Grounding System Resistance Measurement via Segmented Current Injection
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Solution Overview
Problem
Existing methods for measuring the resistance parameters of grounding systems often result in missed or wrong measurements due to limited local measurements, failing to accurately assess the reliability of the entire system.
Innovation Solution
A method and system that input a driving current into multiple sections of a grounding system path, measuring response voltages and currents to determine the total resistance parameter using circuit principles like Ohm's law and Kirchhoff's law, ensuring comprehensive assessment of the grounding system's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If local measurement methods are used for grounding system resistance, then measurement simplicity is improved, but measurement precision deteriorates due to inability to detect faults in the entire grounding system path
Solution Approach 1:
The patent divides the grounding system path into multiple sections (first section from grounded apparatus to testing well, second section from testing well to grounding body) and uses multiple testing wells (first and second testing wells) to perform segmented measurements. This allows comprehensive coverage of the entire grounding system path while maintaining operational feasibility through systematic division of measurement tasks.
2Measurement precision
If comprehensive measurement of entire grounding system path is performed, then measurement precision is improved, but device complexity increases due to need for multiple testing wells and measurement configurations
Solution Approach 1:
The patent designs the testing wells and measurement apparatus to serve multiple functions: the first and second testing wells can each perform measurements on different sections of the grounding system path, and the same basic measurement apparatus can be configured for different measurement modes (measuring downlead resistance, measuring grounding body resistance, measuring total path resistance). This multi-functionality reduces the need for entirely separate measurement systems for each measurement task.
3Ease of operation
If traditional single-point measurement is used, then ease of operation is improved, but reliability of fault detection deteriorates due to missed or wrong fault detections
Solution Approach 1:
The patent implements a feedback mechanism where measurement results from multiple sections and multiple testing wells are systematically analyzed to determine the overall status of the grounding system path. The system compares measured resistance values against expected ranges and provides feedback on the reliability of the grounding system, enabling comprehensive fault detection while maintaining operational simplicity through automated analysis.
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 approach accurately measures the total resistance of the grounding system, preventing missed or wrong fault detections, thereby ensuring the long-term reliability and safety of the grounding system.
Implementation Method 1
determining a resistance parameter of the grounding system path according to the driving current, the response voltages and the response current
Implementation Method 2
a current sensing apparatus, connected to a current acquisition input end of the monitor, sleeved on the downlead, and configured to sense a response current flowing through the downlead
Data Source
AI summary
Provided are a method, apparatus and system for measuring a resistance parameter of a grounding system, and a monitoring network. The method comprises: inputting a driving current into a plurality of sections of a grounding system path (S602), wherein the grounding system path comprises at least a grounded apparatus, a grounding body, and a downlead connecting the grounded apparatus and the grounding body; measuring response voltages generated by the plurality of sections, and acquiring a response current flowing through the downlead (S604); and determining a resistance parameter of the grounding system path according to the driving current, the response voltages and the response current (S606).