Monthly Archive for: «July, 2012»

Sizing and protection of the neutral conductor (2)

Continued from the first part – Sizing and Protection of the Neutral Conductor (1) Protection of the neutral conductor Protection against overload If the neutral conductor is correctly sized (including harmonics), no specific protection of… Read more

Jul 31, 2012 | Edvard

Sizing and protection of the neutral conductor (2)

Sizing and protection of the neutral conductor (1)

Introduction 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 The method of… Read more

Jul 30, 2012 | Edvard

Sizing and protection of the neutral conductor

Types of Cable Installations in Electrical Network

Installing power cables There are a variety of ways to install power distribution cables. Each method ensures distribution of power with a unique degree of reliability, safety, economy, and quality for any specific set… Read more

Jul 27, 2012 | Edvard

Types of cable installations in electrical network

Overvoltages in the IT system

Introduction to overvoltages 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. These overvoltages are particularly taken into account… Read more

Jul 26, 2012 | Edvard

Single insulation fault on a network operated in IT earthed system

Isolating the Fault With Time-based Discrimination

Principle of 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 | Edvard

Isolating the Fault With Time-based Discrimination

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 exposed aboveground substations. Air… Read more

Jul 21, 2012 | Edvard

Gas insulated switchgear (GIS) - Siemens

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 in the distribution network… Read more

Jul 20, 2012 | Edvard

Effect of lightning strike on electrical lines
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