Switching Device for Rapid Phase Short-Circuiting and Earthing
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Solution Overview
Problem
Existing arc fault suppression devices in electric power networks are complex, costly, and inefficient, leading to prolonged outages and safety risks due to sequential short-circuiting methods, which fail to rapidly extinguish arcs and reduce pressure and toxic gas formation.
Innovation Solution
A simplified switching device with axially displaced phase contacts and a cylinder-shaped, movable contact with circumferentially disposed contact areas, driven by a Thomson coil to achieve instantaneous short-circuiting and earthing of phases, reducing arc fault duration and safety hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential short-circuiting method is used, then device complexity is reduced, but arc fault suppression speed is insufficient leading to prolonged outages
Solution Approach 1:
The switching device is segmented into multiple independent switching elements (first switching element for first phase, second switching element for second phase, third switching element for third phase) that can operate simultaneously. Each switching element controls a respective phase contact, allowing parallel operation to achieve rapid short-circuiting of all phases without requiring complex sequential coordination mechanisms.
Solution Approach 2:
The patent transitions from sequential temporal operation to parallel spatial operation by arranging phase contacts (1, 2, 3) in different spatial positions around the movable contact. This spatial arrangement enables simultaneous short-circuiting of all phases through independent switching elements, effectively moving the solution from one-dimensional sequential control to multi-dimensional parallel control.
2Object-affected harmful factors
If cabinet pressure relief systems are installed, then personal safety is improved, but device complexity and cost increase
Solution Approach 1:
The switching device performs preliminary action by rapidly short-circuiting all phases within 5 milliseconds before the arc can generate significant pressure and toxic gases. This preemptive short-circuiting eliminates the need for pressure relief systems and cabinet reinforcement, as the harmful effects are prevented before they can develop.
Solution Approach 2:
The patent converts the harmful arc fault into a beneficial controlled short-circuit event. By rapidly detecting the arc and immediately short-circuiting all phases through the movable contact, the dangerous uncontrolled arc is transformed into a controlled protective action that limits damage and protects personnel without requiring additional safety infrastructure.
3Duration of action of moving object
If rapid short-circuiting is achieved, then arc fault duration is reduced, but device complexity increases due to additional components
Solution Approach 1:
The patent merges multiple functions into a single movable contact component that simultaneously achieves short-circuiting of all three phases and earthing. The movable contact, when actuated, connects phase contacts 1, 2, and 3 to the earthed stationary contact at once, combining what would otherwise require separate switching mechanisms into one integrated solution.
Solution Approach 2:
The movable contact serves multiple functions simultaneously: it acts as a short-circuiting element for all phases, an earthing element, and a mechanical actuator response to the Thomson coil. This multi-functionality reduces the overall device complexity compared to using separate dedicated components for each function.
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 device enables rapid and simultaneous short-circuiting of phases, minimizing operational disturbances, reducing material damage, and enhancing personal safety by quickly reducing pressure and preventing toxic gas formation, while being cost-effective and easy to implement.
Implementation Method 1
driven by a Thomson coil to achieve instantaneous short-circuiting and earthing of phases
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a switching device for short-circuiting and earthing at least two phases in an electric power network. The device comprises a first phase contact (1), a second phase contact (2) and an earthed, movable contact (4), which can, on the one hand, assume a first position, where the contact (4) is insulated from the phases, and, on the other hand, a second position, where the contact is connected to the phase contacts and thereby earths and short-circuits the phases. The device is characterized in that the first phase contact and the second phase contact are axially displaced from each other and that they are disposed around the movable contact, and that the contact is cylinder-shaped and comprises two circumferentially disposed contact areas (18, 19; 34, 35), which are axially displaced from each other and intended to connect to the phase contacts in the second position, so that the phases are short-circuited and earthed via the contact, and that the device comprises electrically insulating areas (32; 33), which are adapted to abut against the phase contacts in the first position.