The invention discloses a 110kV line disconnection relay protection method for comparing voltages on two sides of a line, which fully utilizes the fault characteristics of PT secondary voltages of a power supply end and a load end 110kV bus of a transformer substation when. The invention discloses a 110kV line disconnection relay protection method for comparing voltages on two sides of a line, which fully utilizes the fault characteristics of PT secondary voltages of a power supply end and a load end 110kV bus of a transformer substation when. In this paper, the main electric wiring mode of 110kV substation is selected, the structure of substation is determined, and then the main wiring diagram is drawn. According to the design and load of the primary electrical connection, select the maximum and minimum operating modes to calculate the. TL;DR: In this article, the relay protection of transmission lines, transformers, busbars, etc. is set, and the configured protections include current quick-break protection, gas protection, and longitudinal differential protection. For the analogical relay the. Along with the rapid development of our country's power system, especially with the power system scale's expansion and the voltage rank's enhancement, the request of design a valuable microcomputer relay protective device is different from ever. The microcomputer relay protective devices which.