摘要
本文深入探讨了内桥接线方式下主变差动保护存在的死区问题。首先，通过深入的理论分析，明确了死区问题的根本成因，即电流互感器（CT）的安装位置与断路器之间的保护盲点，这一盲点可能导致保护系统在某些故障场景下无法及时动作。本文详细分析了内桥接线方式下主变差动保护死区故障的具体发生场景，并指出了这些故障可能导致的严重后果，如设备损坏、供电中断甚至经济损失等。这些分析为理解死区问题的严重性和紧迫性提供了重要依据。针对上述问题，本文提出了一系列有效的优化策略。这些策略包括优化CT的安装位置和配置，确保保护系统能够全面覆盖潜在的故障区域；引入智能监测与诊断技术，实现对主变差动保护的实时监控和故障预警；实施预防性和预测性维护，降低运维难度并减少经济损失。通过具体案例分析，本文验证了所提优化策略的有效性和可行性，为内桥接线方式下主变差动保护的改进提供了有力的实践指导。最后，本文还展望了未来在智能电网背景下，如何进一步利用先进技术解决主变差动保护死区问题，以提升电网的供电可靠性和经济性。
关键词：内桥接线；主变差动保护；死区问题
Abstract
This paper discusses the problem of main transformer differential protection under the connection mode of internal bridge. First of all, through in-depth theoretical analysis, the root cause of the dead area problem is clarified, that is, the protection blind spot between the installation position of the current transformer (CT) and the circuit breaker. This blind spot may cause the failure of the protection system to act in time in some fault scenarios. This paper analyzes in detail the specific scenarios of the main transformer, and points out the serious consequences, such as equipment damage, power supply interruption and even economic loss. These analyses provide an important basis for understanding the seriousness and urgency of dead zone problems. To address the above problems, this paper proposes a series of effective optimization strategies. These strategies include optimizing the installation location and configuration of CT to ensure that the protection system fully covers potential fault areas; introducing intelligent monitoring and diagnosis technology to realize real-time monitoring and fault warning of the main variable differential protection; and implementing preventive and predictive maintenance to reduce the difficulty of operation and maintenance and reduce economic losses. Through specific case analysis, this paper verifies the effectiveness and feasibility of the proposed optimization strategy, and provides a powerful practical guidance for the improvement of the main variable differential protection under the inner bridge connection mode. Finally, this paper also looks into how to further use advanced technology to solve the problem of differential protection zone in the background of smart grid, so as to improve the reliability and economy of power grid.
Keywords：Inner bridge wiring; differential protection of main transformer; dead area problem
目 录
摘要 I
Abstract II
一、绪论 1
（一）研究背景及意义 1
（二）研究目的和内容 1
（三）国内外研究现状 2
二、内桥接线方式概述 3
（一）内桥接线方式的基本定义 3
（二）内桥接线方式的运行原理 3
（三）内桥接线方式的主要技术特点 3
三、主变差动保护相关概述 5
（一）主变差动保护的定义 5
（二）主变差动保护的基本原理 5
（三）主变差动保护的技术要求 5
四、内桥接线方式下的主变差动保护死区问题分析 7
（一）安全隐患 7
（二）供电可靠性下降 7
（三）运维困难 7
（四）经济损失 8
五、主变差动保护死区问题的优化策略 9
（一）优化电流互感器安装位置 9
（二）精确安装CT 9
（三）引入智能保护与监控系统 10
（四）实施预防性维护 10
结 论 11
参考文献 12
