中文摘要：

为了确定基于弹性分组环（resilientpacketring，RPR）的变电站通信系统实时性是否满足IEC61850标准的要求，使用网络演算理论推导出各种业务在采用双缓存媒体控制（mediumaccesscontrol，MAC）策略的弹性分组环中传输时延上界的计算方法，并以典型变电站为例，计算得到了变电站内各种数据流的传输时延上界。计算结果为：使用吉比特弹性分组环作为过程总线，当网络负载率小于80％且节点数达到上限时，实时业务的传输时延上界小于2．5ms；使用吉比特弹性分组环既作为变电站总线又作为过程总线，当最大报文长度和网络节点数达到上限时，实时业务的传输时延上界为3．5ms左右。网络演算和OPNET仿真结果表明：基于弹性分组环的变电站通信系统能够满足IEC61850标准的要求。

英文摘要：

In order to confirm whether the real-time performance of substation communication network based on resilient packet ring （RPR） can meet the requirement of IEC 61850, a delay supremum calculus method of various services inside RPR with dual transit queue media access control （MAC） was derived, based on network calculus. A typical substation case was calculated using this method. When RPR is used as process bus, delay supremum of real-time service in RPR network with maximum nodes is below 2.5 ms if the load-rate is below 80%. When RPR is applied as both process bus and substation bus, delay supremum of real-time service in RPR with maximum nodes is about 3.5 ms if the largest packet length reached the upper limit. The calculus and OPNET simulation results indicate that the real-time performance of the substation network based on RPR can meet the real-time application requirement of IEC 61850.