| The distribution network plays an important role in distributing electric energy in power network.The main devices such as power distribution transformer,switch cabinet and cable in the distribution network,are infrastructure directly oriented to the users.The reliability and running condition of these devices directly determine not only the stability and security of the whole system,but also the quality and reliability of electrical power supply.Due to the characteristics such as many nets,long line and wide surface,the condition monitoring of the main devices of the distribution network is complex and difficult.In order to solve the problems,the on-line monitoring technology of the main distribution devices is studied in order to meet the demand of on-line monitoring in this paper.Therefore,the following works are mainly carried out in this paper:Firstly,the key characteristics on-line monitoring technology of distribution transformer,switch cabinet and power cable is studied.Then,a relatively mature condition monitoring technology plan for the two main distribution devices is put forward.Secondly,in order to solve the sensor selection problem in the condition monitoring of main distribution devices,two comprehensive evaluation plans of sensors are put forward,one is facing the demand of the condition detection of main distribution devices and the other is based on improved membership function.At last,the interference sources of different condition monitoring technology are analyzed,then the anti-interference technology of on-line monitoring of main distribution devices is studied.At the same time,in view of the high temperature inside the switch cabinet and the interference of electromagnetic interference to the wireless temperature measurement system,the improved schemes of resisting high temperature and electromagnetic interference are proposed.Through the research in this paper,the current condition monitoring technology of distribution network is effectively understood and grasped.The sensors selection is guided and the distribution network condition monitoring system can be built based on the method proposed in this paper. |
