Technical Verification Of The Action Process Of Drop-out Fuse

High-speed photography observation
The 20,000 frames/s high-speed camera recording shows that the movement of the arc in the drop out fuse melting tube shows a spiral diffusion feature, and the maximum diffusion diameter does not exceed 80% of the inner diameter of the melting tube, which verifies the rationality of the structural design.
Spectral diagnostic technology
Through arc plasma spectral analysis (wavelength 200-900nm), the arc core temperature is measured to be 12000-15000K, and the temperature gradient in the outer layer is 5000K/mm, which is less than 8% of the simulation model.
Mechanical property test
After 5000 action tests, the fatigue life of the spring mechanism has a modulus of elasticity attenuation of <3%, which meets the requirements of DL/T640 standard. The contact separation synchronization deviation is controlled within ±0.5ms.
5. Technology Evolution Direction
Intelligent sensing fuse
Integrated fiber optic temperature sensor (accuracy ±1°C) and Rogowski coil to achieve holographic monitoring of the action process, with a data sampling rate of up to 1MHzo
Self-recovery fuse technology
The shape memory alloy (NiTiNOL) is used to make the fuse. After the phase change is triggered at 160°C, it can be restored to its initial shape after cooling to 80°C, realizing automatic reclosing after fault current limiting.
New arc extinguishing medium
The mixed gas of sulfur hexafluoride (SF) and nitrogen (ratio 1:4) is used to increase the medium strength to 3 times that of traditional materials, which is particularly suitable for DC side protection of new energy stations.