JPH04340480A - Measuring method for zero-phase current of distribution board - Google Patents
Measuring method for zero-phase current of distribution boardInfo
- Publication number
- JPH04340480A JPH04340480A JP20660191A JP20660191A JPH04340480A JP H04340480 A JPH04340480 A JP H04340480A JP 20660191 A JP20660191 A JP 20660191A JP 20660191 A JP20660191 A JP 20660191A JP H04340480 A JPH04340480 A JP H04340480A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- short
- zero
- plug
- current
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
Landscapes
- Distribution Board (AREA)
Abstract
Description
【０００１】0001
【０００２】 本発明は、分電盤の零相電流測定に関
する。[0002]The present invention relates to zero-sequence current measurement of a distribution board.
【０００３】 分電盤の分岐回路で漏電があると、そ
の漏洩電流は電源変圧器のアース線に流入するので、電
源変圧器のアース電流を計れば漏電を知ることができる
。
しかし、どの分岐回路で漏電しているかを知ることは出
来ない。[0003] When there is a leakage in a branch circuit of a distribution board, the leakage current flows into the ground wire of the power transformer, so the leakage can be detected by measuring the ground current of the power transformer. However, it is not possible to know in which branch circuit the current is leaking.
【０００４】 分電盤にはコンピュータや空調関係の
負荷が接続されているが、これらの負荷は常時運転され
ている場合が多く、従って、電源スイッチを切って多く
の分岐回路を点検し、絶縁抵抗を測定し、漏電の有無を
確認することは困難である。[0004] Loads related to computers and air conditioning are connected to the distribution board, but these loads are often in constant operation, so it is necessary to turn off the power switch, inspect many branch circuits, and insulate them. It is difficult to measure resistance and check for leakage.
【０００５】 そこで、分岐回路の漏洩電流は回路の
零相電流として現れるので、クランプ電流計で回路の電
線を全部いっしょにクランプすれば、零相電流を計るこ
とができて、負荷を生かしたまま漏電の点検が可能であ
る。しかし分電盤においては、一般に分岐回路の数が多
いので、かなり太い線が込合って、クランプ部を形成す
ることが困難である。また、クランプ部を形成するため
に電線を動かすことは、電線接続部分にゆるみを生ずる
おそれがあり、危険である。Therefore, since the leakage current in the branch circuit appears as the zero-sequence current in the circuit, if all the wires in the circuit are clamped together with a clamp ammeter, the zero-sequence current can be measured, and the current can be measured while keeping the load alive. It is possible to check for electrical leakage. However, in a distribution board, there are generally a large number of branch circuits, and therefore quite thick wires are crowded together, making it difficult to form a clamp portion. Furthermore, moving the wire to form the clamp portion is dangerous as it may cause the wire connection portion to become loose.
【０００６】 以上のようなことから、従来の技術で
は、電源スイッチを切らないでコンピュータ等の負荷を
生かしたまま、分電盤の零相電流を測定することは極め
て困難である。このため分岐回路の漏電の点検ができな
いままになっており、漏電による火災発生のおそれがあ
る。[0006]For the reasons described above, with the conventional technology, it is extremely difficult to measure the zero-sequence current of a distribution board without turning off the power switch and keeping the load such as a computer alive. For this reason, it is not possible to check for leakage in the branch circuit, and there is a risk of a fire occurring due to the leakage.
【０００７】 分電盤のコンピュータ等の負荷を生か
したまま、個々の分岐回路の零相電流を測定し、漏電の
点検が出来るようにして、電気設備の安全を図ることが
、本発明が解決しようとする課題である。[0007]The present invention solves the problem of ensuring the safety of electrical equipment by measuring the zero-sequence current of each branch circuit and making it possible to check for leakage while keeping the loads such as computers on the distribution board alive. This is an issue that we are trying to solve.
【０００８】 上記の課題を解決するために、本発明
では、分電盤の１線アースの単相回路において、配線用
遮断器とアース切離しスイッチの開閉部に並列に接続し
たソケット部と、出力側を２本の短絡電線で短絡したプ
ラグを用意する。[0008] In order to solve the above problems, the present invention provides a socket section connected in parallel to the opening/closing section of a molded circuit breaker and an earth disconnection switch, and an output Prepare a plug whose sides are shorted with two shorted wires.
【０００９】 そこで、ソケットにプラグを差込むと
、並列短絡回路ができて配線用遮断器とアース切離しス
イッチの開閉部が、それぞれ短絡されるので、そこで、
配線用遮断器とアース切離しスイッチをＯＦＦすると、
回路の電流が並列短絡回路に流れるため、プラグの短絡
電線を２本一緒にクランプして単相回路の零相電流を計
ることが出来る。計り終わったならば、配線用遮断器と
アース切離しスイッチをＯＮした後プラグを抜き、正常
状態に戻す。[0009] Therefore, when the plug is inserted into the socket, a parallel short circuit is created and the opening/closing parts of the molded circuit breaker and the earth disconnection switch are short-circuited.
When you turn off the molded circuit breaker and earth disconnection switch,
Since the circuit current flows in a parallel shorted circuit, the zero-sequence current of a single-phase circuit can be measured by clamping the two shorted wires of the plug together. Once the measurement is complete, turn on the circuit breaker and ground disconnection switch, then pull out the plug to return to normal condition.
【００１０】 並列短絡回路に流れる電流は短時間で
あるから、ソケットに配線する電線を細くすることがで
きるので、配線スペースは小さくてすむ。また、プラグ
は各分岐回路のソケットにたいして共通に１個あればよ
い。従って、大幅なコスト高とスペース増加をもたらす
ことなく、個々の回路の零相電流を計ることが出来る。
さらに、回路に負荷をつなぎ、生きたままの状態で、零
相電流を計ることができるという利点がある。[0010]Since the current flowing through the parallel short circuit is for a short time, the electric wire wired to the socket can be made thinner, so that the wiring space can be reduced. Further, it is sufficient that there is only one plug in common for the sockets of each branch circuit. Therefore, the zero-sequence current of each circuit can be measured without significantly increasing cost and space. Another advantage is that the zero-sequence current can be measured while a load is connected to the circuit and the circuit is still alive.
【００１１】 図１は本発明の一実施例を示す分電盤
回路図である。１は単相３線式の電源変圧器で、２次側
端子はｕ、ｏ、ｖとなっており、１００Ｖ、と２００Ｖ
の回路が使用できる。２は主回路の配線用遮断器で３と
４は１００Ｖ、５は２００Ｖの分岐回路の配線用遮断器
である。分岐回路の数はもっと多いが省略した。FIG. 1 is a distribution board circuit diagram showing an embodiment of the present invention. 1 is a single-phase 3-wire power transformer, and the secondary terminals are u, o, and v, and the voltage is 100V and 200V.
circuits can be used. 2 is a molded case circuit breaker for the main circuit, 3 and 4 are molded case breakers for the 100V branch circuit, and 5 is a molded case circuit breaker for the 200V branch circuit. There are many more branch circuits, but they have been omitted.
【００１２】 電源変圧器１の２次側中点ｏは接地さ
れているので、分岐回路の負荷側の絶縁測定のためには
負荷側をアースから切離さねばならない。６、７はその
ためのアース切離しスイッチである。８と９は１００Ｖ
の分岐回路のソケットで、その入力側は配線用遮断器及
びアース切離しスイッチの開閉部に並列に配線される。
１０は２００Ｖの分岐回路のソケットで、その入力側は
２極の配線用遮断器５に接続される。１１はプラグで、
その出力側は短絡電線１２，１３によって短絡接続され
る。Since the middle point o of the secondary side of the power transformer 1 is grounded, in order to measure the insulation on the load side of the branch circuit, the load side must be disconnected from the ground. 6 and 7 are ground disconnection switches for this purpose. 8 and 9 are 100V
A branch circuit socket whose input side is wired in parallel to the opening/closing part of the molded case circuit breaker and earth disconnection switch. 10 is a socket for a 200V branch circuit, and its input side is connected to a two-pole molded case circuit breaker 5. 11 is a plug,
Its output side is short-circuited by short-circuit wires 12 and 13.
【００１３】 以上のような構成において、分岐回路
の電流測定方法を説明する。先ず、ソケット８にプラグ
１１を差込むと、短絡電線１２によって配線用遮断器３
の開閉部が短絡され、同様にして、短絡電線１３によっ
てアース切離しスイッチ６の開閉部が短絡される。この
状態においては、分岐回路の電流は配線用遮断器３を流
れるとともに、その一部は並列短絡回路をなす短絡電線
１２を流れる。同様にして、電流はアース切離しスイッ
チ６を流れるとともに、その一部は短絡電線１３を流れ
る。そこで、配線用遮断器３とアース切離しスイッチ６
をＯＦＦすると分岐回路の電流はすべて短絡電線１２，
１３を流れるので、短絡電線１２，１３をクランプ電流
計で一緒にクランプして、零相電流を計ることが出来る
。２本の短絡電線を一緒にクランプすることにより、わ
ずかな零相電流でも計ることができる。また、１本の短
絡電線をクランプすれば分岐回路の電流を計ることがで
きる。[0013]A method for measuring the current in the branch circuit in the above configuration will be explained. First, when the plug 11 is inserted into the socket 8, the circuit breaker 3 is connected by the short circuit wire 12.
Similarly, the opening/closing part of the earth disconnection switch 6 is short-circuited by the short-circuit wire 13. In this state, the current in the branch circuit flows through the molded circuit breaker 3, and part of it flows through the short circuit wire 12 forming a parallel short circuit. Similarly, current flows through the earth disconnection switch 6 and a portion of it flows through the short-circuit wire 13. Therefore, the molded circuit breaker 3 and the earth disconnection switch 6
When OFF, all the current in the branch circuit is transferred to the short-circuit wire 12,
13, the zero-sequence current can be measured by clamping the shorted wires 12 and 13 together with a clamp ammeter. By clamping two shorted wires together, even small zero-sequence currents can be measured. Furthermore, by clamping one shorted wire, the current in a branch circuit can be measured.
【００１４】 ２００Ｖ回路のソケット１０にプラグ
１１を差込んだ場合は、２極の配線用遮断器５の開閉部
が短絡されるので、そこで、配線用遮断器５をＯＦＦし
て、零相電流を計ることができる。When the plug 11 is inserted into the socket 10 of a 200V circuit, the opening/closing part of the two-pole molded case circuit breaker 5 is short-circuited, so the molded case circuit breaker 5 is turned OFF and the zero-sequence current can be measured.
【００１５】 ２本の短絡電線１２，１３を一緒にク
ランプして零相電流を計ると、正常時は電流はゼロとな
るが、もし、ある電流値を計測したときは、それは負荷
回路のアースへの漏洩電流を示す。When the zero-sequence current is measured by clamping the two short-circuited wires 12 and 13 together, the current is zero under normal conditions, but if a certain current value is measured, it may be due to the grounding of the load circuit. Indicates the leakage current to.
【００１６】 電流を計り終わったならば、配線用遮
断器３とアース切離しスイッチを投入し、投入確認の後
プラグ１１を抜けば、電流測定は完了する。プラグは各
回路共通に１個あればよく、プラグ１１を他の分岐回路
のソケットに次々と差込んで零相電流を計ることができ
る。After measuring the current, turn on the molded circuit breaker 3 and the earth disconnection switch, and after confirming that they are on, pull out the plug 11 to complete the current measurement. One plug is sufficient for each circuit, and the zero-sequence current can be measured by inserting the plug 11 into the sockets of other branch circuits one after another.
【発明の効果】以上の説明から明らかなように、本発明
によって、分電盤のコンピュータ等の負荷を生かしたま
ま、個々の分岐回路の零相電流を測定し、漏電の点検が
出来るようになる。また、並列短絡回路に流れる電流は
測定時だけで、短時間であるから、ソケットに配線する
電線は細くてよいので、配線スペースは小さくてすむ。
また、プラグは各分岐回路のソケットに対して共通に１
個あればよいので、大幅なコスト高とはならない。[Effects of the Invention] As is clear from the above explanation, the present invention makes it possible to measure the zero-sequence current of each branch circuit and check for earth leakage while keeping the loads such as computers on the distribution board alive. Become. Furthermore, since the current flowing through the parallel short circuit is only during measurement and for a short time, the wires connected to the sockets can be thin, so the wiring space can be small. In addition, one plug is commonly used for each branch circuit socket.
Since it is only necessary to have one, the cost will not increase significantly.
【図１】本発明に係わる分電盤の零相電流測定方法の一
実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of a zero-sequence current measurement method for a distribution panel according to the present invention.
１…電源変圧器 ２…配線用遮断器 ３、４、５…配線用遮断器 ６、７…アース切離しスイッチ ８、９、１０…ソケット １１…プラグ １２，１３…短絡電線 1...Power transformer 2...Made-in circuit breaker 3, 4, 5...Made-in circuit breaker 6, 7...Earth disconnection switch 8, 9, 10...socket 11...Plug 12, 13... Short circuit wire
Claims (1)
する分電盤の単相回路において、該配線用遮断器と該ア
ース切離しスイッチの開閉部に並列に接続したソケット
部と、出力側を２本の短絡電線で短絡したプラグ部を有
し、該ソケット部に該プラグ部を差込んだ後、該配線用
遮断器と該アース切離しスイッチを開路し、クランプ電
流計で該短絡電線を２本一緒にクランプして零相電流を
測定することを特徴とする分電盤の零相電流測定方法。Claim 1: In a single-phase circuit of a distribution board having a molded case circuit breaker and a ground disconnection switch, a socket part connected in parallel to the opening/closing part of the molded case circuit breaker and the ground disconnection switch, and an output side connected to two After inserting the plug into the socket, open the molded circuit breaker and the earth disconnection switch, and connect the two short-circuited wires with a clamp ammeter. A method for measuring zero-sequence current in a distribution board, characterized by measuring zero-sequence current by clamping them together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20660191A JPH04340480A (en) | 1991-05-16 | 1991-05-16 | Measuring method for zero-phase current of distribution board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20660191A JPH04340480A (en) | 1991-05-16 | 1991-05-16 | Measuring method for zero-phase current of distribution board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04340480A true JPH04340480A (en) | 1992-11-26 |
Family
ID=16526096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20660191A Pending JPH04340480A (en) | 1991-05-16 | 1991-05-16 | Measuring method for zero-phase current of distribution board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04340480A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459353A (en) * | 2014-11-27 | 2015-03-25 | 国家电网公司 | PLC transmission instrument |
| DE212014000127U1 (en) | 2013-05-15 | 2015-12-21 | Futaba Industrial Co. Ltd. | Torsionsträgeraufhängung |
-
1991
- 1991-05-16 JP JP20660191A patent/JPH04340480A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE212014000127U1 (en) | 2013-05-15 | 2015-12-21 | Futaba Industrial Co. Ltd. | Torsionsträgeraufhängung |
| CN104459353A (en) * | 2014-11-27 | 2015-03-25 | 国家电网公司 | PLC transmission instrument |
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