短路处相与相(或地)的接触往往经过一定的电阻(如外物电阻、电弧电阻、接地电阻等)，这种电阻通常称为“过渡电阻”。
The contact between phase and phase (or ground) in short circuit often passes through a certain resistance (such as external resistance, arc resistance, grounding resistance, etc.). This resistance is usually called "transition resistance".
对于电网系统，经过渡电阻接地故障时短路电流会变小，使零序各段保护的拒动概率变大，而误动概率减小。因此高阻故障会对零序电流的拒动和误动概率产生一定的影响，从而影响到系统的风险值。
For power system, the short-circuit current will decrease when the transition resistance grounding fault occurs, which will increase the rejection probability of zero sequence protection and decrease the misoperation probability. Therefore, high resistance faults will have a certain impact on the probability of zero sequence current rejection and misoperation, thus affecting the risk value of the system.