Related Experiment Video
Updated: Jun 25, 2025
07:43
A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency
Published on: October 5, 2019
21.9K
High-Frequency and High-Current Transmission Techniques for Multiple Earth Electrical Characteristic Measurement
Kuiyuan Zhang1,2, Shulin Yang1, Meng Wang1,2,3
1School of Geophysics and Information Technology, China University of Geosciences Beijing, Beijing 100083, China.
Sensors (Basel, Switzerland)
|May 25, 2024
Summary
This study introduces a high-frequency, high-current transmission technique for multiple earth electrical characteristic measurement systems (MECS). The method significantly boosts transmission current, enhancing exploration resolution for various geological and cultural heritage investigations.
Area of Science:
- Geophysics
- Electrical Engineering
- Earth Science
Background:
- High-resolution earth electrical characteristic measurement is crucial for groundwater exploration, mineral resource detection, and cultural relic investigation.
- Existing multiple earth electrical characteristic measurement systems (MECS) face limitations in enhancing the transmission power of high-frequency transmitters.
- Non-destructive detection capabilities are increasingly important in scientific and heritage exploration.
Purpose of the Study:
- To propose and implement a high-frequency, high-current transmission technique to improve the performance of MECS.
- To enhance the transmission power and current in high-resolution earth electrical characteristic measurement systems.
- To boost the resolution of geophysical exploration techniques.
Main Methods:
- Development of a high-frequency, high-current transmission technique based on adaptive impedance matching.
- Integration of resonant capacitors, a precisely controllable reactor (94% inductance variation), and high-frequency transformers.
- Design and testing of a prototype system operating between 10 and 120 kHz with a peak active power of 200 W.
Main Results:
- The proposed technique significantly increased transmission current, with a maximum increase of 16.7 times (average 10.8 times) compared to circuits without impedance matching.
- Compared to traditional impedance matching, the transmission current increased by a maximum of 10.0 times (average 4.2 times).
- The system demonstrated effective improvement in exploration resolution.
Conclusions:
- The developed high-frequency, high-current transmission technique effectively enhances the transmission capability of MECS.
- Adaptive impedance matching, resonant capacitors, and high-frequency transformers are key components for improving system performance.
- The improved system offers greater potential for high-resolution geophysical and non-destructive exploration.
Keywords:
MECSadaptive impedance matchinghigh frequency and high current transmissionhigh-current precisely controllable reactornear-surface geophysicsMore Related Videos
06:54Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
Published on: August 4, 2023
1.1K
07:44Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
Published on: April 27, 2016
9.5K
Related Concept Videos
01:12Mesh Analysis for AC Circuits
370
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
370
01:27Line Protection with Impedance Relays
79
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
Under normal conditions, low load currents keep the measured...
79
01:27Series Impedances: Three-Phase Line
103
Calculating series impedances for a three-phase overhead line involves evaluating resistances and inductive reactances in a network with three-phase and multiple neutral conductors grounded at regular intervals.
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...
103
01:26Shunt Admittances
122
Shunt admittances play a crucial role in the analysis of transmission lines, particularly for three-phase systems with neutral conductors. When a uniformly charged conductor is positioned above the Earth, it induces an equal but opposite charge on its surface. This interaction creates electric field lines between the conductor and the Earth.
To model this effect, the method of images is employed. This method involves replacing the Earth with an image conductor that mirrors the original...
To model this effect, the method of images is employed. This method involves replacing the Earth with an image conductor that mirrors the original...
122
01:21Three-Phase Short Circuit—Unloaded Synchronous Machine
139
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
139
01:18Fault Types
84
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
84