Research and Application of Busbar Protection Based on Multidimensional Virtual Current Differential

    Introduction   Paper aims that the busbar protection can reliably and quickly remove the fault bus when the disconnecting switch is wrong in the process of bus switching operation, the principle of bus double-position switch configuration and virtual current differential mutual calibration is put forward, and its theoretical analysis and dynamic model simulation test are carried out.

    Method   Based on the above requirements, the virtual current differential logic assisted by dual position information of switch can solve the problems in the switching process of substation.

    Result   In terms of mathematic quantization theory, the double position information of bus protection cutter and switch reduces the possibility of location error, and then assisted by virtual current differential logic to correct the error, can very well avoid substation switching operation problems leading to bus non-selective tripping.

    Conclusion   Busbar protection can be connected to double-position switch auxiliary opening and assisted by virtual current differential logic criterion, which can effectively correct the abnormal position of switch during switching operation for bus, thus ensuring the selectivity and reliability of bus protection.