CN103151767B - Method for connecting transient equipotential of grounding grid in case of dangerous influence to small-sized communication station caused by strong currents - Google Patents

Abstract

The invention discloses a method for connecting the transient equipotential of the ground network when strong electricity has a dangerous influence on a small communication station. The ground and the protection ground are electrically connected to the grounding bar respectively; 2. A grounding well is set on the side away from the high-voltage transmission system of the small communication office station, and an in-well grounding bar is set in the grounding well, and one end of the grounding bar in the well is connected to the grounding in the small communication office station. The other end is electrically connected to the communication equipment grounding grid in the small communication station; 3. A discharge tube is installed in the grounding well, and one end of the discharge tube is electrically connected to the reinforced ground grid in the building foundation of the small communication station. In-well ground bar electrical connection. The invention has the advantage of adopting the transient equipotential connection method, so that the small communication office can be built at a position close to the high-voltage power transmission system, and avoids the dangerous influence of the high-voltage power transmission system on the small communication office.

Description

The connection method of the transient equipotential of the ground network when the strong current has a dangerous influence on the small communication station

technical field

The invention relates to a connection method for transient equipotential connection of a ground network of a small communication station, in particular to a connection method for a transient equipotential connection of a ground network when strong electricity has a dangerous influence on a small communication station.

Background technique

With the rapid development of communication systems, it is more and more common for small communication bureaus (mobile communication base stations, local telephone module bureaus, access points, etc.) to be located near high-voltage transmission lines and high-voltage substations. The current standards for lightning protection and grounding in the communication industry require the use of joint grounding, that is, the three grounds of the working ground, the protection ground, and the lightning protection ground are integrated into one, and the working ground, protection ground, and lightning protection ground are electrically connected to each other. This grounding method will cause safety problems when the small communication office station is adjacent to the high-voltage transmission system. For example, when a ground fault occurs in the high-voltage transmission system, a huge instantaneous ground potential rise will occur on the ground network, and a high potential will be induced on the ground network of the small communication station through the resistive coupling of the earth. This high potential can have dangerous effects on personnel and communication equipment in small communication stations. In the past, the only way to prevent this dangerous effect was to use the method of distance decoupling, that is, to increase the distance between the small communication office station and the high-voltage power transmission system. However, this will greatly limit the site selection range of small communication bureau stations, resulting in the inability to build small communication bureau stations in many locations.

Contents of the invention

The purpose of the present invention is to provide a connection method of ground network transient equipotential when strong electricity has dangerous influence on small communication station.

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

The connection method of the transient equipotential of the ground network when the strong electricity of the present invention has a dangerous influence on the small communication station comprises the following steps:

1. Set up a grounding bar in the small communication office station, and electrically connect the working ground and protection ground of the communication equipment in the small communication office station to the grounding bar;

2. Set up a grounding well on the side of the small communication station far away from the high-voltage power transmission system, and set an in-well grounding bar in the grounding well. One end of the well grounding bar is electrically connected to the grounding bar in the small communication station, and the other end is connected to the small communication station The communication equipment grounding ground grid electrical connection in the station;

3. Install a discharge tube in the grounding well, one end of the discharge tube is electrically connected to the reinforced ground grid in the foundation of the small communication station building, and the other end is electrically connected to the grounding row in the well.

The advantage of the present invention is that it adopts a transient equipotential connection method, that is, under normal circumstances, the working ground and protection ground of the communication equipment in the small communication station are electrically separated from the reinforced ground net (lightning protection ground net) in the building foundation of the small communication station , which can prevent the dangerous impact of the resistive coupling through the earth on the small communication office station when the high-voltage transmission system occurs a ground short-circuit fault. When the lightning strikes the communication station, the grounding grid of the communication equipment and the reinforced ground grid (lightning protection ground grid) Electrical connection, forming a joint grounding, can also achieve the purpose of preventing lightning strikes from affecting small communication stations; enabling small communication stations to be built near the high-voltage transmission system, while avoiding the impact of high-voltage transmission systems on small communication stations Hazardous effects of stations.

Description of drawings

Fig. 1 is a schematic diagram of a transient equipotential connection structure of a ground network of a small communication office station implemented according to the method of the present invention.

Detailed ways

As shown in Fig. 1, the connection method of the transient equipotential of the ground network when the strong electricity of the present invention has a dangerous influence on the small communication site includes the following steps:

One, the grounding bar 2 is set in the communication station 1, and the working ground and the protection ground of the communication equipment 3 in the small communication station 1 are respectively electrically connected with the grounding bar 2;

Two, the grounding well 5 is set on the side of the small communication station 1 away from the high-voltage power transmission system 4, the distance between the ground well 5 and the small communication station 1, according to the ground potential rise when the high-voltage substation of the high-voltage power transmission system 4 occurs a grounding short circuit accident Calculation and determination of the scope of influence; the grounding bar 6 in the well is set in the grounding well 5, one end of the grounding bar 6 in the well is electrically connected to the grounding bar 2 in the communication station 1, and the other end is connected to the communication equipment in the small communication station 1 3 ground grid 7 electrical connection;

3. A discharge tube 8 is installed in the grounding well 5, one end of the discharge tube 8 is electrically connected to the reinforced ground grid 9 in the building foundation of the communication station 1, and the other end is electrically connected to the grounding bar 6 in the well.

The working principle of the present invention is briefly described as follows:

When lightning strikes the small communication station 1 building, the discharge tube 8 will act to ground the communication equipment 3 in the small communication station 1. The ground grid 7 and the reinforced ground grid 9 (lightning protection ground) network) electrical connection, and the two ground networks are combined into one to form a joint ground to ensure the safety of the communication equipment 3 and staff in the communication station 1. When a grounding short-circuit fault occurs in the high-voltage substation of the high-voltage power transmission system 4, the discharge tube 8 does not operate, because the working ground and protection ground of each communication equipment 3 in the small communication station 1 pass through the grounding bar 6 in the well and the grounding grid 7 of the communication equipment 3 Electrically connected, therefore, the distance between the working ground and protection ground of each communication equipment 3 in the small communication office station 1 and the ground grid 10 of the high-voltage power transmission system 4 increases. At this time, each communication equipment 3 in the small communication office station 1 The ground potential rise value on the working ground and protection ground is smaller than the ground potential rise value on the reinforced ground grid 9 (lightning protection ground grid) in the building foundation of the small communication station 1, that is, the ground grid 10 of the high-voltage transmission system 4 and the communication equipment 3. The distance of the grounding ground grid 7 is within the allowable value of the calculated danger impact of the maximum short-circuit current when a grounding short-circuit fault occurs in the high-voltage substation, so as to achieve the increase in the ground potential of each communication equipment 3 in the small communication station 1. The purpose of not affecting the person and communication equipment 3.

Claims (1)

1. A connection method of ground grid transient equipotential when a strong electricity is dangerously affecting a small communication station, it is characterized in that: comprise the following steps: 1. Set up a grounding bar (2) in the small communication office station (1), and electrically connect the working ground and protection ground of the communication equipment (3) in the small communication office station (1) to the grounding bar (2); 2. Set up a grounding well (5) on the side of the small communication station (1) away from the high-voltage power transmission system (4), and set an in-well grounding bar (6) in the grounding well (5), and the in-well grounding bar (6 ) is electrically connected to the grounding bar (2) in the communication station (1), and the other end is electrically connected to the communication equipment (3) grounding grid (7) in the small communication station (1); 3. Install a discharge tube (8) in the grounding well (5). One end of the discharge tube (8) is electrically connected to the reinforced ground grid (9) in the building foundation of the communication station (1), and the other end is connected to the grounding bar in the well. (6) Electrical connection.