Oscillating Shielding Cover for Particle Trapping in HV Gas Insulated Devices
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Solution Overview
Problem
Existing particle traps in high-voltage circuit breakers are ineffective in dislodging particles that become stuck or obstructed, leading to potential dielectric breakdown due to the lack of a mechanism to remove lodged particles.
Innovation Solution
A gas-insulated high-voltage electrical device with a longitudinally oscillating shielding cover made of non-ferromagnetic material, tuned to the mechanical resonating frequency of the conductor, which induces vibrations to dislodge particles and guide them into a dielectrically shielding area for trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary particle trap is used to trap particles in the dielectrically shielding area, then particles can be trapped effectively, but particles that become stuck or obstructed cannot be dislodged
Solution Approach 1:
The shielding cover is transformed from a static structure to a dynamic one that can oscillate at its mechanical resonating frequency. This dynamic capability allows the cover to dislodge particles that become stuck or obstructed in the particle trap, while still maintaining the trapping function when stationary. The oscillation is induced by the interaction between the high voltage current and the small circulating current in the tank.
Solution Approach 2:
The shielding cover is designed to oscillate at its mechanical resonating frequency when high voltage current passes through the conductor. This mechanical vibration serves to dislodge particles that become stuck or obstructed in the particle trap, preventing them from remaining in positions where they could cause dielectric breakdown. The resonating frequency is tuned to maximize the dislodging effect.
2Stability of the object's composition
If the shielding cover is made stationary to maintain electrical contact, then electrical connection is stable, but particles cannot be dislodged from the trap
Solution Approach 1:
The shielding cover is designed to be both electrically connected and mechanically oscillating. The oscillation occurs at the mechanical resonating frequency, which is distinct from the electrical frequency. This allows the cover to maintain stable electrical contact while simultaneously providing mechanical vibration to dislodge particles, resolving the contradiction between electrical stability and particle removal capability.
Solution Approach 2:
The shielding cover oscillates at its mechanical resonating frequency when high voltage current passes through the conductor. This mechanical vibration serves to dislodge particles that become stuck or obstructed in the particle trap, preventing them from remaining in positions where they could cause dielectric breakdown. The resonating frequency is tuned to maximize the dislodging effect.
3Productivity
If the shielding cover oscillates at mechanical resonating frequency to dislodge particles, then particle transport into the trap increases, but the structure becomes more complex
Solution Approach 1:
The shielding cover utilizes the existing high voltage current and the small circulating current in the tank to induce its own mechanical oscillations at the resonating frequency. No external actuator or additional energy source is required - the system uses its own operational parameters to generate the necessary vibration, thereby increasing particle transport efficiency without adding structural complexity.
Solution Approach 2:
The shielding cover's mechanical resonating frequency is tuned to match or interact with the electrical operating frequency. By adjusting the physical parameters of the cover (mass, stiffness, geometry), the system exploits the interaction between electrical current and mechanical resonance to achieve particle dislodging without requiring additional complex mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively increases the transport of particles into the protected region of the particle trap, reducing the risk of dielectric breakdown by naturally causing vibrations through the interaction of the current and the small current circulating in the tank, ensuring efficient particle removal.
Implementation Method 1
the interaction of the current and the small current circulating in the tank
Implementation Method 2
the shielding cover comprising a mechanical resonating frequency that makes the shielding cover longitudinally oscillate when the high voltage current passes through the conductor
Implementation Method 3
The shielding cover oscillations lead the particles to fall in the shielding area of the particle trap, by causing motion of the particles in order to transport them inside the particle trap
Implementation Method 4
a dielectrically shielding area in the enclosure for trapping particles; in which zero or near zero electric fields are created. In operation, particles are guided to the particle trap by an electric field which exists between the live and grounded parts of the circuit breaker and are trapped by the low electric field in the trap
Data Source
Figure 1~3
Figure 4~5b
Figure 6~8
AI summary
A gas insulated high voltage electrical device comprising: at least one conductor for conducting a high voltage current; a longitudinal enclosure (30) for enclosing the at least one conductor, the longitudinal enclosure comprising an interior wall (1) extending along a longitudinal axis; a particle trap (9) formed on the interior wall (1) and extending along the longitudinal axis, the particle trap (9) comprising a part of the interior wall (1) and a longitudinal shielding cover (4) extending along the longitudinal axis to delimit a dielectrically shielding area in the enclosure (30) for trapping particles; the shielding cover (4) being made of an electrically conducting material and comprising at least two electrical connections (7) to the interior wall (1) spaced from each other along the longitudinal axis, the shielding cover (4) comprising a mechanical resonating frequency that makes the shielding cover (4) longitudinally oscillate when the high voltage current passes through the conductor.