阅读说明：本技术 一种新型极低接地电阻接地系统 (Novel extremely low ground resistance grounding system ) 是由 周平 刘春生 冀文涛 梁金宝 朱光武 孙越强 荆涛 张珅毅 安雅雅 孙江桓 于 2021-06-09 设计创作，主要内容包括：本发明公开了一种新型极低接地电阻接地系统,所述系统包括埋入地下的接地体和接地线,所述接地体与接地线下端电连接；其中,接地体包括接地坑、接地板、接地桩和焊接管接地极,所述接地板、接地桩和焊接管接地极均设置于接地坑内,接地桩设置于接地板周围,接地板和接地桩通过焊接管接地极连接。该系统最终实现了接地电阻长期稳定在0.1Ω～0.15Ω之间,实验室极弱信号测量信号系统直接与该接地系统的接地端子箱内的接地端子连接实现测量独立接地效果,实现了fA级极弱电流信号的稳定测量。(The invention discloses a novel extremely-low grounding resistance grounding system, which comprises a grounding body and a grounding wire, wherein the grounding body is buried underground; the grounding body comprises a grounding pit, a grounding plate, a grounding pile and a welded pipe grounding electrode, wherein the grounding plate, the grounding pile and the welded pipe grounding electrode are all arranged in the grounding pit, the grounding pile is arranged around the grounding plate, and the grounding plate is connected with the grounding pile through the welded pipe grounding electrode. The system finally realizes that the grounding resistance is stabilized between 0.1 omega and 0.15 omega for a long time, and the laboratory ultra-weak signal measurement signal system is directly connected with the grounding terminal in the grounding terminal box of the grounding system to realize the independent grounding effect of measurement, thereby realizing the stable measurement of the fA-level ultra-weak current signal.)

1. A novel grounding system with extremely low grounding resistance is characterized by comprising a grounding body and a grounding wire which are buried underground, wherein the grounding body is electrically connected with the lower end of the grounding wire;

wherein the grounding body comprises a grounding pit, a grounding plate, a grounding pile and a welded pipe grounding electrode,

the grounding plate, the grounding pile and the welding pipe grounding electrode are all arranged in the grounding pit, the grounding pile is arranged around the grounding plate, and the grounding plate is connected with the grounding pile through the welding pipe grounding electrode.

2. The novel ultra-low ground resistance grounding system as claimed in claim 1, wherein said grounding plate is a grounding copper plate; the grounding pile is a galvanized grounding pile; the welded pipe grounding electrode is a galvanized flat iron.

3. The novel grounding system with extremely low ground resistance as claimed in claim 2, wherein the length of the grounding pit is 5-20 m, the width is 3-8 m, and the depth is 4-7 m; the length of the grounding copper plate is 5-10 m, the width is 1-3 m, and the thickness is 1-5 mm; the galvanized grounding piles are long round pipes, the number of the galvanized grounding piles is 4, each galvanized grounding pile is 5-10 m long, the diameter of each galvanized grounding pile is 10-30 cm, and the wall thickness of each galvanized grounding pile is 3-5 mm; the galvanized flat iron is 2-5 m long, 3-8 cm wide and 3-5 mm thick.

4. The novel grounding system with extremely low ground resistance as claimed in claim 1, wherein said system further comprises resistance reducing agent, grounding iron powder, grounding clay and water seepage hole; wherein the content of the first and second substances,

laying a resistance reducing agent above and below the grounding plate to form a resistance reducing agent layer; pouring ground iron powder into the ground pile to form a tree-root-shaped rust connector; backfilling grounding clay above the grounding pit; the top of the ground pit is provided with a plurality of ground pit water filling holes, the bottoms of the four sides of the wall of the ground pit are respectively provided with a plurality of water seepage holes, and the height between each water seepage hole and the bottom of the ground pit is 1-3 m.

5. The novel extremely low ground resistance grounding system as claimed in claim 4, wherein the amount of the friction reducer used is 500-700 kg, the length of the friction reducer layer is 5-20 m, the width is 3-8 m, and the thickness is 0.5-1 m; the using amount of the grounding iron powder is 300-700 kg; the area of the grounding clay is 200-400 m³(ii) a The water penetration hole has a length of 0.3-0.4 m and a width of 0.1-0.3 m.

6. The novel grounding system with extremely low ground resistance as claimed in claim 1, wherein said grounding wire comprises an outdoor grounding cable and an insulated grounding terminal box.

7. The grounding system of claim 6, wherein the grounding body is electrically connected to a grounding cable of a grounding wire.

Technical Field

The invention relates to the field of weak current and weak signal measurement, in particular to a novel grounding system with an extremely low grounding resistance.

Background

At present, a ground resistance tester ground megger for measurement and verification is used for carrying out multiple multi-site ground tests, generally, the ground resistance tester ground megger is over 30 omega in sunny days, and the measurement is about 10 omega after rain. Such high ground resistance is attributed to the fact that soil is extremely difficult to retain moisture due to the fact that the local geological conditions are determined by soil geological conditions mainly including cobblestones and gravel, and therefore, the soil is in a dry state for a long time, resulting in an extremely high ground resistance value.

However, the existing device is required to measure the fA level extremely weak current signal, which is almost the limit of the current weak signal measurement, and the measurement system is required to measure the fA level current only under the grounding condition of the stable and extremely low grounding resistance value condition, so that a grounding system capable of meeting the above requirements is urgently needed.

Disclosure of Invention

The invention aims to realize the detection design of fA-level extremely-weak current signals and construct a long-term stable independent grounding system below 0.3 omega.

In order to achieve the above object, the present invention provides a novel grounding system with extremely low grounding resistance, which is composed of a grounding body buried underground and a grounding wire for connection. The grounding body is a key part and is the core of the design.

The system comprises a grounding body and a grounding wire which are buried underground, wherein the grounding body is electrically connected with the lower end of the grounding wire;

wherein the grounding body comprises a grounding pit, a grounding plate, a grounding pile and a welded pipe grounding electrode,

the grounding plate, the grounding pile and the welding pipe grounding electrode are all arranged in the grounding pit, the grounding pile is arranged around the grounding plate, and the grounding plate is connected with the grounding pile through the welding pipe grounding electrode.

Preferably, the grounding plate is a grounding copper plate; the grounding pile is a galvanized grounding pile; the welded pipe grounding electrode is a galvanized flat iron.

Preferably, the length of the grounding pit is 5-20 m, the width of the grounding pit is 3-8 m, and the depth of the grounding pit is 4-7 m; the length of the grounding copper plate is 5-10 m, the width is 1-3 m, and the thickness is 1-5 mm; the galvanized grounding piles are long round pipes, the number of the galvanized grounding piles is 4, each galvanized grounding pile is 5-10 m long, the diameter of each galvanized grounding pile is 10-30 cm, and the wall thickness of each galvanized grounding pile is 3-5 mm; the galvanized flat iron is 2-5 m long, 3-8 cm wide and 3-5 mm thick.

Preferably, the system is characterized by further comprising a resistance reducing agent, grounded iron powder, grounded clay and a water seepage hole; wherein the content of the first and second substances,

laying a resistance reducing agent above and below the grounding plate to form a resistance reducing agent layer; pouring ground iron powder into the ground pile to form a tree-root-shaped rust connector; backfilling grounding clay above the grounding pit; the top of the ground pit is provided with a plurality of ground pit water filling holes, the bottoms of the four sides of the wall of the ground pit are respectively provided with a plurality of water seepage holes, and the height between each water seepage hole and the bottom of the ground pit is 1-3 m.

Preferably, the use amount of the resistance reducing agent is 500-700 kg, the length of the resistance reducing agent layer is 5-20 m, the width is 3-8 m, and the thickness is 0.5-1 m; the using amount of the grounding iron powder is 300-700 kg; the area of the grounding clay is 200-400 m³(ii) a The water penetration hole has a length of 0.3-0.4 m and a width of 0.1-0.3 m.

Preferably, the grounding wire comprises an outdoor grounding cable and an insulating grounding terminal box.

Preferably, the grounding body is electrically connected to a grounding cable of a grounding wire.

Outdoor ground connection cable conductor and indoor insulating earth terminal case realize insulating and independent ground connection purpose, avoid receiving building and other equipment interference and impact.

The invention adopts the resistance reducing measures, including the water locking measures (water seepage holes) of the grounding pit, the backfilling of the grounding pit with high-quality clay (grounding clay), the laying of the long-acting resistance reducing agent from top to bottom of the grounding copper plate, and the pouring of grounding iron powder into the grounding pile to form the tree-root-shaped rust connector. The resistance reduction measures are adopted to realize high-efficiency resistance reduction and stably maintain extremely low grounding resistance for a long time.

The system finally realizes the long-term stability of the ground resistance between 0.1 omega and 0.15 omega, and the laboratory extremely-weak signal measurement signal system is directly connected with the ground terminal in the ground terminal box of the ground system to realize the independent ground effect of measurement, thereby realizing the stable measurement of the fA-level extremely-weak current signal.

Compared with the prior art, the invention has the advantages that:

1. the system is a long-term stable grounding system with an extremely low grounding resistance value, and provides guarantee for realizing accurate detection of fA-level extremely low current signals;

2. the system of the invention has the advantages of simple design method, stable work and long-term reliability;

3. the earth plate, the grounding pile and the welded pipe grounding electrode selected by the system form a composite grounding electrode, the composite grounding electrode system saves the floor area, and long-acting resistance reduction measures are proper, so that the maintenance cost is greatly reduced;

4. the system is an independent grounding terminal and an installation mode of insulating from other electrical systems, and a grounding electrode is independently connected in the system, so that the anti-interference capability is strong.

Drawings

FIG. 1 is a perspective view of the novel ultra-low ground resistance grounding system of the present invention;

FIG. 2 is a top view of the novel ultra-low ground resistance grounding system of the present invention;

reference numerals:

1. the ground pit, 2, the ground copper board, 3, the zinc-plated ground pile, 4, the zinc-plated flat iron joint, 5, the resistance reducing agent, 6, the ground iron powder, 7, the ground clay, 8, the water seepage hole, 9, the ground cable, 10, the ground greening lawn, 11 and the ground pit irrigation hole.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-2, a novel grounding system with extremely low grounding resistance comprises a grounding body buried underground and a grounding wire, wherein the grounding body is electrically connected with the lower end of the grounding wire;

the grounding body comprises a grounding pit 1, a grounding copper plate 2, a galvanized grounding pile 3, a galvanized flat iron 4, a resistance reducing agent 5, grounding iron powder 6, grounding clay 7 and a water seepage hole 8;

the grounding copper plate 2, the galvanized grounding pile 3 and the galvanized flat iron 4 are connected and arranged in the grounding pit 1, the galvanized grounding pile 3 is arranged around the grounding copper plate 2, and the grounding copper plate 2 and the galvanized grounding pile 3 are connected through the galvanized flat iron 4. Laying a resistance reducing agent 5 on the upper and lower parts of the grounding copper plate 2 to form a resistance reducing agent layer; pouring grounding iron powder 6 into the galvanized grounding pile 3 to form a tree-root-shaped rust connector; earth clay 7 is backfilled above the earth pit 1; lay ground greening lawn 10 on ground connection clay 7, be provided with two ground connection hole irrigation holes 11 at the top of ground connection hole, set up a plurality of infiltration holes 8 respectively in ground connection hole pitwall four sides bottom, wherein, length direction sets up two infiltration holes 8, and width direction sets up 1 infiltration hole 8, and the height of infiltration hole 8 apart from the ground connection hole bottom is 1 meter.

The length of the grounding pit 1 is 10m, the width is 5m, and the height is 3 m; the length of the grounding copper plate 2 is 8m, the width is 2m, and the thickness is 3 mm; the galvanized grounding piles 3 are long round pipes, the number of the galvanized grounding piles 3 is 4, each galvanized grounding pile is 7m long, the diameter is 20mm, and the wall thickness is 3 mm; the galvanized flat iron 4 has a length of 2m, a width of 5cm and a thickness of 3 mm. The using amount of the resistance reducing agent 5 is 500kg, the length of the resistance reducing agent layer is 9m, the width of the resistance reducing agent layer is 3m, and the height of the resistance reducing agent layer is 1 m; the using amount of the grounding iron powder 6 is 500 kg; the area of the grounding clay 7 is 200m³(ii) a The water seepage hole has a length of 0.3m and a width of 0.3 m.

The system grounding wire comprises two outdoor five-core thick grounding cables 9 and an insulating grounding terminal box.

The system finally realizes that the grounding resistance is stabilized between 0.1 omega and 0.15 omega for a long time, and the laboratory ultra-weak signal measurement signal system is directly connected with the grounding terminal in the grounding terminal box of the grounding system to realize the independent grounding effect of measurement, thereby realizing the stable measurement of the fA-level ultra-weak current signal.

The actual measurement proves that the method can realize the long-term stability of the grounding resistance less than or equal to 0.3 omega, and meet the requirement of a laboratory on the accurate measurement of fA-level extremely-weak-current weak signals.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or substitutions may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.