Spare power automatic switching method and device for 500kV charging line

Abstract

The invention provides a spare power automatic switching method for a 500kV charging line. The spare power automatic switching method is used for a same-tower double-loop 500kV line comprising a line A and a line B. The spare power automatic switching method comprises the following steps of: detecting on-off states of preset switches and preset line knife switches corresponding to the line A and the line B respectively, and determining a normal operation line and a charging operation line in the line A and the line B; if the preset switch corresponding to the normal operation line is in a switched-off state and the flowing current is smaller than a first preset value, determining that the normal operation line is tripped off, and enabling the corresponding preset switch of the charging operation line to be in a switched-off state after misoperation does not occur in protection; and if the corresponding preset switch of the charging operation line is switched off and the flowing current is smaller than a second preset value, switching on the preset line knife switch on the charging operation line, and switching on the corresponding switched-off preset switch of the charging operation line again, thereby making the charging operation line automatically switched from hot standby to normal operation. With the method and device of the invention adopted, the standby line can be quickly put into normal operation, the operation is simple, and time and labor are saved.

Description

technical field [0001] The invention relates to the technical field of power grid line standby self-switching, in particular to a method and device for 500kV charging line standby self-switching. Background technique [0002] With the improvement of the reliability of power supply, the application of standby automatic switching devices is becoming more and more widespread, especially in urban power grids. In order to reduce the short-circuit current of the 500kV power grid, one turn of the double-circuit 500kV line on the same tower is often used for charging operation to increase the line impedance, thereby solving the problem of excessive short-circuit current. [0003] However, when only one return of the original double-circuit line is in normal operation, the 500kV power grid grid will be severely weakened, resulting in a large number of section overload problems, especially when the operating line fails, but the charging line cannot automatically switch from hot standb...

AI Technical Summary

Problems solved by technology

[0003] However, when only one return of the original double-circuit line is in normal operation, the 500kV power grid grid will be severely weakened, resulting in a large number of section overload problems, especially when the operating line fails, but the charging line cannot automatically switch from hot standby to normal Runtime

[0004] In order to solve the above problems, it is often necessary for dispatchers to direct substation operators to perform complex switching operations, which takes a long time (estimated to be more than half an hour), resulting in serious operational risks for the power grid during the operation

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