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Archive: Category «Protection»

Power Substation

Complete overview of lightning arresters (1)

Lightning can create voltage surges in several of the following ways. Lightning can score a direct hit on your house. It can strike the overhead power line which enters your… Read more

Sep 23, 2011 | By jiguparmar

Complete overview of lighting arresters
Power Substation

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 | By Edvard

Six-foot black snake the culprit in power outage
Protection

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 | By Edvard

Energy and Power

Surge arrester types and auxiliary equipment

Nearly 100 years ago, electrode gaps (rod, sphere, or pipe) were used to limit overvoltages on equipment (Sakshaug, 1991). Some of these systems, particularly pipe gaps, may still be in… Read more

Aug 25, 2011 | By Edvard

Lightning arrestors being installed at Kingston sub-station in 1928. Photo: ACTEA.
High Voltage

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 | By Edvard

Capacitor protection by surge arresters
Energy and Power

Applications and forms of differential relays

Differential relays take a variety of forms, depending on the equipment they protect. The definition of such a relay is “one that operates when the vector difference of two or… Read more

Aug 15, 2011 | By Edvard

ABB Residual Current Breaker with Overload Protection RCBo
Energy and Power

Whole-House Protection Strategy

No single SPD (Surge Protection Strategy) can protect all the equipment in a residence from all causes of electrical surges. Instead, a whole-house protection strategy, consisting of point-of-entry and point-of-use… Read more

Aug 13, 2011 | By Edvard

SIEMENS - Whole-House Protection Strategy
Low Voltage

How residual current device (RCD) works?

The residual current device (rcd) is used to detect earth fault currents and to interrupt supply if an earth current flows. The main application is to prevent electrocution but RCDs… Read more

Jun 11, 2011 | By Edvard

Figure 1 - Residual current device components
High Voltage

MiCOM P139 – Feeder Management and Bay Control

MiCOM P139 is a cost-effective one-box solution for integrated numerical time-overcurrent protection and control. The unit’s protection functions provide selective short-circuit protection, ground fault protection and overload protection in medium-… Read more

Mar 30, 2011 | By Edvard

MiCOM P139 Feeder Management and Bay Control
Protection

Distance Relays

Distance relays respond to the voltage and current, i.e., the impedance, at the relay location. The impedance per mile is fairly constant so these relays respond to the distance between… Read more

Nov 12, 2010 | By Edvard

Distance relays


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