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

12/12/2024 Al desconectar el circuito de alta tensión, la tensión descompone el aire para producir gases libres de alta temperatura y alta conductividad, que aparecen como chispas instantáneas de alta temperatura, que son arcos eléctricos. El daño causado por el arco es muy alto: el arco genera alta temperatura, lo que desgasta la superficie del contacto y lo quema.

12/12/2024 Xiamen, China, es el destino de Ma Teng, presidente global del negocio eléctrico del Grupo ABB, en su "primer viaje de negocios" del nuevo año. El 9 de enero de 2024, ejecutivos de esta empresa de la lista Fortune 500 realizaron un viaje especial a Xiamen desde los Países Bajos y anunciaron que "en los próximos tres años, seguirán...

12/12/2014. La multinacional Schneider Electric ha aumentado su presencia en la Zona de Alta Tecnología Xiamen Torch. El 26 de abril de 2024, se inició oficialmente la construcción del Parque Industrial de Energía Eléctrica Xiamen Torch (Fase I). Una vez finalizado el proyecto, servirá como Parque Industrial Schneider Electric (Xiamen), creando así su mayor base de producción de media tensión en el país.

12/12/2024 El 14 de noviembre de 2024, Hitachi Energy celebró con éxito el 25.º aniversario de la planta de fabricación de interruptores de alto voltaje en Xiamen. Cerca de 120 expertos de la industria, tanto nacionales como internacionales, fueron invitados al evento presencial para presenciar los destacados logros de Xiamen Hitachi Energy High Voltage Switch Co., Ltd.