本指南的范围是描述现场试验方法，以确保电流互感器（CT）正确连接，具有标记的比率和极性，并在初始和使用一段时间后处于设计状态。 附录A描述了接线完整性检查、测试插孔、电流短路开关和继电器测试设备的使用。 附录B说明了rms响应电压表（通常在现场条件下使用）和平均响应电压表（通常在实验室测试中使用）之间的励磁电压测量差异，并讨论了电源阻抗的影响。 附录C描述了用于继电保护的光学电流传感器系统的特性和其他相关信息。它概述了光学传感器系统中使用的组件，讨论了与传统CT的区别，并提供了测试信息。 附录D是本指南的参考书目。

The scope of this guide is to describe field test methods that assure current transformers (CTs) are connected properly, are of marked ratio and polarity, and are in a condition to perform as designed both initially and after being in service for a period of time. Annex A describes wiring integrity checks, the use of test jacks, current-shorting switches, and relay test equipment. Annex B illustrates excitation voltage measurement differences between rms responding voltmeters(commonly used under field conditions) and average responding voltmeters (commonly used in laboratory tests) and also discusses the effect of the source impedance. Annex C describes the characteristics, and other pertinent information, of optical current sensor systems used with protective relaying. It provides an overview of the components used in an optical sensor system, discusses the differences from conventional CTs, and provides testing information. Annex D is the bibliography for this guide.