Abstract
With the development of wireless communication technology and computer technology, more and more smart technologies have been applied in electricity distribution networks. This paper presents an adaptive current differential protection and fast auto-closing system for application in 10 kV distribution networks in China Southern Power Grid. The current differential protection can adaptively change its settings according to the topology change of the primary distribution networks, thus the system effectively reduces the operation and maintenance cost of the power distribution network. In order to restore the power supply for the healthy part of the 10 kV networks quickly after a power system fault is cleared, the protection and control system provides wide area control function for automatic fault isolation and automatic switching. The traditional overcurrent protection and control system have no fault location function, it may take several minutes or even hours to manually locate a fault and then restore the power supply. Compared with the protection and control system of the traditional 10 kV distribution networks, the system developed can locate and isolate faults within 900 ms (assuming that the operating time of the load switch is 700 ms), and can quickly restore power supply in less than one second after a power system fault is cleared.
Highlights
Most protection installed in China 10 kV distribution networks is mainly based on the simple three stage overcurrent protection
As more and more distributed new energy sources are connected to the distribution networks, the conventional radial distribution network is becoming an active distribution network
Current differential protection has been considered for application in distribution networks with distributed generations [5,6,7,8,9]
Summary
Most protection installed in China 10 kV distribution networks is mainly based on the simple three stage overcurrent protection. To solve the problem existed in the voltage–time feeder automation that the fault processing time is long, the upstream switches of the fault point need to tolerate fault current twice, and the upstream sections need to experience two short-time power outages, [14] proposed a quick fault location and isolation method for distribution network based on adaptive reclosure. None of these methods can really provide a fast, sensitive fault location function. Acafntebrethiseoflaauteltdisquisioclkaltye.dA, tfhteeratuhteof-aswulittcishiisnoglafutendc,titohne ianutthoe-sDwMitcShcianng qfuuniccktiloynreinstothree tDhMe pSocwanerqsuuipckpllyy rtoestthoerehtehaeltphoywpearrtsoufp1p0lykVtofteheedhereainlthleysspathrtanofo1n0eksVecfoenedd.er in less than one second
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