Voltage Surge Protector Mechanical Trip Link
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Solution Overview
Problem
State-of-the-art voltage surge protection devices often fail to ensure continuous power supply due to insufficient protection of protective elements, leading to potential outages when a fault causes the circuit breaker to trip, and users cannot reset the device if voltage surge protection elements are defective.
Innovation Solution
A voltage surge protection device with a mechanical actuation mechanism that connects to an electric switchgear apparatus, using a mechanical control link to trip the apparatus when a protective element fails, ensuring the link remains in a tripped state to prevent reactivation and maintain power supply, incorporating thermal pins and electric fuses for fault detection and actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a circuit breaker is used to protect the voltage surge protection device, then the device can be reset after tripping, but the power supply to the load is interrupted and outage risk increases
Solution Approach 1:
The invention separates the protection functions into two independent systems: a circuit breaker for overcurrent protection that can be reset, and a mechanical actuation system with a control link that permanently blocks the power supply when voltage surge protective elements fail. This segmentation allows the resettable circuit breaker to handle resettable faults while the mechanical link handles irreversible protective element failures, resolving the contradiction between reset capability and power supply continuity.
Solution Approach 2:
The mechanical control link acts as an intermediary between the voltage surge protective elements and the power supply circuit. When protective elements fail, the control link is actuated to mechanically block the power supply, preventing automatic reset and ensuring continuous protection. This intermediary mechanism resolves the contradiction by providing a permanent block that prevents harmful automatic re-energization while allowing the circuit breaker to maintain its resettable function for other faults.
2Reliability
If thermal fuse or circuit breaker is used for protection, then electrical protection is provided, but mechanical separation and fault indication are insufficient
Solution Approach 1:
The invention merges electrical protection (thermal fuse, circuit breaker) with mechanical separation (control link, lever, blocking mechanism) and fault indication into a unified protection system. The mechanical control link provides both the separation function and visual fault indication through its position, while the lever mechanism provides both mechanical blocking and indication. This merging resolves the contradiction by integrating multiple functions into a cohesive system that provides comprehensive protection, clear indication, and operational simplicity.
Solution Approach 2:
The mechanical control link serves multiple functions simultaneously: it provides mechanical separation when protective elements fail, provides visual fault indication through its positioned state, and physically blocks the power supply circuit. The lever mechanism similarly provides both mechanical blocking and fault indication. This multi-functionality resolves the contradiction by eliminating the need for separate components for each function, simplifying the overall system while maintaining comprehensive protection and clear fault indication.
3Ease of operation
If protective elements are allowed to reset automatically, then device operation is simplified, but defective protective elements can cause repeated faults and outages
Solution Approach 1:
The mechanical control link is designed to preemptively prevent automatic reset of defective protective elements. When a protective element fails, the control link is actuated to mechanically block the circuit before any automatic reset can occur. This preliminary anti-action resolves the contradiction by eliminating the possibility of harmful automatic re-energization while allowing legitimate protective elements to function normally, thus preventing fault recurrence without compromising ease of operation for valid reset scenarios.
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 provides enhanced protection against voltage surges, ensuring a high uptime of the electric power supply by preventing the reset of faulty protective elements and maintaining power availability even if one element fails, thereby reducing the risk of installation outages.
Implementation Method 1
at least one protective element is at least one varistor in thermal connection with a thermal pin of the separating means, said pin being connected to the means for mechanical actuation to place the mechanical link in a tripped state following melting of said pin caused by heating of said varistor
Implementation Method 2
at least one protective element is at least a discharge tube in electrical connection with an electrical fuse of the separating means, said fuse being connected to the means for mechanical actuation to place the mechanical link in a tripped state following melting of said fuse caused by an increase of the current in said discharge tube
Data Source
AI summary
The voltage surge protection device comprises at least one protection module designed to be connected to an electric switchgear apparatus. The protection module comprises at least one protective element for protection against voltage surges and separating means connected to at least one protective element to cause an electrical and/or mechanical separation representative of a fault of a protective element following an increase of temperature and/or electric current. The protection module comprises means for mechanical actuation connected to said separating means and comprising a mechanical control link. The electrical control link is placed in a tripped state representative of a fault of at least one protective element when said separating means have caused a separation.