JP2008066036A - Grounding method in low-voltage distribution system - Google Patents

Grounding method in low-voltage distribution system Download PDF

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JP2008066036A
JP2008066036A JP2006240626A JP2006240626A JP2008066036A JP 2008066036 A JP2008066036 A JP 2008066036A JP 2006240626 A JP2006240626 A JP 2006240626A JP 2006240626 A JP2006240626 A JP 2006240626A JP 2008066036 A JP2008066036 A JP 2008066036A
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grounding
low
voltage distribution
building
distribution system
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JP4553261B2 (en
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Tsutomu Yamazaki
勉 山崎
Kaori Saijo
香織 西城
里枝 ▲高▼橋
Rie Takahashi
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East Japan Railway Co
Nippon Densetsu Kogyo Co Ltd
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Nippon Densetsu Kogyo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a grounding method superior in noise resistance and strong for a ground fault accident. <P>SOLUTION: This is the grounding method in a low-voltage distribution system in a building structure such as a building, and a neutral phase (N) in such a low-voltage distribution system is grounded by connecting to the building structures (20, 21) through a grounding resistance (13), and the neutral phase (N) of the low-voltage distribution system is grounded by connecting to the building structures (20, 21) through a breaker (15) and a resistor (14). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ビルなどの建造物内の低圧配電系統における接地方式に関する。   The present invention relates to a grounding method in a low voltage distribution system in a building such as a building.

近年、ビル設備においては、省エネルギー化の目的で使用されるインバータなどの回路からの高周波ノイズの発生が顕著である。また、例えばビル内のオフィスで用いられる各種情報機器においては、従来より信号電圧が低い集積回路が用いられるようになっており、非常にノイズの影響を受けやすい。   In recent years, in building facilities, generation of high frequency noise from circuits such as inverters used for the purpose of energy saving has been remarkable. For example, various information devices used in offices in buildings use integrated circuits with lower signal voltages than in the past, and are very susceptible to noise.

従来、ビル設備等の低圧配電系統において、日本ではＴＴ接地方式に近い接地方式が用いられていた。ところが、ＴＴ接地方式は、ビル構造体導電部を保護導体として使用するＴＮ接地方式に比べてノイズ耐性において劣ることが本件発明者らのノイズ調査の結果わかってきた。本件発明者らは、今後、ノイズ耐性に優れる接地方式であるＴＮ接地方式がビル設備の低圧配電系統において採用される件数が増えると予想している。なお、電力線の配電方式として、日本では主にＴＴ接地方式が採用されており、主としてＴＮ接地方式は日本以外の多くの国々で採用されている。また、以下、特に断りがない場合には、本明細書においては、ＴＮ接地方式はビル構造体導電部を保護導体として使用するものとして記載する。   Conventionally, in a low-voltage distribution system such as a building facility, a grounding method similar to a TT grounding method has been used in Japan. However, as a result of noise investigations by the present inventors, the TT grounding method is inferior in noise resistance compared to the TN grounding method in which the building structure conductive portion is used as a protective conductor. The inventors of the present invention predict that the number of TN grounding systems, which are grounding systems with excellent noise resistance, will be adopted in low-voltage distribution systems of building facilities in the future. As a power line distribution method, the TT grounding method is mainly adopted in Japan, and the TN grounding method is mainly adopted in many countries other than Japan. Further, hereinafter, unless otherwise specified, in this specification, the TN grounding method is described as using the building structure conductive portion as a protective conductor.

また、ＴＴ接地方式及びＴＮ接地方式の名称についてであるが、第一文字のＴは系統接地を施すことを意味し、ＴＴ接地方式における第二文字のＴは機器接地を（前記系統接地とは独立して）施すことを意味する。そしてＴＮ接地方式における第二文字のＮは機器接地がないこと（前記系統接地に結線して共用する）を意味している。   As for the names of the TT grounding system and the TN grounding system, the first letter T means system grounding, and the second letter T in the TT grounding system is equipment grounding (independent of the system grounding). It means). The second letter N in the TN grounding system means that there is no equipment grounding (connected to the system grounding and shared).

これらＴＴ接地方式とＴＮ接地方式を図面を参照しつつ説明する。図５は、ＴＴ接地方式を模式的に示す図であり、図６は、ＴＮ接地方式を模式的に示す図である。図５及び図６において、１０は負荷、１１は低圧配電系統におけるトランス、１２は地中に埋設される接地抵抗、２０はビルなどの建造物のコンクリート部、２１はビルなどの建造物の鉄骨部をそれぞれ示している。また、低圧配電系統において、Ｐは電圧相、Ｎはニュートラル相を示している。   These TT grounding system and TN grounding system will be described with reference to the drawings. FIG. 5 is a diagram schematically showing the TT grounding method, and FIG. 6 is a diagram schematically showing the TN grounding method. 5 and 6, 10 is a load, 11 is a transformer in a low-voltage distribution system, 12 is a grounding resistance buried in the ground, 20 is a concrete part of a building such as a building, and 21 is a steel frame of the building or the like Each part is shown. In the low voltage distribution system, P indicates a voltage phase, and N indicates a neutral phase.

ＴＮ接地方式は、建造物の構造体を接地電極として使用するのに対して、ＴＴ接地方式は、ビルなどの建造物の構造体には接地せず接地抵抗１２を地中に埋設してアースすることを特徴としている。したがって、図５に示すように、わが国で６ｋＶ受電のＴＴ接地方式では、ニュートラル相Ｎのトランス１１近傍のＡ点と１０〜３０Ωの銅板からなる接地抵抗１２とを導通するように構成する。また、図６に示すように、ＴＮ接地方式では、ニュートラル相Ｎのトランス１１近傍のＡ点と建造物の構造体である鉄骨部２１のＢ点とを導通するように構成する。   In the TN grounding system, a building structure is used as a ground electrode, whereas in the TT grounding system, the grounding resistor 12 is buried in the ground without being grounded to the building structure such as a building. It is characterized by doing. Therefore, as shown in FIG. 5, in the TT grounding system receiving 6 kV in Japan, the point A in the vicinity of the transformer 11 of the neutral phase N and the grounding resistor 12 made of a 10-30 Ω copper plate are electrically connected. As shown in FIG. 6, in the TN grounding system, the point A in the vicinity of the transformer 11 of the neutral phase N and the point B of the steel frame portion 21 which is the structure of the building are electrically connected.

以上のように構成されるＴＴ接地方式、ＴＮ接地方式のそれぞれにおいて地絡（漏電）が発生した場合について説明する。ＴＴ接地方式の場合には、地絡Ｓ0が発生したとき、地絡電流は建造物の鉄骨部２１から地中に埋設された接地抵抗１２を通り、ニュートラル相Ｎに戻るような経路をたどる（Ｓ0→Ｓ1→Ｓ2→Ｓ3→Ｓ4）。ＴＴ接地方式においては、地絡電流路に１０〜３０Ωの銅板などの接地抵抗１２が介挿されているので、地絡電流は数十Ａ に抑えることができる。一方、ＴＮ接地方式の場合には、地絡Ｓ0が発生したとき、地絡電流は建造物の鉄骨部２１から図示するよう形でニュートラル相Ｎに戻るような経路をたどる（Ｓ0→Ｓ1→Ｓ2→Ｓ3）。ＴＮ接地方式の場合には、地絡Ｓ0が発生したとき、抵抗成分が電流路に介在していないので、地絡電流は数ｋＡ という短絡電流に近い電流が流れることとなる。 A case where a ground fault (leakage) occurs in each of the TT grounding system and the TN grounding system configured as described above will be described. In the case of the TT grounding method, when the ground fault S 0 occurs, the ground fault current follows a path that returns from the steel frame portion 21 of the building to the neutral phase N through the ground resistance 12 buried in the ground. (S 0 → S 1 → S 2 → S 3 → S 4 ). In the TT grounding method, since the grounding resistance 12 such as a 10-30Ω copper plate is inserted in the grounding current path, the grounding current can be suppressed to several tens of A. On the other hand, in the case of the TN grounding method, when a ground fault S 0 occurs, the ground fault current follows a path that returns from the steel frame portion 21 of the building to the neutral phase N as shown in the figure (S 0 → S 1 → S 2 → S 3 ). In the case of the TN grounding method, when the ground fault S 0 is generated, since the resistance component is not interposed in the current path, the ground fault current flows as a short-circuit current of several kA.

上述したように、ＴＮ接地方式はＴＴ接地方式に比べてノイズ耐性に優れている接地方式である。この詳細なメカニズムについては不明な点も未だ多いが、ＴＴ接地方式がＴＮ接地方式に比べノイズ耐性に劣っているのは、ＴＴ接地方式の場合には、１０〜３０Ωの銅板などの接地抵抗１２が存在し、これにより接地抵抗１２において残留電圧が発生することに起因すると考えられている。   As described above, the TN grounding method is a grounding method that has better noise resistance than the TT grounding method. Although there are still many unclear points about this detailed mechanism, the TT grounding method is inferior to the TN grounding method in noise resistance. In the case of the TT grounding method, the grounding resistance 12 such as a 10-30Ω copper plate is used. This is considered to be caused by the occurrence of a residual voltage in the grounding resistor 12.

なお、上記のようなＴＴ接地方式や、ＪＩＳで規定する一般的なＴＮ接地方式については、例えば特許文献１（特開２００５−２７８２９９号公報）に開示されている。   Note that the TT grounding system as described above and a general TN grounding system defined by JIS are disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-278299.

ＴＴ接地方式の別態様についても説明しておく。図７は、ＴＴ接地方式の別態様を模式的に示す図である。ＴＴ接地方式では、ニュートラル相ＮのＡ点と建造物の構造体である鉄骨部２１のＢ点との間に、接地抵抗１３を介挿した構成となっている。当該態様においても、地絡Ｓ0が発生したとき、地絡電流は建造物の鉄骨部２１から接地抵抗１３を介して、ニュートラル相Ｎに戻るような経路をたどるので、地絡電流を数十Ａ に抑えることができる。
特開２００５−２７８２９９号公報 Another aspect of the TT grounding method will also be described. FIG. 7 is a diagram schematically showing another aspect of the TT grounding method. In the TT grounding method, the grounding resistor 13 is interposed between the point A of the neutral phase N and the point B of the steel frame portion 21 which is a structure of the building. Also in this mode, when the ground fault S 0 occurs, the ground fault current follows a path that returns from the steel frame portion 21 of the building to the neutral phase N via the grounding resistor 13. A can be suppressed.
JP 2005-278299 A

上記のようにＴＴ接地方式においては、地絡電流を抑制する効果が大きい反面ノイズ耐性がＴＮ接地方式に比べ劣っているという問題点があり、逆にＴＮ接地方式においては、ＴＴ接地方式に比べてノイズ耐性に勝っている反面地絡電流を抑制する効果が小さい、という問題点があった。   As described above, the TT grounding method has a problem that the effect of suppressing the ground fault current is large, but there is a problem that the noise resistance is inferior to the TN grounding method. However, it has a problem that the effect of suppressing the ground fault current is small while it is superior in noise resistance.

このような課題を解決するために、請求項１に係る発明は、建造物内の低圧配電系統における接地方式であって、低圧配電系統のニュートラル相又は系統の一線を、接地抵抗を介して建造物構造体と接続して接地すると共に、低圧配電系統のニュートラル相又は系統の一線を、遮断器及び抵抗器を介して建造物構造体と接続して接地することを特徴とする。   In order to solve such a problem, the invention according to claim 1 is a grounding method in a low-voltage distribution system in a building, and the neutral phase of the low-voltage distribution system or one line of the system is constructed through a grounding resistor. It is characterized in that the neutral phase of the low-voltage distribution system or one line of the system is connected to the building structure via a circuit breaker and a resistor and grounded while being connected to the structure structure and grounded.

また、請求項２に係る発明は、建造物内の低圧配電系統における接地方式であって、低圧配電系統のニュートラル相又は系統の一線を、接地抵抗を介して建造物構造体と接続して接地すると共に、低圧配電系統のニュートラル相又は系統の一線を、限流遮断器を介して建造物構造体と接続して接地することを特徴とする。   The invention according to claim 2 is a grounding method in a low-voltage distribution system in a building, wherein the neutral phase of the low-voltage distribution system or one line of the system is connected to the building structure via a grounding resistor and grounded. In addition, the neutral phase of the low-voltage distribution system or one line of the system is connected to the building structure via a current limiting circuit breaker and grounded.

本発明の低圧配電系統における接地方式によれば、通常時にはノイズ耐性に優れるＴＮ接地方式のような接地形態をとり、地絡事故発生時には地絡電流を抑制することができるＴＴ接地方式のような接地形態をとることができるので、ノイズ耐性に優れ、なおかつ地絡事故に対しても強い接地方式を提供することができる。   According to the grounding method in the low-voltage distribution system of the present invention, a grounding configuration such as a TN grounding method that is excellent in noise resistance is normally used, and a ground fault current can be suppressed when a ground fault occurs. Since a grounding form can be taken, it is possible to provide a grounding system that is excellent in noise resistance and strong against ground faults.

以下、本発明の実施の形態を図面を参照しつつ説明する。図１は、本発明の実施の形態に係る低圧配電系統における接地方式を模式的に示す図である。本発明の前提は、ビルなどの建造物内の低圧配電系統に係る接地方式である。図１は、単相2線式の低圧配電系統を示すものであり、図１において、１０は負荷、１１は低圧配電系統におけるトランス、１３は接地抵抗、１４は抵抗器、１５は遮断器、２０はビルなどの建造物のコンクリート部、２１はビルなどの建造物の鉄骨部をそれぞれ示している。また、低圧配電系統において、Ｐは電圧相、Ｎはニュートラル相を示している。建造物におけるコンクリート部２０や鉄骨部２１を総称して建造物構造体と称する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing a grounding method in a low-voltage distribution system according to an embodiment of the present invention. The premise of the present invention is a grounding system related to a low voltage distribution system in a building such as a building. FIG. 1 shows a single-phase two-wire low-voltage distribution system. In FIG. 1, 10 is a load, 11 is a transformer in the low-voltage distribution system, 13 is a ground resistance, 14 is a resistor, 15 is a circuit breaker, Reference numeral 20 denotes a concrete part of a building such as a building, and 21 denotes a steel frame part of the building such as a building. In the low voltage distribution system, P indicates a voltage phase, and N indicates a neutral phase. The concrete portion 20 and the steel frame portion 21 in the building are collectively referred to as a building structure.

本発明の実施の形態に係る低圧配電系統における接地方式は、ＴＮ接地方式とＴＴ接地方式とを組み合わせたような接地方式となっている。すなわち、本発明においては、ニュートラル相Ｎにおけるトランス１１近傍のＡ点と建造物の構造体である鉄骨部２１のＢ点との間に接地抵抗１３を介挿し、また、ニュートラル相Ｎのニュートラル相Ｎにおけるトランス１１近傍のＣ点と建造物の構造体である鉄骨部２１のＤ点との間には、抵抗器１４と遮断器１５を介挿するような接地形態となっている。接地抵抗１３はＢ種抵抗と呼ばれる法令により用いることが義務づけられているものである。また、抵抗器１４は遮断器１５を動作させる電流値を調整するために用いるものである。   The grounding method in the low-voltage distribution system according to the embodiment of the present invention is a grounding method in which the TN grounding method and the TT grounding method are combined. That is, in the present invention, the grounding resistor 13 is inserted between the point A near the transformer 11 in the neutral phase N and the point B of the steel frame portion 21 which is the structure of the building, and the neutral phase of the neutral phase N Between the point C in the vicinity of the transformer 11 in N and the point D of the steel frame portion 21 that is the structure of the building, a grounding configuration is provided in which a resistor 14 and a circuit breaker 15 are interposed. The ground resistor 13 is obliged to be used in accordance with a law called B-type resistor. The resistor 14 is used to adjust a current value for operating the circuit breaker 15.

次に、以上のような本発明の接地方式における動作・作用について説明する。図２及び図３は、本発明の実施の形態に係る低圧配電系統における接地方式における動作を説明する図である。図２は、地絡事故等が発生していない通常時における状態を示すものであり、図３は地絡事項が発生した時における状態を示すものである。   Next, the operation / action in the grounding system of the present invention as described above will be described. FIG.2 and FIG.3 is a figure explaining the operation | movement in the grounding system in the low voltage | pressure distribution system which concerns on embodiment of this invention. FIG. 2 shows a state at a normal time when a ground fault accident or the like does not occur, and FIG. 3 shows a state when a ground fault matter occurs.

図２に示す通常時においては、遮断器１５は閉じられており、ＴＮ接地方式と同じようにニュートラル相Ｎと建造物の構造体である鉄骨部２１とが導通し、接地されるような構成となっている。したがって、本発明の接地方式においては、通常時、ノイズ耐性に優れている接地方式であるＴＮ接地方式と同じ効果を享受することができる。   In the normal state shown in FIG. 2, the circuit breaker 15 is closed, and the neutral phase N and the steel part 21 which is the structure of the building are electrically connected and grounded as in the TN grounding system. It has become. Therefore, in the grounding system of the present invention, the same effect as that of the TN grounding system, which is a grounding system that is excellent in noise resistance, can be obtained in normal times.

図３に示す地絡事故発生時においては、遮断器１５の動作によってＣ−Ｄ間はオープンとなる。したがって、本発明の接地方式においては、地絡時、地絡電流を抑制することができるＴＴ接地方式と同様のメリットがある。本発明においては、地絡Ｓ0が発生したとき、地絡電流は建造物の鉄骨部２１から地中に埋設された接地抵抗１３を通り、ニュートラル相Ｎに戻るような経路をたどる（Ｓ0→Ｓ1→Ｓ2→Ｓ3）。このように地絡電流は、接地抵抗１３を電路とするようになっているために、地絡電流を数十Ａ に抑えることができる。 At the time of occurrence of the ground fault shown in FIG. 3, C-D is opened by the operation of the circuit breaker 15. Therefore, the grounding system of the present invention has the same merit as the TT grounding system that can suppress the ground fault current at the time of ground fault. In the present invention, when a ground fault S 0 occurs, the ground fault current follows a path from the steel frame portion 21 of the building through the ground resistance 13 buried in the ground and back to the neutral phase N (S 0). → S 1 → S 2 → S 3 ). Thus, the ground fault current can be suppressed to several tens of A since the grounding resistor 13 is used as an electric circuit.

以上、本発明の低圧配電系統における接地方式によれば、通常時にはノイズ耐性に優れるＴＮ接地方式のような接地形態をとり、地絡事故発生時には地絡電流を抑制することができるＴＴ接地方式のような接地形態をとることができるので、ノイズ耐性に優れ、なおかつ地絡事故に対しても強い接地方式を提供することができる。   As described above, according to the grounding system in the low-voltage distribution system of the present invention, the TT grounding system that can take a grounding form such as a TN grounding system that is excellent in noise resistance in a normal state and can suppress a ground fault current when a ground fault occurs. Therefore, it is possible to provide a grounding method that is excellent in noise resistance and strong against ground faults.

なお、本実施形態においては単相２線式を例に挙げて説明したが、本発明は三相３線式や単相３線式などの低圧配電系統における場合にも用いることができることは言うまでもない。なお、三相３線式や単相３線式などの場合には、単相２線式における「ニュートラル相Ｎ」という概念はないので、三相３線式や単相３線式などに本発明を適用する場合は、系統の一線を、単相２線式におけるニュートラル相Ｎ同様に接地すればよい。   In the present embodiment, a single-phase two-wire system has been described as an example, but it goes without saying that the present invention can also be used in a low-voltage distribution system such as a three-phase three-wire system or a single-phase three-wire system. Yes. In the case of a three-phase three-wire system or a single-phase three-wire system, there is no concept of “neutral phase N” in a single-phase two-wire system. When the invention is applied, one line of the system may be grounded like the neutral phase N in the single-phase two-wire system.

次に本発明の他の実施の形態を図面を参照しつつ説明する。図４は、本発明の他の実施の形態に係る低圧配電系統における接地方式を模式的に示す図である。図４は、単相2線式の低圧配電系統を示すものであり、図４において、１０は負荷、１１は低圧配電系統におけるトランス、１３は接地抵抗、１６は限流遮断器、２０はビルなどの建造物のコンクリート部、２１はビルなどの建造物の鉄骨部をそれぞれ示している。また、低圧配電系統において、Ｐは電圧相、Ｎはニュートラル相を示している。建造物におけるコンクリート部２０や鉄骨部２１を総称して建造物構造体と称する。   Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a diagram schematically showing a grounding method in a low-voltage distribution system according to another embodiment of the present invention. FIG. 4 shows a single-phase two-wire low-voltage distribution system. In FIG. 4, 10 is a load, 11 is a transformer in the low-voltage distribution system, 13 is a grounding resistance, 16 is a current limiting circuit breaker, and 20 is a building. A concrete part of a building such as, and 21 indicate a steel frame part of a building such as a building. In the low voltage distribution system, P indicates a voltage phase, and N indicates a neutral phase. The concrete portion 20 and the steel frame portion 21 in the building are collectively referred to as a building structure.

本実施形態が先に実施形態と異なる点は、Ｃ−Ｄ間に限流遮断器１６を用いた点である。この限流遮断器１６は、地絡事故発生時に、アークによってエネルギーを消費させることによって全体に流れる電流を制御するものである。本実施形態における作用も、先の実施形態と同様で、通常時においては閉となっている限流遮断器１６により、Ｃ−Ｄ間が短絡してＴＮ接地方式のメリットを享受することができ、地絡事故発生時においては、限流遮断器１６が開となり、地絡電流は接地抵抗１３の経路（Ａ−Ｂ間）を通ることで、地絡電流の抑制を図ることができる。   This embodiment is different from the previous embodiment in that a current limiting breaker 16 is used between C and D. This current limiting circuit breaker 16 controls the current flowing through the whole by consuming energy by an arc when a ground fault occurs. The operation in this embodiment is the same as in the previous embodiment, and the current-limiting circuit breaker 16 which is normally closed can short-circuit between C and D and enjoy the benefits of the TN grounding method. When a ground fault occurs, the current limiting breaker 16 is opened, and the ground fault current can be suppressed by passing through the path of the ground resistor 13 (between A and B).

以上、本発明の他の実施形態の低圧配電系統における接地方式によれば、通常時にはノイズ耐性に優れるＴＮ接地方式のような接地形態をとり、地絡事故発生時には地絡電流を抑制することができるＴＴ接地方式のような接地形態をとることができるので、ノイズ耐性に優れ、なおかつ地絡事故に対しても強い接地方式を提供することができる。   As described above, according to the grounding method in the low-voltage distribution system according to another embodiment of the present invention, the grounding method such as the TN grounding method that is excellent in noise resistance is normally used, and the ground fault current is suppressed when a ground fault occurs. Since it can take a grounding form such as a TT grounding method, it is possible to provide a grounding method that is excellent in noise resistance and strong against ground faults.

なお、本実施形態においては単相２線式を例に挙げて説明したが、本発明は三相３線式や単相３線式などの低圧配電系統における接地の場合にも用いることができることは言うまでもない。なお、三相３線式や単相３線式などの場合には、単相２線式における「ニュートラル相Ｎ」という概念はないので、三相３線式や単相３線式などに本発明を適用する場合は、系統の一線を、単相２線式におけるニュートラル相Ｎ同様に接地すればよい。   In this embodiment, a single-phase two-wire system has been described as an example. However, the present invention can also be used for grounding in a low-voltage distribution system such as a three-phase three-wire system or a single-phase three-wire system. Needless to say. In the case of a three-phase three-wire system or a single-phase three-wire system, there is no concept of “neutral phase N” in a single-phase two-wire system. When the invention is applied, one line of the system may be grounded like the neutral phase N in the single-phase two-wire system.

本発明の実施の形態に係る低圧配電系統における接地方式を模式的に示す図である。It is a figure which shows typically the grounding system in the low voltage | pressure distribution system which concerns on embodiment of this invention. 本発明の実施の形態に係る低圧配電系統における接地方式（通常時）における動作を説明する図である。It is a figure explaining the operation | movement in the earthing | grounding system (normal time) in the low voltage | pressure distribution system which concerns on embodiment of this invention. 本発明の実施の形態に係る低圧配電系統における接地方式（地絡時）における動作を説明する図である。It is a figure explaining the operation | movement in the grounding system (at the time of a ground fault) in the low voltage | pressure distribution system which concerns on embodiment of this invention. 本発明の他の実施の形態に係る低圧配電系統における接地方式を模式的に示す図である。It is a figure which shows typically the grounding system in the low voltage | pressure distribution system which concerns on other embodiment of this invention. ＴＴ接地方式を模式的に示す図である。It is a figure which shows a TT grounding system typically. ＴＮ接地方式を模式的に示す図である。It is a figure which shows a TN grounding system typically. ＴＴ接地方式の別態様を模式的に示す図である。It is a figure which shows typically the other aspect of a TT grounding system.

符号の説明Explanation of symbols

１０・・・負荷、１１・・・トランス、１２・・・接地抵抗、１３・・・接地抵抗（Ｂ種抵抗）、１４・・・抵抗器、１５・・・遮断器、１６・・・限流遮断器、２０・・・コンクリート部、２１・・・鉄骨部 DESCRIPTION OF SYMBOLS 10 ... Load, 11 ... Transformer, 12 ... Grounding resistance, 13 ... Grounding resistance (class B resistance), 14 ... Resistor, 15 ... Circuit breaker, 16 ... Limit Current breaker, 20 ... concrete part, 21 ... steel frame part

Claims (2)

建造物内の低圧配電系統における接地方式であって、
低圧配電系統のニュートラル相又は系統の一線を、接地抵抗を介して建造物構造体と接続して接地すると共に、低圧配電系統のニュートラル相又は系統の一線を、遮断器及び抵抗器を介して建造物構造体と接続して接地することを特徴とする低圧配電系統における接地方式。 A grounding method in a low-voltage distribution system in a building,
Connect the neutral phase of the low-voltage distribution system or one line of the system to the building structure via a grounding resistor and ground it, and construct the neutral phase or system line of the low-voltage distribution system via a circuit breaker and resistor. A grounding method in a low-voltage distribution system, characterized by connecting to a structure and grounding. 建造物内の低圧配電系統における接地方式であって、
低圧配電系統のニュートラル相又は系統の一線を、接地抵抗を介して建造物構造体と接続して接地すると共に、低圧配電系統のニュートラル相又は系統の一線を、限流遮断器を介して建造物構造体と接続して接地することを特徴とする低圧配電系統における接地方式。 A grounding method in a low-voltage distribution system in a building,
The neutral phase of the low-voltage distribution system or one line of the system is connected to the building structure via a grounding resistor and grounded, and the neutral phase or system line of the low-voltage distribution system is connected to the building via a current limiting circuit breaker. A grounding method in a low-voltage distribution system characterized by connecting to a structure and grounding.
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KR101056535B1 (en) 2009-05-27 2011-08-12 한국 전기안전공사 Ground Simulation Circuit and Device of Low Voltage Wiring System
KR20160015425A (en) * 2014-07-30 2016-02-15 한국 전기안전공사 Low-voltage open phase circuit breaker for PEN conductor in TN-C-S grounding system

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JPS5388994A (en) * 1977-01-17 1978-08-04 Hitachi Cable Ltd Cable line
JPS5943070U (en) * 1982-09-14 1984-03-21 株式会社東芝 earthing device
JPS6248685U (en) * 1985-09-12 1987-03-25
JPH06104066A (en) * 1992-09-24 1994-04-15 Hitachi Electron Service Co Ltd High frequency grounding method for electronic apparatus
JPH07169516A (en) * 1993-12-17 1995-07-04 Showa Electric Wire & Cable Co Ltd Grounding device for equipment
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KR101056535B1 (en) 2009-05-27 2011-08-12 한국 전기안전공사 Ground Simulation Circuit and Device of Low Voltage Wiring System
KR20160015425A (en) * 2014-07-30 2016-02-15 한국 전기안전공사 Low-voltage open phase circuit breaker for PEN conductor in TN-C-S grounding system
KR101599787B1 (en) 2014-07-30 2016-03-08 한국 전기안전공사 Low-voltage open phase circuit breaker for PEN conductor in TN-C-S grounding system

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