On-line monitoring of rotor shorted turns

• Published in: International Conference on Life Management of Power Plants pp. 55 - 60
• Main Author: Jenkins, M.P
• Format: Conference Proceeding
• Language: English
• Published: London IEE 1994
• Subjects: a.c. machines; Computerised instrumentation; Dielectric materials and properties; Gas-turbine power stations and plants; Insulation and insulating coatings; Power engineering computing; Steam power stations and plants; insulation testing; microcomputers; rotors; automatic test equipment; rotor shorted turns; steam turbines; gas turbines; microcomputer applications; electric breakdown; mechanical stress; turbine-generators; short circuits; operating experiences; monitoring; power engineering computing; insulation; automatic testing; electrical stress; machine testing; computerised monitoring; turbogenerators; machine insulation
• ISBN: 085296627X; 9780852966273
• DOI: 10.1049/cp:19941094

Large generators for use with steam and gas turbines are subject to high mechanical and electrical stress which may lead to deterioration of the insulation. The rotors, in particular, may develop short circuits and there is a need for the operators to be aware of this situation. The manner in which shorted turns can occur in the rotors of generators and the difficulties associated with monitoring for such shorted turns are indicated. An online monitor which has been developed to solve this problem is described together with some operating experiences which have been learnt from the use of it.