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The power system simulation system described in this paper provides a relay under evaluation with current and voltage inputs similar to those that it would encounter under service and fault conditions. Using digital transient simulation programmes to model power system behaviour, the facility provides an effective bandwidth of from dc to 4 kHz for both the current and voltage relay inputs. The relay's outputs are automatically monitored during the test, enabling a detailed report of its response to be produced. The application of the system is illustrated by the evaluation of a new EHV Teed feeder relaying system.

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