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How circuit breaker trip unit works?

In addition to providing a means to open and close its contacts manually, a circuit breaker must automatically open its contacts when an overcurrent condition is sensed. The trip unit… Read more

Mar 10, 2011 | Edvard

How circuit breaker trip unit works?

Calculating lightning strike distance

Return stroke current magnitude and strike distance (length of the last stepped leader) are interrelated. A number of equations have been proposed for determining the striking distance. The principal ones… Read more

Mar 09, 2011 | Edvard

Calculating lightning strike distance

Early years of Nikola Tesla

Nikola Tesla was born “at the stroke of midnight” with lightning striking during a summer storm. He was born in Croatia in the Austro-Hungarian Empire. The midwife commented, “He’ll be… Read more

Mar 05, 2011 | Edvard

Nikola Tesla - Early Years

Protection Relay – ANSI Standards

In the design of electrical power systems, the ANSI Standard Device Numbers denote what features a protective device supports (such as a relay or circuit breaker). These types of devices… Read more

Feb 22, 2011 | Edvard

ANSI codes for protection relays

AC Vs. DC

What’s this thing about AC anyway? A little history lesson might be in order. It all started when Edison built the first incandescent bulb and the power station to light… Read more

Feb 08, 2011 | Edvard

AC vs. DC

Electrically Held Contactors – Siemens

Most lighting and heating applications require a contactor to control the loads. One type of contactor is an electrically held contactor, which is similar to a magnetic starter. Unlike a… Read more

Feb 05, 2011 | Edvard

Electrically Held Contactors - Siemens type CLM
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