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Category Archives for Electrical Basics

Ask Chris: What is the difference between contactors, motor starters, relays and circuit breakers?

A reader submitted a question through the Ask Chris form. I’ve expanded the original question from “what are the differences between relays, contactors and motor starters?” to “What

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Which is the Killer, Current or Voltage?

A friend forwarded me this video because it relates to electricity. It made me laugh. Don’t try this at home. Is it the current or voltage that kills?

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Why 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

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Understanding 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

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Good 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

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A Good Resource for Electrical Theory Basics

All high voltage electrical testers should understand the basics of electrical theory. Unfortunately, Many people in the high voltage electrical testing industry fall into testing by accident and never

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Good 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 relays

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Understanding Transformer Vector Groups

Transformer vector groups can be a difficult concept to understand. I was lucky because the transformer ratio test-set I used for the first couple of years in my career allowed me to make three-phase connections,

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Distance or Impedance Protection (21) Video

Line distance (21) protection is primarily used to protect transmission lines or other electrical equipment where the equipment’s impedance characteristic can be calculated or modeled with software

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Good Videos to Help Understand Protective Relays

I’m reviewing information for the next book in The Relay Testing Handbook series and came across this Youtube channel. This is a dated, but excellent, video introduction to overcurrent protection (50/51)

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