Device is followed to secondary control cable distal end voltage

The utility model discloses a device is followed to secondary control cable distal end voltage, including: the secondary control cable, the shielding layer ground connection of one of which open end, another open end is defined as the A end, and the shielding layer of this A end passes through ground connection behind the high -pass filter circuit, the shielding layer of electric connection secondary control cable shield layer's A end is held to converter, its voltage output, the controller, its voltage signal and frequency signal who detects secondary control cable A end shield layer to with converter control connection, the voltage source is for above -mentioned converter and controller power supply. The utility model discloses reduction cable shield layer electromagnetism circulation that can be very big, do not influence the shielding that the shielding layer disturbed to lightning current, switching overvoltage etc. And this type is shielded for cable shield layer's main shielding object. 本实用新型公开种二次控制电缆远