JPH09218234A - Short circuit detector for ac electric circuit - Google Patents
Short circuit detector for ac electric circuitInfo
- Publication number
- JPH09218234A JPH09218234A JP8023958A JP2395896A JPH09218234A JP H09218234 A JPH09218234 A JP H09218234A JP 8023958 A JP8023958 A JP 8023958A JP 2395896 A JP2395896 A JP 2395896A JP H09218234 A JPH09218234 A JP H09218234A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- short
- electric circuit
- power supply
- electric
- 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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Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は交流電気回路の短絡
検出装置に係わり、特に受配電設備、フィーダ数の多い
交流電気回路の点検作業に好適な短絡検出装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-circuit detecting device for an AC electric circuit, and more particularly to a short-circuit detecting device suitable for inspection work of power receiving and distributing equipment and AC electric circuits having a large number of feeders.
【0002】[0002]
【従来の技術】図6に短絡検出の適用対象となる被検査
回路として、受配電設備の交流電気回路を例示する。2. Description of the Related Art FIG. 6 illustrates an AC electric circuit of a power receiving and distributing facility as a circuit to be inspected to which short circuit detection is applied.
【0003】図6において、1は受配電設備の交流電
源、2は母線、3及びCBは遮断器、4及びTは変圧
器、5及びMは電動機である。この種の交流電気回路
は、主として母線2から分岐して遮断器(CB)3、変
圧器(T)4、電動機(M)5等を多段に接続すること
で構成されている。図7は、図6における一部(A部)
を複線図で示しており、図を簡便化するため単相の場合
を示している。In FIG. 6, 1 is an AC power source for power distribution equipment, 2 is a bus bar, 3 and CB are circuit breakers, 4 and T are transformers, and 5 and M are electric motors. This type of AC electric circuit is mainly configured by branching from a bus bar 2 and connecting a circuit breaker (CB) 3, a transformer (T) 4, an electric motor (M) 5 and the like in multiple stages. FIG. 7 is a part (A part) in FIG.
Is shown in a double-line diagram, and the case of a single phase is shown in order to simplify the diagram.
【0004】図7に示すように、このような受配電回路
において、短絡の有無を検出する場合には、一般的に簡
便な方式として、テスター7、絶縁抵抗計8、ホイート
ストンブリッジ9等の計測器が用いられる。図中、符号
の6或いはSは、被検査対象たる変圧器4の短絡を等価
的に表わしたスイッチである。As shown in FIG. 7, when detecting the presence or absence of a short circuit in such a power receiving / distributing circuit, generally, as a simple method, a tester 7, an insulation resistance meter 8, a Wheatstone bridge 9, etc. are measured. Vessels are used. In the figure, reference numeral 6 or S is a switch equivalently representing a short circuit of the transformer 4 to be inspected.
【0005】これらの計測器7,8,9は、いずれか一
つが使用されるか、或いは必要に応じて複数併用され
る。このうちテスター7を用いた等価回路が図8、図9
に例示されており、図8は回路が短絡していない状態、
図9は短絡した状態を示す。Any one of these measuring instruments 7, 8 and 9 is used, or a plurality of measuring instruments are used together as required. Of these, the equivalent circuits using the tester 7 are shown in FIGS.
FIG. 8 shows a state in which the circuit is not short-circuited,
FIG. 9 shows a short-circuited state.
【0006】これらの方式は、そのいずれも短絡検出用
の電源Eを直流電源としており、短絡検査対象となる回
路4の内部抵抗をrT、誘導性リアクタンスをxT、短
絡抵抗をrsとすると、非短絡の場合のテスター電流I
Nは、IN=E/rT、短絡している場合のテスター電流
IsはIs=E/rsoで表わされる(rsoは、rs
oとrTとの合成抵抗である)。In any of these methods, the power source E for detecting a short circuit is a DC power source, and if the internal resistance of the circuit 4 to be short-circuited is rT, the inductive reactance is xT, and the short-circuit resistance is rs, it is non- Tester current I in case of short circuit
N is I N = E / rT, and the tester current Is when short-circuited is represented by Is = E / rso (rso is rs
It is the combined resistance of o and rT).
【0007】[0007]
【発明が解決しようとする課題】交流電気回路の保守、
点検作業において、作業完了時の短絡検査は重要な業務
である。[Problems to be Solved by the Invention] Maintenance of an AC electric circuit,
In inspection work, short-circuit inspection at the completion of work is an important task.
【0008】上記の従来の短絡検出装置は、いずれもが
短絡検出用の電源を直流電源としているため、例えば被
検査対象の交流電気回路が変圧器・変成器等のように誘
導リアクタンスを主とする回路や不完全短絡の場合に
は、短絡と内部抵抗との区別が難しく、その短絡状況の
判断に熟練技術を必要としていた。In all of the above-mentioned conventional short-circuit detecting devices, the power source for short-circuit detection is a DC power source, so that the AC electric circuit to be inspected mainly has an inductive reactance like a transformer or a transformer. In the case of a short circuit or an incomplete short circuit, it is difficult to distinguish between the short circuit and the internal resistance, and skill is required to judge the short circuit situation.
【0009】また、受配電設備のように多数の分岐回路
を有する設備においては、必要に応じて複数の計測器を
併用したり、計測回路を細分分離する等の方法が用いら
れるが、簡便性に欠けていた。特に、既存の計測器の指
示は、アナログ的であるため、計測毎に熟練した判断を
必要とする。高級な回路計測装置も開発されているが高
額であり、簡便性に欠けることから、現場,現地には、
不向きであった。Further, in equipment having a large number of branch circuits such as power receiving and distributing equipment, a method of using a plurality of measuring instruments together or subdividing the measuring circuits is used if necessary, but it is simple. Was lacking in. In particular, since the instructions of the existing measuring instruments are analog, skilled judgment is required for each measurement. Although high-grade circuit measuring devices have been developed, they are expensive and lack in simplicity.
It was unsuitable.
【0010】さらに既存の計測器は、専用の又は特別の
電源が必要であり、予めその準備が必要なため、現場や
現地で用いるには不便であった。Furthermore, the existing measuring instrument requires a dedicated or special power source, and it is necessary to prepare the power source in advance, so that it is inconvenient to use it on site or in the field.
【0011】本発明は上記実情に鑑みてなされたもの
で、その目的は、既存の計測器では短絡の有無が判別し
がたい機器(例えば、変圧器のように誘導リアクタンス
を主とする交流電気回路や不完全短絡の生じている回
路)に対しても簡便な手段により短絡検出を容易に行い
得る短絡検出装置を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is a device in which it is difficult to determine the presence or absence of a short circuit in an existing measuring instrument (for example, an AC electrical device mainly having an inductive reactance such as a transformer). It is an object of the present invention to provide a short-circuit detection device which can easily detect a short circuit by a simple means even for a circuit or a circuit in which an incomplete short circuit occurs.
【0012】さらに、受配電設備、フィーダ数の多い交
流電気回路であっても、短絡検出を簡便に行うことがで
き、しかも、現場,現地での点検に便利な交流電気回路
の短絡検出装置を提供することにある。Further, a short-circuit detection device for an AC electric circuit, which can easily detect a short circuit even in a power receiving / distributing facility or an AC electric circuit having a large number of feeders, and which is convenient for on-site and on-site inspections. To provide.
【0013】[0013]
【課題を解決するための手段】本発明は、上記目的を達
成するために、基本的には、被検査対象となる交流電気
回路に接続して、該交流電気回路の短絡の有無を検出す
る装置において、短絡検出に用いるインピーダンスを備
え、このインピーダンスを介して交流電源を短絡検出用
の電源として前記交流電気回路に接続可能にした(これ
を課題解決手段1とする)。In order to achieve the above object, the present invention is basically connected to an AC electric circuit to be inspected and detects the presence or absence of a short circuit in the AC electric circuit. The apparatus is provided with an impedance used for short-circuit detection, and an AC power supply can be connected to the AC electric circuit as a power supply for short-circuit detection through this impedance (this is referred to as problem solving means 1).
【0014】また、このような短絡検出装置の具体的な
態様として、前記インピーダンスのほかに整流器付きの
表示器(例えば、表示灯,ブザー等)を備え、前記イン
ピーダンスを介して交流電源を短絡検出用の電源として
前記交流電気回路に接続可能にし、この交流電源・交流
電気回路の接続時に前記整流器付き表示器が前記交流電
気回路と並列に接続される構成とし、この表示器を通し
て短絡の有無を判別可能にしたものや(これを課題解決
手段2とする)、短絡検出に用いる変圧器、整流器付き
表示器を備え、前記変圧器を介して交流電源を短絡検出
用の電源として前記交流電気回路に接続可能にし、この
交流電源・交流電気回路の接続時に前記整流器付き表示
器が前記交流電気回路と並列に接続される構成とし、こ
の表示器を通して短絡の有無を判別可能にしたものや
(これを課題解決手段3とする)、短絡検出に用いる変
圧器、継電器を備え、前記変圧器を介して交流電源を短
絡検出用の電源として前記交流電気回路に接続可能に
し、前記継電器が前記変圧器の1次側に接続されて、こ
の継電器のコイルには、前記変圧器の2次側に接続され
る前記交流電気回路が短絡した時に作動電圧が印加され
る構成とし、且つこの継電器を介して作動する表示器を
有するもの(これを課題解決手段4とする)を提案す
る。Further, as a specific mode of such a short-circuit detection device, a display device with a rectifier (for example, an indicator lamp, a buzzer, etc.) is provided in addition to the impedance, and the short-circuit detection of the AC power source is performed through the impedance. It can be connected to the AC electric circuit as a power supply for, and the display with the rectifier is connected in parallel with the AC electric circuit at the time of connecting the AC power supply / AC electric circuit, and whether there is a short circuit through the display. The AC electric circuit is provided with a distinguishable one (this is referred to as problem solving means 2), a transformer used for short circuit detection, and an indicator with a rectifier, and an AC power source is used as a power source for short circuit detection through the transformer. The display with rectifier is connected in parallel with the AC electric circuit when the AC power supply / AC electric circuit is connected. The AC electric power supply is provided with a device capable of discriminating the presence or absence of a fault (this is referred to as problem solving means 3), a transformer used for short circuit detection, and a relay, and the AC power source is used as a power source for short circuit detection via the transformer. Circuit is connected, the relay is connected to the primary side of the transformer, and the coil of the relay has an operating voltage when the AC electric circuit connected to the secondary side of the transformer is short-circuited. It is proposed that the device is configured to be applied and has an indicator that operates through this relay (this will be referred to as problem solving means 4).
【0015】なお、これらの作用については、次の実施
の形態の項で述べる。These functions will be described in the section of the next embodiment.
【0016】[0016]
【発明の実施の形態】本発明の実施の形態を図1から図
6を参照して説明する。なお、図1〜図6に示される被
検査対象の交流電気回路(変圧器)4は既述の図6〜図
9のものと同様であり、各図で使用される同じ符号は同
一或いは共通する要素を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The AC electric circuit (transformer) 4 to be inspected shown in FIGS. 1 to 6 is the same as that of FIGS. 6 to 9 described above, and the same reference numerals used in the drawings are the same or common. Indicates the element to do.
【0017】図1は、本発明の原理構成を示す実施形態
で、前記課題解決手段1に対応する。FIG. 1 is an embodiment showing the principle configuration of the present invention and corresponds to the problem solving means 1.
【0018】図1において、短絡検査を行う場合には、
その被検査対象となる交流電気回路(ここでは変圧器)
4に中継の短絡検出用のインピーダンス14Aを介して
交流電源(E)10が接続される。インピーダンス14
Aは、短絡検出用のもので、Zoとしても表示される。
インピーダンス14Aを適宜選択することで、通常の電
灯電源を短絡検出用の電源10として交流電気回路4に
接続可能にしてある。スイッチ(S)6は、既述したよ
うに短絡回路を等価的に示したものであり、その短絡イ
ンピーダンスをrsとする。In FIG. 1, when performing a short circuit inspection,
AC electric circuit (transformer here) to be inspected
An AC power source (E) 10 is connected to the relay unit 4 via a relay short-circuit detection impedance 14A. Impedance 14
A is for short circuit detection and is also displayed as Zo.
By appropriately selecting the impedance 14A, a normal electric lamp power source can be connected to the AC electric circuit 4 as the power source 10 for detecting a short circuit. The switch (S) 6 is equivalent to a short circuit as described above, and its short circuit impedance is rs.
【0019】本発明は、基本的には、インピーダンス1
4Aに流れる電流の大きさにより交流電気回路,例えば
変圧器4の短絡の有無を検出する。The present invention basically has an impedance of 1.
The presence or absence of a short circuit in the AC electric circuit, for example, the transformer 4, is detected by the magnitude of the current flowing through 4A.
【0020】変圧器4の内部インピーダンスZTは、抵
抗rTと誘導性リアクタンスxTとにより構成されてい
るので、回路に流れる電流Iは、短絡しない状態では
(1)式で示され、短絡された状態では、(2)式とな
る。Since the internal impedance ZT of the transformer 4 is composed of the resistance rT and the inductive reactance xT, the current I flowing in the circuit is represented by the equation (1) in the non-short-circuited state, and is in the short-circuited state. Then, it becomes a formula (2).
【0021】[0021]
【数1】 [Equation 1]
【0022】[0022]
【数2】 [Equation 2]
【0023】ここで、一般にrs≪ZTであるため、I
s≫INとなり、このIsとINの関係から、短絡の有無
を容易に判別できる。このような短絡検出方式によれ
ば、変圧器のように誘導リアクタンスを主とする交流電
気回路や不完全短絡の生じている交流電気回路であって
も、非短絡と短絡時における中継インピーダンス14A
に流れる電流に顕著な差が生じるので、容易に短絡の有
無を判別することができる。Since rs << ZT in general, I
S»I N becomes, from the relationship between the Is and I N, can be easily determined whether or not a short circuit. According to such a short-circuit detection method, even in an AC electric circuit such as a transformer mainly having an inductive reactance or an AC electric circuit having an incomplete short circuit, the relay impedance 14A during non-short circuit and short circuit
Since there is a noticeable difference in the currents flowing through, it is possible to easily determine the presence or absence of a short circuit.
【0024】これに対して図8,図9に示す既存の直流
電源方式の計測器の原理では、INとIsとは、(3)
式、(4)式となるが、一般にrsとrTはどちらが大
きいか不明である場合が多く、このため従来方式では、
IsとITの大小関係も不明であり、上記のような誘導
リアクタンスを専ら回路要素とする交流電気回路の短絡
の有無を判別することは難しい。On the other hand, in the principle of the existing DC power supply type measuring instrument shown in FIGS. 8 and 9, I N and Is are (3)
In general, it is not clear which of rs and rT is larger. Therefore, in the conventional method,
Magnitude relationship Is and I T is also unknown, it is difficult to determine the presence or absence of a short circuit of an AC electric circuit exclusively circuitry inductive reactance as described above.
【0025】[0025]
【数3】 (Equation 3)
【0026】[0026]
【数4】 (Equation 4)
【0027】次に、上記の原理を応用した各種の実施形
態を図2〜図5により説明する。Next, various embodiments applying the above principle will be described with reference to FIGS.
【0028】図2の実施形態は、前記課題解決手段2に
対応する。The embodiment shown in FIG. 2 corresponds to the problem solving means 2.
【0029】本実施形態は、短絡検出に用いる交流電源
10,中継のインピーダンス14A,整流器11(RE
CT)付きの表示器12を備える。表示器12として、
表示灯(PLでも示される)が使用される。整流器11
は、例えばブリッジ整流回路が使用され、このブリッジ
整流回路の中に表示灯12が挿入接続してある。In this embodiment, an AC power source 10 used for short circuit detection, a relay impedance 14A, a rectifier 11 (RE).
The display 12 with CT) is provided. As the display 12,
An indicator light (also indicated by PL) is used. Rectifier 11
For example, a bridge rectifier circuit is used, and the indicator lamp 12 is inserted and connected in the bridge rectifier circuit.
【0030】ここでの短絡検出装置は、インピーダンス
14Aを介して交流電源10が短絡検出用の電源として
交流電気回路(変圧器)4に接続可能にしてあり、この
交流電源10・交流電気回路4の接続時に整流器11付
き表示灯12が並列に接続されるよう設定してある。In the short-circuit detecting device herein, the AC power source 10 can be connected to the AC electric circuit (transformer) 4 as a power source for detecting a short circuit through the impedance 14A. The indicator light 12 with the rectifier 11 is set to be connected in parallel at the time of connection.
【0031】本例によれば、変圧器4が短絡していない
場合は、表示灯12の回路における整流器11には、電
源電圧Eの内、インピーダンスZoと按分した電圧が印
加されるため、表示灯12が点灯する。短絡状態(スイ
ッチ6が閉状態)では、整流器11には電圧が印加され
ないため、消灯となる。したがって、短絡の有無の確認
を表示灯12を通して容易に判別することができる。According to this example, when the transformer 4 is not short-circuited, the voltage proportional to the impedance Zo of the power supply voltage E is applied to the rectifier 11 in the circuit of the indicator lamp 12. The lamp 12 is turned on. In the short-circuited state (the switch 6 is closed), no voltage is applied to the rectifier 11, and the light is turned off. Therefore, the presence / absence of a short circuit can be easily determined through the indicator lamp 12.
【0032】図3の実施形態は、課題解決手段3に対応
する。The embodiment of FIG. 3 corresponds to the problem solving means 3.
【0033】本実施形態は、図2の実施形態の変形例で
あり、短絡検出の中継手段として、インピーダンス14
Aの代わりに変圧器14Bを介在させた例である。This embodiment is a modification of the embodiment shown in FIG. 2, and the impedance 14 is used as a relay means for detecting a short circuit.
This is an example in which a transformer 14B is interposed instead of A.
【0034】すなわち、短絡検出に用いる変圧器14B
と整流器11付き表示灯12を備え、この変圧器14B
を介して交流電源10を短絡検出用の電源として交流電
気回路(変圧器)4に接続可能にした。整流器11・表
示灯12が交流電気回路4と並列に接続される。That is, the transformer 14B used for detecting a short circuit.
And the indicator light 12 with the rectifier 11 are provided.
The AC power supply 10 can be connected to the AC electric circuit (transformer) 4 as a power supply for detecting a short circuit via the. The rectifier 11 and the indicator lamp 12 are connected in parallel with the AC electric circuit 4.
【0035】本例では、第1,第2の実施形態同様に交
流電源10として通常の電灯電源の使用を可能にし、こ
れを変圧器14Bにより短絡検出用の交流電源として変
換できる。見方を変えれば変圧器14Bは短絡検出用の
交流電源・インピーダンスの要素となる。In this example, as in the first and second embodiments, it is possible to use a normal lamp power supply as the AC power supply 10, and this can be converted into an AC power supply for short circuit detection by the transformer 14B. From a different point of view, the transformer 14B serves as an AC power source / impedance element for detecting a short circuit.
【0036】交流電気回路4が非短絡の場合には、変圧
器14Bで設定された交流電源の電圧が整流器11付き
表示灯12と交流電気回路4に印加されて表示灯12が
点灯する。短絡状態(スイッチ6が閉状態)では、整流
器11には電圧が印加されないため、消灯となる。した
がって、短絡の有無の確認を表示灯12を通して容易に
判別することができる。When the AC electric circuit 4 is not short-circuited, the voltage of the AC power source set by the transformer 14B is applied to the indicator light 12 with the rectifier 11 and the AC electric circuit 4, and the indicator light 12 is turned on. In the short-circuited state (the switch 6 is closed), no voltage is applied to the rectifier 11, and the light is turned off. Therefore, the presence / absence of a short circuit can be easily determined through the indicator lamp 12.
【0037】本実施形態も第1,第2の実施形態と同様
に既存の直流電源方式短絡検出装置では短絡の有無の判
別が困難な交流電源回路に対しても簡便且つ容易に短絡
の有無を検出することができ、しかも、交流電源10と
短絡検出用の計測装置とを絶縁できる効果があり、実際
に使用するにあたっては都合がよい。In the present embodiment, similarly to the first and second embodiments, the presence / absence of a short circuit can be easily and easily detected even for an AC power supply circuit in which it is difficult to determine the presence / absence of a short circuit with an existing DC power system type short-circuit detector. It has the effect of being able to detect, and also being able to insulate the AC power supply 10 from the measuring device for detecting a short circuit, which is convenient in actual use.
【0038】図4の実施形態は、前記第3の課題解決手
段の変形例である。The embodiment shown in FIG. 4 is a modified example of the third problem solving means.
【0039】図4の短絡検出装置では、上記した短絡検
出用の変圧器14B、整流器11付き表示灯12のほか
にテストスイッチ15(PBでも示す)を備える。テス
トスイッチ15は、整流器11と並列接続されるよう設
定されて、そのスイッチ15を閉じることで交流電気回
路4の短絡を模擬することができる。The short-circuit detecting device of FIG. 4 is provided with a test switch 15 (also shown as PB) in addition to the above-described transformer 14B for short-circuit detection and the indicator light 12 with the rectifier 11. The test switch 15 is set to be connected in parallel with the rectifier 11, and by closing the switch 15, the short circuit of the AC electric circuit 4 can be simulated.
【0040】本実施形態によれば、短絡検出の簡便化,
容易性を図るほかに、次の効果を奏する。短絡検査に先
立ち、テストスイッチ15を閉状態にして表示灯12が
消灯するか、スイッチ14を開状態にして点灯するかを
確認することにより、事前に短絡検出装置が正常に動作
するかを確認することができる。According to the present embodiment, simplification of short circuit detection,
In addition to improving ease, the following effects are achieved. Prior to the short-circuit inspection, it is confirmed whether the short-circuit detection device normally operates in advance by checking whether the test switch 15 is closed and the indicator lamp 12 is turned off or the switch 14 is opened and turned on. can do.
【0041】図5の実施形態は、前記課題解決手段4に
対応する。The embodiment of FIG. 5 corresponds to the problem solving means 4.
【0042】本実施形態は、短絡状態をブザー17(B
Zで示す)で表示するようにした例である。短絡検出用
の変圧器14Bと継電器16とを備える。In this embodiment, the buzzer 17 (B
(Indicated by Z). A transformer 14B for detecting a short circuit and a relay 16 are provided.
【0043】短絡検出用の変圧器14Bついては、図
3,図4と同様である。また、変圧器14Bの1次(交
流電源10)側に継電器16が変圧器14Bの1次コイ
ルと直列に接続される。変圧器14Bの1次コイルの回
路と並列にブザー(表示器)17の回路が接続され、こ
のブザー回路に継電器16の接点19,押ボタンスイッ
チ18(符号PBでも表示される)が直列に挿入接続し
てある。The transformer 14B for detecting a short circuit is the same as that shown in FIGS. Further, the relay 16 is connected in series with the primary coil of the transformer 14B on the primary (AC power supply 10) side of the transformer 14B. The circuit of the buzzer (display) 17 is connected in parallel with the circuit of the primary coil of the transformer 14B, and the contact 19 of the relay 16 and the push button switch 18 (also indicated by the symbol PB) are inserted in series in this buzzer circuit. It is connected.
【0044】交流電器回路4が短絡されていない状態、
すなわちスイッチ6が開状態では、電源電圧Eの多くは
変圧器14Bに分担されるため、継電器16のコイルの
印加電圧がその作動電圧以下に設定されて継電器16の
接点19は開状態となり、ブザー17は鳴らない。回路
が短絡した状態、すなわちスイッチ6が閉状態では、変
圧器14Bの2次側が短絡状態となっているため、電源
電圧Eの多くは継電器16のコイルに印加される。この
印加電圧を継電器16の作動電圧以上に設定しているの
で、継電器16の接点19が閉状態となり、ブザー17
が鳴り短絡状態を表示する。ここで、ブザー17と直列
に挿入されている押ボタンスイッチ18は、ブザー17
を停止させるためのものである。When the AC electric circuit 4 is not short-circuited,
That is, when the switch 6 is in the open state, most of the power supply voltage E is shared by the transformer 14B, so that the voltage applied to the coil of the relay 16 is set to be equal to or lower than its operating voltage, and the contact 19 of the relay 16 is opened and the buzzer is opened. 17 does not ring. When the circuit is short-circuited, that is, when the switch 6 is closed, the secondary side of the transformer 14B is short-circuited, so most of the power supply voltage E is applied to the coil of the relay 16. Since this applied voltage is set to be equal to or higher than the operating voltage of the relay 16, the contact 19 of the relay 16 is closed and the buzzer 17
Sounds and the short-circuit status is displayed. Here, the push button switch 18 inserted in series with the buzzer 17 is
Is to stop.
【0045】なお、表示を確実に且つ簡単に行うため、
図1,図2に示す例を併用して用いてもよい。また、図
1から図5においては、交流電源10の電源電圧Eを二
点鎖線の囲い枠Dで示す短絡検出装置13,13A,1
3B,13C,13Dの外部に配置して図示している
が、これは、通常の電灯電源を使用できるようにしてい
るためである。この通常の電灯電源のほかにポータブル
発電機電源を使用することも可能であり、ポータブル発
電機電源を使用可能にした場合には、現場、現地での作
業を容易にする。変圧器14B、継電器16等の構成部
品はアナログ的な部品を選択することができ、この適切
な選択により現場、現地で入手容易な電灯電源を使用す
ることができる。In order to perform the display surely and easily,
The examples shown in FIGS. 1 and 2 may be used together. In addition, in FIGS. 1 to 5, the short circuit detection device 13, 13A, 1 in which the power supply voltage E of the AC power supply 10 is indicated by a box D surrounded by a chain double-dashed line
3B, 13C, and 13D are arranged outside the figure, but this is because a normal electric lamp power source can be used. It is also possible to use a portable generator power supply in addition to this normal electric light source, and when the portable generator power supply is enabled, work at the site and in the field is facilitated. For the components such as the transformer 14B and the relay 16, analog components can be selected, and by this proper selection, it is possible to use an electric light source that is easily available on-site and on-site.
【0046】さらに、短絡の有無を表示する表示器は、
ブザーと表示灯を併用することも可能である。Furthermore, the indicator for displaying the presence or absence of a short circuit is
It is also possible to use a buzzer and an indicator light together.
【0047】[0047]
【発明の効果】課題解決手段1によれば、中継のインピ
ーダンスを介して、短絡検出用の電源として交流電源を
使用可能にするので、例えば、誘導リアクタンスを主と
する交流電気回路や不完全短絡の交流電気回路のような
ものであっても、簡便な計測手段により回路の短絡の有
無を熟練を要さずして容易,確実に判別することができ
る。According to the problem solving means 1, since the AC power source can be used as the power source for detecting the short circuit through the impedance of the relay, for example, the AC electric circuit mainly having the inductive reactance or the incomplete short circuit. Even with such an AC electric circuit, it is possible to easily and surely determine the presence or absence of a short circuit in the circuit by a simple measuring means without requiring skill.
【0048】課題解決手段2〜課題解決手段4によれ
ば、上記の効果に加えて、短絡有無の判別結果を表示す
る表示器を備えるので、その短絡検査結果の認識を容易
にする。このため、複数の計測器を併用する場合や、計
測される回路の分離,細分等を行う場合であっても、そ
の点検作業の効率を高める。According to the problem solving means 2 to the problem solving means 4, in addition to the above-mentioned effects, since the display device for displaying the result of the judgment of the presence or absence of the short circuit is provided, the recognition of the short circuit inspection result is facilitated. Therefore, even when a plurality of measuring instruments are used together, or when the circuits to be measured are separated or subdivided, the efficiency of the inspection work is improved.
【0049】また、上記の第1〜第5の課題解決手段に
よれば、短絡検出用のインピーダンスや変圧器を適宜選
定することにより、短絡検出用電源(計測電源)として
通常現場、現地で使用されている電灯電源を使用するこ
とができるため、短絡検出装置を現地、現場で使用する
ことができる。Further, according to the above-mentioned first to fifth means for solving the problems, the impedance for short-circuit detection and the transformer are appropriately selected to be used as a power supply for short-circuit detection (measurement power supply) normally on site or in the field. Since it is possible to use the electric lamp power supply that is used, it is possible to use the short-circuit detection device locally or in the field.
【図1】本発明の第1の実施形態を示す構成図。FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
【図2】本発明の第2の実施形態を示す構成図。FIG. 2 is a configuration diagram showing a second embodiment of the present invention.
【図3】本発明の第3の実施形態を示す構成図。FIG. 3 is a configuration diagram showing a third embodiment of the present invention.
【図4】本発明の第4の実施形態を示す構成図。FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.
【図5】本発明の第5の実施形態を示す構成図。FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention.
【図6】本発明の適用対象の一例を示す受配電設備の回
路を示す図。FIG. 6 is a diagram showing a circuit of a power receiving and distribution facility showing an example of an application target of the present invention.
【図7】図6のA部を詳細に示す複線図。FIG. 7 is a double-track diagram showing in detail part A of FIG.
【図8】従来の短絡検出装置としてテスターを使用した
場合の説明図。FIG. 8 is an explanatory diagram when a tester is used as a conventional short-circuit detection device.
【図9】従来の短絡検出装置としてテスターを使用した
場合の説明図。FIG. 9 is an explanatory diagram when a tester is used as a conventional short-circuit detection device.
1…受配電設備の交流電源、2…受配電設備の母線、3
…遮断器、4…変圧器、5…電動機、6…短絡スイッ
チ、7…テスター、8…絶縁抵抗計、9…ホイートスト
ンブリッジ、10…交流電源、11…整流器、12…表
示器、13,13A〜13D…短絡検出装置、14A…
インピーダンス、14B…変圧器、15…押ボタンスイ
ッチ、16…継電器、17…ブザー、18…押ボタンス
イッチ、19…継電器の接点。1 ... AC power source of power distribution equipment, 2 ... Bus of power distribution equipment, 3
... Circuit breaker, 4 ... Transformer, 5 ... Electric motor, 6 ... Short circuit switch, 7 ... Tester, 8 ... Insulation resistance meter, 9 ... Wheatstone bridge, 10 ... AC power supply, 11 ... Rectifier, 12 ... Indicator, 13, 13A ~ 13D ... short circuit detection device, 14A ...
Impedance, 14B ... Transformer, 15 ... Pushbutton switch, 16 ... Relay, 17 ... Buzzer, 18 ... Pushbutton switch, 19 ... Relay contact.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 仲内 哲夫 茨城県日立市幸町三丁目2番2号 株式会 社日立エンジニアリングサービス内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Nakauchi 3-2-2 Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Engineering Service Co., Ltd.
Claims (7)
て、該交流電気回路の短絡の有無を検出する装置におい
て、 短絡検出に用いるインピーダンスを備え、このインピー
ダンスを介して交流電源を短絡検出用の電源として前記
交流電気回路に接続可能にしたことを特徴とする交流電
気回路の短絡検出装置。1. An apparatus which is connected to an AC electric circuit to be inspected and detects the presence or absence of a short circuit in the AC electric circuit, has an impedance used for detecting a short circuit, and detects an AC power supply through the impedance. A short circuit detection device for an AC electric circuit, wherein the AC electric circuit is connectable to the AC electric circuit as a power source.
て、該交流電気回路の短絡の有無を検出する装置におい
て、 短絡検出に用いるインピーダンス、整流器付き表示器を
備え、前記インピーダンスを介して交流電源を短絡検出
用の電源として前記交流電気回路に接続可能にし、この
交流電源・交流電気回路の接続時に前記整流器付き表示
器が前記交流電気回路と並列に接続される構成とし、こ
の表示器を通して短絡の有無を判別可能にしたことを特
徴とする交流電気回路の短絡検出装置。2. An apparatus for detecting the presence / absence of a short circuit in an AC electric circuit, which is connected to an AC electric circuit to be inspected, is provided with an impedance used for detecting a short circuit and an indicator with a rectifier, and through the impedance. An AC power supply can be connected to the AC electric circuit as a power supply for short circuit detection, and the indicator with the rectifier is connected in parallel with the AC electric circuit when the AC power supply / AC electric circuit is connected. A short-circuit detection device for an alternating-current electric circuit, characterized in that it is possible to determine the presence or absence of a short-circuit through the circuit.
て、該交流電気回路の短絡の有無を検出する装置におい
て、 短絡検出に用いる変圧器、整流器付き表示器を備え、前
記変圧器を介して交流電源を短絡検出用の電源として前
記交流電気回路に接続可能にし、この交流電源・交流電
気回路の接続時に前記整流器付き表示器が前記交流電気
回路と並列に接続される構成とし、この表示器を通して
短絡の有無を判別可能にしたことを特徴とする交流電気
回路の短絡検出装置。3. An apparatus for detecting the presence or absence of a short circuit in an AC electric circuit to be inspected by connecting to the AC electric circuit to be inspected, comprising a transformer used for short circuit detection, an indicator with a rectifier, and the transformer. Via the AC power supply as a power supply for short-circuit detection through the AC electric circuit can be connected, the display with the rectifier is connected in parallel with the AC electric circuit at the time of connecting the AC power supply / AC electric circuit, A short-circuit detecting device for an AC electric circuit, which is capable of discriminating the presence or absence of a short-circuit through a display.
て、該交流電気回路の短絡の有無を検出する装置におい
て、 短絡検出に用いる変圧器、継電器を備え、前記変圧器を
介して交流電源を短絡検出用の電源として前記交流電気
回路に接続可能にし、前記継電器が前記変圧器の1次側
に接続されて、この継電器のコイルには、前記変圧器の
2次側に接続される前記交流電気回路が短絡した時に作
動電圧が印加される構成とし、且つこの継電器を介して
作動する表示器を有することを特徴とする交流電気回路
の短絡検出装置。4. An apparatus for detecting the presence or absence of a short circuit in an AC electric circuit, which is connected to an AC electric circuit to be inspected, is provided with a transformer and a relay used for detecting a short circuit, and the AC is provided via the transformer. A power source is connectable to the AC electric circuit as a power source for short circuit detection, the relay is connected to the primary side of the transformer, and the coil of the relay is connected to the secondary side of the transformer. A short-circuit detecting device for an AC electric circuit, which is configured to apply an operating voltage when the AC electric circuit is short-circuited, and has an indicator which operates via the relay.
とも一つである請求項2ないし請求項4のいずれか1項
記載の交流電気回路の短絡検出装置。5. The short circuit detection device for an AC electric circuit according to claim 2, wherein the indicator is at least one of an indicator lamp and a buzzer.
ポータブル発電機電源を使用可能に構成した請求項1な
いし請求項5のいずれか1項記載の交流電気回路の短絡
検出装置。6. The short-circuit detection device for an AC electric circuit according to claim 1, wherein a normal lamp power supply and a portable generator power supply can be used as the AC power supply.
が可能なテストスイッチ回路を備える請求項1ないし請
求項6のいずれか1項記載の交流電気回路の短絡検出装
置。7. The short circuit detection device for an AC electric circuit according to claim 1, further comprising a test switch circuit capable of simulating a short circuit of the AC electric circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8023958A JPH09218234A (en) | 1996-02-09 | 1996-02-09 | Short circuit detector for ac electric circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8023958A JPH09218234A (en) | 1996-02-09 | 1996-02-09 | Short circuit detector for ac electric circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09218234A true JPH09218234A (en) | 1997-08-19 |
Family
ID=12125065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8023958A Pending JPH09218234A (en) | 1996-02-09 | 1996-02-09 | Short circuit detector for ac electric circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09218234A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100305921B1 (en) * | 1999-09-09 | 2001-11-07 | 윤문수 | Test equipment for making of ground and short in a distribution system |
JP2008020322A (en) * | 2006-07-13 | 2008-01-31 | Tokyo Electric Power Services Co Ltd | Device and method for detecting short-circuit of electrical installation |
CN106918761A (en) * | 2017-04-15 | 2017-07-04 | 三门县职业中等专业学校 | A kind of short-circuit protection diagnostic equipment |
-
1996
- 1996-02-09 JP JP8023958A patent/JPH09218234A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100305921B1 (en) * | 1999-09-09 | 2001-11-07 | 윤문수 | Test equipment for making of ground and short in a distribution system |
JP2008020322A (en) * | 2006-07-13 | 2008-01-31 | Tokyo Electric Power Services Co Ltd | Device and method for detecting short-circuit of electrical installation |
CN106918761A (en) * | 2017-04-15 | 2017-07-04 | 三门县职业中等专业学校 | A kind of short-circuit protection diagnostic equipment |
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