ABB ret650 - Transformer Differential Protection, Two Winding T2 WPDIF; Function Block; Identification; Signals

Stabilization is included for inrush and overexcitation currents respectively, cross-
blocking is also available. Adaptive stabilization 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.
Included is an innovative sensitive differential protection element based on the theory
of symmetrical components. This element offers the best possible coverage of power
transformer windings turn to turn faults.
6.1.2 Transformer differential protection, two winding T2WPDIF
6.1.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Transformer differential protection, two-
winding
T2WPDIF
3Id/I
SYMBOL-BB V1 EN
87T
6.1.2.2 Function block
T2WPDIF
I3PW1CT1*
I3PW2CT1*
BLOCK
TRIP
TRIPRES
TRIPUNRE
TRNSUNR
TRNSSENS
START
STL1
STL2
STL3
BLK2H
BLK5H
BLKWAV
IDALARM
IDL1MAG
IDL2MAG
IDL3MAG
IBIAS
IDNSMAG
IEC09000274_1_en.vsd
IEC09000274 V1 EN
Figure 30: T2WPDIF function block
6.1.2.3 Signals
Table 24: T2WPDIF Input signals
Name
Type Default Description
I3PW1CT1 GROUP
SIGNAL
- Three phase current connection winding 1 (W1)
CT1
I3PW2CT1 GROUP
SIGNAL
- Three phase current connection winding 2 (W2)
CT1
BLOCK BOOLEAN 0 Block of function
Section 6 1MRK 504 135-UEN A
Differential protection
80
Technical manual