This standard specifies the classification principles, technical requirements, and test methods for phase difference high-frequency protection devices. This standard is applicable to phase difference high-frequency protection devices (hereinafter referred to as devices). This device is suitable for high-voltage transmission lines of 110-220kV and above as the main protection, protecting the safe and reliable operation of the power system. This standard only applies to new devices. This standard is not applicable to other types of high-frequency protection devices. The provisions contained in the following standards are incorporated into this standard by reference. At the time of publication of the standard, all versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 1.3-1997 Standardization of Chemical Industry - Guidelines for Work - Unit 1: Rules for Drafting and Expressing Standards - Part 3: Product Standard Writing Regulations - GB/T 2900.1-1992 Basic Terminology of Electrical Terminology - GB/T 2900.17-1994 Electrical Terminology: Electrical Relays - GB/T 2900.49-1994 Electrical Terminology - Power System Protection - GB/T 7261-1987 Basic Test Methods for Relays and Relay Protection Devices - GB/T 14598,3-1993 Electrical Relays - Part 5: Insulation Testing of Electrical Relays - JB/T 425 9-1996 Technical requirements for tropical measuring relays and protection devices
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