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Archive: Category «Protection»

Protection

Delayed Auto-Reclosing On EHV Systems

On highly interconnected transmission systems, where the loss of a single line is unlikely to cause two sections of the system to drift apart significantly and lose synchronism, delayed auto-reclosing can be employed…. Read more

Aug 11, 2012 | By Edvard

Delayed auto-reclose scheme logic
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

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
Electric Motor

Thermal (Overload) Motor Relay Protection

The majority of winding failures in motor are either indirectly or directly caused by overloading (either prolonged or cyclic), operation on unbalanced supply voltage, or single phasing, which all lead… Read more

Jul 14, 2012 | By Edvard

Thermal (Overload) Motor Relay Protection
Energy and Power

MCB – Miniature Circuit Breaker Construction

The miniature circuit breaker (MCB) plays an important role in providing overcurrent protection and a disconnect means in electrical networks. Recent advancements in circuit breaker technology has increased breaker performance and protection…. Read more

Jun 07, 2012 | By Edvard

MCB - Miniature circuit breaker construction
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)
High Voltage

Ceramic (Porcelain and Glass) Insulators

Porcelain is the most frequently used material for insulators. Insulators are made of wet, processed porcelain. The fundamental materials used are a mixture of feldspar (35%), china clay (28%), flint… Read more

Jan 27, 2012 | By Edvard

Porcelain insulators collection
Energy and Power

The Need for Breaker Failure Protection

Circuit breakers are strategically located in power systems to connect circuits and electrical apparatus. Circuit breakers are commanded to open and close by protection and control systems that monitor conditions… Read more

Jan 01, 2012 | By Edvard

Eaton - Magnum circuit breaker
Protection

Transformer Protection – Abstract from NEC

According to NEC 450.4, “each transformer 600 volts, nominal, or less shall be protected by an individual overcurrent device installed in series with each ungrounded input conductor.” Such overcurrent device… Read more

Dec 26, 2011 | By jiguparmar

Transformer protection - Aabstract from NEC (National Electric Code)


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