Circuit breaker operating mechanism is the core component of high-voltage switchgear, which is mainly divided into four categories: spring operating mechanism, hydraulic operating mechanism, pneumatic operating mechanism and electromagnetic operating mechanism. Among them, spring operating mechanism occupies a dominant position in medium and high voltage field due to its advantages of high reliability and easy maintenance.
Features of spring-operated mechanism
Energy storage: mechanical spring (usually coil spring or disc spring) energy storage, energy storage through the motor or manually.
Energy release: fast and stable release speed, not affected by ambient temperature.
Structural design: modular design, relatively small number of components
Environmental adaptability: reliable operation in a wide temperature range from -40°C to +70°C.
Life Cycle: Mechanical life of more than 10,000 cycles.
Functional characteristics
Dual function of manual/electric energy storage
Complete mechanical interlock protection system
Visual indication of energy storage status
Dual protection of opening and closing coils
Anti-tripping function integrated
Applicable circuit breaker types
Particularly suitable for vacuum circuit breakers of 12kV-40.5kV voltage level, as well as some 72.5kV GIS combination appliances. Typical matching circuit breakers include:
Indoor centre-mounted vacuum circuit breakers
Fixed switchgear circuit breakers
Load switches for ring mains cabinets
Wind power special circuit breaker
Technical Advantages
Compared with other types of operating mechanism, spring mechanism has:
Maintenance-free: no need for hydraulic oil or compressed air, reducing maintenance workload
Fast response: the breaking time can be controlled within 30ms.
Energy-saving and environmentally friendly: energy storage motor power is usually ≤200W
Cost advantage: the whole life cycle cost is more than 40% lower than the hydraulic mechanism
Safety and reliability: no risk of leakage, good fire performance
Key parameters and applications
Output power: 50J-300J (matched according to circuit breaker model)
Closing time: 60-100ms
Breaking time: 25-45ms
Energy storage time: ≤15s (electric)
Insulation level: 2kV/1min industrial frequency withstand voltage
Protection level：IP65(Outdoor type)
Typical application scenarios: urban distribution networks, industrial and mining enterprises substations, railway traction power supply, new energy generation and grid connection, etc.
Huadian's Spring Mechanism Solution
Shaanxi Huadian Electric Co., Ltd. , as an industry-leading manufacturer of operating mechanisms, has 20 years of experience in spring mechanism research and development, and its products have passed KEMA, CESI and other international certifications. Our CTJ series spring-operated mechanisms have the following features:
Original cushioning technology, reducing mechanical shock by 45%.
Fully sealed structure design, dustproof and anti-corrosion
Intelligent monitoring interface, support remote status diagnosis
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