| Abstract |
This paper presents a novel differential protection
of Powerformer, a type of high-voltage graded insulated
cable wound generator. The false differential current
associated with the distributed capacitance of Powerformer
stator windings is analyzed. Based on the investigation results,
the winding capacitance can be equivalently arranged
on the terminal and neutral of the generator respectively in
a reasonable partition. And the phase voltages at the terminals
are utilized to estimate the capacitive currents,
which can be compensated to improve the sensitivity of the
differential protection. Extensive simulation results prove
that this compensation scheme can improve the reliability
of the current differential protection of Powerformer. |
