Posts Tagged ‘short circuit’

Requirements for a good grounding system (400 kV power line)

July 6th, 2017 | Make a comment | Posted in Power quality
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megaphone-yellowMile is one of the community members. He’s a young electrical engineer from Macedonia who likes to share is experience.

Let’s read his essay on grounding systems, based on what he’s experienced in his recent career.

And if you want to share your experience as a young electrical engineer, do not hesitate to contact us.

It is very well known, that in case of short circuit in the power system, the current that appears on the place of the short circuit, is directly transferred to the earth.

The value of the current, which flows through the power lines and in the grounding system itself, and the short circuit time, depend of the type of the grounding of the neutral point of the network and the characteristics of the relay protection system.
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How to specify medium voltage switchgear (for industrial plant)

January 22nd, 2016 | Make a comment | Posted in Panel Building
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Ismael is specialized in designing electrical systems (LV and MV) for commercial, industrial, and residential. Let his 5 years of experience enlighten you and read now the answer to how to specify medium voltage switchgear for industrial plant!

IP codes

As Medium Voltage Switchgear often entirely enclosed within the building, it is paramount to specify the specification for its enclosure. IP code (Index of Protection or International Protection or Ingress Protection) state the environmental protection against the ingress of solid foreign objects and water.
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Selection of Miniature Circuit Breaker

April 15th, 2014 | 9 Comments | Posted in Electrical distribution
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Thanks to Manish, another member of the electrical engineering community, for sending us this article about MCBs. Remember you can also send us articles about the topic you want by a mail

MCB stands for Miniature Circuit Breaker. It is a vital circuit breaking component found in today’s modern electrical distribution system. It replaces earlier method of circuit breaking done via melting fuse wire.

A melting fuse wire system is replaceable type of circuit breaking in which the fuse wire melts and permanently breaks the circuit upon an overload current event. Due to this hence it is quite cumbersome to each time replace and fix a new fuse wire.

A miniature circuit breaker on other hand is reusable type of circuit breaking device that is nowadays widely used in homes and offices.

Working Principle

While the main purpose of this article is about selection of MCBs, it is worth summarizing the working principle of MCBs in brief.

MCB is a compact cased device that has an electro-mechanical mechanism inside that provides overload protection.

There are essentially three different mechanisms inside that provide overload protection:

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Effective monitoring of AC motors

December 9th, 2013 | Make a comment | Posted in Energy Efficiency - motors
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When it comes to the usage of home appliances, one of the most important areas is that of short circuits.

Effective monitoring of AC motors 1

There are a number of reasons behind this issue, but the important point is that the issues can be resolved by opting for some measures.

Short Circuit

The first thing to know about the domestic appliances that you use have a certain operating limit. Due to large scale consumption, some devices have “overshooting” issues.

The overshooting has a significant outcome; there is a direct contact between two points of different electric potential, leading to a short circuit.

In the case of AC supply, the short circuit can be either:

  • Phase to phase contact
  • Phase to neutral contact
  • Phase to ground contact
  • Contact between windings in a phase

In the case of DC supply, the reason is either the contact between two poles or between the ground and the pole insulated from it.

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Parallel transformer electrical distribution

April 30th, 2009 | 11 Comments | Posted in Electrical distribution
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breaker selectivityRedondancy of supply is often a must ; protection coordination is not easy to master : case of parallel MV/LV transformers.
This case is typical for hospital and even office building where service continuity constraint is high. (more…)

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