Scheme Research Of Intelligent Ring Main Unit

With the fast development of intelligent distribution network at present,as the equipment of urban distribution network,Ring Main Unit is becoming more and more important but the level of RMU is far from intelligent.Although some of RMU are preliminary realize the function of feeder automation,but they do not have on-line monitoring function.It is s a huge hinder for RMU jump in intelligent distribution network for most of them don't have automation function,so the research on intelligent RMU is in urgent need.Based on the centralized and distributed RMU,this paper has put forward a set of intelligent RMU and has practical significance.First of all,this paper presents a set of feeder automation and online monitoring of intelligent RMU system solutions.For automation subsystem in centralized RMU on the backup power supply,power distribution terminal and overall architecture of defects is put forward a centralized intelligent RMU;In order to make up for the centralized intelligent RMU scalability is not high,this paper proposes a distributed intelligence RMU.For RMU of the problems existing in the power distribution terminal,in order to realize the miniaturization and intelligent ideas put forward the centralized and distributed power distribution terminal hardware scheme.Secondly,based on the current RMU online monitoring,put forward a set of practical,more parameters on-line monitoring scheme,can achieve comprehensive monitoring of RMU and electric life evaluation.Electric parameters monitoring mainly monitor the secondary control loop current,closing coil current,indoor cable partial discharge signals,the switch main circuit current and closing coil voltage,etc.Mainly monitor the RMU non-electricity monitoring cable head temperature,switch contact temperature,the temperature of power module,SF6 gas pressure and temperature and humidity in the oven,mechanical vibration signals,the switch contacts movement speed,the RMU accumulative used times of action mechanism and RMU using a number of years.Finally,based on the centralized and intelligent RMU,for example,the intelligent RMU application in a power system,expatiate on process of feeder automation function.The intelligent RMU can improve the power supply reliable obviously,and also have great significance in the intelligent distribution network.