High-Voltage Cable End Preparation Without Permanent Test Joints
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Solution Overview
Problem
Conventional high voltage cable testing processes require costly and time-consuming joint installations, necessitating significant preparation and operator effort, with permanent terminations that are not cost-effective for routine testing and result in high replacement costs upon failure.
Innovation Solution
The use of stress control tubing and stress relief mastic to prepare cable ends for testing, eliminating the need for permanent joints and allowing direct connection to a high voltage supply, reducing preparation time and costs while enabling efficient AC and DC testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional joint installations are used for cable testing, then cable continuity and electrical stress control are maintained, but preparation time and costs increase significantly
Solution Approach 1:
The patent employs disposable test joints that are designed for single-use during testing operations. These temporary joints can be quickly installed and removed without the need for permanent installation, significantly reducing preparation time while maintaining testing reliability. The disposable nature eliminates complex permanent termination requirements.
Solution Approach 2:
The testing system is divided into separate modular components including test joints, stress control tubing, and connection elements. This segmentation allows each component to be independently prepared and assembled, reducing overall preparation time while maintaining the integrity and reliability of the complete testing setup.
2Reliability
If permanent terminations are used for cable testing, then electrical stress control is improved, but replacement costs increase upon failure
Solution Approach 1:
The patent utilizes disposable test joints with integrated stress control features that provide adequate electrical stress management during testing. These temporary joints are designed to be replaced after each test, avoiding the high replacement costs associated with permanent terminations while maintaining sufficient stress control for testing purposes.
Solution Approach 2:
The test joints serve as intermediary components between the cable and testing equipment, providing the necessary electrical stress control during the testing process. These intermediate elements can be easily replaced without affecting the cable itself, reducing replacement costs compared to permanent terminations.
3Reliability
If conventional joint installations are used, then cable testing reliability is maintained, but operator effort and complexity increase
Solution Approach 1:
The disposable test joints are designed for quick installation and removal by operators, reducing the effort and complexity associated with conventional permanent joint installations. The simplified design maintains testing reliability while requiring less operator skill and time for installation and preparation.
Solution Approach 2:
The testing system employs dynamic, temporary connections rather than static permanent installations. This allows the test joints to be quickly deployed and removed based on testing requirements, reducing operator effort and simplifying the overall testing process while maintaining reliability during the actual testing operation.
Data Source
AI summary
Cable testing may be provided. A first end of a cable may be prepared using stress control tubing and stress relief mastic. Then the first end of the cable may be directly connected to a high voltage supply. The cable may then be tested.