智能变电站继电保护跳闸实现方式研究

Research on Relay Protection Tripping Modes in Smart Substation

智能变电站保护跳闸方式主要有2种:一种是保护点对点跳闸;另一种是保护网跳闸。2种方式各有特点:点对点跳闸传输不依赖于网络,但光口多、熔点多;而保护网跳闸需经过交换机,光纤熔接点少、光纤敷设量少。对于采用何种跳闸方式,目前存在较大争议。概述点对点跳闸方式的特点;从抗电磁干扰、抑制网络风暴及交换机高负载处理能力等方面分析保护网跳闸的可靠性;通过对IEC 61850标准报文传输延时进行理论分析,论证保护网跳闸的实时性。对国网公司某试点智能变电站进行的测试结果表明,保护网跳闸时延小于点对点跳闸时延,满足继电保护速动性的要求。

There are two modes of protection tripping in smart substation,including point-to-point tripping and network tripping.These two modes of protection tripping have different features: the point-to-point tripping transmission does not depend on the network,but has more light ports and melting points;the network tripping is realized through switches and has less light ports and melting points.Different views exist on which tripping modes should be adopted.An overview of the point-to-point-tripping mode features are provided in the paper.The reliability of the network-tripping is analyzed in terms of anti-electromagnetic-interference,inhibiting network storm and the high load processing capability of switches.A theoretic analysis is made on the message transmission delay of the standard IEC 61850 and the real-time nature of the network tripping is demonstrated.A testing of an experimental substation shows that the network delay is smaller than the point-to-point delay and meets the speediness requirements of relay protection tripping.