JP2008130986A - Lightning protection method for electric facility - Google Patents

Lightning protection method for electric facility Download PDF

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JP2008130986A
JP2008130986A JP2006317359A JP2006317359A JP2008130986A JP 2008130986 A JP2008130986 A JP 2008130986A JP 2006317359 A JP2006317359 A JP 2006317359A JP 2006317359 A JP2006317359 A JP 2006317359A JP 2008130986 A JP2008130986 A JP 2008130986A
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lightning
transformer
iron core
load device
resistant transformer
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Takashi Kudo
剛史 工藤
Toru Hirai
徹 平井
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Otowa Electric Co Ltd
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Otowa Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent lightening current from spreading into loading apparatuses even when a lightening resistant transformer is broken by lightening surge exceeding the insulating strength of the lightening resistant transformer, in an electric facility where a lightening resistant transformer is installed. <P>SOLUTION: A method for protecting the electric facility from lightening comprises: placing an iron core 27 arranged between input winding 25 and an output winding 26; and arranging a lightening resistant transformer 24 between an input power supply wire 22 and the loading apparatus 23 storing an electrostatic shielding 28 arranged between the iron core 27 and at least the output winding 26, in a housing 34. The method comprises: placing the lightening resistant transformer 24 through an insulating member 41 in a structure 21; and earthing the iron core and the housing 34 of the lightening resistant transformer 24 by an insulating electric wire 42, which is different from an insulating electric wire 44 that connects the electrostatic shielding 28 and the loading apparatus 23 to ground. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、構築物内で耐雷変圧器を入力電源線と負荷機器との間に設置された電気施設、例えば無線中継所や高度情報化ビル、ハイテク工場などを含む全ての電気施設において、耐雷変圧器の絶縁強度を超えた雷サージから負荷機器を保護する電気施設の耐雷方法に関する。   The present invention provides a lightning-resistant transformer in all electrical facilities including a lightning-resistant transformer installed between an input power line and a load device in a structure, such as a wireless relay station, an advanced information building, and a high-tech factory. The present invention relates to a lightning protection method for an electrical facility that protects a load device from a lightning surge exceeding the insulation strength of the device.

例えば、無線中継所や高度情報化ビル、ハイテク工場などを含む全ての電気施設においては、半導体システム等の負荷機器を雷サージから保護する耐雷対策が必要である。この耐雷対策は、雷サージに弱い半導体システム等の負荷機器に対して雷撃による影響をできる限り与えないようにするエネルギー処理対策で、構築物内で入力電源線と負荷機器との間に耐雷変圧器を設置するようにしている。   For example, in all electrical facilities including wireless relay stations, advanced information-oriented buildings, high-tech factories, etc., lightning protection measures are required to protect load devices such as semiconductor systems from lightning surges. This lightning protection measure is an energy treatment measure that minimizes the impact of lightning strikes on load devices such as semiconductor systems that are vulnerable to lightning surges. Lightning-proof transformers between input power lines and load devices in the structure. Is installed.

図６は、電気施設の構築物１内で入力電源線２と負荷機器３との間に耐雷変圧器４を設置した耐雷対策例を示す。同図に示すように構築物１外部の柱上変圧器（図示せず）からの低圧電力を構築物１内部の複数の負荷機器３に供給する入力電源線２とそれら負荷機器３との間に耐雷変圧器４を設置している。   FIG. 6 shows an example of lightning protection measures in which a lightning-resistant transformer 4 is installed between the input power line 2 and the load device 3 in the structure 1 of the electrical facility. As shown in the figure, lightning protection is provided between the input power line 2 for supplying low voltage power from a pole transformer (not shown) outside the structure 1 to a plurality of load devices 3 inside the structure 1 and the load devices 3. A transformer 4 is installed.

この耐雷変圧器４は、入力巻線５（一次巻線）と、出力巻線６（二次巻線）と、それら入力巻線５と出力巻線６間に介在した鉄心７とで主要部が構成され、例示した耐雷変圧器４では、鉄心７と出力巻線６との間に静電遮蔽板８が配置されている。また、入力巻線５の入力側電源端子９間、および出力巻線６の出力側電源端子１０間には線間避雷器１１，１２が設けられている。   The lightning resistant transformer 4 includes an input winding 5 (primary winding), an output winding 6 (secondary winding), and an iron core 7 interposed between the input winding 5 and the output winding 6. In the illustrated lightning resistant transformer 4, the electrostatic shielding plate 8 is disposed between the iron core 7 and the output winding 6. Further, line lightning arresters 11 and 12 are provided between the input side power supply terminals 9 of the input winding 5 and between the output side power supply terminals 10 of the output winding 6.

この耐雷変圧器４による耐雷対策では、耐雷変圧器４の鉄心７および静電遮蔽板８の筐体接地を負荷機器３の主接地１３に接続するようにしている。この負荷機器３の主接地１３では、耐雷変圧器４の筐体１４から延びる絶縁電線１８を構築物１の近傍に打設された接地極１９に接続している。   In the lightning protection measures by the lightning resistant transformer 4, the grounding of the iron core 7 and the electrostatic shielding plate 8 of the lightning resistant transformer 4 is connected to the main ground 13 of the load device 3. In the main ground 13 of the load device 3, an insulated wire 18 extending from the housing 14 of the lightning proof transformer 4 is connected to a ground electrode 19 placed in the vicinity of the structure 1.

なお、この耐雷変圧器４は、構築物１の内部で金属製筐体１４を床に直置きするようにして設置されるのが通常である。また、図中の符号１５，１６は、低圧受電設備である受電箱と開閉器盤であり、受電箱１５は構築物１の外部で入力電源線２に介挿され、開閉器盤１６は構築物１の内部で入力電源線２に介挿されている。これら受電箱１５および開閉器盤１６は、通常、Ｄ種接地されている。   The lightning resistant transformer 4 is usually installed in such a manner that the metal casing 14 is placed directly on the floor inside the structure 1. Reference numerals 15 and 16 in the figure denote a power receiving box and a switch board, which are low-voltage power receiving equipment. The power receiving box 15 is inserted into the input power line 2 outside the structure 1, and the switch board 16 is the structure 1 Is inserted in the input power line 2. The power receiving box 15 and the switch board 16 are normally grounded in D type.

図６に示す耐雷変圧器４による耐雷対策以外にも、特許文献１に開示された耐雷変圧器による耐雷対策がある。この耐雷対策では、負荷機器に接続する入力電源線と負荷機器の間に、入力巻線と出力巻線の各々に互いに絶縁され独立した静電遮蔽板を有する耐雷変圧器を設け、この耐雷変圧器の出力巻線側の静電遮蔽板を負荷機器の主接地に接続する一方、入力巻線側の静電遮蔽板を入力電源線のゼロ電位線に接続するようにしている。これにより、耐雷変圧器の入力側と出力側の電位が分離され、その耐雷変圧器の入力側からの雷電流が、その出力側に接続された負荷機器に流れるルートを遮断することができる。
特許第２７６４００８号公報 In addition to the lightning protection measures by the lightning protection transformer 4 shown in FIG. 6, there is a lightning protection measure by the lightning protection transformer disclosed in Patent Document 1. In this lightning protection measure, between the input power line connected to the load device and the load device, a lightning protection transformer having an independent electrostatic shielding plate is provided for each of the input winding and the output winding. The electrostatic shielding plate on the output winding side of the device is connected to the main ground of the load device, while the electrostatic shielding plate on the input winding side is connected to the zero potential line of the input power line. Thereby, the electric potential of the input side and output side of a lightning-resistant transformer is isolate | separated, and the route | root which the lightning current from the input side of the lightning-resistant transformer flows to the load apparatus connected to the output side can be interrupted | blocked.
Japanese Patent No. 2764008

ところで、前述した耐雷変圧器による耐雷対策のいずれにおいても、例えば図６に示す耐雷変圧器４が設置された電気施設に非常に大きな落雷があった場合、その構築物１の内部に設置された耐雷変圧器４に非常に大きな過電圧が加わってその耐雷変圧器４の絶縁強度を超え、耐雷変圧器４が稀に破損することがある。   By the way, in any of the lightning protection measures using the lightning-resistant transformer described above, for example, if there is a very large lightning strike in the electrical facility where the lightning-resistant transformer 4 shown in FIG. 6 is installed, the lightning protection installed in the structure 1 A very large overvoltage is applied to the transformer 4 to exceed the insulation strength of the lightning-resistant transformer 4, and the lightning-resistant transformer 4 may be damaged rarely.

この場合、耐雷変圧器４の入力電源端子９から耐雷変圧器４の筐体１４に放電する。ここで、耐雷変圧器４が構築物１の床１７に直置きされていることから、その構築物１の床１７に埋設された鉄筋（図示せず）などを通って雷電流が負荷機器３に流れることがある（図中Ａ矢印参照）。   In this case, the lightning-resistant transformer 4 is discharged from the input power supply terminal 9 to the casing 14 of the lightning-resistant transformer 4. Here, since the lightning resistant transformer 4 is placed directly on the floor 17 of the structure 1, a lightning current flows to the load device 3 through a reinforcing bar (not shown) embedded in the floor 17 of the structure 1. (See arrow A in the figure).

また、耐雷変圧器４の筐体１４が負荷機器３の主接地１３に接続されていることから、その負荷機器３の主接地１３に雷電流が流れることになる（図中Ｂ矢印参照）。通常、負荷機器３は複数存在し、それら複数の負荷機器３間は接地線のみならず電源線や信号線で接続されており、雷電流が負荷機器３の主接地１３に流れた場合、負荷機器３間に電位差が発生して負荷機器３に被害が発生するという問題があった。   Moreover, since the housing 14 of the lightning resistant transformer 4 is connected to the main ground 13 of the load device 3, a lightning current flows through the main ground 13 of the load device 3 (see arrow B in the figure). Usually, there are a plurality of load devices 3, and the load devices 3 are connected not only by a ground line but also by a power line or a signal line, and when a lightning current flows to the main ground 13 of the load device 3, There is a problem that a potential difference is generated between the devices 3 and the load device 3 is damaged.

これに対して、放電耐量の大きな対地間避雷器を耐雷変圧器４の入力側に設置する対策方法が一般的であるが、その対地間避雷器を通過した雷電流が大地を介して負荷機器３に侵入し被害を与えるおそれがある。また、この対地間避雷器が破損した場合には耐雷変圧器４を保護する手段がなくなることになる。例えば、無人施設では対地間避雷器の復旧までに時間がかかり、その間に次の落雷が発生する可能性もあり、さらに被害発生の危険性が伴うことになる。   On the other hand, a countermeasure method for installing a ground arrester having a large discharge withstand capability on the input side of the lightning transformer 4 is generally used, but the lightning current passing through the ground surge arrester passes through the ground to the load device 3. There is a risk of intrusion and damage. In addition, when this ground arrester is damaged, there is no means for protecting the lightning-resistant transformer 4. For example, in an unmanned facility, it takes time to restore the ground lightning arrester, and the next lightning strike may occur during that time, and there is a risk of damage.

そこで、本発明は前述の問題点に鑑みて提案されたもので、その目的とするところは、耐雷変圧器を設置した電気施設において、その耐雷変圧器の絶縁強度を超える雷サージにより耐雷変圧器が破壊した場合でも、雷電流による負荷機器への波及を抑制し得る電気施設の耐雷方法を提供することにある。   Accordingly, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a lightning-resistant transformer in an electrical facility where a lightning-resistant transformer is installed due to a lightning surge exceeding the insulation strength of the lightning-resistant transformer. An object of the present invention is to provide a lightning protection method for an electrical facility that can suppress the spread of lightning current to a load device even if it is destroyed.

前述の目的を達成するための技術的手段として、本発明は、入力巻線と出力巻線との間に配された鉄心およびその鉄心と少なくとも出力巻線との間に配された静電遮蔽板が筐体に格納された耐雷変圧器を入力電源線と負荷機器との間に設けた電気施設の耐雷方法であって、耐雷変圧器を構築物内部で絶縁部材を介して設置すると共に、静電遮蔽板と負荷機器とを接地する絶縁電線とは別の絶縁電線で耐雷変圧器の鉄心および筐体とを接地したことを特徴とする。   As technical means for achieving the above-mentioned object, the present invention provides an iron core disposed between an input winding and an output winding, and an electrostatic shield disposed between the iron core and at least the output winding. A lightning protection method for an electrical facility in which a lightning transformer with a plate housed in a casing is provided between an input power line and a load device, wherein the lightning protection transformer is installed through an insulating member inside the structure, It is characterized in that the iron core and the casing of the lightning resistant transformer are grounded by an insulated wire different from the insulated wire for grounding the electric shielding plate and the load device.

なお、「鉄心と少なくとも出力巻線との間に配された静電遮蔽板」としたのは、耐雷変圧器の構成において、鉄心と出力巻線との間に配された静電遮蔽板のみならず、鉄心と入力巻線との間に配された静電遮蔽板も含むことを意味する。   The “electrostatic shielding plate arranged between the iron core and at least the output winding” is only the electrostatic shielding plate arranged between the iron core and the output winding in the lightning-proof transformer configuration. It also means that an electrostatic shielding plate arranged between the iron core and the input winding is included.

本発明では、耐雷変圧器の絶縁強度を超える雷サージにより耐雷変圧器が破壊した場合、耐雷変圧器の入力電源端子から耐雷変圧器の筐体に放電したとしても、耐雷変圧器を構築物内部で絶縁部材を介して設置したことにより、その絶縁部材で雷電流が構築物の鉄筋などを通って負荷機器に流れることを阻止することができる。   In the present invention, when a lightning surge transformer is destroyed by a lightning surge exceeding the insulation strength of the lightning resistant transformer, the lightning resistant transformer is installed inside the structure even if it is discharged from the input power terminal of the lightning resistant transformer to the lightning resistant transformer casing. By installing through the insulating member, it is possible to prevent the lightning current from flowing to the load equipment through the reinforcing bar of the structure.

また、静電遮蔽板と負荷機器を接地する絶縁電線とは別の絶縁電線で耐雷変圧器の鉄心および筐体を接地したことにより、筐体に放電した雷電流を耐雷変圧器の鉄心および筐体を接地した絶縁電線に流し、その雷電流が静電遮蔽板と負荷機器を接地する絶縁電線に流れることを抑制する。   In addition, by grounding the iron core and housing of the lightning-resistant transformer with an insulated wire that is separate from the insulated wire that grounds the electrostatic shielding plate and the load device, the lightning current discharged to the housing is reduced to the iron core and housing of the lightning-resistant transformer. It flows to the insulated wire that grounds the body, and the lightning current is prevented from flowing to the insulated wire that grounds the electrostatic shielding plate and the load device.

前述の構成において、静電遮蔽板と負荷機器を接地する絶縁電線とは別の絶縁電線で耐雷変圧器の鉄心および筐体を接地する場合、静電遮蔽板を負荷機器の主接地に接続すると共に、鉄心および筐体の接地極を負荷機器の接地極とは独立して設ける方法、あるいは、静電遮蔽板を負荷機器の主接地に接続すると共に、鉄心および筐体を負荷機器の主接地にその接地極付近で接続する方法のいずれかを選択すればよい。   In the above configuration, when grounding the iron core and housing of the lightning-resistant transformer with an insulated wire different from the insulated wire that grounds the electrostatic shielding plate and the load device, connect the electrostatic shielding plate to the main ground of the load device. In addition, a method of providing the core and the grounding pole of the housing independently of the grounding pole of the load device, or connecting the electrostatic shielding plate to the main ground of the load device and connecting the iron core and the housing to the main ground of the load device. Any one of the methods of connecting near the ground electrode may be selected.

鉄心および筐体の接地極を負荷機器の接地極とは独立して設ける場合には、既設された負荷機器の接地極とは別に鉄心および筐体の接地極を新たに設ける必要があるが、静電遮蔽板を負荷機器の主接地に接続すると共に、鉄心および筐体を負荷機器の主接地にその接地極付近で接続すれば、既設された負荷機器の接地極を利用することができ、新たな接地極を設ける必要はない。   When the iron core and the grounding electrode of the housing are provided independently from the grounding electrode of the load device, it is necessary to newly provide the iron core and the grounding electrode of the housing separately from the grounding electrode of the existing load device. If the electrostatic shielding plate is connected to the main ground of the load device, and the iron core and the housing are connected to the main ground of the load device near the ground electrode, the ground electrode of the existing load device can be used. There is no need to provide a new ground electrode.

また、前述の構成において、鉄心および筐体を接地する絶縁電線を管路内で配線することが望ましい。このようにすれば、新設された負荷機器に対してその負荷機器の接地を、鉄心および筐体を接地する絶縁電線に誤って接続することを未然に防止できる。   In the above-described configuration, it is desirable to wire an insulated wire for grounding the iron core and the housing in the pipe. In this way, it is possible to prevent the newly installed load device from being erroneously connected to the insulated wire that grounds the iron core and the housing.

さらに、前述の構成において、耐雷変圧器の入力側で入力電源線に介挿された低圧受電設備の筐体を大地に対して絶縁させることが望ましい。このようにすれば、低圧受電設備での放電を防止することができ、雷電流が耐雷変圧器および負荷機器に流れることを阻止できる。   Furthermore, in the above-described configuration, it is desirable to insulate the housing of the low-voltage power receiving equipment inserted in the input power line on the input side of the lightning-resistant transformer from the ground. If it does in this way, the discharge in a low voltage | pressure power receiving equipment can be prevented, and it can prevent that a lightning current flows into a lightning-resistant transformer and load equipment.

本発明によれば、耐雷変圧器の絶縁強度を超える雷サージにより耐雷変圧器が破壊した場合、耐雷変圧器の入力電源端子から耐雷変圧器の筐体に放電したとしても、耐雷変圧器を構築物内部で絶縁部材を介して設置したことにより、その絶縁部材で雷電流が構築物の鉄筋などを通って負荷機器に流れることを阻止することができる。   According to the present invention, if a lightning surge is destroyed by a lightning surge exceeding the insulation strength of the lightning resistant transformer, the lightning resistant transformer is constructed even if it is discharged from the input power terminal of the lightning resistant transformer to the housing of the lightning resistant transformer. By installing through an insulating member inside, it is possible to prevent the lightning current from flowing through the reinforcing bar of the structure and the like to the load device.

また、静電遮蔽板と負荷機器を接地する絶縁電線とは別の絶縁電線で耐雷変圧器の鉄心および筐体を接地したことにより、筐体に放電した雷電流を耐雷変圧器の鉄心および筐体を接地した絶縁電線に流し、その雷電流が静電遮蔽板と負荷機器を接地する絶縁電線に流れることを抑制する。   In addition, by grounding the iron core and housing of the lightning-resistant transformer with an insulated wire that is separate from the insulated wire that grounds the electrostatic shielding plate and the load device, the lightning current discharged to the housing is reduced to the iron core and housing of the lightning-resistant transformer. It flows to the insulated wire that grounds the body, and the lightning current is prevented from flowing to the insulated wire that grounds the electrostatic shielding plate and the load device.

その結果、耐雷変圧器の絶縁強度を超える雷サージにより耐雷変圧器が破壊した場合でも、雷電流による負荷機器への波及を抑制することができ、耐雷変圧器の絶縁強度を超える雷サージに対して負荷機器を確実に保護することができてその実用的価値は大きい。   As a result, even if a lightning surge breaks due to a lightning surge exceeding the insulation strength of the lightning-resistant transformer, it is possible to suppress the spread of lightning current to the load equipment, and against lightning surges exceeding the insulation strength of the lightning-resistant transformer. Therefore, it is possible to reliably protect the load device, and its practical value is great.

本発明に係る電気施設の耐雷方法の各実施形態を図１〜図５に示して説明する。以下の各実施形態では、例えば、無線中継所や高度情報化ビル、ハイテク工場などを含む全ての電気施設において、半導体システム等の負荷機器２３を雷サージから保護するため、構築物２１内で入力電源線２２と負荷機器２３との間に耐雷変圧器２４を設置した耐雷対策例を詳述する。   Each embodiment of the lightning protection method for an electrical facility according to the present invention will be described with reference to FIGS. In each of the following embodiments, for example, in all electrical facilities including a wireless relay station, an advanced information-oriented building, a high-tech factory, and the like, an input power source within the structure 21 is used to protect the load device 23 such as a semiconductor system from lightning surges. An example of lightning protection measures in which a lightning transformer 24 is installed between the wire 22 and the load device 23 will be described in detail.

図１〜図５に示す各実施形態は、電気施設としての構築物２１の内部に半導体システム等の複数の負荷機器２３が設置され、構築物２１の外部の柱上変圧器（図示せず）からの低圧電力を各負荷機器２３に供給する入力電源線２２とそれら負荷機器２３との間に耐雷変圧器２４を設置した構成を具備する。   In each embodiment shown in FIGS. 1 to 5, a plurality of load devices 23 such as a semiconductor system are installed inside a structure 21 as an electric facility, and a pole transformer (not shown) outside the structure 21 is installed. A configuration in which a lightning-resistant transformer 24 is installed between the input power line 22 for supplying low-voltage power to each load device 23 and the load devices 23 is provided.

この耐雷変圧器２４は、入力巻線２５（一次巻線）と、出力巻線２６（二次巻線）と、それら入力巻線２５と出力巻線２６間に介在した鉄心２７とで主要部が構成され、鉄心２７と出力巻線２６との間に静電遮蔽板２８（シールド板）が配置されている。なお、耐雷変圧器２４としては、鉄心２７と出力巻線２６との間に配された静電遮蔽板２８のみならず、鉄心２７と入力巻線２５との間に配された静電遮蔽板３８を有する構成についても適用可能である。   The lightning transformer 24 includes an input winding 25 (primary winding), an output winding 26 (secondary winding), and an iron core 27 interposed between the input winding 25 and the output winding 26. The electrostatic shielding plate 28 (shield plate) is disposed between the iron core 27 and the output winding 26. The lightning resistant transformer 24 includes not only the electrostatic shielding plate 28 disposed between the iron core 27 and the output winding 26 but also the electrostatic shielding plate disposed between the iron core 27 and the input winding 25. The configuration having 38 is also applicable.

また、入力巻線２５の入力側電源端子２９間、および出力巻線２６の出力側電源端子３０間には線間避雷器３１，３２が設けられている。前述した入力巻線２５、出力巻線２６、鉄心２７、静電遮蔽板２８および線間避雷器３１，３２からなる内部構成部品は金属製筐体３４に格納されている。   Further, line lightning arresters 31 and 32 are provided between the input side power supply terminals 29 of the input winding 25 and between the output side power supply terminals 30 of the output winding 26. Internal components including the input winding 25, the output winding 26, the iron core 27, the electrostatic shielding plate 28, and the line lightning arresters 31 and 32 are stored in a metal casing 34.

さらに、図中の符号３５，３６は、低圧受電設備である受電箱と開閉器盤であり、受電箱３５は構築物２１の外部で入力電源線２２に介挿され、開閉器盤３６は構築物２１の内部で入力電源線２２に介挿されている。   Further, reference numerals 35 and 36 in the figure denote a power receiving box and a switch board which are low-voltage power receiving equipment. The power receiving box 35 is inserted into the input power line 22 outside the structure 21, and the switch board 36 is connected to the structure 21. Is inserted into the input power supply line 22.

図１〜図５の各実施形態では、耐雷変圧器２４を構築物２１の内部で絶縁部材４１を介して設置している。従来の耐雷変圧器４の場合（図６参照）、構築物１の内部で金属製筐体１４を床１７に直置きしていたのに対して、本発明の実施形態における耐雷変圧器２４の場合、構築物２１の床３７に絶縁部材４１を配設し、その絶縁部材４１の上に耐雷変圧器２４の金属製筐体３４を載置する。   In each embodiment of FIGS. 1 to 5, the lightning resistant transformer 24 is installed inside the structure 21 via an insulating member 41. In the case of the conventional lightning resistant transformer 4 (see FIG. 6), the metal casing 14 is placed directly on the floor 17 in the structure 1, whereas in the case of the lightning resistant transformer 24 in the embodiment of the present invention. The insulating member 41 is disposed on the floor 37 of the structure 21, and the metal casing 34 of the lightning resistant transformer 24 is placed on the insulating member 41.

この絶縁部材４１としては、木材の他、ゴム素材、ポリアセタール（ＰＯＭ）やフッ素樹脂（ＰＴＦＥ）に代表される絶縁性高分子材料などを使用することが可能である。なお、図では、耐雷変圧器２４の金属製筐体３４の隅部に絶縁部材４１を介在させた場合を例示しているが、これに限らず、その金属製筐体３４の底面全面に絶縁部材を介在させるようにしてもよい。   As the insulating member 41, it is possible to use a rubber material, an insulating polymer material typified by polyacetal (POM) or fluororesin (PTFE), in addition to wood. In addition, although the figure illustrates the case where the insulating member 41 is interposed in the corner of the metal casing 34 of the lightning resistant transformer 24, the present invention is not limited to this, and the entire bottom surface of the metal casing 34 is insulated. A member may be interposed.

この絶縁部材４１による耐雷変圧器２４の耐雷対策では、耐雷変圧器２４の絶縁強度を超える雷サージにより耐雷変圧器２４が破壊した場合、耐雷変圧器２４の入力電源端子２９から耐雷変圧器２４の筐体３４に放電したとしても、耐雷変圧器２４を構築物２１の内部で絶縁部材４１を介して設置したことにより、耐雷変圧器２４が構築物２１の床３７からフローティングされていることから、絶縁部材４１で雷電流が構築物２１の鉄筋（図示せず）などを通って負荷機器２３に流れることを阻止することができる。   In the lightning protection measures for the lightning resistant transformer 24 by the insulating member 41, when the lightning resistant transformer 24 is destroyed by a lightning surge exceeding the insulation strength of the lightning resistant transformer 24, the lightning resistant transformer 24 is connected to the lightning resistant transformer 24 from the input power supply terminal 29 of the lightning resistant transformer 24. Even if the casing 34 is discharged, the lightning resistant transformer 24 is floated from the floor 37 of the structure 21 by installing the lightning resistant transformer 24 through the insulating member 41 inside the structure 21. 41, it is possible to prevent the lightning current from flowing to the load device 23 through the reinforcing bars (not shown) of the structure 21 or the like.

また、図１〜図５の各実施形態では、耐雷変圧器２４の出力巻線２６側の静電遮蔽板２８と負荷機器２３とを接地する絶縁電線４４とは別の絶縁電線４２で耐雷変圧器２４の鉄心２７および筐体３４とを接地している。ここで、前述の絶縁電線４２，４４としては、ビニル絶縁電線の他、ポリエチレン絶縁電線、架橋ポリエチレン絶縁ビニルシース電力ケーブル等、絶縁被覆を有する非導電性の電線が使用可能であり、裸線を非導電性電線管内に配線したものも含む。図１〜図５の各実施形態では、以下のような各種の接地構造としている。   In each embodiment of FIGS. 1 to 5, a lightning-resistant transformer is provided by an insulated wire 42 that is different from the insulated wire 44 that grounds the electrostatic shielding plate 28 on the output winding 26 side of the lightning-resistant transformer 24 and the load device 23. The iron core 27 and the casing 34 of the container 24 are grounded. Here, as the above-described insulated wires 42 and 44, non-conductive wires having an insulation coating such as polyethylene insulated wires and cross-linked polyethylene insulated vinyl sheath power cables can be used in addition to vinyl insulated wires. Includes wiring in a conductive conduit. In each embodiment of FIGS. 1 to 5, the following various grounding structures are employed.

図１に示す第一の実施形態では、耐雷変圧器２４の出力巻線２６側の静電遮蔽板２８を負荷機器２３の主接地３３に接続する。なお、この静電遮蔽板２８は、耐雷変圧器２４の金属製筐体３４とは電気的に接続されていない。一方、この負荷機器２３の主接地３３とは別に、耐雷変圧器２４の鉄心２７を筐体接地４６に接続するようにしている。耐雷変圧器２４の静電遮蔽板２８と負荷機器２３の主接地３３における絶縁電線４４は、構築物２１の近傍で接地極４５に接続され、耐雷変圧器２４の鉄心２７および筐体３４の接地における絶縁電線４２は、構築物２１の近傍で接地極４３に接続される。   In the first embodiment shown in FIG. 1, the electrostatic shielding plate 28 on the output winding 26 side of the lightning proof transformer 24 is connected to the main ground 33 of the load device 23. The electrostatic shielding plate 28 is not electrically connected to the metal casing 34 of the lightning proof transformer 24. On the other hand, separately from the main ground 33 of the load device 23, the iron core 27 of the lightning resistant transformer 24 is connected to the housing ground 46. The insulated wire 44 in the electrostatic grounding plate 28 of the lightning-resistant transformer 24 and the main ground 33 of the load device 23 is connected to the ground electrode 45 in the vicinity of the structure 21, and in the grounding of the iron core 27 and the housing 34 of the lightning-resistant transformer 24. The insulated wire 42 is connected to the ground electrode 43 in the vicinity of the structure 21.

この時、負荷機器２３の主接地３３における接地極４５と鉄心２７および筐体３４の接地における接地極４３とは、例えば１８０°反対方向に離隔して打設することが好ましい。また、接地極４３，４５は、外部からの雷電流の影響を抑制するために構築物２１の近傍に設けられているが、特に、接地極４５については、外部からの雷電流の影響をより確実に抑制するため、理想的には構築物２１の内部に設けることが望ましい。これは、図３および図４に示す実施形態についても同様である。   At this time, it is preferable that the grounding electrode 45 in the main ground 33 of the load device 23 and the grounding electrode 43 in the grounding of the iron core 27 and the housing 34 are spaced apart in the opposite direction, for example, 180 °. The grounding electrodes 43 and 45 are provided in the vicinity of the structure 21 in order to suppress the influence of the lightning current from the outside. In particular, the grounding electrode 45 is more reliably affected by the lightning current from the outside. In order to suppress it, it is ideally provided inside the structure 21. The same applies to the embodiments shown in FIGS. 3 and 4.

この実施形態のように、負荷機器２３の主接地３３とは別に、耐雷変圧器２４の鉄心２７を筐体接地４６に接続するようにしたことにより、耐雷変圧器２４の絶縁強度を超える雷サージにより耐雷変圧器２４が破壊した場合、耐雷変圧器２４の入力電源端子２９から耐雷変圧器２４の筐体３４に放電したとしても、筐体３４に放電した雷電流を耐雷変圧器２４の鉄心２７および筐体３４を接地した絶縁電線４２に流し、その雷電流が静電遮蔽板２８と負荷機器２３を接地する絶縁電線４４に流れることを抑制でき、負荷機器２３の保護が図れる。   As in this embodiment, separately from the main ground 33 of the load device 23, the lightning surge exceeding the insulation strength of the lightning resistant transformer 24 is achieved by connecting the iron core 27 of the lightning resistant transformer 24 to the housing ground 46. When the lightning-resistant transformer 24 is destroyed by the above, even if the lightning-resistant transformer 24 is discharged from the input power terminal 29 of the lightning-resistant transformer 24 to the housing 34 of the lightning-resistant transformer 24, the lightning current discharged to the housing 34 is converted into the iron core 27 of the lightning-resistant transformer 24. In addition, it is possible to prevent the lightning current from flowing to the insulated wire 42 that grounds the electrostatic shielding plate 28 and the load device 23, and to protect the load device 23.

なお、この実施形態では、鉄心２７および筐体３４の接地極４３を負荷機器２３の接地極４５とは独立して設けている。つまり、耐雷変圧器２４の耐雷対策をとるに際して、構築物２１が既存のもので負荷機器２３の主接地３３が既に設けられている場合、既設された負荷機器２３の接地極３３とは別に鉄心２７および筐体３４の接地極４３を新たに設けることになる。この鉄心２７および筐体３４の接地極４３を新設することが容易な場合には、前述した図１の実施形態が好適であるが、鉄心２７および筐体３４の接地極４３を新設することが困難な場合には、図２に示す第二の実施形態が望ましい。   In this embodiment, the iron core 27 and the ground electrode 43 of the housing 34 are provided independently of the ground electrode 45 of the load device 23. That is, when taking the lightning protection measures of the lightning-resistant transformer 24, if the structure 21 is existing and the main ground 33 of the load device 23 is already provided, the iron core 27 is separate from the ground electrode 33 of the existing load device 23. In addition, a ground electrode 43 of the housing 34 is newly provided. In the case where it is easy to newly install the iron core 27 and the grounding electrode 43 of the housing 34, the above-described embodiment of FIG. 1 is suitable. However, it is possible to newly install the ironing core 27 and the grounding electrode 43 of the housing 34. If this is difficult, the second embodiment shown in FIG. 2 is desirable.

図２に示す第二の実施形態では、耐雷変圧器２４の出力巻線２６側の静電遮蔽板２８を負荷機器２３の主接地３３に接続する。なお、この静電遮蔽板２８は、耐雷変圧器２４の金属製筐体３４とは電気的に接続されていない。一方、耐雷変圧器２４の鉄心２７を筐体３４に接続し、その筐体接地４７を負荷機器２３の主接地３３にその接地極４５付近で接続する。耐雷変圧器２４の静電遮蔽板２８と負荷機器２３の主接地３３における絶縁電線４４は、構築物２１の近傍で接地極４５に接続され、耐雷変圧器２４の鉄心２７および筐体３４の接地における絶縁電線４２は、負荷機器２３の主接地３３の接地極４５付近でその絶縁電線４４に接続される。   In the second embodiment shown in FIG. 2, the electrostatic shielding plate 28 on the output winding 26 side of the lightning proof transformer 24 is connected to the main ground 33 of the load device 23. The electrostatic shielding plate 28 is not electrically connected to the metal casing 34 of the lightning proof transformer 24. On the other hand, the iron core 27 of the lightning resistant transformer 24 is connected to the housing 34, and the housing ground 47 is connected to the main ground 33 of the load device 23 in the vicinity of the ground electrode 45. The insulated wire 44 in the electrostatic shielding plate 28 of the lightning-resistant transformer 24 and the main ground 33 of the load device 23 is connected to the ground electrode 45 in the vicinity of the structure 21, and in the grounding of the iron core 27 and the housing 34 of the lightning-resistant transformer 24. The insulated wire 42 is connected to the insulated wire 44 near the ground electrode 45 of the main ground 33 of the load device 23.

このようにすれば、前述したように耐雷変圧器２４の耐雷対策をとるに際して、構築物２１が既存のもので負荷機器２３の主接地３３が既に設けられている場合、既設された負荷機器２３の接地極３３を利用することができ、新たな接地極を設ける必要はない。なお、既設の接地極４５は、外部からの雷電流の影響を抑制するために構築物２１の近傍に設けられているが、外部からの雷電流の影響をより確実に抑制するため、理想的には構築物２１の内部に設けることが望ましい。これは、図５に示す実施形態についても同様である。   In this way, when the lightning protection measures of the lightning resistant transformer 24 are taken as described above, if the structure 21 is an existing structure and the main ground 33 of the load equipment 23 is already provided, the existing load equipment 23 The ground electrode 33 can be used, and there is no need to provide a new ground electrode. The existing ground electrode 45 is provided in the vicinity of the structure 21 in order to suppress the influence of the lightning current from the outside, but ideally in order to suppress the influence of the lightning current from the outside more reliably. Is preferably provided inside the structure 21. The same applies to the embodiment shown in FIG.

この実施形態の場合も、負荷機器２３の主接地３３とは別に、耐雷変圧器２４の鉄心２７を筐体３４に接続し、その筐体接地４７を負荷機器２３の主接地３３にその接地極４５付近で接続したことにより、耐雷変圧器２４の絶縁強度を超える雷サージにより耐雷変圧器２４が破壊した場合、耐雷変圧器２４の入力電源端子２９から耐雷変圧器２４の筐体３４に放電したとしても、筐体３４に放電した雷電流を耐雷変圧器２４の鉄心２７および筐体３４を接地した絶縁電線４２に流し、その雷電流が静電遮蔽板２８と負荷機器２３を接地する絶縁電線４４に流れることを抑制でき、負荷機器２３の保護が図れる。   Also in this embodiment, apart from the main ground 33 of the load device 23, the iron core 27 of the lightning-resistant transformer 24 is connected to the housing 34, and the housing ground 47 is connected to the main ground 33 of the load device 23. When the lightning surge transformer 24 is destroyed due to a lightning surge exceeding the insulation strength of the lightning resistant transformer 24 due to the connection near 45, the lightning surge is discharged from the input power terminal 29 of the lightning resistant transformer 24 to the housing 34 of the lightning resistant transformer 24. However, the lightning current discharged to the casing 34 is caused to flow through the iron core 27 of the lightning-resistant transformer 24 and the insulated wire 42 grounded to the casing 34, and the lightning current grounds the electrostatic shielding plate 28 and the load device 23. Therefore, the load device 23 can be protected.

図３に示す第三の実施形態は、出力巻線２６側のみならず、入力巻線２５側にも静電遮蔽板３８（シールド板）を有する耐雷変圧器２４の場合を例示する。このような耐雷変圧器２４が設置されている場合、耐雷対策の一つとして、入力巻線２５側の静電遮蔽板３８を入力電源線２２のゼロ電位線に接続することも有効である。これにより、耐雷変圧器２４の入力側と出力側の電位が分離され、その耐雷変圧器２４の入力側からの雷電流が、その出力側に接続された負荷機器２３に流れるルートを遮断することができる。   The third embodiment shown in FIG. 3 illustrates the case of the lightning resistant transformer 24 having the electrostatic shielding plate 38 (shield plate) not only on the output winding 26 side but also on the input winding 25 side. When such a lightning resistant transformer 24 is installed, it is also effective to connect the electrostatic shielding plate 38 on the input winding 25 side to the zero potential line of the input power supply line 22 as one countermeasure against lightning. As a result, the potential on the input side and the output side of the lightning-resistant transformer 24 is separated, and the lightning current from the input side of the lightning-resistant transformer 24 blocks the route that flows to the load device 23 connected to the output side. Can do.

なお、この実施形態は、図１に示す第一の実施形態における耐雷対策に、入力巻線２５側の静電遮蔽板３８を入力電源線２２のゼロ電位線に接続する耐雷対策を付加したものであるが、図２に示す第二の実施形態の耐雷対策にも付加することができる。なお、図１の第一の実施形態および図２の第二の実施形態における耐雷対策についての構成および作用効果は、図３の第三の実施形態でも同様であるため、その重複説明は省略する。   In this embodiment, a lightning protection measure for connecting the electrostatic shielding plate 38 on the input winding 25 side to the zero potential line of the input power supply line 22 is added to the lightning protection measure in the first embodiment shown in FIG. However, it can be added to the lightning protection measures of the second embodiment shown in FIG. The configuration and operational effects of the lightning protection measures in the first embodiment in FIG. 1 and the second embodiment in FIG. 2 are the same in the third embodiment in FIG. .

また、図４および図５は本発明の第四および第五の実施形態で、図４に示す第四の実施形態は図１の第一の実施形態に適用した例であり、図５に示す第五の実施形態は図２の第二の実施形態に適用した例である。   4 and 5 show the fourth and fifth embodiments of the present invention, and the fourth embodiment shown in FIG. 4 is an example applied to the first embodiment of FIG. 1, and is shown in FIG. The fifth embodiment is an example applied to the second embodiment of FIG.

これら図４および図５の第四および第五の実施形態では、耐雷変圧器２４の鉄心２７および筐体３４を接地する絶縁電線４２を管路４８，４９内で配線する。この耐雷変圧器２４の鉄心２７および筐体３４を接地する絶縁電線４２が挿通された管路４８，４９としては、絶縁電線４２を保護する目的から、例えば合成樹脂製の可撓電線管の他、ビニル電線管などを使用することが可能である。可撓性を有する管路４８，４９とすれば、絶縁電線４２の引き回しが容易となる。   In the fourth and fifth embodiments of FIGS. 4 and 5, an insulated wire 42 that grounds the iron core 27 and the housing 34 of the lightning-resistant transformer 24 is wired in the conduits 48 and 49. For the purpose of protecting the insulated wires 42, the conduits 48 and 49 through which the insulated wires 42 for grounding the iron core 27 and the casing 34 of the lightning-resistant transformer 24 are inserted are, for example, flexible resin tubes made of synthetic resin. It is possible to use a vinyl conduit. If the conduits 48 and 49 have flexibility, the insulated wire 42 can be easily routed.

このように、耐雷変圧器２４の鉄心２７および筐体３４を接地する絶縁電線４２を管路４８，４９内で配線すれば、構築物２１内で負荷機器２３を新設するに際してその負荷機器２３の接地を行う作業において、鉄心２７および筐体３４を接地する絶縁電線４２に、新設の負荷機器２３の接地線を誤って接続することを未然に防止でき、作業上での安全性を確保することができる。   In this way, if the insulated wire 42 that grounds the iron core 27 and the casing 34 of the lightning-resistant transformer 24 is wired in the pipes 48 and 49, when the load device 23 is newly installed in the structure 21, the load device 23 is grounded. In the work to perform, it is possible to prevent the ground wire of the newly installed load device 23 from being erroneously connected to the insulated wire 42 that grounds the iron core 27 and the housing 34, and to ensure safety in the work. it can.

さらに、図１〜図５に示す各実施形態において、耐雷変圧器２４の入力電源線２２には、構築物２１の外部に低圧受電設備としての受電箱３５が介挿され、構築物２１の内部に低圧受電設備としての開閉器盤３６が介挿されている。従来の耐雷対策においては（図６参照）、これら受電箱１５および開閉器盤１６を筐体接地（Ｄ種接地）させているのに対して、各実施形態では、これら受電箱３５および開閉器盤３６の筐体を大地に対して絶縁させている。つまり、受電箱３５および開閉器盤３６の筐体を絶縁性材料で構成する。その絶縁性材料としては、ＦＲＰの他、ＡＢＳ樹脂やポリカーボネート樹脂などが好適である。   Furthermore, in each embodiment shown in FIG. 1 to FIG. 5, a power receiving box 35 as a low-voltage power receiving facility is inserted outside the structure 21 in the input power line 22 of the lightning proof transformer 24, and a low voltage inside the structure 21. A switch board 36 as power receiving equipment is inserted. In the conventional lightning protection measures (see FIG. 6), the power receiving box 15 and the switch board 16 are grounded to the casing (D-type grounding), whereas in each embodiment, the power receiving box 35 and the switch are grounded. The casing of the board 36 is insulated from the ground. That is, the housings of the power receiving box 35 and the switch board 36 are made of an insulating material. As the insulating material, in addition to FRP, ABS resin, polycarbonate resin, and the like are suitable.

このように、低圧受電設備である受電箱３５および開閉器盤３６の筐体を大地に対して絶縁させるようにすれば、受電箱３５あるいは開閉器盤３６での放電を防止することができ、雷電流が耐雷変圧器２４および負荷機器２３に流れることを阻止できる。   In this way, if the housing of the power receiving box 35 and the switch board 36 that are low-voltage power receiving equipment is insulated from the ground, it is possible to prevent discharge in the power receiving box 35 or the switch board 36, Lightning current can be prevented from flowing to the lightning-resistant transformer 24 and the load device 23.

つまり、従来のように受電箱１５あるいは開閉器盤１６を筐体接地した場合であると（図６参照）、雷サージにより受電箱１５あるいは開閉器盤１６に非常に大きな過電圧が加わると、その内部部品から筐体へ放電し、この放電により入力電源線２に雷電流が流れる。また、受電箱１５あるいは開閉器盤１６の筐体への放電ばかりでなく、その筐体接地から入力電源線２への放電によっても入力電源線２に雷電流が流れることになる。この雷電流により耐雷変圧器４が破壊すれば、雷電流が負荷機器３に流入して被害を及ぼすことになる。   That is, when the power receiving box 15 or the switch board 16 is grounded as in the conventional case (see FIG. 6), when a very large overvoltage is applied to the power receiving box 15 or the switch board 16 due to a lightning surge, The internal components are discharged to the housing, and this discharge causes a lightning current to flow through the input power line 2. Further, not only the discharge to the casing of the power receiving box 15 or the switch board 16 but also the discharge from the casing ground to the input power line 2 causes a lightning current to flow through the input power line 2. If the lightning resistant transformer 4 is destroyed by this lightning current, the lightning current flows into the load device 3 and causes damage.

そこで、図１〜図５の実施形態のように、受電箱３５および開閉器盤３６の筐体を大地に対して絶縁させることにより、受電箱３５あるいは開閉器盤３６での放電を防止することができ、入力電源線２２に過大な雷電流が流れることもなくなるので、その雷電流が耐雷変圧器２４および負荷機器２３に流入することを阻止できる。   Therefore, as in the embodiment of FIGS. 1 to 5, by preventing the housing of the power receiving box 35 and the switch board 36 from the ground, discharge in the power receiving box 35 or the switch board 36 is prevented. Since an excessive lightning current does not flow through the input power line 22, the lightning current can be prevented from flowing into the lightning-resistant transformer 24 and the load device 23.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the scope of the present invention. The scope of the present invention is not limited to patents. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

本発明に係る電気施設の耐雷方法の第一の実施形態を示す概略構成図である。It is a schematic block diagram which shows 1st embodiment of the lightning protection method of the electrical facility which concerns on this invention. 本発明の第二の実施形態を示す概略構成図である。It is a schematic block diagram which shows 2nd embodiment of this invention. 本発明の第三の実施形態を示す概略構成図である。It is a schematic block diagram which shows 3rd embodiment of this invention. 本発明の第四の実施形態を示す概略構成図である。It is a schematic block diagram which shows 4th embodiment of this invention. 本発明の第五の実施形態を示す概略構成図である。It is a schematic block diagram which shows 5th embodiment of this invention. 電気施設の耐雷方法の従来例を示す概略構成図である。It is a schematic block diagram which shows the prior art example of the lightning protection method of an electric facility.

符号の説明Explanation of symbols

２１ 構築物
２２ 入力電源線
２３ 負荷機器
２４ 耐雷変圧器
２５ 入力巻線
２６ 出力巻線
２７ 鉄心
２８ 静電遮蔽板
３３ 主接地
３４ 筐体
３５ 受電箱（低圧受電設備）
３６ 開閉器盤（低圧受電設備）
４１ 絶縁部材
４２，４４ 絶縁電線
４３，４５ 接地極
４８，４９ 管路 21 Structure 22 Input Power Line 23 Load Equipment 24 Lightning-Resistant Transformer 25 Input Winding 26 Output Winding 27 Iron Core 28 Electrostatic Shielding Plate 33 Main Ground 34 Case 35 Power Receiving Box (Low Voltage Power Receiving Equipment)
36 Switchboard (low-voltage power receiving equipment)
41 Insulating member 42, 44 Insulated wire 43, 45 Ground electrode 48, 49 Pipe line

Claims (5)

入力巻線と出力巻線との間に配された鉄心およびその鉄心と少なくとも出力巻線との間に配された静電遮蔽板が筐体に格納された耐雷変圧器を入力電源線と負荷機器との間に設けた電気施設の耐雷方法であって、前記耐雷変圧器を構築物内部で絶縁部材を介して設置すると共に、前記静電遮蔽板と負荷機器を接地する絶縁電線とは別の絶縁電線で耐雷変圧器の鉄心および筐体を接地したことを特徴とする電気施設の耐雷方法。   A lightning-resistant transformer in which an iron core placed between the input winding and the output winding and an electrostatic shielding plate placed between the iron core and at least the output winding are housed in the housing are connected to the input power line and the load. A lightning protection method for an electrical facility provided between devices, wherein the lightning protection transformer is installed through an insulating member inside the structure, and is different from an insulated wire for grounding the electrostatic shielding plate and a load device. A lightning protection method for an electrical facility, characterized in that the iron core and casing of the lightning protection transformer are grounded with insulated wires. 前記静電遮蔽板を負荷機器の主接地に接続すると共に、鉄心および筐体の接地極を負荷機器の接地極とは独立して設けた請求項１に記載の電気施設の耐雷方法。   2. The lightning protection method for an electrical facility according to claim 1, wherein the electrostatic shielding plate is connected to a main ground of a load device, and an iron core and a ground electrode of a housing are provided independently of a ground electrode of the load device. 前記静電遮蔽板を負荷機器の主接地に接続すると共に、鉄心および筐体を負荷機器の主接地にその接地極付近で接続した請求項１に記載の電気施設の耐雷方法。   The lightning protection method for an electrical facility according to claim 1, wherein the electrostatic shielding plate is connected to the main ground of the load device, and the iron core and the housing are connected to the main ground of the load device near the ground electrode. 前記鉄心および筐体を接地する絶縁電線を管路内で配線した請求項１〜３のいずれか一項に記載の電気施設の耐雷方法。   The lightning protection method for an electrical facility according to any one of claims 1 to 3, wherein an insulated wire for grounding the iron core and the casing is wired in a pipeline. 前記耐雷変圧器の入力側で入力電源線に介挿された低圧受電設備の筐体を大地に対して絶縁させた請求項１〜４のいずれか一項に記載の電気施設の耐雷方法。   The lightning protection method for an electrical facility according to any one of claims 1 to 4, wherein a housing of the low-voltage power receiving equipment inserted in the input power line on the input side of the lightning protection transformer is insulated from the ground.
JP2006317359A 2006-11-24 2006-11-24 Lightning protection method for electric facility Pending JP2008130986A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101142280B1 (en) 2010-11-18 2012-05-07 주식회사 그라운드 Lightning protection apparatus using tn-c type earthing
KR101436512B1 (en) 2014-02-27 2014-09-02 주식회사 그라운드 Surge protection apparatus
JP2017013547A (en) * 2015-06-29 2017-01-19 東日本旅客鉄道株式会社 Ground fault protection device and ground fault protection system
EP3958454A4 (en) * 2019-08-22 2022-12-14 Nr Electric Co., Ltd. Solid-state transformer

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Publication number Priority date Publication date Assignee Title
JPH088122A (en) * 1994-06-17 1996-01-12 Meidensha Corp Transformer provided with vibration suppressing rubber
JP2002315169A (en) * 2001-04-06 2002-10-25 Otowa Denki Kogyo Kk Method for lightning protection for electric equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH088122A (en) * 1994-06-17 1996-01-12 Meidensha Corp Transformer provided with vibration suppressing rubber
JP2002315169A (en) * 2001-04-06 2002-10-25 Otowa Denki Kogyo Kk Method for lightning protection for electric equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101142280B1 (en) 2010-11-18 2012-05-07 주식회사 그라운드 Lightning protection apparatus using tn-c type earthing
WO2012067342A1 (en) * 2010-11-18 2012-05-24 주식회사 그라운드 Lightning protection apparatus using tn-c common ground
KR101436512B1 (en) 2014-02-27 2014-09-02 주식회사 그라운드 Surge protection apparatus
JP2017013547A (en) * 2015-06-29 2017-01-19 東日本旅客鉄道株式会社 Ground fault protection device and ground fault protection system
EP3958454A4 (en) * 2019-08-22 2022-12-14 Nr Electric Co., Ltd. Solid-state transformer

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