介绍了电力系统保护信号的特点及其传输方式，并分析了各种传输方式的利弊。

The characteristic of power system protective relaying signal is introduced, all kinds of its teletransmission form are analysed.

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随着光纤技术的迅猛发展，利用光纤传输继电保护信号，已获得了业内人士的普遍欢迎。

With the development of fiber optic cable technology, transmitting relay protection signal through optic cable are getting more and more popular.

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本文重点阐述LH集成电路与保护信号装置原理，并分析弱电保护干扰问题及抗干扰措施。

In this paper, the principles of LH integrated circuit and signalling are introduced. The problems of disturbance and adopted measures against disturbance are also analyzed.

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