Segmented Spark Gap Assembly for Sustained Overvoltage Protection
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Solution Overview
Problem
Surge arresters with metal oxide varistors are ineffective in protecting against sustained overvoltage conditions at typical line frequencies, leading to overheating, thermal runaway, and hazardous short circuit faults.
Innovation Solution
A spark gap assembly comprising multiple spark gap segments connected in series, each with a grading circuit, which redistributes voltage and reduces impedance during overvoltage events, preventing thermal runaway and enhancing protection against sustained overvoltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MOV discs are used in surge arresters, then protection against short duration power surges is provided, but protection against sustained overvoltage conditions is ineffective
Solution Approach 1:
The surge arrester is divided into multiple functional segments: MOV discs for short-duration surge protection and a spark gap assembly with multiple gaps for sustained overvoltage protection. Each segment handles specific types of overvoltage conditions, allowing the device to effectively address both short-duration and sustained overvoltage threats that a single component could not handle alone.
2Device complexity
If MOV discs are used alone, then simple structure is maintained, but thermal runaway and short circuit faults occur under sustained overvoltage
Solution Approach 1:
The spark gap assembly acts as an intermediary protective layer between the sustained overvoltage condition and the MOV discs. When sustained overvoltage occurs, the spark gaps ionize and provide a low-impedance path to ground, preventing excessive voltage from reaching the MOV discs and causing thermal runaway, thus protecting the simpler MOV structure from catastrophic failure.
3Reliability
If spark gap assembly is added, then protection against sustained overvoltage is enhanced, but device complexity increases
Solution Approach 1:
The invention merges the spark gap assembly and MOV discs into a single integrated surge arrester unit with a unified housing and coordinated operation. The spark gaps and MOV discs work together as a combined protective system where the spark gaps handle sustained overvoltage and the MOV discs handle short-duration surges, achieving enhanced protection without requiring separate standalone devices.
4Manufacturing precision
If multiple spark gap segments are used, then voltage distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The grading circuits connected in parallel with each spark gap segment equalize the voltage distribution across all gaps. By introducing capacitive and resistive elements that balance the voltage shares, the design achieves uniform voltage distribution across multiple spark gaps, ensuring each gap experiences approximately equal stress and breaks down at predictable voltages, simplifying the manufacturing and assembly process.
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 spark gap assembly effectively limits voltage and current during sustained overvoltages, reducing the risk of thermal runaway and hazardous arcing, while maintaining low power consumption and impedance, thus providing enhanced protection for power systems.
Implementation Method 1
A spark gap assembly includes a plurality of spark gap segments. Each spark gap segment includes a spark gap and a grading circuit electrically connected in parallel with the spark gap.
Implementation Method 2
The first spark gap segment and the second spark gap segment are electrically connected in series with the first spark gap segment
Implementation Method 3
Surge arresters, which provide a current path from a conductor to the ground, offer power systems and components protection against power surges
Data Source
AI summary
A spark gap assembly that includes a first spark gap segment and a second spark gap segment electrically connected in series with the first spark gap segment. The first spark gap includes a first spark gap and a first grading circuit electrically connected in parallel with the first spark gap. The second spark gap segment includes a second spark gap and a second grading circuit electrically connected in parallel with the second spark gap.