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THE DESIGN OF HLS VOLTAGE NETWORK MONITORING SYSTEM BASED ON AD7756

The features of a voltage/energy measuring IC AD7756 are introduced in this paper. By using this IC, we designed a voltage network monitoring system for HLS. With the bus interface of RS485, The system can monitor 64 sites simultaneously. Each site module includes 2 ADCs, a voltage reference, a temperature sensor and a relative DSP. It can set the voltage alarm threshold when working, and sample the voltage waveform in real time at the sampling rate as high as 14KSPS. Besides the bus interface of RS485, the common serial interface of RS232 is available too.