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This paper introduces the detection and analysis for an abnormal corona defect of a 500kV B-class earthing switch using combined detection technique of ultraviolet imaging and non-contact ultrasonic. Combined with ultraviolet detection spectrum, ultrasonic partial discharge spectrum and equipment inspection results of corona defect location, the principle of arc extinguishing system and failure reason is analyzed. The fault is due to poor contact between drain line of arc extinguishing chamber and main contact conductor, which causes Continuous induction discharge around the contact area with earthing switch in open position. Due to early detection and timely treatment of this defect, possible loss is avoided.

At present, the distribution network access network lacks uniform standard, which makes the communication protocols of manufacturers are not compatible with each other, and dues to the different services and scenarios need to adapt to different communication devices and systems. These reasons lead to extremely difficult to manage and maintain the distribution network communication system, which seriously hampered the process of comprehensive information of the power distribution. In this paper, a wireless communication device for distribution network with adaptive multi interface protocol is designed in allusion to the problem of existing technology. This device has a variety of interfaces and protocol adaptive conversion function, which can adapt to the power distribution terminal with a variety of interface types and communication protocols, and it provides a strong support for constructing the unified access specification for the distribution communication network of the multi scene and service.

The Power Line Carrier (PLC) communication makes full use of the power line which has already been laid as the transmission medium, and does not require earthwork construction and communication line laying, which can achieve rapid construction. While, the wireless communication technology provides a good solution to solve the problems of high cost, poor flexibility and difficult installation and maintenance of wired communication technology. In this paper, based on the combination of medium voltage power line broadband carrier communication technology and Low-Power Wide Area Network(LP-WAN), proposes a communication technology of remote power monitoring system combined with wired and wireless, which can achieve real-time communication of power system with low cost and long distance.

With the rapid development of intelligent distribution network technology, “Optical fiber backbone network + low-power wireless communication network” becomes the most reasonable scheme for power system data acquisition. Optical fiber network access port, called “ONU” port, has been set up in the fiber backbone network at different geographical locations. In this situation, interfaces require numerous power parameters to be collected, and the ports around each “ONU” are also different. It leads to the problem that the collected data is not unified, which put forward higher requirements to the transmission method of urban electric power parameter. In this paper, there is a data transmission method based on the monitoring system combined with fiber and wireless communication network in the urban area, which can effectively solve this problem.