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Archive: Category «Protection»

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Transformer Winding Faults

A fault on a transformer winding is controlled in magnitude by the following factors: Source impedance Neutral earthing impedance Transformer leakage reactance Fault voltage Winding connection Several distinct cases arise… Read more

Nov 02, 2011 | Edvard

transformer-winding-faults-front

Animal deterrents and security in substation

The vast majority of electrical utility substations designed to transform transmission voltages to distribution class voltages employ an open-air design. The configurations may vary, but usually consist of equipment that… Read more

Sep 05, 2011 | Edvard

Six-foot black snake the culprit in power outage

Bus protection – Overcurrent differential

When selecting relays for bus protection, a major concern is the ability of the protective relaying scheme to restrain from tripping for close-in line faults. Tripping for bus faults, the… Read more

Aug 31, 2011 | Edvard

Capacitor protection by surge arresters – ABB

Generally speaking, capacitor protection by surge arresters has been a difficult task before ZnO arresters became available. The high discharge currents and possible energies associated with an arrester operation at… Read more

Aug 22, 2011 | Edvard

Capacitor protection by surge arresters
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