The sequence of operation for a paralleling switchgear project can be complex. Because no two power systems are exactly the same, each should be custom-designed to meet the requirements and challenges associated with the project application. To reduce guesswork and ambiguity during system design and operation, Kohler Power Systems has developed sequence charts that document how a system will respond to both normal operations and system failures. This intuitive approach helps ensure that the system will operate as designed with no surprises.
A concise, detailed sequence of operation is perhaps the single most important step when designing paralleling switchgear (or any system capable of automatic operation). A traditional narrative-based sequence of operation may not clearly illustrate the timing of events or combine normal operation with how the system responds to failure. Kohler’s unique chart-based sequence of operation offers a number of benefits including step-by-step explanation of sequence, timing and response to failure. These multipurpose charts can also be used for submittal reviews, test procedures, and operation and maintenance manuals. They provide a single point of reference when seeking to understand the operation of the paralleling switchgear.
This article describes the sequence chart approach, how a chart is custom-created for an individual system and its benefits in the design, testing and training processes.