Ring Main Unit Circuit Breaker Contact Force Controller
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Solution Overview
Problem
Conventional ring main unit circuit breakers require complex disassembly operations to maintain contact force between vacuum interrupter contacts, leading to increased operational risks and maintenance costs due to decreased contact force caused by repeated opening and closing cycles.
Innovation Solution
A ring main unit circuit breaker equipped with a contact force controller, featuring a transmission link with a controllable length, allowing for simple manual adjustment of the interval between contacts without disassembly, using a rotational shaft, cam, power transmission pin, movable rod, contact spring, and vacuum interrupter, along with a driving shaft, driving link, and rotation link to control the contact force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the circuit breaker is disassembled to compensate contact force by moving the fixed electrode upward using a spacer, then the contact force can be restored, but the operational complexity and maintenance time increase significantly
Solution Approach 1:
The circuit breaker performs self-adjustment of contact force through an automatic compensation mechanism. The movable electrode is equipped with a threaded rod and nut assembly that automatically compensates for contact force degradation through thermal expansion and contraction cycles, eliminating the need for manual disassembly and adjustment by maintenance personnel.
Solution Approach 2:
The compensation mechanism is pre-configured during manufacturing with adjustable spacers and threaded components. The system is designed to automatically perform the compensation action before contact force degradation leads to failure, using pre-installed adjustment mechanisms that can be tuned during initial setup to match specific operational conditions.
2Length of stationary object
If the fixed electrode is moved upward using a spacer to compensate contact force, then the contact interval is restored, but the maintenance cost and operational risk increase
Solution Approach 1:
The circuit breaker performs self-adjustment of contact force through an automatic compensation mechanism. The movable electrode is equipped with a threaded rod and nut assembly that automatically compensates for contact force degradation through thermal expansion and contraction cycles, eliminating the need for manual disassembly and adjustment by maintenance personnel.
Solution Approach 2:
The design incorporates adjustable spacers and threaded adjustment mechanisms that provide a buffer against contact force degradation. These pre-configured elements absorb the wear and thermal deformation that occur during operation, cushioning the system against the harmful effects of contact force loss before they lead to failure.
3Force
If manual disassembly and reassembly operations are performed to control contact interval, then the contact force can be maintained, but the productivity and operational efficiency decrease
Solution Approach 1:
The circuit breaker performs self-adjustment of contact force through an automatic compensation mechanism. The movable electrode is equipped with a threaded rod and nut assembly that automatically compensates for contact force degradation through thermal expansion and contraction cycles, eliminating the need for manual disassembly and adjustment by maintenance personnel.
Solution Approach 2:
The compensation mechanism incorporates dynamic adjustment capabilities through threaded rods and nuts that allow for continuous fine-tuning of the contact interval. The system can adapt to changing operational conditions and wear patterns in real-time, maintaining optimal contact force without requiring periodic manual intervention and disassembly.
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
Enables stable control of contact force between contacts during manufacturing and service states, enhancing operational reliability and reducing maintenance and repair costs by allowing for external manual adjustment of the contact interval without disassembly.
Implementation Method 1
a cam 102 configured to convert a rotation force of the rotational shaft 101 into a vertical force
Implementation Method 2
a contact spring 105 configured to provide a contact force to the movable rod 106
Implementation Method 3
a vacuum interrupter 107 having one end connected to the movable rod 106, and including a movable electrode 171 and a fixed electrode 172
Data Source
AI summary
The present invention relates to a ring main unit circuit breaker equipped with a contact force controller, and particularly, to a ring main unit circuit breaker equipped with a contact force controller, capable of controlling a contact force between contacts of a vacuum interrupter, by controlling an interval between the contacts, through a simple manual operation from outside, without having a disassembly operation.