Instantaneous overcurrent (50) and time overcurrent (51) protection can protect equipment from overloads and short circuits, but there are situations where their ability to protect a system is limited. Many applications exist where the direction of current is not fixed because of multiple sources and/or parallel feeders. These situations prevent
Testing more complicated elements that use a percentage or ratio between values can be difficult if you cannot properly define all of the values in the equation. It doesn’t help that different people can define the same element using different terms, especially when they don;t define their terms in their
Here is a story from one of our Customers at Manta Test Systems: “I had to troubleshoot a Schweitzer SEL-300G relay yesterday that had the (25) Sync-Check element enabled, but wouldn’t assert the close permissive. My customer had had extreme problems synchronizing the 16MW generator on-line. They sometimes had to
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