This paper presents that the protection for the phase to phase fault should be composed of high frequency teleprotection channel and overreached distance relay.
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。
The basic principle of new types of protection which present relay protection experts have proposed, such as shape wave protection, non-channel protection and so on, is introduced.
介绍了当前继电保护专家们提出的行波保护、无通道保护等新型保护的基本原理。
For a practical project, ideas of scheming the relay protection for double-circuit lines on the same tower and choosing the telecommunication channel are analysed.
结合某工程实例，剖析同杆双回线路保护配置和保护远传信号通道选择的思路。
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