Block - ABB REG650 Technical Manual

Section 6
Differential protection
6.1.2
6.1.2.1
6.1.2.2
78
without load tap changer as well as for shunt reactors including local feeders within the
station. An adaptive stabilizing feature is included to avoid misoperations during for
heavy through-faults.
Harmonic restraint is included for inrush currents as well as for overexcitation
conditions. Adaptive harmonic restraint is also included for system recovery inrush and
CT saturation during external faults. A high set unrestrained differential current
protection element is included for a very high speed tripping at a high internal fault
currents.
An innovative sensitive differential protection feature, based on the theory of
symmetrical components, offers the best possible coverage for power transformer
winding turn-to-turn faults.

Transformer differential protection, three winding T3WPDIF

(87T)

Identification

Function description
Transformer differential protection,
three-winding

Function block

T3WPDIF (87T)
I3PW1CT1* TRIP
I3PW2CT1* TRIPRES
I3PW3CT1* TRIPUNRE
BLOCK TRNSUNR
TRNSSENS
PICKUP
PU_A
PU_B
PU_C
BLK2H
BLK5H
BLKWAV
IDALARM
IDMAG_A
IDMAG_B
IDMAG_C
IBIAS
IDMAG_NS
ANSI09000269-1-en.vsd
ANSI09000269 V1 EN
Figure 30: T3WPDIF (87T) function block
IEC 61850 IEC 60617
identification identification
T3WPDIF
3Id/I
SYMBOL-BB V1 EN
1MRK 502 043-UUS B
ANSI/IEEE C37.2
device number
87T
Technical Manual