Rail Vehicle HV Protection Unit for Satellite Antenna Isolation
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Solution Overview
Problem
Existing wireless communication systems for rail-bound vehicles face challenges in providing effective high voltage protection for satellite antennas, especially when exposed to high voltage power lines, which compromise signal strength and geographical coverage.
Innovation Solution
A high voltage protection unit comprising a fully closed metal box connected to ground via a thick ground cable and an isolation transformer with high isolation and frequency, ensuring that high voltage currents are directed through the ground cable, while using an optical fiber for data transmission, thereby protecting the satellite antenna system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick copper wires (95 mm²) are used as a metal cage to encapsulate the antenna and provide high voltage protection, then high voltage protection is improved, but the received signal strength is severely compromised
Solution Approach 1:
The patent divides the protection system into two separate functional components: (1) a metal cage structure that provides high voltage protection and grounding, and (2) an internal antenna system that receives satellite signals. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between protection and signal reception.
Solution Approach 2:
The patent introduces an intermediary structure - the metal cage with mesh configuration - that acts as a protective barrier while allowing electromagnetic signals to pass through. The cage provides high voltage protection through grounding while its mesh structure permits satellite signal penetration, thus mediating between protection requirements and signal reception needs.
2Reliability
If a metal cage is used to protect the antenna from high voltage, then protection is improved, but geographical coverage is restricted
Solution Approach 1:
The patent applies local quality by using a mesh configuration for the metal cage where the spacing and size of mesh openings are specifically designed to allow satellite signals from multiple directions to pass through while maintaining protection. This local structural quality enables both protection and wide geographical coverage.
Solution Approach 2:
The metal cage is designed with a mesh structure that functions similarly to a flexible protective shell, providing high voltage protection while allowing electromagnetic waves to penetrate through the openings. This mesh configuration maintains protection effectiveness while minimizing interference with signal reception from various geographical directions.
3Productivity
If multiple wireless links are used to increase capacity and communication properties, then communication performance is improved, but the need for external satellite antennas mounted on the vehicle roof increases exposure to high voltage risks
Solution Approach 1:
The patent applies beforehand cushioning by pre-installing the metal cage structure around the satellite antenna before the antenna is exposed to high voltage environments. This protective enclosure is in place beforehand to cushion and protect the antenna from high voltage strikes, allowing the antenna to operate safely in environments with multiple wireless communication links.
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
The solution provides reliable and compact high voltage protection, allowing for efficient satellite communication with multiple antennas, enhancing geographical coverage and reducing signal interference, while maintaining signal strength and system reliability.
Implementation Method 1
connected to ground via at least one ground cable having a total cross-sectional dimension of at least 80 mm2
Implementation Method 2
an isolation transformer with high isolation and frequency
Implementation Method 3
using an optical fiber for data transmission
Data Source
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AI summary
The present disclosure relates to a high voltage protection unit for electrically operated rail-bound vehicles, such as trains. The high voltage protection unit comprises a fully closed metal box connected to ground via at least one ground cable having a total cross-sectional dimension of at least 80 mm2, and further, arranged in the fully closed metal box: an isolation transformer having at least 36 kV isolation and an operational frequency of at least 1 kHz; and an internal fiber switch connected to an optical fiber leading to an external fiber switch. The power output from the isolation transformer supplies power to the internal fiber switch and at least one satellite antenna arranged on the roof, and a data cable connects the internal fiber switch and the at least one satellite antenna.