基于MATLAB的35kV线路继电保护设计与仿真摘 要本文围绕基于MATLAB的35kV线路继电保护设计与仿真展开研究旨在为35kV辐射状供电线路构建一套完备且可靠的继电保护体系。针对具体35kV辐射状供电线路首先系统收集电源阻抗、线路单位长度参数等关键系统参数并完成开题报告明确研究方向与基础。在整定计算与建模阶段依据选择性、速动性等原则完成电流Ⅰ段速断、Ⅱ段限时速断及Ⅲ段过电流保护的整定计算且灵敏度校验满足要求灵敏度系数≥1.3利用MATLAB/Simulink搭建涵盖电源、线路、可变故障模块的系统模型可灵活模拟不同位置的三相短路与两相短路情况。保护逻辑实现与仿真环节在模型中集成三段式电流保护逻辑仿真验证各段保护动作及动作时间获取清晰的故障电流波形与保护动作时序图动作时间误差控制在±10%以内。优化分析阶段对仿真与整定时间误差控制在±10%内进行分析探讨保护配置优缺点并提出改进方向。通过本研究完成了包含完整整定计算书和仿真分析的设计报告为35kV线路继电保护的实际应用提供了理论支持与技术参考。关键词35kV线路MATLAB/Simulink三段式电流保护整定计算仿真分析AbstractThis paper focuses on the design and simulation of 35kV line relay protection based on MATLAB, aiming to establish a complete and reliable relay protection system for 35kV radial power supply lines. For a specific 35kV radial power supply line, key system parameters such as power supply impedance and line unit length parameters are systematically collected first, and an opening report is completed to clarify the research direction and foundation.During the setting calculation and modeling stage, in accordance with the principles of selectivity and quick-action, etc., the setting calculations for current protection segment Ⅰ (instantaneous trip), segment Ⅱ (time-delay instantaneous trip), and segment Ⅲ (overcurrent) are accomplished, and the sensitivity checks meet the requirements (sensitivity coefficient ≥ 1.3). A system model incorporating power supplies, lines, and variable fault modules is built using MATLAB/Simulink, enabling flexible simulation of three-phase short circuits and two-phase short circuits at different locations.In the phase of protection logic implementation and simulation, the three-segment current protection logic is integrated into the model, and the actions and operating times of each protection segment are verified through simulation. Clear fault current waveforms and protection action sequence diagrams are obtained, with action time errors controlled within ±10%. During the optimization analysis stage, the errors between simulation and setting times (controlled within ±10%) are analyzed, and the advantages and disadvantages of the protection configuration are discussed, with improvement directions proposed.Through this research, a design report encompassing a complete setting calculation book and simulation analysis is completed, providing theoretical support and technical reference for the practical application of 35kV line relay protection.Keywords: 35kV line; MATLAB/Simulink; three-segment current protection; setting calculation; simulation analysis目录基于MATLAB的35kV线路继电保护设计与仿真 1摘 要 1Abstract 235kV线路保护配置方案 51.1. 引言 51.2. 配置的基本原则 5线路保护影响因素 51.3. 继电保护装置的任务1 6初级保护的确定时延水平 71.4. 继电保护的基本要求 8保护继电器的基本要求 9速度 10敏感 11可靠性 11简单性 11经济 111.5. 主保护和后备保护 11主要保护 112.1. 常见故障分析 13台风因素 13雷电因素 13覆冰因素 13肮脏因素 13外部损伤系数 13保护策略 14防雷措施 14塔的位置和杆的正确选择 14防止污闪 14防止外部损坏 14建议采取以下方法可以预防本文中提到的问题 153.1. 基本配置和规格 18输电线路过载保护 182.不同类型故障的故障电流不同继电器整定有一定难度。 20输电线路差动引线保护 213.2. 设备原理 32保护短路电流和负载电流的计算 334.1. 运行模式下最大短路电流的计算 33短路现象介绍 334.2. 软件分析 444.3. 最大负载电流计算 4635kV线路保护整定计算 495.1. 输入电路 492 x IMax负载IPickup1/3 x IMax故障 51当前分级 56反时限过电流继电器 56C.T.S.14A 601处故障的短路是2处C.T.S.的倍数 61T.D.S.2 2≈ 61T.D.S.3 2.5 ≈ 62总结 63致谢 64参考文献 65