Hot standby protection method for single-set 110kV line protection for 220kV intelligent substation

The invention discloses a hot standby protection method for single-set 110kV line protection for a 220kV intelligent substation. The hot standby protection method for the single-set 110kV line protection for the 220kV intelligent substation includes that firstly, realizing dual-running for single-set line protection to be disabled, switching the fixed value of a hot standby line protection device B into a fixed value of a line protection device A to be disabled, accessing the corresponding current, voltage and switching value input into the line protection device A into the hot standby line protection device B, and tripping the hot standby line protection device B to access into corresponding primary equipment; secondly, after the hot standby protection sampling and running are normal, quitting the original running line protection to enable the line protection device A to quit a working state; thirdly, after the line protection device A which quits running finishes working, restoring a loop and a passage; fourthly, after the sampling and running states of the original line protection device A are normal, quitting the original running line protection, restoring the running of the line protection device A, and enabling the hot standby line protection device B to quit the working state.