Special equipment for no ground electrode lightening proof

Abstract

The invention discloses an earth wire-free lightning-proof special device, comprising a machine case and an in-case circuit board, where there are power line input and output terminals and signal line input and output terminals on the back panel of the machine case. As the lightning current is introduced from outdoor power lines and signal lines at the same time or partially, there will be a high potential difference formed between the lines, and the invention connected in series in them firstly eliminates arc-generating high voltage by bypass discharge, largely reducing the potential deference between the lines and then extracts a constant value key controlled pulse from the subjective determined to infinite voltage, to trigger to switch off dangerous voltage, and thus the output has no line potential difference, and the invention has the functions of auto detecting, auto identifying, auto controlling, and auto resetting at the same of not damaging the original current and voltage and signal frequency carrier, and thoroughly solves the problem of the power supply and signal making lightning protection and preventing out-of-control high voltage of the electric network.

Description

Technical field [0001] The invention belongs to a lightning protection device for outdoor input wires, and particularly relates to a ground wire-free lightning protection device for outdoor input power lines and signal lines. Background technique [0002] For lightning strikes introduced from outdoor input wires, the existing various lightning protection equipment generally use zinc oxide varistors to discharge the lightning strikes to the ground through the ground wire to achieve the purpose of lightning protection. The disadvantages are: [0003] 1. The zinc oxide varistor is not connected in series but connected in parallel between the 220V zero line of the grid. Therefore, the lightning incoming from the outdoor input wire can still attack the electrical equipment, making it vulnerable to damage and difficult to achieve the purpose of lightning protection. [0004] 2. Varistor is a one-time use component. After being struck by lightning, the resistance of the varistor will dr...

AI Technical Summary

Problems solved by technology

Therefore, the lightning electricity introduced from the outdoor input wire can still attack the electrical equipment, making it vulnerable to damage and difficult to achieve the purpose of lightning protection

[0004] 2. The varistor is a one-time use component

However, the resistance of the ground wire is easy to increase due to corrosion, which makes the lightning protection effect worse, and this fault is not easy to find, leaving hidden dangers. Users have no safety guarantee when using this product

[0006] 4. The existing lightning protection products consume a lot of energy. When many users use this type of product, it is easy to short-circuit the three-phase live wires of the power grid at the same time when lightning strikes, causing damage to power facilities

[0007] 5. The short circuit caused by natural force will blow out the common zero line one after another. At this time, the internal coils of the power meters of each user are connected to each other, which will inevitably turn the 220V low-voltage power grid into a 360V high-voltage power grid, resulting in damage to electrical equipment.

However, all kinds of existing lightning protection products are connected in parallel between the zero and live wires, and there is no function of automatically disconnecting the voltage, resulting in damage to electrical equipment.

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