Rotor Loss and Temperature Field of Synchronous Condenser under Single-phase Short Circuit Fault Affected by Different Materials of Rotor Slot Wedge

Synchronous Condenser (SC) can provide the dynamic reactive power for the converter station of Ultra High Voltage Direct Current (UHVDC) during the short-circuit fault of the power system. However, the rotor loss and temperature rise restrict the operation of the SC. A key factor that affects the rotor loss distribution and temperature rise is the conductivity of the rotor slot wedges. For a SC with the rotor slot wedges made of aluminum, beryllium bronze and stainless steel, this paper presents the electromagnetic and temperature field calculation of the single-phase short circuit faults and the experimental validation. The influences of different materials of the rotor slot wedges on the rotor loss distribution and temperature rise of the SC are studied. The positions of the highest temperature rise on the rotor are obtained. According to the maximum permissible temperature of rotor, the duration of the single-phase short circuit is obtained under different materials of slot wedge. This study can provide the theoretic basis for improving the operating ability of the SC.