Circuit Assembly for Surge Arrester Triggering
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Solution Overview
Problem
Existing overvoltage protection systems, such as spark gaps and multi-electrode gas arresters, face limitations in achieving sufficient protection levels, particularly in low-voltage networks, and are often insensitive to phase-to-phase mains voltage, posing a risk to downstream electronic components. Additionally, they lack effective monitoring and diagnosis capabilities.
Innovation Solution
A circuit arrangement featuring a control and evaluation unit with a pulse recognition stage and microcontroller for rapid detection and control of overvoltage events, utilizing fast-switching rectifiers and power semiconductors like IGBTs or MosFETs, which enables fast activation of surge arresters and includes monitoring and diagnostic functions for load analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional trigger circuits (varistors, gas discharge arresters) are used to ignite spark gaps, then the protection level can be reduced to 1.5 kV, but the response time increases due to voltage gradient dependence and the system becomes insensitive to phase-to-phase mains voltage
Solution Approach 1:
The patent replaces conventional passive trigger circuits (varistors, gas discharge arresters) with an active electronic triggering system using power semiconductors (IGBTs, MosFETs) controlled by a microcontroller. This electronic substitution enables precise timing control and phase-to-phase voltage detection, achieving both fast response time and reliable protection at reduced levels (1.5 kV).
Solution Approach 2:
The system incorporates self-diagnosis and monitoring capabilities where the microcontroller continuously monitors the operational status of power semiconductors and surge arresters, detecting faults and providing diagnostic information without external intervention, ensuring maintained reliability throughout the system lifecycle.
2Duration of action of moving object
If spark gaps are designed with improved response behavior and deion chambers, then the extinguishing capability is enhanced, but the protection level remains insufficient for modern electronic component requirements
Solution Approach 1:
The system performs preliminary detection of overvoltage events using the pulse recognition stage and microcontroller before the surge arrester actually activates. This allows the system to prepare and trigger the discharge precisely when needed, ensuring both rapid response and adequate protection level for sensitive electronic components.
Solution Approach 2:
The patent implements feedback mechanisms where the microcontroller monitors the operational status of surge arresters and power semiconductors, detecting faults and providing diagnostic information. This continuous feedback ensures the system maintains required protection levels and enables timely maintenance before performance degradation occurs.
3Adaptability or versatility
If a circuit arrangement is designed to be insensitive to phase-to-phase mains voltage for universal use, then adaptability to different mains voltages is improved, but the ability to detect and respond to specific overvoltage events is reduced
Solution Approach 1:
The system dynamically adapts to different mains voltage configurations (single-phase, three-phase, different voltage levels) through microcontroller-controlled power semiconductors that can be programmed for specific applications. The pulse recognition stage dynamically detects overvoltage events relative to the configured nominal voltage, maintaining detection accuracy while providing universal adaptability.
Solution Approach 2:
The patent designs a universal circuit arrangement where the same basic hardware configuration can operate with different mains voltages and phase configurations. The microcontroller provides programmable adaptability, allowing the system to function as a single-phase or three-phase surge arrester with different nominal voltages, eliminating the need for multiple specialized designs.
4Loss of information
If monitoring and diagnosis capabilities are added to surge arresters, then the ability to detect operational status and faults is improved, but the device complexity increases
Solution Approach 1:
The patent combines the monitoring and diagnosis functions with the existing control electronics. The microcontroller that already controls power semiconductor switching also performs monitoring and diagnosis of surge arrester status. This integration eliminates the need for separate monitoring circuits, reducing overall complexity while providing comprehensive operational information.
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 solution achieves protection levels below 1 kV with improved response times and adaptability to different nominal voltages, ensuring reliable ignition of surge arresters while reducing component costs and space requirements, and enabling real-time monitoring and diagnosis of overvoltage events.
Implementation Method 1
overvoltage arresters based on spark gap technology... allow the trigger current to flow very quickly into the spark gap
Implementation Method 2
multi-electrode gas arresters... must first cause a spark flashover and ionization between the electrodes of the spark gaps
Data Source
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AI summary
The invention relates to a circuit assembly for electronically actuating triggerable surge arresters, such as spark gaps, multi-electrode gas arresters, or similar means. At least one power semiconductor is activated by a switching stage upon detecting a surge event, and the output side of the power semiconductor is connected to a trigger input of the surge arrester. According to the invention, the switching stage is designed as a control and analysis unit for detecting transient surge events and has first a pulse detection stage which allows a detection of pulses in a level-sensitive or increase rate-dependent manner and second a microcontroller or similar means for evaluating events. The output side of the microcontroller leads to the control input of the power semiconductor, and a quick-switching rectifier is provided between the output of the power semiconductor and the trigger input of the surge arrester.