Abstract: To study the problem of interference of metal sheath induced voltage in 35 kV power supply ring network cable during the normal power frequency operating condition,taking Metro Line 19 second phase project of certain city as an example, the simulation model under different operating conditions is established by ATP-EMTP electromagnetic transient simulation software, load current, cable length,cable layout type and other factors of the cable conductor are simulated and analyzed. The results show that under normal operating condition,the induced voltage of the metal sheath on the sheath voltage limiter side is greatly affected by the load current, cable length, and cable layout type, while the induced voltage value on the direct ground side is relatively small. And the induced voltage of the metal sheath on the sheath voltage limiter side is linear with the cable length and load current. When the cable length is 6 km,the induced voltage will reach 330.62 V,which exceeds the 300 V required by design specification. The cable grounding method is recommended to adopt cross-connect method.