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參數(shù)資料
| 型號(hào)： | SA2005 |
| 廠商： | SAMES |
| 元件分類： | 電能質(zhì)量分析儀 |
| 英文描述： | Three Phase Bidirectional Power/Energy Metering IC with Instantaneous Pulse Output |
| 中文描述： | 三相雙向功率/電能計(jì)量IC瞬時(shí)脈沖輸出 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大小： | 107K |
| 代理商： | SA2005 |
sames
SA2005F
6/10
http://www.sames.co.za
In figure 5, the components required for the three phase application uses current transformers for current sensing. The precision better than Class 1.integrated circuit are the current sense resistors, the voltage BIAS RESISTORW,
voltage inputs of the device.The voltage drop across the CT termination resistor at rated phase shift and a ratio of 1:2500.The CT is terminated with a W resistor giving a voltage drop across the termination
CURRENT SENSE RESISTORScurrent sense inputs of phase one of the device. The resistor inputs at rated conditions.section:L= 80A /2500 / 16μA x 2.7W
/ 2
WVOLTAGE DIVIDER
The voltage divider is calculated for a voltage drop of 14V.
Equations for the voltage divider in figure 5 are:
RA = R16 + R19 + R22
RB = R8 || (R13+P1)
Combining the two equations gives:
( RA + RB ) / 230V = RB / 14V
A 5k trimpot is used in each of voltage channel for meter
calibration. The center position of the pot is used in the
calculations. P1 = 2.5k and values for resistors R13 = 22k and
R8 =1M is chosen.
Substituting the values result in:
RB = 23.9k
RA = RB x (230V / 14V - 1)
RA = 368.9k.
Resistor values of R16, R19 and R22 is chosen to be 120k,
120k and 130k.
The three voltage channels are identical so R14= R15= R16 =
R17 = R18 = R19 and R20 = R21= R22.