In the cable line grounded at one end of the metal sheath, in order to ensure that the induced voltage in the sheath does not exceed the allowable standard, a conductor laid along the cable line in parallel must be installed, and both ends of the conductor are grounded. This conductor is called a return line.
When a single-phase ground fault occurs, the ground short-circuit current can flow back to the system center point through the return line, and the magnetic flux generated by the ground current through the return line cancels the magnetic flux generated by the ground current of a part of the cable lead, thereby reducing The induced voltage of the sheath in the event of a short circuit fault.
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