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 […]

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

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

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

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

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

2024-12-12 Ketika rangkaian tegangan tinggi terputus, tegangan akan memecah udara untuk menghasilkan gas bebas suhu tinggi dan konduktivitas tinggi, yang muncul sebagai percikan suhu tinggi seketika, yang merupakan busur. Kerusakan busur sangat tinggi: busur akan menghasilkan suhu tinggi, yang akan mengikis permukaan kontak dan membakar

2024-12-12 Xiamen, Tiongkok, menjadi tujuan Ma Teng, presiden global bisnis kelistrikan Grup ABB, sebagai “perjalanan bisnis pertamanya” di tahun baru. Pada 9 Januari 2024, para eksekutif perusahaan Fortune 500 ini melakukan perjalanan khusus ke Xiamen dari Belanda dan mengumumkan bahwa “dalam tiga tahun ke depan, mereka akan lebih jauh

2014-12-12 Perusahaan multinasional Schneider Electric telah meningkatkan kehadirannya di Xiamen Torch High-tech Zone. Pada tanggal 26 April 2024, proyek Xiamen Torch Electric Power Industrial Park (Fase I) secara resmi memulai konstruksi. Setelah proyek selesai, proyek ini akan berfungsi sebagai Schneider Electric (Xiamen) Industrial Park, menciptakan basis produksi tegangan menengah terbesarnya di

2024-12-12 Pada tanggal 14 November 2024, Hitachi Energy berhasil menyelenggarakan perayaan ulang tahun ke-25 pangkalan manufaktur sakelar tegangan tinggi di Xiamen. Sebanyak sekitar 120 orang dalam industri dari dalam dan luar negeri diundang untuk menghadiri acara di tempat untuk menyaksikan pencapaian luar biasa Xiamen Hitachi Energy High Voltage Switch Co., Ltd. selama bertahun-tahun.