Archive for the ‘Electrical Safety’ Category

The Importance of Insulation Testing

February 8th, 2019 | Make a comment | Posted in Electrical Safety
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Insulation Testing Equipment material

 

An insulating material is a material that responds with very high resistance to the flow of electricity through it. An electrical insulation is composed of a mix of materials – like PVC, glass, resin, varnish, ceramic, fiberglass, etc. –  whose purpose is to prevent electric current from flowing where it’s not wanted.

Read your colleague Ginnie’s tips on insulation testing below!

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Coordination of Protections in a Power System

February 1st, 2019 | Make a comment | Posted in Electrical Safety
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The coordination of protections is a study of the interfaces between the protection scheme and the system overcurrent, considering an operation sequence between the different existing protection devices, in order to guarantee the selectivity of the system.

 

distribution circuits protection and coordination

image: e-worxtraining.ca

 

Also, coordination of protections is commonly used in medium voltage distribution networks and low voltage systems due to the nature of the network itself. Read Electrical Engineer Nico’s writing about the topic below…

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Impact of Current Transformers errors on protective relays

January 23rd, 2019 | Make a comment | Posted in Electrical Safety
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Picture 1. Bus through-fault currents

Picture 1. Bus through-fault currents

 

Current transformers are the interconnection element between the power system and all measurement devices like protective relays. CTs actually lower the value of the primary current to a nominal secondary level in order to be used by meters, protective relays, meters, and monitoring devices.

Here’s a list of the impacts of current Transformers errors on protective relays written by Electrical Engineer Mile.

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Shielding of MV transmission lines and substations from lightening strokes (part 2)

January 4th, 2019 | Make a comment | Posted in Electrical Safety
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In this article, we will try to discuss the outlook of lightning protection inside the premises of an electrical substation… Enjoy and please comment below!

Lightning protection Introduction in context to part one

Lightning strikes are a natural phenomenon and high power surges regularly hit the vulnerable parts of earth’s crust. Electrical installations including the transmission lines and sub stations are quite vulnerable for lightning to strike due to the following reasons;

A substation gantry under lightning attack

A substation gantry under lightning attack

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Shielding of MV transmission lines and substations from lightening strokes

December 17th, 2018 | Make a comment | Posted in Electrical Safety
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Lightning strokes are nature’s crude way of disposing-off excess frictional energy dissipation among clouds. Arcs ranging up to thousands of volts break the insulation of air and strike the highest and vulnerable points on ground.

A transmission tower under lightning attack

A transmission tower under lightning attack

If not controlled and provided an alternative path, these surges can destroy almost any structure that comes between their paths to the ground. Read this article by Kam, an electrical engineer who sent us this essay by email.

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