Innovation to reality - introducing state-of-the-art protection and monitoring to existing low-voltage switchgear

A large array of components with communications capabilities exists for constructing protection, monitoring, and control systems for power distribution equipment (switchgear). While most of these components or devices perform multiple functions, a typical application will contain at least several different devices that must be interconnected to function as a complete system. An example might be multifunction meters coupled with multifunction protective relays, and a programmable logic controller for a complete system. Could it be possible to take the functions of multiple microprocessor-based devices and combine those functions into a single-processor system? Would the new system be able to execute instructions for fast acting overcurrent protection while gathering simultaneous metering data from every circuit breaker in the equipment line-up? In this paper, the authors discuss a unique approach to low-voltage switchgear protection and the process of transitioning this concept to a realworld application. The paper describes the architecture and functionality of this approach and explains how a centrally controlled system can provide advanced monitoring and protection functions much more effectively than existing systems. Installation and field-testing are important steps in the process of introducing new technology. This paper will describe why retrofitting an existing switchgear lineup may be preferable to starting with new switchgear. It will also describe the considerable planning involved in the retrofit process to minimize the effect on the customer´s operations. The paper concludes with a discussion of how well the system functioned in an actual operating environment.