This paper proposes a new principle for generator turn-to-turn fault protection based on the ampere-turn balance between the stator negative-sequence current and the double-frequency component of the field current. The paper describes two protection elements using this principle: a stator-rotor current unbalance element that uses the current magnitudes and a stator-rotor current differential element that uses the current phasors. The paper derives the new methods, discusses their dependability, sensitivity, and security, and illustrates their operation with computer simulations and test results from a
physical made-to-scale generator.
B. Kasztenny, N. Fischer, D. Taylor, In Proc. 13th International Conference on Development in Power System Protection 2016 (DPSP), Edinburgh, UK
KEYWORDS: Generator protection, differential protection, generator stator faults, generator rotor faults, generator turn-to-turn faults