用数学计算模式检验差动保护比率制动特性及小负荷下差动保护接线的正确性用数学计算模式检验差动保护比率制动特性及小负荷下差动保护接线的正确性 摘要:由于电网日益进展的需要特别是近年来的农网改造,系统中采纳的变压器保护装置多样化,而各个厂家保护装置设置不尽相同,给保护装置定值整定带来一定困难,所以要求试验能更真实的反映运行实际情况。本文通过数学模型计算,模拟实际接线来检验Y/Δ-11 变压器差动保护比率制动特性,从而检查保护装置参数设置是否合理。同时通过数学模型计算还可明确推断小负荷下差动保护接线是否正确。 关键词:数学计算;检验; 比率制动;小负荷下的差流 Abstract: due to the needs of the development of power grid becomes more and more especially in recent years, the rural electric reform system used in transformer protection device is diverse, and each manufacturer different protective device Settings, to protection fixed value setting bring certain difficulties, so request test can run more real reflect the actual situation. By mathematical model calculation, this paper simulated the actual wiring to test Y/Δ - 11 transformer differential protection of ratio braking characteristics, so as to check the protection device parameter setting is reasonable. By mathematical model calculation at the same time also can clear judgment under small load differential protection wiring is correct. Key words: mathematical calculation; Inspection; Ratio of the brake; Poor under the small load flow. 中图分类号:V242.3 文献标识码:A 文章编号:2095-2104(2025) 1、引言 差动保护是大型油浸变压器、发电机和电动机的主保护之一。是主设备绕组及引出线的相间、绕组匝间短路以及中性点直接接地系统侧绕组和引出线接地短路时的重要保护。为了在变压器、发电机内部故障时有较高的动作灵敏性,而在区外故障时差动保护有可靠的制动作用。常规的差动保护都配置有比率制动元件。所以在保护装置检验特别是在新设备交接试验时如何验证差动保护比率制动特性是否满足技术要求就至关重要。对于比率制动特性的检验,...