Measuring Device Aging State Monitoring via Time Profiles
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Solution Overview
Problem
In electrical energy supply networks, accurately monitoring the aging state of operating devices without interrupting their operation is complex and costly, especially in distribution networks, where online monitoring is uncommon due to high costs and the need for complex synchronization of measurement technologies.
Innovation Solution
A method involving time-controlled detection of measurement values at prescribed sampling rates to generate time profiles, allowing for the identification of diagnosis variables like dissipation factor and characteristic impedance without complex synchronization, using either a single measuring device for proximate points or two devices for distant points, with subsequent synchronization of measurement values to determine the aging state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If online monitoring of aging state is implemented in distribution networks, then the aging state can be monitored in real-time without interrupting operation, but the cost and device complexity increase significantly
Solution Approach 1:
The measuring device is designed to perform multiple functions: it measures both voltage and current at the same time, enables both online monitoring during operation and offline diagnosis by disconnecting the device. This multi-functionality reduces the need for separate specialized equipment for each monitoring mode.
Solution Approach 2:
The patent combines voltage measurement and current measurement capabilities into a single integrated measuring device. By merging these functions and using a unified evaluation method that processes both measurement types, the system achieves comprehensive monitoring with reduced overall system complexity.
2Measurement precision
If complex synchronization technology is used for online monitoring, then measurement accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The evaluation device automatically performs synchronization of measurements taken at different times by detecting characteristic points in the measured curves (such as peaks or zero-crossings). This self-synchronization capability eliminates the need for complex external synchronization hardware or manual calibration procedures.
Solution Approach 2:
The system performs preliminary measurements during normal operation to establish baseline characteristics and synchronization references. These preliminary actions enable the device to automatically align subsequent measurements without requiring complex real-time synchronization during actual monitoring.
3Device complexity
If selected components are monitored instead of the whole operating device, then device complexity is reduced, but the reliability of aging state assessment decreases
Solution Approach 1:
The evaluation method segments the analysis into distinct measurement phases (voltage measurement phase and current measurement phase) that can be performed separately at different times. By combining results from these segmented measurements through the evaluation device, the system achieves comprehensive device assessment without requiring simultaneous monitoring of all components.
Data Source
AI summary
A method identifies a diagnosis variable which indicates an aging state of an operating device in an electrical energy supply network. In the method, first measurement values of at least one measurement variable are detected at a first measuring point of the operating device. Then simultaneously second measurement values of the at least one measurement variable are detected at a second measuring point of the operating device. The diagnosis variable is identified using respective simultaneously detected first and second measurement values. It is proposed that the first and second measurement values are detected in a time-controlled manner in such a way that a signal of the at least one measurement variable is sampled at a prescribed sampling rate at set times and over a set measurement duration so as to generate time profiles of the first and second measurement values.