Starting motors on generator sets: Selecting the most effective solution
Electric motors play a crucial role in generator operation, often constituting a significant portion of the load. Managing the substantial overloads experienced during motor starting is vital for efficient generator sizing, says distribution giant ACDC Dynamics, adding that selecting the appropriate starting solution is paramount in ensuring optimal performance.
Impact of motor starting on generator sets
When an alternating current (AC) induction motor starts, it draws a high current, often several times its full load current, before stabilising in operation. This initial surge places a considerable demand on the electrical equipment, causing voltage drops and adding to the engine’s workload.
For generator sets, starting motors can significantly impact their overall loading, necessitating careful consideration for efficient and cost-effective solutions.
Selecting the right starting method
Among various starting methods, soft starters emerge as the preferred choice. They offer precise control over start current, gradually applying load to the generator, thereby minimising voltage and frequency disturbances. Soft starters also allow adjustments tailored to individual motor and load characteristics, ensuring optimal performance.
While variable frequency drives (VFDs) limit start current, they introduce voltage and frequency variations that can strain the generator. This limitation makes them less practical for generator applications.
Generator sizing & selection
The generator sizing process involves dynamic and complex interactions between the genset, engine, alternator, and motor starters. Consulting with suppliers or utilising sizing software is crucial to ensure system performance in specific applications. Key criteria for successful motor starting include engine KW size, alternator short-term kVA rating, and continuous kVA rating.
Soft starters offer the best solution for starting motors in generator set applications, providing gradual load application and precise current control. Careful engineering and matching of start requirements with generator capacity are essential for optimal performance. International brand AuCom, distributed locally through ACDC Dynamics, offers expertise in identifying start requirements and engineering solutions tailored to generator applications, ensuring reliable operation.
Enquiries: www.acdc.co.za
