Grounding Grid Topology Detection Using TMR Sensors in Extreme Cold
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Solution Overview
Problem
Existing methods for detecting the topological structure of a grounding grid are inefficient and inaccurate, especially in extreme cold conditions, due to data loss and increased leakage current, which complicates the measurement of magnetic induction intensity and makes it difficult to reproduce the grid structure accurately.
Innovation Solution
A method using a TMR tunnel magnetoresistance sensor to measure dynamic current values and calculate magnetic induction intensity, allowing for the determination of branch positions and depths by processing derivatives of the magnetic induction intensity, providing a high-precision detection of the grounding grid's topological structure even in extreme cold conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electromagnetic induction methods are used to detect grounding grid structure, then the detection can be performed, but data loss and increased leakage current occur under extreme cold conditions, reducing measurement precision
Solution Approach 1:
The patent replaces traditional electromagnetic induction measurement methods with a TMR (Tunnel Magnetoresistance) sensor-based measurement system. The TMR sensor directly measures magnetic field intensity without relying on complex electromagnetic induction calculations, eliminating data loss and leakage current issues that occur in traditional methods under extreme cold conditions. This substitution of measurement methodology directly resolves the contradiction between measurement precision and reliability in cold environments.
Solution Approach 2:
The patent changes the measurement parameter from indirect electromagnetic induction calculations to direct TMR sensor readings of magnetic field intensity. By using TMR sensors that operate reliably at low temperatures, the system maintains accurate measurements even in extreme cold conditions where traditional methods fail. This parameter change enables both high precision and reliability in cold environments.
2Manufacturing precision
If inverse problem solving methods are used to determine topological structure, then the grounding grid structure can be reproduced, but the solving process becomes complicated and ill-conditioned solutions appear
Solution Approach 1:
The patent substitutes complex inverse problem solving algorithms with a direct measurement approach using TMR sensors. Instead of calculating the topological structure through complicated inverse electromagnetic field problems, the system directly measures magnetic field intensity at multiple points and processes this data to obtain the grounding grid's topological structure. This direct measurement method eliminates ill-conditioned solutions and simplifies the overall process while maintaining high accuracy.
3Measurement precision
If traditional current sensor methods are used in extreme cold conditions, then current measurement can be performed, but heat dissipation increases leakage current and causes data loss
Solution Approach 1:
The patent replaces traditional current sensors that are susceptible to temperature effects with TMR sensors that inherently operate reliably in extreme cold conditions. The TMR sensor measures magnetic field intensity directly without generating heat that would cause leakage current, and its tunnel magnetoresistance mechanism is not affected by cold temperatures. This substitution eliminates the harmful effects of heat dissipation-induced leakage current and data loss while maintaining measurement precision.
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 method enables accurate and efficient detection of the grounding grid's structure with reduced indirect calculation and strong anti-interference capabilities, ensuring reliable operation and safety in substation environments.
Implementation Method 1
a current sensor based on TMR tunnel magnetoresistance
Data Source
AI summary
A method for detecting a topological structure of a grounding grid under extremely cold condition, includes the following steps: in a substation in an extremely cold area, determining a measuring area S on a ground surface of a grounding grid according to the positions of branches and nodes of the grounding grid in a selected area, acquiring dynamic current values of the branches and nodes through a current sensor based on TMR tunnel magnetoresistance, and then indirectly acquiring the magnetic induction intensity of the measuring area S through conversion; calculating moduli of first to third derivatives of magnetic induction intensities; and determining specific positions and laying depths of the branches of the grounding grid according to peak distances between main lobe peaks and side peaks between strong peaks of the moduli. According to the method, the calculation amount is greatly reduced, and the detection method has strong anti-interference.