CN103762430B - Mobile communication base station transformer lightning protection earthing system - Google Patents

Abstract

The invention discloses a mobile communication base station transformer lightning protection grounding system, which comprises a mobile communication base station grounding network, a base station transformer and a base station transformer grounding network; the base station transformer grounding network has an equilateral triangle structure, and the geometric center point of the equilateral triangle grounding network and The three vertices are connected through a horizontal grounding body; the three-in-one grounding point of the base station transformer is connected to the grounding down conductor of the lightning rod and connected to the geometric center point of the equilateral triangle grounding network; the equilateral triangle grounding network is close to the grounding network side of the mobile communication base station The two vertices of the base station are connected to the two points of the grounding network of the mobile communication base station through a horizontal grounding body; a special high-pass flow lightning arrester for the base station is installed on the high-voltage side of the base station transformer, the neutral point of the base station transformer, the grounding point of the special high-pass flow lightning arrester for the base station, After the shell of the base station transformer is connected to one point, it is connected to the grounding down conductor of the lightning rod. The advantage of the invention is to realize the purpose of effectively preventing the transformer of the base station from being struck by lightning.

Description

Mobile communication base station transformer lightning protection grounding system

technical field

The invention relates to a base station transformer near a mobile communication base station, in particular to a base station transformer lightning protection and grounding system when the distance between the mobile communication base station and the base station transformer is less than 30 meters.

Background technique

At present, many mobile communication base stations of operators are built in the suburbs or in the wild. In recent years, with the development of the mobile communication industry, the scale of mobile communication networks has continued to expand, and the coverage of mobile communication base stations has also expanded from cities and suburbs to mountainous areas and the wild. In order to ensure the power supply to the mobile communication base station, a special base station transformer is needed to convert the 10kV voltage into 380V voltage to supply power to the mobile communication base station. Usually, the base station electric transformer is located next to the mobile communication base station. Because the lightning environment of the mobile communication base station is relatively harsh, the base station transformer or high and low voltage arresters are easily damaged by lightning strikes, resulting in interruption of the power supply of the mobile communication base station or interruption of the operation of the mobile communication base station. It occupies a considerable proportion in mobile communication base station accidents, especially when the distance between the mobile communication base station and the base station transformer is less than 30 meters.

Contents of the invention

The purpose of the present invention is to provide a lightning protection grounding system for a mobile communication base station transformer.

To achieve the above object, the present invention takes the following technical solutions:

The mobile communication base station transformer lightning protection grounding system of the present invention includes a mobile communication base station grounding network, a base station transformer and a base station transformer grounding network; the base station transformer grounding network is an equilateral triangle structure, and the geometrical The center point is electrically connected to the three apexes through a horizontal grounding body; the three-in-one grounding point of the base station transformer is electrically connected to the grounding downconductor of the lightning rod and is electrically connected to the geometric center point of the equilateral triangle grounding network; the equilateral triangle grounding network moves closer to The two vertices on one side of the grounding network of the communication base station are electrically connected to the two points of the grounding network of the mobile communication base station respectively through a horizontal grounding body; The grounding point of the high-pass flow lightning arrester dedicated to the base station and the shell of the base station transformer are electrically connected to one point and then electrically connected to the grounding downconductor of the lightning rod.

The side length of the equilateral triangle grounding grid is more than or equal to 3 meters.

The advantage of the invention is to realize the purpose of effectively preventing the transformer of the mobile communication base station from being struck by lightning.

Description of drawings

Fig. 1 is a grounding schematic diagram of the base station transformer and its high-pass flow lightning arrester dedicated to the base station on the high voltage side of the present invention.

Fig. 2 is a schematic diagram of the electrical connection structure between the base station transformer grounding grid and the mobile communication base station grounding grid according to the present invention.

detailed description

As shown in Figures 1 and 2, the mobile communication base station transformer lightning protection grounding system of the present invention includes a mobile communication base station grounding grid 1, a base station transformer 2 and a base station transformer grounding grid; the base station transformer grounding grid is an equilateral triangle structure, The side length of the equilateral triangular grounding grid 3 is ≥ 3 meters, and its geometric center point 4 is electrically connected to the three vertices 5, 6, 7 through a horizontal grounding body; the three-in-one grounding point of the base station transformer 2 and the grounding lead The downline is electrically connected and electrically connected to the geometric center point 4 of the equilateral triangular grounding grid 3; the two vertices 5,6 on the side of the equilateral triangular grounding grid 3 close to the mobile communication base station grounding grid 1 pass through the horizontal grounding body 9,10 respectively Electrically connected with two points of the mobile communication base station grounding network 1; the base station special high-pass flow lightning arrester 11 is set at the base station transformer 2 high-voltage side, the neutral point of the base station transformer 2, the grounding point of the special high-pass flow lightning arrester 11 of the base station, The casing of the base station transformer 2 is electrically connected to one point and then electrically connected to the grounding down conductor of the lightning rod 8 .

The electrical principle of the lightning protection grounding system of the present invention is briefly described as follows:

The equilateral triangular grounding network 3 of the base station transformer 2 is electrically connected with the grounding network 1 of the mobile communication base station with horizontal grounding bodies 9 and 10, the area of the grounding network formed by it reaches the maximum value, and the grounding resistance reaches the minimum value, which can effectively The lightning current is diffused, which reduces the use of the vertical grounding body 12 of the grounding grid 1 of the mobile communication base station. The base station dedicated high-pass flow lightning arrester 11 has the characteristics of high-pass flow and low residual voltage (8/20μS20kA residual voltage is less than 50kV), and it is not easy to be damaged when lightning strikes (currently mobile communication base stations 13 use civil high-voltage arresters, and the arrester passes Low flow rate, high reference voltage, easy to be damaged by lightning), because the residual voltage is less than 50kV, it can ensure that the transformer insulation will not break down, and save the lightning arrester on the low-voltage side, because the power distribution box of the mobile communication base station 13 is the first The flow rate of the level arrester is much higher than that of the original low-voltage side arrester, so it is not easy to be damaged, which reduces the difficulty of construction and saves expenses. The three-in-one grounding point of the base station transformer 2 is electrically connected to the down conductor of the lightning rod 8. The purpose is to convert the large star connection into a small star connection, so as to improve the position of the reference point and reduce the length of the grounding wire. high reference pressure.

Claims (2)

1. a mobile communication base station transformer lightning protection earthing system, comprises mobile communication base station ground network (1) and base station transformer (2) and base station transformer grounding net; It is characterized in that: described base station transformer grounding net is equilateral triangle structure, geometric center point (4) and three summits (5,6,7) of described equilateral triangle ground network (3) are electrically connected by horizontal grounding objects; The three-in-one earth point of base station transformer (2) and lightning rod (8) down conductor are electrically connected and are electrically connected with the geometric center point (4) of equilateral triangle ground network (3); Equilateral triangle ground network (3) is electrically connected respectively by two points of horizontal grounding objects (9,10) with mobile communication base station ground network (1) near two summits (5,6) of ground network (1) side, mobile communication base station; Arrange base station special high pass flow thunder and lightning lightning arrester (11) in base station transformer (2) high-pressure side, the earth point of the neutral point of base station transformer (2), described base station special high pass flow thunder and lightning lightning arrester (11), the shell of base station transformer (2) are connected electrically to a bit and are electrically connected with described lightning rod (8) down conductor.

2. want the mobile communication base station transformer lightning protection earthing system described in ball 1 according to right, it is characterized in that: the length of side >=3 meter of described equilateral triangle ground network (3).