提出只有将高频通道、超范围距离元件配合构成允许式纵联距离保护，才能保护同杆双回线跨线不接地故障。

This paper presents that the protection for the phase to phase fault should be composed of high frequency teleprotection channel and overreached distance relay.

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从理论上分析了同杆并架双回线跨线不接地故障时距离继电器测量阻抗的变化规律。

This paper analyses the rule of variations measuring impedance of distance relay when phase to phase fault occurs between two lines on double circuit line on the same pole (DLSP).

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