Compact Pole Unit for Circuit Breakers with Segmented Electrodes
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Solution Overview
Problem
High voltage vacuum interrupters in electrical circuit breakers face challenges with large electrode assemblies opening slowly due to high rated currents, requiring significant design considerations for materials strength and compactness, especially when using ultra-fast actuators which accelerate a large mass over a short distance.
Innovation Solution
A compact pole unit design with an encapsulated body, including a first and second conducting terminal, a vacuum interrupter, and a coupler assembly with a contact spring and plunger, utilizing ultra-fast and slower actuators to achieve rapid opening and closing of the circuit breaker, allowing for reduced mass and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ultra-fast actuators are used to accelerate electrode assemblies, then opening speed is improved, but material strength requirements and device complexity increase due to high G-forces
Solution Approach 1:
The electrode assembly is divided into two parts: a fixed electrode assembly and a movable electrode assembly. The movable electrode assembly has reduced mass compared to conventional single-piece designs, allowing ultra-fast actuators to achieve high opening speeds without subjecting excessive mass to extreme G-forces. This segmentation enables the actuator to accelerate only the necessary moving components rather than the entire electrode assembly.
Solution Approach 2:
The contact spring is extracted from the movable electrode assembly and repositioned on the fixed electrode assembly. This removes the spring mass from the accelerated components, further reducing the mass that the ultra-fast actuator must accelerate. The spring remains functional for providing contact force but no longer contributes to the inertial load during rapid opening.
2Reliability
If larger electrode assemblies are used to handle high rated currents, then current carrying capacity is improved, but opening speed deteriorates due to increased mass
Solution Approach 1:
The electrode assembly is segmented into fixed and movable portions, with the movable portion optimized for minimal mass while the fixed portion can be larger to handle high current carrying requirements. This allows the system to maintain high current capacity through the fixed electrode and terminal structure while the lightweight movable electrode enables rapid opening speeds.
Solution Approach 2:
Different parts of the electrode assembly have different mass characteristics optimized for their specific functions. The fixed electrode assembly and terminal structure are designed with sufficient mass and dimensions to handle high rated currents, while the movable electrode assembly is minimized in mass to enable ultra-fast actuation. This local optimization of mass distribution resolves the contradiction between current capacity and opening speed.
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 faster opening times, reduced mass, and increased energy efficiency by using a compact pole unit with a contact spring on the fixed end of the vacuum interrupter, allowing for faster actuators and reduced material strength requirements, effectively addressing the challenges of high voltage and high current interruption.
Implementation Method 1
The coupler assembly includes a contact spring positioned at the second end of the compact pole unit
Data Source
AI summary
A circuit breaker includes a compact pole unit with an encapsulated body having ring(s) and conducting terminals that each extend from the encapsulated body. The body includes a vacuum interrupter and a coupler assembly that may be integrated into the pole unit. The coupler assembly includes a contact spring positioned an end of the compact pole unit, as well as a plunger that may be biased by the contact spring. The circuit breaker also includes an actuator positioned at the end of the pole unit that is opposite the coupler assembly. The circuit breaker also may include a second actuator that is will be connected to the contact spring of the coupler assembly via the plunger, and if so the breaker may be operated via either actuator.