What should we pay attention to when connecting current transformers in series? Some friends do not know this kind of problem, Xiaobian today for you to introduce:

In practice, there is a basic principle when connecting the current in series: the primary winding resistance should be connected in series with the circuit of the power supply under test, and the secondary winding resistance needs to be connected in series with the load of the equipment.

In order to avoid too much deviation, according to the size of the measured current, can be appropriately changed.

In addition, the secondary coil should be grounded in order to avoid the damage of the insulation layer caused by the intermediate voltage measurement into the low-voltage side of the secondary coil, which may cause safety accidents.

Note that the secondary coil side can not be cut off. When the current will dry up and the running state is, once the secondary coil side is opened, the induced electromotive force value of the magnetic regulator will become larger and the magnetic flux of the transformer core is in a saturated state.

When THE MAGNETIC FLUX EXCEEDS ZERO, THE SECONDARY WINDING WILL CAUSE A HIGH TOP WAVE, which can reach thousands OF VOLTS, which is a great danger to the personnel and equipment under operation.

The lead on the secondary coil side can lead to an increase of more than 100 volts in the operating voltage, which can lead to unimaginable consequences if accidentally touched. Therefore, the short circuit fault power switch should be set when the current transformer is connected in series.

If the installed current will dry up and have defense function, remove the protective equipment for maintenance. If the locations of the two current transformers permit, install them on both sides of the disconnector so that the disconnector can be crossed for maintenance.