Research Of An Intelligent Feeder Terminal Unit Integrated With Measurement And Control Functions

With the rapid development of Distribution Automation, customers' requirements on the quality and reliability of electrical power supply grow higher and higher. Feeder Automation is one of the most important contents of Distribution Automation. It is of critical importance to decreasing wastage, saving energy and improving the quality and reliability of power supply. The Feeder Terminal Unit is the basic control unit of Feeder Automation and plays an important role in Distribution Automation as well as Feeder Automation.The research and development of the intelligent Feeder Terminal Units applied in Ring Main Unit and switch on the pole. Based on the research of feeder switch characters, some typical modes of fault handling are analyzed and amended. The reliability of power supply is improved by these methods. Ring Main Unit is used more and more in the process of distribution alteration these days, but the functions of control devices applied in Ring Main Unit are simple. Besides this, those devices have low adaptability. For the reason above, the idea and design of a novel intelligent electric device are presented in this thesis. The functions of control, measurement, protection and power quality analysis used in the whole distribution node such as Ring Main Unit, switch station and box-type transformer substation are integrated in this device that has concentrative structure in order to meet the requirement of Distribution Automation. In order to improve the adaptability and expansibility of RMU device, intelligent connection, modularized calculation and time-sequence logic control are researched. The power quality analysis are concerned in RMU device based on the powerful calculation of DSP, because it is important to power supply department and users now. RMU device has a reliable hardware platform because Floating DSP, CPLD, etc are applied in the mainboard of RMU device, and a lot of methods of anti-jamming are adopted in it. The function such as sampling, calculation, and logic control are realized based on the technique of digital signal process, database and oriented object. The device has passed the dynamic simulation test and the prospectived technical goals have been achieved. RMU devices are applied in some box-type transformer substations. In addition, some special requirements such as atrocious environment resisting, operation source and communication are concerned in the design of a FTU device. The design and development of mainboard, operation source and its monitor are presented in this paper.