Premium Membership ♕

Learn from experienced engineers and study specialized technical articles, guides & courses. Save 50% on courses with the Enterprise Plan.

Increasing availability of LV electrical networks
Increasing availability of LV electrical networks (Schneider Electric)

Faults and disturbances in low voltage networks

The short-circuit

Short-circuits are normally caused by accidental contact between two power or earth conductors. A phase-to-earth insulation fault is equivalent to a phase-to-neutral short-circuit in TN.S earthing systems.

Phase-to-neutral, phase-to-phase and phase-to-earth short-circuit
Phase-to-neutral, phase-to-phase and phase-to-earth short-circuit

The major fault categories are:

  1. Short-circuits
  2. Overloads
  3. Insulation loss.

The major disturbance categories are:

  1. Leakage currents
  2. Surges
  3. Harmonics.

Rodents can survive for a number of months, without water, feeding only on the electrical cables placed in busbar trunkings. Crawling animals, that are longer, can bring two live parts of an electrical installation into contact.

Routings of mobile cables such as those of travelling cranes, robots and automatic machines are frequently affected by short-circuits resulting from crushing or tearing or from ageing of the electrical conductor insulator. During earthwork, excavators and mechanical machinery can sever all types of electrical power supplies.

The overload

The causes of tripping of protection devices due to overloads in an electrical installation are many.

However two main causes can be identified:

1. The electrical installation changes over time and nominal current is exceeded when the number of loads increases. This is for example the case of an increase in machine installed base, number of workstations, terminals, amount of traffic, etc.

2. Loads consume more current than normal due to a malfunction, for example: clogged lifting pumps, obstructed ventilation systems, overloaded or incorrectly serviced traversers, improperly adjusted or maladjusted systems, deterioration over time of parameters leading to reduced efficiency generating increased power, etc.

AUTHOR: Schneider Electric experts

Title:Schneider Electric Low voltage expert guides – Increasing availability of LV electrical networks
Download:Right here | Video Courses | Membership | Download Updates
Increasing availability of LV electrical networks
Increasing availability of LV electrical networks

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
50% Discount 💥 - Save 50% on all 90+ video courses with Enterprise Membership plan.

More Information

One Comment

  1. Edward
    Mar 03, 2015

    I love this

Leave a Comment

Tell us what you're thinking. We care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

Enter Captcha Here :

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).
EEP Academy Courses - A hand crafted cutting-edge electrical engineering knowledge