JPS6086727A - Fuse box for preventing 3-phase 3-wired defect phase - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は三相三線式の配電線から引込み幹線を分岐する
個所に設置するヒユーズボックスに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuse box installed at a location where a main lead line branches from a three-phase, three-wire power distribution line.

引込幹線において、過負荷あるいは短絡等が生じて三相
の電圧側電線の一本に設けたヒユーズが溶断した場合、
そのままの状態にしておくと、例えば三相電動機を運転
している場合には、その三相電動機が単相で運転される
結果、過電流によって焼損する恐れがある。If an overload or short circuit occurs on the lead-in main line and the fuse installed in one of the three-phase voltage side wires melts,
If left in this state, for example, if a three-phase motor is being operated, the three-phase motor will be operated in a single phase, and as a result, there is a risk of burnout due to overcurrent.

本発明の目的は、このような三相三線式の欠相による電
気機器の損傷を有効に防止し得るよう適切に構成したヒ
ユーズボックス全提供しようとするものである。An object of the present invention is to provide a fuse box suitably configured to effectively prevent damage to electrical equipment caused by such a three-phase, three-wire system open phase.

本発明の三相三線式欠相防止用ヒユーズボックスは、三
相の電圧側電線の各々に介挿されるヒユーズと並列に接
続され、ヒユーズの溶断により作動するヒユーズ溶断検
知コイルと、これらヒューズ溶断検知コイルの各々に直
列に接続して設け７で常閉接点と、互いに異なる二相の
電圧側電線間にそれぞれ設けた常開接点と、前記各々の
ヒユーズ溶断検知コイルの作動により対応する前記常閉
接点および異なる二相の電圧側電線間に接続され穴前記
常開接点全連動してそれぞれ開放および閉成する連動機
構と、各相に対応する前記常閉接点の開放状態およびこ
れと対応する前記常開接点の閉成状態をそれぞれ独立し
て機械的に保持する保持機構と、これら保持機構による
前記常開接点の開放状態および前記常開接点の閉成状態
全選択的に解除するリセット機構と金具えることを特徴
とするものである。The three-phase three-wire type fuse box for preventing phase loss of the present invention includes a fuse blowout detection coil that is connected in parallel with the fuses inserted in each of the voltage side electric wires of the three phases and is activated when the fuse blows out, and a fuse blowout detection coil that detects these fuse blowouts. A normally closed contact 7 is connected in series with each of the coils, a normally open contact is provided between the voltage side wires of two different phases, and a corresponding normally closed contact is provided by the operation of each of the fuse blowing detection coils. an interlocking mechanism connected between the contacts and the voltage side wires of different two phases and opening and closing the normally open contacts in conjunction with each other, and the open state of the normally closed contacts corresponding to each phase and the corresponding a holding mechanism that mechanically maintains the closed state of each normally open contact independently; and a reset mechanism that selectively releases all of the open state of the normally open contact and the closed state of the normally open contact by these holding mechanisms; It is characterized by metal fittings.

以下図面を参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.

第１図は本発明の三相三線式欠相防止用ヒユーズボック
スの一例の回路構成図である。本例では、電源側のＵ、
Ｖ、Ｗ相の電圧側電線１，２．８と、負荷側のＲ，Ｓ、
Ｔ相の電圧側電線１’　、　２’　、　８’とのそれぞ
れの間に介挿されるヒユーズ４Ｕ、　４Ｖ、　＋Ｗと並
列に、ヒユーズ溶断検知コイル５Ｕ、　５Ｖ。FIG. 1 is a circuit configuration diagram of an example of a three-phase, three-wire fuse box for preventing phase loss according to the present invention. In this example, U on the power supply side,
V, W phase voltage side electric wires 1, 2.8, load side R, S,
Fuse blowout detection coils 5U, 5V are installed in parallel with the fuses 4U, 4V, +W inserted between the T-phase voltage side electric wires 1', 2', 8', respectively.

５Ｗと、常閉接点６Ｕ、６Ｖ、６Ｗとをそれぞれ直列に
接続する。また、Ｒ，Ｓ、’Ｉ’相の電圧側電線１’　
、　２’　、　８’の各相間には、それぞれ限流抵抗７
　Ｒ８゜７ＳＴお工び７ＴＲを介して常閉接点８Ｒ８，
８ＳＴお工び８ＴＲｇ接続する。本例では、常閉接点６
Ｕと常開接点８ＳＴ、常閉接点６ｖと常開接点８　ＴＲ
。5W and normally closed contacts 6U, 6V, and 6W are connected in series, respectively. In addition, R, S, 'I' phase voltage side electric wire 1'
, 2', and 8', there is a current limiting resistor 7 between each phase.
Normally closed contact 8R8, via R8゜7ST and 7TR
Connect 8ST and 8TRg. In this example, normally closed contact 6
U and normally open contact 8ST, normally closed contact 6V and normally open contact 8 TR
.

および常閉接点６Ｗと常開接点８Ｒ８と全それぞれ対応
させ、ヒユーズ４Ｕが溶断したときにヒユーズ溶断検知
コイル５Ｕおよび常閉接点６Ｕの直列回路に流れる電流
によってヒユーズ溶断検知コイル５Ｕに発生する磁力に
より、常閉接点６Ｕおよびこれと対応する常開接点ＳＳ
Ｔ全連動機構を介してそれぞれ開放および閉成させる。The normally closed contact 6W and the normally open contact 8R8 correspond to each other, and when the fuse 4U blows, the magnetic force generated in the fuse blow detection coil 5U by the current flowing through the series circuit of the fuse blow detection coil 5U and the normally closed contact 6U. , normally closed contact 6U and corresponding normally open contact SS
They are opened and closed respectively through the T-all interlocking mechanism.

同様に、ヒユーズ４■が溶断したときは、その溶断下に
おいテヒューズ溶断検知コイル５ｖおよび常閉接点６ｖ
の直列回路に流れる電流によりヒユーズ溶断検知コイル
５■に発生する磁力によって、常閉接点６ｖおよびこれ
と対応する常開接点８ＴＲを連動機構を介してそれぞれ
開放および閉成される。Similarly, when the fuse 4■ is blown, the fuse blown detection coil 5v and the normally closed contact 6v are placed under the blown fuse.
The normally closed contact 6v and the corresponding normally open contact 8TR are opened and closed, respectively, by the magnetic force generated in the fuse blowing detection coil 52 by the current flowing through the series circuit of the fuse blowing detection coil 51 through the interlocking mechanism.

また、ヒユーズ４Ｗが溶断したときは、その溶断下にお
いてヒユーズ溶断検知コイル５Ｗおよび常閉接点６Ｗの
直列回路に流れる電流によりヒユーズ溶断検知コイル５
Ｗに発生する磁力によって、常閉接点６Ｗおよびこれと
対応する常開接点ＳＲ８を連動機構金倉してそれぞれ開
放および閉成させる。なお、各相において、ヒユーズが
有効に接続されている正常状態下においては、ヒユーズ
溶断検知コイルおよび常閉接点の直列回路には殆んど電
流が流れず、その常閉接点およびこれと対応する常開接
点の閉成状態および開放状態はそれぞれ有効に維持され
るようにする。In addition, when the fuse 4W is blown, the fuse blown detection coil 5 is caused by the current flowing through the series circuit of the fuse blown detection coil 5W and the normally closed contact 6W under the blown state.
The magnetic force generated in W causes the normally closed contact 6W and the corresponding normally open contact SR8 to open and close, respectively, through an interlocking mechanism. In each phase, under normal conditions when the fuse is effectively connected, almost no current flows through the series circuit of the fuse blown detection coil and the normally closed contact. The closed and open states of the normally open contacts are respectively maintained effectively.

このようにして、例えばヒユーズ４Ｕが溶断したときは
、ヒユーズ溶断検知コイル５Ｕによって常開接点８ＳＴ
ｉ閉成しこれによりＳＴ相聞全強制的に短絡してヒユー
ズ４ｖお工び／または４Ｗを溶断する。すなわち、三相
のうちのおる相のヒユーズが溶断したら、直ちに他の一
相あるいは二相のヒユーズを自動的に溶断して欠相を防
止する。In this way, for example, when the fuse 4U is blown, the normally open contact 8ST is activated by the fuse blown detection coil 5U.
i is closed, thereby forcibly shorting the ST phase and blowing out the fuse 4V and/or 4W. That is, when the fuse of one of the three phases is blown, the fuses of the other one or two phases are immediately blown to prevent an open phase.

本発明においては、常開接点の閉成による他の相のヒユ
ーズの溶断を確実に行なうと共に、溶断後のヒユーズの
取付は作業全容易かつ安全に行ない得るようにするため
、各相において連動機構による常閉接点の開放状態およ
びこれと対応する常開接点の閉成状態をそれぞれ独立し
た保持機構によって機械的に保持すると共に、その各保
持機構による常閉接点の開放状態および常開接点の閉成
状態をリセット機構によって選択的に解除するようにす
る。このようにして、ヒユーズの溶断後、常開接点の閉
成状態金鱗除した状態でヒユーズの取付は作業を行ない
、その取付は完了後金ての常閉接点の開放状態を解除し
て正常状態に復帰できるようにする。In the present invention, in order to ensure that the fuses of other phases are blown by closing the normally open contacts, and to ensure that the fuses can be installed easily and safely after being blown, an interlocking mechanism is provided for each phase. The open state of a normally-closed contact and the corresponding closed state of a normally-open contact are mechanically held by independent holding mechanisms, and the open state of a normally-closed contact and the closed state of a normally-open contact are held by each holding mechanism. The established state is selectively canceled by a reset mechanism. In this way, after the fuse is blown, the fuse installation work is carried out with the normally open contacts in the closed state and the metal scales are removed, and after the installation is completed, the normally closed contacts are released from the open state and normal operation is completed. Allow the state to return to normal.

以下、各相における連動機構、保持機構およびリセット
機構の一例の構成を第２図を参照して説明する。なお、
第２図はＵ相のみの構成１を示すが、他の相についても
同様に構成する。Hereinafter, the configuration of an example of the interlocking mechanism, holding mechanism, and reset mechanism in each phase will be explained with reference to FIG. 2. In addition,
Although FIG. 2 shows the configuration 1 for only the U phase, the other phases are similarly configured.

ヒユーズ溶断検知コイル５Ｕは鉄芯１１に巻装し、この
鉄芯１１に接離可能に可動鉄片１２ｉ設ける。この可動
鉄片１２は固定部材に回動可能に支持し、一端部１２ａ
′ｆｒ鉄芯１１に接離させ、他端部１２ｂはスライド可
能に設けた絶縁性の可動軸１８に形成した係止部１３ａ
に選択的に係合させるようにして、ばね１４に工り一端
部１２ａが鉄芯〕１から離間する方向、すなわち他端部
１２ｂが可動軸１Ｂの係止部１８ａに係合する方向に附
勢し、ヒユーズ４Ｕが有効に接続されている状態では、
一端部１２ａが鉄芯１１から離間し、他端部１２ｂが係
止部１ｓａに保合するよう構成する。The fuse blowout detection coil 5U is wound around an iron core 11, and a movable iron piece 12i is provided on the iron core 11 so as to be able to come into contact with and separate from it. This movable iron piece 12 is rotatably supported by a fixed member, and has one end 12a.
'fr A locking portion 13a is formed on an insulating movable shaft 18 which is brought into contact with and separated from the iron core 11, and whose other end portion 12b is slidably provided.
The spring 14 is machined so that the one end 12a is attached in the direction away from the iron core 1, that is, in the direction in which the other end 12b is engaged with the locking part 18a of the movable shaft 1B. and when fuse 4U is connected effectively,
One end portion 12a is spaced apart from the iron core 11, and the other end portion 12b is configured to be held in the locking portion 1sa.

可！ｌ！ＩＩ＠ｌｓの一端部には、ストッパＩＥｌｂ’
ｉｉ設けて常開接点８ＳＴｅ構成する可動接片８ＳＴ　
−１を遊嵌すると共に、この可動接片８ＳＴ−１と可動
軸１８の移動を案内するガイド部材１５との間に、常開
接点８ＳＴの閉成下において、その可動接片８ＳＴ−１
全接点８ＳＴ−ｇ、８ＳＴ−８に所定の接触圧で接触さ
せるための絶縁性の接点ばね１６を設け、他端部にはス
ライド方向に延在して連動環ｌｔｌを形成する。この可
動軸ｌＢは一端部に遊嵌した可動接片８ＳＴ−１が接点
８ＳＴ−２゜８ＳＴ−８に接触する方向にばね１７にＪ
ニジ附勢する。Possible! l! At one end of II@ls, there is a stopper IElb'
ii is provided with a movable contact piece 8ST constituting a normally open contact 8STe.
-1 is loosely fitted between the movable contact piece 8ST-1 and the guide member 15 that guides the movement of the movable shaft 18, with the normally open contact 8ST closed.
An insulating contact spring 16 is provided for contacting all the contacts 8ST-g and 8ST-8 with a predetermined contact pressure, and an interlocking ring ltl is formed at the other end extending in the sliding direction. This movable shaft 1B is rotated by a spring 17 in the direction in which the movable contact piece 8ST-1 loosely fitted to one end contacts the contact 8ST-2°8ST-8.
Reinforce Niji.

一方、常閉接点６Ｕｉ構成する可動接片６Ｕ−１は、常
開接点８ＳＴの可動＠１８と同一方向にスライド可能に
設けた絶縁性の可動軸１８の一端に固定する。この可動
軸１８は、絶縁性の接点ばね１９により可動接片６Ｕ−
１が接点６Ｕ−２゜６　Ｕ　−３に所定の接触圧で接触
するように附勢すると共に、常閉接点６Ｕの開放と常開
接点８ＳＴの閉成と全連動して行なうために、常開接点
８ＳＴの可動軸１Ｂの他端部に形成した連動環１１３０
に連結ビン１８ａ’ｉ介して係合させる。On the other hand, the movable contact piece 6U-1 constituting the normally closed contact 6Ui is fixed to one end of an insulating movable shaft 18 provided so as to be slidable in the same direction as the movable @18 of the normally open contact 8ST. This movable shaft 18 is connected to the movable contact piece 6U- by an insulating contact spring 19.
1 is energized so that it contacts the contact 6U-2゜6U-3 with a predetermined contact pressure, and in order to do this in full conjunction with the opening of the normally closed contact 6U and the closing of the normally open contact 8ST. Interlocking ring 1130 formed at the other end of the movable shaft 1B of the open contact 8ST
through the connecting pin 18a'i.

すなわち、本例ではヒユーズ４Ｕの溶断に、１１）、可
動鉄片１２にばね１４の力に抗して回動させて、その一
端部１２ａ全ヒユーズ溶断検知コイル５Ｕの鉄芯１１に
吸引接線させると共に、他端部１２ｂ全可動軸１８の係
止部１１３ａから離間させてその保合を解除し、これに
エリ可動軸１８をばね１７の力によりスライドさせて常
開接点８ＳＴの可動接片８ＳＴ−１を接点ばね１６によ
り所定の接触圧で接点８ＳＴ−２，８ＳＴ−１３に接触
させると共に、この常開接点８ＳＴが閉成してから若干
遅れて可動軸１Ｂのスライドにエリ連結ビンｌ５ａｙ介
して常閉接点６Ｕの可動軸１８葡接点ばね１９の力に抗
してスライドさせて、常閉接点６Ｕの可動接片０Ｕ−１
’（ｉ＝接点６Ｕ−２，６Ｕ−３から離間させるように
、常閉接点６Ｕおよび常開接点８ＳＴ全それぞれ開放お
よび閉成する連動機構を構成する。このように、連動機
構を、常開接点８ＳＴの閉成後若干遅れて常閉接点６Ｕ
が開放するように構成すれば、ヒユーズ溶断検知コイル
５Ｕの作動による可動鉄片１２の他端部１２ｂと可動軸
１８の係止部１８ａとの係合を確実に解除することがで
きる。That is, in this example, in order to blow out the fuse 4U, 11), the movable iron piece 12 is rotated against the force of the spring 14, and one end 12a thereof is made to attract and tangent to the iron core 11 of the entire fuse blowout detection coil 5U. , the other end 12b is separated from the locking part 113a of the fully movable shaft 18 to release its locking, and the fully movable shaft 18 is slid by the force of the spring 17 to open the movable contact piece 8ST- of the normally open contact 8ST. 1 is brought into contact with the contacts 8ST-2 and 8ST-13 with a predetermined contact pressure by the contact spring 16, and after a slight delay after the normally open contact 8ST is closed, the contact is brought into contact with the slide of the movable shaft 1B via the connecting pin 15ay. The movable shaft 18 of the normally closed contact 6U is slid against the force of the contact spring 19 to open the movable contact piece 0U-1 of the normally closed contact 6U.
'(i=An interlocking mechanism is constructed that opens and closes all of the normally closed contact 6U and normally open contact 8ST, respectively, so that they are spaced apart from the contacts 6U-2 and 6U-3. In this way, the interlocking mechanism is After a slight delay after contact 8ST closes, normally closed contact 6U closes.
If configured to open, the engagement between the other end 12b of the movable iron piece 12 and the locking portion 18a of the movable shaft 18 due to the operation of the fuse blowout detection coil 5U can be reliably released.

ヒユーズ溶断検知コイル５Ｕの作動による常開接点８Ｓ
Ｔの閉成状態は、可動接片８ＳＴ−１と可動軸１８のガ
イド部材１５との間で、可動軸１８に巻装したばね１６
によって保持する。Normally open contact 8S due to operation of fuse blowout detection coil 5U
In the closed state of T, the spring 16 wound around the movable shaft 18 is connected between the movable contact piece 8ST-1 and the guide member 15 of the movable shaft 18.
held by.

−１だ、常閉接点６Ｕの開放状態を保持するため、その
可動軸１８に係止部１８ｂｉ形成すると共に、この係止
部１８ｂＫ選択的に係合するように係止レバー２０を設
ける。この係止し、＜−２０は固定部材に回動可能に支
持し、一端部２０　ａ　ｆ（可動軸１８の係止部１８ｂ
に選択的に係合させるようにして、ばね２１により一端
部２０ａが可動軸１８の係止部１８ｂＫ係合する方向に
附勢する。このようにして、ヒユーズ溶断検知コイル５
Ｕの作動による可動軸１８のスライドに応動して、ばね
２１により係止レバー２０を回動させてその一端部２０
ａ’ｉ可動軸１８の係止部１８ｂに係合させることによ
り、その保合状態すなわち常閉接点６Ｕの開放状態を接
点はね１９と協働して保持する。-1, in order to maintain the open state of the normally closed contact 6U, a locking portion 18bi is formed on the movable shaft 18, and a locking lever 20 is provided so as to selectively engage the locking portion 18bK. This locking <-20 is rotatably supported by a fixed member, and one end 20 a f (locking part 18 b of the movable shaft 18
The spring 21 urges the one end 20a in a direction to engage the locking portion 18bK of the movable shaft 18 selectively. In this way, the fuse blowout detection coil 5
In response to the sliding of the movable shaft 18 due to the operation of U, the locking lever 20 is rotated by the spring 21, and one end 20 of the locking lever 20 is rotated by the spring 21.
By engaging with the locking portion 18b of the a'i movable shaft 18, the retained state, that is, the open state of the normally closed contact 6U is maintained in cooperation with the contact spring 19.

次に、上述したそれぞれ独立の保持機才１ｕによって保
持される常閉接点６Ｕの開放状態お工び常開接点８ＳＴ
の閉成状態を選択的に解除するリセット観梅の構成につ
いて説明する。Next, the normally open contact 6U held by the above-mentioned independent holding mechanism 1u is opened, and the normally open contact 8ST is opened.
The configuration of the reset viewing system for selectively canceling the closed state will be explained.

常開接点８ＳＴの可動軸１８には、常開接点８ＳＴの閉
成下においてレバー２２に当接または近接するビン１３
ｄｉ設ける。レバー２２は固定部材に回動可能に設け、
その一端部全常開接点８ＳＴの閉成下において可動軸１
Ｂのビンｌａｄに当接ま穴は近接させるようにし、他端
部には長孔ｚ２ａを形成し、この長孔２２ａに間接＠２
Ｂの一端部に設けたビン２８ａ’ｉ保合させる。間接軸
２８はヒユーズボックス本体２４に軸２４ａｉ中心に回
動可能に設けたヒユーズカバー２４ｂの閉塞下において
これに対してほぼ垂直方向に延在してスライド可能に設
け、その他端はヒユーズカバー２４ｂの閉塞下において
これに当接させる。また、この間接軸２８の他端部には
ストッパ２８ｂ４設け、このストッパ２８ｂと間接＠２
８の移動を案内するガイド部材２５との間にばね２６を
巻装して、間接＠２ａ全ヒユーズカバー２４の方向にス
ライドするよう附勢する。The movable shaft 18 of the normally open contact 8ST includes a pin 13 that contacts or approaches the lever 22 when the normally open contact 8ST is closed.
di set up. The lever 22 is rotatably provided on a fixed member,
When the one end of the fully normally open contact 8ST is closed, the movable shaft 1
The abutment hole is placed close to the bottle lad of B, and a long hole z2a is formed at the other end, and an indirect @2
The bottle 28a'i provided at one end of B is held together. The indirect shaft 28 is provided so as to be slidable so as to extend substantially perpendicularly to the fuse cover 24b, which is provided on the fuse box main body 24 so as to be rotatable about the shaft 24ai, when the fuse cover 24b is closed. It is brought into contact with this under occlusion. Further, a stopper 28b4 is provided at the other end of this indirect shaft 28, and this stopper 28b and the indirect @2
A spring 26 is wound between the fuse cover 8 and a guide member 25 that guides the movement of the fuse cover 8, and urges it to slide in the direction of the indirect @ 2a full fuse cover 24.

すなわち、本例では、ヒユーズカバー２４ｂｉ＠　２４
　ａ　’ｉｉ中心に回動させて開放することにより、ヒ
ユーズカバー２４ｂと間接軸２８との当接を解除して間
接軸２８金ストッパｚ８ｂＶＣよって規制される所定の
位置までばね２６によってスライドさせ、この間接軸ｚ
８のスライドに応動するレバー［２の回動によってビン
１８ｄ＠介して可動軸２・−１８全ばね１７および接点
ばね１６の力に抗して可動鉄片１２の他端部１２ｂが係
止部１１ａＫ係合する位置までスライドさせ、これにエ
リ常開接点ＢＳ’ｌ”の閉成状態ｉ　１７セツトしてこ
れを開放する。That is, in this example, the fuse cover 24bi@24
By rotating the fuse cover 24b around the center to open it, the contact between the fuse cover 24b and the indirect shaft 28 is released, and the indirect shaft 28 is slid by the spring 26 to a predetermined position regulated by the gold stopper z8bVC. indirect axis z
The other end 12b of the movable iron piece 12 engages the locking portion 11aK through the pin 18d@ by the rotation of the lever [2 that responds to the slide of 8] against the force of the movable shaft 2-18 full spring 17 and contact spring 16. Slide it to the engaged position, set the normally open contact BS'l'' to the closed state i17, and then open it.

また、常閉接点６Ｕの可動軸１８の係止部１８ｂに選択
的に係合する係止レバー２０の他端部には間接＠２７の
一端部・当接させる。この間接軸２７は、ヒユーズカバ
ー２４ｂの閉塞下においてこれに対してほぼ垂直方向に
延在してスライド可能に設け、その他端はヒユーズカバ
ー２４ｂの閉塞下においてその近傍に位置させる。一方
、ヒユーズカバー２４ｂＫは、その閉塞下において間接
軸２７と対向する部分に凹部２８を形成し、この凹部２
８にヒユーズカバ−２４ｂ′ｆｒ貫通して間接軸２７に
選択的に当接するつまみ＠２９全設け、そのヒユーズカ
バー２４ｂの外側に突出する端部につまみ８０を取付け
ると共に、つまみ８０と凹部２８の底面２８ａとの間に
、つまみ軸２９ｆｔ間接軸２７から離間する方向に附勢
するばね８１ケつまみ軸２９に巻装して設ける。また、
つまみ軸２９のヒユーズカバー２４ｂの内側に突出する
端部にはストツバ２９　ａ″ｆｔ設け、これによりはね
８１によるつまみ軸２９の移動を規制する。Further, the other end of the locking lever 20 that selectively engages with the locking portion 18b of the movable shaft 18 of the normally closed contact 6U is brought into contact with one end of the joint @27. This indirect shaft 27 is provided so as to be slidable so as to extend substantially perpendicularly to the fuse cover 24b when it is closed, and the other end is located near the fuse cover 24b when it is closed. On the other hand, the fuse cover 24bK has a recess 28 formed in a portion facing the indirect shaft 27 when the fuse cover 24bK is closed.
8, a knob @ 29 that passes through the fuse cover 24b'fr and comes into selective contact with the indirect shaft 27 is provided, and a knob 80 is attached to the end projecting outside of the fuse cover 24b, and the knob 80 and the bottom surface of the recess 28 are attached. 28a, a spring 81 is wound around the knob shaft 29 and is provided to bias the knob shaft 29 ft in a direction away from the indirect shaft 27. Also,
A stop flange 29a''ft is provided at the end of the knob shaft 29 that projects inward of the fuse cover 24b, thereby restricting movement of the knob shaft 29 by the spring 81.

すなわち、本例においては、ヒユーズカバー２４ｂの閉
塞下において、係止レバー２０の一端部２０ａが可動軸
１８の係止部１８ｂに係合している状態、すなわち常閉
接点６Ｕの開放状態下で間接軸２７の他端をつまみ軸２
９に当接あるいは近接させるようにし、この状態下でつ
まみ８０をばね８１の力に抗して凹部ｚ８の底面ＺＳａ
に当接するまで押込むことにより、つまみ軸２９を間接
軸２７に当接させながら間接軸２７をスライドさせ、こ
れにより係止レバー２０をばね２１の力に抗して回動さ
せて、その一端部２Ｑａと可動軸１８の係止部１８ｂと
の係合を解除して常閉接点６Ｕの開放状態全リセットし
てこれを閉成する。That is, in this example, when the fuse cover 24b is closed and the one end 20a of the locking lever 20 is engaged with the locking portion 18b of the movable shaft 18, that is, when the normally closed contact 6U is open, Pinch the other end of the indirect shaft 27 and tighten the shaft 2.
9, and in this state, the knob 80 is moved against the force of the spring 81 to the bottom surface ZSa of the recess z8.
By pushing the knob shaft 29 into contact with the indirect shaft 27, the indirect shaft 27 is slid, thereby rotating the locking lever 20 against the force of the spring 21, and one end of the locking lever 20 is rotated against the force of the spring 21. The engagement between the portion 2Qa and the locking portion 18b of the movable shaft 18 is released, the normally closed contact 6U is completely reset to the open state, and the normally closed contact 6U is closed.

なお、ヒユーズカバー２４ｂは三相に対して同一のもの
でロク、ヒユーズボックス本体２４に設は穴カバースナ
ップ８２１ＣＪ：ってその閉塞状態を有効に維持するよ
うＴ／Ｃ構成する。The fuse cover 24b is the same for the three phases, and the fuse box main body 24 is provided with a hole cover snap 821CJ: T/C configured to effectively maintain its closed state.

以下動作を説明する。The operation will be explained below.

第２図はヒユーズ４Ｕが有効に接続されている正常状、
態を示すものであり、この状態では常閉接点６Ｕは接点
ばね１９の押圧力に、Ｃり有効に閉成していると共に、
ヒユーズ溶断検知コイル５Ｕには殆んど電流が流れない
ため、可動鉄片１２はばね１４の力によりその他端部１
ｚｂが可動軸１８の係止部ＩＢ＆に有効に係合し、常開
接点８ＳＴは開放している。Figure 2 shows a normal state in which fuse 4U is effectively connected.
In this state, the normally closed contact 6U is effectively closed by the pressing force of the contact spring 19, and
Since almost no current flows through the fuse blowout detection coil 5U, the movable iron piece 12 is moved to the other end 1 by the force of the spring 14.
zb is effectively engaged with the locking portion IB& of the movable shaft 18, and the normally open contact 8ST is open.

ここで、短絡あるいは過負荷によってヒユーズ４Ｕが溶
断すると、第８図Ａに示すように、ヒユーズ溶断検知コ
イル５Ｕに発生する磁力によって可動鉄片１２はばね１
４の力に抗（７て瞬時に回動し、その一端部１２ａが鉄
芯１１に吸引保持されると共に、他端部１’Ｂｂが可動
軸１ａの係止部１８ａから離れる。これにより、可動軸
１８はばね１７の押圧力によってスライドし、その一端
部に遊嵌した可動接片８ＳＴ−１は接点ばね１６の押圧
力によって接点８ＳＴ−２，８ＳＴ−ＢＶＣ接触して、
その常開接点８ＳＴの閉成状態が保持される。また、常
閉接点６Ｕの可動軸１８は、常開接点８ＳＴの可動軸Ｉ
Ｂのスライドに応動して、連結ビン１８ａｆ介して若干
遅れて接点ばね１９の力に抗してスライドし、その一端
に設けた可動接片６Ｕ−１が常開接点８ＳＴの閉成から
若干遅れて接点６Ｕ−２，６Ｕ−８から離間すると共に
、所定のスライド位置において係止レバー２０がばねｚ
ｌの押圧力によって回動してその一端部２０ａが可動軸
１８の係止部１８ｂに係合し、これによりその常閉接点
６Ｕの開放状態が保持される。なお、常閉接点６Ｕが開
放すると、ヒユーズ溶断検知コイル５Ｕへの電流通路が
遮断され、可動鉄片１２はばね１４の押圧力によって回
動してその一端部１２ａが鉄芯１１から離間する。Here, when the fuse 4U blows out due to a short circuit or an overload, the movable iron piece 12 is moved by the spring 1 due to the magnetic force generated in the fuse blowout detection coil 5U, as shown in FIG. 8A.
It instantly rotates against the force of 4 (7), and its one end 12a is attracted and held by the iron core 11, and the other end 1'Bb is separated from the locking part 18a of the movable shaft 1a. The movable shaft 18 slides due to the pressing force of the spring 17, and the movable contact piece 8ST-1 loosely fitted to one end thereof contacts the contacts 8ST-2 and 8ST-BVC due to the pressing force of the contact spring 16.
The closed state of the normally open contact 8ST is maintained. Furthermore, the movable shaft 18 of the normally closed contact 6U is the movable shaft I of the normally open contact 8ST.
In response to the slide of B, the movable contact piece 6U-1 slides through the connecting pin 18af with a slight delay against the force of the contact spring 19, and the movable contact piece 6U-1 provided at one end of the movable contact piece 6U-1 slides with a slight delay from the closing of the normally open contact 8ST. The locking lever 20 is moved away from the contacts 6U-2 and 6U-8 at a predetermined sliding position, and the locking lever 20 is released by the spring z.
It is rotated by the pressing force of 1, and its one end 20a engages with the locking portion 18b of the movable shaft 18, thereby maintaining the normally closed contact 6U in the open state. Note that when the normally closed contact 6U opens, the current path to the fuse blowout detection coil 5U is cut off, and the movable iron piece 12 is rotated by the pressing force of the spring 14, so that one end 12a thereof is separated from the iron core 11.

本例においては、各相において同様の機構を有するもの
で心るから、上述したようにヒユーズ溶断検知コイル５
Ｕが作動して常開接点８ＳＴが閉成すると、第１図にお
いて説明したように、Ｓ−Ｔ相間が短絡してヒユーズ４
ｖおよび／または４Ｗが溶断し、常閉接点６ｖおよび／
または６Ｗ。In this example, since each phase has a similar mechanism, the fuse blowout detection coil 5 is used as described above.
When U operates and the normally open contact 8ST closes, as explained in FIG.
v and/or 4W melts, normally closed contacts 6v and/or
Or 6W.

それと対応する常開接点８ＴＲおよび／または８Ｒ８が
それぞれ開放および閉成して同様にそれらの状態が保持
される。The corresponding normally open contacts 8TR and/or 8R8 open and close, respectively, and similarly maintain their states.

次に、溶断したヒユーズを変換するために、つまみ８０
を引いてヒユーズカバー２４ｂｌ＠２４ａ全中心に回動
させて開放すると、第８図Ｂに示す工うに、間接軸２Ｂ
はばね２６の押圧力によってストッパ２８ｂが前面のヒ
ユーズボックス本体２４に当接するまでスライドすると
共に、レバー２２はビン２８ａを介して回動する。この
レバー２２の回動によｐ１可動軸１Ｂはビン１ｓａ１に
介してばね１７お工び接点ばね１６の押圧力に抗して可
動鉄片１２の他端部ＩＺｂが保止部１／３ａＫ係合する
位置までスライドし、これにエリ常開接点８ＳＴは開放
する。この開放状態は、可動鉄片１２の他端部１２ｂが
ばね１４の押圧力によって係上部１８　ａに係合するこ
とにより、有効に保持される。なお、ヒユーメカバー２
４ｂは三相に対して同一のものであるから、このヒユー
ズカバー２４ｂの開放により他の常開接点８ＴＲ，８Ｒ
８も同時にリセットされて開放状態となる。Next, in order to convert the blown fuse, turn the knob 80.
When the fuse cover 24bl@24a is rotated to the entire center and opened, the joint shaft 2B is opened as shown in Fig. 8B.
Due to the pressing force of the spring 26, the stopper 28b slides until it comes into contact with the front fuse box body 24, and the lever 22 rotates via the pin 28a. By this rotation of the lever 22, the p1 movable shaft 1B is moved by the spring 17 through the pin 1sa1, and the other end IZb of the movable iron piece 12 engages with the retaining portion 1/3aK against the pressing force of the contact spring 16. The normally open contact 8ST is opened at this point. This open state is effectively maintained by the other end 12b of the movable iron piece 12 being engaged with the engaging portion 18a by the pressing force of the spring 14. In addition, Hyume Cover 2
4b is the same for the three phases, opening this fuse cover 24b opens the other normally open contacts 8TR and 8R.
8 is also reset at the same time and becomes open.

この状態で各相の溶断したヒユーズを取外してそれぞれ
新しいヒユーズを装着するが、この状態ではヒユーズが
溶断した相に対応する常閉接点６Ｕと、６ｖおよび／ま
たは６Ｗとは開放状態に保持されていると共に、閉成さ
れた常開接点８ＳＴと８ＴＲおよび／または８Ｒ８とは
、上述したようにそれぞれリセットされて開放状態に保
持され、互いに異なる二相間の電路は全て遮断されてい
るから、ヒユーズ交換を安全かつ容易に行なうことがで
きる。In this state, the blown fuses of each phase are removed and new fuses are installed. In this state, the normally closed contacts 6U and 6V and/or 6W corresponding to the phase in which the fuses have blown are kept open. At the same time, the normally open contacts 8ST, 8TR and/or 8R8, which are closed, are reset and held in the open state as described above, and all electrical circuits between two different phases are cut off, so it is not necessary to replace the fuse. can be carried out safely and easily.

ヒ：ｘ−−スノ交換完了後は、ヒユーズカッ＜−ｚ＋ｂ
全回動させ、カバースナップ３２にエリ押圧して閉塞し
元状態で、第８図Ｇに示すように、つまみ８０金ばね８
１の押圧力に抗して凹部２８の底面ＺＳａに当接する方
向に押込む。このように、つまみ８０を押込むと、つま
み軸８２９を介して間接軸２７がスライドして、係止し
Ａ−２０がばねｚｌの押圧力に抗して回動し、これにエ
リ係止レバーｚＯの一端部２０ａと可動軸１８の係止部
１８ｂとの保合が解除され、可動軸１８は接点ばね１９
の押圧力によってスライドし、可動接片６Ｕ−１が接点
６Ｕ−２，６Ｕ−８に接触して常閉接点６Ｕが閉成し、
第２図に示す正常状態に復帰する。同様に１他の相に対
しても、対応するつまみを押込んで常閉接点の開放状態
全リセットして閉成させることにより、第２図に示すと
同様な正常状態に復帰させることができる。h:
Fully rotate the cover snap 32, press the edge to close it, and as shown in Figure 8G, remove the knob 80 and the gold spring 8
1 in the direction of contacting the bottom surface ZSa of the recess 28. In this way, when the knob 80 is pushed in, the indirect shaft 27 slides and locks through the knob shaft 829, and A-20 rotates against the pressing force of the spring zl, and the edge is locked there. The engagement between the one end 20a of the lever zO and the locking portion 18b of the movable shaft 18 is released, and the movable shaft 18 is released from the contact spring 19.
The movable contact piece 6U-1 contacts the contacts 6U-2 and 6U-8, and the normally closed contact 6U closes.
The normal state shown in FIG. 2 is restored. Similarly, for the other phases, the normal state shown in FIG. 2 can be restored by pushing in the corresponding knob to reset all open states of the normally closed contacts and close them.

上述した実施例によれば、ヒユーズの溶断ニよる常開接
点の閉成状態を、常閉接点の開放状態全維持しｆ？：、
まま、ヒユーズ交換の友めにヒユーズカバー２４ｂ’ｆ
−開放するのに応動してリセットさせるようにしたから
、ヒユーズ交換を容易かつ安全に行なうことができる。According to the embodiment described above, the closed state of the normally open contact due to the fuse blowing is maintained in the open state of the normally closed contact. :,
Okay, fuse cover 24b'f for my friend who replaced the fuse.
- Since the fuse is reset in response to opening, the fuse can be replaced easily and safely.

なお、本発明は上述した例にのみ限定されるものではな
く、幾多の変形ま７ｔは変更が可能である。It should be noted that the present invention is not limited to the above-mentioned example, and can be modified in many ways.

例えば、上述した実施例では各相に対応して常閉接点の
開放状ｕをリセットするためのつまみを設けたが、一つ
のつまみを共用して各相の常閉接点の開放状態を同時に
リセットするよう構成することもできる。また、常開接
点の閉成状態のリセットは、ヒユーズカバー２４ｂの開
放に応動させることなく、それぞれ独立にあるいは同時
に行なうよう構成することもできる。For example, in the embodiment described above, a knob was provided for resetting the open state u of the normally closed contact for each phase, but one knob is shared to reset the open state of the normally closed contact of each phase at the same time. It can also be configured to do so. Further, the closed state of the normally open contacts can be reset independently or simultaneously without responding to the opening of the fuse cover 24b.

以上述べたように、本発明によれば、三相のうちのある
相のヒユーズが溶断したら、直ちに他の二相のいずれか
、または双方のヒユーズを自動的に溶断てるから、欠相
による電気機器の損傷全有効に防止することができる。As described above, according to the present invention, when the fuse of one of the three phases blows out, the fuses of one or both of the other two phases are immediately blown out automatically. All equipment damage can be effectively prevented.

また、各相のヒユーズ溶断検知コイルと直列に接続した
常閉接点の開放状態と、その常閉接点と対応する異なる
二相間に接続さｆ″Ｌ尺短絡用の常開接点の閉成状態と
全選択的に解除できるようにしたから、溶断後のヒユー
ズの交換を安全かつ容易に行なうことができる。In addition, the open state of a normally closed contact connected in series with the fuse blow detection coil of each phase, and the closed state of a normally open contact for f''L short circuit connected between two different phases corresponding to the normally closed contact. Since all the fuses can be released selectively, the fuse can be replaced safely and easily after blowing.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の三相三線式欠相防止用ヒユーズボック
スの一例の回路構成図、 第２図は同じく一例の機械的構成図、 第８図Ａ、ＢおよびＣはその動作？説明するための図で
ある。 １’、　１’、　２．２’、　８．８’・・・電圧側電
線４Ｕ、　４Ｖ、　４Ｗ・・・ヒユーズ ５Ｕ、　５Ｖ、　５Ｗ・・・ヒユーズ溶断検知コイル６
Ｕ、　６Ｖ、　６Ｗ　−・・常閉接点７Ｒ３，７ＳＴ、
　？ＴＲ・・・限流抵抗８Ｒ８，８ＳＴ、　８ＴＲ・・
・常開接点１１・・・鉄芯　１２・・・可動鉄片 １Ｂ・・・可動Ｔ＠　１８ａ・・・係止部１８０・・・
連動環　１８Ｃ１・・・ビン１４、・・・ばね　１６・
・・接点ばね１７・・・ばね　１８・・・可動軸 １８ａ・・・連結ビン　１８ｂ・・・係止部１９・・・
接点ばね　２０・・・係止レバー２１・・・ばね　２２
・・・レバー ２８・・・間接軸　２４・・・ヒユーズボックス本体２
４ｂ・・・ヒユーズカバー　１・・・ハネ２７・・・間
接軸　２８・・・凹部 ２９・・・つまみ軸　８０・・・つまみ８１・・・ばね
　８２・・・カバースナップ。 第１図 第２図Fig. 1 is a circuit configuration diagram of an example of a three-phase, three-wire fuse box for preventing phase loss according to the present invention, Fig. 2 is a mechanical configuration diagram of the same example, and Fig. 8 A, B, and C are its operations? It is a figure for explaining. 1', 1', 2.2', 8.8'... Voltage side electric wire 4U, 4V, 4W... Fuse 5U, 5V, 5W... Fuse blowout detection coil 6
U, 6V, 6W - Normally closed contact 7R3, 7ST,
? TR...Current limiting resistor 8R8, 8ST, 8TR...
・Normally open contact 11... Iron core 12... Movable iron piece 1B... Movable T@ 18a... Locking part 180...
Interlocking ring 18C1... Bin 14,... Spring 16.
...Contact spring 17...Spring 18...Movable shaft 18a...Connection pin 18b...Locking part 19...
Contact spring 20...Latching lever 21...Spring 22
...Lever 28...Indirect shaft 24...Fuse box body 2
4b... Fuse cover 1... Wing 27... Indirect shaft 28... Recess 29... Knob shaft 80... Knob 81... Spring 82... Cover snap. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] Ｌ　三相の電圧側電線の各々に介挿されるヒユーズと並
列に接続され、ヒユーズの溶断により作動するヒユーズ
溶断検知コイルと、これらヒユーズ溶断検知コイルの各
々に直列に接続して設けた常閉接点と、各相の電圧側電
線間にそれぞれ設けた常開接点と、前記各々のヒユーズ
溶断検知コイルの作動により対応する相の前記常閉接点
およびこの相とは異なる二相の電圧側電線間に接続され
た前記常開接点を連動してそれぞれ開放および閉成する
連動機構と、各相に対応する前記常閉接点の開放状態お
よびこれと対応する前記常開接点の閉成状態をそれぞれ
独立して機械的に保持する保持機構と、これら保持機構
による前記常閉接点の開放状態および前記常開接点の閉
成状態を選択的に解除するリセット機構と金具えること
を特徴とする三相三線式欠相防止用ヒユーズボックス。L A fuse blowout detection coil that is connected in parallel with the fuse inserted in each of the three-phase voltage side electric wires and is activated when the fuse blows, and a normally closed contact that is connected in series to each of these fuse blowout detection coils. and the normally open contacts provided between the voltage side wires of each phase, and the normally closed contacts of the corresponding phase and the voltage side wires of two phases different from this phase due to the operation of each fuse blowing detection coil. An interlocking mechanism that interlocks and opens and closes the connected normally open contacts, and an interlocking mechanism that independently controls the open state of the normally closed contacts corresponding to each phase and the closed state of the corresponding normally open contacts, respectively. A three-phase, three-wire system comprising: a holding mechanism for mechanically holding the contact; and a reset mechanism for selectively releasing the open state of the normally closed contact and the closed state of the normally open contact by the holding mechanism. Fuse box to prevent phase loss.