The transient component of the high-resistance single-phase grounding fault signal is not only the main influencing factor of the fault transition resistance

but also restricted by the following influencing factors

which in turn affects the accuracy of the transient criterion line selection: In case of fault of distribution network the grounding mode of the used system phase angle

the distance from the fault point to the bus

the length of the outgoing line of the fault

etc. Among them

the grounding mode of the system is caused by the design of the distribution network system itself and is not affected by the randomness of the fault itself. Therefore

its influence is fundamental to the study of the transient components of the high-resistance single-phase grounding fault characteristics. In this paper the Matlab-Simulink simulation platform is used to focus on the simulation analysis of the transition resistance value and the neutral grounding mode on the transient component of the high-resistance single-phase grounding fault. The influence of high transition value and several non-effective grounding mode of several neutral point affects on the transient component of the high-resistance single-phase grounding fault under the three-phase unbalanced condition close to the real situation is particularly explored. The results show that the transition resistance of high-resistance single-phase grounding fault is smaller

the compensation of arc suppression coil of system is smaller or the neutral point is not grounded

which will affect the transient component of high resistance single phase grounding fault and keep its strength larger and signal to noise ratio higher.