Starting methods for large synchronous refiner motors

Starting large refiner motors in the paper industry has become a more complex problem due to steadily increasing motor size, and more stringent requirements on power quality in urban areas. Several possible starting methods are presented, and the solution chosen for a project is discussed in detail, showing how the chosen method met the process criteria, while keeping power line disturbances within guidelines of the power utility involved. The advantages and disadvantages of each method are explained, and a relative capital cost is presented. The reader will gain an understanding of the considerations necessary to select an optimum starting method.<>