Archive for the ‘Electrical Safety’ Category

Breakdown voltage: what happens when insulation fails?

February 28th, 2019 | Make a comment | Posted in Electrical Safety
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An electrical insulation is a material that reduces or prevents the passage of electricity from one conductor to another due to its high level of electrical resistance. Let’s read Ginnie’s essay about electrical insulation failure.

The main purpose of insulation is to prevent any electrical shocks and reduce the possibility of any kind of electrical failures, making of is one of the most necessary aspects to take into account in the industry of electricity.

The reasons why insulation fails vary depending on the type of material and the element to be insulated. The following provides a description of the main reasons for insulation failure:

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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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