Marine Electromagnetic Survey Power Cable Voltage Conversion
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Solution Overview
Problem
Existing marine electromagnetic geophysical survey systems face challenges in operating electromagnetic sources at substantial distances and depths in water bodies, requiring efficient power transmission with minimal power loss.
Innovation Solution
A marine electromagnetic survey system comprising a power cable coupled to a head unit with a direct current power supply, which converts high voltage direct current to lower voltage with higher current for electromagnetic antennas deployed in the water, allowing for effective induction of electromagnetic fields at great depths and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high voltage direct current is transmitted through the power cable to the electromagnetic source, then power loss is reduced and inductive reactance effects are minimized, but the system becomes more complex requiring voltage conversion equipment at the source
Solution Approach 1:
A voltage conversion device (rectifier and DC-DC converter) is introduced as an intermediary component at the electromagnetic source to convert the transmitted high voltage DC to the required operating voltage. This mediator enables efficient high voltage transmission over long distances while providing the necessary voltage transformation at the remote source location, resolving the contradiction between reducing power loss and maintaining system simplicity.
2Adaptability or versatility
If the electromagnetic source is operated at substantial distance and depth from the tow vessel, then survey coverage is improved, but power transmission efficiency deteriorates due to cable resistance and inductive effects
Solution Approach 1:
The system transmits electrical power at high voltage and converts it to lower voltage at the electromagnetic source. By changing the voltage parameter during transmission and conversion, the system enables operation at substantial distances and depths while maintaining power transmission efficiency and reducing energy loss in the cable.
3Device complexity
If conventional AC power transmission is used to the electromagnetic source, then the system is simpler to implement, but inductive reactance and capacitance effects increase causing power loss
Solution Approach 1:
The system replaces conventional AC power transmission with high voltage DC transmission. This substitution eliminates inductive reactance and capacitance effects that cause power loss in AC systems, enabling efficient power transmission over long distances to the electromagnetic source despite the increased complexity of voltage conversion equipment.
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 configuration reduces power loss and stray electromagnetic fields, enabling the electromagnetic source to operate efficiently at great depths and distances from the survey vessel, while minimizing inductive reactance and capacitance effects.
Implementation Method 1
conducting direct current to equipment disposed in the body of water from a power supply located away from the equipment
Implementation Method 2
The head unit comprises equipment configured to output a lower voltage at higher current than the source of direct current
Implementation Method 3
at least one electromagnetic antenna coupled to the head unit and configured to receive the output of the head unit
Data Source
AI summary
A marine electromagnetic survey system includes a power cable configured to couple to a power supply at one axial end, and to a head unit at the other end. The power supply includes a source of direct current which is coupled to the power cable. The head unit includes equipment configured to output a lower voltage at a higher current than the source of direct current. At least one electromagnetic antenna is coupled to the head unit and is configured to receive the output of the head unit equipment.