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智能变电站建设对通信系统的可靠性提出了更高的要求。本文依照电子产品可靠度的一般分析方法,得出了变电站内单环形网、单星形网和双星形网的可靠度及平均无故障运行时间的计算公式。计算结果表明环形网络结构的可靠度优于星形。为提高变电站通信网络的可靠性,宜选用性能优良的标准工业以太网交换机,尽量减少交换机台数,缩短信息传输距离,合理划分VLAN,并采取有效措施抑制广播风暴。
The construction of smart substation puts forward higher requirements on the reliability of communication system. In this paper, according to the general analysis method of electronic product reliability, the formulas of reliability and MTBF of single ring network, single star network and double star network in substation are obtained. The calculation results show that the reliability of the ring network structure is better than the star shape. In order to improve the reliability of substation communication network, standard industrial Ethernet switches with good performance should be selected to minimize the number of switches, shorten the information transmission distance, divide VLANs reasonably and take effective measures to suppress broadcast storms.