Leak Prevention & Detection of MV Gas-Insulated RMU Switchgear

2026-10-12 For SF6-insulated Ring Main Units (RMU) or GIS, the leakage rate requirement depends on whether the gas compartment is classified as a closed pressure system or a sealed pressure system under IEC standards. 1. IEC 62271-1 (General HV Switchgear Standard) IEC 62271-1 defines: Gas system type Maximum SF6 leakage rate Closed pressure system ≤ 0.5% per year Sealed pressure system Typically designed for ≤ 0.1% per year For a closed pressure system, the standard specifies a maximum relative leakage rate of 0.5%/year for SF6 and SF6 mixtures. The time between gas replenishments must be at least 10 years. For a sealed pressure system, IEC does not directly state a fixed maximum percentage, but notes […]

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Why Do Some Switchgear Have One CT While Others Have Three?

2026-10-12 Current transformers are widely used in power systems; their function is to induce a small current—proportional to the current flowing through a high-current cable—for use in metering and relay protection. What is the function of a current transformer? To ensure the safe and economical operation of a power system, it is essential to monitor and measure the operating status of power equipment. However, standard measuring and protection devices cannot be directly connected to high-voltage primary equipment; instead, the high current from the primary system must be proportionally transformed into a lower current suitable for use by these instruments and devices. When measuring high alternating currents, conversion to a standardized

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Main Structure of Our New Production Building Successfully Topped Out

2026-10-12 On October 11, 2026, the main structure of our new production building was successfully topped out, marking a major milestone in the project’s construction. This achievement lays a solid foundation for the remaining construction work and the building’s completion and commissioning. With the main structure now complete, the project will move on to the next phases, including exterior and interior finishing works and the installation of rooftop solar photovoltaic panels. Construction is progressing steadily and according to schedule. Designed in line with modern industrial building requirements, the new facility incorporates comprehensive planning in areas such as space utilization, structural load-bearing capacity, fire safety, and supporting facilities. It is intended

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Strengthening Global Partnerships Advancing SF6-Free Solutions at Hannover Messe 2026

2026-04-24 From April 20 to 24, 2026, we proudly exhibited at Hannover Messe 2026 in Germany, marking our third consecutive year at this premier global industrial event. Throughout the exhibition, we had the pleasure of reconnecting with our long-standing partners, further deepening our cooperation and mutual trust. We also engaged in detailed and constructive discussions with previously established prospective clients, successfully advancing several key projects toward implementation. In addition, our booth welcomed a significant number of new visitors from diverse international markets, highlighting growing global interest in our solutions. A major focus of this year’s exhibition was the accelerating transition toward SF6-free technologies. Driven by the European Union’s updated greenhouse

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Necessity of Short-Circuit Making Capability for Earthing Switches in MV RMUs

2026-01-05 Functional Role of the Earthing Switch In medium-voltage ring main units (RMUs), the earthing switch (ES) is often regarded as a device intended solely for maintenance grounding. However, under several credible operating and fault conditions, the earthing switch may be required to make onto a live circuit and withstand the resulting short-circuit current. For this reason, IEC standards explicitly require earthing switches to be designed and tested for short-circuit making capability, rather than treating this as an optional feature. Typical Operating Scenarios Requiring Short-Circuit Making Capability 2.1 Inadvertent Closing onto an Energized Circuit In the event of mis-operation or interlocking failure, an earthing switch may be closed onto an energized

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Our Company Held 2026 New Year Team-Building Gala

2026-01-05 On December 31, 2025, our company held the 2026 New Year Team-Building Gala, bringing together all employees to celebrate the arrival of the New Year and reflect on the achievements of the past year. During the event, company leaders extended their New Year greetings to all staff and expressed sincere appreciation for the dedication and hard work demonstrated throughout 2025. They encouraged everyone to maintain a strong sense of responsibility and teamwork in the year ahead, and to continue contributing to the company’s steady and sustainable development. The New Year dinner and a series of team-building activities created a relaxed and positive atmosphere, providing employees with an opportunity to

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Good News! Our 24kV and 38kV Permanent Magnetic Auto Reclosers Passed the Full Tests at XIHARI

2025-12-16 Recently, our company’s independently developed 24kV and 38kV permanent magnetic auto reclosers successfully completed all project tests at the Xi’an High Voltage Apparatus Research Institute (XIHARI). ◆ The 24kV/16kA permanent magnet drive recloser passed the T100 test according to IEC 62271-111.7.103, with the rated operating sequence being O-0.1s-CO-1s-CO-1s-CO-60s-CO, and passed all three tests successfully. ◆ The 38kV/16kA permanent magnet drive recloser passed the T100 test according to IEC 62271-111.7.103, with the rated operating sequence being O-0.2s-CO-3s-CO-3s-CO-lockdown, and passed all three tests successfully. This marks a key breakthrough for our company in the field of permanent magnet drive technology innovation and application, and lays a solid foundation for future entry into the international high-end

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当社はコスト効率の高い屋外RMUの開発に成功しました

2024-05-30 海外の新規顧客の要望にお応えし、当社は屋内外兼用で使用できる経済的なリング型メインユニットの開発に成功しました。試験の結果、機械的特性と各種電気指標はすべてお客様のご要望を満たしており、開発スピードと総合的な性能にお客様から大変ご満足いただいております。この経済的なリング型メインユニットは、キャビネット単体での出荷、またはガスタンクと機構部のみの供給も可能です。海外のお客様は、シェルを自ら設置したり、海外で膨らませたりすることで、現地の製造ニーズに対応できます。詳細は、以下のリンクをご覧ください:http://www.xminsulation.com/product/10-24kv-outdoor-gis-switchgear-ring-main-unit-rmu/

当社はコスト効率の高い屋外RMUの開発に成功しました 続きを読む "

中国の超高圧の過去と現在を独占公開(前半)

2024-05-20 世界に「標準なし、経験なし、設備なし」という状況下で、中国の超高圧送電網は「ゼロからのスタート」から「設備重視の大国」、「中国創発」から「中国主導」、「設備は中国」から「設備は世界」へと大きく変貌を遂げました。超高圧送電網の建設は、わが国の電力発展の歴史において、最も困難で、最も革新的で、最も挑戦的な成果と言えるでしょう。これは、中国と世界の電力産業の発展における重要な節目でもあります。カーボンピーキングとカーボンニュートラルという文脈において、超高圧送電網は中国のエネルギーの

中国の超高圧の過去と現在を独占公開(前半) 続きを読む "

中国の超高圧の過去と現在を独占公開(後半)

2024-05-29 電力の「エベレスト」を征服し、UHVは中国では「ゼロからのスタート」です。2004年以来、中国国家電網公司は数十の科学研究機関と大学、200社以上の設備製造会社、500以上の建設ユニット、数十万人の人々を組織し、UHVの基礎研究、技術研究開発、設備開発、システム設計、テスト検証、エンジニアリング建設、試運転と運用の作業で310の重要な技術を克服し、過電圧と絶縁調整、電磁環境制御、UHV ACとDCのハイブリッド電力網の安全制御など、世界クラスの問題を解決しました。電力網が安全であるかどうかを判断するために、

中国の超高圧の過去と現在を独占公開(後半) 続きを読む "