The Research Of Preventing Power Theft Technique In There-Phase Power Measurement System

In our country, power theft becomes more and more seriously in some enterprise. How to perfect the technology of preventing power theft to restrict this deed is a problem which most of power supply corporations are caring in a long time. To resolve this problem, this dissertation author researches deeply and makes two preventing power theft devices which be used in three-phase power supply system including three-phase three-line system and three-phase three-line system. Theories analyzing and tests show that the devices not only can do credible and quick judgment, but also have particular record to every time of stealing power energy.At first, the dissertation author analyzes the measure method characteristic of three-phase three-line system and three-phase three-line system by power measure principle, and analyzes all kinds of power theft way, then concluding them to five styles: voltage style, current style, change phase style, enlarge error style, shunt style. How to calculate the loss energy exactly after acknowledging the deed of power theft is one of problems that the author tries to solve. At last, adding the preventing power theft technology into the existing electric power network is a good way to prevent power theft more effectively.The dissertation concludes all kinds of main character in the state of power theft through these stealing power means, puts forwards all kinds of countermeasure against power theft, at the same time, calculates the loss electric energy. The author develops two kinds of devices for the big power clients. This devices use Microchip high performance MCU PIC16F877 and other chips including XC9572, PCF8583, 6264 etc. This dissertation simulates function circuits to verify design. The software of this device is designed according to module. First it drafts the main block flow chart, then programs subroutine to reach the aim of detecting power theft. This devices' debugging results in lab and the production applied on-site by NeiJiang electric power bureau indicate that they can work as we desired and satisfied the design requirements.This dissertation realizes the development of preventing power theft device. At the same time, it makes the advantages of the preventing power theft device in full, connects the existed electrical network platform, and takes up the theory of setting up a preventing power theft system with network. This dissertation gives the suggestions of preventingpower theft that contains two ways, one is strict management, and another is adopting new technology. In a word, the device should have a bright market selling and applied value; the dissertation has a good value of theory and project applying.