Commissioning
19
3.3
Electrical Connection: Special Applications
This method of prelocating a fault should only be used when absolutely unavoidable,
e.g. when no second, fault-free auxiliary conductor is available.
The precision will be impaired in the same way as the simple Murray loop bridge is
impaired by the effects of the contact resistances, but should remain comparatively
higher.
Furthermore, the auxiliary conductor must be fault-free. It is connected as follows:
For this type of prelocation, the
double cable length
must be entered!
If both conductors are not of the same type (cross section, conductor material,
length), they should be treated like a mixed cable with two sections (with the
faulty conductor being the first section) during prelocation.
Prelocation using one
auxiliary conductor only
