Schweitzer Engineering Laboratories SEL-734 - Page 73

4.27
Date Code 20090730 Instruction Manual SEL-734 Meter
Metering
Transformer/Line Loss Compensation
Equation 4.25
Equation 4.26
Equation 4.27
Actual transformer losses for 1000 A load at 11 kV per phase:
NOTE
: The results of Equation 4.30,
Equation 4.31, Equation 4.32, and
Equation 4.33 are added to averaged
power, demand, and energy values
when ETLLC is enabled.
Equation 4.28
Equation 4.29
Equation 4.30
Equation 4.31
Equation 4.32
Equation 4.33
Line losses:
Equation 4.34
Equation 4.35
Load line:
Equation 4.36
Equation 4.37
LVARCU
base
LVACU
base
2
LWCU
base
2
–=
0.666 MVAR=
LVAFE
base
%IMAG
100
---------------------
MVA1
base
• =
6.667 10
3–
MVA• =
LVARFE
base
LVAFE
base
2
LWFE
base
2
–=
4.761 10
3–
MVAR• =
I
actual
I
metered
CTR• 1000 A==
kV
actual
V
metered
PTR• 11 kV==
LWCU
Load
LWCU
base
I
actual
I
base
---------------
⎝⎠
⎛⎞
2
• =
24.2 kW=
LVARCU
Load
LVARCU
base
I
actual
I
base
---------------
⎝⎠
⎛⎞
2
• =
604.516 kVAR=
LWFE
Load
LWFE
base
kV
actual
KVLL
---------------------
⎝⎠
⎛⎞
2
• =
4.667 kW=
LVARFE
Load
LVAFE
base
kV
actual
KVLL
---------------------
⎝⎠
⎛⎞
4
• =
6.667 kVAR=
XFTR
132 kV
11 kV
----------------- 1 2 . 0 0 0 0==
MPOS 3=
T
1
1 if MPOS = 3 or 4=
XFTR otherwise
LLP
losses
I
actual
T
1
• ()
2
LLR• =
1.736=10
3
kW•
Courtesy of NationalSwitchgear.com