Relay protection devices based on sampling and tripping over shared networks, including the switch tree network and high-availability seamless redundancy ring network, have been widely used in smart substations. These networks all have uncertainties in the relay operation system, such as data congestion, delays, errors, and storms, etc., leading errors to sampled value (SV) in digital protection. Therefore, the effective delay measurement and evaluation method over shared networks are important for the reliable relay operation. Based on the principle and implementation of SV propagation delay measurement in shared network, a novel evaluation method of propagation delay measurement is proposed in this article. With this method, the credibility of the delay measurement could be evaluated and the threshold of delay could be adjusted flexibly in engineering. The credibility indicator and engineering threshold method could mitigate spurious tripping and improve the reliable operation in the protection system.

中文翻译：

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基于HSR网络的SV传播时延测量与评估


基于共享网络采样跳闸的继电保护装置，包括开关树网络和高可用性无缝冗余环网，已在智能变电站中得到广泛应用。这些网络在中继运行系统中都存在数据拥塞、延迟、错误、风暴等不确定性，导致数字保护中的采样值(SV)出现错误。因此，共享网络上有效的时延测量和评估方法对于中继的可靠运行具有重要意义。基于共享网络中SV传播时延测量的原理和实现，本文提出了一种新的传播时延测量评估方法。该方法可以评估时延测量的可信度，并在工程中灵活调整时延阈值。可信度指标和工程阈值方法可以减少误跳闸，提高保护系统的可靠运行。