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Adaptive Transmission Line Protection

The requirements for improvement in the performance of protection relays under different system conditions lead to the implementation of adaptive protection that adjusts to changes in the configuration of the electric power system. This is especially important in the cases of double circuit transmission lines or lines that have one or more segments in parallel with one or more transmission lines on the same or on different voltage levels. Changes in the state of any of the parallel lines or the system around them may affect differently the operation of the line protection relays for faults on the protected line or even on some of the parallel lines. The protection system needs to be able to adapt to changes in the system configuration. This requires first of all the availability of a CIM model of the system including detailed information of the mutual coupling between the protected line and any other parallel line in its neighborhood. Information on each substation configuration, as well as the windings and grounding of the transformers is also required. Information on the grounding status of a parallel line out of service is also required. Then, based on the state of the switching devices received through IEC 61850 locally and switching and grounding of transmission lines or other changes in the system configuration received from the system level, the adaptive protection system will change settings or setting groups in one or more relays to adapt to the system or substation changes. This use case follows from the zone of protection definition through the analysis of the different possible modes of operation. The objective is to stress the 61850/CIM interface to discover aspects of the 「seams」 which exist between these two standards. The CIM and 61850 must both be used at least at both ends of the process for this use case to be of practical use.

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