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Rotating machines are capital-intensive assets for utilities and the industry. Safe operation is critical because their failure may lead to huge economical losses, with damage to the asset itself, possible damage to surrounding substation parts, and resulting power outages. Furthermore, defective rotating machines pose lethal threats to utility staff. Utilities move from a time-based to a condition-based maintenance. Therefore, testing and diagnosis is required to assess the condition of the assets, ensure reliability, reduce maintenance costs, and avoid unexpected outages in the power generation, industrial drive application, and traction. OMICRON has designed a wide range of innovative systems for on-line or off-line testing of rotating machinery according to international standards.
Partial discharge (PD) measurement and monitoring
Partial discharges (PD) occur in the stator insulation system of rotating machines, where local electric field stress exceeds the local electrical strength. The insulation materials typically used for rotating machines are resistant to a certain level of PD. Consequently, a large quantity of PD pulses might be expected in all phases under normal operating conditions. However, certain PD may indicate defects in the insulation, or damage off the winding structure.