Switchgear Linear Motor Control for Arcing Contact Position
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Solution Overview
Problem
Gas circuit breakers require precise management of component dimensions and electrode position adjustments to achieve high-speed fault current interrupting performance, leading to increased costs and complexity, with variations in devices due to fabrication efficiency considerations.
Innovation Solution
A switchgear configuration that includes a linear motor, position detecting device, and control device to adjust the moving arcing contact's position based on contact state and position information, eliminating the need for precise dimension management and simplifying component fabrication and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise dimension management and adjustment mechanisms are used to manage the position of the moving arcing contact, then the opening speed and fault current interrupting performance are improved, but the device complexity and fabrication cost increase
Solution Approach 1:
The patent replaces the traditional mechanical adjustment mechanism with a linear motor-driven electromagnetic system. The linear motor uses electromagnetic force to precisely control the position of the moving arcing contact, eliminating the need for mechanical adjustment mechanisms. This substitution reduces device complexity while maintaining precise position control capability, directly resolving the contradiction between reliability improvement and device complexity increase.
2Manufacturing precision
If component dimension management and adjustment operations are performed for each device, then the wiped length is within prescribed values, but the fabrication cost and operation time increase
Solution Approach 1:
The patent changes the control parameter from fixed mechanical dimension management to dynamic electromagnetic parameter control. The linear motor allows the wiped length to be adjusted by changing electrical parameters (voltage, current, frequency) rather than requiring precise mechanical dimension control of components. This enables flexible adjustment of the moving arcing contact position without increasing fabrication costs, as the same hardware can adapt to different requirements through parameter changes.
3Speed
If the position of the moving arcing contact is strictly managed, then the opening speed is controlled within prescribed values, but the degree of freedom in position is reduced
Solution Approach 1:
The patent transforms the static, fixed position management system into a dynamic, adjustable system. The linear motor enables the moving arcing contact position to be dynamically adjusted during operation based on actual conditions. The control device can modify the wiped length and opening speed in real-time, providing both precise control within prescribed values and flexibility for adaptation. This dynamic capability resolves the contradiction by allowing the system to maintain required performance while adapting to different operational scenarios.
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 increases the degree of freedom for the moving arcing contact, simplifies component fabrication, reduces costs, and enhances the reliability of the device by eliminating the need for complex adjustment mechanisms.
Implementation Method 1
a linear motor that generates drive force for operating the moving arcing contact
Implementation Method 2
a position detecting device that detects a position of a moving element of the linear motor
Implementation Method 3
a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact
Data Source
AI summary
The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost. The switchgear according to the invention includes: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.