Switchgear Movable Electrode Arc Control
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Solution Overview
Problem
High-voltage electrical equipment for transmission lines faces challenges in preventing radial ramifications of electric arcs during closing and opening phases, which can damage the enclosure and reduce reliability due to existing solutions being costly or increasing the risk of arc propagation.
Innovation Solution
The design incorporates a movable downstream contact and synchronized radial electrodes that establish an indirect and direct electrical connection between upstream and downstream contacts, minimizing arc formation by maintaining contact and electrode alignment during movement, thereby controlling arc propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed of movement of the moving contact is increased to limit the appearance of radial ramifications of electric arcs, then the reliability is improved, but the device complexity and cost increase due to requiring drive means of large dimensions
Solution Approach 1:
The patent divides the contact system into multiple segments: a fixed contact, a movable contact, and an intermediate contact. This segmentation allows the movable contact to move at high speed to prevent radial arc ramifications while the intermediate contact absorbs the mechanical stress and electrical arc energy, eliminating the need for oversized drive means and reducing device complexity.
Solution Approach 2:
The intermediate contact acts as a mediator between the fixed contact and the movable contact. It receives the movable contact before the fixed contact during closing operations, thereby delaying the appearance of the main electric arc and allowing the movable contact to operate at high speed without requiring complex drive mechanisms.
2Productivity
If the rapid opening of a disconnector is performed on a portion of busbars with no load, then the productivity is improved, but the trapped electrical charge increases which raises the likelihood of arc development towards the tank
Solution Approach 1:
The patent introduces a preliminary action phase where the intermediate contact is activated before the main movable contact engages with the fixed contact. This preliminary action allows trapped electrical charge to be safely dissipated through the intermediate contact during rapid opening operations, preventing subsequent arc development towards the tank while maintaining high productivity.
Solution Approach 2:
The intermediate contact serves as a mediator that safely handles trapped electrical charge during rapid opening operations. By providing a controlled path for charge dissipation before the main contact separation, it enables high-speed operation without the harmful effects of trapped charge accumulation.
3Reliability
If solutions are implemented to limit the appearance of electric arcs or reduce their duration, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the contact closing sequence into two distinct phases: first the intermediate contact engages to delay and control arc appearance, then the movable contact completes the connection. This segmentation limits electric arc duration and appearance without requiring complex additional control systems, maintaining simplicity while improving reliability.
Solution Approach 2:
The patent employs dynamic timing control where the intermediate contact is activated at a specific moment during the closing operation to optimize arc control. This dynamic approach limits arc duration and appearance through precise temporal coordination rather than complex structural additions.
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 design effectively limits the formation and duration of electric arcs, enhancing the reliability and reducing the risk of arc-induced damage to the enclosure during operation.
Implementation Method 1
this enclosure is filled with an electrically insulating gas such as for example sulfur hexafluoride SF6 or a pressurized gas mixture, making it possible to limit the formation of the electric arc
Implementation Method 2
When closing or opening the electrical equipment, due to the potential difference between the contacts, one or more electric arcs are formed between the two contacts
Data Source
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AI summary
The invention relates to a high-voltage appliance (10) comprising: an upstream contact (12) and a downstream contact (22) axially movable between a closed position of the appliance (10) and a downstream open position of the appliance (10); and a downstream electrode (30) that is rigidly connected to the downstream contact (22) during a movement between said downstream position and an intermediate position located downstream from the upstream position and located upstream from said downstream position, characterized in that the upstream contact (12) is movably mounted in the appliance (10) and is capable of moving, while rigidly connected to the downstream contact (22), between a downstream position in which the contact is set up between the upstream contact (12) and the downstream contact (22), and an upstream position corresponding to the closed position of the appliance (10).