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Along with the continuous complexity of power system, how to measure the operating data of large substation in real time accurately and safely is a fairly difficult problem. Aimed at such a problem, this paper presents the design and implementation of a novel system for automatic-detection and auto-control based on BIOS-ARM7SEP4020 development board BIOS, chip CC2420 as ZigBee-based RF communication and GPRS technology. Via this system, it is able to calculate the operating data, do the DFT and seize unexpected errors by analyzing changes of the harmonic component or the frequency. This system supports a basic warning device, and can automatically control output signals. Meanwhile, this system has following characteristics: high sensitivity, low cost, wireless communication, visual touch screen operation options, online supervision and intelligent control, thus, this system has a significant applied value in practice.