The Implementation and Applications of Low Voltage Distribution Line Theft Supervisory System

In this paper, microprocessor in association with GPRS, ZigBee, PLC (Power Line Carrier) and voltage current acquisition circuit were adopted to prepare wireless cable theft detection module with detection capability of conductive cable theft for distributed low voltage circuit including overhead line and underground cable. The greatest feature of this module was its capability to monitor simultaneously electricity-carrying cable and non-electricity-carrying cable, for the electricity-carrying conductor, voltage current acquisition circuit monitoring method was mainly used to be associated with ZigBee wireless communication, and the non-electricity-carrying conductors such as grounding line and neutral line were mainly monitored by PLC, if the communication failed, it could be judged as abnormal, and this can be used as multiple way of confirmation to avoid wrong reporting. Meanwhile, the line status can be sent back to control center through GPRS, and the conducting cable status can be displayed on the human machine interface. If there was any abnormity, a short message and mail will be sent to assigned personnel, meanwhile, the full-time camera in the road side will be used together, when the alarm occurred, the server host will search out the closed-circuit TV (CCTV) image in time to be provided to the police as favorable evidence to enhance the successful rate of cases.