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Archive: Category «Protection»

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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 | Edvard

SIEMENS - Whole-House Protection Strategy

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 | Edvard

Figure 1 - Residual current device components

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 | Edvard

MiCOM P139 Feeder Management and Bay Control

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 | Edvard

Distance relays
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