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Monthly Archive for: «July, 2012»

Cables

Sizing and protection of the neutral conductor (1)

Sizing (c.s.a.) and the protection of the neutral conductor, apart from its current-carrying requirement, depend on several factors, namely: The type of earthing system, TT, TN, etc. The harmonic currents… Read more

Jul 30, 2012 | By Edvard

Sizing and protection of the neutral conductor
Energy and Power

Overvoltages in the IT system

Electrical networks can be subject to overvoltages of varying origins. Some overvoltages, such as differential mode ones (between live conductors) affect all the earthing systems. This section is particularly concerned… Read more

Jul 26, 2012 | By Edvard

Single insulation fault on a network operated in IT earthed system
Energy and Power

Isolating the Fault With Time-based Discrimination

Protection functions form a consistent system depending on the overall structure of the power distribution system and the neutral earthing arrangement. They should therefore be viewed as a system based… Read more

Jul 22, 2012 | By Edvard

Isolating the Fault With Time-based Discrimination
Energy and Power

Bus Design In Aboveground Substations

Substations can be constructed partly or entirely within aboveground or belowground enclosures. However, cost is high and complexity is increased by fire-protection and heat-removal needs. The following discussion deals with… Read more

Jul 21, 2012 | By Edvard

Gas insulated switchgear (GIS) - Siemens
Energy and Power

Effect of Lightning Strike on Electrical Lines

The foregoing discussion concentrated on the principles of lightning strikes and how their effects can be mitigated. However, lightning strikes on electrical lines or substations are those that cause problems… Read more

Jul 20, 2012 | By Edvard

Effect of lightning strike on electrical lines
High Voltage

Shunt Reactor Used In HV and EHV Systems

Main Power System parameters are System Voltages and Frequency which normally indicate the healthiness level (they indicate the level of Generated active and reactive Powers against the load power requirement)…. Read more

Jul 17, 2012 | By Edvard

345kV Shunt Reactor and Associated Primary Equipment
Medium Voltage

Field Inspection of New Medium-Voltage Switchgear

Step Description of what you should do 1.1 Check switchgear assembly for alignment, levelness, and tightness of all bolting. 1.2 Check all equipment for the removal of blocking, supports, temporary… Read more

Jul 16, 2012 | By Edvard

DNF7 40.5kV Medium-voltage switchgear field inspection (In Schneider Electric factory)
High Voltage

Autoreclosing in Transmission and Distribution Systems

Two main functions of Utility Electric System Operations department are Control and Protection. Control function deals with all operational aspects involved in efficient and optimal dispatching of available real power… Read more

Jul 15, 2012 | By Edvard

Autoreclosing in transmission and distribution systems


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