Major loop current measuring device for high-voltage direct current transmission converter valve, has integrating circuit whose output is connected with voltage divider, where output of voltage divider outputs measuring signal

The device has a magnetic core (2a) arranged with coil (5a) and placed in a shielding shell (1a). Another magnetic core (2b) is arranged with another coil (5b). The latter magnetic core, an integrating circuit (3) and a voltage divider (4) are arranged in another shielding shell (1b). An input of the integrating circuit and the latter shielding are connected with the latter coil. An output of the integrating circuit is connected with the voltage divider. An output (13) of the voltage divider outputs a measuring signal. A magnetic fixture (6a) is arranged in the former shielding shell.