Equipment Diagnosis With Adaptive Leakage Current Sensor Modes
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Solution Overview
Problem
Existing load equipment diagnosis systems face challenges in accurately and cost-effectively detecting insulation deterioration and component failures due to varying detection sensitivity of leakage current sensors, leading to high costs and unreliable diagnoses when multiple sensors are used or sensitivity adjustments are needed.
Innovation Solution
An equipment diagnosis device and system that includes a leakage current sensor, an equipment condition acquisition unit, an operation mode determination unit, and a diagnosis unit, which dynamically adjusts the operation mode based on equipment conditions to enhance detection sensitivity and reliability, allowing for low-cost and efficient diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple leakage current sensors with different detection sensitivities are arranged to detect various abnormality events, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the detection sensitivity of the leakage current sensor adjustable and changeable based on operation conditions. The control unit dynamically switches between first and second detection sensitivities according to different operation modes, allowing a single sensor to adapt to different diagnostic requirements without requiring multiple fixed-sensitivity sensors.
Solution Approach 2:
The patent changes the detection sensitivity parameter of the leakage current sensor based on operation conditions. By switching between different detection sensitivities (first sensitivity for normal operation, second sensitivity for abnormality diagnosis), the system achieves accurate detection across various conditions using a single sensor rather than multiple sensors with fixed parameters.
2Measurement precision
If multiple leakage current sensors with different detection sensitivities are arranged to detect various abnormality events, then detection accuracy is improved, but cost increases
Solution Approach 1:
The patent makes a single leakage current sensor perform multiple functions by enabling it to operate at different detection sensitivities. The sensor serves both normal operation monitoring and abnormality diagnosis functions by switching between first and second detection sensitivities, eliminating the need for multiple specialized sensors and reducing overall system cost.
Solution Approach 2:
The system dynamically adjusts the detection sensitivity of the single leakage current sensor based on operation modes, allowing it to adapt to different diagnostic requirements. This dynamic capability replaces the need for multiple static sensors, reducing component count and manufacturing cost while maintaining high detection accuracy.
3Measurement precision
If the gain of the booster amplifier is adjusted to change detection sensitivity, then detection sensitivity changes, but ease of operation deteriorates because adjustment is difficult under normal operation conditions
Solution Approach 1:
The patent implements dynamic switching of detection sensitivity through automated control. The control unit automatically switches between first and second detection sensitivities based on detected operation conditions, eliminating the need for manual gain adjustment and making the system easy to operate while maintaining appropriate sensitivity for different conditions.
Solution Approach 2:
The system uses feedback from the operation condition detection unit to automatically adjust the detection sensitivity. When abnormality is detected, the control unit switches to second detection sensitivity; during normal operation, it uses first detection sensitivity. This closed-loop feedback mechanism automates the sensitivity adjustment process, improving ease of operation.
4Adaptability or versatility
If detection sensitivity is frequently changed under normal operation conditions to diagnose various events, then diagnostic capability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements dynamic switching between first and second detection sensitivities based on operation modes detected by the control unit. This automated dynamic adjustment allows the system to adapt to different diagnostic needs without requiring manual intervention, maintaining high diagnostic capability while preserving ease of operation.
Solution Approach 2:
The system performs self-adjustment of detection sensitivity based on its own detected operation conditions. The control unit automatically determines when to switch between sensitivities without external input, making the system self-sufficient and easy to operate while maintaining versatile diagnostic capability across different conditions.
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 system provides low-cost, easy, and highly reliable diagnosis of load equipment by dynamically adjusting the operation mode of the leakage current sensor, improving detection sensitivity and reducing the need for multiple sensors, thereby lowering costs and enhancing diagnostic accuracy.
Implementation Method 1
a sensor of the active type, employing the flux gate method of detecting a change in the magnetic field
Data Source
AI summary
An equipment diagnosis device (100) includes a leakage current sensor (10), an equipment condition acquisition unit (20) to acquire equipment condition as at least either condition of a load equipment (1) or surrounding environment of the load equipment (1), an operation mode determination unit (36) to determine an operation mode of the leakage current sensor (10) at an operation mode for leakage detection in normal times or an operation mode for abnormality diagnosis based on a condition signal outputted from the equipment condition acquisition unit (20), a leakage current sensor drive unit (31), and a diagnosis unit (37) that makes a diagnosis on the load equipment (1) based on a detection signal outputted from the leakage current sensor (10) and the condition signal outputted from the equipment condition acquisition unit (20). When the equipment condition satisfies a switching condition, the operation mode determination unit (36) switches the operation mode of the leakage current sensor (10) to the operation mode for abnormality diagnosis.