Split-Core Sensor Actuation for Safe Partial Discharge Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing online partial discharge testing systems pose safety hazards to operators due to the need for close proximity to energized power cables, limiting access and maneuverability, and are difficult to use with protective coverings that restrict dexterity.
Innovation Solution
A split-core radio-frequency current transformer sensor assembly with an actuation subassembly and biasing member that allows operators to open and close the sensor from a distance using a gripping device, enabling safe and efficient testing of power cables while wearing protective coverings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operators manually position and clamp the split-core sensor around the energized power cable, then the sensor can be installed on the cable, but operators are exposed to electrical shock, electrocution, arc blast, and other serious injury hazards due to close proximity to energized equipment
Solution Approach 1:
The patent introduces a remote actuation mechanism as an intermediary device that allows operators to install and adjust the split-core sensor from a safe distance away from the energized cable. The actuation mechanism includes a handle and linkage system that transmits mechanical motion from the operator's safe position to the sensor clamping mechanism, eliminating the need for operators to place their hands near live electrical components while still enabling proper sensor installation and adjustment
2Reliability
If operators wear protective coverings such as thick protective gloves, then operator safety is improved, but manual dexterity and ease of operation are restricted
Solution Approach 1:
The remote actuation mechanism serves as a mediator that compensates for the reduced dexterity caused by protective gloves. The handle and linkage system provides mechanical advantage and extended reach, allowing operators to perform precise clamping and adjustment operations with greater ease while wearing thick protective gloves, thereby maintaining both safety and operational effectiveness
3Measurement precision
If the sensor is designed to be manually clamped around the energized cable, then the sensor can be positioned accurately, but the operator must be in close proximity to charge-carrying components limiting access and maneuverability
Solution Approach 1:
The actuation mechanism with its handle and linkage system acts as an intermediary that transmits positioning commands from the operator's remote location to the sensor. This allows the operator to accurately position the sensor around the cable while remaining at a safe distance, with the mechanical linkage preserving the precision of manual clamping operations without requiring close physical proximity to the energized equipment
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
Facilitates safe and reliable online partial discharge testing by allowing operators to manipulate the sensor from a safe distance, improving ease of use and reducing the risk of electrical shock or injury, while maintaining accurate and sensitive performance.
Implementation Method 1
The biasing member is configured to pivotally bias the first portion and the second portion of the current transformer sensor toward each other relative to the sensor hinge
Implementation Method 2
Partial discharge sensing can be used to detect deterioration of insulation of power cables by detecting high frequency currents that are created by small gaps, voids, cracks or other degradation in power cable insulation
Data Source
AI summary
An apparatus for online partial discharge testing includes a split-core radio-frequency current transformer sensor, an actuation subassembly, and a biasing member. The current transformer sensor has a first portion, a second portion, and a sensor hinge operably engaged between the first portion and the second portion. The actuation subassembly includes an elongate first member secured to the first portion of the current transformer sensor, a second member secured to the second portion of the current transformer sensor and configured to be movable relative to the first member, and a third member engaged with the second member and configured to translate along a length of the first member. The biasing member is configured to pivotally bias the first portion and the second portion of the current transformer sensor toward each other relative to the sensor hinge, with the biasing member secured relative to the first member.