Mihail
Коллеги, добрый день! Возник вопрос у проектировщиков, сколько терминалов РЗА можно включить в кольцо HSR? Если кто-то сталкивался, то что говорят производители и реальный опыт?
Точной цифры я не знаю и не уверен, что она есть. В 90-4 есть такие тезисы на эту тему:
The number of nodes per ring is limited by the cumulative latency introduced by the bridging nodes, the maximum being defined by the application.
For instance, if every node introduces a worst-case forwarding delay of 123 s (maximum length frame in transit at 100 Mbit/s), putting 50 nodes in series results in a worst case delay of 6,159 ms, which is acceptable only for devices complying with transfer time class TT4 or lower (see 11.1.3 of IEC 61850-5:2013).
Since each node introduces a forwarding delay from port to port, the number of nodes per ring should be kept small.
In medium voltage substations, one IED can combine the protection, measurement and control functions usually found in several devices in high-voltage substations, thus reducing the number of devices in the ring.