3-106 UR FAMILY – COMMUNICATIONS GUIDE
MODEL IMPLEMENTATION CONFORMANCE STATEMENT (MICS) CHAPTER 3: IEC 61850 COMMUNICATION
3
3.5.2.75  Transformer percent differential (PctDif)
This element is instantiated in the following products: G30, T35, T60.
Table 3-125: Transformer percent differential data objects
setSrcRef ObjectReference SP INST DIFF BLOCK. reference to the data attribute to input R/C
setSrcCB ObjectReference SP source GoCB of input if via GOOSE R/C
LNName: PctDifPDIF1 LDevice inst: Prot UR element: Transformer Percent Differential function
data obj. data attribute Type FC UR Name Description R/W/C
Op ACT XFMR PCNT DIFF OP , XFMR PCNT DIFF OP 
A, XFMR PCNT DIFF OP B & XFMR PCNT 
DIFF OP  C operands
R
general BOOLEAN ST XFMR PCNT DIFF OP R
phsA BOOLEAN ST XFMR PCNT DIFF OP A R
phsB BOOLEAN ST XFMR PCNT DIFF OP B R
phsC BOOLEAN ST XFMR PCNT DIFF OP C R
Blk2ndHφ SPS XFMR PCNT DIFF 2ND θ operand R
stVal BOOLEAN ST XFMR PCNT DIFF 2ND θ R
Blk5thHφ SPS XFMR PCNT DIFF 5TH  θ operand R
stVal BOOLEAN ST XFMR PCNT DIFF 5TH θ R
Str ACD XFMR PCNT DIFF PKP A, XFMR PCNT DIFF 
PKP B & XFMR PCNT DIFF PKP C operand
R
general BOOLEAN ST logical OR of phsA, phsB & phsB R
dirGeneral ENUMERATED ST 0 R
phsA BOOLEAN ST XFMR PCNT DIFF PKP A R
dirPhsA ENUMERATED ST 0 R
phsB BOOLEAN ST XFMR PCNT DIFF PKP B R
dirPhsB ENUMERATED ST 0 R
phsC BOOLEAN ST XFMR PCNT DIFF PKP C R
dirPhsC ENUMERATED ST 0 R
RefWindin
g
INS Number of winding used as the reference 
winding for ratio compensation
R
stVal INT32 ST REFERENCE WINDING R
units Unit CF R
units.SIUnit ENUMERATED 1, the code for dimensionless R
units.multiplier ENUMERATED 0, the code for a multiplier of 1 R
DifAClc WYE Phase differential currents R
phsθ CMV R
phsθ.instCVal Vector MX R
phsθ.instCVal.mag
   .f
FLOAT32 DIFF PHASOR Iθd magnitude, in 
pu
R
phsθ.instCVal.ang
   .f
FLOAT32 DIFF PHASOR UR range -180...+180 converted to 0...360R
phsθ.cVal Vector MX R
phsθ.cVal.mag.f FLOAT32 DIFF PHASOR Iθd magnitude, in 
pu, with deadband
R
phsθ.cVal.ang.f FLOAT32 DIFF PHASOR UR range -180...+180 converted to 0...360R
phsθ.units Unit CF R
phsθ.units.SIUnit ENUMERATED 1, the code for dimensionless R
phsθ.units
   .multiplier
ENUMERATED -2, the code for a multiplier of Centi R
phsθ
.db INT32U CF PctDifPDIF1.DifAClc.phsθ.db R/W/C
phsθ.dbAng INT32U CF PctDifPDIF1.DifAClc.phsθ.dbAng R/W/C
phsθ.zeroDb INT32U CF 4 R
LNName: PiDifPDIF1 LDevice inst: Prot UR element: Transformer Instantaneous Differential # function
data obj. data attribute Type FC UR Name Description R/W/C