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Archive: Category «Protection»

Surge Protection of Electronic Equipment

Generally, power circuits have components that have large thermal capacities, which make it impossible for them to attain very high temperatures quickly except during very large or long disturbances. This… Read more

Sep 22, 2012 | Edvard

Surge Protection of Electronic Equipment

Introduction to Static Protection Relays

The term ‘static’ implies that the relay has no moving parts. This is not strictly the case for a static relay, as the output contacts are still generally attracted armature… Read more

Sep 21, 2012 | Edvard

RSR-72 Static relay for motor re-start and reacceleration

What is the purpose of equipotential bonding?

Equipotential bonding is essentially an electrical connection maintaining various exposed conductive parts and extraneous conductive parts at substantially the same potential. An earthed equipotential zone is one within which exposed… Read more

Sep 20, 2012 | Edvard

Purpose of Equipotential bonding

Functions Performed by Electrical Switchgear

National and international standards define the method for making electrical distribution circuits as well as the purpose and functions of switchgear. There are three main functions, namely: Circuit protection takes… Read more

Sep 14, 2012 | Edvard

Functions Performed by Electrical Switchgear

Transformer differential protection (ANSI 87T)

Transformer differential protection protects against short-circuits between turns of a winding and between windings that correspond to phase-to-phase or three-phase type short-circuits. If there is no earthing connection at the… Read more

Sep 05, 2012 | Edvard

SIPROTEC 4 7UT6 Differential Protection Relay for Transformers

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 | Edvard

Delayed auto-reclose scheme logic

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