Conductive Boot Shield for Power Tool Corona Discharge Protection
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Solution Overview
Problem
The use of electrically powered tools near high voltage power lines is hindered by the risk of damage from coronal discharge, leading to the reliance on manually operated tools to avoid such damage.
Innovation Solution
A power tool assembly with a conductive housing and a removable protective boot that forms a combined shield with a conductive layer, along with a non-conductive communication link, to protect the tool from coronal discharge and ensure safe operation near high voltage power lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrically powered tools are used near high voltage power lines, then productivity and efficiency are improved, but the risk of damage from coronal discharge increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing a conductive shield enclosure around the power tool components (motor, electronics, battery) before exposure to coronal discharge. The shield is formed by conductive housing walls and conductive boot covers that are electrically connected, creating a protective barrier that prevents harmful electromagnetic effects from reaching internal components, thus enabling safe use near high voltage lines
2Reliability
If manually operated tools are used near high voltage power lines, then the risk of damage from coronal discharge is reduced, but productivity and efficiency deteriorate
Solution Approach 1:
The patent replaces manual mechanical operation with electrically powered tools while maintaining safety through electromagnetic shielding. The conductive shield enclosure substitutes for the manual operation constraint, allowing electric motors and electronic controls to function near high voltage lines without direct human contact, thus restoring productivity while preserving reliability
3Reliability
If a conductive shield is added to protect against coronal discharge, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the protective shield function with existing tool components by making the housing walls conductive and integrating boot covers that wrap around the tool. The conductive elements are combined with the structural housing and protective boots, creating a unified shielded enclosure without adding separate complex shielding systems, thus improving reliability while minimizing complexity increase
4Reliability
If a removable boot with conductive material is added to complete the shield, then protection effectiveness is improved, but ease of operation deteriorates
Solution Approach 1:
The patent segments the protective shield into modular components: a conductive housing with integrated boot covers that can be removed and replaced. The boot covers are designed as separate removable pieces that wrap around the tool housing, allowing easy installation and removal while maintaining the continuous conductive shield when attached, thus balancing protection effectiveness with operational ease
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 safe and efficient operation of power tools near high voltage power lines, reducing the risk of damage and allowing for remote activation, suitable for voltages ranging from 480 volts to over 1 million volts.
Implementation Method 1
The use of electrically powered tools near high voltage power lines is hindered by the risk of damage from coronal discharge
Implementation Method 2
A removable boot is adapted to surround the removeable battery pack upon engagement with the housing. The boot has a second shield as a layer of conductive material which, which installed onto the boot, combines with the first shield to form a combined shield that nominally encloses the power tool and the boot
Implementation Method 3
The communication link includes at least one non-conductive fiber optic cable that extends along a length of the hot stick between the proximal and distal ends
Data Source
AI summary
Apparatus for high voltage power line maintenance and repair. In some embodiments, a power tool has a housing which encloses an electrical load and a control electronics circuit using a first shield as a layer of conductive material which is open at a battery pack receiving slot of the housing configured to receive a removable battery pack. A removable boot surrounds the removeable battery pack and has a second shield as a layer of conductive material which combines with the first shield to form a combined shield that nominally encloses the power tool and the boot. An insulative hot stick supports the power tool at a distal end and a user interface at a proximal end. The user interface includes a communication circuit that communicates with the control electronics circuit via a non-conductive communication link that extends along the hot stick to selectively activate the electrical load.