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 Quando o circuito de alta tensão é desconectado, a tensão rompe o ar, produzindo gases livres de alta temperatura e alta condutividade, que aparecem como faíscas instantâneas de alta temperatura, que são arcos. O dano do arco é muito alto: o arco gera alta temperatura, que ablaciona a superfície do contato e queima o arco.

12/12/2024 - Xiamen, China, é o destino de Ma Teng, presidente global da divisão elétrica do Grupo ABB, em sua "primeira viagem de negócios" no novo ano. Em 9 de janeiro de 2024, executivos desta empresa da Fortune 500 fizeram uma viagem especial a Xiamen, vindos da Holanda, e anunciaram que "nos próximos três anos, eles continuarão

12/12/2014 A multinacional Schneider Electric aumentou sua presença na Zona de Alta Tecnologia de Xiamen Torch. Em 26 de abril de 2024, a construção do Parque Industrial de Energia Elétrica de Xiamen Torch (Fase I) começou oficialmente. Após a conclusão do projeto, ele servirá como Parque Industrial da Schneider Electric (Xiamen), criando sua maior base de produção de média tensão no país.

12/12/2024 Em 14 de novembro de 2024, a Hitachi Energy realizou com sucesso a comemoração do 25º aniversário da base de fabricação de interruptores de alta tensão em Xiamen. Cerca de 120 profissionais do setor, nacionais e estrangeiros, foram convidados a participar do evento presencial para testemunhar as conquistas excepcionais da Hitachi Energy High Voltage Switch Co., Ltd. de Xiamen ao longo dos anos.