Archive: Category «Protection»

Purpose of Miniature Circuit Breakers (MCBs)

Miniature circuit breakers (MCB) are primarily designed to protect cables and lines against overload (thermal) and short-circuit (electromagnetic). They thus care for protecting this electrical equipment against excessive temperature rises and destruction… Read more

Nov 24, 2012 | Edvard

Using Miniature Circuit Breakers (MCB)

HV Instrument Current Transformers in T&D

Electrical measurements on a high-voltage transmission and distribution systems cannot be made practically or safely with direct contact to the power carrying conductors. Instead, the voltages and currents must be… Read more

Nov 23, 2012 | Edvard

HV Instrument Current Transformers in Transmission and Distribution Systems

Stator Overheating Protection

All motors need protection against overheating resulting from overload, stalled rotor, or unbalanced stator currents. Consequently, to be sure that there will be an overload element in the most heavily… Read more

Nov 19, 2012 | Edvard

Stator Overheating 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)

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