JPH0634667A - Measuring device for current of dc main circuit and dc circuit breaker using the same - Google Patents
Measuring device for current of dc main circuit and dc circuit breaker using the sameInfo
- Publication number
- JPH0634667A JPH0634667A JP4189487A JP18948792A JPH0634667A JP H0634667 A JPH0634667 A JP H0634667A JP 4189487 A JP4189487 A JP 4189487A JP 18948792 A JP18948792 A JP 18948792A JP H0634667 A JPH0634667 A JP H0634667A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- shunt
- main circuit
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は分流回路に直流変流器を
設けて直流回路の電流を測定する直流主回路の電流測定
装置およびそれを用いた直流遮断器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current measuring device for a DC main circuit, which is provided with a DC current transformer in a shunt circuit, and measures the current of the DC circuit, and a DC circuit breaker using the same.
【０００２】[0002]
【従来の技術】従来の直流主回路の電流測定は、例えば
特開昭５４−１４９８７３号公報に記載されているよう
に、直流主回路に直流変流器を設け、この直流変流器で
直流主回路の電流を直接測定するようにしているが、こ
のような測定では、測定用の直流変流器が主回路電流に
対応して大形化してしまい、また大形の直流変流器で過
渡応答特性の良いものとなると極めて高価になってしま
う。一方、直流主回路に並列な分流回路を設置し、この
分流回路に小形の直流変流器を設け、この直流変流器で
分流電流を測定し、これを主回路電流に換算して測定す
ることが知られている。2. Description of the Related Art A conventional DC main circuit has a DC current transformer provided in the DC main circuit as described in, for example, Japanese Patent Laid-Open No. 54-149873. The current of the main circuit is measured directly, but in such measurement, the DC current transformer for measurement becomes large in size corresponding to the current of the main circuit, and also with a large DC current transformer. If the transient response characteristic is good, it will be extremely expensive. On the other hand, a parallel shunt circuit is installed in the DC main circuit, a small DC current transformer is installed in this shunt circuit, the shunt current is measured with this DC current converter, and this is converted to the main circuit current for measurement. It is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上述した
分流回路を用いた電流測定では、過渡電流に対する応答
特性について十分な考慮がなされず、必ずしも分流回路
での過渡電流に対する応答特性が直流主回路と合致して
いない。すなわち、直流主回路に並列な分流回路を設
け、この分流回路を流れる電流を測定して直流主回路を
流れる電流に換算するには、直流主回路と分流回路の抵
抗比Ｎを求め、分流回路で測定された電流値にＮ倍した
ものが直流主回路を流れる電流に一致していなければな
らないが、直流主回路側と分流回路側の回路定数、つま
り抵抗とリアクタンスの比が等しくなければ、過渡電流
測定時に、分流回路で測定した電流値と、直流主回路で
測定した電流値とが異なってしまう。例えば、図２に示
すように分流回路側の回路定数が直流主回路側の実際の
回路定数よりも小さいと、実際の直流主回路の電流Ａよ
り大きな値の電流Ｃとして換算してしまうし、一方、分
流回路側の回路定数が直流主回路側の実際の回路定数よ
りも大きいと、実際の直流主回路の電流Ａより小さな値
の電流Ｂとして換算してしまうことになる。従って、こ
のような直流主回路の電流測定装置を直流遮断器に用い
た場合、電流変化率が大きく直ちに遮断すべき電流が実
際の直流主回路を流れているにも拘らず、遮断指令が与
えられなかったり、実際には遮断すべき電流ではないの
に遮断指令が与えられて直流遮断器の誤動作となってし
まう。However, in the above-described current measurement using the shunt circuit, the response characteristic to the transient current is not sufficiently taken into consideration, and the response characteristic to the transient current in the shunt circuit is not necessarily the same as that of the DC main circuit. I haven't done it. That is, in order to provide a shunt circuit in parallel with the DC main circuit and measure the current flowing through the shunt circuit and convert it into the current flowing through the DC main circuit, the resistance ratio N between the DC main circuit and the shunt circuit is obtained, and the shunt circuit is obtained. The current value measured in N multiplied by N must match the current flowing through the DC main circuit, but if the circuit constants on the DC main circuit side and the shunt circuit side, that is, the resistance and reactance ratios are not equal, When measuring the transient current, the current value measured by the shunt circuit and the current value measured by the DC main circuit are different. For example, as shown in FIG. 2, if the circuit constant on the side of the shunt circuit is smaller than the actual circuit constant on the side of the DC main circuit, it will be converted into a current C having a value larger than the current A of the actual DC main circuit. On the other hand, if the circuit constant on the side of the shunt circuit is larger than the actual circuit constant on the side of the DC main circuit, it will be converted into the current B having a value smaller than the current A of the actual DC main circuit. Therefore, when such a DC main circuit current measuring device is used for a DC circuit breaker, the breaking command is given even though the current change rate is large and the current to be immediately cut flows through the actual DC main circuit. If the current is not cut off, or the current is not the current to be cut off, the cutoff command is given and the DC breaker malfunctions.
【０００４】本発明の第一番目の目的は、分流回路に設
けた直流変流器を用いて正確に直流主回路の電流を換算
することができる直流主回路の電流測定装置を提供する
にある。また本発明の第二番目の目的は、分流回路に設
けた直流変流器を用いて正確に直流主回路の電流を換算
し、これに基いて正確に対応する動作を行なう信頼性の
高い直流遮断器を提供するにある。A first object of the present invention is to provide a DC main circuit current measuring device capable of accurately converting the current of the DC main circuit by using a DC current transformer provided in a shunt circuit. . A second object of the present invention is to provide a highly reliable DC which accurately converts the current of the DC main circuit by using the DC current transformer provided in the shunt circuit, and performs an accurate corresponding operation based on this. To provide a circuit breaker.
【０００５】[0005]
【課題を解決するための手段】本発明は上記第一番目の
目的を達成するために、直流主回路の主回路に並列に分
流回路を接続し、この分流回路に直流変流器を設置して
成る直流主回路の電流測定装置において、上記分流回路
にそのリアクタンスが可変なインダクタンス素子を設け
たことを特徴とする。本発明は上記第二番目の目的を達
成するために、直流主回路に直流遮断器接点を接続し、
上記直流主回路の電流を直流変流器によって検出し、過
電流継電器を介して上記直流遮断器接点に動作指令を与
えるように構成した直流遮断器において、上記直流主回
路の主回路に上記直流遮断器接点を接続し、また上記主
回路に並列に分流回路を接続し、この分流回路に上記直
流変流器と、そのリアクタンスが可変なインダクタンス
素子を設けたことを特徴とするIn order to achieve the first object, the present invention connects a shunt circuit in parallel to the main circuit of a DC main circuit, and installs a DC current transformer in this shunt circuit. In the current measuring device for the DC main circuit, which is configured as described above, the shunt circuit is provided with an inductance element whose reactance is variable. In order to achieve the second object, the present invention connects a DC breaker contact to a DC main circuit,
In a DC circuit breaker configured to detect the current of the DC main circuit by a DC current transformer and give an operation command to the DC circuit breaker contact via an overcurrent relay, the DC circuit in the main circuit of the DC main circuit A circuit breaker contact is connected, and a shunt circuit is connected in parallel to the main circuit, and the shunt circuit is provided with the DC current transformer and an inductance element whose reactance is variable.
【０００６】[0006]
【作用】本発明による直流主回路の電流測定装置は、上
述のように分流回路にそのリアクタンスが可変なインダ
クタンス素子を設けたため、分流回路のリアクタンスを
変化させて分流回路の回路定数を調整し、主回路と分流
回路の応答特性を合わせることができ、分流回路を流れ
る分流電流から正確に対応する主回路の電流を換算する
ことができる。また本発明による直流遮断器は、上述し
たように分流回路にそのリアクタンスが可変なインダク
タンス素子を設けて分流回路のリアクタンスを変化させ
て分流回路の回路定数を調整し、主回路と分流回路の応
答特性を合わせ、分流回路を流れる分流電流から正確に
対応する主回路の電流を過電流継電器で得、これを基に
遮断指令を与えるようにしたため、小型の直流変流器を
用いて誤動作等を防止して信頼性を向上させることがで
きる。Since the DC main circuit current measuring device according to the present invention is provided with the inductance element whose reactance is variable in the shunt circuit as described above, the reactance of the shunt circuit is changed to adjust the circuit constant of the shunt circuit. It is possible to match the response characteristics of the main circuit and the shunt circuit, and it is possible to accurately convert the current of the corresponding main circuit from the shunt current flowing through the shunt circuit. Further, in the DC circuit breaker according to the present invention, as described above, an inductance element whose reactance is variable is provided in the shunt circuit to change the reactance of the shunt circuit to adjust the circuit constants of the shunt circuit and to make the response of the main circuit and the shunt circuit. By matching the characteristics, the current of the main circuit that corresponds accurately from the shunt current flowing through the shunt circuit was obtained by the overcurrent relay, and the cutoff command was given based on this, so malfunctions such as small DC current transformers could be used. It can prevent and improve reliability.
【０００７】[0007]
【実施例】以下本発明の実施例を図面によって説明す
る。図１は本発明の一実施例による直流主回路の電流測
定装置を示す構成図で、直流主回路を成す主導体３に分
流回路を成す分流導体２を電気的並列に接続し、この分
流導体２を包囲して硅素鋼板を軸方向に積層した積層鉄
心、フェライトコア等からなるリング状のインダクタン
ス素子１と直流変流器４を設けている。インダクタンス
素子１は、例えば図４に示すように、半円筒状に成した
一対の鉄心１ａ，１ｂの対向部間に予め所定の厚さにさ
れた絶縁物５を介在し、両鉄心１ａ，１ｂの対向部近傍
にそれぞれ機械的に結合した取付部材６ａ，６ｂ間をボ
ルト７によって締め付け、両鉄心１ａ，１ｂの対向部間
に空隙ｇを形成して構成されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a current measuring device for a DC main circuit according to an embodiment of the present invention, in which a shunt conductor 2 forming a shunt circuit is electrically connected in parallel to a main conductor 3 forming a DC main circuit. A ring-shaped inductance element 1 composed of a laminated iron core, a ferrite core, etc., which surrounds 2 and axially laminated silicon steel plates, and a DC current transformer 4 are provided. For example, as shown in FIG. 4, the inductance element 1 has an insulator 5 having a predetermined thickness interposed between opposing portions of a pair of semi-cylindrical iron cores 1a and 1b, and the two iron cores 1a and 1b. The mounting members 6a and 6b, which are mechanically coupled to each other in the vicinity of the opposing portions, are tightened with bolts 7 to form a gap g between the opposing portions of the two iron cores 1a and 1b.
【０００８】このような構成の直流主回路において、定
常状態で流れる全電流Ｉは、主導体３を流れる主電流Ｉ
1 と、分流導体２を流れる分流電流Ｉ2 とに分散して流
れることになり、分流電流Ｉ2 が直流変流器４によって
測定されることになる。しかしながら、上述した直流主
回路を電気回路記号を用いて回路図に書き直すと図３に
示すように、主導体３から成る主回路は抵抗Ｒ1 とリア
クタンスＬ1 によって表わされ、分流導体２から成る分
流回路は抵抗Ｒ2 とインダクタンス素子１を含むリアク
タンスＬ2 によって表わされる。従って、この直流主回
路に定電流が流れる場合、主導体３の抵抗Ｒ1 と分流導
体２の抵抗Ｒ2 の比に比例した主電流Ｉ1 と分流電流Ｉ
2 が流れることになり、直流変流器４によって測定され
た分流電流Ｉ2 の電流値から主電流Ｉ1 もしくは全電流
Ｉを換算して求めることができる。しかしながら、直流
主回路に遮断すべき電流が流れる場合、それは図２に示
す電流Ａのような過渡電流であるため、直流変流器４で
測定した分流電流Ｉ2 の電流値を（Ｒ2／Ｒ1）倍した値
が、主電流Ｉ1 と一致するようにするには（Ｒ2／Ｒ1＝
Ｌ2／Ｌ1）となるようにする必要がある。そこで、この
等式が成立するリアクタンスＬ2となるように、図４に
示したインダクタンス素子１の空隙ｇを変更するわけで
あるが、予め用意した厚みの異なる複数の絶縁物５の中
から変更する空隙ｇに対応する厚みの絶縁物５を選定
し、それを両鉄心ア１ａ，１ｂの対向部間に介在させて
再びボルト７で締め付ければ良い。In the DC main circuit having such a configuration, the total current I flowing in the steady state is the main current I flowing in the main conductor 3.
1 and the shunt current I 2 flowing through the shunt conductor 2 are dispersed, and the shunt current I 2 is measured by the DC current transformer 4. However, when the above DC main circuit is rewritten in the circuit diagram using electric circuit symbols, as shown in FIG. 3, the main circuit composed of the main conductor 3 is represented by the resistor R 1 and the reactance L 1, and is divided from the shunt conductor 2. The shunt circuit formed is represented by a reactance L 2 including a resistance R 2 and an inductance element 1. Therefore, in this case the the DC main circuit constant current flows, the main conductor 3 of the resistor R 1 and shunt conductor 2 of the resistor shunt with the main current I 1 proportional to the ratio of R 2 current I
2 flows, and the main current I 1 or the total current I can be converted from the current value of the shunt current I 2 measured by the DC current transformer 4. However, when a current to be interrupted flows in the DC main circuit, it is a transient current like the current A shown in FIG. 2, and therefore the current value of the shunt current I 2 measured by the DC current transformer 4 is (R 2 / To make the value multiplied by R 1 ) coincide with the main current I 1 (R 2 / R 1 =
L 2 / L 1 ). Therefore, the gap g of the inductance element 1 shown in FIG. 4 is changed so that the reactance L 2 that satisfies this equation is obtained. However, it is changed from among a plurality of insulators 5 having different thicknesses prepared in advance. It suffices to select an insulator 5 having a thickness corresponding to the gap g to be formed, interpose it between the opposing portions of the iron cores 1a and 1b, and tighten the bolt 7 again.
【０００９】このような構成によれば、分流回路に設け
た比較的小電流用の直流変流器４を用いて、主回路を流
れる主電流Ｉ1 を正確に検出することができる。尚、上
述した実施例ではインダクタンス素子１として二分割さ
れたリング状鉄心を用い、その接合面間の空隙ｇを変更
してリアクタンスＬ2 を調整するようにしたが、インダ
クタンス素子１として積層鉄心を用い、その軸方向長
さ、すなわち積層枚数を増減して所望のリアクタンスＬ
2 を得るようにしても良い。また上述した実施例におけ
るインダクタンス素子１では両鉄心１ａ，１ｂの対向部
間に絶縁物５を介在させて空隙ｇを設定したが、絶縁物
５を省略したり、図４の取付部材６ａ，６ｂ間に絶縁物
５を介在して空隙ｇを設定するようにしても良い。更に
インダクタンス素子１としてコイルを用いることもでき
るが、分流回路のリアクタンス値だけでなく抵抗値も変
化してしまうため、直流主回路の電流値が一定になった
定電流の場合の分流回路で測定される電流値の絶対値も
変化してしまい、分流回路で測定された電流値を何倍す
れば直流主回路電流となるかが一定でなくなるので、倍
数対応別回路を設置しなければならず構成が複雑になっ
てしまう。With such a structure, the main current I 1 flowing through the main circuit can be accurately detected by using the DC current transformer 4 for relatively small current provided in the shunt circuit. In the above-mentioned embodiment, the ring-shaped iron core divided into two is used as the inductance element 1 and the reactance L 2 is adjusted by changing the gap g between the joint surfaces, but the laminated iron core is used as the inductance element 1. The desired reactance L can be obtained by increasing or decreasing the axial length, that is, the number of laminated layers.
You may get 2 . Further, in the inductance element 1 in the above-described embodiment, the insulator 5 is interposed between the facing portions of the iron cores 1a and 1b to set the gap g, but the insulator 5 may be omitted or the mounting members 6a and 6b of FIG. A gap g may be set with an insulator 5 interposed therebetween. Further, a coil can be used as the inductance element 1, but since not only the reactance value of the shunt circuit but also the resistance value changes, measurement is performed with a shunt circuit when the current value of the DC main circuit is constant. The absolute value of the current value also changes, and it is not constant how many times the current value measured in the shunt circuit becomes the DC main circuit current.Therefore, it is necessary to install a circuit corresponding to multiples. The configuration becomes complicated.
【００１０】図５は、上述した直流主回路の電流測定装
置を用いて構成した直流遮断器を示している。直流遮断
器１０は直流電源１４と負荷１５間に接続されており、
直流遮断器１０を構成する部分内の直流主回路を成す主
導体３に分流導体２を電気的並列に接続し、この分流導
体２を包囲して上述したリアクタンスが可変なインダク
タンス素子１と直流変流器４が設けられ、直流変流器４
の出力は過電流継電器１２に取込まれ、遮断すべき電流
を検出したとき直流遮断器接点１１を開路操作する駆動
装置１３に動作信号を与えるように構成されている。こ
の主導体３と分流導体２における抵抗Ｒ1，Ｒ2とリアク
タンスＬ1，Ｌ2の関係は上述の場合と同様であり、過電
流継電器１２は、一般に知られるように分流導体２を流
れる分流電流Ｉ2を直流変流器４によって検出した後、
上述の抵抗Ｒ1，Ｒ2とインダクタンスＬ1，Ｌ2 の関係
から主電流Ｉ1 に換算し、これが所定の値になったり、
所定の電流変化率になったとき、駆動装置１３に動作信
号を与えるように構成されている。FIG. 5 shows a DC circuit breaker constructed by using the current measuring device for the DC main circuit described above. The DC breaker 10 is connected between the DC power supply 14 and the load 15,
A shunt conductor 2 is electrically connected in parallel to a main conductor 3 forming a dc main circuit in a portion of the dc circuit breaker 10, and the shunt conductor 2 is surrounded to form an inductance element 1 and a dc transformer whose reactance is variable. The current transformer 4 is provided and the DC current transformer 4 is provided.
Is output to the overcurrent relay 12, and when an electric current to be interrupted is detected, it is configured to give an operation signal to the drive device 13 that opens the DC circuit breaker contact 11. The relationship between the resistances R 1 and R 2 and the reactances L 1 and L 2 in the main conductor 3 and the shunt conductor 2 is the same as in the above-described case, and the overcurrent relay 12 has a shunt current flowing in the shunt conductor 2 as is generally known. After detecting the current I 2 by the DC current transformer 4,
From the relationship between the resistances R 1 and R 2 and the inductances L 1 and L 2 described above, the main current I 1 is converted to a predetermined value,
It is configured to give an operation signal to the drive device 13 when a predetermined current change rate is reached.
【００１１】このような構成の直流遮断器１０によれ
ば、分流導体２を流れる比較的小さな分流電流を直流変
流器４によって検出すれば良いから、直流変流器４を小
型にすることができる。また分流回路にリアクタンスが
可変なインダクタンス素子１を設けて、主回路と分流回
路の抵抗Ｒ1，Ｒ2とリアクタンスＬ1，Ｌ2の比を一致さ
せたため、直流主回路に遮断すべき電流が流れ、それが
図２に示す電流Ａのような過渡電流であっても正確な主
電流Ｉ1 を換算することができ、従来のように図２に示
すような電流変化率の大きな電流Ｃとして誤検出して直
流遮断器１０を誤動作させたり、あるいは遮断すべき電
流であるにも拘らず電流変化率の小さな電流Ｂとして誤
検出して不動作であったりすることを防止して、直流遮
断器としての動作信頼性を向上させることができる。ま
た上述した直流主回路の電流測定装置は、直流遮断器１
０の外側の直流主回路に設けても良いが、上述のように
直流遮断器１０内に組み込んで構成すると、直流遮断器
１０の点検と共に直流主回路の電流測定装置の点検を行
うことができる。According to the DC circuit breaker 10 having such a structure, since the relatively small shunt current flowing through the shunt conductor 2 may be detected by the DC current transformer 4, the DC current transformer 4 can be downsized. it can. In addition, since the inductance element 1 having a variable reactance is provided in the shunt circuit to match the ratios of the resistances R 1 and R 2 of the main circuit and the shunt circuit to the reactances L 1 and L 2 , the current to be interrupted in the DC main circuit is Even if the current is a transient current such as the current A shown in FIG. 2, the accurate main current I 1 can be converted, and as a conventional current C having a large current change rate as shown in FIG. It is possible to prevent the DC circuit breaker 10 from malfunctioning by falsely detecting it, or prevent the DC circuit breaker 10 from malfunctioning due to a current B having a small current change rate even though the current should be interrupted. It is possible to improve the operational reliability as a container. In addition, the above-mentioned DC main circuit current measuring device is a DC circuit breaker 1.
Although it may be provided in the DC main circuit outside 0, if it is constructed by being incorporated in the DC circuit breaker 10 as described above, the DC circuit breaker 10 can be inspected and the current measuring device of the DC main circuit can be inspected. .
【００１２】[0012]
【発明の効果】以上説明したように本発明の直流主回路
の電流測定装置によれば、分流回路にそのリアクタンス
が調整可能なインダクタンス素子を設けたため、測定電
流が過渡電流であっても分流回路に設けた小型の直流変
流器を用いて正確に直流主回路の主電流を換算して得る
ことができる。また上述した直流主回路の電流測定装置
を用いて直流遮断器を構成したため、遮断すべき電流が
過渡電流であっても分流回路に設けた小型の直流変流器
を用いて正確に直流主回路の電流に換算し、これに基い
て正確に対応する動作を行なう信頼性の高い直流遮断器
が得られる。As described above, according to the current measuring device for the DC main circuit of the present invention, since the shunt circuit is provided with the inductance element whose reactance can be adjusted, even if the measured current is a transient current, the shunt circuit is present. It is possible to accurately convert and obtain the main current of the DC main circuit by using the small DC current transformer provided in the. Further, since the DC circuit breaker is configured by using the current measuring device of the DC main circuit described above, even if the current to be interrupted is a transient current, it is possible to accurately use the small DC current transformer provided in the shunt circuit to accurately measure the DC main circuit. It is possible to obtain a highly reliable DC circuit breaker which is converted into the current of (1) and performs an accurate corresponding operation based on this.
【図１】本発明の一実施例による直流主回路の電流測定
装置を示す構成図である。FIG. 1 is a configuration diagram showing a current measuring device for a DC main circuit according to an embodiment of the present invention.
【図２】直流主回路を流れる過渡電流の波形図である。FIG. 2 is a waveform diagram of a transient current flowing through a DC main circuit.
【図３】図１の電気回路図である。3 is an electric circuit diagram of FIG. 1. FIG.
【図４】図１に示すインダクタンス素子の斜視図であ
る。4 is a perspective view of the inductance element shown in FIG. 1. FIG.
【図５】本発明の一実施例による直流遮断器を示す回路
図である。FIG. 5 is a circuit diagram showing a DC circuit breaker according to an embodiment of the present invention.
１ インダクタンス素子 １ａ，１ｂ 鉄心 ２ 分流導体 ３ 主回路導体 ４ 直流変流器 １０ 直流遮断器 １１ 直流遮断器接点 １２ 過電流継電器 1 Inductance element 1a, 1b Iron core 2 Shunt conductor 3 Main circuit conductor 4 DC current transformer 10 DC breaker 11 DC breaker contact 12 Overcurrent relay
フロントページの続き (72)発明者 大内 茂俊 茨城県日立市国分町１丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 久郷 幸雄 茨城県日立市国分町１丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 市川 文久 茨城県日立市国分町１丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 菅野 勉 茨城県日立市国分町１丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 山田 耕也 茨城県日立市国分町１丁目１番１号 株式 会社日立製作所国分工場内Front Page Continuation (72) Inventor Shigenori Ouchi 1-1-1, Kokubuncho, Hitachi City, Ibaraki Hitachi Kokubun Plant, Ltd. (72) Inventor Yukio Kugo 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Stock company Hitachi Kokubun factory (72) Inventor Fumihisa Ichikawa 1-1-1, Kokubun-cho, Hitachi City, Ibaraki Prefecture Stock company Hitachi Kokubun factory (72) Inventor Tsutomu Sugano 1-1, Kokubun-cho, Hitachi City, Ibaraki No. 1 Inside the Kokubun Plant of Hitachi Ltd. (72) Inventor Koya Yamada 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant of Hitachi Ltd.
Claims (6)
接続し、この分流回路に直流変流器を設置して成る直流
主回路の電流測定装置において、上記分流回路にそのリ
アクタンスが可変なインダクタンス素子を設けたことを
特徴とする直流回路の電流測定装置。1. A current measuring device for a DC main circuit, comprising a DC shunt circuit connected in parallel to the DC main circuit and a DC current transformer installed in the shunt circuit, wherein the reactance of the shunt circuit is variable. Current measuring device for a DC circuit, which is provided with various inductance elements.
ダクタンス素子は、上記主回路のリアクタンスと上記分
流回路のリアクタンスの比が、上記主回路の抵抗と上記
分流回路の抵抗の比とほぼ等しくなるようにしたことを
特徴とする直流主回路の電流測定装置。2. The inductance element according to claim 1, wherein the ratio of the reactance of the main circuit and the reactance of the shunt circuit is substantially equal to the ratio of the resistance of the main circuit and the resistance of the shunt circuit. A current measuring device for a DC main circuit characterized by the above.
ダクタンス素子は、二分割されたリング状鉄心の接合面
間の空隙寸法を調整可能に構成したことを特徴とする直
流主回路の電流測定装置。3. The current measuring device for a direct current main circuit according to claim 1, wherein the inductance element is configured to be able to adjust a gap size between joint surfaces of the ring-shaped iron core divided into two. .
ダクタンス素子は、リング状鉄心の軸方向の厚さ寸法を
増減可能に構成したことを特徴とする直流主回路の電流
測定装置。4. The current measuring device for a direct current main circuit according to claim 1, wherein the inductance element is configured to be capable of increasing or decreasing the thickness of the ring-shaped iron core in the axial direction.
上記直流主回路の電流を直流変流器によって検出し、過
電流継電器を介して上記直流遮断器接点に動作指令を与
えるように構成した直流遮断器において、上記直流主回
路の主回路に上記直流遮断器接点を接続し、また上記主
回路に並列に分流回路を接続し、この分流回路に上記直
流変流器と、そのリアクタンスが可変なインダクタンス
素子を設けたことを特徴とする直流遮断器。5. A DC circuit breaker contact is connected to the DC main circuit,
In a DC circuit breaker configured to detect the current of the DC main circuit by a DC current transformer and give an operation command to the DC circuit breaker contact via an overcurrent relay, the DC circuit in the main circuit of the DC main circuit A direct current circuit breaker, characterized in that a circuit breaker contact is connected and a shunt circuit is connected in parallel to the main circuit, and the shunt circuit is provided with the direct current transformer and an inductance element whose reactance is variable.
ダクタンス素子は、上記主回路のリアクタンスと上記分
流回路のリアクタンスの比が、上記主回路の抵抗と上記
分流回路の抵抗の比とほぼ等しくなるようにしたことを
特徴とする直流遮断器。6. The inductor according to claim 5, wherein a ratio of a reactance of the main circuit and a reactance of the shunt circuit is substantially equal to a ratio of a resistance of the main circuit and a resistance of the shunt circuit. A DC circuit breaker characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4189487A JPH0634667A (en) | 1992-07-16 | 1992-07-16 | Measuring device for current of dc main circuit and dc circuit breaker using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4189487A JPH0634667A (en) | 1992-07-16 | 1992-07-16 | Measuring device for current of dc main circuit and dc circuit breaker using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0634667A true JPH0634667A (en) | 1994-02-10 |
Family
ID=16242090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4189487A Pending JPH0634667A (en) | 1992-07-16 | 1992-07-16 | Measuring device for current of dc main circuit and dc circuit breaker using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0634667A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646766A (en) * | 2013-11-14 | 2014-03-19 | 苏州长量电器有限公司 | Ultra-thin large current transformer |
| CN103700476A (en) * | 2013-12-20 | 2014-04-02 | 苏州长量电器有限公司 | Ultrathin large-current transformer |
-
1992
- 1992-07-16 JP JP4189487A patent/JPH0634667A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646766A (en) * | 2013-11-14 | 2014-03-19 | 苏州长量电器有限公司 | Ultra-thin large current transformer |
| CN103700476A (en) * | 2013-12-20 | 2014-04-02 | 苏州长量电器有限公司 | Ultrathin large-current transformer |
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