Surge Arrestor Movable Control Cover for Sealed Electrical Connection
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Solution Overview
Problem
Existing surge arresters require opening the housing to establish or interrupt the electrical connection, leading to the undesirable escape of sulfur hexafluoride, a harmful greenhouse gas, and are mechanically complex due to high moving masses.
Innovation Solution
A surge arrester design featuring a movable control cover and diverting element within a fluid-tight housing, allowing for simple establishment or interruption of electrical connections without opening the housing, utilizing a displacement device with a rotary motion actuated shaft, push rod, and gear mechanism for compact operation and sealed movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the housing is opened to establish or interrupt the electrical connection, then the electrical connection can be made, but sulfur hexafluoride escapes which is harmful to the environment
Solution Approach 1:
The patent divides the system into separate functional components: the control hood that can be moved independently, the discharge column, and the housing. This segmentation allows the control hood to be disconnected without opening the housing, thus preventing gas escape while enabling electrical connection interruption.
Solution Approach 2:
The control hood acts as an intermediary component between the discharge column and the external circuit. By moving this intermediate component, the electrical connection can be made or broken without affecting the sealed housing, thus preventing sulfur hexafluoride leakage while enabling operational control.
2Ease of operation
If the housing is opened to establish or interrupt the electrical connection, then the electrical connection can be made, but the mechanical structure becomes more complex
Solution Approach 1:
The patent extracts the connection-making function from the housing structure itself and relocates it to the movable control hood. This extraction allows the housing to remain sealed and structurally simple, while the control hood handles the connection/interruption operation through its independent movement.
3Ease of operation
If the control hood and diverting element are made movable relative to each other, then the electrical connection can be simply established or interrupted, but the moving mass increases requiring more complex mechanical elements
Solution Approach 1:
The patent introduces dynamic movement between the control hood and diverting element, allowing them to move relative to each other along the longitudinal axis. This dynamic arrangement enables simple connection/interruption operations while the guided linear movement minimizes the complexity of mechanical elements despite the moving mass.
4Volume of moving object
If the control hood is designed to be displaceable along the longitudinal axis, then space is utilized efficiently, but the precision of electrical connection increases difficulty
Solution Approach 1:
The patent confines the movement to a single linear dimension (longitudinal axis), which simplifies the alignment requirements compared to multi-dimensional movement. This one-dimensional displacement along the longitudinal axis achieves efficient space utilization while maintaining manageable alignment precision through the constrained movement path.
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 efficient and gas-tight operation with reduced mechanical effort, preventing gas escape and maintaining dielectric strength, thus simplifying the electrical connection process and minimizing maintenance.
Implementation Method 1
Varistor elements are characterized by a voltage-dependent resistance. At low voltages, these act as insulators. Above a certain threshold voltage, which depends on the material, they show good conductivity.
Implementation Method 2
The housing is filled with a fluid, usually sulfur hexafluoride, to increase the dielectric strength.
Implementation Method 3
the varistor column must be held together under pressure. This can be done by tensioning tension elements, for example ropes or rods preferably made of glass fiber reinforced plastic, in the end fittings under tension.
Data Source
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AI summary
The invention relates to a surge arrestor (1) with a dissipating element (20), a control cowl (40), which is electrically connected to the dissipating element (20), and a fluid-tight housing (2), in which the dissipating element (20) and the control cowl (40) are arranged and which has two contacts (7, 8), which each electrically connects the interior to the exterior of the housing (2). By virtue of the fact that the dissipating element (20) and the control cowl (40) are designed so as to be moveable relative to one another, wherein an electrical connection of one of the contacts (7, 8) via the dissipating element (20) to the other of the contacts (8, 7) can be produced or interrupted by virtue of the relative movement, a surge arrestor is provided which enables structurally simpler production or interruption of the electrical connection.