Cylindrical rotor inter-turn short-circuit detection by Kobus Stols, Eskom A “strayflux probe” is commonly used in the industry to determine if any inter-turn short-circuits are present in the field winding of a synchronous generator with a cylindrical...
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Cylindrical rotor inter-turn short-circuit detection by Kobus Stols, Eskom A “strayflux probe” is commonly used in the industry to determine if any inter-turn short-circuits are present in the field winding of a synchronous generator with a cylindrical rotor. The voltage signal obtained from the The most common distances vary between probe is analysed and differences are 1 and 3 cm. The coils typically have typically expressed as a “ percentage between 700 and 800 turns of copper error ”.It is the purpose of this paper to: wire with a diameter of approximately 0,05 mm. The coil is normally obtained Highlight the pitfalls when analysing a by winding the wire on a former with a strayflux recording diameter of less than 10 mm. To provide a tripping philosophy. The orientation of the coil with respect to Flux in the generator the rotor body determines its designation. “Open-circuit” flux It is therefore possible to have a “tangential probe” (Fig. 4) as well as a “radial probe”. Fig.1 i
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