Thermal behaviour of a transformer mineral oil-tank surface under incipient turn-to-turn short-circuit fault

IF 1.4 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Si Chen, Yingting Luo, Gehao Sheng, Junfei Jiang
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引用次数: 0

Abstract

A slight turn-to-turn short-circuit fault in the incipient stage does not trigger fuse protection, and the regular transmission and transformation functions of the transformer within the power grid are not affected very much by the incipient turn-to-turn short-circuit fault. Therefore, the incipient turn-to-turn short-circuit faults are often undetected, resulting in massive accidents. Incipient turn-to-turn short-circuit faults lead to localized overheating in the transformer, which changes the transformer's oil-tank surface temperature (OTST). A thermal simulation model (TSM) is presented. Based on the TSM, OTST data with different load rates and fault parameters are collected. The steady-state and transient characteristics of OTST are analysed by extracting the OTST feature vector and the temperature difference of specific regions. The results show that the growth of the heat production value of faulty coils causes a rise in the OTST; higher faulty coils' locations lead to wider OTST differences; the temperature difference's area S can follow the incipient short-circuit fault in the first 20 min after it occurs, which is faster than the top oil temperature. This study gives insight into the thermal behaviour of OTST, assisting in fault detection and location at the incipient fault stage.

Abstract Image

变压器矿物油箱表面在初期匝间短路故障下的热特性
初发阶段的轻微匝间短路故障不会触发熔断器保护,初发匝间短路故障对电网内变压器的正常输电和变电功能影响不大。因此,初期匝间短路故障往往不会被发现,从而导致大规模事故。初期匝间短路故障会导致变压器局部过热,从而改变变压器的油箱表面温度(OTST)。本文介绍了一种热模拟模型(TSM)。在 TSM 的基础上,收集了不同负载率和故障参数下的 OTST 数据。通过提取 OTST 特征向量和特定区域的温差,分析了 OTST 的稳态和瞬态特征。结果表明,故障线圈产热值的增长会导致 OTST 上升;故障线圈位置越高,OTST 差值越大;温差区域 S 可以在短路故障发生后的前 20 分钟内跟踪故障萌芽,其速度快于顶层油温。这项研究深入揭示了 OTST 的热行为,有助于在初发故障阶段进行故障检测和定位。
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来源期刊
Iet Science Measurement & Technology
Iet Science Measurement & Technology 工程技术-工程:电子与电气
CiteScore
4.30
自引率
7.10%
发文量
41
审稿时长
7.5 months
期刊介绍: IET Science, Measurement & Technology publishes papers in science, engineering and technology underpinning electronic and electrical engineering, nanotechnology and medical instrumentation.The emphasis of the journal is on theory, simulation methodologies and measurement techniques. The major themes of the journal are: - electromagnetism including electromagnetic theory, computational electromagnetics and EMC - properties and applications of dielectric, magnetic, magneto-optic, piezoelectric materials down to the nanometre scale - measurement and instrumentation including sensors, actuators, medical instrumentation, fundamentals of measurement including measurement standards, uncertainty, dissemination and calibration Applications are welcome for illustrative purposes but the novelty and originality should focus on the proposed new methods.
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