Guia Técnico ABB - Diferenciais Tipo B (EN)

ABB

Guia Técnico ABB - Diferenciais Tipo B (EN)

Publicado: 23 de maio de 2016 · Categoria: Cadernos técnicos

Deste documento

Special Insert Everything you wanted to know about Type B residual current circuit breakers but never dared to ask Claudio Amadori: R&D ABB T ype AC or Type A RCDs, compliant with the Standards IEC/ EN 61008 and IEC/ EN 610091), are suitable for most types of household and similar applications. However, the increasing use of power electronics technologies in Consumer appliances with earth connection can result in leakage currents having waveforms with a high DC component and/or high frequency, in both fault and fault-free conditions. These currents, not intended for Type A or Type AC residual current circuit breakers, could affect their proper operation. It must be said that Type A RCDs, as a rule, are immune to the residual current overlap of a direct current up to 6 mA. In case of direct current leakage over 6 mA, the proper operation of Type A circuit breakers is not guaranteed. Depending on the case, the Type A or Type AC residual current circuit breaker could therefore present the following drawbacks: desensitization of the residual current circuit breaker which may not trip properly in the event of a ground fault of equipment that generates currents with a high DC component or high frequency (failed tripping, delayed or excessive residual current values); desensitization of the residual current circuit breaker which may not trip properly in the event of a fault on another circuit powered from the same RCD (even if this fault current has a sinusoidal alternating...