Overview
IEC TS 60034-24:2009 is a technical specification developed by the International Electrotechnical Commission (IEC) that serves as an application guide for the online detection and diagnosis of potential failures in the active parts of rotating electrical machines and the diagnosis of bearing currents. This part of the IEC 60034 series is specifically applicable to multi-phase rotating electrical machines, such as induction and synchronous machines. The focus is on real-time, non-invasive monitoring techniques aimed at detecting critical faults and ensuring optimal operational reliability.
As rotating electrical machines are widely used in industrial applications, their reliability and minimized downtime are essential. While technological improvements have increased machine robustness, early failure detection remains crucial to avoid unplanned stoppages and costly repairs. IEC TS 60034-24:2009 provides practical methods, guidelines, and requirements for the systematic online detection of key electrical and mechanical faults, helping asset managers and engineers improve machine condition monitoring.
Key Topics
Covered Faults
IEC TS 60034-24:2009 addresses the detection and diagnosis of:
- Inter-turn faults - Short circuits between turns in windings
- Phase-to-phase short-circuits - Faults between different winding phases
- Double earth faults and single earth faults (for motors with an earthed star-point)
- Static and dynamic eccentricities - Imbalances between rotor and stator alignment
- Cage imperfections or defects - Including broken bars or end-rings in induction motor rotors
- Bearing currents - Undesired current flow through motor bearings
Diagnostic Techniques
The standard describes several online diagnostic methods, including:
- Monitoring of stator current and voltage for identifying spectral signatures of faults
- Use of auxiliary turns or magnetic sensors embedded into stator slots to sense abnormal magnetic field components
- Application of search coils for field analysis
- Analysis of shaft voltages and bearing currents to pinpoint possible electrical discharges or insulation breakdowns
Exclusions
The standard does not cover:
- Vibration monitoring (covered by ISO 10816 and ISO 7919)
- Detection of partial discharges (covered by IEC 60034-27)
- Core imperfections
- Special methods for niche applications (e.g., turbo generators)
Applications
IEC TS 60034-24:2009 is relevant for a wide range of industrial sectors using multi-phase rotating electrical machines, including:
- Power generation plants
- Manufacturing facilities
- Petrochemical and process industries
- Water and wastewater treatment facilities
Key benefits of applying this standard include:
- Reduced downtime by enabling timely maintenance based on real-time machine condition
- Improved safety by detecting hazardous faults (like bearing currents and winding short circuits) before catastrophic failure occurs
- Lower maintenance costs due to early detection and targeted repairs
- Enhanced machine reliability and longevity by identifying and correcting issues proactively
Implementers such as maintenance engineers, reliability professionals, and OEMs use the guidelines to set up or improve online monitoring systems using appropriate sensors and analysis methods tailored for their rotating machine fleet.
Related Standards
For a comprehensive condition monitoring program, consider these related international standards:
- IEC 60034 Series – General standards for rotating electrical machines
- IEC 60034-27 – Measurement of partial discharges in rotating machines
- ISO 10816 / ISO 7919 – Mechanical vibration evaluation in machines
- IEC 60034-1 – General requirements for rotating electrical machines
These standards complement IEC TS 60034-24:2009 and together provide a robust framework for the effective monitoring, detection, and diagnosis of both electrical and mechanical faults in rotating machines. Adhering to international best practices ensures higher equipment reliability, safety, and operational efficiency.