Vehicle Electrical Device Screen Arc Propagation
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Solution Overview
Problem
Existing high-voltage electrical devices for railway vehicles, such as circuit breakers, are prone to internal arc initiation and do not effectively prevent the propagation of electric arcs, which poses a risk of malfunction and reduces their service life.
Innovation Solution
An electrical device with a screen made of polymeric material, comprising at least one elastomer like silicone, is introduced to oppose the creation and propagation of electric arcs outside the enclosure, while also limiting humidity and dust diffusion, and is designed with a movable drive member and a flexible screen that can deform under pressure to prevent overpressure and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-voltage electrical device is used in railway vehicles, then the electrical power supply circuit can be protected in the event of a short circuit, but the device is prone to internal arc initiation and propagation
Solution Approach 1:
The enclosure is divided into two distinct zones by a partition wall: a first zone containing high-voltage electrical components and a second zone containing low-voltage or control components. This segmentation isolates the harmful electric arcs to the first zone, preventing them from affecting the second zone and thus resolving the contradiction between providing protection capability and preventing arc propagation.
Solution Approach 2:
A screen made of flexible polymeric material (such as silicone elastomer) is introduced as an intermediary barrier between the high-voltage zone and the rest of the enclosure. This screen blocks the propagation of electric arcs while allowing pressure equalization, thus protecting other components from arc damage while maintaining enclosure integrity.
2Duration of action of stationary object
If the enclosure is sealed to prevent moisture and dust diffusion, then component lifespan is extended, but overpressure from internal arcs cannot be relieved
Solution Approach 1:
The screen is made of flexible polymeric material that can deform under pressure. This flexible membrane maintains the seal to prevent moisture and dust diffusion (extending service life) while simultaneously allowing the enclosure to expand slightly when internal overpressure occurs, thus relieving stress without compromising the protective seal.
3Object-affected harmful factors
If a rigid screen is used to block electric arcs, then arc propagation is prevented, but the screen cannot deform to relieve internal pressure
Solution Approach 1:
The screen is specifically designed as a flexible membrane made of polymeric material rather than a rigid structure. This flexible screen effectively blocks electric arc propagation while being capable of deforming under internal pressure to relieve overpressure, thus simultaneously achieving both arc blocking and pressure relief functions.
Solution Approach 2:
The screen's physical state is changed from rigid to flexible by selecting appropriate polymeric materials. This parameter change enables the screen to dynamically adjust its shape and volume under pressure while maintaining its arc-blocking function, thus resolving the contradiction between arc blocking capability and pressure relief capability.
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 significantly reduces the risk of malfunction and extends the service life of the electrical device by preventing electric arc propagation and maintaining a lower humidity level inside the enclosure, making it safer and more reliable.
Implementation Method 1
a screen (18) made of a polymeric material, the polymeric material comprising at least one elastomer, such as a silicone
Implementation Method 2
the screen (18) is positioned between the high-voltage enclosure (12) and the actuator (14)
Implementation Method 3
the screen is flexible; the screen can deform under pressure to prevent overpressure and damage
Implementation Method 4
The screen also limits the diffusion of moisture and dust present outside the device towards the electrically powered components
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to an electrical device (10) for a vehicle, in particular for a railway vehicle, the electrical device (10) comprising a high-voltage enclosure (12), the high-voltage enclosure (12) having an electrical switch (30); an actuator (14); and a drive member (16) connecting the switch (30) to the actuator (14). The electrical device (10) further comprises a screen (18) disposed between the enclosure (12) and the actuator (14), the screen (18) having a recess (62) through which the drive member (16) extends, the distance (D) between the screen (18) and the drive member (16) being less than 3 mm, preferably less than 2 mm.