Vacuum Bulb Actuation via Electromagnetic Threshold Control
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Solution Overview
Problem
Existing systems for actuating vacuum interrupters in medium or high voltage electrical devices require precise mechanical adjustments and often unnecessarily open the vacuum interrupter, leading to inefficiencies and increased stress, especially when there is little or no current in the main circuit.
Innovation Solution
A system utilizing an electromagnet with a movable core and buffer device that drives the mobile electrode towards the open position only when the current reaches a predetermined threshold and duration, minimizing unnecessary openings and reducing mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical drive device with multiple small parts is used to open the vacuum bulb, then the opening mechanism can be precise and reproducible, but the device complexity increases due to the need for precise adjustments of multiple parts
Solution Approach 1:
The patent replaces the complex mechanical drive device with an electromagnet that directly actuates the movable electrode. The electromagnet converts electrical energy to mechanical motion, eliminating the need for multiple small mechanical parts, levers, and adjusting nuts while maintaining reliable and reproducible opening operation.
Solution Approach 2:
The electromagnet serves multiple functions: it acts as both the actuating mechanism and the control element. By controlling the timing and duration of electrical current to the electromagnet, the system achieves precise control over vacuum bulb opening without requiring separate mechanical control components.
2Reliability
If the vacuum bulb is opened systematically with every opening movement, then the main circuit is reliably interrupted, but the vacuum bulb undergoes unnecessary stress and wear when there is little or no current
Solution Approach 1:
The system uses the presence and magnitude of current in the main circuit as feedback to control vacuum bulb operation. The electromagnet is energized only when current exceeds a threshold level, allowing the system to respond dynamically to actual operating conditions rather than following a fixed mechanical sequence.
Solution Approach 2:
The actuation system transitions from a static mechanical linkage that always opens the vacuum bulb to a dynamic electromagnet-based system that adapts its operation based on real-time current conditions. This dynamic control allows the vacuum bulb to remain closed when unnecessary, reducing stress and extending service life.
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 solution ensures the vacuum interrupter opens only when necessary, reducing stress and simplifying the design by avoiding unnecessary activations and aligning with performance standards, while minimizing the number of openings and reducing dielectric stresses from capacitive loads.
Implementation Method 1
an electromagnet whose coil is connected between the moving electrode and the bypass contact, and whose core is mechanically linked to the moving electrode, so that the core drives the moving electrode towards the open position only when the value of the current through the coil reaches a predetermined threshold
Data Source
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AI summary
The invention relates to an actuation system for a vacuum tube (20) of an electrical device, the vacuum tube being connected in parallel to a main circuit (10) of one phase of the electrical device and comprising a moving electrode (22) and a fixed electrode (21). The actuation system includes a bypass contact (13) which is connected to a moving contact (14) of the main circuit (10) during an opening movement of the electrical device, and an electromagnet whose coil (30) is connected between the moving electrode (22) and the bypass contact (13), and whose core (31) is mechanically linked to the moving electrode (22), such that the core (31) drives the moving electrode (22) to an open position only when the value of the current flowing through the coil (30) reaches a predetermined threshold.