Speaker: John Lane, Doble Engineering Company
Relay testing can be fairly routine until things don’t go as planned. Whether you are performing testing during a plant shutdown and run through many relays in a short period of time or you are commissioning a new facility, routine testing can become un-routine very quickly. You may also be called out to troubleshoot a mis-operation. There is nothing routine about this type of test.
What steps do you take when things don’t go right? Having a depth of power systems protection and testing knowledge will be invaluable in determining root cause in this situation. We will look at techniques and procedures that will be helpful whether you are performing a routine test or commissioning a new facility. Power system fundamentals like symmetrical components and various types of protection like transformer, line, and buss protection will be discussed. The relay technician should have a very good understanding of protection and control schematics as well as interpreting event reports as they are invaluable to determine root cause and corrective action. Also, proper testing techniques involves setting up the test set properly.