CN2457752Y

CN2457752Y - Earthing device for high soil resistivity area

Info

Publication number: CN2457752Y
Application number: CN 00253193
Authority: CN
Inventors: 孟庆波
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-24
Filing date: 2000-11-24
Publication date: 2001-10-31
Anticipated expiration: 2010-11-24

Abstract

The utility model relates to an earthing device for a high soil resistivity area, belonging to a safety protecting device in a power system. The utility model comprises a flat earthing net which is composed of sliver-shaped rigid metal conductors which are vertically and horizontally connected, and rigid metal electrodes which are at least arranged at the lower parts of nodes at four corners of the flat earthing net and extend into foundation holes. The foundation holes are filled with low conducting medium with a definite pressure. The utility model is provided with an earthing resistor and can satisfy requirements of specification of the electricity industry. An effect on preventing a lightning stroke is good. Investment can be saved. The earthing device is a preferred safety protecting facility which is built on a power station, a transformer substation and an electric network in a high soil resistivity area.

Description

The earthing device in high soil resistivity zone

The utility model relates to the earthing device in a kind of high soil resistivity zone, belongs to the safety guard in the electric power system, is to build first-selected safeguard protection facility on the sending out of rock or high soil resistivity, transformer station and electrical network.The lightning protection that also can be used for other power equipment.

Fast development along with electric utility, project of transmitting and converting electricity also increases severely thereupon, but in order not account for or account for less the arable land, often the trend of high voltage power transmission and transforming circuit, make its road of trying one's best through the mountain area, hills of bare place, transformer station also builds in similar location thereupon, it is the areas that belong to high soil resistivity that a lot of zones are wherein arranged, this has just increased difficulty to engineering construction, for guarantee electrical network and send out, the safe operation of transformer station, just must the corresponding technical measures of taking to reduce earth resistance.Common in the past way has: (1) is with 500 * 600 meters horizontal earth mat method; (2) soil replacement method; (3) buried depth is 2.5 meters, has the earth mat method of earth electrode.The conventional approach of above-mentioned reduction earth resistance, although in electric power networks, follow so far, yet all the power industry that do not reach in various degree requires the regulation requirement of earth resistance in 0.1-0.5 Europe, therefore, forming very high counterattack voltage under the effect of power system accident state or damage to crops caused by thunder causes the accident of power equipment damage and casualties to happen occasionally the safe operation of serious threat electrical network.Simultaneously the not only lightning protection effect of conventional approach of above-mentioned reduction earth resistance is poor, as soil replacement method, and have also have a drawback such as big, the long in time limit cost height of quantities, wait to improve based on the way of the traditional reduction earth resistance of described reason is anxious.

The purpose of this utility model realizes by the following technical solutions, it comprises a horizontal grounding net that is linked to each other and constitute in length and breadth by strip rigid metal conductor, at least the node four jiaos of horizontal grounding nets has the rigid metal electrode that puts in the ground datum hole, and pressure is filled with low conducting medium in the ground datum hole.

Described rigid metal electrode is any one in φ 50 steel pipes, 50 angle steel and φ 30 round steel.

Described low conducting medium is any one slurries in graphite, pulverized coal ash and the bentonite.

The utility model compared with prior art, owing to adopted technical measures and proper construction technology such as deep hole wall manufacturing crackle, the low conducting medium of pressure injection such as horizontal grounding net and a plurality of metal electrodes, and there is earth resistance to reach the regulation requirement of power industry through evidence, anti-lightning strike effective, guarantee the safe operation of electric power networks and power equipment.Reduce investment outlay simultaneously, be beneficial to and apply.

Fig. 1 is a plan structure schematic diagram of the present utility model.

Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1.

Embodiment of the present utility model is described in detail in conjunction with the accompanying drawings, the horizontal grounding net 3 that band steel 2 with 60 * 6 or φ 30 round steel link to each other and constitute in length and breadth, at least the node 3 four jiaos of horizontal grounding nets has the rigid metal electrode 1 that puts in the ground datum hole 5, injects low conducting medium 4 in the ground datum hole 5 under pressure.Described metal electrode 1 is any one in φ 50 steel pipes, 50 angle steel and φ 30 round steel; Described low conducting medium 4 is any one or its mixed serums in graphite, pulverized coal ash and the bentonite.

When the utility model uses, earlier in the related scope of horizontal grounding net 3, by designing requirement need establish bore under the corresponding node of metal electrode 1 in φ 60～φ 130mm, be 20～100 meters ground datum hole 5 deeply, be beneficial to the crackle of low conducting medium 4 infiltrations then in the hole wall manufacturing with common technology, metal electrode is put into ground datum hole 5, pressure injects low conducting medium 4 back sealing of hole mouths, horizontal grounding net 3 fuses with metal electrode 1, then horizontal grounding net 3 is linked to each other with the power equipment ground wire, backfill becomes original ground, can come into operation.

Claims

1, the earthing device in a kind of high soil resistivity zone, it is characterized in that it comprises a horizontal grounding net (3) that is linked to each other and constitute in length and breadth by strip rigid metal conductor (2), at least the node (3) four jiaos of horizontal grounding nets has the rigid metal electrode (1) that puts in the ground datum hole (5), and pressure is filled with low conducting medium (4) in the ground datum hole (5).

2, device according to claim 1 is characterized in that described rigid metal electrode (1) is any one in φ 50 steel pipes, 50 angle steel and φ 30 round steel.

3, device according to claim 1 is characterized in that it being that described low conducting medium (4) is any one slurries in graphite, pulverized coal ash and the bentonite.