Capacitive TDR System for Online Cable Anomaly Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transmission cables often suffer premature breakdown due to manufacturing defects and installation errors, leading to financial losses and customer inconveniences, and existing methods require physical tracing and inspection to locate anomalies.
Innovation Solution
A Time Domain Reflectometer (TDR) system that generates a pulse of electrical energy and uses capacitive test sensors to detect impedance changes in energized power cables, allowing for the location and identification of anomalies without disconnecting the cable, using a computing device and pulse generator to analyze reflections and determine anomaly locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical tracing and inspection methods are used to locate cable anomalies, then anomaly detection can be performed, but the system requires cable disconnection and physical access which increases downtime and operational disruption
Solution Approach 1:
The patent replaces mechanical physical inspection methods with electromagnetic field-based detection. The TDR system uses electrical pulses and electromagnetic reflections to detect cable anomalies without physical contact or cable disconnection, thereby eliminating the need for cable downtime while maintaining anomaly detection capability
Solution Approach 2:
The patent introduces an intermediary capacitive coupling mechanism that allows the TDR system to interface with the cable without direct physical connection. The capacitive sensor acts as an intermediary, coupling to the cable through its electric field, enabling pulse transmission and reflection detection without requiring cable disconnection or physical tracing
2Measurement precision
If traditional TDR methods are used with direct cable connection, then accurate impedance measurement is achieved, but the method requires cable disconnection and physical access which reduces operational efficiency
Solution Approach 1:
The patent substitutes direct mechanical/electrical connection with capacitive field coupling. This allows the TDR system to measure cable impedance accurately through electromagnetic field interaction without physical cable disconnection, thereby maintaining measurement precision while improving operational efficiency
Solution Approach 2:
The capacitive sensor serves as an intermediary that enables accurate impedance measurement through field coupling rather than direct connection. This intermediary approach maintains the precision needed for impedance analysis while allowing the cable to remain connected and operational
3Productivity
If on-line capacitive coupling is used to avoid cable disconnection, then operational continuity is maintained, but the coupling complexity and sensor design difficulty increase
Solution Approach 1:
The patent employs a capacitive sensor as an intermediary coupling mechanism that naturally interfaces with the cable's electric field. This approach maintains operational continuity while the sensor's inherent capacitive structure simplifies the coupling design, avoiding complex mechanical or electrical connection mechanisms
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 accurate and non-invasive detection of anomalies in transmission cables, reducing downtime and financial losses by pinpointing faults and damage without the need for physical inspection, improving the reliability and safety of transmission cables.
Implementation Method 1
one or more capacitive test sensors capable of being capacitively coupled to an on-line power component of the electrical power system
Implementation Method 2
A Time Domain Reflectometer (TDR) system that generates a pulse of electrical energy and uses capacitive test sensors to detect impedance changes in energized power cables
Implementation Method 3
When the pulse encounters a change in the impedance of the cable, part of the pulse's energy is reflected back toward the TDR
Data Source
AI summary
A number of TDR systems and testing methods are provided that improve the quality and accuracy of information collected when propagating a signal along a length of cable in order to pinpoint specific anomalies. One or more of the TDR systems includes, for example, a computing device, a pulse generator, and at least one capacitive test sensor. The at least one capacitive test sensor transmits/receives pulses to/from a power system component, such as an insulated power cable, in a capacitive manner.