“Why did my 40-Element test fail?” is probably the most common question I get asked about generator protection. The first question I ask is, “What kind of fault are you trying to simulate?” The second question is, “Where are the test currents in relation to their voltages?” If you truly
I once watched two engineers/technicians argue for two hours about what power definitions should be displayed on a HMI interface. One of them argued that VARs were being EXPORTED during lagging conditions, so a lagging current should be shown as POSITIVE VARS and Power Factor! The other argued that VARs
I presented a “Testing Breaker Failure Schemes” paper at the 36th annual Hands-On Relay School in 2019. This post is the second part of the paper that will give step-by-step test plans to help you test Breaker Failure Schemes. I highly recommend you read: Part 1 of the series first
I presented a “Testing Breaker Failure Schemes” paper at the 36th annual Hands-On Relay School in 2019. Here’s the first part of the paper that will give you a basic introduction to Breaker Failure Schemes: 1. Introduction The power system is a delicate balance between load and generation. We usually
I’ll be presenting the “Testing breaker Failure Schemes” open lecture at the 36th Annual Hands-On Relay School this year. I haven’t written anything about Breaker Failure protection before and here’s the synopsis for the paper: “Relay testers who want to test breaker failure (50BF) schemes should understand how 50BF schemes
Usually I try to keep my posts as simple and practical as possible. This post is a little different because I will discuss how I approach all relay testing. Skip this one if you are looking for relay testing steps for a specific element, or skip ahead to the “How
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