Vacuum Interrupter Pulse Conditioning With Adaptive Energy Control
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Solution Overview
Problem
Conventional pulse voltage conditioning methods for vacuum interrupters lack automatic energy adjustment, leading to insufficient conditioning or deconditioning effects due to inconsistent energy levels, which can result in suboptimal insulation performance.
Innovation Solution
A method that adjusts conditioning energy based on the breakdown voltage trend of the vacuum interrupter by automatically varying a current-limiting resistor and parallel capacitor, ensuring the energy reaches a critical value that optimally removes insulation defects without damaging the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditioning energy is increased to remove insulation defects, then insulation performance is improved, but electrode surfaces may be damaged causing deconditioning effect
Solution Approach 1:
The patent implements a feedback control mechanism where the breakdown voltage trend is continuously monitored during the conditioning process. The control system adjusts the conditioning energy in real-time based on whether breakdown occurs: decreasing energy if breakdown occurs (to prevent electrode damage) and increasing energy if no breakdown occurs (to ensure complete defect removal). This closed-loop feedback resolves the contradiction by dynamically balancing defect removal effectiveness against electrode surface protection.
Solution Approach 2:
The patent dynamically changes the conditioning energy parameter during the conditioning process based on the breakdown voltage trend. By adjusting the applied voltage and conditioning energy levels in response to real-time breakdown observations, the system optimizes the balance between removing insulation defects and preventing electrode surface damage, thereby resolving the technical contradiction.
2Object-affected harmful factors
If conditioning energy is decreased to protect electrode surfaces, then electrode damage is reduced, but insulation defects cannot be completely removed
Solution Approach 1:
The feedback control mechanism monitors breakdown voltage trends and adjusts conditioning energy accordingly. When no breakdown occurs, the system increases conditioning energy to ensure complete removal of insulation defects. This resolves the contradiction by ensuring sufficient energy is applied when electrode damage risk is low, while maintaining defect removal effectiveness.
Solution Approach 2:
The patent employs dynamic adjustment of conditioning energy levels during the conditioning process rather than using fixed energy levels. The system adapts the energy input in real-time based on the breakdown voltage trend, allowing optimal defect removal when conditions permit while preventing electrode damage when breakdown occurs, thereby resolving the contradiction between sufficient conditioning and electrode protection.
3Device complexity
If fixed conditioning energy is used to simplify the conditioning process, then process complexity is reduced, but optimal insulation performance cannot be achieved
Solution Approach 1:
The patent introduces a feedback control system that automatically adjusts conditioning energy based on breakdown voltage trends. This resolves the contradiction by implementing a relatively simple feedback mechanism (monitoring breakdown occurrence and adjusting energy accordingly) that achieves optimal insulation performance without requiring complex manual intervention or overly complicated control systems.
Solution Approach 2:
The conditioning system performs self-adjustment based on its own operational feedback (breakdown voltage trends). The system automatically determines whether to increase or decrease conditioning energy without external intervention, achieving optimal insulation performance while maintaining relatively simple process control. This self-service capability resolves the contradiction between process simplicity and performance optimization.
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
This approach effectively enhances the insulation performance of vacuum interrupters by preventing deconditioning effects and ensuring optimal energy levels, thereby improving the insulation strength.
Implementation Method 1
The voltage conditioning method applies a certain high voltage at both terminals of the vacuum interrupter, and the electric field is concentrated at the micro-protrusions on the cathode surface in the vacuum gap. Due to the high electric field, a high-energy electron beam is field-emitted.
Implementation Method 2
The electron beam impacts on the anode surface, causing the local temperature on the anode surface to increase sharply for gasification.
Implementation Method 3
The electron beam impacts on the anode surface, causing the local temperature on the anode surface to increase sharply for gasification.
Implementation Method 4
At the same time, the field emission also causes the local gasification on the cathode surface.
Data Source
AI summary
A pulse voltage conditioning method of a vacuum interrupter with automatic conditioning energy adjustment based on a trend of a breakdown voltage of the vacuum interrupter during a conditioning process. A current-limiting resistor and a parallel capacitor are automatically adjusted to ensure the conditioning energy reaching a critical value without deconditioning effect. The critical value refers to a maximum conditioning energy without damaging the electrode surfaces, namely an optimal conditioning energy, which can better remove insulation defects on the electrode surface and improve insulation performance of a vacuum gap. The problems of insufficient conditioning and deconditioning effect during conventional voltage conditioning process of the vacuum interrupter can be solved. Therefore, insulation strength of the vacuum interrupter can be raised to a higher level through conditioning.