Fixing system: to wall or to DIN rail by an accessory; directly to cable by screws.

Measuring Transformers

• The double terminal entry allows short circuit links to be fitted when it is necessary to disconnect the measuring instrument from the transformer without damage to the CT, or for easier termination to ground of the CT
• Different characteristics on request.

Protection Transformers

The C.T. when used as a current generator for protection relays has electrical characteristics which differ from those of the measuring transformer.

Infact the measuring C.T. is expected to give a saturation of the magnetic circuit with 5P in primary currents while, in the case of protective C.T., it is necessary for the secondary current value to follow the increase in the primary current up to 10-15-20 In, so as to guarantee the intervention of the relay in the case of unforeseen breakdown current.

It is important not to load the C.T. with a P performance which is greater than that indicated, so as not to modify the saturation value of the C.T.P=RI2 where:
P= load on the C.T.
R= resistance of the relay + resistance of the cables
I= nominal secondary current of the C.T.

Different characteristics on request