External Coaxial Surge Isolation for Lightning-Struck Antennas
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Solution Overview
Problem
Current lightning protection systems for outdoor antennas are inadequate as they often rely on traditional ground structures within buildings, allowing DC surges to bypass grounding and potentially damage communications equipment, and lack effective monitoring to determine which antennas were struck.
Innovation Solution
A modular DC surge protection apparatus mounted externally near communications antennas, using a stainless steel enclosure with insulated components and high-capacity polyphasers to redirect electrical surges into grounding bars, effectively dissipating the energy outside the building and allowing for detection of antenna failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional grounding systems inside buildings are used for lightning protection, then equipment can be protected from some surges, but DC surges can bypass the grounding system through conductive paths and damage communications equipment
Solution Approach 1:
The grounding system is extracted from the building interior and relocated to the exterior, where the grounding rods are driven directly into the ground outside the building. This removes the surge protection function from the vulnerable indoor environment and positions it where DC surges cannot bypass through building conductors.
Solution Approach 2:
High-capacity polyphase surge protectors are introduced as intermediary devices between the antenna and the grounding system. These polyphase protectors actively intercept and redirect DC surges before they can bypass the grounding system through conductive paths, serving as a protective mediator in the electrical pathway.
2Reliability
If surge protection devices are installed inside the building, then equipment can be protected, but the system cannot effectively monitor or detect which antennas were struck by lightning
Solution Approach 1:
The grounding system and surge protection devices are pre-configured and positioned outside the building in strategic locations near each antenna. This preliminary positioning enables immediate detection and response to antenna strikes before surges can propagate indoors, allowing for faster identification of affected antennas.
Solution Approach 2:
The system incorporates monitoring capabilities that provide feedback about surge events and antenna conditions. When a lightning strike occurs, the external positioning of protection devices and monitoring equipment enables immediate detection and communication of the strike event, allowing operators to quickly identify which antenna was affected.
3Object-affected harmful factors
If modular external surge protection apparatus is installed, then DC surges can be effectively dissipated outside the building, but the device complexity and installation requirements increase
Solution Approach 1:
The surge protection system is divided into modular segments, with each module handling a specific antenna or group of antennas. Each module includes its own grounding rods, polyphase surge protectors, and monitoring components. This segmentation allows for independent installation, maintenance, and scalability, reducing overall system complexity through standardized modular units.
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 system efficiently shields communications equipment from destructive electrical surges by dissipating them outside the building, enabling immediate identification of affected antennas and facilitating prompt replacement, thus preventing damage and ensuring continuous operation.
Implementation Method 1
redirect the surge energy into a grounding bar... dissipate the surge energy
Implementation Method 2
mounted on a first grounding bar that is electrically isolated from the enclosure... sufficient distance through air space to provide for enough resistance
Data Source
AI summary
The present apparatus, system and method solves the problems of the prior art by enabling substantial dissipation of an electrical energy surge coming from communications antenna which has been struck by lightning. The apparatus is for mounting to an exterior of a building at or near communications antenna also located at the exterior of the building. The apparatus is connected with incoming coaxial cables extending from exterior mounted antenna and with outgoing coaxial cables which extend from the apparatus to communications equipment housed within a communications center. The lighting strike surge travels from antenna, along the incoming coaxial cable and is redirected within the apparatus by polyphasers which trip at capacity to redirect the surge to three separate grounding bars and prevent the surge from continuing along outgoing coaxial cables leading to communications equipment thus safely dissipating surge and shielding communications equipment.