King Jonah Electrical Engineering

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High-speed protection against phase and earth faults can be provided by distance relays located at the end of the feeder remote from the transformer.
The transformer constitutes an appreciable lumped impedance. It is therefore possible to set a distance relay zone to cover the whole feeder and reach part way into the transformer impedance.

The purpose of this thesis was to get to know the theory behind instrument transformers in substations and to create a calculation template in Microsoft Excel which would simplify the current transformer calculation process.
The way of implementing different calculations to be print ready to customers was to make several sheets for different protection functions. The basic instrument transformer theory is covered in the first segment followed by basic relay protection functions.