Gas-Insulated Switch Movable Contact Unit Arc Energy Acceleration
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Solution Overview
Problem
High voltage switchgears using sulfur hexafluoride (SF6) face challenges with high greenhouse potential and increased technical expenditure for vacuum switching tubes to maintain voltage stability, especially during power failures.
Innovation Solution
A gas-insulated switch design with a movable contact unit and a multi-part insulation nozzle system, including a primary and auxiliary nozzle with a heating channel, where the gas reservoir enlarges during contact opening, utilizing the hot gas to accelerate the movement contact system, enhancing opening speed and reducing drive energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional gas-insulated switch is used, then the structure is simple, but the opening speed of contacts in case of short-circuit is insufficient
Solution Approach 1:
The patent applies the dynamics principle by making the wall radially delimiting the gas reservoir movable rather than fixed. During normal operation, the wall remains stationary, but during opening operation, it moves to enlarge the gas reservoir volume, dynamically adapting the system to different operational states. This movable wall enables accelerated contact opening without requiring a permanently complex structure.
Solution Approach 2:
The patent segments the gas reservoir into a fixed portion and a movable portion delimited by the movable wall. This segmentation allows the gas reservoir to expand during opening operation while maintaining a compact structure during normal operation, resolving the contradiction between opening speed and structural complexity.
2Reliability
If vacuum switching tubes are used to ensure voltage stability, then voltage stability is improved, but technical expenditure and installation space increase disproportionately
Solution Approach 1:
The patent applies the self-service principle by enabling the gas-insulated switch to open under electrical load and dielectrically discharge the vacuum switching tube automatically. The system uses its own operational energy to achieve the necessary voltage discharge, eliminating the need for additional expensive vacuum switching tubes and reducing installation space while maintaining voltage stability.
3Reliability
If the gas reservoir volume is increased to improve arc extinction, then arc extinction capability is improved, but the device size increases
Solution Approach 1:
The patent uses the dynamics principle to create a gas reservoir that expands only when needed during opening operation. The movable wall allows the gas reservoir volume to increase during arc extinction phase, improving arc extinction capability, while returning to a compact size during normal operation, thus avoiding permanent device size increase.
Solution Approach 2:
The movable wall operates periodically - remaining stationary during normal operation and moving to enlarge the gas reservoir only during opening operation. This periodic action allows the system to achieve improved arc extinction capability temporarily without permanently increasing device size.
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 achieves higher contact opening speeds and reduced technical expenditure for vacuum switching tubes, enabling higher voltage ratings with less installation space and lower manufacturing costs, while effectively managing electrical arcs during short-circuits.
Implementation Method 1
a heating channel is formed between the primary nozzle and the auxiliary nozzle, which originates from an electric arc chamber and opens in a gas reservoir
Implementation Method 2
utilizing the hot gas to accelerate the movement contact system, enhancing opening speed and reducing drive energy requirements
Data Source
AI summary
A gas-insulated switch has a first contact and a second contact. A contact unit is connected to the first contact as a movement contact unit having a drive unit and is movably mounted along a switch axis. The gas-insulated switch further has a multi-part insulation nozzle system with a primary nozzle and an auxiliary nozzle. A heating channel is formed between the primary nozzle and the auxiliary nozzle. The heating channel originates from an electric arc chamber and opens in a gas reservoir, wherein the gas reservoir is delimited by a ram. The gas reservoir is radially delimited by a wall, in respect of the switch axis, which is not a component of the movement contact unit, and the ram is part of the movement contact unit and is movably mounted such that the ram moves along the switch axis away from the second contact to enlarge the gas reservoir.