JPH0737669A - Grounding method for deeply buried earth electrode - Google Patents
Grounding method for deeply buried earth electrodeInfo
- Publication number
- JPH0737669A JPH0737669A JP20294393A JP20294393A JPH0737669A JP H0737669 A JPH0737669 A JP H0737669A JP 20294393 A JP20294393 A JP 20294393A JP 20294393 A JP20294393 A JP 20294393A JP H0737669 A JPH0737669 A JP H0737669A
- Authority
- JP
- Japan
- Prior art keywords
- grounding
- ground
- buried
- electrode
- electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気所、建造物等のノ
イズ発生源からノイズの影響を受けることのない深埋設
接地極の接地法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding method for a deeply buried ground electrode which is not affected by noise from noise sources such as electric stations and buildings.
【０００２】[0002]
【従来の技術】従来、大形の電気所、すなわち発変電
所、開閉所、無線中継所等の接地には、接地電位傾度の
均一化をはかる目的で図８のようなメッシュ状に埋設し
た接地網１１が一般的に採用されている。この接地網１
１は、地絡事故時における電気所所１２内の接地上昇電
位を１０００Ｖ以内程度にするため、抵抗値が０．０３
オーム以下となるよう要求されることがある。なお、図
中の１３は鉄塔、１４は引留め架構、１５は機器架構と
の接続線である。そこで、このような不利な条件のもと
での工事施工を有利にする目的で、図９のような実験を
行い電流値を実測した。図中の１１は地表から０．７〜
１．５ｍの深さに埋設された接地網、１３は鉄塔、１４
は引留め架構、１５は機器架構との接続線、１６はトラ
ンス、１７は遮断器、１８〜２０は鉄塔、２１は送電
線、２２は送電線２１と鉄塔１８〜２０を絶縁する碍
子、２３は架空地線である。この実験では、電気所から
１８Ｋｍの鉄塔２０において、送電線２１よりジャンパ
ー接続線２４を介して電流Ｉを鉄塔２０へ通電した結
果、架空地線２３に分流する電流ｉ2はＩの３４％、地
中を流れて接地網１１に流入する電流ｉ1は６０％、No.
１の鉄塔１８より接地網２に流入する電流ｉ3は約６％
程度であることが判明した。2. Description of the Related Art Conventionally, in the grounding of a large electric power station, that is, a power substation, a switching station, a wireless relay station, etc., it is embedded in a mesh shape as shown in FIG. 8 for the purpose of equalizing the ground potential gradient. The grounding grid 11 is generally adopted. This ground net 1
No. 1 has a resistance value of 0.03 so that the ground rising potential in the electric power station 12 at the time of the ground fault is within about 1000V.
May be required to be below ohms. In the figure, 13 is a steel tower, 14 is a retaining frame, and 15 is a connecting line to the equipment frame. Therefore, for the purpose of making the construction work advantageous under such a disadvantageous condition, an experiment as shown in FIG. 9 was conducted to measure the current value. 11 in the figure is 0.7 to 0.7 from the ground surface.
Grounding net buried at a depth of 1.5 m, 13 is a tower, 14
Is a retaining frame, 15 is a connecting line to the equipment frame, 16 is a transformer, 17 is a circuit breaker, 18 to 20 are steel towers, 21 is a power transmission line, 22 is an insulator for insulating the power transmission line 21 and the steel towers 18 to 20, 23 Is an aerial ground line. In this experiment, as a result of passing a current I from the power transmission line 21 to the steel tower 20 through the jumper connection line 24 in the steel tower 20 18 km from the electric station, the current i 2 shunted to the overhead ground wire 23 is 34% of I, The current i 1 flowing in the ground and flowing into the grounding net 11 is 60%, No.
The current i 3 flowing from the steel tower 18 of No. 1 into the ground network 2 is about 6%.
Turned out to be about.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年の
送電容量の増大に伴い、山間地に電気所が求められる例
が多く、しかも、近年の用地取得難によって、電気所の
スペースも制約を受ける場合が多くなってきた。そのた
め、接地工事現場における地下地質の固有抵抗が大きか
ったり、接地場所が狭いという不利な条件のもとで施工
することが多くなってきた。また、深埋設接地極を埋設
した場合、接地極の埋設位置の近くにノイズを発生する
電気施設や建造物があると、地表近くの裸電線にノイズ
が侵入してしまう。そのため、ノイズの影響を避けよう
とすると、ノイズを発生する電気施設や建造物と充分な
距離を隔てた位置に接地極を埋設しなければならず、埋
設位置が制限されるという問題があった。本発明は上記
問題点を解決するためになされたもので、その目的とす
るところは、地下地質の固有抵抗が大きかったり、接地
場所が狭いという不利な条件のもとでも充分な接地を可
能にするとともに、接地極の埋設位置に制限を受けるこ
とのない深埋設接地極の接地法を提供することにある。However, with the recent increase in power transmission capacity, there are many cases where an electric power station is required in a mountainous area, and moreover, the space of the electric power station is also restricted due to the difficulty of land acquisition in recent years. Is increasing. For this reason, it is becoming more common to carry out construction under the disadvantageous conditions that the specific resistance of the underground geology at the grounding construction site is large and the grounding site is small. Further, when a deeply buried grounding electrode is buried, if there is an electric facility or a building that generates noise near the buried position of the grounding electrode, noise will intrude into the bare wire near the surface of the earth. Therefore, in order to avoid the influence of noise, there is a problem that the grounding electrode must be buried at a position that is separated from the electric facility or structure that generates noise by a sufficient distance, and the buried position is limited. . The present invention has been made to solve the above problems, and its object is to enable sufficient grounding even under the disadvantageous conditions that the specific resistance of underground geology is large or the grounding place is narrow. In addition, there is a need to provide a grounding method for a deep buried grounding electrode that is not restricted by the buried position of the grounding electrode.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、第１の発明は、地表近くにメッシュ状の接地網を埋
設するとともに、この接地網と充分な距離を隔てた位置
に、地表部を絶縁して地中部に単独または複数の深埋設
接地極を埋設し、接地網と深埋設接地極とを電線により
接続したことを特徴とする。In order to achieve the above object, a first aspect of the present invention is to embed a mesh-shaped grounding net near the ground surface and to keep the ground surface at a position separated from the grounding net by a sufficient distance. It is characterized in that the portion is insulated and a single or a plurality of deeply buried grounding electrodes are buried in the ground, and the grounding net and the deeply buried grounding electrode are connected by electric wires.
【０００５】第２の発明は、第１発明において、深埋設
接地極の接地抵抗を接地網の見掛け接地抵抗値以下とし
たことを特徴とする。A second invention is characterized in that, in the first invention, the ground resistance of the deeply buried ground electrode is set to be equal to or less than the apparent ground resistance value of the ground network.
【０００６】第３の発明は、第１または第２の発明にお
いて、接地網の外周部および中央部に複数の電線を近接
させて埋設したことを特徴とする。A third invention is characterized in that, in the first or second invention, a plurality of electric wires are embedded in the outer peripheral portion and the central portion of the grounding network in close proximity to each other.
【０００７】第４の発明は、第１または第２または第３
の発明において、接地網を電気所に埋設するとともに、
深埋設接地極を電気所よりの１以上の引出し・引込み鉄
塔ごとに埋設して鉄塔と接続したことを特徴とする。A fourth invention is the first or second or third invention.
In the invention of, the grounding network is buried in the electric station,
It is characterized in that a deeply buried ground electrode is buried in each of at least one drawer / pull-in tower from an electric power station and connected to the tower.
【０００８】第５の発明は、第４の発明において、接地
網と深埋設接地極との間を架空線により接続したことを
特徴とする。A fifth invention is characterized in that, in the fourth invention, the grounding network and the deeply buried grounding electrode are connected by an overhead wire.
【０００９】第６の発明は、地表部のノイズ発生源の影
響を受けることのない充分な深さに接地極を埋設し、接
地極から地表までの間を絶縁された電線又は絶縁線管等
により絶縁し裸電線等により接続したことを特徴とす
る。A sixth aspect of the present invention is an electric wire or insulated wire tube in which the grounding electrode is buried in a sufficient depth so as not to be affected by a noise generating source on the surface of the ground, and insulated from the grounding electrode to the surface of the ground. It is characterized by being insulated by and connected by a bare wire or the like.
【００１０】[0010]
【作用】第１の発明においては、地表近くに埋設された
メッシュ状の接地網と、地表部を絶縁して地中深くに単
独または複数埋設された深埋設接地極との間隔が大きく
なるように、接地網と深埋設接地極とが電線により接続
される。それにより、故障電流は深埋設接地極側に多く
流れて、その分、接地網の電位上昇が小さくなる。In the first aspect of the present invention, the distance between the mesh-shaped grounding net buried near the surface of the earth and the deeply buried grounding electrode that is buried deeply in the ground by insulating the ground surface is large. The grounding net and the deeply buried grounding electrode are connected by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the potential of the ground network is reduced accordingly.
【００１１】第２の発明においては、深埋設接地極の接
地抵抗が接地網の見掛け接地抵抗値以下とされることに
より、接地網に流れる故障電流が減り、接地網の電位上
昇が抑えられる。In the second aspect of the present invention, the ground resistance of the deep buried ground electrode is set to be equal to or lower than the apparent ground resistance value of the ground network, so that the fault current flowing in the ground network is reduced and the potential rise of the ground network is suppressed.
【００１２】第３の発明においては、接地網の外周部お
よび中央部に複数の電線が近接して埋設されることによ
り、単位面積当たりの埋設電線長が増して接地網の見掛
け接地抵抗値が小さくなる。In the third invention, a plurality of electric wires are buried close to the outer peripheral portion and the central portion of the grounding net, so that the length of the buried electric wire per unit area is increased and the apparent grounding resistance value of the grounding net is increased. Get smaller.
【００１３】第４の発明においては、接地網が電気所に
埋設されるとともに、深埋設接地極が電気所よりの１以
上の引出し・引込み鉄塔ごとに埋設されて鉄塔と接続さ
れる。それにより、引出し・引込み鉄塔で地絡が発生し
た場合に電流は深埋設接地極に流れ、その分接地網に流
れる電流が減り、接地網の電位の上昇が抑えられる。In the fourth aspect of the present invention, the grounding network is buried in the electric station, and the deeply buried grounding electrode is buried in each of the one or more extraction / pulling-in steel towers from the electric station and connected to the steel tower. As a result, when a ground fault occurs in the drawer / pull-in tower, the current flows to the deep buried ground electrode, the current flowing to the ground network is reduced accordingly, and the rise in the potential of the ground network is suppressed.
【００１４】第５の発明においては、第４の発明におけ
る接地網と深埋設接地極との間が架空線により接続され
たことにより、接地網と深埋設接地極との間の抵抗値が
小さくなり接地網の電位上昇がわずかになる。In the fifth invention, the ground wire and the deep-buried ground electrode in the fourth invention are connected by an overhead wire, so that the resistance value between the ground net and the deep-buried ground electrode is small. Therefore, the potential rise of the grounding net becomes slight.
【００１５】第６の発明においては、接地極が充分な深
さに埋設されたことにより、接地極は地表部のノイズ発
生源の影響を受けることがなくなる。また、接地極と地
表部との間を接続する電線も絶縁されているため同様に
ノイズ発生源の影響を受けることがなくなる。それによ
り、接地極の埋設位置は制限されることがなくなり、任
意の位置に深埋設接地極を埋設することが可能になる。In the sixth aspect of the invention, since the grounding electrode is buried in a sufficient depth, the grounding electrode is not affected by the noise generating source on the ground surface. Further, since the electric wire connecting the ground electrode and the ground surface portion is also insulated, it is likewise not affected by the noise generation source. As a result, the buried position of the ground electrode is not restricted, and the deep buried ground electrode can be buried at any position.
【００１６】[0016]
【実施例】以下、図によって本発明の実施例を説明す
る。図１は第１および第２の発明に係る第１の実施例の
説明図である。この実施例は、地表からの深さ０．７〜
１．５ｍの深さに接地網１１を埋設するとともに、接地
網１１から水平距離にして２０〜１００ｍほど離れた位
置に、３本の深埋設接地極２５を地表から２０〜１００
ｍの深さに埋設する。これら深埋設接地極２５は地中で
３本を接続した後、電線２６により接地網１１と接続す
る。また、電線２６は、絶縁することも可能である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions. In this example, the depth from the ground surface is 0.7 to
The grounding net 11 is buried at a depth of 1.5 m, and three deeply buried grounding electrodes 25 are located 20 to 100 m apart from the ground surface at a horizontal distance of 20 to 100 m from the grounding net 11.
Buried to a depth of m. These three deeply buried ground electrodes 25 are connected to the ground network 11 by electric wires 26 after connecting three in the ground. The electric wire 26 can also be insulated.
【００１７】図２は同じく第１および第２の発明に係る
第２の実施例の説明図である。この実施例は、地表から
の深さ０．７〜１．５ｍの深さに接地網１１を埋設する
とともに、接地網１１から水平距離にして１０〜２００
０ｍほど離れた位置に、３本の深埋設接地極２５を地表
から２０〜１００ｍの深さに埋設する。これら深埋設接
地極２５と地表からの深さ０．７〜１．０ｍの深さまで
間を絶縁管２７で被覆した電線２８により接続する。電
線２８は上端で電線２９に接続してから接地網１１と接
続する。なお、絶縁管２７としては、ＶＰまたはＥＰ等
の合成樹脂管を用いる。FIG. 2 is an explanatory view of a second embodiment according to the first and second inventions. In this embodiment, the grounding net 11 is buried at a depth of 0.7 to 1.5 m from the ground surface, and the horizontal distance from the grounding net 11 is 10 to 200.
Three deep buried ground electrodes 25 are buried at a depth of 20 to 100 m from the surface of the earth at a position separated by about 0 m. The deeply buried ground electrode 25 and the ground surface are connected to each other by a wire 28 covered with an insulating tube 27 to a depth of 0.7 to 1.0 m. The electric wire 28 is connected to the electric wire 29 at the upper end and then connected to the ground net 11. As the insulating pipe 27, a synthetic resin pipe such as VP or EP is used.
【００１８】図３は、図１および図２の実施例の等価回
路図である。接地抵抗ＲはＶ／Ｉとして求められるが、
故障電流Ｉが通電される場所からみた接地網１１の接地
抵抗を見掛け抵抗Ｒｍとし、深埋設接地極２５の抵抗を
ＲDとして、抵抗ＲDを抵抗Ｒｍよりも小さく設定する
と、故障電流ｉ2は接地抵抗の小さい深埋設接地極２５
へ流れる。すなわち、接地網１１の端部ＲEの電圧Ｖ
Eは、接地網１１の電圧Ｖmより小さくなり、さらに深埋
設接地極２５の接地効果により接地網１１の電位上昇が
軽減される。FIG. 3 is an equivalent circuit diagram of the embodiment shown in FIGS. 1 and 2. The ground resistance R is calculated as V / I,
If the ground resistance of the grounding net 11 as seen from the place where the fault current I is conducted is set as the apparent resistance Rm, the resistance of the deep buried ground electrode 25 is set as R D , and the resistance R D is set smaller than the resistance Rm, the fault current i 2 Is a deep buried ground electrode 25 with a small ground resistance.
Flows to. That is, the voltage V at the end R E of the ground network 11
E becomes smaller than the voltage V m of the ground net 11, and the potential increase of the ground net 11 is reduced by the grounding effect of the deeply buried ground electrode 25.
【００１９】図４は、第３の発明に係る第３の実施例の
説明図である。図において、接地網３１は、約２０ｍ間
隔で縦横に電線を埋設し、各交差点を接続するとともに
各端部を外周の電線に接続して、電線をメッシュ状に埋
設する。このとき、外周部３２と中心部３３に配設され
る電線をともに３本として、互いに近接して埋設する。
それにより、外周部３２と中心部３３については電線の
接触表面積が単純比較で他の部分の３倍になり、その分
抵抗値が少なくなる。なお、このように、埋設される電
線数を増しても、工事の際の掘削溝の本数は、従来と同
じであるため、工事費はわずかの増加だけですむ。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention. In the figure, the grounding net 31 embeds electric wires vertically and horizontally at intervals of about 20 m, connects each intersection, and connects each end to an electric wire on the outer circumference to embed the electric wires in a mesh shape. At this time, three electric wires are provided in the outer peripheral portion 32 and the central portion 33, and are embedded close to each other.
As a result, the contact surface area of the electric wire in the outer peripheral portion 32 and the central portion 33 is three times that in the other portions in a simple comparison, and the resistance value is reduced accordingly. Even if the number of buried wires is increased in this way, the number of excavation grooves during construction is the same as the conventional one, and therefore the construction cost is only slightly increased.
【００２０】図５は、第４の発明に係る第４の実施例の
説明図である。図において、電気所１２の敷地内に接地
網１１を埋設するとともに、電気所１２から引き出され
た電線を支持する鉄塔１８，１９にそれぞれ上部を絶縁
した深埋設接地極３８，３９を所定深度以上に埋設して
接続する。さらに、それぞれ深埋設接地極３８，３９を
絶縁電線３７を介して接地網１１に接続する。この実施
例では、故障電流ｉ2が接地抵抗の小さい深埋設接地極
３８，３９に流れるため、その分、接地網１１に流れる
電流が減り、電圧の上昇が抑えられる。すなわち、電気
所１２の接地面積が狭かったり、接地網１１が埋設され
た電気所１２下方の地下地質の固有抵抗が大きい場合で
も、故障電流ｉ2の流入による接地網１１の電位上昇が
軽減される。FIG. 5 is an explanatory view of the fourth embodiment according to the fourth invention. In the figure, the grounding net 11 is buried in the site of the electric substation 12, and the deeply buried grounding electrodes 38, 39 having upper portions insulated from the steel towers 18, 19 supporting the electric wires drawn out from the electric substation 12 have a predetermined depth or more. Buried in and connected. Further, the deep-buried ground electrodes 38, 39 are connected to the ground network 11 via the insulated wire 37, respectively. In this embodiment, the fault current i 2 flows through the deep buried ground electrodes 38, 39 having a small ground resistance, so that the current flowing through the ground network 11 is correspondingly reduced and the rise in voltage is suppressed. That is, even if the grounding area of the electric station 12 is small or the specific resistance of the underground geology below the electric station 12 in which the grounding network 11 is buried is large, the potential rise of the grounding network 11 due to the inflow of the fault current i 2 is reduced. It
【００２１】図６は、第５の発明に係る第５の実施例の
説明図である。この実施例は、図５の実施例と同様に、
電気所１２の敷地内に接地網１１を埋設するとともに、
電気所１２から引き出された電線を支持する鉄塔１８，
１９にそれぞれ上部を絶縁した深埋設接地極３８，３９
を所定深度以上に埋設して接続する。さらに、鉄塔１
８，１９上に架空電線４０が架設して、それぞれ鉄塔１
８，１９と接続するとともに電気所１２内において接地
網１１に接続する。この実施例は、図５の実施例におけ
る絶縁電線３７を架空電線４０に置き換えたものであ
り、同様な効果が得られるとともに、電気所１２、鉄塔
１８，１９の間が地形的に電線を埋設できない場合に有
効である。FIG. 6 is an explanatory view of a fifth embodiment according to the fifth invention. This embodiment is similar to the embodiment of FIG.
In addition to burying the grounding net 11 in the site of the electric station 12,
A steel tower 18 supporting electric wires drawn from the electric power station 12,
The deep buried grounding electrodes 38 and 39 with their upper parts insulated from each other
Is buried to a predetermined depth or more and connected. Furthermore, the steel tower 1
The overhead electric wires 40 are erected on 8 and 19, and the steel tower 1
8 and 19, and also to the grounding network 11 in the electric station 12. In this embodiment, the insulated wire 37 in the embodiment of FIG. 5 is replaced with an overhead wire 40, and the same effect is obtained, and the wire is topographically buried between the electric station 12 and the towers 18 and 19. It is effective when you cannot do it.
【００２２】図７は第６の発明に係る第６の実施例の説
明図である。図において、１は建造物であり、２は接地
を必要とする電気設備である。電気設備２を接地するた
め、地盤Ｇの表面からＬ１の深さのところに長さＬ２の
接地極３を埋設し、接地極３と電気設備２との間を電線
５により接続するとともに、接地極３から地表までの電
線５の周囲をＶＰ、ＥＰ等（合成樹脂管）４により被覆
し電気的に絶縁する。FIG. 7 is an explanatory diagram of a sixth embodiment according to the sixth invention. In the figure, 1 is a building, and 2 is an electrical installation that requires grounding. In order to ground the electric equipment 2, a grounding electrode 3 having a length L2 is embedded at a depth L1 from the surface of the ground G, and the grounding electrode 3 and the electric equipment 2 are connected by an electric wire 5 and grounded. The periphery of the electric wire 5 from the pole 3 to the surface of the earth is covered with VP, EP or the like (synthetic resin pipe) 4 and electrically insulated.
【００２３】この図では建造物等１の地中部からノイズ
や異常電圧Ｎが発生するものとしており、ノイズ発生源
である建造物等１の最下部から接地極３までの距離Ｄ
は、ノイズＮの影響が接地極３に及ばない距離とする。
通常、距離Ｄは５ｍ以上であって、しかも接地極３の埋
設深さＬ１は、４〜５００ｍである。また、接地極３の
長さもＬ２も５〜５００ｍの範囲とする。このように、
電線５と地盤Ｇとの間がＶＰ４により絶縁されたことに
より、ノイズＮの発生する建造物１の近くに電線５が埋
設されても、電線５にノイズや異常電圧Ｎが侵入または
伝播することが防止される。In this figure, noise and an abnormal voltage N are generated from the underground portion of the building 1 and the distance D from the bottom of the building 1 which is the noise source to the ground electrode 3
Is a distance such that the influence of the noise N does not reach the ground electrode 3.
Usually, the distance D is 5 m or more, and the buried depth L1 of the ground electrode 3 is 4 to 500 m. Further, both the length of the ground electrode 3 and L2 are in the range of 5 to 500 m. in this way,
Since the electric wire 5 is insulated from the ground G by the VP 4, even if the electric wire 5 is buried near the building 1 where the noise N is generated, noise or an abnormal voltage N may penetrate or propagate into the electric wire 5. Is prevented.
【００２４】それにより、接地極３の埋設位置がノイズ
Ｎのために制限されることがなくなり、建造物１の近く
にも埋設することが可能となって地上の配線工事が短距
離となり、工事費をその分削減することが可能になる。
なお、電線５には、最初から被覆・絶縁されているＰＶ
Ｃ又はＣＥや電線等を用いることも可能である。その場
合は、絶縁管ＶＰ等４の設置が不要となり、さらに工事
が容易になる。As a result, the buried position of the ground electrode 3 is not restricted by the noise N, and the ground electrode 3 can be buried near the building 1, which shortens the wiring work on the ground. The cost can be reduced accordingly.
The electric wire 5 is PV that is covered and insulated from the beginning.
It is also possible to use C or CE, an electric wire, or the like. In that case, the installation of the insulating pipe VP or the like 4 is unnecessary, and the construction is further facilitated.
【００２５】[0025]
【発明の効果】以上述べたように第１の発明によれば、
地表近くにメッシュ状に接地網を埋設するとともに、こ
の接地網と充分な距離を隔てた位置に、地表部を絶縁し
て地中部に単独または複数の深埋設接地極を埋設し、接
地網と深埋設接地極とを電線により接続する。それによ
り、故障電流は深埋設接地極側に多く流れて、その分接
地網の電圧上昇が小さくなる。As described above, according to the first invention,
A grounding mesh is buried near the surface of the ground, and the ground surface is insulated at a sufficient distance from this grounding net to bury one or more deeply buried grounding electrodes in the ground. Connect to the deep buried ground electrode by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the voltage of the ground network is reduced accordingly.
【００２６】第２の発明によれば、第１発明における深
埋設接地極の接地抵抗を接地網の見掛け接地抵抗値以下
としたことにより、故障電流が深埋設接地極側に確実に
多く流れて、その分、接地網の電圧上昇がより小さくな
る。According to the second invention, since the ground resistance of the deep buried ground electrode in the first invention is set to be equal to or smaller than the apparent ground resistance value of the ground network, a large amount of fault current flows to the deep buried ground electrode side without fail. Therefore, the voltage rise of the ground network becomes smaller accordingly.
【００２７】第３の発明によれば、第１または第２の発
明における接地網の外周部および中央部に複数の電線を
近接させて埋設したことにより、単位面積当たりの埋設
電線長が増して接地網の見掛け接地抵抗値が小さくな
る。According to the third invention, by embedding a plurality of electric wires close to each other in the outer peripheral portion and the central portion of the grounding net in the first or second invention, the embedded electric wire length per unit area is increased. The apparent ground resistance value of the ground network is reduced.
【００２８】第４の発明によれば、第１または第２また
は第３の発明において、接地網を電気所に埋設し、深埋
設接地極を電気所よりの１以上の引出し・引込み鉄塔ご
とに埋設して鉄塔と接続したことにより、故障電流は深
埋設接地極に流れ、その分接地網に流れる電流が減り、
接地網の電位の上昇が抑えられる。すなわち、接地面積
が狭かったり、地下地質の固有抵抗が大きいようなとこ
ろであっても接地網の接地能力が補完されることにより
電気所の設置が可能になる。According to a fourth aspect of the present invention, in the first, second or third aspect, the grounding net is buried in the electric station, and the deep buried grounding electrode is provided for each of the one or more extraction / pull-in towers from the electric station. By burying it and connecting it to the steel tower, the fault current flows to the deep buried grounding electrode, and the current flowing to the grounding network is reduced accordingly.
The rise of the potential of the grounding net is suppressed. That is, even in a place where the grounding area is small or the underground geology has a large specific resistance, the grounding capacity of the grounding network is supplemented, so that an electric station can be installed.
【００２９】第５の発明によれば、第４の発明におい
て、接地網と深埋設接地極との間を架空線により接続し
たことにより、その分、接地網と深埋設接地極との間の
抵抗値が小さくなり電位上昇がわずかになる。According to the fifth invention, in the fourth invention, the ground network and the deep-buried ground electrode are connected by an overhead wire, so that the ground network and the deep-buried ground electrode are connected by that amount. The resistance becomes smaller and the potential rises slightly.
【００３０】第６の発明によれば、深埋設された接地極
と地表部との間を絶縁された電線により接続したため、
ノイズや異常電圧発生源の影響を受けることがなくな
り、接地極の埋設位置が制限されなくなる。その結果、
この工法を用いれば、接地を必要とする電気施設の最短
距離の位置に接地極を埋設することが可能となり、工事
費を節減することができる。According to the sixth aspect of the invention, since the deeply buried grounding electrode and the ground surface are connected by an insulated wire,
It is not affected by noise or an abnormal voltage generation source, and the buried position of the ground electrode is no longer restricted. as a result,
By using this construction method, it becomes possible to bury the grounding electrode at the position of the shortest distance of the electric facility that requires grounding, and it is possible to reduce the construction cost.
【図１】第１および第２の発明に係る第１の実施例の説
明図である。FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions.
【図２】第１および第２の発明に係る第２の実施例の説
明図である。FIG. 2 is an explanatory diagram of a second embodiment according to the first and second inventions.
【図３】図１および図２の実施例の動作を説明する等価
回路図である。FIG. 3 is an equivalent circuit diagram illustrating the operation of the embodiment of FIGS. 1 and 2.
【図４】第３の発明に係る第３の実施例の説明図であ
る。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention.
【図５】第４の発明に係る第４の実施例の説明図であ
る。FIG. 5 is an explanatory diagram of a fourth embodiment according to the fourth invention.
【図６】第５の発明に係る第５の実施例の説明図であ
る。FIG. 6 is an explanatory diagram of a fifth embodiment according to the fifth invention.
【図７】第６の発明に係る第６の実施例の説明図であ
る。FIG. 7 is an explanatory diagram of a sixth embodiment according to the sixth invention.
【図８】従来の電気所における接地の説明図である。FIG. 8 is an explanatory diagram of grounding in a conventional electric station.
【図９】従来の電気所および送電路における接地電流測
定実験を示す説明図である。FIG. 9 is an explanatory diagram showing a ground current measurement experiment in a conventional electric station and power transmission path.
１ 建造物 ２ 電気設備 ３ 接地極 ４ ＶＰ ５ 電線 １１ 接地網 １２ 電気所 １８，１９ 鉄塔 ２５ 深埋設接地極 ２６ 電線 ２７ 絶縁管 ２８ 電線 ２９ 電線 ３１ 接地網 ３２ 外周部 ３３ 中心部 ３７ 絶縁電線 ３８，３９ 深埋設接地極 ４０ 架空電線 Ｄ ノイズ源から接地極までの距離 Ｇ 地盤 Ｌ１ 接地極深さ Ｌ２ 接地極長さ 1 Building 2 Electrical Equipment 3 Grounding Electrode 4 VP 5 Electric Wire 11 Grounding Network 12 Electricity Station 18, 19 Steel Tower 25 Deep Buried Grounding Electrode 26 Electric Wire 27 Insulating Tube 28 Electric Wire 29 Electric Wire 31 Grounding Net 32 Outer Part 33 Center Part 37 Insulating Electric Wire 38 , 39 Deep buried grounding pole 40 Overhead electric wire D Distance from noise source to grounding pole G Ground L1 Grounding pole depth L2 Grounding pole length
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年２月１６日[Submission date] February 16, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００３[Name of item to be corrected] 0003
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年の
送電容量の増大に伴い、山間地に電気所等が建設される
例が多くなり、しかも、近年その用地取得難によって、
電気所のスペースも制約を受ける場合が多くなってき
た。そのため、接地工事現場における地下地質の固有抵
抗が大きかったり、接地場所が狭いという不利な条件の
もとで施工することが多くなってきた。また、電気設備
技術基準には、接地線の地下絶縁深さが０．７５ｍと規
程されているが、このように浅い深さから深埋設接地極
を埋設した場合、接地極の埋設位置の近くにノイズを発
生する電気施設や建造物があると、地表近くの接地線用
裸電線や接地極にノイズが侵入してしまう。そのため、
ノイズの影響を避けようとすると、ノイズを発生する電
気施設や建造物とノイズが浸入しない充分な距離を隔て
た位置に接地極を埋設しなければならず、埋設位置が制
限されるという問題があった。本発明は上記問題点を解
決するためになされたもので、その目的とするところ
は、地下地質の固有抵抗が大きかったり、接地場所が狭
いという不利な条件のもとでも充分な接地を可能にする
とともに、接地極の埋設位置に制限を受けることのない
深埋設接地極の接地法を提供することにある。The object of the invention is to, however, by recent due to the transmission capacity of increase, example of an electric station or the like in mountainous areas will be built is increased, moreover, in recent years its land acquisition flame,
In many cases, the space of electric stations is also restricted. For this reason, it is becoming more common to carry out construction under the disadvantageous conditions that the specific resistance of the underground geology at the grounding construction site is large and the grounding site is small. Also, electrical equipment
The technical standard stipulates that the underground insulation depth of the ground wire is 0.75 m.
Has been extent, when buried deep buried ground electrode from such shallow depth, if there is electric facilities and buildings generate noise near the buried position of the ground electrode, the ground near the ground line < br /> Noise enters the bare wire and the grounding electrode . for that reason,
In order to avoid the influence of noise, the grounding electrode must be buried at a position separated by a sufficient distance so that the noise does not enter the electric facility or building that generates noise, which limits the buried position. there were. The present invention has been made to solve the above problems, and its object is to enable sufficient grounding even under the disadvantageous conditions that the specific resistance of underground geology is large or the grounding place is narrow. In addition, there is a need to provide a grounding method for a deep buried grounding electrode that is not restricted by the buried position of the grounding electrode.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１１[Correction target item name] 0011
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１１】 第２の発明においては、深埋設接地極の
接地抵抗が接地網の見掛け接地抵抗値以下とされること
により、接地網に流れる故障電流が減小し、接地網の電
位上昇が抑制される。In the second aspect of the present invention, the ground resistance of the deep buried ground electrode is set to be equal to or lower than the apparent ground resistance value of the ground network, so that the fault current flowing in the ground network is reduced and the potential increase of the ground network is suppressed. To be done.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１３[Correction target item name] 0013
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１３】 第４の発明においては、接地網が電気所
に埋設されるとともに、深埋設接地極が電気所よりの１
以上の引出し・引込み鉄塔ごとに埋設されて鉄塔と接続
される。それにより、引出し・引込み鉄塔で地絡が発生
した場合に電流は深埋設接地極に流れ、その分接地網に
流れる電流が減小し、接地網の電位の上昇が抑制され
る。In the fourth aspect of the invention, the grounding network is buried in the electric station, and the deeply buried ground electrode is 1
Each of the above drawer / pull-in towers is buried and connected to the tower. As a result, when a ground fault occurs in the drawer / pull-in tower, the current flows to the deep buried ground electrode, the current flowing to the ground network is reduced accordingly, and the rise in the potential of the ground network is suppressed .
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１６[Correction target item name] 0016
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１６】[0016]
【実施例】以下、図によって本発明の実施例を説明す
る。図１は第１および第２の発明に係る第１の実施例の
説明図である。この実施例は、地表からの深さ０．７〜
１．５ｍ程度又は以上の深さに接地網１１を埋設すると
ともに、接地網１１から水平距離にして２０〜１００ｍ
ほど離れた位置に、数極の深埋設接地極２５を地表から
２０〜１００ｍ程度又は以上の深さに埋設する。これら
深埋設接地極２５は地中で数極を接続した後、電線２６
により接地網１１と接続する。また、電線２６は、絶縁
することも可能であり、又絶縁管２７で絶縁保護も可能
である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions. In this example, the depth from the ground surface is 0.7 to
The grounding net 11 is buried at a depth of about 1.5 m or more , and the horizontal distance from the grounding net 11 is 20 to 100 m.
Several deeply buried ground electrodes 25 are buried at a distance of about 20 to 100 m or more from the ground surface. These deep buried ground electrodes 25 are connected to several poles in the ground,
Is connected to the ground network 11. Further, the electric wire 26, Ri also der be insulated, also insulating protection possible in the insulating tube 27
Is .
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１７[Correction target item name] 0017
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１７】 図２は同じく第１および第２の発明に係
る第２の実施例の説明図である。この実施例は、地表か
らの深さ０．７〜１．５ｍ程度又は以上の深さに接地網
１１を埋設するとともに、接地網１１から水平距離にし
て１０〜２０００ｍ程度又は以上ほど離れた位置に、数
極の深埋設接地極２５を地表から２０〜１００ｍ程度又
は以上の深さに埋設する。これら深埋設接地極２５と地
表からの深さ０．７〜１．０ｍ程度又は以上の深さまで
の間を絶縁管２７で絶縁保護又は絶縁被覆した電線２８
により接続する。電線２８は上端で絶縁保護された接地
用電線２９に接続してから接地網１１と接続する。な
お、絶縁管２７としては、ＶＰまたはＥＰ等の合成樹脂
管を用いる。FIG. 2 is an explanatory view of the second embodiment according to the first and second inventions. In this embodiment, the grounding net 11 is buried at a depth of about 0.7 to 1.5 m or more from the surface of the earth, and the horizontal distance from the grounding net 11 is about 10 to 2000 m or more. To the number
20~100m about also the poles of the depth buried ground electrode 25 from the surface of the earth
Will be buried at the above depth. Depth from the deep buried earthing electrode 25 and the surface of the earth to a depth of 0.7 to 1.0 m or more
Wire 28 with insulation protection or insulation coating between the spaces with an insulation tube 27
To connect. Wire 28 is grounded with insulation protection at the top
After connecting to the electric wire 29, it is connected to the grounding net 11. As the insulating pipe 27, a synthetic resin pipe such as VP or EP is used.
【手続補正６】[Procedure correction 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１９[Correction target item name] 0019
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１９】 図４は、第３の発明に係る第３の実施例
の説明図である。図において、接地網３１は、設計計画
された間隔で縦横に電線を埋設し、各交差点を接続する
とともに各端部を外周の電線に接続して、電線をメッシ
ュ状に埋設する。このとき、外周部３２と中心部３３に
配設される電線をともに２条以上３条程度として、互い
に０．３〜０．５ｍ程度間隔に掘削溝巾に平行して埋設
する。それにより、外周部３２と中心部３３については
電線の接触表面積が単純比較で他の部分の３倍になり、
集合係数を考慮したその分に見合う抵抗値に減小する。
なお、このように、埋設される接地電線条数を増加して
も、工事の際の掘削溝の溝数は、従来施工の工法と同程
度であるため、工事費はわずかの増加だけですむ。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention. In the figure, the grounding network 31 is a design plan.
The electric wires are embedded vertically and horizontally at the specified intervals, each intersection is connected and each end is connected to the electric wire on the outer periphery, and the electric wires are embedded in a mesh shape. At this time, the electric wires disposed in the outer peripheral portion 32 and the central portion 33 are both two or more and three or more, and are buried in parallel with the excavation groove width at intervals of about 0.3 to 0.5 m. To do. As a result, the contact surface area of the electric wire for the outer peripheral portion 32 and the central portion 33 is three times that of the other portions in a simple comparison,
Decrease small in resistance value commensurate with that amount in consideration of the aggregate coefficient.
In this way, even when increasing the number of Article ground wire to be embedded, the number of grooves of excavation during construction, the extent of the conventional construction of the method
Because it is a degree , the construction cost only needs to increase slightly.
【手続補正７】[Procedure Amendment 7]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２０[Correction target item name] 0020
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２０】 図５は、第４の発明に係る第４の実施例
の説明図である。図において、電気所１２の敷地内に接
地網１１を埋設するとともに、電気所１２から引き出さ
れた電線を支持する鉄塔１８，１９地点地下にそれぞれ
上部を絶縁した深埋設接地極３８，３９等のように数極
を所定深度以上に埋設して接続する。さらに、それぞれ
深埋設接地極３８，３９を絶縁電線３７を介して接地網
１１に接続する。又、鉄塔１８，１９に絶縁電線４１を
使用し場合によっては接続する。この実施例では、故障
電流ｉ2が接地抵抗の小さい深埋設接地極３８，３９に
流れるため、その分、接地網１１に流れる電流が減り、
接地系全体の電圧上昇が抑えられる。すなわち、電気所
１２の接地面積が狭かったり、接地網１１が埋設された
電気所１２下方の地下地質の固有抵抗が大きい場合で
も、故障電流ｉ2の流入による接地網１１の電位上昇が
軽減される。又Ｒm，ＲＴ1，ＲＴ2間を絶縁した電線に
よって接続するため、その間の地表には、地表電圧が発
生せず人畜や低耐電圧機器等に対する安全性が保たれ
る。 FIG. 5 is an explanatory diagram of a fourth embodiment according to the fourth invention. In the figure, the grounding net 11 is buried in the site of the electric substation 12, and the towers 18 and 19 supporting the electric wires drawn out from the electric substation 12 are deep buried grounding electrodes 38 and 39, etc., whose upper parts are insulated underground . In this way, several poles are buried and connected to a predetermined depth or more. Further, the deep-buried ground electrodes 38, 39 are connected to the ground network 11 via the insulated wire 37, respectively. Insulated wires 41 are also installed on the towers 18 and 19.
Use and connect depending on the case. In this embodiment, since the fault current i 2 flows through the deep buried ground electrodes 38, 39 having a small ground resistance, the current flowing through the ground network 11 is reduced accordingly.
Electrodeposition 圧上 temperature entire ground system can be suppressed. That is, even if the grounding area of the electric station 12 is small or the specific resistance of the underground geology below the electric station 12 in which the grounding network 11 is buried is large, the potential rise of the grounding network 11 due to the inflow of the fault current i 2 is reduced. It In addition, for the electric wire which insulated between R m , RT 1 and RT 2
Therefore, since the connection is made, the ground voltage is generated on the ground surface between them.
The safety against human livestock and low withstand voltage equipment is maintained.
It
【手続補正８】[Procedure Amendment 8]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２１[Correction target item name] 0021
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２１】 図６は、第５の発明に係る第５の実施例
の説明図である。この実施例は、図５の実施例と同様
に、電気所１２の敷地内に接地網１１を埋設するととも
に、電気所１２から引き出された電線を支持する鉄塔１
８，１９にそれぞれ上部を絶縁した深埋設接地極３８，
３９等を所定深度以上に埋設して接続する。さらに、鉄
塔１８，１９上に架空電線４０が架設して、それぞれ鉄
塔１８，１９と接続するとともに電気所１２内において
接地網１１に接続する。この実施例は、図５の実施例に
おける絶縁電線３７を架空電線４０に置き換えたもので
あり、同様な効果が得られるとともに、電気所１２、鉄
塔１８，１９の間が地形的に電線を埋設できない場合に
有効である。FIG. 6 is an explanatory diagram of a fifth embodiment according to the fifth invention. In this embodiment, similarly to the embodiment shown in FIG. 5, a ground tower 11 is embedded in the site of the electric power station 12 and a steel tower 1 for supporting electric wires drawn from the electric power station 12 is provided.
8 and 19, deep buried grounding electrodes 38 with their upper parts insulated,
39, etc. are buried and connected to a predetermined depth or more. Further, overhead electric wires 40 are erected on the steel towers 18 and 19 to connect to the steel towers 18 and 19, respectively, and also to the ground network 11 in the electric station 12. In this embodiment, the insulated wire 37 in the embodiment of FIG. 5 is replaced with an overhead wire 40, and the same effect is obtained, and the wire is topographically buried between the electric station 12 and the towers 18 and 19. It is effective when you cannot do it.
【手続補正９】[Procedure Amendment 9]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２２[Name of item to be corrected] 0022
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２２】 図７は第６の発明に係る第６の実施例の
説明図である。図において、１は建造物、１１は接地網
であり、２は接地を必要とする電気設備である。電気設
備２を接地するため、地盤Ｇの表面からＬ１の深さのと
ころに長さＬ２の接地極３を埋設し、接地極部分３と電
気設備２との間を絶縁電線５により接続するとともに、
接地極３から地表までの電線５の周囲をＶＰ、ＥＰ等
（合成樹脂管）４により被覆し電気的に絶縁するか、接
地極部分３と電気設備２の間の地中部分を絶縁電線５で
接続する。FIG. 7 is an explanatory diagram of a sixth embodiment according to the sixth invention. In the figure, 1 is a building , 11 is a grounding network , and 2 is electrical equipment that requires grounding. In order to ground the electric equipment 2, a ground electrode 3 having a length L2 is embedded at a depth L1 from the surface of the ground G, and the ground electrode portion 3 and the electric equipment 2 are connected by an insulated wire 5. ,
The circumference of the electric wire 5 from the ground electrode 3 to the surface of the earth is covered with VP, EP, etc. (synthetic resin pipe) 4 to electrically insulate or connect it.
Insulated wire 5 is used for the underground part between the earth pole part 3 and the electric equipment 2.
Connect .
【手続補正１０】[Procedure Amendment 10]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２３[Name of item to be corrected] 0023
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２３】 この図では建造物等１や接地網１１、他
の接地極２５の地中部からノイズや異常電圧Ｎが発生す
るものとしており、ノイズ発生源である建造物等１，１
１，２５の最下部から接地極３までの距離Ｄは、ノイズ
Ｎの影響が接地極３に及ばない間隔深さとする。通常、
距離Ｄは５ｍ以上であって、しかも接地極３の埋設深さ
Ｌ１は、４〜５００ｍ程度以上である。また、接地極３
の長さもＬ２も５〜５００ｍ程度以上の範囲とする。こ
のように、電線又は導線５と地盤Ｇとの間がＶＰ４によ
り絶縁されたことにより、ノイズＮの発生する建造物等
１の近くに電線５が埋設されても、電線５にノイズや異
常電圧Ｎが侵入または伝播することが防止された、他電
位に影響されない独立した接地電極とすることができ
る。In this figure, a building or the like 1Or grounding net 11, etc.
Grounding electrode 25Noise and abnormal voltage N are generated from the underground part of
Buildings, etc. that are noise sources 1, 1
1,25The distance D from the bottom of the
The influence of N does not reach the ground electrode 3.Spacing depthAnd Normal,
The distance D is 5 m or more, and the buried depth of the ground electrode 3 is
L1 is 4-500mMore than a degreeIs. Also, the ground electrode 3
Both length and L2 are 5-500mMore than a degreeThe range is. This
Electric wire, likeOr conductorBetween VP5 and ground 5 is VP4
Buildings that generate noise N due to insulationetc
Even if the electric wire 5 is buried near 1, the electric wire 5
The normal voltage N is prevented from entering or propagating.Other electricity
Can be an independent ground electrode that is not affected by
It
【手続補正１１】[Procedure Amendment 11]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２４[Name of item to be corrected] 0024
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２４】 それにより、接地極３の埋設位置がノイ
ズＮのために制限されることがなくなり、建造物等１、
接地網１１や他の接地網２５の近くにも埋設した遠方接
地極や、ノイズ防止接地極とすることが可能となって、
地上の配線工事が短距離となり、工事費をその分削減す
ることが可能になる。なお、電線５には、最初から被覆
・絶縁されているＰＶＣ又はＣＥや電線等を用いること
も可能である。その場合は、絶縁管ＶＰ等４の設置が不
要となり、さらに工事が容易になる。As a result, the buried position of the ground electrode 3 is not restricted by the noise N, and the building etc. 1 ,
A remote contact buried near the grounding net 11 or another grounding net 25.
It becomes possible to use it as a ground pole or a noise prevention ground pole ,
Wiring work on the ground will be a short distance, and the construction cost can be reduced accordingly. It is also possible to use PVC or CE, an electric wire or the like which is covered and insulated from the beginning as the electric wire 5. In that case, the installation of the insulating pipe VP or the like 4 is unnecessary, and the construction is further facilitated.
【手続補正１２】[Procedure Amendment 12]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３０[Name of item to be corrected] 0030
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００３０】 第６の発明によれば、深埋設された接地
極と地表部との間を絶縁された電線により接続したた
め、ノイズや異常電圧発生源の影響を受けることがなく
なり、接地極の埋設位置が制限されなくなる。その結
果、この工法を用いれば、接地を必要とする電気施設の
最短距離の位置に接地極を埋設することが可能となり、
用地取得費や工事費を節減することができる。According to the sixth aspect of the invention, since the ground electrode deeply buried and the ground surface are connected by an insulated wire, there is no influence of noise or an abnormal voltage generation source, and the ground electrode is buried. The position is no longer restricted. As a result, using this method, it is possible to bury the grounding electrode at the shortest distance of the electric facility that requires grounding,
Land acquisition costs and construction costs can be saved.
【手続補正１３】[Procedure Amendment 13]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】符号の説明[Correction target item name] Explanation of code
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【符号の説明】 １ 建造物 ２ 電気設備 ３ 接地極 ４ ＶＰ ５ 電線 １１ 接地網 １２ 電気所 １８，１９ 鉄塔 ２５ 深埋設接地極 ２６ 電線 ２７ 絶縁管 ２８ 電線 ２９ 電線 ３１ 接地網 ３２ 外周部 ３３ 中心部 ３７ 絶縁電線 ３８，３９ 深埋設接地極 ４０ 架空電線４１ 接続可能電線 Ｄ ノイズ源から接地極までの距離 Ｇ 地盤 Ｌ１ 接地極の絶縁深さ Ｌ２ 接地極長さ[Explanation of Codes] 1 Building 2 Electrical Equipment 3 Grounding Electrode 4 VP 5 Electric Wire 11 Grounding Network 12 Electricity Station 18, 19 Steel Tower 25 Deep Buried Grounding Electrode 26 Electric Wire 27 Insulating Tube 28 Electric Wire 29 Electric Wire 31 Grounding Ground 32 Outer Part 33 Center Part 37 Insulated wire 38, 39 Deep buried grounding pole 40 Overhead wire 41 Connectable wire D Distance from noise source to grounding pole G Ground L1 Grounding pole insulation depth L2 Grounding pole length
【手続補正１４】[Procedure Amendment 14]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【手続補正１５】[Procedure Amendment 15]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図２[Name of item to be corrected] Figure 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図２】 [Fig. 2]
【手続補正１６】[Procedure Amendment 16]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
【手続補正１７】[Procedure Amendment 17]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図４[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図４】 [Figure 4]
【手続補正１８】[Procedure 18]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図５[Name of item to be corrected] Figure 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図５】 [Figure 5]
【手続補正１９】[Procedure Amendment 19]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図６[Name of item to be corrected] Figure 6
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図６】 [Figure 6]
【手続補正２０】[Procedure amendment 20]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図７[Name of item to be corrected] Figure 7
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図７】 ─────────────────────────────────────────────────────
[Figure 7] ─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年３月２９日[Submission date] March 29, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 深埋設接地極の接地法[Title of Invention] Grounding method for deeply buried ground electrode
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、電気所、建造物等のノ
イズ発生源からノイズの影響を受けることのない深埋設
接地極の接地法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding method for a deeply buried ground electrode which is not affected by noise from noise sources such as electric stations and buildings.
【０００２】[0002]
【従来の技術】従来、大形の電気所、すなわち発変電
所、開閉所、無線中継所等の接地には、接地電位傾度の
均一化をはかる目的で図８のようなメッシュ状に埋設し
た接地網１１が一般的に採用されている。この接地網１
１は、地絡事故時における電気所所１２内の接地上昇電
位を１０００Ｖ以内程度にするため、抵抗値が０．０３
オーム以下となるよう要求されることがある。なお、図
中の１３は鉄塔、１４は引留め架構、１５は機器架構と
の接続線である。そこで、このような不利な条件のもと
での工事施工を有利にする目的で、図９のような実験を
行い電流値を実測した。図中の１１は地表から０．７〜
１．５ｍの深さに埋設された接地網、１３は鉄塔、１４
は引留め架構、１５は機器架構との接続線、１６はトラ
ンス、１７は遮断器、１８〜２０は鉄塔、２１は送電
線、２２は送電線２１と鉄塔１８〜２０を絶縁する碍
子、２３は架空地線である。この実験では、電気所から
１８Ｋｍの鉄塔２０において、送電線２１よりジャンパ
ー接続線２４を介して電流Ｉを鉄塔２０へ通電した結
果、架空地線２３に分流する電流ｉ2はＩの３４％、地
中を流れて接地網１１に流入する電流ｉ1は６０％、No.
１の鉄塔１８より接地網２に流入する電流ｉ3は約６％
程度であることが判明した。2. Description of the Related Art Conventionally, in the grounding of a large electric power station, that is, a power substation, a switching station, a wireless relay station, etc., it is embedded in a mesh shape as shown in FIG. 8 for the purpose of equalizing the ground potential gradient. The grounding grid 11 is generally adopted. This ground net 1
No. 1 has a resistance value of 0.03 so that the ground rising potential in the electric power station 12 at the time of the ground fault is within about 1000V.
May be required to be below ohms. In the figure, 13 is a steel tower, 14 is a retaining frame, and 15 is a connecting line to the equipment frame. Therefore, for the purpose of making the construction work advantageous under such a disadvantageous condition, an experiment as shown in FIG. 9 was conducted to measure the current value. 11 in the figure is 0.7 to 0.7 from the ground surface.
Grounding net buried at a depth of 1.5 m, 13 is a tower, 14
Is a retaining frame, 15 is a connecting line to the equipment frame, 16 is a transformer, 17 is a circuit breaker, 18 to 20 are steel towers, 21 is a power transmission line, 22 is an insulator for insulating the power transmission line 21 and the steel towers 18 to 20, 23 Is an aerial ground line. In this experiment, as a result of passing a current I from the power transmission line 21 to the steel tower 20 through the jumper connection line 24 in the steel tower 20 18 km from the electric station, the current i 2 shunted to the overhead ground wire 23 is 34% of I, The current i 1 flowing in the ground and flowing into the grounding net 11 is 60%, No.
The current i 3 flowing from the steel tower 18 of No. 1 into the ground network 2 is about 6%.
Turned out to be about.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年の
送電容量の増大に伴い、山間地に電気所が求められる例
が多く、しかも、近年の用地取得難によって、電気所の
スペースも制約を受ける場合が多くなってきた。そのた
め、接地工事現場における地下地質の固有抵抗が大きか
ったり、接地場所が狭いという不利な条件のもとで施工
することが多くなってきた。また、深埋設接地極を埋設
した場合、接地極の埋設位置の近くにノイズを発生する
電気施設や建造物があると、地表近くの裸電線にノイズ
が侵入してしまう。そのため、ノイズの影響を避けよう
とすると、ノイズを発生する電気施設や建造物と充分な
距離を隔てた位置に接地極を埋設しなければならず、埋
設位置が制限されるという問題があった。本発明は上記
問題点を解決するためになされたもので、その目的とす
るところは、地下地質の固有抵抗が大きかったり、接地
場所が狭いという不利な条件のもとでも充分な接地を可
能にするとともに、接地極の埋設位置に制限を受けるこ
とのない深埋設接地極の接地法を提供することにある。However, with the recent increase in power transmission capacity, there are many cases where an electric power station is required in a mountainous area, and moreover, the space of the electric power station is also restricted due to the difficulty of land acquisition in recent years. Is increasing. For this reason, it is becoming more common to carry out construction under the disadvantageous conditions that the specific resistance of the underground geology at the grounding construction site is large and the grounding site is small. Further, when a deeply buried grounding electrode is buried, if there is an electric facility or a building that generates noise near the buried position of the grounding electrode, noise will intrude into the bare wire near the surface of the earth. Therefore, in order to avoid the influence of noise, there is a problem that the grounding electrode must be buried at a position that is separated from the electric facility or structure that generates noise by a sufficient distance, and the buried position is limited. . The present invention has been made to solve the above problems, and its object is to enable sufficient grounding even under the disadvantageous conditions that the specific resistance of underground geology is large or the grounding place is narrow. In addition, there is a need to provide a grounding method for a deep buried grounding electrode that is not restricted by the buried position of the grounding electrode.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、第１の発明は、地表近くにメッシュ状の接地網を埋
設するとともに、この接地網と充分な距離を隔てた位置
に、地表部を絶縁して地中部に単独または複数の深埋設
接地極を埋設し、接地網と深埋設接地極とを電線により
接続したことを特徴とする。In order to achieve the above object, a first aspect of the present invention is to embed a mesh-shaped grounding net near the ground surface and to keep the ground surface at a position separated from the grounding net by a sufficient distance. It is characterized in that the portion is insulated and a single or a plurality of deeply buried grounding electrodes are buried in the ground, and the grounding net and the deeply buried grounding electrode are connected by electric wires.
【０００５】第２の発明は、第１発明において、深埋設
接地極の接地抵抗を接地網の見掛け接地抵抗値以下とし
たことを特徴とする。A second invention is characterized in that, in the first invention, the ground resistance of the deeply buried ground electrode is set to be equal to or less than the apparent ground resistance value of the ground network.
【０００６】第３の発明は、第１または第２の発明にお
いて、接地網の外周部および中央部に複数の電線を近接
させて埋設したことを特徴とする。A third invention is characterized in that, in the first or second invention, a plurality of electric wires are embedded in the outer peripheral portion and the central portion of the grounding network in close proximity to each other.
【０００７】第４の発明は、第１または第２または第３
の発明において、接地網を電気所に埋設するとともに、
深埋設接地極を電気所よりの１以上の引出し・引込み鉄
塔ごとに埋設して鉄塔と接続したことを特徴とする。A fourth invention is the first or second or third invention.
In the invention of, the grounding network is buried in the electric station,
It is characterized in that a deeply buried ground electrode is buried in each of at least one drawer / pull-in tower from an electric power station and connected to the tower.
【０００８】第５の発明は、第４の発明において、接地
網と深埋設接地極との間を架空線により接続したことを
特徴とする。A fifth invention is characterized in that, in the fourth invention, the grounding network and the deeply buried grounding electrode are connected by an overhead wire.
【０００９】第６の発明は、地表部のノイズ発生源の影
響を受けることのない充分な深さに接地極を埋設し、接
地極から地表までの間を絶縁された電線又は絶縁線管等
により絶縁し裸電線等により接続したことを特徴とす
る。A sixth aspect of the present invention is an electric wire or insulated wire tube in which the grounding electrode is buried in a sufficient depth so as not to be affected by a noise generating source on the surface of the ground, and insulated from the grounding electrode to the surface of the ground. It is characterized by being insulated by and connected by a bare wire or the like.
【００１０】[0010]
【作用】第１の発明においては、地表近くに埋設された
メッシュ状の接地網と、地表部を絶縁して地中深くに単
独または複数埋設された深埋設接地極との間隔が大きく
なるように、接地網と深埋設接地極とが電線により接続
される。それにより、故障電流は深埋設接地極側に多く
流れて、その分、接地網の電位上昇が小さくなる。In the first aspect of the present invention, the distance between the mesh-shaped grounding net buried near the surface of the earth and the deeply buried grounding electrode that is buried deeply in the ground by insulating the ground surface is large. The grounding net and the deeply buried grounding electrode are connected by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the potential of the ground network is reduced accordingly.
【００１１】第２の発明においては、深埋設接地極の接
地抵抗が接地網の見掛け接地抵抗値以下とされることに
より、接地網に流れる故障電流が減り、接地網の電位上
昇が抑えられる。In the second aspect of the present invention, the ground resistance of the deep buried ground electrode is set to be equal to or lower than the apparent ground resistance value of the ground network, so that the fault current flowing in the ground network is reduced and the potential rise of the ground network is suppressed.
【００１２】第３の発明においては、接地網の外周部お
よび中央部に複数の電線が近接して埋設されることによ
り、単位面積当たりの埋設電線長が増して接地網の見掛
け接地抵抗値が小さくなる。In the third invention, a plurality of electric wires are buried close to the outer peripheral portion and the central portion of the grounding net, so that the length of the buried electric wire per unit area is increased and the apparent grounding resistance value of the grounding net is increased. Get smaller.
【００１３】第４の発明においては、接地網が電気所に
埋設されるとともに、深埋設接地極が電気所よりの１以
上の引出し・引込み鉄塔ごとに埋設されて鉄塔と接続さ
れる。それにより、引出し・引込み鉄塔で地絡が発生し
た場合に電流は深埋設接地極に流れ、その分接地網に流
れる電流が減り、接地網の電位の上昇が抑えられる。In the fourth aspect of the present invention, the grounding network is buried in the electric station, and the deeply buried grounding electrode is buried in each of the one or more extraction / pulling-in steel towers from the electric station and connected to the steel tower. As a result, when a ground fault occurs in the drawer / pull-in tower, the current flows to the deep buried ground electrode, the current flowing to the ground network is reduced accordingly, and the rise in the potential of the ground network is suppressed.
【００１４】第５の発明においては、第４の発明におけ
る接地網と深埋設接地極との間が架空線により接続され
たことにより、接地網と深埋設接地極との間の抵抗値が
小さくなり接地網の電位上昇がわずかになる。In the fifth invention, the ground wire and the deep-buried ground electrode in the fourth invention are connected by an overhead wire, so that the resistance value between the ground net and the deep-buried ground electrode is small. Therefore, the potential rise of the grounding net becomes slight.
【００１５】第６の発明においては、接地極が充分な深
さに埋設されたことにより、接地極は地表部のノイズ発
生源の影響を受けることがなくなる。また、接地極と地
表部との間を接続する電線も絶縁されているため同様に
ノイズ発生源の影響を受けることがなくなる。それによ
り、接地極の埋設位置は制限されることがなくなり、任
意の位置に深埋設接地極を埋設することが可能になる。In the sixth aspect of the invention, since the grounding electrode is buried in a sufficient depth, the grounding electrode is not affected by the noise generating source on the ground surface. Further, since the electric wire connecting the ground electrode and the ground surface portion is also insulated, it is likewise not affected by the noise generation source. As a result, the buried position of the ground electrode is not restricted, and the deep buried ground electrode can be buried at any position.
【００１６】[0016]
【実施例】以下、図によって本発明の実施例を説明す
る。図１は第１および第２の発明に係る第１の実施例の
説明図である。この実施例は、地表からの深さ０．７〜
１．５ｍの深さに接地網１１を埋設するとともに、接地
網１１から水平距離にして２０〜１００ｍほど離れた位
置に、３本の深埋設接地極２５を地表から２０〜１００
ｍの深さに埋設する。これら深埋設接地極２５は地中で
３本を接続した後、電線２６により接地網１１と接続す
る。また、電線２６は、絶縁することも可能である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions. In this example, the depth from the ground surface is 0.7 to
The grounding net 11 is buried at a depth of 1.5 m, and three deeply buried grounding electrodes 25 are located 20 to 100 m apart from the ground surface at a horizontal distance of 20 to 100 m from the grounding net 11.
Buried to a depth of m. These three deeply buried ground electrodes 25 are connected to the ground network 11 by electric wires 26 after connecting three in the ground. The electric wire 26 can also be insulated.
【００１７】図２は同じく第１および第２の発明に係る
第２の実施例の説明図である。この実施例は、地表から
の深さ０．７〜１．５ｍの深さに接地網１１を埋設する
とともに、接地網１１から水平距離にして１０〜２００
０ｍほど離れた位置に、３本の深埋設接地極２５を地表
から２０〜１００ｍの深さに埋設する。これら深埋設接
地極２５と地表からの深さ０．７〜１．０ｍの深さまで
間を絶縁管２７で被覆した電線２８により接続する。電
線２８は上端で電線２９に接続してから接地網１１と接
続する。なお、絶縁管２７としては、ＶＰまたはＥＰ等
の合成樹脂管を用いる。FIG. 2 is an explanatory view of a second embodiment according to the first and second inventions. In this embodiment, the grounding net 11 is buried at a depth of 0.7 to 1.5 m from the ground surface, and the horizontal distance from the grounding net 11 is 10 to 200.
Three deep buried ground electrodes 25 are buried at a depth of 20 to 100 m from the surface of the earth at a position separated by about 0 m. The deeply buried ground electrode 25 and the ground surface are connected to each other by a wire 28 covered with an insulating tube 27 to a depth of 0.7 to 1.0 m. The electric wire 28 is connected to the electric wire 29 at the upper end and then connected to the ground net 11. As the insulating pipe 27, a synthetic resin pipe such as VP or EP is used.
【００１８】図３は、図１および図２の実施例の等価回
路図である。接地抵抗ＲはＶ／Ｉとして求められるが、
故障電流Ｉが通電される場所からみた接地網１１の接地
抵抗を見掛け抵抗Ｒｍとし、深埋設接地極２５の抵抗を
ＲDとして、抵抗ＲDを抵抗Ｒｍよりも小さく設定する
と、故障電流ｉ2は接地抵抗の小さい深埋設接地極２５
へ流れる。すなわち、接地網１１の端部ＲEの電圧Ｖ
Eは、接地網１１の電圧Ｖmより小さくなり、さらに深埋
設接地極２５の接地効果により接地網１１の電位上昇が
軽減される。FIG. 3 is an equivalent circuit diagram of the embodiment shown in FIGS. 1 and 2. The ground resistance R is calculated as V / I,
If the ground resistance of the grounding net 11 as seen from the place where the fault current I is conducted is set as the apparent resistance Rm, the resistance of the deep buried ground electrode 25 is set as R D , and the resistance R D is set smaller than the resistance Rm, the fault current i 2 Is a deep buried ground electrode 25 with a small ground resistance.
Flows to. That is, the voltage V at the end R E of the ground network 11
E becomes smaller than the voltage V m of the ground net 11, and the potential increase of the ground net 11 is reduced by the grounding effect of the deeply buried ground electrode 25.
【００１９】図４は、第３の発明に係る第３の実施例の
説明図である。図において、接地網３１は、約２０ｍ間
隔で縦横に電線を埋設し、各交差点を接続するとともに
各端部を外周の電線に接続して、電線をメッシュ状に埋
設する。このとき、外周部３２と中心部３３に配設され
る電線をともに３本として、互いに近接して埋設する。
それにより、外周部３２と中心部３３については電線の
接触表面積が単純比較で他の部分の３倍になり、その分
抵抗値が少なくなる。なお、このように、埋設される電
線数を増しても、工事の際の掘削溝の本数は、従来と同
じであるため、工事費はわずかの増加だけですむ。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention. In the figure, the grounding net 31 embeds electric wires vertically and horizontally at intervals of about 20 m, connects each intersection, and connects each end to an electric wire on the outer circumference to embed the electric wires in a mesh shape. At this time, three electric wires are provided in the outer peripheral portion 32 and the central portion 33, and are embedded close to each other.
As a result, the contact surface area of the electric wire in the outer peripheral portion 32 and the central portion 33 is three times that in the other portions in a simple comparison, and the resistance value is reduced accordingly. Even if the number of buried wires is increased in this way, the number of excavation grooves during construction is the same as the conventional one, and therefore the construction cost is only slightly increased.
【００２０】図５は、第４の発明に係る第４の実施例の
説明図である。図において、電気所１２の敷地内に接地
網１１を埋設するとともに、電気所１２から引き出され
た電線を支持する鉄塔１８，１９にそれぞれ上部を絶縁
した深埋設接地極３８，３９を所定深度以上に埋設して
接続する。さらに、それぞれ深埋設接地極３８，３９を
絶縁電線３７を介して接地網１１に接続する。この実施
例では、故障電流ｉ2が接地抵抗の小さい深埋設接地極
３８，３９に流れるため、その分、接地網１１に流れる
電流が減り、電圧の上昇が抑えられる。すなわち、電気
所１２の接地面積が狭かったり、接地網１１が埋設され
た電気所１２下方の地下地質の固有抵抗が大きい場合で
も、故障電流ｉ2の流入による接地網１１の電位上昇が
軽減される。FIG. 5 is an explanatory view of the fourth embodiment according to the fourth invention. In the figure, the grounding net 11 is buried in the site of the electric substation 12, and the deeply buried grounding electrodes 38, 39 having upper portions insulated from the steel towers 18, 19 supporting the electric wires drawn out from the electric substation 12 have a predetermined depth or more. Buried in and connected. Further, the deep-buried ground electrodes 38, 39 are connected to the ground network 11 via the insulated wire 37, respectively. In this embodiment, the fault current i 2 flows through the deep buried ground electrodes 38, 39 having a small ground resistance, so that the current flowing through the ground network 11 is correspondingly reduced and the rise in voltage is suppressed. That is, even if the grounding area of the electric station 12 is small or the specific resistance of the underground geology below the electric station 12 in which the grounding network 11 is buried is large, the potential rise of the grounding network 11 due to the inflow of the fault current i 2 is reduced. It
【００２１】図６は、第５の発明に係る第５の実施例の
説明図である。この実施例は、図５の実施例と同様に、
電気所１２の敷地内に接地網１１を埋設するとともに、
電気所１２から引き出された電線を支持する鉄塔１８，
１９にそれぞれ上部を絶縁した深埋設接地極３８，３９
を所定深度以上に埋設して接続する。さらに、鉄塔１
８，１９上に架空電線４０が架設して、それぞれ鉄塔１
８，１９と接続するとともに電気所１２内において接地
網１１に接続する。この実施例は、図５の実施例におけ
る絶縁電線３７を架空電線４０に置き換えたものであ
り、同様な効果が得られるとともに、電気所１２、鉄塔
１８，１９の間が地形的に電線を埋設できない場合に有
効である。FIG. 6 is an explanatory view of a fifth embodiment according to the fifth invention. This embodiment is similar to the embodiment of FIG.
In addition to burying the grounding net 11 in the site of the electric station 12,
A steel tower 18 supporting electric wires drawn from the electric power station 12,
The deep buried grounding electrodes 38 and 39 with their upper parts insulated from each other
Is buried to a predetermined depth or more and connected. Furthermore, the steel tower 1
The overhead electric wires 40 are erected on 8 and 19, and the steel tower 1
8 and 19, and also to the grounding network 11 in the electric station 12. In this embodiment, the insulated wire 37 in the embodiment of FIG. 5 is replaced with an overhead wire 40, and the same effect is obtained, and the wire is topographically buried between the electric station 12 and the towers 18 and 19. It is effective when you cannot do it.
【００２２】図７は第６の発明に係る第６の実施例の説
明図である。図において、１は建造物であり、２は接地
を必要とする電気設備である。電気設備２を接地するた
め、地盤Ｇの表面からＬ１の深さのところに長さＬ２の
接地極３を埋設し、接地極３と電気設備２との間を電線
５により接続するとともに、接地極３から地表までの電
線５の周囲をＶＰ、ＥＰ等（合成樹脂管）４により被覆
し電気的に絶縁する。FIG. 7 is an explanatory diagram of a sixth embodiment according to the sixth invention. In the figure, 1 is a building, and 2 is an electrical installation that requires grounding. In order to ground the electric equipment 2, a grounding electrode 3 having a length L2 is embedded at a depth L1 from the surface of the ground G, and the grounding electrode 3 and the electric equipment 2 are connected by an electric wire 5 and grounded. The periphery of the electric wire 5 from the pole 3 to the surface of the earth is covered with VP, EP or the like (synthetic resin pipe) 4 and electrically insulated.
【００２３】この図では建造物等１の地中部からノイズ
や異常電圧Ｎが発生するものとしており、ノイズ発生源
である建造物等１の最下部から接地極３までの距離Ｄ
は、ノイズＮの影響が接地極３に及ばない距離とする。
通常、距離Ｄは５ｍ以上であって、しかも接地極３の埋
設深さＬ１は、４〜５００ｍである。また、接地極３の
長さもＬ２も５〜５００ｍの範囲とする。このように、
電線５と地盤Ｇとの間がＶＰ４により絶縁されたことに
より、ノイズＮの発生する建造物１の近くに電線５が埋
設されても、電線５にノイズや異常電圧Ｎが侵入または
伝播することが防止される。In this figure, noise and an abnormal voltage N are generated from the underground portion of the building 1 and the distance D from the bottom of the building 1 which is the noise source to the ground electrode 3
Is a distance such that the influence of the noise N does not reach the ground electrode 3.
Usually, the distance D is 5 m or more, and the buried depth L1 of the ground electrode 3 is 4 to 500 m. Further, both the length of the ground electrode 3 and L2 are in the range of 5 to 500 m. in this way,
Since the electric wire 5 is insulated from the ground G by the VP 4, even if the electric wire 5 is buried near the building 1 where the noise N is generated, noise or an abnormal voltage N may penetrate or propagate into the electric wire 5. Is prevented.
【００２４】それにより、接地極３の埋設位置がノイズ
Ｎのために制限されることがなくなり、建造物１の近く
にも埋設することが可能となって地上の配線工事が短距
離となり、工事費をその分削減することが可能になる。
なお、電線５には、最初から被覆・絶縁されているＰＶ
Ｃ又はＣＥや電線等を用いることも可能である。その場
合は、絶縁管ＶＰ等４の設置が不要となり、さらに工事
が容易になる。As a result, the buried position of the ground electrode 3 is not restricted by the noise N, and the ground electrode 3 can be buried near the building 1, which shortens the wiring work on the ground. The cost can be reduced accordingly.
The electric wire 5 is PV that is covered and insulated from the beginning.
It is also possible to use C or CE, an electric wire, or the like. In that case, the installation of the insulating pipe VP or the like 4 is unnecessary, and the construction is further facilitated.
【００２５】[0025]
【発明の効果】以上述べたように第１の発明によれば、
地表近くにメッシュ状に接地網を埋設するとともに、こ
の接地網と充分な距離を隔てた位置に、地表部を絶縁し
て地中部に単独または複数の深埋設接地極を埋設し、接
地網と深埋設接地極とを電線により接続する。それによ
り、故障電流は深埋設接地極側に多く流れて、その分接
地網の電圧上昇が小さくなる。As described above, according to the first invention,
A grounding mesh is buried near the surface of the ground, and the ground surface is insulated at a sufficient distance from this grounding net to bury one or more deeply buried grounding electrodes in the ground. Connect to the deep buried ground electrode by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the voltage of the ground network is reduced accordingly.
【００２６】第２の発明によれば、第１発明における深
埋設接地極の接地抵抗を接地網の見掛け接地抵抗値以下
としたことにより、故障電流が深埋設接地極側に確実に
多く流れて、その分、接地網の電圧上昇がより小さくな
る。According to the second invention, since the ground resistance of the deep buried ground electrode in the first invention is set to be equal to or smaller than the apparent ground resistance value of the ground network, a large amount of fault current flows to the deep buried ground electrode side without fail. Therefore, the voltage rise of the ground network becomes smaller accordingly.
【００２７】第３の発明によれば、第１または第２の発
明における接地網の外周部および中央部に複数の電線を
近接させて埋設したことにより、単位面積当たりの埋設
電線長が増して接地網の見掛け接地抵抗値が小さくな
る。According to the third invention, by embedding a plurality of electric wires close to each other in the outer peripheral portion and the central portion of the grounding net in the first or second invention, the embedded electric wire length per unit area is increased. The apparent ground resistance value of the ground network is reduced.
【００２８】第４の発明によれば、第１または第２また
は第３の発明において、接地網を電気所に埋設し、深埋
設接地極を電気所よりの１以上の引出し・引込み鉄塔ご
とに埋設して鉄塔と接続したことにより、故障電流は深
埋設接地極に流れ、その分接地網に流れる電流が減り、
接地網の電位の上昇が抑えられる。すなわち、接地面積
が狭かったり、地下地質の固有抵抗が大きいようなとこ
ろであっても接地網の接地能力が補完されることにより
電気所の設置が可能になる。According to a fourth aspect of the present invention, in the first, second or third aspect, the grounding net is buried in the electric station, and the deep buried grounding electrode is provided for each of the one or more extraction / pull-in towers from the electric station. By burying it and connecting it to the steel tower, the fault current flows to the deep buried grounding electrode, and the current flowing to the grounding network is reduced accordingly.
The rise of the potential of the grounding net is suppressed. That is, even in a place where the grounding area is small or the underground geology has a large specific resistance, the grounding capacity of the grounding network is supplemented, so that an electric station can be installed.
【００２９】第５の発明によれば、第４の発明におい
て、接地網と深埋設接地極との間を架空線により接続し
たことにより、その分、接地網と深埋設接地極との間の
抵抗値が小さくなり電位上昇がわずかになる。According to the fifth invention, in the fourth invention, the ground network and the deep-buried ground electrode are connected by an overhead wire, so that the ground network and the deep-buried ground electrode are connected by that amount. The resistance becomes smaller and the potential rises slightly.
【００３０】第６の発明によれば、深埋設された接地極
と地表部との間を絶縁された電線により接続したため、
ノイズや異常電圧発生源の影響を受けることがなくな
り、接地極の埋設位置が制限されなくなる。その結果、
この工法を用いれば、接地を必要とする電気施設の最短
距離の位置に接地極を埋設することが可能となり、工事
費を節減することができる。According to the sixth aspect of the invention, since the deeply buried grounding electrode and the ground surface are connected by an insulated wire,
It is not affected by noise or an abnormal voltage generation source, and the buried position of the ground electrode is no longer restricted. as a result,
By using this construction method, it becomes possible to bury the grounding electrode at the position of the shortest distance of the electric facility that requires grounding, and it is possible to reduce the construction cost.
【図面の簡単な説明】[Brief description of drawings]
【図１】第１および第２の発明に係る第１の実施例の説
明図である。FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions.
【図２】第１および第２の発明に係る第２の実施例の説
明図である。FIG. 2 is an explanatory diagram of a second embodiment according to the first and second inventions.
【図３】図１および図２の実施例の動作を説明する等価
回路図である。FIG. 3 is an equivalent circuit diagram illustrating the operation of the embodiment of FIGS. 1 and 2.
【図４】第３の発明に係る第３の実施例の説明図であ
る。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention.
【図５】第４の発明に係る第４の実施例の説明図であ
る。FIG. 5 is an explanatory diagram of a fourth embodiment according to the fourth invention.
【図６】第５の発明に係る第５の実施例の説明図であ
る。FIG. 6 is an explanatory diagram of a fifth embodiment according to the fifth invention.
【図７】第６の発明に係る第６の実施例の説明図であ
る。FIG. 7 is an explanatory diagram of a sixth embodiment according to the sixth invention.
【図８】従来の電気所における接地の説明図である。FIG. 8 is an explanatory diagram of grounding in a conventional electric station.
【図９】従来の電気所および送電路における接地電流測
定実験を示す説明図である。FIG. 9 is an explanatory diagram showing a ground current measurement experiment in a conventional electric station and power transmission path.
【符号の説明】 １ 建造物 ２ 電気設備 ３ 接地極 ４ ＶＰ ５ 電線 １１ 接地網 １２ 電気所 １８，１９ 鉄塔 ２５ 深埋設接地極 ２６ 電線 ２７ 絶縁管 ２８ 電線 ２９ 電線 ３１ 接地網 ３２ 外周部 ３３ 中心部 ３７ 絶縁電線 ３８，３９ 深埋設接地極 ４０ 架空電線 Ｄ ノイズ源から接地極までの距離 Ｇ 地盤 Ｌ１ 接地極深さ Ｌ２ 接地極長さ[Explanation of Codes] 1 Building 2 Electrical Equipment 3 Grounding Electrode 4 VP 5 Electric Wire 11 Grounding Net 12 Electricity Station 18, 19 Steel Tower 25 Deep Buried Grounding Electrode 26 Electric Wire 27 Insulating Pipe 28 Electric Wire 29 Electric Wire 31 Grounding Net 32 Outer Part 33 Center Part 37 Insulated wire 38, 39 Deeply buried ground electrode 40 Overhead wire D Distance from noise source to ground electrode G Ground L1 Ground electrode depth L2 Ground electrode length
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【図２】 [Fig. 2]
【図３】 [Figure 3]
【図４】 [Figure 4]
【図５】 [Figure 5]
【図６】 [Figure 6]
【図７】 [Figure 7]
【図８】 [Figure 8]
【図９】 ─────────────────────────────────────────────────────
[Figure 9] ─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年４月１２日[Submission date] April 12, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 深埋設接地極の接地法[Title of Invention] Grounding method for deeply buried ground electrode
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、電気所、建造物等に接
続される深埋設接地極の接地法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding method for a deep buried ground electrode connected to an electric station, a building or the like.
【０００２】[0002]
【従来の技術】従来、大形の電気所、すなわち発変電
所、開閉所、無線中継所等の接地には、接地電位傾度の
均一化をはかる目的で図７のようなメッシュ状に埋設し
た接地網１１が一般的に採用されている。この接地網１
１は、地絡事故時における電気所所１２内の接地上昇電
位を１０００Ｖ以内程度にするため、抵抗値が０．０３
オーム以下となるよう要求されることがある。なお、図
中の１３は鉄塔、１４は引留め架構、１５は機器架構と
の接続線である。そこで、このような不利な条件のもと
での工事施工を有利にする目的で、図８のような実験を
行い電流値を実測した。図中の１１は地表から０．７〜
１．５ｍの深さに埋設された接地網、１３は鉄塔、１４
は引留め架構、１５は機器架構との接続線、１６はトラ
ンス、１７は遮断器、１８〜２０は鉄塔、２１は送電
線、２２は送電線２１と鉄塔１８〜２０を絶縁する碍
子、２３は架空地線である。この実験では、電気所から
１８Ｋｍの鉄塔２０において、送電線２１よりジャンパ
ー接続線２４を介して電流Ｉを鉄塔２０へ通電した結
果、架空地線２３に分流する電流ｉ2はＩの３４％、地
中を流れて接地網１１に流入する電流ｉ1は６０％、No.
１の鉄塔１８より接地網２に流入する電流ｉ3は約６％
程度であることが判明した。2. Description of the Related Art Conventionally, in the grounding of large electric power stations, that is, power substations, switch stations, wireless relay stations, etc., they are buried in a mesh shape as shown in FIG. 7 for the purpose of equalizing the ground potential gradient. The grounding grid 11 is generally adopted. This ground net 1
No. 1 has a resistance value of 0.03 so that the ground rising potential in the electric power station 12 at the time of the ground fault is within about 1000V.
May be required to be below ohms. In the figure, 13 is a steel tower, 14 is a retaining frame, and 15 is a connecting line to the equipment frame. Therefore, for the purpose of making the construction work advantageous under such a disadvantageous condition, an experiment as shown in FIG. 8 was conducted and the current value was measured. 11 in the figure is 0.7 to 0.7 from the ground surface.
Grounding net buried at a depth of 1.5 m, 13 is a tower, 14
Is a retaining frame, 15 is a connecting line to the equipment frame, 16 is a transformer, 17 is a circuit breaker, 18 to 20 are steel towers, 21 is a power transmission line, 22 is an insulator for insulating the power transmission line 21 and the steel towers 18 to 20, 23 Is an aerial ground line. In this experiment, as a result of passing a current I from the power transmission line 21 to the steel tower 20 through the jumper connection line 24 in the steel tower 20 18 km from the electric power station, the current i 2 shunted to the overhead ground wire 23 is 34% of I, The current i 1 flowing in the ground and flowing into the grounding net 11 is 60%, No.
The current i 3 flowing from the steel tower 18 of No. 1 into the ground network 2 is about 6%.
Turned out to be about.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年の
送電容量の増大に伴い、山間地に電気所が求められる例
が多く、しかも、近年の用地取得難によって、電気所の
スペースも制約を受ける場合が多くなってきた。そのた
め、接地工事現場における地下地質の固有抵抗が大きか
ったり、接地場所が狭いという不利な条件のもとで施工
しなければならないという問題があった。本発明は上記
問題点を解決するためになされたもので、その目的とす
るところは、地下地質の固有抵抗が大きかったり、接地
場所が狭いという不利な条件のもとでも充分な接地を可
能にする深埋設接地極の接地法を提供することにある。However, with the recent increase in power transmission capacity, there are many cases where an electric power station is required in a mountainous area, and moreover, the space of the electric power station is also restricted due to the difficulty of land acquisition in recent years. Is increasing. Therefore, there is a problem that the construction must be performed under the disadvantageous conditions that the ground resistance has a large resistivity and the grounding site is small. The present invention has been made to solve the above problems, and its object is to enable sufficient grounding even under the disadvantageous conditions that the specific resistance of underground geology is large or the grounding place is narrow. It is to provide a grounding method for a deep buried grounding electrode.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、第１の発明は、地表近くにメッシュ状の接地網を埋
設するとともに、この接地網と充分な距離を隔てた位置
に、地表部を絶縁して地中部に単独または複数の深埋設
接地極を埋設し、接地網と深埋設接地極とを電線により
接続したことを特徴とする。In order to achieve the above object, a first aspect of the present invention is to embed a mesh-shaped grounding net near the ground surface and to keep the ground surface at a position separated from the grounding net by a sufficient distance. It is characterized in that the portion is insulated and a single or a plurality of deeply buried grounding electrodes are buried in the ground, and the grounding net and the deeply buried grounding electrode are connected by electric wires.
【０００５】第２の発明は、第１発明において、深埋設
接地極の接地抵抗を接地網の見掛け接地抵抗値以下とし
たことを特徴とする。A second invention is characterized in that, in the first invention, the ground resistance of the deeply buried ground electrode is set to be equal to or less than the apparent ground resistance value of the ground network.
【０００６】第３の発明は、第１または第２の発明にお
いて、接地網の外周部および中央部に複数の電線を近接
させて埋設したことを特徴とする。A third invention is characterized in that, in the first or second invention, a plurality of electric wires are embedded in the outer peripheral portion and the central portion of the grounding network in close proximity to each other.
【０００７】第４の発明は、第１または第２または第３
の発明において、接地網を電気所に埋設するとともに、
深埋設接地極を電気所よりの１以上の引出し・引込み鉄
塔ごとに埋設して鉄塔と接続したことを特徴とする。A fourth invention is the first or second or third invention.
In the invention of, the grounding network is buried in the electric station,
It is characterized in that a deeply buried ground electrode is buried in each of at least one drawer / pull-in tower from an electric power station and connected to the tower.
【０００８】第５の発明は、第４の発明において、接地
網と深埋設接地極との間を架空線により接続したことを
特徴とする。A fifth invention is characterized in that, in the fourth invention, the grounding network and the deeply buried grounding electrode are connected by an overhead wire.
【０００９】[0009]
【作用】第１の発明においては、地表近くに埋設された
メッシュ状の接地網と、地表部を絶縁して地中深くに単
独または複数埋設された深埋設接地極との間隔が大きく
なるように、接地網と深埋設接地極とが電線により接続
される。それにより、故障電流は深埋設接地極側に多く
流れて、その分、接地網の電位上昇が小さくなる。In the first aspect of the present invention, the distance between the mesh-shaped grounding net buried near the surface of the earth and the deeply buried grounding electrode that is buried deeply in the ground by insulating the ground surface is large. The grounding net and the deeply buried grounding electrode are connected by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the potential of the ground network is reduced accordingly.
【００１０】第２の発明においては、深埋設接地極の接
地抵抗が接地網の見掛け接地抵抗値以下とされることに
より、接地網に流れる故障電流が減り、接地網の電位上
昇が抑えられる。In the second aspect of the present invention, the ground resistance of the deep buried ground electrode is set to be equal to or lower than the apparent ground resistance value of the ground network, so that the fault current flowing in the ground network is reduced and the potential rise of the ground network is suppressed.
【００１１】第３の発明においては、接地網の外周部お
よび中央部に複数の電線が近接して埋設されることによ
り、単位面積当たりの埋設電線長が増して接地網の見掛
け接地抵抗値が小さくなる。In the third invention, a plurality of electric wires are buried close to the outer peripheral portion and the central portion of the grounding net, so that the length of the buried electric wire per unit area is increased and the apparent grounding resistance value of the grounding net is increased. Get smaller.
【００１２】第４の発明においては、接地網が電気所に
埋設されるとともに、深埋設接地極が電気所よりの１以
上の引出し・引込み鉄塔ごとに埋設されて鉄塔と接続さ
れる。それにより、引出し・引込み鉄塔で地絡が発生し
た場合に電流は深埋設接地極に流れ、その分接地網に流
れる電流が減り、接地網の電位の上昇が抑えられる。In the fourth aspect of the present invention, the grounding network is buried in the electric station, and the deeply buried grounding electrode is buried in each of the one or more extraction / pulling-in steel towers from the electric station and connected to the steel tower. As a result, when a ground fault occurs in the drawer / pull-in tower, the current flows to the deep buried ground electrode, the current flowing to the ground network is reduced accordingly, and the rise in the potential of the ground network is suppressed.
【００１３】第５の発明においては、第４の発明におけ
る接地網と深埋設接地極との間が架空線により接続され
たことにより、接地網と深埋設接地極との間の抵抗値が
小さくなり接地網の電位上昇がわずかになる。In the fifth invention, the ground wire and the deep buried ground electrode in the fourth invention are connected by an overhead wire, so that the resistance value between the ground net and the deep buried ground electrode is small. Therefore, the potential rise of the grounding net becomes slight.
【００１４】[0014]
【実施例】以下、図によって本発明の実施例を説明す
る。図１は第１および第２の発明に係る第１の実施例の
説明図である。この実施例は、地表からの深さ０．７〜
１．５ｍの深さに接地網１１を埋設するとともに、接地
網１１から水平距離にして２０〜１００ｍほど離れた位
置に、３本の深埋設接地極２５を地表から２０〜１００
ｍの深さに埋設する。これら深埋設接地極２５は地中で
３本を接続した後、電線２６により接地網１１と接続す
る。また、電線２６は、絶縁することも可能である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions. In this example, the depth from the ground surface is 0.7 to
The grounding net 11 is buried at a depth of 1.5 m, and three deeply buried grounding electrodes 25 are located 20 to 100 m away from the ground surface at a position apart from the grounding net 11 by a horizontal distance of about 20 to 100 m.
Buried to a depth of m. These three deeply buried ground electrodes 25 are connected to the ground network 11 by electric wires 26 after connecting three in the ground. The electric wire 26 can also be insulated.
【００１５】図２は同じく第１および第２の発明に係る
第２の実施例の説明図である。この実施例は、地表から
の深さ０．７〜１．５ｍの深さに接地網１１を埋設する
とともに、接地網１１から水平距離にして１０〜２００
０ｍほど離れた位置に、３本の深埋設接地極２５を地表
から２０〜１００ｍの深さに埋設する。これら深埋設接
地極２５と地表からの深さ０．７〜１．０ｍの深さまで
間を絶縁管２７で被覆した電線２８により接続する。電
線２８は上端で電線２９に接続してから接地網１１と接
続する。なお、絶縁管２７としては、ＶＰまたはＥＰ等
の合成樹脂管を用いる。FIG. 2 is an explanatory view of a second embodiment according to the first and second inventions. In this embodiment, the grounding net 11 is buried at a depth of 0.7 to 1.5 m from the ground surface, and the horizontal distance from the grounding net 11 is 10 to 200.
Three deep buried ground electrodes 25 are buried at a depth of 20 to 100 m from the surface of the earth at a position separated by about 0 m. The deeply buried ground electrode 25 and the ground surface are connected to each other by a wire 28 covered with an insulating tube 27 to a depth of 0.7 to 1.0 m. The electric wire 28 is connected to the electric wire 29 at the upper end and then connected to the ground net 11. As the insulating pipe 27, a synthetic resin pipe such as VP or EP is used.
【００１６】図３は、図１および図２の実施例の等価回
路図である。接地抵抗ＲはＶ／Ｉとして求められるが、
故障電流Ｉが通電される場所からみた接地網１１の接地
抵抗を見掛け抵抗Ｒｍとし、深埋設接地極２５の抵抗を
ＲDとして、抵抗ＲDを抵抗Ｒｍよりも小さく設定する
と、故障電流ｉ2は接地抵抗の小さい深埋設接地極２５
へ流れる。すなわち、接地網１１の端部ＲEの電圧Ｖ
Eは、接地網１１の電圧Ｖmより小さくなり、さらに深埋
設接地極２５の接地効果により接地網１１の電位上昇が
軽減される。FIG. 3 is an equivalent circuit diagram of the embodiment of FIGS. 1 and 2. The ground resistance R is calculated as V / I,
If the ground resistance of the grounding net 11 as seen from the place where the fault current I is conducted is set as the apparent resistance Rm, the resistance of the deep buried ground electrode 25 is set as R D , and the resistance R D is set smaller than the resistance Rm, the fault current i 2 Is a deep buried ground electrode 25 with a small ground resistance.
Flows to. That is, the voltage V at the end R E of the ground network 11
E becomes smaller than the voltage V m of the ground net 11, and the potential increase of the ground net 11 is reduced by the grounding effect of the deeply buried ground electrode 25.
【００１７】図４は、第３の発明に係る第３の実施例の
説明図である。図において、接地網３１は、約２０ｍ間
隔で縦横に電線を埋設し、各交差点を接続するとともに
各端部を外周の電線に接続して、電線をメッシュ状に埋
設する。このとき、外周部３２と中心部３３に配設され
る電線をともに３本として、互いに近接して埋設する。
それにより、外周部３２と中心部３３については電線の
接触表面積が単純比較で他の部分の３倍になり、その分
抵抗値が少なくなる。なお、このように、埋設される電
線数を増しても、工事の際の掘削溝の本数は、従来と同
じであるため、工事費はわずかの増加だけですむ。FIG. 4 is an explanatory view of a third embodiment according to the third invention. In the figure, the grounding net 31 embeds electric wires vertically and horizontally at intervals of about 20 m, connects each intersection, and connects each end to an electric wire on the outer circumference to embed the electric wires in a mesh shape. At this time, three electric wires are provided in the outer peripheral portion 32 and the central portion 33, and are embedded close to each other.
As a result, the contact surface area of the electric wire in the outer peripheral portion 32 and the central portion 33 is three times that in the other portions in a simple comparison, and the resistance value is reduced accordingly. Even if the number of buried wires is increased in this way, the number of excavation grooves during construction is the same as the conventional one, and therefore the construction cost is only slightly increased.
【００１８】図５は、第４の発明に係る第４の実施例の
説明図である。図において、電気所１２の敷地内に接地
網１１を埋設するとともに、電気所１２から引き出され
た電線を支持する鉄塔１８，１９にそれぞれ上部を絶縁
した深埋設接地極３８，３９を所定深度以上に埋設して
接続する。さらに、それぞれ深埋設接地極３８，３９を
絶縁電線３７を介して接地網１１に接続する。この実施
例では、故障電流ｉ2が接地抵抗の小さい深埋設接地極
３８，３９に流れるため、その分、接地網１１に流れる
電流が減り、電圧の上昇が抑えられる。すなわち、電気
所１２の接地面積が狭かったり、接地網１１が埋設され
た電気所１２下方の地下地質の固有抵抗が大きい場合で
も、故障電流ｉ2の流入による接地網１１の電位上昇が
軽減される。FIG. 5 is an explanatory view of the fourth embodiment according to the fourth invention. In the figure, the grounding net 11 is buried in the site of the electric substation 12, and the deeply buried grounding electrodes 38, 39 having upper portions insulated from the steel towers 18, 19 supporting the electric wires drawn out from the electric substation 12 have a predetermined depth or more. Buried in and connected. Further, the deep-buried ground electrodes 38, 39 are connected to the ground network 11 via the insulated wire 37, respectively. In this embodiment, the fault current i 2 flows through the deep buried ground electrodes 38, 39 having a small ground resistance, so that the current flowing through the ground network 11 is correspondingly reduced and the rise in voltage is suppressed. That is, even if the grounding area of the electric station 12 is small or the specific resistance of the underground geology below the electric station 12 in which the grounding network 11 is buried is large, the potential rise of the grounding network 11 due to the inflow of the fault current i 2 is reduced. It
【００１９】図６は、第５の発明に係る第５の実施例の
説明図である。この実施例は、図５の実施例と同様に、
電気所１２の敷地内に接地網１１を埋設するとともに、
電気所１２から引き出された電線を支持する鉄塔１８，
１９にそれぞれ上部を絶縁した深埋設接地極３８，３９
を所定深度以上に埋設して接続する。さらに、鉄塔１
８，１９上に架空電線４０が架設して、それぞれ鉄塔１
８，１９と接続するとともに電気所１２内において接地
網１１に接続する。この実施例は、図５の実施例におけ
る絶縁電線３７を架空電線４０に置き換えたものであ
り、同様な効果が得られるとともに、電気所１２、鉄塔
１８，１９の間が地形的に電線を埋設できない場合に有
効である。FIG. 6 is an explanatory view of the fifth embodiment according to the fifth invention. This embodiment is similar to the embodiment of FIG.
In addition to burying the grounding net 11 in the site of the electric station 12,
A steel tower 18 supporting electric wires drawn from the electric power station 12,
The deep buried grounding electrodes 38 and 39 with their upper parts insulated from each other
Is buried to a predetermined depth or more and connected. Furthermore, the steel tower 1
The overhead electric wires 40 are erected on 8 and 19, and the steel tower 1
8 and 19, and also to the grounding network 11 in the electric station 12. In this embodiment, the insulated electric wire 37 in the embodiment of FIG. 5 is replaced by an overhead electric wire 40, and the same effect is obtained, and the electric wire is topographically buried between the electric station 12 and the towers 18 and 19. It is effective when you cannot do it.
【００２０】[0020]
【発明の効果】以上述べたように第１の発明によれば、
地表近くにメッシュ状に接地網を埋設するとともに、こ
の接地網と充分な距離を隔てた位置に、地表部を絶縁し
て地中部に単独または複数の深埋設接地極を埋設し、接
地網と深埋設接地極とを電線により接続する。それによ
り、故障電流は深埋設接地極側に多く流れて、その分接
地網の電圧上昇が小さくなる。As described above, according to the first invention,
A grounding mesh is buried near the surface of the ground, and the ground surface is insulated at a sufficient distance from this grounding net to bury one or more deeply buried grounding electrodes in the ground. Connect to the deep buried ground electrode by an electric wire. As a result, a large amount of fault current flows to the deep buried ground electrode side, and the increase in the voltage of the ground network is reduced accordingly.
【００２１】第２の発明によれば、第１発明における深
埋設接地極の接地抵抗を接地網の見掛け接地抵抗値以下
としたことにより、故障電流が深埋設接地極側に確実に
多く流れて、その分、接地網の電圧上昇がより小さくな
る。According to the second invention, by setting the ground resistance of the deep buried ground electrode in the first invention to be equal to or less than the apparent ground resistance value of the ground network, a large amount of fault current can surely flow to the deep buried ground electrode side. Therefore, the voltage rise of the ground network becomes smaller accordingly.
【００２２】第３の発明によれば、第１または第２の発
明における接地網の外周部および中央部に複数の電線を
近接させて埋設したことにより、単位面積当たりの埋設
電線長が増して接地網の見掛け接地抵抗値が小さくな
る。According to the third invention, by embedding a plurality of electric wires close to each other in the outer peripheral portion and the central portion of the grounding net in the first or second invention, the embedded electric wire length per unit area is increased. The apparent ground resistance value of the ground network is reduced.
【００２３】第４の発明によれば、第１または第２また
は第３の発明において、接地網を電気所に埋設し、深埋
設接地極を電気所よりの１以上の引出し・引込み鉄塔ご
とに埋設して鉄塔と接続したことにより、故障電流は深
埋設接地極に流れ、その分接地網に流れる電流が減り、
接地網の電位の上昇が抑えられる。すなわち、接地面積
が狭かったり、地下地質の固有抵抗が大きいようなとこ
ろであっても接地網の接地能力が補完されることにより
電気所の設置が可能になる。According to a fourth aspect of the present invention, in the first, second or third aspect, a grounding net is buried in an electric power station, and a deep buried grounding electrode is provided for each of one or more extraction / pull-in steel towers from the electric power station. By burying it and connecting it to the steel tower, the fault current flows to the deep buried grounding electrode, and the current flowing to the grounding network is reduced accordingly.
The rise of the potential of the grounding net is suppressed. That is, even in a place where the grounding area is small or the underground geology has a large specific resistance, the grounding capacity of the grounding network is supplemented, so that an electric station can be installed.
【００２４】第５の発明によれば、第４の発明におい
て、接地網と深埋設接地極との間を架空線により接続し
たことにより、その分、接地網と深埋設接地極との間の
抵抗値が小さくなり電位上昇がわずかになる。According to the fifth invention, in the fourth invention, the ground network and the deep buried ground electrode are connected by an overhead wire, so that the ground network and the deep buried ground electrode are connected by that amount. The resistance becomes smaller and the potential rises slightly.
【図面の簡単な説明】[Brief description of drawings]
【図１】第１および第２の発明に係る第１の実施例の説
明図である。FIG. 1 is an explanatory diagram of a first embodiment according to the first and second inventions.
【図２】第１および第２の発明に係る第２の実施例の説
明図である。FIG. 2 is an explanatory diagram of a second embodiment according to the first and second inventions.
【図３】図１および図２の実施例の動作を説明する等価
回路図である。FIG. 3 is an equivalent circuit diagram illustrating the operation of the embodiment of FIGS. 1 and 2.
【図４】第３の発明に係る第３の実施例の説明図であ
る。FIG. 4 is an explanatory diagram of a third embodiment according to the third invention.
【図５】第４の発明に係る第４の実施例の説明図であ
る。FIG. 5 is an explanatory diagram of a fourth embodiment according to the fourth invention.
【図６】第５の発明に係る第５の実施例の説明図であ
る。FIG. 6 is an explanatory diagram of a fifth embodiment according to the fifth invention.
【図７】従来の電気所における接地の説明図である。FIG. 7 is an explanatory diagram of grounding in a conventional electric station.
【図８】従来の電気所および送電路における接地電流測
定実験を示す説明図である。FIG. 8 is an explanatory diagram showing a ground current measurement experiment in a conventional electric station and power transmission path.
【符号の説明】 １１ 接地網 １２ 電気所 １８，１９ 鉄塔 ２５ 深埋設接地極 ２６ 電線 ２７ 絶縁管 ２８ 電線 ２９ 電線 ３１ 接地網 ３２ 外周部 ３３ 中心部 ３７ 絶縁電線 ３８，３９ 深埋設接地極 ４０ 架空電線[Explanation of Codes] 11 Grounding Network 12 Electricity Station 18, 19 Steel Tower 25 Deeply Embedded Grounding Electrode 26 Electric Wire 27 Insulation Tube 28 Electric Wire 29 Electric Wire 31 Grounding Net 32 Outer Part 33 Center Part 37 Insulated Electric Wire 38, 39 Deep Buried Grounding Electrode 40 Overhead Electrical wire
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図７[Name of item to be corrected] Figure 7
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図７】 [Figure 7]
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図８[Correction target item name] Figure 8
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図８】 [Figure 8]
【手続補正４】[Procedure amendment 4]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図９[Correction target item name] Figure 9
【補正方法】削除[Correction method] Delete
Claims (6)
るとともに、この接地網と充分な距離を隔てた位置に、
地表部を絶縁して地中部に単独または複数の深埋設接地
極を埋設し、接地網と深埋設接地極とを電線により接続
したことを特徴とする深埋設接地極の接地法。1. A mesh-shaped grounding net is buried near the surface of the earth, and at a position separated from the grounding net by a sufficient distance.
A grounding method for a deeply buried grounding electrode, characterized in that the ground surface is insulated and a single or a plurality of deeply buried grounding electrodes are buried in the ground, and the grounding net and the deeply buried grounding electrode are connected by electric wires.
おいて、深埋設接地極の接地抵抗を接地網の見掛け接地
抵抗値以下としたことを特徴とする深埋設接地極の接地
法。2. The grounding method for a deep buried ground electrode according to claim 1, wherein the ground resistance of the deep buried ground electrode is not more than the apparent ground resistance value of the ground network.
地極の接地法において、接地網の外周部および中央部に
複数の電線を近接させて埋設したことを特徴とする深埋
設接地極の接地法。3. The grounding method for a deeply buried grounding electrode according to claim 1 or 2, wherein a plurality of electric wires are buried close to an outer peripheral portion and a central portion of the grounding network. Grounding method.
記載の深埋設接地極の接地法において、接地網を電気所
に埋設するとともに、深埋設接地極を電気所よりの１以
上の引出し・引込み鉄塔ごとに埋設して鉄塔と接続した
ことを特徴とする深埋設接地極の接地法。4. The grounding method for a deep buried ground electrode according to any one of claims 1 to 3, wherein the grounding network is buried in the electric station, and the deep buried ground electrode is one or more from the electric station. The grounding method for deeply buried grounding electrodes is characterized in that each of the drawn-out and retracted steel towers is buried and connected to the steel tower.
おいて、接地網と深埋設接地極との間を架空線により接
続したことを特徴とする深埋設接地極の接地法。5. The grounding method for a deep buried grounding electrode according to claim 4, wherein the grounding network and the deep buried grounding electrode are connected by an overhead wire.
とのない充分な深さに接地極を埋設し、接地極から地表
までの間を絶縁された電線又は絶縁線管等により絶縁し
裸電線等により接続したことを特徴とする深埋設接地極
の接地法。6. A grounding electrode is buried at a sufficient depth so as not to be affected by a noise generation source on the surface of the earth, and insulated from the grounding electrode to the surface by an insulated wire or insulated wire tube, etc. A grounding method for deeply buried grounding electrodes, characterized in that they are connected by electric wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20294393A JPH0737669A (en) | 1993-07-23 | 1993-07-23 | Grounding method for deeply buried earth electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20294393A JPH0737669A (en) | 1993-07-23 | 1993-07-23 | Grounding method for deeply buried earth electrode |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9826494A Division JPH0757842A (en) | 1994-04-12 | 1994-04-12 | Method for grounding deeply buried cround electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0737669A true JPH0737669A (en) | 1995-02-07 |
Family
ID=16465735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20294393A Pending JPH0737669A (en) | 1993-07-23 | 1993-07-23 | Grounding method for deeply buried earth electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737669A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466595A (en) * | 2014-12-23 | 2015-03-25 | 国网浙江诸暨市供电公司 | Graphite type grounding resistance reduction module burying method |
| CN114759374A (en) * | 2022-04-25 | 2022-07-15 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
-
1993
- 1993-07-23 JP JP20294393A patent/JPH0737669A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466595A (en) * | 2014-12-23 | 2015-03-25 | 国网浙江诸暨市供电公司 | Graphite type grounding resistance reduction module burying method |
| CN114759374A (en) * | 2022-04-25 | 2022-07-15 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
| CN114759374B (en) * | 2022-04-25 | 2024-05-10 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
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