DISPAROS INTEMPESTIVOS DE DIFERENCIALES

Authors

The Residual Current Devices (RCD)

commonly used in Spain are not ap

propriate to protect circuits with elec

tronic devices. In some circumstan

ces, this can lead to a safety problem,

but, in addition, this unsuitability cre

ates an increasing number of nuisan

ce RCD tripping.

Three circumstances concur in

this nuisance trippings : the use of

RCD designed for facilities in which

no connections to ground are consi

dered, the transient currents to

ground produced by appliance’s fil

ters and, as catalyst, an event that gi

ve rise to the tripping. When this

event is so important and frequent as

short-circuits in construction works,

the significant number or affected

customers reveals the real importan

ce of this problem.

Since a complete transient con

trol is impossible in an electrical net

work, the most appropriate solution

is to update the facilities’ protections,

so that they become prepared for cir

cuits with electronic loads.