T/CEPPC 57-2025 Guide for the protective relaying configuration of generator-transformer unit in nuclear power plant

Scope

This document stipulates the guiding principles for the design, technical modification, and operation of relay protection systems for generator transformer units (hereinafter referred to as "generator-transformer units") in nuclear power plants. This document applies to relay protection devices for generator-transformer units in pressurized water reactor nuclear power plants with a unit wiring configuration, including: generator protection devices, main transformer protection devices, high-voltage auxiliary transformer protection devices, and excitation transformer protection devices. Preface II 1 Scope 1 2 Normative Reference Documents 1 3 Terms and Definitions 1 4 Principles of Protection Configuration 1 Appendix A (Informative Appendix) Schematic Diagram of Triple Protection Logic for Generator-Transformer Units 10 Appendix B (Informative Appendix) Permissible Current Values for Single-Phase Grounding Faults in the Stator Winding of a Turbine Generator 11 References 12

Development Information

Related Standards