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Archive: Category «Medium Voltage»

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

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

Automatic reclosing cycle of medium voltage circuit breaker
Medium Voltage

VISAX – Medium Voltage Metal-clad Switchgear

Wherever electrical power must be distributed and used with maximum availability and reliability, we have the experience and the know-how to offer you the equipment which best meets these needs…. Read more

Oct 17, 2011 | By Edvard

VISAX MV Metal-clad Switchgear
High Voltage

GIS vs AIS – Substation Earthing

Compressed SF6 gas used in MV and HV switchgears as an insulating medium has led to the development of compact gas-insulated substation (CIS) technology (figure 1). GIS , having many… Read more

Sep 12, 2011 | By Edvard

GIS vs AIS - Substation Earthing
High Voltage

What Is a Load Break Switch?

A load break switch is a disconnect switch that has been designed to provide making or breaking of specified currents. This is accomplished by addition of equipment that increases the… Read more

Sep 08, 2011 | By Edvard

SF6 Insulated Load Break Switch for the use in medium voltage switchboards for secondary distribution networks.
High Voltage

AIS – Air insulated substations

In large, modern AC power systems, the transmission and distribution systems function to deliver bulk power from generating sources to users at the load centers. Transmission systems generally include generation… Read more

Sep 06, 2011 | By Edvard

Air Insulated Packaged Substations and Components
High Voltage

Budgeting and Financing Substation

The construction of new substations and the expansion of existing facilities are commonplace projects in electric utilities. However, due to the complexity, very few utility employees are familiar with the… Read more

Aug 16, 2011 | By Edvard

Budgeting and Financing Substation
High Voltage

GIS vs AIS – Life cycle assessment

In order to ensure the future supply of electricity we require sustainable concepts that preserve resources and do not harm our environment. Humankind needs a reliable and secure power supply… Read more

Jul 14, 2011 | By Edvard

gis-vs-ais-life-cycle-assessment
High Voltage

Power Fuses in High Voltage

Power fuses are a generally accepted means of protecting power transformers in distribution substations. The primary purpose of a power fuse is to provide interruption of permanent faults. Fusing is… Read more

Jul 11, 2011 | By Edvard

power-fuses-in-high-voltage
Medium Voltage

ABB – AIS UniGear ZS1 design features

UniGear ZS1 is medium voltage switchgear with a metal enclosure, suitable for indoor installations. Metal partitions segregate the compartments from each other and the live parts are air-insulated. Since the… Read more

Jun 06, 2011 | By Edvard

ABB - AIS (air insulated switchgear) UNIGEAR ZS1


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