High Z Generator Diff Protection
High Z Generator Diff Protection
(OP)
I am contemplating using high-z diff protection for a 660MW generator. Using biased diff requires enormous CT's due to the very high fault levels. High-z diff require the Ek to be a minimum of twice the stability voltage settings which is much lower than the Ek required for biased diff. The 23kV generator is connected to a 330kV grid. Has anyone applied high z to a gen and if so anything to look out for? Relays used?
Thanks.
Thanks.





