ABB TJC 4_1VLC000520 Indoor voltage transformers,
The TJC 4 single-pole insulate voltage transformers cast in epoxy resin,
and designe mostly for insulation voltages of 3.6 kV to 12 kV.
If no other value is require the transformers are manufacture,
with a overvoltage factor of 1.9 x Un/8 hrs.
One outlet of the primary winding, including the respective terminal is insulate from the earth to a level,
which corresponds to the rate insulation value.
The transformer is mostly equippe with two secondary windings,
the first one for either measuring or protection purposes,
the other for being connecte into an open-delta connection in a threephase system.
One terminal of each secondary winding and one of the open-delta connecte terminals have to be earthe during the transformer operation.
When not require otherwise, the secondary windings are lead out into a casttype secondary terminal board.
