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 […]

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

2026-06-10 I.Medium-voltage circuit breakers mainly consist of the circuit breaker body and the operating mechanism. With continuous technological updates to circuit breakers, the possibility of failure in the circuit breaker body is decreasing, and circuit breaker failures are concentrated in the operating mechanism. According to statistics on medium-voltage circuit breaker operation failures, among various circuit breaker failures, operating mechanism failures are the most frequent, accounting for approximately 70-80% of circuit breaker failures. Composition of Medium Voltage Circuit Breakers Normally, the operating mechanism operates statically, making it impossible to monitor the status of its components and detect potential problems in a timely manner until the fault is discovered during operation. Therefore,

2026-06-10 The “opening and closing coil” of a high-voltage circuit breaker is an important component of the circuit breaker’s electric operating mechanism. It is a hollow cylindrical coil wound with copper wire, possessing excellent conductivity. When current passes through the coil, it generates a magnetic field, which, through electromagnetic force, drives the positioning pins of the circuit breaker’s opening and closing springs to perform opening and closing operations. In layman’s terms, “closing coil” refers to “closing electromagnet”. So why do ring main units often burn out “closing coils”? I.The core reason why the closing and tripping coils of ring main units frequently burn out is that the coil is energized

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

2025-04-15 According to the newly revised “Preventive Test Procedures for Power Equipment”, the moisture content of SF6 switches for newly commissioned and overhauled arc extinguishing compartments shall not exceed 150ppm, and shall not exceed 300ppm during operation. As for the harm of micro-water, the reason is obvious and will not be explained here. We mainly explain how to reduce micro-water and meet the micro-water factory test standard. We must first understand where the moisture comes from? The equipment may be exposed to moisture during manufacturing, transportation, installation, and maintenance; The insulation parts of the equipment contain a small amount of moisture; The adsorbent itself contains moisture; The gas contains moisture;

2024-12-12 高電圧回路が切断されると、電圧によって空気が分解され、高温で高伝導性の自由ガスが発生します。この自由ガスは瞬間的に高温の火花、つまりアークとして現れます。アークの損傷は非常に大きく、アークは高温を発生させ、接点表面をアブレーションし、絶縁材料を焼損させます。元々切断されていた2つの接点は、アークの存在によって電流を形成し、スイッチが回路を切断するまでの時間を延長し、電力システムの短絡故障による損傷を悪化させます。アークは火災や爆発を引き起こす可能性があります。そのため、アークの消火は重要なリンクとなっています。

2024年12月12日、ABBグループの電気事業部門のグローバルプレジデントである馬騰氏は、新年の「初出張」として中国・厦門を訪れた。2024年1月9日、フォーチュン500企業の幹部らがオランダから厦門を訪れ、「今後3年間で中国への投資を1兆4千億米ドル増やす」と発表した。馬騰氏は厦門で開催された2024 ABB電気イノベーションウィークにも出席した。ABBのパートナーらと共に、世界初のIEC60947-2規格に準拠したソリッドステート遮断器など、ABBの一連のイノベーションの発表を目撃した。

2014年12月12日、多国籍企業シュナイダーエレクトリックは、厦門トーチハイテクゾーンでの存在感を高めました。2024年4月26日、厦門トーチ電力産業パーク（フェーズI）プロジェクトが正式に着工しました。プロジェクト完了後は、シュナイダーエレクトリック（厦門）産業パークとなり、世界最大の中電圧生産拠点となります。厦門トーチ電力産業パーク（フェーズI）プロジェクトは、トーチ（仙安）工業区に位置し、トーチグループが投資・建設しています。プロジェクトには、主にR＆Dオフィスビル1棟とカスタマイズ工場ビル1棟が含まれ、総建築面積は約11万平方メートル、総投資額は約1000万ドルです。

2024-12-12 2024年11月14日、日立エネルギーは厦門で高圧スイッチ製造拠点の25周年記念式典を成功裏に開催しました。国内外から約120名の業界関係者が招待され、過去25年間の厦門日立エネルギー高圧スイッチ株式会社の優れた成果を目の当たりにするため、現地イベントに出席しました。未来志向で環境に優しく、信頼性の高いGIS技術の開発と展開について深く議論されました。記者は、日立エネルギーが1999年に厦門経済特区に世界的に重要なガス絶縁密閉型電気機器（GIS）とガス絶縁金属密閉回路（GIL）の製造拠点を設立したことを知りました。これまで、その深い