High-Voltage Cable Cross-Bonded Grounding Defect Detection
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Solution Overview
Problem
Existing methods for detecting defects in high-voltage cable cross-bonded grounding systems are inefficient and can only be performed when the system is dismantled, making them timeliness and practicality issues.
Innovation Solution
A device and method that utilize an AC power supply, signal acquisition device, input and output current test devices, and signal excitation couplers to detect the electrical connection state of the cable cross-bonded grounding system both in power-on and power-off conditions, allowing for efficient defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection methods are used to test the cable cross-bonded grounding system, then the system can be tested for defects, but the test can only be performed when lines are not in service and the cross-bonded grounding system is dismantled, resulting in poor timeliness
Solution Approach 1:
The patent changes the detection parameters by using different test frequencies (ω1 and ω2) to enable detection under different operating conditions. By adjusting frequency parameters, the system can detect defects whether the cable is in service or not, eliminating the need to wait for downtime.
Solution Approach 2:
The patent creates a dynamic detection system that can adapt to different operational states of the cable. The detection method dynamically adjusts based on whether the cable is energized or de-energized, allowing continuous monitoring without requiring system dismantling or shutdown.
2Reliability
If traditional detection methods are used, then defect testing can be performed, but the operation is complex and requires dismantling the cross-bonded grounding system
Solution Approach 1:
The patent segments the detection process into independent measurement stages. By measuring currents at different frequencies separately and then combining the results through calculation, the method simplifies the operational procedure and eliminates the need for physical dismantling of the grounding system.
Solution Approach 2:
The patent introduces an intermediary mathematical model that relates the measured currents at different frequencies to the grounding system parameters. This intermediary calculation layer simplifies the direct measurement process and allows detection without physical access to internal connections.
3Reliability
If the cross-bonded grounding system is dismantled for testing, then defect detection can be performed, but productivity is reduced due to system outage
Solution Approach 1:
The patent enables continuous detection capability by allowing measurements to be taken both when the cable is energized and when it is de-energized. This continuity ensures that detection can be performed at any time without interrupting system productivity or requiring scheduled outages.
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
The method and device enable easy and convenient operation, allowing for high-efficiency defect detection in high-voltage cable cross-bonded grounding systems, filling a gap in existing technical solutions and offering good application prospects.
Implementation Method 1
a signal excitation coupler, installed on coaxial cables of a cross-bonded grounding lead and used for injecting a stable current signal with a frequency F1 different from a power frequency and a field interference frequency into a cable cross-bonded grounding system in a coupled manner
Data Source
AI summary
Disclosed are a device and method for detecting defects of a high-voltage cable cross-bonded grounding system. The method selects a protective grounding box of a cross-bonded grounding system, respectively connects a signal excitation coupler to A-phase, B-phase and C-phase coaxial cables of the protective grounding box, selects a stable signal with a frequency different from a power frequency or a field interference frequency, and tests effective current values and phases responded by the A-phase, B-phase and C-phase coaxial cables when the stable signal with the frequency F1 is injected into the A-phase, B-phase and C-phase coaxial cables of the protective grounding box; and obtains resistances and inductances of branch circuits of the cable cross-bonded grounding system by calculation according to measurement data, and determines if the cable cross-bonded grounding system has a connection defect.