JPH0620573A - Safety switch for current transformer - Google Patents
Safety switch for current transformerInfo
- Publication number
- JPH0620573A JPH0620573A JP4194633A JP19463392A JPH0620573A JP H0620573 A JPH0620573 A JP H0620573A JP 4194633 A JP4194633 A JP 4194633A JP 19463392 A JP19463392 A JP 19463392A JP H0620573 A JPH0620573 A JP H0620573A
- Authority
- JP
- Japan
- Prior art keywords
- current transformer
- electrode
- heating wire
- discharge
- fixed electrode
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000013021 overheating Methods 0.000 abstract description 3
- 238000004804 winding Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Breakers (AREA)
- Thermally Actuated Switches (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、定電流給電方式、大
電流測定、各種の計測等に於て使用する電流トランスの
２次側が開放状態になることを防止するための電流トラ
ンス用安全器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current transformer safety device for preventing the secondary side of a current transformer used in a constant current power supply system, large current measurement, various measurements, etc. from being opened. It is about.
【０００２】[0002]
【従来の技術】本出願人は、定電流電源から電流トラン
スを使用して非接触で電力を供給するようにした無結線
放電管照明器具を開発し既に実用新案登録を受けている
（実公昭６４−５３６０号公報参照）。その概要につい
て図２を参照しながら説明すると、定電流電源１１に接
続した一本の給電線１２に電流トランス１３を遊貫させ
その２次巻線１４に放電管１５の両端子を直接接続した
ものであり、放電管１５が放電を開始する前には２次巻
線１４に電流が流れないため電流トランス１３の鉄心が
飽和することにより２次巻線１４に放電管１５の放電開
始電圧より高い電圧が現われ、この電圧により放電を開
始した後は２次巻線１４にその巻数に応じた一定電流が
流れるようになっている。2. Description of the Related Art The applicant of the present invention has developed a connectionless discharge tube lighting device in which a constant current power source is used to supply electric power in a contactless manner using a current transformer, and has already been registered as a utility model. 64-53360). The outline thereof will be described with reference to FIG. 2. A current transformer 13 is allowed to pass through one power supply line 12 connected to a constant current power supply 11, and both terminals of a discharge tube 15 are directly connected to a secondary winding 14 thereof. Since the current does not flow in the secondary winding 14 before the discharge tube 15 starts the discharge, the iron core of the current transformer 13 is saturated, and the secondary winding 14 is discharged from the discharge start voltage of the discharge tube 15 from the discharge start voltage. A high voltage appears, and after the discharge is started by this voltage, a constant current according to the number of turns of the secondary winding 14 flows.
【０００３】ところが、もし何らかの原因で放電管１５
が切れた場合、電流トランス１３の２次巻線１４に放電
管１５の放電電圧よりはるかに高い電圧が現れるから、
放電管を取り替える際に誤って２次巻線１４に触れると
感電するおそれがあり、また、磁束が増えて鉄損が著し
く増加するためトランスが過熱しそのまま放置すると危
険であるという欠点があった。However, if for some reason the discharge tube 15
When the current is cut off, a voltage much higher than the discharge voltage of the discharge tube 15 appears in the secondary winding 14 of the current transformer 13,
If the secondary winding 14 is accidentally touched when replacing the discharge tube, there is a risk of electric shock, and there is a drawback that the transformer is overheated and it is dangerous to leave it as it is because the magnetic flux increases and the iron loss remarkably increases. .
【０００４】[0004]
【発明が解決しようとする課題】この発明の目的は、電
流トランスの負荷が開放状態になったとき、電流トラン
スの２次巻線を自動的に短絡して感電や過熱の危険を防
止するための電流トランス用安全器を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to prevent the risk of electric shock or overheating by automatically short-circuiting the secondary winding of the current transformer when the load of the current transformer is opened. Is to provide a safety device for a current transformer.
【０００５】[0005]
【課題を解決するための手段】上記の目的を解決するた
め、この発明の電流トランス用安全器は、電熱線を巻回
したバイメタルからなる可動電極と固定電極とを密閉容
器中に微小間隔を置いて対向配置し、電熱線の一端を可
動電極に接続するとともに電熱線の他端と固定電極とを
２つの電極端子にそれぞれ接続している。In order to solve the above-mentioned object, a safety device for a current transformer according to the present invention has a movable electrode made of bimetal wound with a heating wire and a fixed electrode in a hermetically sealed container with a minute interval. One end of the heating wire is connected to the movable electrode and the other end of the heating wire and the fixed electrode are connected to two electrode terminals, respectively.
【０００６】[0006]
【作用】この電流トランス用安全器を電流トランスの負
荷に並列に接続しておくと、何らかの原因で電流トラン
スの負荷が開放状態になったとき、電流トランスの２次
巻線に高電圧が現れ可動電極と固定電極との間で放電が
始まり、放電の熱により可動電極のバイメタルが変形し
て可動電極と固定電極とが短絡し、放電が停止しても今
度は電熱線が発熱することによりバイメタルが変形した
状態を保ち、可動電極と固定電極とは短絡したままとな
るから、電流トランスの出力側は短絡した状態に保たれ
る。If the current transformer cutout is connected in parallel with the load of the current transformer, when the load of the current transformer is opened for some reason, a high voltage appears in the secondary winding of the current transformer. Discharge starts between the movable electrode and the fixed electrode, the bimetal of the movable electrode is deformed by the heat of the discharge and the movable electrode and the fixed electrode are short-circuited, and even if the discharge is stopped, the heating wire generates heat. Since the bimetal remains deformed and the movable electrode and the fixed electrode remain short-circuited, the output side of the current transformer is kept short-circuited.
【０００７】[0007]
【実施例】この発明の実施例である電流トランス用安全
器について図１を参照しながら説明する。内部を１０To
rr以下に減圧した密閉容器１の中に、棒状の固定電極２
と可動電極３とがわずかな間隔を置いて対向配置されて
いる。可動電極３は逆Ｕ字状をしたバイメタルを支持棒
に固定したものであり、固定電極２と可動電極３との間
に所定電圧がかかったとき真空放電が発生し、放電の熱
によりわずかな時間でバイメタルが変形し可動電極３が
固定電極２に接触するようになっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS A safety device for a current transformer which is an embodiment of the present invention will be described with reference to FIG. Inside 10To
The rod-shaped fixed electrode 2 is placed in the closed container 1 whose pressure is reduced to rr or less.
And the movable electrode 3 are arranged to face each other with a slight gap. The movable electrode 3 is formed by fixing an inverted U-shaped bimetal to a support rod. When a predetermined voltage is applied between the fixed electrode 2 and the movable electrode 3, a vacuum discharge is generated, and a slight amount of heat is generated by the discharge heat. The bimetal is deformed with time and the movable electrode 3 comes into contact with the fixed electrode 2.
【０００８】可動電極３のバイメタルの部分にニクロム
線等からなる電熱線４が巻回され、電熱線４の一端が可
動電極３に、また、その他端が電極端子５にそれぞれ接
続されている。もう一方の電極端子６には固定電極２が
接続されている。A heating wire 4 made of a nichrome wire or the like is wound around the bimetal portion of the movable electrode 3, one end of the heating wire 4 is connected to the movable electrode 3, and the other end is connected to the electrode terminal 5. The fixed electrode 2 is connected to the other electrode terminal 6.
【０００９】次にその動作について説明する。この電流
トランス用安全器の電極端子５、６を図２の電流トラン
ス１３の２次巻線１４に放電管１５と並列に接続してお
くものとする。いま、何らかの原因で放電管１５が切れ
て電流トランス１３の２次巻線１４が開放状態になった
とすると、２次巻線１４には放電管１５の放電電圧より
はるかに（ほぼ一桁）高い電圧が現れ、この電圧により
可動電極３と固定電極２との間で真空放電が始まる。す
ると、放電の熱により可動電極３のバイメタルが変形し
て固定電極２に接触し、放電が停止しても今度は電熱線
４が発熱することによりバイメタルが変形したままの状
態に保たれ、可動電極３と固定電極２とは短絡したまま
保持される。Next, the operation will be described. It is assumed that the electrode terminals 5 and 6 of the current transformer safety device are connected to the secondary winding 14 of the current transformer 13 of FIG. 2 in parallel with the discharge tube 15. If, for some reason, the discharge tube 15 is cut off and the secondary winding 14 of the current transformer 13 is opened, the secondary winding 14 has a voltage higher than the discharge voltage of the discharge tube 15 (approximately one digit). A voltage appears, and this voltage starts a vacuum discharge between the movable electrode 3 and the fixed electrode 2. Then, the bimetal of the movable electrode 3 is deformed by the heat of the discharge and comes into contact with the fixed electrode 2, and even if the discharge is stopped, the heating wire 4 generates heat this time so that the bimetal is kept in the deformed state and is moved. The electrode 3 and the fixed electrode 2 are held while being short-circuited.
【００１０】上記実施例に於ては、放電を起しやすくす
るために密閉容器１内を真空にしているが、必ずしもそ
の必要はなく、大気圧で火花放電を起させてもよいし、
あるいは、アルゴン、ネオン、その他の気体を入れてグ
ロー放電を起すようにしてもよい。In the above embodiment, the closed container 1 is evacuated in order to facilitate discharge, but this is not always necessary, and spark discharge may be generated at atmospheric pressure.
Alternatively, argon, neon, or other gas may be introduced to cause glow discharge.
【００１１】[0011]
【発明の効果】以上説明したとおり、この発明の電流ト
ランス用安全器は、電流トランスの負荷が開放状態とな
ったとき自動的に短絡することができ高電圧や過熱によ
る事故を防止することができ、部品点数が少なく構成が
きわめて簡単であり、動作が確実で故障するおそれもな
く、無結線放電管照明器具に限らず、大電流測定の際電
流計と併用する変流器や各種の計測に使用する電流トラ
ンスの２次側の開放防止に使用することができるもので
ある。As described above, the safety device for a current transformer of the present invention can automatically short-circuit when the load of the current transformer is opened, and can prevent accidents due to high voltage or overheating. It is possible, the number of parts is small, the configuration is extremely simple, the operation is reliable and there is no danger of failure, and it is not limited to connectionless discharge tube lighting fixtures, but also current transformers and various measurements used with ammeters for large current measurement It can be used to prevent the secondary side of the current transformer used for the secondary side from being opened.
【図１】この発明の実施例の断面図FIG. 1 is a sectional view of an embodiment of the present invention.
【図２】この発明の電流トランス用安全器を使用する無
結線放電管照明器具の概略図FIG. 2 is a schematic view of a connectionless discharge tube lighting fixture using the current transformer cutout of the present invention.
１ 密閉容器 ２ 固定電極 ３ 可動電極
４ 電熱線 ５ 電極端子 ６ 電極端子 １１ 定電流電源 １２ 給電線 １３ 電
流トランス １４ ２次巻線 １５ 放電管1 Airtight Container 2 Fixed Electrode 3 Movable Electrode 4 Heating Wire 5 Electrode Terminal 6 Electrode Terminal 11 Constant Current Power Supply 12 Power Supply Line 13 Current Transformer 14 Secondary Winding 15 Discharge Tube
Claims (1)
動電極と固定電極とを密閉容器中に微小間隔を置いて対
向配置し、電熱線の一端を可動電極に接続するとともに
電熱線の他端と固定電極とを２つの電極端子にそれぞれ
接続した電流トランス用安全器。1. A movable electrode made of a bimetal wound with a heating wire and a fixed electrode are arranged to face each other in a sealed container with a minute gap therebetween, and one end of the heating wire is connected to the movable electrode and the other end of the heating wire is connected. A safety device for a current transformer in which a fixed electrode and a fixed electrode are respectively connected to two electrode terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4194633A JP2649459B2 (en) | 1992-06-30 | 1992-06-30 | Safety device for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4194633A JP2649459B2 (en) | 1992-06-30 | 1992-06-30 | Safety device for current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0620573A true JPH0620573A (en) | 1994-01-28 |
| JP2649459B2 JP2649459B2 (en) | 1997-09-03 |
Family
ID=16327763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4194633A Expired - Lifetime JP2649459B2 (en) | 1992-06-30 | 1992-06-30 | Safety device for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2649459B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS455075Y1 (en) * | 1965-08-16 | 1970-03-10 | ||
| JPS5144114U (en) * | 1974-09-28 | 1976-04-01 | ||
| JPS5150625U (en) * | 1974-10-17 | 1976-04-17 | ||
| JPS645360U (en) * | 1987-06-30 | 1989-01-12 |
-
1992
- 1992-06-30 JP JP4194633A patent/JP2649459B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS455075Y1 (en) * | 1965-08-16 | 1970-03-10 | ||
| JPS5144114U (en) * | 1974-09-28 | 1976-04-01 | ||
| JPS5150625U (en) * | 1974-10-17 | 1976-04-17 | ||
| JPS645360U (en) * | 1987-06-30 | 1989-01-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2649459B2 (en) | 1997-09-03 |
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