JP6918609B2 - DC circuit breaker - Google Patents

DC circuit breaker Download PDF

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JP6918609B2
JP6918609B2 JP2017133066A JP2017133066A JP6918609B2 JP 6918609 B2 JP6918609 B2 JP 6918609B2 JP 2017133066 A JP2017133066 A JP 2017133066A JP 2017133066 A JP2017133066 A JP 2017133066A JP 6918609 B2 JP6918609 B2 JP 6918609B2
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current
coil
circuit
limiting reactor
main coil
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JP2019016515A (en
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羽田　正二
正二 羽田
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NTN Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/42—Impedances connected with contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

本発明は、直流電路を流れる電流を遮断する直流遮断器に関する。 The present invention relates to a DC circuit breaker that cuts off a current flowing through a DC electric circuit.

直流電路に短絡事故が発生した場合、直流遮断器を迅速に動作させて電流を遮断しなければならない。このため、短絡が起きたときには直流電路を流れる電流をできる限り早く増加させることが望ましい。
一方、短絡が起きたとき、直流電路にあまりにも大きな短絡電流が流れると、そこに接続されている電気機器や直流遮断器自体が破壊されるおそれがある。このため、直流電路が遮断されるまでの間に短絡電流が大きくなり過ぎないように短絡電流を抑制することが望ましい。 In the event of a short-circuit accident in the DC circuit, the DC circuit breaker must be operated quickly to cut off the current. Therefore, when a short circuit occurs, it is desirable to increase the current flowing through the DC electric circuit as soon as possible.
On the other hand, when a short circuit occurs, if an excessively large short circuit current flows through the DC electric circuit, the electric equipment connected to the short circuit current or the DC circuit breaker itself may be destroyed. Therefore, it is desirable to suppress the short-circuit current so that the short-circuit current does not become too large until the DC electric circuit is cut off.

これらの相反する両方の要求を満たすことができる直流遮断器が知られている（例えば、特許文献１を参照）。この直流遮断器は、電磁式の引外し装置を備えた接点と、限流リアクトルとが直列に接続されている。
引外し装置は、直流電路に流れる電流が所定の電流値を超えると、接点を開く。接点が開くと電流が遮断される。
この限流リアクトルは、主コイルと短絡コイルが共通のコアに巻かれている。主コイルは、直流電路に挿入されている。短絡コイルは、巻線の巻始めと巻終わりとが短絡されている。主コイルと短絡コイルとは電磁結合している。直流電路に短絡事故が起きたとき、この限流リアクトルは、引外し装置によって接点が開かれる所定の電流値付近まで直流電路の電流を迅速に増加させ、その電流値を超えると電流の増加を抑制する。 DC circuit breakers capable of satisfying both of these conflicting requirements are known (see, for example, Patent Document 1). In this DC circuit breaker, a contact equipped with an electromagnetic tripping device and a current limiting reactor are connected in series.
The trip device opens the contacts when the current flowing through the DC electric circuit exceeds a predetermined current value. When the contact opens, the current is cut off.
In this current limiting reactor, the main coil and the short-circuit coil are wound around a common core. The main coil is inserted in the DC electric circuit. In the short-circuit coil, the winding start and winding end are short-circuited. The main coil and the short-circuit coil are electromagnetically coupled. When a short-circuit accident occurs in the DC circuit, this current limiting reactor quickly increases the current in the DC circuit to the vicinity of the predetermined current value at which the contacts are opened by the trip device, and when the current value is exceeded, the current increases. Suppress.

特開２０１６−１８１６８６号公報Japanese Unexamined Patent Publication No. 2016-181686

特許文献１に記載の直流遮断器は、直流電路を流れる電流が徐々に増加した場合でも、所定の電流値を超えると、接点が開いて電流が遮断される。このため、短絡事故ではなく、例えば複数のサーバが同時に起動した場合のように徐々に電流が増加し、一時的に所定の電流値を超えた場合でも、この直流遮断器は電流を遮断する。 In the DC circuit breaker described in Patent Document 1, even when the current flowing through the DC electric circuit gradually increases, when the current value exceeds a predetermined value, the contacts are opened and the current is cut off. Therefore, this DC circuit breaker cuts off the current even when the current gradually increases and temporarily exceeds a predetermined current value, for example, when a plurality of servers are started at the same time, instead of a short-circuit accident.

本発明の目的は、短絡事故のように電流が急激に増加した場合にのみ電流を遮断することができる直流遮断器を提供することである。 An object of the present invention is to provide a DC circuit breaker capable of cutting off a current only when the current suddenly increases as in a short circuit accident.

上記目的を達成するために、本発明の直流遮断器は、
直流電路を開閉する接点（20）と、
前記直流電路に流れる電流を限流する限流リアクトル（10A）と、
前記接点を開く引外しコイルを有する引外し装置（30）と、を備え、
前記限流リアクトルが、
磁束を通しやすい材料で作られたコア（13）と、
前記接点（20）と直列に接続され、前記直流電路の電流が流れかつ前記コア（13）に巻かれた主コイル（11）と、
前記主コイル（11）と絶縁されかつ前記主コイルに重ね巻きされて電磁結合している副コイル（12）と、を有し、
前記主コイル（11）に流れる電流の変化率に応じて前記副コイル（12）に電流が流れ、前記副コイル（12）に生じた電流が前記引外しコイルに流れ、前記引外しコイルに流れる電流が所定の値を超えたときに前記接点（20）が開かれることを特徴とする。 In order to achieve the above object, the DC circuit breaker of the present invention
The contact (20) that opens and closes the DC electric circuit,
A current limiting reactor (10A) that limits the current flowing through the DC electric circuit, and
E Bei a trip unit having a trip coil opens the previous SL contacts (30), a
The current limiting reactor
A core (13) made of a material that easily allows magnetic flux to pass through,
A main coil (11) connected in series with the contact (20), through which a current of the DC electric circuit flows and wound around the core (13),
It has an auxiliary coil (12) that is insulated from the main coil (11) and electromagnetically coupled to the main coil.
A current flows through the sub-coil (12) according to the rate of change of the current flowing through the main coil (11), and the current generated in the sub-coil (12) flows through the trip coil and flows through the trip coil. The contact (20) is opened when the current exceeds a predetermined value .

好ましくは、本発明の直流遮断器は、
前記限流リアクトルが、巻線の巻始めと巻終わりとが短絡されており、前記主コイルと電磁結合している短絡コイルを備えることを特徴とする。 Preferably, the DC circuit breaker of the present invention
The current limiting reactor is characterized by including a short-circuit coil in which the winding start and winding end of the winding are short-circuited and electromagnetically coupled to the main coil.

本発明によれば、短絡事故のように電流が急激に増加した場合にのみ電流を遮断することができる。 According to the present invention, the current can be cut off only when the current suddenly increases as in a short circuit accident.

本発明の第１の実施形態に係る直流遮断器の構成の一例を示す図である。It is a figure which shows an example of the structure of the DC circuit breaker which concerns on 1st Embodiment of this invention. 図１の直流遮断器に含まれる限流リアクトルの磁気回路の構成の一例を示す図である。It is a figure which shows an example of the structure of the magnetic circuit of the current limiting reactor included in the DC circuit breaker of FIG. 本発明の第２の実施形態に係る直流遮断器の構成の一例を示す図である。It is a figure which shows an example of the structure of the DC circuit breaker which concerns on 2nd Embodiment of this invention. 図３の直流遮断器に含まれる限流リアクトルの磁気回路の構成の一例を示す図である。It is a figure which shows an example of the structure of the magnetic circuit of the current limiting reactor included in the DC circuit breaker of FIG. 大きな電圧が印加されたとき、限流リアクトルの主コイルに流れる電流の時間経過の一例を示す図である。It is a figure which shows an example of the time passage of the current flowing through the main coil of a current limiting reactor when a large voltage is applied.

以下、本発明の実施形態に係る直流遮断器について図面を参照しながら詳細に説明する。なお、実施形態を説明する全図において、共通の構成要素には同一の符号を付し、繰り返しの説明を省略する。 Hereinafter, the DC circuit breaker according to the embodiment of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, the common components are designated by the same reference numerals, and the repeated description will be omitted.

図１は、本発明の第１の実施形態に係る直流遮断器１の構成の一例を示す。
直流遮断器１は、限流リアクトル１０Ａと、接点２０と、引外し装置３０と、ダイオードＤ１とを有する。
端子Ｔ１と端子Ｔ２の間に、端子Ｔ１と端子Ｔ２をそれぞれ正側と負側として直流電圧（例えば３８０Ｖ）が印加される。端子Ｔ３と端子Ｔ４の間には負荷が接続される。
端子Ｔ１と端子Ｔ３の間は直流電路の一部を形成する。限流リアクトル１０Ａと接点２０とは、端子Ｔ１と端子Ｔ３との間に直列に挿入される。 FIG. 1 shows an example of the configuration of the DC circuit breaker 1 according to the first embodiment of the present invention.
The DC circuit breaker 1 has a current limiting reactor 10A, a contact 20, a trip device 30, and a diode D1.
A DC voltage (for example, 380V) is applied between the terminal T1 and the terminal T2 with the terminal T1 and the terminal T2 as the positive side and the negative side, respectively. A load is connected between the terminal T3 and the terminal T4.
A part of a DC electric circuit is formed between the terminal T1 and the terminal T3. The current limiting reactor 10A and the contact 20 are inserted in series between the terminal T1 and the terminal T3.

接点２０は、一端が端子Ｔ１に接続される。接点２０は、直流電路を開閉する。
限流リアクトル１０Ａは、主コイル１１と、副コイル１２とを有する。本実施形態では、主コイル１１は一端Ａが接点２０の他端に接続され、他端Ｂが端子Ｔ３に接続される。主コイル１１には直流電路の電流が流れる。主コイル１１は、直流電路に流れる電流を限流する。すなわち、主コイル１１は、正常時はほとんど損失無く電流を流すが、電流が急激に増加したとき、この電流の増加を抑制する。 One end of the contact 20 is connected to the terminal T1. The contact 20 opens and closes the DC electric circuit.
The current limiting reactor 10A has a main coil 11 and a sub coil 12. In the present embodiment, one end A of the main coil 11 is connected to the other end of the contact 20, and the other end B is connected to the terminal T3. A DC electric circuit current flows through the main coil 11. The main coil 11 limits the current flowing through the DC electric circuit. That is, the main coil 11 normally flows a current with almost no loss, but when the current suddenly increases, the increase in the current is suppressed.

副コイル１２は、主コイル１１と電磁結合している。主コイル１１に流れる電流が変化すると、相互誘導により主コイル１１の電流の変化に応じた電流（すなわち、直流電路に流れる電流の変化率に応じた電流）が副コイル１２に生じる。
引外し装置３０は、例えば引外しコイルを有する。引外しコイルの一端と他端は、副コイル１２の一端Ｃと他端Ｄにそれぞれ接続されている。引外しコイルには副コイル１２に生じた電流が流れる。引外しコイルはその電流によって生じる磁力によりその電流が所定の値を超えたときに接点２０を開く。従って、引外し装置３０は、直流電路に流れる電流の変化率が所定の大きさを超えたときに接点２０を開く。
ダイオードＤ１は、アノードとカソードがそれぞれ主コイル１１の他端Ｂ（端子Ｔ３側）と一端Ａ（接点２０側）に接続される。接点２０が開くと、主コイル１１は逆起電力を生じる。ダイオードＤ１は、主コイル１１とダイオードＤ１で形成される閉回路で逆起電力によって生じる電流をループさせる。 The sub coil 12 is electromagnetically coupled to the main coil 11. When the current flowing through the main coil 11 changes, a current corresponding to the change in the current of the main coil 11 (that is, a current corresponding to the rate of change of the current flowing through the DC electric path) is generated in the sub coil 12 by mutual induction.
The trip device 30 has, for example, a trip coil. One end and the other end of the trip coil are connected to one end C and the other end D of the sub coil 12, respectively. The current generated in the sub coil 12 flows through the trip coil. The trip coil opens the contact 20 when the current exceeds a predetermined value due to the magnetic force generated by the current. Therefore, the trip device 30 opens the contact 20 when the rate of change of the current flowing in the DC electric circuit exceeds a predetermined magnitude.
In the diode D1, the anode and cathode are connected to the other end B (terminal T3 side) and one end A (contact 20 side) of the main coil 11, respectively. When the contact 20 is opened, the main coil 11 generates a counter electromotive force. The diode D1 loops the current generated by the counter electromotive force in a closed circuit formed by the main coil 11 and the diode D1.

図２は、図１の直流遮断器１に含まれる限流リアクトル１０Ａの磁気回路の構成の一例を示す。
限流リアクトル１０Ａは、コア１３を持つ。コア１３は、ヨークＹ１と、ヨークＹ２と、脚部Ｐ１と、脚部Ｐ２とを有する。ヨークＹ１とヨークＹ２は対向している。脚部Ｐ１は、ヨークＹ１の左の端部とヨークＹ２の左の端部を連結する。脚部Ｐ２は、ヨークＹ１の右の端部とヨークＹ２の右の端部を連結する。
主コイル１１と副コイル１２は、それぞれ脚部Ｐ１と脚部Ｐ２に巻かれている。なお、主コイル１１と副コイル１２は、脚部Ｐ１と脚部Ｐ２のいずれか一方に重ね巻きされていてもよい。 FIG. 2 shows an example of the configuration of the magnetic circuit of the current limiting reactor 10A included in the DC circuit breaker 1 of FIG.
The current limiting reactor 10A has a core 13. The core 13 has a yoke Y1, a yoke Y2, a leg portion P1, and a leg portion P2. York Y1 and York Y2 face each other. The leg P1 connects the left end of the yoke Y1 and the left end of the yoke Y2. The leg P2 connects the right end of the yoke Y1 and the right end of the yoke Y2.
The main coil 11 and the sub coil 12 are wound around the leg P1 and the leg P2, respectively. The main coil 11 and the sub coil 12 may be wound over one of the leg portion P1 and the leg portion P2.

コア１３は、鉄のような磁束を通しやすい材料で作られている。ただし、コア１３は、磁束を通しやすい材料であれば、鉄以外の材料で作られていてもよい。
コア１３は１つ以上のギャップ（隙間）を有していてもよい。コア１３にギャップがあると、漏れ磁束が増加し、コア１３は磁気飽和しにくくなる。 The core 13 is made of a material such as iron that easily allows magnetic flux to pass through. However, the core 13 may be made of a material other than iron as long as it is a material through which magnetic flux can easily pass.
The core 13 may have one or more gaps. If there is a gap in the core 13, the leakage flux increases, and the core 13 is less likely to be magnetically saturated.

図３は、本発明の第２の実施形態に係る直流遮断器２の構成の一例を示す。図４は、図３の直流遮断器２に含まれる限流リアクトル１０Ｂの磁気回路の構成の一例を示す。
直流遮断器２は、限流リアクトル１０Ｂの構成が第１の実施形態に係る限流リアクトル１０Ａと異なる。それ以外の点では、第２の実施形態に係る直流遮断器２は、第１の実施形態に係る直流遮断器１と同一である。
限流リアクトル１０Ｂは、主コイル１１と、副コイル１２と、コア１３と、短絡コイル１４とを有する。
コア１３は、図２の第１の実施形態に係るコア１３と同一である。限流リアクトル１０Ｂは、主コイル１１と副コイル１２がコア１３に重ね巻きされている点、および短絡コイル１４を有する点が第１の実施形態に係る限流リアクトル１０Ａと異なる。
短絡コイル１４は、巻線の巻始めと巻終わりとが短絡されている。主コイル１１と短絡コイル１４とは電磁結合している。 FIG. 3 shows an example of the configuration of the DC circuit breaker 2 according to the second embodiment of the present invention. FIG. 4 shows an example of the configuration of the magnetic circuit of the current limiting reactor 10B included in the DC circuit breaker 2 of FIG.
The DC circuit breaker 2 has a configuration of the current limiting reactor 10B different from that of the current limiting reactor 10A according to the first embodiment. In other respects, the DC circuit breaker 2 according to the second embodiment is the same as the DC circuit breaker 1 according to the first embodiment.
The current limiting reactor 10B has a main coil 11, a sub coil 12, a core 13, and a short-circuit coil 14.
The core 13 is the same as the core 13 according to the first embodiment of FIG. The current limiting reactor 10B is different from the current limiting reactor 10A according to the first embodiment in that the main coil 11 and the sub coil 12 are superposed on the core 13 and that the short-circuit coil 14 is provided.
In the short-circuit coil 14, the winding start and winding end of the winding are short-circuited. The main coil 11 and the short-circuit coil 14 are electromagnetically coupled.

図５は、大きな電圧が印加されたとき、限流リアクトル１０Ａと限流リアクトル１０Ｂの主コイル１１に流れる電流の時間経過の一例を示す。
限流リアクトル１０Ａでは、電流が徐々に増加する。限流リアクトル１０Ａは、時間が経過すると、コア１３が磁気飽和し、過大な電流が流れる。このため、直流遮断器１は、引外し装置３０の動作が遅いと、直流電路に過大な電流が流れるおそれがある。
一方、限流リアクトル１０Ｂでは、初期に急速に電流が増加するが、ある電流値を超えると電流の増加が抑制される。従って、直流電路に短絡事故が起きたとき、直流遮断器２の引外し装置３０は、事故直後に急速に増加する電流に応答して接点２０を開くことができる。そして、直流遮断器２は引外し装置３０の動作が遅くても直流電路に過大な電流が流れることはない。
また、副コイル１２を主コイル１１の上に重ね巻きすることにより、副コイル１２は主コイル１１に流れる電流の変化に応じてより効率的に電流を生じさせることができる。 FIG. 5 shows an example of the passage of time of the current flowing through the main coil 11 of the current limiting reactor 10A and the current limiting reactor 10B when a large voltage is applied.
In the current limiting reactor 10A, the current gradually increases. In the current limiting reactor 10A, the core 13 is magnetically saturated with the passage of time, and an excessive current flows. Therefore, in the DC circuit breaker 1, if the trip device 30 operates slowly, an excessive current may flow in the DC electric circuit.
On the other hand, in the current limiting reactor 10B, the current increases rapidly at the initial stage, but when the current value exceeds a certain value, the increase in the current is suppressed. Therefore, when a short-circuit accident occurs in the DC electric circuit, the trip device 30 of the DC circuit breaker 2 can open the contact 20 in response to the rapidly increasing current immediately after the accident. The DC circuit breaker 2 does not allow an excessive current to flow in the DC electric circuit even if the trip device 30 operates slowly.
Further, by winding the sub coil 12 on the main coil 11, the sub coil 12 can generate a current more efficiently according to a change in the current flowing through the main coil 11.

なお、上述した実施形態では、限流リアクトル１０Ａと限流リアクトル１０Ｂを示したが、これらは例示であって限定するものではない。これら以外にも様々な構成の限流リアクトルを用いて本発明を実施することができる。また、矩形状のコア１３を示したが、これに限らず、コア１３として、環状のコア、ＥＩコア、ＥＥコア、ＵＵコア等の様々な形状のものを用いて本発明を実施することができる。 In the above-described embodiment, the current limiting reactor 10A and the limiting current reactor 10B are shown, but these are examples and are not limited. In addition to these, the present invention can be carried out using current limiting reactors having various configurations. Further, although the rectangular core 13 is shown, the present invention is not limited to this, and the present invention can be carried out using various shapes such as an annular core, an EI core, an EE core, and a UU core as the core 13. can.

また、上述した実施形態では、直流遮断器１，２を直流給電線の正側に挿入する例を示したが、直流遮断器１，２を直流給電線の負側、または正側と負側の両方に挿入することもできる。 Further, in the above-described embodiment, an example in which the DC circuit breakers 1 and 2 are inserted on the positive side of the DC feeder line is shown, but the DC circuit breakers 1 and 2 are on the negative side of the DC feeder line, or on the positive side and the negative side. It can also be inserted in both.

以上説明したように、本発明によれば、短絡事故のように電流が急激に増加した場合にのみ電流を遮断することができる。 As described above, according to the present invention, the current can be cut off only when the current suddenly increases as in a short circuit accident.

以上、本発明の実施形態について説明したが、設計または製造上の都合やその他の要因によって必要となる様々な修正や組み合わせは、請求項に記載されている発明や発明の実施形態に記載されている具体例に対応する発明の範囲に含まれる。 Although the embodiments of the present invention have been described above, various modifications and combinations required due to design or manufacturing convenience and other factors are described in the inventions and embodiments of the invention described in the claims. It is included in the scope of the invention corresponding to the specific example.

１，２…直流遮断器、１０Ａ，１０Ｂ…限流リアクトル、１１…主コイル、１２…副コイル、１３…コア、１４…短絡コイル、２０…接点、３０…引外し装置、Ｄ１，Ｄ２…ダイオード 1,2 ... DC circuit breaker, 10A, 10B ... Current limiting reactor, 11 ... Main coil, 12 ... Sub coil, 13 ... Core, 14 ... Short circuit coil, 20 ... Contact, 30 ... Trip device, D1, D2 ... Diode

Claims (2)

直流電路を開閉する接点（20）と、
前記直流電路に流れる電流を限流する限流リアクトル（10A）と、
前記接点を開く引外しコイルを有する引外し装置（30）と、を備え、
前記限流リアクトルが、
磁束を通しやすい材料で作られたコア（13）と、
前記接点（20）と直列に接続され、前記直流電路の電流が流れかつ前記コア（13）に巻かれた主コイル（11）と、
前記主コイル（11）と絶縁されかつ前記主コイルに重ね巻きされて電磁結合している副コイル（12）と、を有し、
前記主コイル（11）に流れる電流の変化率に応じて前記副コイル（12）に電流が流れ、前記副コイル（12）に生じた電流が前記引外しコイルに流れ、前記引外しコイルに流れる電流が所定の値を超えたときに前記接点（20）が開かれることを特徴とする直流遮断器。 The contact (20) that opens and closes the DC electric circuit,
A current limiting reactor (10A) that limits the current flowing through the DC electric circuit, and
E Bei a trip unit having a trip coil opens the previous SL contacts (30), a
The current limiting reactor
A core (13) made of a material that easily allows magnetic flux to pass through,
A main coil (11) connected in series with the contact (20), through which a current of the DC electric circuit flows and wound around the core (13),
It has an auxiliary coil (12) that is insulated from the main coil (11) and electromagnetically coupled to the main coil.
A current flows through the sub-coil (12) according to the rate of change of the current flowing through the main coil (11), and the current generated in the sub-coil (12) flows through the trip coil and flows through the trip coil. A DC breaker characterized in that the contact (20) is opened when a current exceeds a predetermined value. 前記限流リアクトルが、巻線の巻始めと巻終わりとが短絡されており、前記主コイルと電磁結合している短絡コイルを備えることを特徴とする請求項１に記載の直流遮断器。 The DC circuit breaker according to claim 1 , wherein the current limiting reactor includes a short-circuit coil in which the winding start and winding end of the winding are short-circuited and electromagnetically coupled to the main coil.
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