Vacuum Switchgear Chattering Suppression via Segmented Base Plates
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Solution Overview
Problem
Existing power switchgear designs face challenges in suppressing chattering between movable and fixed contacts during contact closing operations and in controlling phase-specific switching, especially when dealing with single-phase or three-phase configurations.
Innovation Solution
A power switchgear design featuring a pressure tank filled with insulating gas, a vacuum valve with coaxially disposed electrodes, an electromagnetic operating mechanism, a contact pressure spring, and a release spring, along with a chattering suppression structure that uses an insulating rod and a linking mechanism to minimize chattering and enable phase control by independent operation of each phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If three units of operating mechanisms are placed on one base plate with coaxially arranged components, then contact opening speed is accelerated, but chattering phenomenon occurs and suppression becomes difficult
Solution Approach 1:
The patent divides the base plate into three separate base plates, one for each phase. This segmentation isolates the operating mechanisms of each phase, preventing chattering vibration from propagating between phases while maintaining the coaxial arrangement that ensures fast contact opening speed.
2Ease of operation
If one driving shaft passes through movable shafts of three phase vacuum valves to drive them collectively, then simultaneous opening and closing in three phases is achieved, but phase control capability is lost
Solution Approach 1:
The patent replaces the single driving shaft with three separate operating mechanisms, each with its own driving shaft. This allows each phase to be operated independently, enabling phase control capability while still achieving simultaneous operation when needed by coordinating the control signals to all three mechanisms.
3Speed
If vacuum valves are disposed for three phases in parallel with predetermined distance spaced, then electromagnetic force and spring force are added for fast opening, but chattering receives influence from other phases via base plate
Solution Approach 1:
By providing separate base plates for each phase, the patent prevents chattering vibration from one phase from being transmitted to other phases through the base plate, while maintaining the parallel disposition that allows electromagnetic and spring forces to act effectively for fast opening.
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 design effectively suppresses chattering and allows for independent phase control, reducing the influence of other phases' operations, minimizing mechanical components, and enhancing reliability and productivity while maintaining a compact and cost-effective structure.
Implementation Method 1
an electromagnetic operating mechanism which drives the movable side current-carrying shaft via the insulating rod by being energized
Implementation Method 2
a contact pressure spring which is coaxially disposed with the electromagnetic operating mechanism, and applies contact pressure between the movable side electrode and the fixed side electrode by being compressed
Implementation Method 3
a release spring which is coaxially disposed with the electromagnetic operating mechanism, and assists driving force of the electromagnetic operating mechanism during contact opening of the vacuum valve
Data Source
AI summary
A vacuum valve includes a fixed side electrode on a fixed side current-carrying shaft and a movable side electrode on a movable side current-carrying shaft. An opening and closing unit is coaxially disposed with the movable side current-carrying shaft, and drives the movable side current-carrying shaft. A chattering suppression structure is coaxially disposed with the fixed side current-carrying shaft on the fixed side of the vacuum valve, and suppresses chattering. The opening and closing unit includes an electromagnetic operating mechanism which drives the movable side current-carrying shaft when energized. A contact pressure spring is coaxially disposed with the electromagnetic operating mechanism, and applies contact pressure between the movable side electrode and the fixed side electrode during contact closing of the vacuum valve. A release spring is coaxially disposed with the electromagnetic operating mechanism, and assists driving force of the electromagnetic operating mechanism during contact opening of the vacuum valve.