53
FRAX Software
© 2011 Megger Sweden AB
2
1
0
)
(
-
)
(
N
K
k
Y
k
Y
N
1
X(k)
N
1
-
X(k)
N
1
C
2
1
N
0
K
1
N
0
K
x Y
A.3
Calculate the normalization covariance factor of these two sequences
y
x
D
D
/
C
LR
x y
x y
A.4
Calculate the relative factor Rxy meeting the project requirements as per the
following formula:
others
LR
g
LR
X Y
xy
)
1
(
1
10
1
10
R
1 0
x y
A.5
Judge the degree of deformation of transformer winding as per Table A.1
Table A.1 Relation between relative factors and degree of transformer winding
deformation (only for reference)
Winding Deformation degree
Relative Factors
R
Severe Deformation
R
LF
< 0.6
Obvious Deformation
1.0>
R
LF
0.6 or
R
MF
< 0.6
Slight Deformation
2.0>
R
LF
1.0 or 0.6
R
MF
< 1.0
Normal Winding
R
LF
2.0,
R
MF
1.0 and
R
HF
0.6
R
LF
represents the relative factor when the curve is in low frequency band (1kHz~100kHz);
R
MF
represents the relative factor when the curve is in medium frequency band
(100kHz~600kHz);
R
HF
represents the relative factor when the curve is in high frequency band
(600kHz~1000kHz).
4.3.7.2
Correlation Analysis
The Correlation analyzer is by default a copy of the DL/T 911-2004 analyzer. It uses the same
calculations to get the values. The difference is that it is possible to create and change limits
and frequency ranges to create a custom analyzer.
Use the test browser to select the two curves you want to compare. If more than two curves
are selected, the analyzer will only display the first two curves selected. The calculations are
performed automatically and the "Conclusion" is presented below the table.
