针对220 k V线路保护装置或断路器改造中,进行保护双重化配置,以及操作继电器箱中防跃回路与断路器本体防跃回路共存时,引发的隐患问题进行介绍。同时阐述了双重化不合理配置将带来断路器拒动,进而起动母差失灵保护,造成母线所在机组停...针对220 k V线路保护装置或断路器改造中,进行保护双重化配置,以及操作继电器箱中防跃回路与断路器本体防跃回路共存时,引发的隐患问题进行介绍。同时阐述了双重化不合理配置将带来断路器拒动,进而起动母差失灵保护,造成母线所在机组停运、线路跳闸以及防跃回路共存将引起断路器在分断时卡涩进而引起拉弧,严重损坏断路器等一系列重大问题。展开更多
The new techniques were presented for preventing undesirable distance relay maloperation during voltage collapse and power swings in transmission grids. Initially, the work focused on the development of a fast detecti...The new techniques were presented for preventing undesirable distance relay maloperation during voltage collapse and power swings in transmission grids. Initially, the work focused on the development of a fast detection of voltage collapse and a three-phase fault at transmission lines by using under impedance fault detector (UIFD) and support vector machine (SVM). Likewise, an intelligent approach was developed to discriminate a fault, stable swing and unstable swing, for correct distance relay operation by using the S-transform and the probabilistic neural network (PNN). To illustrate the effectiveness of the proposed techniques, simulations were carried out on the IEEE 39-bus test system using the PSS/E and MATLAB software.展开更多
文摘针对220 k V线路保护装置或断路器改造中,进行保护双重化配置,以及操作继电器箱中防跃回路与断路器本体防跃回路共存时,引发的隐患问题进行介绍。同时阐述了双重化不合理配置将带来断路器拒动,进而起动母差失灵保护,造成母线所在机组停运、线路跳闸以及防跃回路共存将引起断路器在分断时卡涩进而引起拉弧,严重损坏断路器等一系列重大问题。
文摘The new techniques were presented for preventing undesirable distance relay maloperation during voltage collapse and power swings in transmission grids. Initially, the work focused on the development of a fast detection of voltage collapse and a three-phase fault at transmission lines by using under impedance fault detector (UIFD) and support vector machine (SVM). Likewise, an intelligent approach was developed to discriminate a fault, stable swing and unstable swing, for correct distance relay operation by using the S-transform and the probabilistic neural network (PNN). To illustrate the effectiveness of the proposed techniques, simulations were carried out on the IEEE 39-bus test system using the PSS/E and MATLAB software.