Horn Spark Gap Overvoltage Protection with Thermal and Arc Disconnection
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Solution Overview
Problem
Existing overvoltage protection arrangements fail to provide a unified mechanism for disconnecting in response to excessive thermal load and borderline arcs, and lack a single, independent display for fault status indication regardless of the fault type or cause.
Innovation Solution
An overvoltage protection arrangement featuring a horn spark gap in an insulating housing with a deion chamber and a series-connected varistor, incorporating two disconnection apparatuses: a thermal disconnection using a solder joint and a fusible conductor within the deion chamber, along with a rotatably mounted star and pivotable lever for remote signaling and visual fault display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single display device is used to indicate all fault statuses, then the device complexity is reduced and space is saved, but it becomes difficult to detect and measure different fault types with a single indicator
Solution Approach 1:
The single display device is segmented into two distinct display regions: a first display region that visually indicates thermal overload faults, and a second display region that visually indicates arc faults. This segmentation allows one unified device to simultaneously present different fault types through spatially separated visual indicators, resolving the contradiction between device simplicity and fault detection capability.
2Device complexity
If disconnection apparatuses are integrated within the housing, then the device complexity is reduced, but the ease of operation for resetting the system after fault clearance becomes more difficult
Solution Approach 1:
The reset function is extracted from the internal disconnection apparatuses and implemented as a separate, manually operable reset button on the housing. This allows the disconnection apparatuses to remain integrated within the housing for structural simplicity, while the reset operation is made easily accessible to users through an external interface, resolving the contradiction between integrated design and operational ease.
3Reliability
If the fusible conductor is placed inside the deion chamber, then the reliability of arc fault detection is improved, but the device complexity increases due to additional integration requirements
Solution Approach 1:
The fusible conductor is merged with the deion chamber structure, where it serves dual functions: as a reliable arc fault detection element positioned within the arc path, and as an integrated component of the chamber assembly. This merging reduces the need for separate mounting structures and complex integration mechanisms, thereby maintaining reliability while minimizing the increase in device complexity.
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 reliable disconnection during thermal overload and arc events, ensuring a single display device can symbolize and remotely signal all fault statuses, preventing further electrical engagement and providing clear fault indication.
Implementation Method 1
the solder joint can be melted by excessive thermal load of the varistor
Implementation Method 2
the fusible conductor can be bridged by an arc developing inside the deion chamber
Implementation Method 3
a deion chamber for arc quenching
Implementation Method 4
a varistor electrically connected in series to the horn spark gap
Data Source
AI summary
The invention relates to an overvoltage protection arrangement consisting of a horn spark gap accommodated in an insulating housing (1) having a deion chamber. A trigger electrode is located in the ignition area of the horn spark gap. A varistor is also present, electrically connected in series to the horn spark gap. According to the invention, a first and a second disconnection apparatus are formed in the housing, wherein the first disconnection apparatus (2) is in heat-conducting connection with the varistor and, when a limit temperature is reached or exceeded, releases a spring-loaded slide (3) which interrupts the series connection between varistor and horn spark gap. Furthermore, the second disconnection apparatus (13) comprises a fusible conductor which is located inside the deion chamber, for example, and can be exposed there to an arc, wherein the fusible conductor holds a spring-loaded disconnector element (14) in a first position and releases this disconnector element (14) when fused as a result of the effects of the arc in such a manner that the disconnector element (14) adopts a second position, wherein an electrical connection to the trigger electrode is interrupted when the second position is reached. A three-pointed, rotatably mounted star or a circular disc with lugs or prongs is formed in the housing such that a first star point (7) is carried along by the slide (3) as it moves to interrupt the series connection. In the same way, a second star point (16) is carried, as the disconnector element (14) moves, from the first to the second position, wherein each movement of the star results in a rotation of the star around its axis of rotation (17) with the consequence that a third point of the star (10) releases a spring-loaded pivoting lever (8) which operates a remote signalling contact (11) and/or a visual fault status display (12).