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2 - Fagor Automation

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i<br />

IT type mains<br />

Distribution diagram that has no point connected directly to ground. The<br />

conductive parts of the installation are connected to ground.<br />

In this type of mains, the differential breaker is used assuming that the capacitance<br />

of mains with respect to ground is large enough to ensure that<br />

a minimum fault current flows with the same magnitude as that of the operating<br />

differential current assigned. Otherwise, its use is not necessary.<br />

FACTORY LINE<br />

TRANSFORMER<br />

FACTORY LINE<br />

TRANSFORMER<br />

L1<br />

L1<br />

L2<br />

L3<br />

L2<br />

L3<br />

DIFFERENTIAL<br />

BREAKER<br />

DIFFERENTIAL<br />

BREAKER<br />

F. H6/6<br />

Installation diagram of an IT type mains.<br />

MAINS<br />

FILTER<br />

A<br />

MAINS<br />

FILTER<br />

A<br />

INFORMATION. Note that an IT type mains can also be controlled<br />

through an isolation watching device. Both protection measurements are<br />

compatible with each other.<br />

Power line connection<br />

DDS<br />

DDS<br />

POWER LINE CONNECTION<br />

Types of mains 6.<br />

DDS<br />

HARDWARE<br />

Ref.1307<br />

245

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