Induction and synchronous motors draw starting current that is considerably more than nominal current. This can cause voltage sags that exceed permissible levels as determined by supply agreements, cause problems for equipment in the remainder of the plant, and in worst cases cause the motor to stall. Optimised Network Equipment can provide a solution based on rugged thyristor switched capacitor banks that has lower cost compared to other remedies such as variable speed drives, provides near full torque during starting and is very simple to install indoors or outdoors in a switchyard.
This example delivered by GE Grid Solutions to the Colonial Pipeline Company describes the typical problem, alternative remedies and a comparison of advantages and disadvantages for each. Refer to our downloads section for product information.
We can provide support in terms of dynamic system models that will identify potential starting voltage sages, quantify the problem and the details of the required solution. Please contact us for more information.