Switch Disconnector Contact Pin with Gas Quenching
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Solution Overview
Problem
Existing medium-voltage switch disconnectors face inefficiencies in arc interruption and connection processes, particularly in maintaining electrical conductivity and effectively managing arcing during disconnection.
Innovation Solution
The design incorporates a contact pin with a microphone-like structure and a blowing cylinder made of insulating plastic, where the contact pin fingers converge during disconnection, allowing the arc to be formed and then quenched by quenching gas emitted from the blowing cylinder, ensuring efficient arc interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional contact pieces are used for disconnection, then the structure is simple, but arc interruption is inefficient and electrical conductivity cannot be maintained
Solution Approach 1:
The contact piece is divided into multiple contact fingers (first contact finger, second contact finger, third contact finger) that can move independently. This segmentation allows different parts of the contact piece to perform different functions: maintaining electrical conductivity through parallel paths and enabling effective arc interruption through coordinated movement, thus resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The contact piece is designed with movable contact fingers that can dynamically adjust their positions during the disconnection process. The contact fingers move from an initial connected position to a final disconnected position, allowing the system to maintain electrical conductivity during the transition and then effectively interrupt the arc, improving reliability without requiring excessive structural complexity.
2Ease of manufacture
If the contact piece is simplified for ease of manufacture, then production is easier, but arc quenching effectiveness is reduced
Solution Approach 1:
A blowing device is introduced that uses gas flow (pneumatic principle) to quench the arc during disconnection. The blowing device includes a blowing nozzle and gas supply system that directs gas toward the arc path, effectively quenching the arc without requiring complex mechanical structures in the contact piece itself, thus maintaining ease of manufacture while improving arc quenching capability.
Solution Approach 2:
The blowing device acts as an intermediary element between the contact piece and the arc. Instead of relying solely on the contact piece structure to quench the arc, the blowing device introduces gas as a mediating substance that facilitates arc quenching, thereby decoupling the manufacturing complexity of the contact piece from the arc quenching effectiveness.
3Reliability
If the contact fingers are kept close for good electrical conductivity, then electrical performance is improved, but arc management during disconnection becomes difficult
Solution Approach 1:
The contact fingers are designed to dynamically change their spacing during operation. In the connected state, the contact fingers are close together to ensure good electrical conductivity with multiple parallel current paths. During disconnection, the contact fingers move apart in a controlled manner, creating sufficient spacing to manage and extinguish the arc effectively, thus resolving the contradiction between electrical conductivity and arc control.
Solution Approach 2:
The contact piece is segmented into multiple independent contact fingers that can be positioned at different locations. This segmentation creates multiple parallel electrical paths when connected, improving conductivity, while also providing spatial separation during disconnection that facilitates arc management. The segmented structure allows simultaneous optimization of both electrical performance and arc control.
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 ensures reliable electrical disconnection and reconnection while effectively managing arcing, enhancing the overall performance and efficiency of the switch disconnector.
Implementation Method 1
the arc to be formed and then quenched by quenching gas emitted from the blowing cylinder
Implementation Method 2
a blowing cylinder made of insulating plastic
Data Source
AI summary
A switch disconnector is disclosed. The switch disconnector has a main contact point and an arc interruption contact point, of which the main contact point opens before the arc interruption contact point during a disconnection operation and is closed after the arc interruption contact point during connection, with a stationary and a moving contact-piece arrangement, with the stationary contact-piece arrangement having a pot contact piece with contact fingers and with the moving main contact point having a contact cylinder which is connected to a contact mount, and with the arc interruption point having a contact pin as the stationary contact piece and an annular contact piece as the moving contact piece. The contact pin has a section composed of interruption-resistant material, whose external diameter is greater than the external diameter of the rest of the pin area. The contact pin has at least one slot which runs in the longitudinal direction and splits the pin into at least two pin fingers.