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。

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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。

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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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