Voltage Surge Protector with Helicoidal Pressure Release
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Solution Overview
Problem
Current voltage surge protectors for medium and high voltage transmission lines fail to prevent fragmentation and explosion during lightning surges, despite mechanisms like grooves or holes in the insulating housing, as these designs often lead to axial splitting and projectile fragment launch.
Innovation Solution
A voltage surge protector with a helicoidally distributed hole configuration in the insulating housing, each hole having a depth less than the wall thickness, designed to cause a controlled failure and pressure release sideways, preventing explosion and fragment launch, while using a silica sand-based polymerizable composition to prevent moisture ingress and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If grooves or holes are placed axially along the wall of the insulating housing to release pressure, then the outward launching of fragments is reduced, but the protective device splits into fragments that can still be launched outward as projectiles
Solution Approach 1:
The patent applies a helicoidal (screw-shaped) configuration to the arrangement of holes in the insulating housing. Instead of axial alignment, the holes are distributed along a helical path around the housing, creating a curved spatial arrangement that redirects pressure release away from axial fragmentation and prevents projectile launch while maintaining pressure relief functionality
Solution Approach 2:
The invention transitions from a one-dimensional axial arrangement of pressure relief features to a three-dimensional helicoidal distribution. This dimensional change allows pressure to be released through holes positioned at multiple angular locations around the housing, transforming the failure mode from axial splitting to a controlled helical fracture pattern that contains fragments
2Object-affected harmful factors
If the insulating housing is made thick enough to prevent moisture penetration and maintain structural integrity, then protection against moisture is improved, but the device becomes more susceptible to explosion and fragmentation during surge events
Solution Approach 1:
The patent incorporates pressure relief holes into the insulating housing design before surge events occur. These pre-positioned holes provide predetermined weak points that will fracture under surge pressure, preventing uncontrolled explosion. The helicoidal arrangement ensures that when pressure builds up, it releases through a controlled path that maintains structural integrity while preventing moisture ingress during normal operation
Solution Approach 2:
The insulating housing exhibits different structural properties at different locations: the helicoidal hole distribution creates localized regions of controlled weakness for pressure release, while the overall housing maintains sufficient thickness and strength to prevent moisture penetration and contain fragments. Each local region of the housing has optimized properties appropriate to its 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 solution effectively prevents explosion and fragment launch during lightning surges, maintaining structural integrity and compliance with testing standards by distributing pressure through a network of fractures, rather than axial splitting, thus ensuring safety and reliability.
Implementation Method 1
the insulating housing has a hole in a transversal direction for each varistor of the column of varistors inside the insulating housing, the holes being helicoidally distributed along the length of the insulating housing... to release pressure during a voltage surge
Implementation Method 2
the insulating housing prevents penetration of moisture into the column of varistors being composed of 40% to 52% by weight of silica sand
Data Source
AI summary
A voltage surge protector consisting of a plurality of varistors connected in a column, an upper electrode connected to the upper edge of the column of varistors, a lower electrode connected to the lower edge of the column of varistors, an insulating housing that surrounds the column of varistors, a fiberglass cover that surrounds the insulating housing and a weatherproof protective cover provided with barriers mounted on the fiberglass cover. The protector has a mechanism to release pressure during a voltage surge, which consists of a hole in a transversal direction for each varistor of the column of varistors inside the insulating housing, the holes being helicoidally distributed along the length of the housing of insulating material and of a depth less than the thickness of the insulating housing.