This article introduced take the AD7757 electrical energy measurement chip as the core, designs one kind of survey city electricity active power the intelligent electric meter method.
介绍了以ad7757电能计量芯片为核心，设计一种测量市电有效功率的智能电度表的方法。
Accurate gage of the locomotive power, active and passive, are realized via the intelligent kilowatt-hour meter, making the scientificmanagement of locomotive power possible at the same time.
该系统实现了机车用电（有功、无功）的准确计量，同时为机车用电的科学管理打下了基础。
Measure function: can measure current, voltage, active power, reactive power, frequency, zero sequence current, electric energy, 2 pulse inputs implement watt-hour meter auto read;
测量功能：高精度测量电流电压、P、Q、功率因数、频率、零序电流、计算电度；2路脉冲量输入实现外部电度表自动抄表；
Measure function: can measure current, voltage, active power, reactive power, frequency, zero sequence current, electric energy, 2 pulse inputs implement watt-hour meter auto read;
测量功能：高精度测量电流电压、P、Q、功率因数、频率、零序电流、计算电度；2路脉冲量输入实现外部电度表自动抄表；
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