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Archive: Category «Medium Voltage»

Energy and Power

Circuit breakers classified by interrupting medium

A circuit breaker is defined as “a mechanical switching device capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying and breaking for a specified… Read more

Jun 20, 2012 | By Edvard Csanyi

Oil circuit breakers
Medium Voltage

Erection Procedures For Medium Voltage Switchgear

Before commencing erection of medium voltage (MV) switchgear check that all connections are tight on busbars and on main and auxiliary circuits. Examine the insulation carefully, because there have been… Read more

Apr 03, 2012 | By Edvard Csanyi

Erection of ABB's Unigear medium voltage switchgear
High Voltage

Protection Of Generators And Transformers

As Generators and transformers are major components of a power system, so it is quite necessary to take all the preventive measures for the protection of transformers and generators. These… Read more

Feb 11, 2012 | By Bipul Raman

Protection of generators and transformers (Siprotec numerical protection relays)
Energy and Power

Glossary of Medium Voltage Switchgear Terms

This glossary was published originally by Schneider Electric and it is intended to cover the meaning of many common words and phrases used in association with medium voltage switchgear. Many… Read more

Jan 25, 2012 | By Edvard Csanyi

High Voltage

Segregated Phase Bus System

In this construction all the phases are housed in one metallic enclosure as earlier, but with a metallic barrier between each phase, as illustrated in Figure 1. The metallic barriers provide the required… Read more

Jan 18, 2012 | By Edvard Csanyi

Segregated phase bus system
Medium Voltage

ABB MV Switchgear – Single Busbar Or Double Busbar?

Most switchgear installations used in industry with normal service conditions are based on single busbar arrangements. Compared to double busbar switchgear, single busbar switchgear is definitely easier to use, readily understood… Read more

Jan 03, 2012 | By Edvard Csanyi

ABB Switchgear - single busbar or double busbar?
Cables

Partial Discharge Testing On Power Cable Systems

Partial discharge measurement is an important method of assessing the quality of the insulation of power cable systems, particularly for extruded insulation materials. This article considers partial discharge from two… Read more

Nov 18, 2011 | By Edvard Csanyi

On-Line Partial Discharge Testing 27.6 kV XLPE Cable
Energy and Power

Medium voltage circuit breaker operating sequence

Rated switching sequence according to IEC, O – t – CO – t’ – CO. (cf. opposite diagram): O – Represents opening operation CO – Represents closing operation followed immediately… Read more

Nov 10, 2011 | By Edvard Csanyi

Automatic reclosing cycle of medium voltage circuit breaker


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