Category Archives for Videos
Understanding Permissive Over-Reaching Transfer Trip (POTT) Communication Assisted Trip Schemes Video
Here is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the
Continue readingUnderstanding Permissive Under-Reaching Transfer Trip (PUTT) Communication Assisted Trip Schemes Video
Here is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the
Continue readingFrequency Response and the Power System
Here’s an excellent video on frequency response in the grid from NERC. I often tell my students that renewables are making the power system less stable and this video explains part of the issue....
Continue readingDirect Transfer Trip and Direct Under-Reaching Transfer Trip Schemes Video
We’re continuing our end-to-end testing series by looking at the two simplest communication-assisted trip schemes used. Watch this Direct Transfer Trip and Direct Under-Reaching Transfer Trip
Continue readingDrawing Phasor Diagrams for Relay Testers
Waveform diagrams contain every detail of an electrical system, but that information can be difficult to understand without a lot of effort. Phasor drawings take the complex information embedded in waveform
Continue readingUnderstanding Distance Protection (21) Video
The last video in our end-to-end testing series gave you a general overview of distance protection, and why we use it in modern electrical systems. It is important to know how a regular distance protection
Continue readingA New Transmission Line Protection (21) Video
End-to-End Testing can appear to be a daunting task. However, any relay tester can perform successful End-to-End Tests with a basic understanding of transmission line protection (or 21 impedance protection)
Continue readingWhy did my Frequency Test in Cycles Fail?
We added a new YouTube video, Why did my Frequency Test in Cycles Fail?. This video describes how two different relays with identical settings can have different time test results when performing any frequency
Continue readingUnderstanding Microprocessor Relay Logic – Microprocessor Relay Testing Plans
We have uploaded our fourth YouTube video, Understanding Microprocessor Relay Logic – Microprocessor Relay Testing Plans. (http://youtu.be/ijdSKozctNo) This video discusses how
Continue readingUnderstanding Microprocessor Relay Logic – Relay Digital Logic Schemes
We have uploaded our third YouTube video, Understanding Microprocessor Relay Logic – Relay Digital Logic Schemes. (http://youtu.be/do3EkEcb0eM) This video discusses the different relay
Continue readingUnderstanding Microprocessor Relay Logic – Basic Digital Logic
We have uploaded our second YouTube video, Understanding Microprocessor Relay Logic – Basic Digital Logic. (http://youtu.be/DEN-ZEtEZ5c) This video discusses how you can convert the digital
Continue readingUnderstanding Microprocessor Relay Logic – A Brief History of Relays
We have uploaded our first YouTube video, Understanding Microprocessor Relay Logic – A Brief History of Relays. (http://youtu.be/q_E_Gv_9_LQ) This video talks about the history of microprocessor
Continue readingGood Video for CT / PT / Phasor Diagram / Transformer Connections
Here is another excellent, but dated, video that covers a lot more than its title. It starts with an excellent introduction to CTs and PTs (http://youtu.be/T5U5M3RYx9Q) Then some Phasor Diagram basics
Continue readingGood Video Describing Electrical Fault Calculations
Understanding how to perform electrical fault calculations is not necessary if your primary goal is to simply test relays. However, if you want to truly understand the electrical systems, how
Continue readingA Good Instrument Transformers Video
Instrument transformers are specially designed to transform high system voltages and currents into smaller voltages and currents for remote metering and protection. Instrument transformers can be
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