Schweitzer Engineering Laboratories SEL-734 - Load Profile Report

4.28
SEL-734 Meter Instruction Manual Date Code 20090730
Metering
Load Profile Report
Equation 4.38
Supply line:
Equation 4.39
Equation 4.40
Equation 4.41
where:
LLP and SLP are line watt losses.
LLQ and SLQ are line VAR losses.
Calculating
Transformer Test
Specifications
The transformer loss inputs of the SEL-734 are designed for user convenience
and do not require any calculations. If these inputs are unknown, use percent
transformer losses to calculate the required transformer test data. The
following equations detail the process of calculating transformer test data.
Equation 4.42
Equation 4.43
Equation 4.44
Equation 4.45
Load Profile Report
The SEL-734 provides up to 12 independent load profile recorders. Each load
profile recorder has its own settings and commands, as shown in Table 4.14:
LLQ
losses
I
actual
T
1
• ()
2
LLX• =
9.848=10
3
kVAR•
T
2
1
XFTR
----------------
if MPOS = 3 or 4=
1 otherwise
SLP
losses
I
actual
T
2
• ()
2
SLR• =
9.5= kW
SLQ
losses
I
actual
T
2
• ()
2
SLX• =
26.10= kVAR
LWCU
%LWCU
100
----------------------
MVA•=
LWFE
%LWFE
100
---------------------
MVA•=
%IMAG
LWFE
2
MVA
%LVFE
100
--------------------
⎝⎠
⎛⎞
2
+
MVA
-------------------------------------------------------------------------
100• =
%Z
LWCU
2
MVA
%LVCU
100
---------------------
⎝⎠
⎛⎞
2
+
MVA
----------------------------------------------------------------------------
100• =
Table 4.14 Load Profile Recorder Settings and Commands
Setting/Command First Recorder Second–Twelfth Recorder
Acquisition Rate Setting LDAR LDAR2, LDAR3, ..., LDAR12
Analog Quantity List Setting LDLIST LDLIST2, LDLIST3, ..., LDLIST12
Command LDP LDP2, LDP3, ..., LDP12
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