What question did this study set out to answer?

This paper aims to explore the mechanisms behind shaft voltage generation and its implications for turbomachine reliability.

June 3, 2026International Journal of Scientific Development and Research0 citationsOpen Access

Shaft Voltage and Current Phenomena in Turbogenerators: Case Study of Post-Overhauling Bearing Anomaly at a 210 MW KWU Turbine Set

SMShobhan Kumar MalanaBharat Heavy Electricals (India)

Key Points

This paper aims to explore the mechanisms behind shaft voltage generation and its implications for turbomachine reliability.
Conducted a case study on a 210 MW KWU-design turbine after overhaul.
Correlated various electromagnetic, capacitive, magnetic, and electrostatic sources with field observations.
Proposed a framework of tiered operational thresholds to monitor conditions.
Identified that voltages over specific levels, coupled with leakage currents, are critical indicators for condition-monitoring.
Demonstrated that managing these voltage and current phenomena can prevent catastrophic failures in turbogenrators.

Abstract

Shaft voltage and bearing currents represent critical reliability challenges for large-scale gubernators. Left unmanaged, these phenomena accelerate bearing degradation, trigger unplanned outages, and compromise machine longevity. This paper investigates the physical mechanisms of shaft voltage generation through a detailed case study of a 210 MW KWU-design turbine following a scheduled overhaul. By correlating electromagnetic, capacitive, magnetic, and electrostatic sources with field observations, this study proposes a robust framework of tiered operational thresholds. Findings indicate that voltages exceeding specific levels, when paired with leakage currents, serve as vital condition-monitoring indicators to prevent catastrophic failure

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