Starting Motors on Generator Sets
This Benshaw white paper explores how different motor starting methods impact generator performance and reliability. It examines electrical and mechanical effects, compares common starting technologies, and explains why properly engineered soft starters typically offer the best performance, efficiency, and protection for generator applications.
Key Points
- Motor Starting Impact: Motor starting draws high current that can significantly affect generator voltage, frequency, and engine loading.
- Comparison of Starter Types: The paper compares DOL, wye-delta, primary resistance, auto-transformer, VFD, and soft starter methods.
- Generator Sizing Considerations: Correct sizing of both the alternator and engine is essential to handle starting loads without oversizing.
- Application Engineering: Successful installations require coordinated design between motor, starter, and generator characteristics.
- Voltage and Frequency Stability: Proper starting methods prevent voltage dips and frequency variations that can destabilize generator operation.
- Soft Starters as Ideal Solution: Soft starters minimize inrush current, provide gradual load application, and improve power stability.
- VFD Limitations: While VFDs control speed and reduce current, their harmonics can degrade power quality and overheat generators.
- Manufacturer Support: Benshaw offers guidance and tools to assist in selecting and engineering the optimal starting solution.