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Insulation structure of oil-immersed transformers

2025/12/23

Insulation structure of oil-immersed transformers

Transformer insulation can be divided into internal and external insulation, internal insulation refers to all parts of the tank insulation, external insulation refers to the upper part of the casing to the ground and the insulation between them. Internal insulation can be divided into two parts: main insulation and longitudinal insulation.

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Breakthrough! World-first ±1,100 kV live-line work carried out in Anhui

2025/10/28

Breakthrough! World-first ±1,100 kV live-line work carried out in Anhui

On October 31, State Grid Anhui Electric Power employees successfully completed live-line work on a ±1100 kV ultra-high-voltage transmission line at an altitude of 111 meters in Nangang Town, Shucheng County, Lu'an City, Anhui Province. This milestone marks the official entry of live-line operations into the ±1100 kV domain.

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Henan Wanjin Honored as Municipal-Level Transformer R&D Center and Key Laboratory

2025/09/26

Henan Wanjin Honored as Municipal-Level Transformer R&D Center and Key Laboratory

Notice on Approving the Establishment of Municipal Engineering Technology Research Centers, Key Laboratories, and Off-site R&D Institutions by 94 Entities, Including Nanyang Tongkai Biotechnology Co., Ltd. To the Science and Technology Administration Departments of All Counties (Districts) and Relevant Organizations:

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The wind power industry is riding the "wind" of growth: Affordable grid parity is just around the corner, driving steady industry expansion.

2025/09/26

The wind power industry is riding the "wind" of growth: Affordable grid parity is just around the corner, driving steady industry expansion.

Recently, Fujian's first 220kV offshore booster substation "settled" at the Three Gorges Group's Fuzhou Xinghua Bay Offshore Wind Farm. The photo shows China's first SVG dynamic reactive power compensation system installed atop an offshore booster station—also currently the most highly integrated and one of the largest and heaviest offshore substations in the country.

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Henan Provincial Administration for Market Regulation randomly inspected 102 batches of low-voltage switchgear and control equipment products, and all of them passed inspection.

2025/09/26

Henan Provincial Administration for Market Regulation randomly inspected 102 batches of low-voltage switchgear and control equipment products, and all of them passed inspection.

China Quality News reported that recently, the Henan Provincial Administration for Market Regulation announced the results of its special supervision and random inspection of low-voltage complete switchgear and control equipment products—part of a comprehensive initiative to address electrical fire risks in the production and processing sector—for the first batch of 2019. This targeted inspection covered 104 enterprises, though six companies were not sampled due to production or business shutdowns. In total, samples were collected from 98 enterprises producing 102 batches of low-voltage complete switchgear and control equipment across 18 prefecture-level cities—including Zhengzhou, Kaifeng, Luoyang, Pingdingshan, Anyang, Hebi, Xinxiang, Jiaozuo, Puyang, and Xuchang—as well as from two county-level cities directly managed by the province: Lankao and Gongyi. Testing revealed that all 102 batches of products fully met the relevant standard requirements.

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Skills Light Up Life: The First "Schneider Electric Cup" Electrical Installation Application Technology Competition Successfully Held

2025/09/26

Skills Light Up Life: The First "Schneider Electric Cup" Electrical Installation Application Technology Competition Successfully Held

Beijing, China – November 4, 2019: The "Schneider Electric Cup" Electrical Installation Application Technology Competition of the 2019 National Vocational Education Skills Contest for the Machinery Industry successfully took place at Nanjing Technician College on November 2–3. The event drew 52 student teams representing 32 vocational colleges from across the country. Among them, four teams from Nanjing Technician College and Kaifeng Technician College clinched first place in the secondary vocational group, while one team from Xinxiang Technician College claimed the top honor in the higher vocational category.

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Henan Wanjin Electrical Equipment Co., Ltd.
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Henan Wanjin Electrical Equipment Co., Ltd.

Phone:+86-377-62178288

E-mail:hnwjdianqi@163.com

Address: Nanyang New Energy Technology Entrepreneurship Park, Songshan Road, Wancheng District, Nanyang City, Henan Province

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