Grooved Insulation Structure for Fast High-Voltage Switching
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Solution Overview
Problem
High voltage electrical switching systems face a trade-off between rapid switching and preventing dielectric breakdown, as large insulating spacers increase inductance and reduce the effectiveness of fast switching, particularly in pulsed power systems.
Innovation Solution
An electrical switching arrangement with a set of electrodes and a ground conductor, featuring an insulation block with grooves for insulation members that reduce inductance and dielectric breakdown risk by trapping surface tracking, allowing the conductors to be closer together without a large single insulation block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a significantly sized insulating spacer is provided to prevent dielectric breakdown at high voltage, then the ability to prevent dielectric breakdown is improved, but the inductance of the system increases due to the electrodes and terminals being positioned further away from each other
Solution Approach 1:
The insulating spacer is segmented into multiple sections with grooves that receive insulation members, allowing the insulation function to be distributed across multiple components rather than requiring a single large solid spacer. This segmentation enables the electrodes to be positioned closer together while maintaining adequate insulation, thereby reducing inductance while preventing dielectric breakdown.
Solution Approach 2:
Insulation members are nested within grooves of the insulating spacer, creating a layered insulation structure. This nesting approach allows multiple insulation elements to be compactly arranged, providing sufficient insulation distance to prevent breakdown while keeping the overall structure compact and electrodes close together, thus minimizing inductance.
2Reliability
If a large insulating spacer is used to ensure reliable switching at high voltage, then the reliability of switching is improved, but the switching speed decreases due to increased inductance
Solution Approach 1:
The segmented insulating spacer structure with multiple insulation members allows the system to achieve reliable high voltage switching without requiring a large single-piece spacer. This enables the electrodes to be positioned closer together, reducing inductance and thereby improving switching speed while maintaining the reliability needed for high voltage operation.
3Speed
If the volume of the insulating spacer is reduced to decrease inductance, then the switching speed is improved, but the risk of dielectric breakdown increases
Solution Approach 1:
By nesting insulation members within grooves of the insulating spacer, the design achieves compact insulation that provides adequate breakdown protection in a reduced volume. This nested arrangement maintains the necessary insulation distance to prevent dielectric breakdown while keeping the overall spacer volume small, thus maintaining low inductance and high switching speed.
Solution Approach 2:
The insulating spacer system uses composite construction combining the spacer material with separate insulation members inserted into grooves. This composite approach optimizes the insulation properties while minimizing the volume required, allowing the system to achieve both low inductance for fast switching and sufficient insulation for high voltage reliability.
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 enables rapid high voltage and current switching with reduced inductance and dielectric breakdown risk, facilitating efficient discharge of capacitors in high voltage systems.
Implementation Method 1
an insulating spacer may be provided between the electrodes of the switch and between the different terminals (e.g. live and ground) of the high voltage system... to prevent dielectric breakdown, e.g. by surface tracking
Implementation Method 2
prevent dielectric breakdown, e.g. by surface tracking
Implementation Method 3
the set of electrodes is for switching between a first side of the live conductor and a second side of the live conductor
Data Source
Figure 1
Figure 2
AI summary
An electrical switching arrangement (11) for an electrical power supply includes a live conductor. The live conductor includes electrodes (12) for switching between first and second sides (14), (16) of the live conductor. The electrical switching arrangement also includes a ground conductor (18), an insulation block (20) between the electrodes and the ground conductor, a first insulation member (26) extending from the insulation block on the first side of the electrodes, and a second insulation member (28) extending from the insulation block on the second side of the electrodes. The insulation block includes a first groove (22) in which an edge of the first insulation member is located and a second groove (24) in which an edge of the second insulation member is located.