Assessing the moisture content of oil-impregnated paper bushings with a simple and fast method

IF 1.5 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Electric Power Applications Pub Date : 2023-12-22 DOI:10.1049/elp2.12408

Hossein Taghizade Ansari, Abolfazl Vahedi

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引用次数: 0

Abstract

Power outages can cause harm to both society and individual health. Among the crucial elements of power systems, power transformers play a vital role, and their failures can lead to incidents and disruptions. According to statistics, almost 50% of the explosions and fires in the power transformer are caused by oil-impregnated paper (OIP) bushing failures. Moreover, moisture is a crucial factor that affects the health of OIP bushings, and assessing the moisture level in OIP bushings is vital to guarantee the safety of power systems. While the frequency-domain dielectric spectroscopy (FDS) method has been widely used to assess the moisture content of OIP bushings on-site, it has the disadvantage of requiring a long measurement time. Therefore, a novel technique was proposed in this study that involves measuring the OIP bushing dissipation factor (tanδ) at 1 Hz to estimate the moisture content in a significantly shorter time. Five samples of OIP with various moisture levels have been selected, and an equation based on the OIPs' value of tanδ at 1 Hz was proposed to assess the moisture level of OIP bushings. Furthermore, the validity of the proposed method was successfully verified, proving its precision and time efficiency.

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用简单快速的方法评估油浸纸衬套的含水量

停电会对社会和个人健康造成危害。在电力系统的关键要素中，电力变压器起着至关重要的作用，其故障可能导致事故和中断。据统计，近 50% 的电力变压器爆炸和火灾是由油浸纸（OIP）套管故障引起的。此外，湿度也是影响 OIP 套管健康的关键因素，因此评估 OIP 套管的湿度水平对保证电力系统的安全至关重要。虽然频域介电光谱法（FDS）已被广泛用于现场评估 OIP 衬套的含水量，但其缺点是需要较长的测量时间。因此，本研究提出了一种新技术，即以 1 Hz 频率测量 OIP 衬套耗散因子（tanδ），从而在更短的时间内估算出含水量。研究人员选择了五个不同湿度的 OIP 样品，并根据 OIP 在 1 Hz 频率下的 tanδ 值提出了一个方程，用于评估 OIP 衬套的湿度。此外，还成功验证了所提方法的有效性，证明了其精确性和时间效率。

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来源期刊

Iet Electric Power Applications 工程技术-工程：电子与电气

CiteScore

4.80

自引率

5.90%

发文量

104

审稿时长

3 months

期刊介绍： IET Electric Power Applications publishes papers of a high technical standard with a suitable balance of practice and theory. The scope covers a wide range of applications and apparatus in the power field. In addition to papers focussing on the design and development of electrical equipment, papers relying on analysis are also sought, provided that the arguments are conveyed succinctly and the conclusions are clear. The scope of the journal includes the following: The design and analysis of motors and generators of all sizes Rotating electrical machines Linear machines Actuators Power transformers Railway traction machines and drives Variable speed drives Machines and drives for electrically powered vehicles Industrial and non-industrial applications and processes Current Special Issue. Call for papers: Progress in Electric Machines, Power Converters and their Control for Wave Energy Generation - https://digital-library.theiet.org/files/IET_EPA_CFP_PEMPCCWEG.pdf