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Archive: Category «Protection»

Transformer Differential Protection Principles

Similar to bus protections, transformers are protected by differential relays. Inter-winding faults (short circuits) and ground faults within power transformers can be detected by this protection scheme. Failure to detect… Read more

Nov 01, 2012 | Edvard

Transformer Differential Protection Principles

Overcurrent protection of transformer (NEC 450.3)

The overcurrent protection required for transformers is consider for Protection of Transformer only. Such overcurrent protection will not necessarily protect the primary or secondary conductors or equipment connected on the… Read more

Oct 08, 2012 | jiguparmar

Overcurrent protection of transformer (NEC 450.3)

Disturbances In LV Networks Due To Surges

There are two types of surge: those generated by a lightning impact and those resulting from electrical switchgear switching operations. Surges resulting from lightning strokes (see figure below) can affect… Read more

Oct 06, 2012 | Edvard

Disturbances Due To Surges

How to Protect Capacitor Banks?

Capacitor banks are used to compensate for reactive energy absorbed by electrical system loads, and sometimes to make up filters to reduce harmonic voltage. Their role is to improve the… Read more

Oct 05, 2012 | Edvard

How to Protect Capacitor Banks?

Inspection of Ground-Fault Protection Systems

This type of protection is defined by the NEC (National Electrical Code) to ensure protection against fire on electrical power installations. To ensure protection against fire: The NEC defines the… Read more

Sep 25, 2012 | Edvard

Inspection of Ground-Fault Protection Systems


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