Abstract: The current carrying capacity of AC cables is increased by the way of interphase parallel. The asymmetry of cables arrangement leads to the uneven distribution of interphase current and the unbalance of three-phase current. In this paper, a compensation method for split reactor (HCSR) based on the differential mode principle is proposed. The influence factors of cables arrangement, grounding mode, distance and length on self-inductance parameters of HCSR compensation are studied by calculating examples. The results show that: when the cables’ length is 20 km, the maximum current non-uniformity is 41.47% under different wiring modes and arrangement modes, and it can reduce to less than 5% after HCSR compensation. When the self-inductance of HCSR is constant, the greater the current difference between the two arms, the greater the equivalent reactance that can be compensated to the cables; when the equivalent reactance of the cables needs to be compensated, the smaller the difference between the two arms current, the larger the HCSR self-inductance required. When the cables’ length is less than 20 km and the distance is less than 0.46 m, the maximum HCSR self-inductance required for compensation is 5.85 mH.