【正文】 ls, while testing the professional learning outes. First, according to the requirements of graduation, to establish a rational system, this graduation design to the proposed 110KV transformer substation as an example. Secondly, according to the main content of graduation, on the 110KV power system relay protection, relay protection according the principle of conservation of the chosen sensitivity setting and checking, determine the protection program. The graduation project is divided into six chapters, the first chapter describes an overview of power system protection, including the brief history of relay protection, relay protection, the role of the basic requirements of relay protection, relay protection of the basic principles of position and classification, a brief description of the basic situation of the power system protection。 The third chapter is the system shortcircuit current calculation, including the concept of shortcircuit current, type of short circuit current purposes of the calculation and short circuit current per unit value calculation method。 Chapter transformer protection, including the principle of transformer protection, protection setting calculations and the sensitivity of school experience, the main protection is used in differential protection and gas protection, bination of the two do plement each other, backup protection is a plex voltage start overcurrent protection. Chapter VI of the bus protection, including the principles of bus protection, protection setting calculations and the sensitivity check, the system mainly uses a fully differential current protection, simple and reliable. KEY WORDS: shortcircuit current, setting calculation, sensitivity, relay protection 目 錄 第 1章 電力系統(tǒng)繼電保護概述 ................................................ 1 繼電保護發(fā)展簡史 .................................................... 1 繼電保護發(fā)展現(xiàn)狀 ............................................. 1 繼電保護的未來發(fā)展 ........................................... 1 繼電保護的作用 ...................................................... 1 對電力系統(tǒng)繼電保護的基本要求 ........................................ 2 繼電保護的基本原理、構(gòu)成與分類 ...................................... 4 基本原理 ..................................................... 4 構(gòu)成 ......................................................... 7 分類 ......................................................... 8 第 2章 變電站分析 ......................................................... 9 變電站的負荷分析 .................................................... 9 主變壓器 .......................................................... 10 主變臺數(shù)和容量計算 .......................................... 10 繞組數(shù)和繞組連接方式的選擇 .................................. 12 主變壓器的冷卻方式 .......................................... 12 電氣主接線 ......................................................... 13 電氣主接線的設計要求 ........................................ 13 電氣主接線形式的確定 ........................................ 14 第 3章 短路電流計算 ...................................................... 16 短路的概念及短路電流的種類 ........................................ 16 短路的概念 .................................................. 16 短路電流的暫態(tài)過程和短路電流種類 ............................. 16 短路電流的標幺值計算法 ............................................. 17 短路電流的簡化計算 ................................................. 18 在最大運行方式下的短路電流 ......................................... 18 第 4章 線路保護 .......................................................... 26 單測電源網(wǎng)絡相間短路的電流保護 ..................................... 26 電流速斷保護（第Ⅰ段） ...................................... 26 整定值計算及靈敏性校驗 ...................................... 27 限時電流速斷保護（第Ⅱ段） .................................. 27 定時限過電流保護（第Ⅲ段） .................................. 28 線路末端短路電流 .................................................. 30 線路保護整定 ...................................................... 31 35kv側(cè)線路保護整定 .......................................... 31 10kv側(cè)線路保護整定 .......................................... 31 第 5章 變壓器保護 ........................................................ 32 電力變壓器保護的重要性 ............................................. 32 電力變壓器的故障類型和不正常工作狀態(tài) ............................... 32 變壓器的故障類型 ............................................ 32 變壓器的不正常工作狀態(tài) ...................................... 32 變壓器保護的配置原則 ............................................... 33 變壓器瓦斯保護的基本原理及整定 ..................................... 34 瓦斯繼電器的基本原理 ........................................ 34 瓦斯保護的整定 .............................................. 35 變壓器縱聯(lián)差動保護 ................................................. 35 構(gòu)成變壓器縱差動保護的基本原則 ............................... 35 變壓器差動保護的不平衡電流 .................................. 38 變壓器過負荷保護 ................................................... 39 變壓器過流保護 ..................................................... 39 變壓器零序電流保護 ................................................. 40 變壓器保護的整定計算 ............................................... 41 縱聯(lián)差動保護的整定計算 ...................................... 41 過流保護的整定計算 .......................................... 47 第 6章 母線保護 .......................................................... 50 母線故障和母線保護的重要性 ......................................... 50 母線保護基本原則 ................................................... 50 母線保護的配置原則 ................................................. 51 母線的完全差動保護 ................................................. 52 母線保護整定計算 ................................................... 52 總結(jié)與體會 ................................................................ 54 致 謝 .................................................................. 55 參考文獻 .............................