Series Interrupter Switching with Variable Control Capacitors
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Solution Overview
Problem
In series-connected interrupter units, particularly vacuum switching tubes, dynamic voltage distribution during switching procedures leads to uneven voltage loading, requiring higher-rated units or additional units to ensure electric strength, resulting in increased costs.
Innovation Solution
A switching device with mechanically movable control capacitors coupled to the drive unit, allowing dynamic capacitance changes to maintain equal voltage across interrupter units, reducing the need for higher-rated or additional units by compensating for voltage peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control capacitors with fixed capacitance are used in series-connected interrupter units, then the voltage distribution can be controlled, but dynamic voltage distribution during switching causes uneven voltage loading requiring higher-rated units
Solution Approach 1:
The patent applies the dynamics principle by making the control capacitor's capacitance variable rather than fixed. The control capacitor includes a movable component (such as a movable electrode or dielectric) that can change its position during switching, thereby dynamically adjusting the capacitance value. This dynamic adjustment allows the control capacitor to compensate for dynamic voltage distribution during switching procedures, ensuring more uniform voltage loading across interrupter units without requiring excessive safety reserves or higher-rated units.
2Reliability
If more interrupter units are connected in series to achieve stipulated rated voltage, then the total electric strength increases, but the cost increases due to dynamic voltage distribution
Solution Approach 1:
By implementing dynamic capacitance adjustment in the control capacitor, the system can maintain more uniform voltage distribution across the interrupter units during switching. This reduces the need to add extra interrupter units solely to accommodate voltage peaks caused by dynamic distribution, thereby achieving the stipulated rated voltage with fewer units and lower overall cost.
3Reliability
If higher-rated interrupter units are used to ensure electric strength during switching, then voltage distribution is controlled, but the investment cost increases
Solution Approach 1:
The patent changes the parameter of the control capacitor from fixed capacitance to variable capacitance. By adjusting the capacitance value dynamically during switching operations, the system can better control voltage distribution across interrupter units. This parameter change allows the use of interrupter units with lower safety reserves, reducing the investment required while maintaining reliable operation.
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 configuration enables efficient use of rated voltages, reducing safety reserves and investment costs by allowing fewer or lower-rated units to achieve the desired switching voltage, while maintaining reliable operation.
Implementation Method 1
two control capacitors, which are connected in parallel with the interrupter units in each case
Data Source
AI summary
A switching device includes: two interrupter units connected in series; at least one drive unit for moving at least one contact; and two control capacitors, each of which is connected in parallel with the interrupter units. At least one control capacitor has mechanically movable components for changing the capacitance, and at least one of these components is mechanically coupled to the drive unit.