Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The relationship between the temperature-rise current of a 145 kV disconnector and copper conductor size lies in balancing current-carrying capacity and heat dissipation efficiency. The temperature-rise current refers to the maximum continuous current a conductor can carry without exceeding its specified temperature rise limit, and the copper conductor size directly influences this parameter.Understanding this relationship begins with the physical properties of the conductor material. Copper’s c

Brand Core Business Tavrida Electric Specializes in reclosers and other transmission & distribution equipment, with a strong focus on the R&D and manufacturing of high-voltage switching devices. Its Tavrida OSM recloser stands out in the industry, delivering reliable distribution solutions for power systems. NOJA Power Focuses on intelligent reclosers and related distribution equipment. The company’s advanced NOJA OSM recloser technology targets smart grid applica

Currently, traditional-type breathers are widely used in transformers. The moisture-absorbing capability of silica gel is still judged by operation and maintenance personnel through visual observation of the color change of silica gel beads. Subjective judgment by personnel plays a decisive role. Although it has been clearly stipulated that silica gel in transformer breathers should be replaced when more than two-thirds of it changes color, there is still no accurate quantitative method to deter

With the advancement of smart grid technologies, sequential control (SCADA-based automated switching) in substations has become a core technique for ensuring stable power system operation. Although existing sequential control technologies have been widely deployed, challenges related to system stability under complex operating conditions and equipment interoperability remain significant. Unmanned Aerial Vehicle (UAV) technology—characterized by its agility, mobility, and non-contact inspection c

Intelligentization has become an important development direction for power systems. As a critical component of the power system, the stability and safety of 10 kV distribution network lines are vital to the overall operation of the power grid. The fully enclosed disconnector, as one of the key devices in distribution networks, plays a significant role; thus, achieving its intelligent control and optimized design is of great importance for enhancing the performance of distribution lines.This pape

1.Analysis of the Structure and Working Principle of GN30 DisconnectorThe GN30 disconnector is a high-voltage switching device primarily used in indoor power systems to open and close circuits under voltage but no-load conditions. It is suitable for power systems with a rated voltage of 12 kV and AC frequency of 50 Hz or lower. The GN30 disconnector can be used either in conjunction with high-voltage switchgear or as a standalone unit. Featuring a compact structure, simple operation, and high re

1.Working Principle and Structural Features of GW4-126 DisconnectorThe GW4-126 disconnector is suitable for AC 50/60 Hz power lines with a rated voltage of 110 kV. It is used to disconnect or connect high-voltage circuits under no-load conditions, enabling circuit switching, operational mode changes, and safe electrical isolation of busbars, circuit breakers, and other high-voltage equipment during maintenance. Disconnectors typically feature a clearly visible open point to ensure safe current i

1.Description of the Fault PhenomenonThe disconnector fault in a 550 kV GIS equipment occurred at 13:25 on August 15, 2024, while the equipment was operating under full load with a load current of 2500 A. At the moment of failure, the associated protection devices acted promptly, tripping the corresponding circuit breaker and isolating the faulty line. System operating parameters changed significantly: the line current dropped abruptly from 2500 A to 0 A, and the bus voltage instantly decreased

Famous Brands in Power Equipment and Complete Electrical Systems (Technology & Equipment Sector) Ranking Brand Country Core Advantages 1 Siemens Energy Germany Gas turbines, offshore wind power, HVDC transmission, smart grid 2 GE Vernova United States Gas/steam turbines, renewable energy, grid digitalization 3 Hitachi Energy Switzerland (Former ABB Grid) Ultra-high voltage transformers, HVDC, energy storage systems 4 Schneider Electric

Impact of GIS Disconnector Operations on Secondary Equipment and Mitigation Measures1.Impacts of GIS Disconnector Operations on Secondary Equipment 1.1Transient Overvoltage Effects During opening/closing operations of Gas-Insulated Switchgear (GIS) disconnectors, repeated arc reignition and extinction between contacts cause energy exchange between system inductance and capacitance, generating switching overvoltages with magnitudes 2–4 times the rated phase voltage and durations ranging from tens