Cable Accessory Monitoring via Low Side Electrode Isolation
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Solution Overview
Problem
Power grid failures are challenging to diagnose due to numerous components and diverse operating conditions, leading to costly downtime, safety risks, and potential liability, with existing methods being time-consuming and inefficient in identifying faulty components.
Innovation Solution
The implementation of cable accessories with integrated monitoring devices that include sensors, communication units, and power harvesting capabilities, allowing for real-time health assessment and predictive failure analysis of electrical equipment, enabling proactive maintenance and operational adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cable accessories with ground conductors electrically connected to the insulation screen are used, then the structural simplicity and ease of manufacture are maintained, but the ability to perform advanced monitoring functions and predict failures is limited
Solution Approach 1:
The cable accessory is divided into electrically isolated segments: the insulation screen (low side electrode) is separated from the ground conductor by a high impedance separator layer. This segmentation allows independent monitoring functions on the insulation screen while maintaining ground reference through the separator, enabling failure prediction without compromising structural integrity.
Solution Approach 2:
A high impedance separator layer is introduced as an intermediary between the insulation screen and ground conductor. This separator layer blocks direct electrical connection while allowing capacitive coupling, enabling the monitoring device to sense insulation degradation through changes in capacitance without creating a direct electrical path that would compromise safety or functionality.
2Measurement precision
If cable accessories include integrated monitoring devices with multiple sensors and communication units, then the ability to detect and predict failures improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The monitoring device integrates multiple sensing functions (partial discharge detection, temperature monitoring, humidity sensing) and communication capabilities into a single unit attached to the cable accessory. This multi-functional integration enables comprehensive condition monitoring without requiring separate devices for each parameter, reducing overall system complexity while improving measurement precision.
Solution Approach 2:
The monitoring device is designed as a compact, nested structure where sensors, processing electronics, and communication modules are housed within a single attachment unit that couples to the cable accessory. This nesting approach consolidates multiple functional components into one integrated package, minimizing space requirements and simplifying installation while maintaining advanced monitoring capabilities.
3Measurement precision
If the insulation screen is electrically isolated from the ground conductor, then the monitoring device can perform accurate condition assessment, but the electrical flow resistance increases
Solution Approach 1:
The high impedance separator layer serves as an electrical intermediary that provides sufficient isolation for accurate monitoring measurements while maintaining controlled capacitive coupling. This allows the monitoring device to detect insulation degradation through capacitance changes without creating excessive electrical resistance that would interfere with normal cable operation or power flow.
Solution Approach 2:
The separator layer's impedance characteristics are specifically designed to provide high electrical isolation for monitoring purposes while allowing controlled capacitive coupling at operating frequencies. By adjusting the separator's dielectric properties and geometry, the system achieves optimal balance between measurement precision and energy loss, enabling accurate health assessment without significant power flow resistance.
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
This solution enables quicker and more accurate identification of potential failures, reducing downtime and safety risks, while optimizing maintenance and operational efficiency of power grids by predicting equipment health and initiating preemptive actions.
Implementation Method 1
the sensor is a capacitive sensor configured to detect changes in capacitance between the low side electrode and ground conductor
Implementation Method 2
a third layer comprising a resistive material configured to resist electrical flow between the second layer and a ground conductor exterior to the third layer
Data Source
AI summary
Techniques, systems and articles are described for monitoring electrical equipment of a power grid and predicting likelihood failure events of such electrical equipment. In one example, a sensing device is configured to couple to an electrical power cable. The sensing device includes a plurality of concentric layers and a monitoring device. The plurality of concentric layers include a first layer, second layer, and third layer. The first layer is configured to concentrically surround a central conductor of the electrical cable and includes an insulating material. The second layer includes a conducting material. The third layer includes a resistive material configured to resist electrical flow between the second layer and a ground conductor exterior to the third layer. The monitoring device includes a sensor and communication unit configured to output data indicative of the sensor data.