Grounding Grid Breakpoint Diagnosis via Transient Electromagnetic Detection
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Solution Overview
Problem
Current fault diagnostic techniques for grounding grids in electric power systems rely on design information and often require substation outages, posing safety risks and economic losses due to their reliance on circuit theory, field-circuit methods, and electrochemical methods that are not independent of design drawings and may necessitate excavation.
Innovation Solution
A transient electromagnetic detection method using a system with a transmitting coil and receiving coil to generate and sense electromagnetic fields, allowing for non-excavation breakpoint diagnosis without outage by processing measurement data into longitudinal resistivity cross-section diagrams to determine grid integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior fault diagnostic techniques (circuit theory, field-circuit method, nondestructive testing method, electrochemical method) are used, then diagnostic capability is achieved, but substation outage is required and design information is needed
Solution Approach 1:
The patent replaces traditional electrical measurement methods (amperemeter, voltmeter) with electromagnetic induction-based transient electromagnetic detection. The transmitting coil generates a time-varying magnetic field that induces currents in the grounding grid, and the receiving coil detects the induced magnetic field, enabling non-contact, non-intrusive diagnosis without requiring substation outage.
Solution Approach 2:
The patent introduces the ground as an intermediary medium for electromagnetic wave propagation. The transient electromagnetic signal propagates through the ground to interact with the grounding grid, and the reflected or transmitted signals carry information about grid integrity, enabling diagnosis without direct electrical connection or excavation.
2Reliability
If prior fault diagnostic techniques are used, then diagnostic capability is achieved, but excavation is required
Solution Approach 1:
The patent replaces physical excavation and direct physical contact with the grounding grid with non-contact electromagnetic detection. The transmitting and receiving coils are positioned above the ground surface, and electromagnetic signals penetrate the ground to detect grid conditions, completely eliminating the need for excavation.
Solution Approach 2:
The patent changes the detection parameter from direct electrical measurement (requiring physical contact) to electromagnetic field measurement (non-contact). By measuring the transient electromagnetic response characteristics (amplitude, phase, decay time) of the grounding grid, the system achieves diagnosis without physical access to the grid conductors.
3Productivity
If transient electromagnetic method is used, then non-excavation diagnosis without outage is achieved, but independent of design information is required
Solution Approach 1:
The patent creates a universal detection system that can diagnose grounding grids of different configurations and layouts without requiring design-specific parameters. The transient electromagnetic method responds to the overall electrical characteristics of the grounding grid, making the system adaptable to various grid designs without recalibration or design information input.
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 independent, non-excavation diagnosis of grounding grid breakpoints, reducing economic losses and ensuring safety by analyzing resistivity distribution without requiring design information or substation outages.
Implementation Method 1
starting the transmitter of the transient electromagnetic detection apparatus to generate bipolar rectangular pulse current and establish a primary pulsed magnetic field
Implementation Method 2
observing and sensing a secondary vortex field using the receiving coil of the transient electromagnetic detection apparatus
Data Source
AI summary
A grounding grid breakpoint diagnostic method for a transient electromagnetic method, based on a transient electromagnetic detection apparatus. The method comprises: (101) disposing a test line at a position above a grounding grid to be diagnosed on the ground, and determining coordinates of a detection point; (102) obtaining information about coordinates of the detection point, and coinciding the center of the transient electromagnetic detection apparatus with the coordinates of the detection point; (103) performing, by the transient electromagnetic detection apparatus, measurement along the test line point by point, so as to obtain measurement data; (104) processing, by using diagram forming software, the measurement data to form a longitudinal resistivity cross-section diagram of the detection point according to a preset formula; (105) determining whether a breakpoint occurs at the detection point according to the longitudinal resistivity cross-section diagram. The method does not depend on a design material of a grounding grid, and can implement non-excavation grounding grid breakpoint diagnosis without outage, thereby reducing economic losses in a diagnosis process.