Abstract :
EL CID (electromagnetic core imperfection detector) monitors the condition of large AC rotating machine stator cores. Applications cover turbogenerators, industrial-sized machines and hydrogenerators. The basic principle is that of detection by a Chattock potentiometer of the electromagnetic field set-up by circulating current from inter-laminar insulation defects. The test provides an indication of core insulation faults, remedial work progress, a satisfactory condition before, and after winding, and also on-going service condition (as a guide to the necessity for core renewal). A quantitative analysis of some unusual EL CID results, further confirms the soundness of the EL CID technique
Keywords :
electromagnetic fields; hydroelectric generators; insulation testing; machine insulation; machine testing; magnetic cores; magnetic field measurement; monitoring; stators; turbogenerators; AC rotating machine stator cores; Chattock potentiometer; EL CID tests; circulating current; condition monitoring; core insulation faults; core renewal; electromagnetic core imperfection detector; electromagnetic field effects; hydrogenerators; industrial-sized machines; inter-laminar insulation defects; on-going service condition; remedial work progress; turbogenerators;
