Rail Satellite Antenna Isolation Unit for High-Voltage Protection
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Solution Overview
Problem
Existing wireless communication systems for rail-bound vehicles, particularly those using satellite antennas, face challenges in providing adequate high voltage protection without compromising signal strength and geographical coverage, especially when exposed to high voltage power lines.
Innovation Solution
A high voltage protection unit comprising a fully closed metal box connected to ground via a large cross-sectional ground cable, an isolation transformer with high isolation and frequency, and optical fiber switches, which ensures safe power and data transmission to satellite antennas while preventing high voltage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick copper wires (95 mm²) are used as metallic conductors to ground external equipment for high voltage protection, then high voltage protection capability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent replaces the mechanical/electrical grounding system (thick copper wires) with an optical communication system. Optical fibers transmit data and power without electrical conductors, eliminating the need for large-diameter copper conductors while maintaining protection capability through galvanic isolation between high voltage and low voltage sides.
Solution Approach 2:
The patent introduces optical fibers as an intermediary medium to transfer data and power between the external antenna and the indoor equipment. This intermediary eliminates direct electrical contact, providing galvanic isolation and high voltage protection without requiring thick grounding conductors.
2Productivity
If satellite antennas are mounted on external surfaces of vehicles to increase communication capacity, then communication properties are improved, but exposure to high voltage power lines increases safety risks
Solution Approach 1:
The patent replaces electrical signal transmission through metallic cables with optical fiber transmission. This substitution eliminates the conductive path that would allow high voltage to enter the vehicle, while optical fibers can still transmit communication signals and power through non-conductive means.
Solution Approach 2:
The patent converts the potential harm of high voltage exposure into a benefit by using the high voltage environment as an opportunity to demonstrate the superiority of optical isolation. The system not only protects against high voltage but also enables communication in previously unusable high voltage zones.
3Reliability
If metallic conductors are used to ground external equipment, then high voltage protection is achieved, but signal strength and geographical coverage are compromised
Solution Approach 1:
The patent substitutes electrical grounding with optical isolation, eliminating the signal degradation caused by metallic conductors. Optical fibers do not interfere with electromagnetic signals, allowing full signal strength to be maintained while providing equivalent or superior protection against high voltage.
4Reliability
If communication equipment is mounted inside the vehicle carriage, then safety from high voltage is improved, but communication capacity and flexibility are reduced
Solution Approach 1:
The patent divides the communication system into two segments: an external antenna segment that can be optimally positioned for communication, and an indoor equipment segment that ensures safety. Optical fibers connect these segments, allowing each to perform its function independently without compromise.
Solution Approach 2:
The patent uses optical fibers as an intermediary to connect external communication equipment with indoor processing equipment. This intermediary allows the external antenna to be positioned for optimal communication while the indoor equipment provides safety, with the optical fiber transmitting both data and power without electrical hazard.
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 efficient satellite communication with multiple antennas, enhancing geographical coverage and reducing the risk of signal interference and damage from high voltage contacts.
Implementation Method 1
an isolation transformer having at least 36 kV isolation and an operational frequency of at least 1 kHz
Implementation Method 2
connected to ground via at least one ground cable having a total cross-sectional dimension of at least 80 mm2
Implementation Method 3
a first internal fiber switch connected to an optical fiber for direct or indirect data communication with an external source outside said fully closed metal box
Data Source
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, 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.