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參數(shù)資料
| 型號(hào)： | SA2007HSA |
| 廠商： | SAMES |
| 元件分類： | 電能質(zhì)量分析儀 |
| 英文描述： | Single Phase Bidirectional Dual Element Power/Energy Metering IC with Pulse Output |
| 中文描述： | 單相雙向雙元件的功率/脈沖電能計(jì)量IC輸出 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | SA2007HSA |
The analog (metering) interface shown in figure 8, is designed
for measuring 230V/60A with precision better than Class 1.
The most important external components for the SA2007H
integrated circuit are the current sense resistors, the voltage
sense resistors and the bias setting resistor. The resistors
used in the metering section should be of the same type so
temperature effects are minimized.
Current Input IIN1, IIP1, IIN2, IIP2
Two current transformers are used to measure the current in
the live and neutral phases. The output of the current
transformer is terminated with a low impedance resistor. The
voltage drop across the termination resistor is converted to a
current that is fed to the differential current inputs of the
SA2007H.
CT Termination Resistor
The voltage drop across the CT termination resistor at rated
current should be at least 20mV. The CT’s have low phase shift
and a ratio of 1:2500. The CT’s are terminated with a 3.6
W
resistor giving a voltage drop of 86.4mV across each
termination resistor at rated conditions (I
for the meter).
max
Current Sensor Input Resistors
The resistors R10, R11 and R12, R13 define the current level
into the current sense inputs of the SA2007H. The resistor
values are selected for an input current of 16μA at rated
conditions. For a 60A meter and a CT Ratio of 2500:1 the
resistor values are calculated as follows:
R10 = R11 = ( I/ 16μA ) x R / 2
SH
= 60A / 2500 / 16μA x 3.6
W
/ 2
= 2.7k
W
I
=Line current
L
R = CT Termination resistor
SH
2500 = CT ratio
The two current channels are identical so R10 = R11 = R12 =
R13.
Voltage Input IVP
The voltage input of the SA2007H (IVP) is driven with a current
of 14μA at nominal mains voltage. This voltage input saturates
at approximately 17μA. At a nominal voltage current of 14μA
allows for 20% overdriving. The mains voltage is divided with a
voltage divider to 14V that is fed to the voltage input pins via a
1M
W
resistor.
Voltage Divider
The voltage divider is calculated for a voltage drop of 14V.
Equations for the voltage divider are:
RA = R1 + R2 + R3
RA = R7 || (R5 + P1)
Combining the two equations gives:
(RA + RB) / 230V = RB / 14V
Values for resistors R4 = 10
W
, R5 - 22k
W
and R7 - 1M
W
is
chosen.
Substituting the values result in:
RB = 21.526k
W
RA = RB x (230V / 14V -1)
RA = 332.12k
W
.
Standard resistor values for R1, R2 and R3 are chosen to be
100k
W
, 100k
W
and 120k
W
.
The capacitor C1 is used to compensate for phase shift
between the voltage sense inputs and the current sense inputs
of the device, in cases where CTs with phase errors are used.
The phase shift caused by the CT may be corrected by
inserting a capacitor in the voltage divider circuit. To
compensate for a phase shift of 0.18 degrees the capacitor
value is calculated as follows:
C = 1 / (2 x
p
x Mains frequency x R5 x tan (Phase shift angle))
C = 1 / ( 2 x
p
x 50 x 1M
W
tan (0.18 degrees ))
C = 1.013μF
Reference Voltage Bias resistor
R6 defines all on chip and reference currents. With R6 = 24k
W
optimum conditions are set. Calibration should be done in the
micro controller software.
PRELIMINARY
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