PEF-5 Percentage Earth Fault Protection Unit from FDB Electrical

▤ Summary

Isleworth, United Kingdom, September 21, 2014 --( They found that zero sequence C.T.’s can be costly and difficult to install, particularly in retro-fit applications, whilst traditional types of spill current earth fault protective devices have the disadvantage of being somewhat crude in accuracy.However, in the event of a short circuit to earth where continuity has deteriorated due to terminal corrosion or a loose connection, then a short to earth becomes current limited and will not “blow” the upstream fuse fast enough to prevent the contactor opening under high overcurrent trip.Typically, for every 1% of voltage imbalance on a 3 phase motor, the effective internal current increase (not externally measurable) will be approximately 8 times as high.Isleworth, United Kingdom, September 21, 2014 --( PR.com )-- The engineers at FDB Electrical developed the PEF-5 Percentage Earth Fault Unit for high KA capacity installations where there is a need for a practical, cost-effective method of detecting potentially dangerous earth fault currents before damage is caused to contactors, cables or plant.They found that zero sequence C.T.’s can be costly and difficult to install, particularly in retro-fit applications, whilst traditional types of spill current earth fault protective devices have the disadvantage of being somewhat crude in accuracy.Therefore the PEF-5 was developed to provide an optimum solution and can be set to detect leakage currents as low as 2% of load current simply by utilising the existing protection or instrument C.T.’s.It is understood that in 98% of applications the C.T.’s used have 5 Amps secondaries and so the PEF-5 is designed to monitor the secondary current accordingly.Typically, for every 1% of voltage imbalance on a 3 phase motor, the effective internal current increase (not externally measurable) will be approximately 8 times as high.

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