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STPMC1 датащи(PDF) 29 Page - STMicroelectronics

номер детали STPMC1
подробное описание детали  Programmable poly-phase energy calculator IC
PDF  77 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPMC1 датащи(HTML) 29 Page - STMicroelectronics

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STPMC1
Theory of operation
Doc ID 15728 Rev 6
29/77
Where:
Imax = 2
16
Σ IX = IR + IS + IT + IN
for SYS = 0, 1, 2, 3, 4, 7
Σ IX = IS + IT
for SYS = 5, 6
Bit
BCS is set according to Table 15
with (
Σ iX)RMS = (iR + iS + iT + iN)RMS
Example 5: 3-ph system - BCS = 0
Let us consider a three-phase, four wires system where the RMS values of the current
applied are:
IR = 5 A
IS = 5 A
IT = 4.4 A
IN = 0 A
The sum of all instantaneous currents (iR + iS + iT + iN) should always be zero, unless
there is a tamper condition.
The STPMC1 calculates this sum and put its RMS value divided by four (called sIRMS)
into register DMN (see paragraph
9.17.2).
This value should always be zero (or very close).
In our case:
The currents are shown in
Figure 11 below.
∑ >
256
I
I
max
X
Table 15.
Tamper conditions
BCS
SYS = 0, 1, 2, 3, 4, 7
SYS = 5, 6
0
or
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