Distribution system concentrated ground protection and lightning protection device and system

Abstract

Disclosed is a distribution system concentrated ground protection and lightning protection device and system. The distribution system concentrated ground protection and lightning protection device comprises a power source protection unit and a ground protection unit, an external power source supplies protected devices with power through the power source protection unit, the device ground PE (protecting earthing) ends of the protected devices are connected with a concentrated ground wire through the ground protection unit for grounding, and according to the system, all RRUs (Radio Remote Units) are subjected to concentrated grounding through the concentrated ground wire by all BBUs (Building Base band Units) of more than one protected device. Due to the fact that a concentrated grounding technology is utilized in the distribution system concentrated ground protection and lightning protection device and system, grounding can be performed through alternating current null wires or direct current positive wires, and concentrated grounding can also be achieved through power cable shielded wires or by adding a protective ground wire to a power cable.

Description

technical field [0001] The invention discloses the field of grounding protection and lightning protection, and relates to a centralized grounding protection and lightning protection method and device based on a network distribution system. Background technique [0002] There are millions of lightning strikes in nature every year, and the damage caused by lightning has risen to the third place in natural disasters. In China alone, the number of casualties caused by lightning strikes reaches 3,000 to 4,000 people and property losses reach 5 billion to 10 billion yuan each year. [0003] The scope of lightning disasters covers almost all walks of life. Advanced microelectronic equipment such as measurement, monitoring, protection, communication, and computer network with large-scale integrated circuits as the core components are widely used in electric power, aviation, national defense, communication, radio and television, finance, transportation, petrochemical, medica...

AI Technical Summary

Problems solved by technology

However, due to the existence of soil resistivity, especially in areas with high soil resistivity (such as high mountains), it is very difficult to achieve a grounding device that meets a small grounding resistance, and it is not only necessary to build a large-area grounding grid , using a large amount of steel and drag-reducing agent, and also facing the problem of difficult coordination between the grounding grid construction and the local management department

[0008] (2) The existing grounding technology and lightning protection method is to use the grounding wire to connect with the local grounding device to provide a discharge channel for the lightning current. The remote end in the distribution system

Therefore, the grounding method has brought great trouble to the construction of the network distribution system.

[0009] (3) In the existing grounding technology and lightning protection method, the surge protector (SPD) is connected in parallel with the electronic equipment in the circuit. Due to the grounding resistance in the SPD branch, the SPD branch cannot completely discharge all the lightning current, and it is inevitable There will also be a part of the lightning current intruding into the electronic equipment and affecting the electronic equipment. The degree of influence depends on the ratio of the grounding resistance value to the load characteristic impedance.

[0010] To sum up, the existing grounding technology and lightning protection methods are not only very difficult in engineering implementation, but also difficult to achieve the ideal lightning protection effect

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