Investigation of bearing current in a gas turbine generator due to static excitation system

• Main Authors: Ahmed M.S., Mahdi H.F.
• Other Authors: 57189239738
• Format: Conference paper
• Published: Institute of Electrical and Electronics Engineers Inc. 2023
• Subjects: Bearing current; Breakdown voltage; Electrical discharge machining (EDM); Shaft voltage; Static excitation system; Electric breakdown; Electric discharge machining; Electric discharges; Gas turbines; Power plants; Static electricity; Turbogenerators; Bearing currents; Electrical discharge machining; Excitation winding; Shaft-bearing system; Simulation model; Static excitation; Electric grounding
• Institution: Universiti Tenaga Nasional

Shaft voltage and bearing current have become a serious problem in large power plants, the investigation of shaft voltage and bearing current in rotating machines have generated much attention in the field of electrical engineering. In this paper we present an investigation of bearing current phenomena through the use of a simulation model of excitation winding and shaft-bearing system for a 96.3 MW gas turbine generator at a power plant. Simulation results obtained shows that bearing current is produced at the exciter end and turbine end of the generator due to the static excitation voltage. A solution to mitigate the bearing current by using grounding brushes is proposed. � 2013 IEEE.