Partial Discharge Location Using Segmented Detection Stations
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Solution Overview
Problem
Existing methods for detecting and locating partial discharges in electrical cables face challenges in reliably identifying signals amidst noise and external disturbances, and accurately determining the source of discharges, especially in long cables, due to signal attenuation and high installation costs.
Innovation Solution
A method involving multiple detection stations along the cable, where sensors capture and process electrical signals to derive phase and shape parameters, separating signals by form and amplitude, and using fuzzy logic to identify partial discharges and correlate data across stations to pinpoint the discharge source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are used to detect partial discharges along the cable, then the reliability of detection is improved, but the device complexity and installation cost increase
Solution Approach 1:
The cable is divided into multiple sections with detection stations positioned at specific intervals. Each detection station independently monitors its section, allowing the system to achieve comprehensive coverage and high reliability without requiring a continuous array of sensors along the entire cable length.
Solution Approach 2:
The patent transitions from temporal signal analysis alone to spatial-temporal analysis by adding the dimension of multiple detection stations positioned at different locations along the cable. This enables both identification and localization of partial discharges simultaneously.
2Measurement precision
If filtering systems are used to remove noise and external disturbances, then the measurement precision is improved, but there is a risk of filtering out useful partial discharge signals
Solution Approach 1:
The system uses adjustable filtering parameters and adaptive signal processing techniques that can be tuned based on the specific operating conditions. This allows optimization of the balance between noise rejection and signal preservation for different cable types and discharge characteristics.
Solution Approach 2:
The detection system incorporates feedback mechanisms where detected signals are analyzed and used to adjust filtering parameters in real-time. This adaptive approach ensures that filtering thresholds are dynamically optimized to prevent both noise interference and loss of useful discharge signals.
3Measurement precision
If synchronized multi-sensor setups are used to locate discharge sources, then the location precision is improved, but the device complexity and cost increase
Solution Approach 1:
The cable route is segmented into multiple detection zones with stations positioned at strategic intervals. By analyzing which segments detect discharges and comparing signal characteristics between adjacent segments, the system achieves accurate localization without requiring synchronized multi-sensor arrays at every possible location.
Solution Approach 2:
Detection stations are pre-positioned at optimal locations along the cable during installation, and signal processing algorithms are pre-configured to automatically compare and correlate signals from different stations. This preliminary setup enables automated discharge source localization without requiring complex real-time synchronization hardware.
4Measurement precision
If detection stations are positioned at multiple locations along the cable, then the ability to locate discharge sources is improved, but the installation cost and complexity increase
Solution Approach 1:
The cable is divided into monitoring sections with detection stations placed at practical intervals based on cable characteristics and expected discharge locations. This segmentation approach achieves effective coverage and localization capability while minimizing the total number of stations required, thereby reducing installation costs.
Solution Approach 2:
Each detection station is designed as a universal, multi-functional unit that can be deployed at any location along the cable. The stations use standardized components and interfaces, allowing flexible installation and reducing overall system cost through economies of scale and simplified maintenance.
Data Source
Figure 1
AI summary
A method for detecting, identifying and locating partial discharges occurring in a discharge site along an electric apparatus comprises the following steps: detecting (1) electrical signals in a detection station; attributing (2) to each detected signal a value of a phase parameter; deriving (3) for each signal at least one shape parameter and one amplitude parameter; separating (4) the set of signals detected into sub¬ sets that are homogeneous relative to the shape parameter; identifying (5) sub-sets related to partial discharges and cataloguing them; repeating the above steps in a plurality of detection stations positioned along the apparatus; correlating (7) the sub-sets of signals detected in different detection stations and catalogued similarly; selecting (8) as a function of the amplitude and shape parameters of a sub-set among the correlated ones and locating (9) the partial discharges related to said sub-sets at the detection station of the selected sub-set. Known methods have poor effectiveness and/or reliability, especially for cables whose length exceeds 1-2 km or, alternatively, they require an excessively complex and costly field implementation.