JPH05312878A - Inspection jig for wiring condition of power socket with grounding pole - Google Patents
Inspection jig for wiring condition of power socket with grounding poleInfo
- Publication number
- JPH05312878A JPH05312878A JP4120476A JP12047692A JPH05312878A JP H05312878 A JPH05312878 A JP H05312878A JP 4120476 A JP4120476 A JP 4120476A JP 12047692 A JP12047692 A JP 12047692A JP H05312878 A JPH05312878 A JP H05312878A
- Authority
- JP
- Japan
- Prior art keywords
- pole
- line
- poles
- grounding
- distribution board
- 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.)
- Granted
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、単相交流用接地極付電
源コンセントへの配線に対し、変圧器の接地してない電
極と分電盤の接地した極との交差誤接続の有無、及び変
圧器の接地極と分電盤の接地した極との交差誤接続の有
無などの配線状態を簡単かつ容易に検査できるようにし
た治具に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring to a power outlet with a grounding electrode for single-phase alternating current, whether or not there is an erroneous cross connection between an ungrounded electrode of a transformer and a grounded electrode of a distribution board, Also, the present invention relates to a jig capable of easily and easily inspecting the wiring condition such as the presence / absence of misconnection between the ground electrode of the transformer and the grounded electrode of the distribution board.
【０００２】[0002]
【従来の技術】オフィス・ビルディング内に設置した単
相交流で作動させるＯＡ機器の金属製の台および筐体
は、接地抵抗が所定値以下となるように接地しなければ
ならない（Ｅ3接地）と電気設備技術基準に規定されて
いる。そのため、建家内の分電盤に接地抵抗が所定値以
下となるように接地した電極を設置し、この分電盤の接
地極から各ＯＡ機器に駆動電源を接続するための接地極
付電源コンセントの接地極に至る配線が設けられてい
る。一方、上記分電盤に電力を供給する単相変圧器に対
しては、その出力側の一方の極を、その電位が接地電位
から所定値以上変動しないように接地する（Ｅ2接地）
ことが電気設備技術基準に規定されている。2. Description of the Related Art A metal base and a casing of an OA device installed in an office building and operated by a single-phase alternating current must be grounded so that a ground resistance is equal to or lower than a predetermined value (E 3 ground). It is stipulated in the electrical equipment technical standards. Therefore, install a grounded electrode on the distribution board in the building so that the grounding resistance is below a specified value, and connect the drive power supply from the grounding electrode of this distribution board to each OA equipment. Wiring to the ground electrode of is provided. On the other hand, for the single-phase transformer that supplies power to the distribution board, one of its output-side poles is grounded so that its potential does not fluctuate more than a predetermined value from the ground potential (E 2 ground).
That is stipulated in the electrical equipment technical standards.
【０００３】図４は正しく配線された接地極付電源コン
セントの配線状態の例を示す図で、図中、１は単相１０
０Ｖ変圧器、２は分電盤、３は接地極付電源コンセント
で、分電盤のＵ極はどこでも接地されておらず、分電盤
のＶ極は変圧器のＥ2接地した極に接続されており、分
電盤のＧ極は変圧器には接続されておらず分電盤の位置
でＥ3接地されている。FIG. 4 is a diagram showing an example of the wiring state of a properly wired power outlet with a grounding electrode, in which 1 is a single phase 10
0V transformer, 2 is a distribution board, 3 is a power outlet with a grounding electrode, the U pole of the distribution board is not grounded anywhere, and the V pole of the distribution board is connected to the E 2 grounded pole of the transformer The G pole of the distribution board is not connected to the transformer and is grounded at E 3 at the position of the distribution board.
【０００４】接地極付電源コンセントの各極を、それぞ
れ、分電盤のＵ、Ｖ、Ｇ極に正しく接続しなければなら
ないが、実際には、それぞれ、分電盤のＵ極、Ｖ極、Ｇ
極に接続され、コンセント取付け位置まで延ばして来た
配線を確実に弁別して、コンセントの極に正しく接続す
るのは容易ではない。もし誤った接続をすると、ＯＡ機
器の焼損事故を生じたり、機器が誤動作したりする原因
となる。The respective poles of the power outlet with a ground electrode must be correctly connected to the U, V, and G poles of the distribution board, but in reality, they are the U pole, V pole, and G
It is not easy to reliably discriminate the wires that have been connected to the poles and have extended to the outlet mounting position, and to correctly connect them to the outlet poles. If incorrect connection is made, it may cause a burnout accident of the office automation equipment or a malfunction of the equipment.
【０００５】従って、従来から分電盤から接地極付電源
コンセントのところまで延ばして来た配線が、実際に分
電盤のＵ、Ｖ、Ｇの何れの極に接続されているかを、検
査、確認してから、それぞれコンセントの該当極に接続
する、或いは一応コンセントの各極に接続した配線が正
しいか否かを検査するようにしていた。Therefore, it is necessary to inspect whether the wiring that has conventionally been extended from the distribution board to the power outlet with a ground electrode is actually connected to the U, V or G pole of the distribution board. After checking, it was to connect to the corresponding pole of the outlet, or to check whether the wiring connected to each pole of the outlet is correct.
【０００６】[0006]
【発明が解決しようとする課題】従来は、接地極付電源
コンセントへの配線接続状態を検査するのに、一般に、
所謂テスターを使用していた。例えば、分電盤から延ば
してきた配線の電位と、コンセントの付近で接地電位に
近い電位にあるもの例えば建家の床との電位差をテスタ
ーで調べたとき、かなり大きな電位差があるのは、分電
盤のＵ極からの配線だけであるから、直ぐ判る。しか
し、Ｖ極に接続された線か、Ｇ極に接続された線かを弁
別するのは、簡単ではない。そのため、従来もこれを弁
別できるようにした特別のテスターが市販されていた
が、検査工数が多くなるとか、テスト用に流す電流値が
大きくて近年分電盤に良く取付けられるようになった漏
電遮断器を動作させて停電させてしまう恐れがあるなど
の問題があった。Conventionally, in order to inspect the wiring connection state to a power outlet with a ground electrode, generally,
I used a so-called tester. For example, when the potential difference between the potential of the wiring extended from the distribution board and the potential near the outlet near the ground potential, such as the floor of the building, is examined with a tester, there is a significant potential difference. The wiring is only from the U pole of the switchboard, so you can see it immediately. However, it is not easy to discriminate between the line connected to the V pole and the line connected to the G pole. For that reason, a special tester that can distinguish this has been commercially available in the past, but due to the increase in the number of inspection steps and the large current value sent for testing, it has become possible to install it on the distribution board in recent years. There were problems such as the possibility of operating the breaker and causing a power failure.
【０００７】本出願人は、上記問題を解決するために、
既に特願平２−２８８４８４号で接地極付電源コンセン
トの配線状態検査治具について提案したが、実際に種々
の状態で試用してみると、Ｖ極とＧ極の間に別電源から
の漏洩によると思われる地電位が存在している場合など
に両電極の弁別能力が不足することがあるとか、一部に
製作し難い点やときどき誤動作する場合があるなどの問
題が判明した。In order to solve the above problems, the present applicant has
Japanese Patent Application No. 2-288484 has already proposed a jig for inspecting the wiring condition of a power outlet with a ground electrode, but when actually tried in various conditions, it leaked from another power source between the V pole and the G pole. It was found that there are cases where the discriminating ability of both electrodes is insufficient, such as when there is a ground potential that is thought to be due to the above, that it is difficult to manufacture in part, and sometimes it malfunctions.
【０００８】本発明は、上記従来の諸問題を解決し、Ｖ
極、Ｇ極からの配線を弁別するための高い能力を有し、
操作が容易、安全で、かつ実際の製作も、安価で性能の
良い市販電子部品を利用して容易に実行できる接地極付
電源コンセントの配線状態検査治具を提供することを目
的とする。The present invention solves the above-mentioned various problems of the related art, and
It has a high ability to distinguish the wiring from the pole and the G pole,
It is an object of the present invention to provide a wiring condition inspection jig for a power outlet with a ground electrode that is easy to operate, safe, and can be easily manufactured by using commercially available electronic components that are inexpensive and have good performance.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に本発明においては、それぞれ分電盤の、単相交流電源
の変圧器の接地してない極に接続されたＵ極、変圧器の
接地極に接続されたＶ極、変圧器には接続されておらず
分電盤で接地したＧ極、に接続されるべき接地極付電源
コンセントの各極を、前記分電盤各極からの実際の配線
に正しく接続するために、先ず前記実際の各配線間の電
圧を調べて、他の２線の何れとの間でも、大きい電圧を
示す線をＵ極に接続された線と見做し、次にＵ極に接続
されていると見做した線から残り２線の何れを通って電
流が流れ易いかを活線状態（分電盤からの配線に交流１
００Ｖが印加されている状態）で調べて、電流が流れ易
い方をＶ極に接続された線、電流が流れ難い方をＧ極に
接続された線と判定するようにした接地極付電源コンセ
ントの配線状態検査治具において、検査治具を使用する
際に使用者が接触する又は接触する恐れのある個所には
１ＭΩ以上の直列抵抗が接続されていて人体に流れる電
流が無害に制限され、更に、Ｖ極に接続された線かＧ極
接続された線かを弁別する回路を、別電源からの漏洩に
よりＶ、Ｇ２極間に生じている恐れのある地電位の影響
を補償した状態で、Ｕ極に接続されていると見做した線
から残り２線の何れを通って電流が流れ易いかの差を抵
抗差分１Ωに対応するまで弁別可能に形成した。また、
治具使用時に接地個所を通って流れる交流電流を３ｍＡ
以下に抑制して漏電遮断器の誤動作による停電を防止
し、Ｖ、Ｇ極に接続された線を弁別する回路の電源とし
て、前記２極とＵ極との間に印加される交流電源の電圧
を半波整流して用い、接地抵抗差分に対応する測定値へ
の交流分の影響を低域フィルタにより除去するようにし
た。In order to achieve the above object, in the present invention, the U pole and the transformer connected to the non-grounded pole of the transformer of the single-phase AC power supply, respectively, of the distribution board Connect each pole of the power outlet with a grounding pole to be connected to the V pole connected to the grounding pole and the G pole not connected to the transformer and grounded by the distribution board from the distribution board. In order to properly connect to the actual wiring, first, the voltage between the respective actual wirings is examined, and a line showing a large voltage between any of the other two lines is regarded as a line connected to the U pole. Then, determine which of the two remaining wires from the wire considered to be connected to the U pole, through which the current is likely to flow, in the live line state (AC 1 for wiring from the distribution board).
00V is applied), and the power outlet with a grounding pole is designed to determine that the one with the easier current flow is the line connected to the V pole and the one with the less current flow is the line connected to the G pole In the wiring condition inspection jig, a series resistance of 1 MΩ or more is connected to a portion where a user comes into contact or may come into contact when the inspection jig is used, and the current flowing through the human body is harmlessly limited. In addition, a circuit for discriminating between the line connected to the V pole and the line connected to the G pole is used in a state in which the influence of the ground potential that may occur between the V and G2 poles due to leakage from another power source is compensated. , The difference between which of the two wires considered to be connected to the U pole and the remaining two wires, through which the current easily flows, is discriminable until the resistance difference corresponds to 1Ω. Also,
AC current flowing through the grounding point when using a jig is 3 mA
The voltage of the AC power supply applied between the two poles and the U pole as a power supply of the circuit for suppressing the power failure due to the malfunction of the earth leakage breaker and discriminating the lines connected to the V and G poles by suppressing the voltage below. Is used after half-wave rectification, and the effect of AC component on the measured value corresponding to the ground resistance difference is removed by a low-pass filter.
【００１０】[0010]
【作用】実際には、分電盤からの配線を接地極付コンセ
ントに一応接続してしまってから、本発明の治具でその
接続が正しいか否か検査する場合も多いが、その場合に
誤配線が発見されたときは配線をやり直すことになるの
で、コンセントに接続する前に、あらかじめ配線自体に
ついて、分電盤のどの極に接続されている線かを調べる
ものとして説明した。Actually, in many cases, after the wiring from the distribution board is once connected to the outlet with the ground electrode, it is often checked whether or not the connection is correct by the jig of the present invention. If incorrect wiring is found, the wiring will be redone. Therefore, before connecting to the outlet, the wiring itself was explained as to check which pole of the distribution board is connected to the wiring.
【００１１】本発明の治具では、交流１００Ｖ（又は２
００Ｖ）の電圧が印加されている線を扱うが、測定作業
中に、たとえ使用者がＵ極とほぼ同電位の活きた部分
（電池交換時に触れる恐れのある部分も含む）に触れた
としても、どこでも直列抵抗が１ＭΩ以上となるように
設定されているため、人体を通って接地部位へ流れる電
流の値が小さく、作業中に不快感はなく、極めて安全で
ある。In the jig of the present invention, AC 100V (or 2
The line to which the voltage of 00V) is applied is handled, but even if the user touches a live part (including a part that may be touched when replacing the battery) with almost the same potential as the U pole during the measurement work. Since the series resistance is set to 1 MΩ or more everywhere, the value of the current flowing through the human body to the grounded portion is small, there is no discomfort during work, and it is extremely safe.
【００１２】上記のように安全な測定回路により、先ず
３本の配線間の電圧を測定し、他の２線の何れに対して
も電圧の高い線をＵ極に接続された線と見做す（又は相
互間の電圧が小さい２線をＶ極やＧ極に接続された線、
残りの線をＵ極に接続された線と見做す）。このための
入力電圧測定には、Ｖ、Ｇ極の何れに接続した線かを弁
別するための抵抗差分検出部とは分離絶縁した電圧直読
回路を用い、数値表示にはＬＣＤによりディジタル表示
を行う市販の電子素子を利用した。With the safe measuring circuit as described above, first, the voltage between the three wires is measured, and the wire having a higher voltage than any of the other two wires is regarded as the wire connected to the U pole. (Or two wires with a small voltage between them are connected to the V and G poles,
The remaining wire is considered to be the wire connected to the U pole). To measure the input voltage for this purpose, a voltage direct reading circuit, which is isolated from the resistance difference detection unit for discriminating which line is connected to the V or G pole, is used, and the numerical display is digitally displayed on the LCD. A commercially available electronic device was used.
【００１３】Ｕ極に接続された線が特定できれば、この
線から残り２線の中のどちらを通って電流が流れ易いか
を調べて、電流の流れ易い方をＶ極に接続された線であ
ると判定する（接地抵抗差分検出）ことになるが、既述
の如く、Ｖ極とＧ極の間に、別電源からの漏洩に起因す
ると思われる地電位が生じている場合が経験された。地
電位の実際の値は、多くの実測結果に余裕を見込んで
も、直流分±１．４Ｖ、交流分（商用周波数および高周
波）３．２ＶP-Pと見れば良いことが分かった。接地抵
抗の差が非常に小さい場合には測定不能になる。本発明
の治具では、抵抗差分１Ωまで検出できるようにした。
１Ω以下の差しかなく判定不能の場合は、第一に分電盤
のＧ極が変圧器の接地極と接地極を共有している場合、
第二に大地との電気抵抗が１Ω以下の値を保っている建
物の鉄骨その他の金属体を分電盤のＧ極と変圧器の接地
極に用いている場合、第三に変圧器の接地極（Ｅ2接
地）と分電盤の接地極（Ｅ3接地）との間の大地間電気
抵抗が１Ω以下の場合である。第一と第二の場合は、い
ずれも特殊な接地方法であり、ＯＡ機器用電源工事全体
に占める割合は僅かである。また、第三の場合は、銅板
を埋設するなどの特殊な接地工法を用いない限りありえ
ない。本治具で判定不能となった場合は、従来通りＧ極
から接地極付電源コンセントまで床上に工事用仮配線を
する方法で弁別できる。If the line connected to the U pole can be identified, which of the remaining two lines the current is likely to flow through is checked, and the line with the easier current flow is determined by the line connected to the V pole. It is determined that there is (grounding resistance difference detection), but as described above, there was a case where a ground potential that is thought to be due to leakage from another power source was generated between the V pole and the G pole. .. It was found that the actual value of the ground potential should be regarded as ± 1.4 V for the direct current component and 3.2 V PP for the alternating current component (commercial frequency and high frequency) even if a margin is taken into account in many actual measurement results. If the difference in ground resistance is very small, measurement becomes impossible. With the jig of the present invention, a resistance difference of 1Ω can be detected.
If the judgment cannot be made without a difference of 1Ω or less, firstly, if the G pole of the distribution board shares the ground pole with the ground pole of the transformer,
Secondly, when the steel frame or other metal body of the building whose electric resistance with the ground is 1Ω or less is used for the G pole of the distribution board and the grounding pole of the transformer, the third is the grounding of the transformer. This is the case where the earth-to-ground electrical resistance between the pole (E 2 ground) and the grounding pole (E 3 ground) of the distribution board is 1Ω or less. In the first and second cases, both are special grounding methods, and their share in the total power supply work for OA equipment is small. In the third case, it is impossible unless a special grounding method such as burying a copper plate is used. If it is not possible to make a judgment with this jig, it can be discriminated by the method of temporary wiring for construction on the floor from the G pole to the power outlet with a ground electrode as in the conventional case.
【００１４】今日では、性能価格比の良好な、ＩＣを含
む各種部品が市販されているので、それらを適宜選別し
て使用することにより、本発明治具自体の性能価格比を
十分良好にすることができた。Since various parts including ICs having a good performance price ratio are on the market today, the performance price ratio of the jig itself of the present invention can be made sufficiently good by appropriately selecting and using them. I was able to do it.
【００１５】[0015]
【実施例】図１は本発明を実施した接地極付コンセント
の配線状態検査治具の概略構成を示すブロック図、図２
はＵ極から配線抵抗、検出抵抗を通ってＶ極へ、同じく
Ｕ極から検出抵抗、配線抵抗、Ｅ2接地極とＥ3接地極で
の接地抵抗を通り、別電源からの漏洩による地電位の影
響下に、Ｇ極へ直流（実際は半波整流）を流して、電流
の流れ易い方をＶ極と判定するようにしたＶ極とＧ極と
を弁別する回路の原理を説明するための図である。端子
Ａ1、Ａ2、Ａ3は、それぞれ、Ｕ極、Ｖ極、Ｇ極に接続
された線に接続するのが原則であって、入力電圧測定部
や接地抵抗差分検出部により測定して、そうでない（誤
接続状態）ことが判ったときは、接続を改めることとす
る。治具の側では、実際にはＵ極に接続された線を、Ａ
2端子またはＡ3端子に接続してしまうなどの誤接続をし
て、交流の高い電圧（実際には１００Ｖ又は２００Ｖ）
が上記端子の何れかに印加された場合でも、低電圧にし
か耐えられない高感度素子や部材たとえば演算増幅器に
焼損事故が生じないように、其の入力部にダイオードを
双方向に接続して、実際にはダイオードの順方向導通時
の電圧降下より大きい電圧は演算増幅器に印加されない
ようにして保護している。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a schematic structure of a wiring condition inspection jig for an outlet with a ground electrode according to the present invention.
Is from the U pole to the V pole through the wiring resistance and the detection resistance, and from the U pole through the detection resistance, wiring resistance, and the ground resistance at the E 2 ground pole and E 3 ground pole, and the ground potential due to leakage from another power source. To explain the principle of a circuit for discriminating between a V pole and a G pole, in which a direct current (actually, half-wave rectification) is caused to flow to the G pole under the influence of, and the one in which the current easily flows is determined to be the V pole. It is a figure. In principle, terminals A 1 , A 2 and A 3 should be connected to the wires connected to the U pole, V pole and G pole respectively, and should be measured by the input voltage measurement unit and the ground resistance difference detection unit. , If it is found that it is not (misconnection), the connection shall be changed. On the side of the jig, actually connect the wire connected to the U pole to
High AC voltage (actually 100V or 200V) due to incorrect connection such as connecting to 2 terminals or A 3 terminal
Is applied to any of the above terminals, a diode is bidirectionally connected to the input section so that a high-sensitivity element or member that can withstand only low voltage, such as an operational amplifier, will not be damaged by fire. Actually, a voltage larger than the voltage drop at the time of forward conduction of the diode is protected by being not applied to the operational amplifier.
【００１６】入力部では入力のハンドリング、即ち、各
端子間の入力電圧を測定するための状態にするか、又
は、Ｖ、Ｇ極に接続された線の間の接地抵抗差分の検出
を行うための状態にするかなど、を切り換える。接地抵
抗差分検出部の回路は、Ａ1、Ａ2、Ａ3端子との間を、
制御部や状態表示部（Ｖ、Ｇ極に正しく接続されている
か否か、抵抗差が１Ω以下で検出不能だとかの表示）の
ための直流電源が接続され測定可能な状態になってから
接続されるように、直流電源により点灯されるＬＥＤと
其の発光に応じて動作するリレーによって、先ずＡ2、
Ａ3との間が、次にＡ1との間も接続されるように開閉が
制御される。In the input section, in order to handle the input, that is, to set the state for measuring the input voltage between the terminals, or to detect the ground resistance difference between the lines connected to the V and G poles. Select whether or not to switch to. The circuit of the ground resistance difference detection unit has terminals A 1 , A 2 , and A 3
Connected after the DC power supply for the control unit and status display unit (whether it is correctly connected to the V and G poles, indicating that the resistance difference is less than 1Ω and undetectable) is connected and ready for measurement As described above, by using the LED that is turned on by the DC power source and the relay that operates according to the light emission, first, A 2 ,
The opening / closing is controlled so that the connection with A 3 and the connection with A 1 are made next.
【００１７】接地抵抗差分検出部では、先ずＡ1端子と
の間が遮断された状態で、Ｖ、Ｇ極（接続線）間の電位
差の直流分を測定し（交流分があっても低域フィルタで
除去される）、それが補償され零となるように地電位の
直流分補償回路を調整する。次にＡ1端子（従ってＵ極
接続線）が接続された状態で、Ｕ極に接続した線から他
の２線（Ｖ極接続線、Ｇ極接続線）の何れを通って電流
が流れ易いかを、Ｕ極に印加された交流を半波整流した
電圧を直流電源にして調べる。こうすると、上記他の２
線を通って流れる電流には交流分が含まれるが、そのた
めの電圧変動は低域フィルタ（２次バターワース型アク
ティブフィルタで、カットオフ周波数は０．５Ｈｚ）で
除去、補償して、同じ大きさの検出抵抗内に生ずる電圧
の相違を、直流電圧で、どちらの極の接地抵抗が大きい
か小さいかを１Ωの差に対応する精度で測定できるよう
にしてある。In the grounding resistance difference detecting section, first, the DC component of the potential difference between the V and G poles (connection line) is measured in a state where the A 1 terminal is cut off (even if there is an AC component, it is in the low range). Then, the DC compensation circuit of the ground potential is adjusted so that it is compensated and becomes zero. Next, with the A 1 terminal (and therefore the U pole connecting line) connected, a current easily flows from the line connected to the U pole through any of the other two lines (V pole connecting line and G pole connecting line). Whether or not the alternating current applied to the U pole is half-wave rectified is used as a direct current power source and checked. By doing this, other than the above 2
The current flowing through the line contains an AC component, but voltage fluctuations due to that are removed and compensated by a low-pass filter (a second-order Butterworth active filter with a cut-off frequency of 0.5 Hz) to ensure the same magnitude. The difference in the voltage generated in the detection resistor can be measured with a DC voltage to determine which pole the ground resistance is large or small with an accuracy corresponding to the difference of 1Ω.
【００１８】Ｖ線、Ｇ線結線判定部は、Ｖ極、Ｇ極の接
地抵抗の差分を５０ｍＶ／Ωに増幅して出力する。その
出力電位はコンパレータで中立電位と比較され、分電盤
のＶ極に接続した線が正しく治具のＡ2端子に、Ｇ極に
接続した線が正しくＡ3端子に接続されているか、否
か、またはＶ極とＧ極の接地抵抗差が１Ω以下で判別不
能かを、制御部を介して状態表示部の３個のＬＥＤによ
り、それぞれの場合を区別して判り易く表示させる。The V-line / G-line connection determination unit amplifies and outputs the difference between the ground resistances of the V-pole and the G-pole to 50 mV / Ω. The output potential is compared with the neutral potential by the comparator, and the line connected to the V pole of the distribution board is correctly connected to the A 2 terminal of the jig, and the line connected to the G pole is correctly connected to the A 3 terminal. Whether or not the ground resistance difference between the V pole and the G pole is 1 Ω or less cannot be discriminated is displayed by the three LEDs of the status display section through the control section so that each case can be discriminated in an easy-to-understand manner.
【００１９】入力電圧測定部は、スイッチで選択したコ
ンセント端子間の電圧を１／１００のレベルで出力し、
それを市販ＩＣよりなるＲＭＳコンバータで、端子間電
圧の真の実効値に相当する直流レベル（１ＶＤＣ／１０
０ＶＡＣ）に変換して、市販のＬＣＤ表示器で最小値
０．０Ｖから最大値１９９．９Ｖまで読み取る。既述の
ように、この治具の使用に際しては、まずＵ極に接続さ
れた線を見付けなければならないから、この入力電圧測
定部で、そのための作業を最初に行う、Ｕ極に接続した
線が見付かれば、残り２線は、それぞれＶ極とＧ極の何
れか一方に接続されていることが確実になる。それか
ら、Ｖ、Ｇ２極に対する接地抵抗差分検出の作業を進め
ることになる。数値表示部は既述のように、ディジタル
表示を行うＬＣＤを備え、端子間の入力電圧を表示す
る。Ｖ極とＧ極に対する接地抵抗の差を検出するのに先
立って、まず上記２極間の電圧を測定し、これら２極間
に表れる別電源からの漏洩による地電位直流分の除去、
補償を行う際にも、やはり数値表示部を利用する。数値
表示部がＡ／Ｄ変換器を内臓することは勿論である。The input voltage measuring unit outputs the voltage between the outlet terminals selected by the switch at a level of 1/100,
An RMS converter composed of a commercially available IC is used to measure the DC level (1VDC / 10) corresponding to the true effective value of the voltage between terminals.
0 VAC) and read on a commercial LCD display from a minimum value of 0.0V to a maximum value of 199.9V. As described above, when using this jig, it is necessary to first find the wire connected to the U pole. Therefore, in this input voltage measurement unit, the work for that purpose is performed first. If it is found, it is ensured that the remaining two wires are respectively connected to either the V pole or the G pole. Then, the work of detecting the difference in ground resistance with respect to the V and G2 poles is advanced. As described above, the numerical display unit has an LCD for digital display and displays the input voltage between the terminals. Prior to detecting the difference in ground resistance between the V pole and the G pole, first, the voltage between the two poles is measured, and the ground potential DC component is removed by leakage from another power source that appears between these two poles.
The numerical display is also used for compensation. It goes without saying that the numerical value display unit incorporates an A / D converter.
【００２０】電源部は、本治具の各部の動作に必要な、
安定化した直流電圧を発生する。この実施例では、単３
マンガン乾電池４本から±５Ｖの電圧を発生している。
なお、本治具は、１回の電池交換で、連続５０時間以上
動作する。The power supply unit is necessary for the operation of each unit of this jig.
Generates a stable DC voltage. In this example, AA
A voltage of ± 5 V is generated from four manganese dry batteries.
The jig operates continuously for 50 hours or more with one battery exchange.
【００２１】図３は本発明治具の一実施例の詳細な回路
の要部のみを示す図である。FIG. 3 is a diagram showing only a main part of a detailed circuit of an embodiment of the jig of the present invention.
【００２２】[0022]
【発明の効果】以上説明したように本発明によれば、分
電盤から接地極付電源コンセントに至る配線がコンセン
トの各極に正しく接続されているか否かを、安全かつ容
易に検査できる性能価格比良好な検査治具が得られる。As described above, according to the present invention, it is possible to safely and easily inspect whether or not the wiring from the distribution board to the power outlet with a ground electrode is properly connected to each pole of the outlet. An inspection jig with a good price ratio can be obtained.
【図１】本発明を実施した接地極付コンセントの配線状
態検査治具の概略構成を示すブロック図である。FIG. 1 is a block diagram showing a schematic configuration of a wiring state inspection jig for an outlet with a grounding electrode according to the present invention.
【図２】Ｕ極に接続された線から電流を流して見たと
き、電流が流れ易い方の線がＶ極に接続された線である
と弁別、判定する原理を説明する図である。FIG. 2 is a diagram illustrating a principle of discriminating and determining that a line in which a current easily flows is a line connected to a V pole when a current is viewed from a line connected to a U pole.
【図３】本発明治具の一実施例の詳細な回路の要部のみ
を示す図である。FIG. 3 is a diagram showing only a main part of a detailed circuit of an embodiment of a jig of the present invention.
【図４】正しく配線された接地極付電源コンセントの配
線状態の例を示す図である。FIG. 4 is a diagram showing an example of a wiring state of a correctly wired power outlet with a ground electrode.
１…単相１００Ｖ変圧器、 ２…分電盤、 ３…接地極
付電源コンセント、Ｕ極…単相交流電源の変圧器の接地
してない極に接続された分電盤の極 Ｖ極…変圧器の接地極に接続された分電盤の極 Ｇ極…変圧器には接続されておらず分電盤で接地した分
電盤の極1 ... Single-phase 100V transformer, 2 ... Distribution board, 3 ... Power outlet with grounding electrode, U pole ... Distribution board pole V pole connected to ungrounded pole of transformer of single-phase AC power supply ... Distribution board pole connected to the grounding pole of the transformer G pole: Distribution board pole not connected to the transformer and grounded by the distribution board
Claims (3)
の接地してない極に接続されたＵ極、変圧器の接地極に
接続されたＶ極、変圧器には接続されておらず分電盤で
接地したＧ極、に接続されるべき接地極付電源コンセン
トの各極を、前記分電盤各極からの実際の配線に正しく
接続するために、先ず前記実際の各配線間の電圧を調べ
て、他の２線の何れとの間でも、大きい電圧を示す線を
Ｕ極に接続された線と見做し、次にＵ極に接続されてい
ると見做した線から残り２線の何れを通って電流が流れ
易いかを活線状態で調べて、電流が流れ易い方をＶ極に
接続された線、電流が流れ難い方をＧ極に接続された線
と判定するようにした接地極付電源コンセントの配線状
態検査治具において、検査治具を使用する際に使用者が
接触する又は接触する恐れのある個所には１ＭΩ以上の
直列抵抗が接続されていて人体に流れる電流が無害に制
限され、更に、Ｖ極に接続された線かＧ極に接続された
線かを弁別する回路を、別電源からの漏洩によりＶ、Ｇ
２極間に生じている恐れのある地電位の影響を補償した
状態で、Ｕ極に接続されていると見做した線から残り２
線の何れを通って電流が流れ易いかの差を抵抗差分１Ω
に対応するまで弁別可能に形成したことを特徴とする接
地極付電源コンセントの配線状態検査治具。1. A U-pole connected to a non-grounded pole of a transformer of a single-phase AC power supply, a V-pole connected to a grounding pole of a transformer, and a transformer of a distribution board, respectively. First, in order to properly connect the respective poles of the power outlet with a grounding electrode to be connected to the G pole, which is grounded in the distribution board, to the actual wirings from the respective poles of the distribution board, first, the respective actual wirings. By checking the voltage between them, the line showing a large voltage between any of the other two lines is regarded as the line connected to the U pole, and then the line considered to be connected to the U pole. From the two remaining lines, it is checked through which line the current easily flows, in the live line state, the one in which the current easily flows is the line connected to the V pole, and the one in which the current hardly flows is the line connected to the G pole. In the wiring condition inspection jig of the power outlet with a grounding electrode that is judged, the user touches or touches when using the inspection jig. A series resistance of 1 MΩ or more is connected to the location where there is a risk that the current flowing in the human body will be harmlessly limited, and a circuit that distinguishes between the line connected to the V pole and the line connected to the G pole will be provided. , V, G due to leakage from another power source
The remaining 2 from the line that is considered to be connected to the U pole while compensating for the effect of the ground potential that may occur between the 2 poles.
The difference in which line the current easily flows through is the resistance difference of 1Ω
A wiring condition inspection jig for a power outlet with a grounding electrode, which is characterized in that it can be discriminated until it is compatible with.
電流を３ｍＡ以下に抑制し分電盤に取付けられた漏電遮
断器を動作させないようにしたことを特徴とする請求項
１記載の接地極付電源コンセントの配線状態検査治具。2. The ground according to claim 1, wherein when the jig is used, the AC current flowing through the grounding point is suppressed to 3 mA or less, and the earth leakage breaker mounted on the distribution board is not operated. Wiring condition inspection jig for power outlets with poles.
電源として、前記２極とＵ極との間に印加される交流電
源の電圧を半波整流して用い、接地抵抗差分に対応する
測定値への交流分の影響を低域フィルタにより除去する
ようにしたことを特徴とする請求項１記載の接地極付電
源コンセントの配線状態検査治具。3. A ground resistance difference is obtained by half-wave rectifying an AC power supply voltage applied between the 2 pole and the U pole as a power supply of a circuit for discriminating wires connected to V and G poles. The wiring condition inspection jig for a power outlet with a ground electrode according to claim 1, wherein the influence of an alternating current component on the measured value corresponding to is removed by a low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4120476A JP2543646B2 (en) | 1992-05-13 | 1992-05-13 | Wiring condition inspection jig for power outlet with grounding electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4120476A JP2543646B2 (en) | 1992-05-13 | 1992-05-13 | Wiring condition inspection jig for power outlet with grounding electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05312878A true JPH05312878A (en) | 1993-11-26 |
| JP2543646B2 JP2543646B2 (en) | 1996-10-16 |
Family
ID=14787123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4120476A Expired - Lifetime JP2543646B2 (en) | 1992-05-13 | 1992-05-13 | Wiring condition inspection jig for power outlet with grounding electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2543646B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007278751A (en) * | 2006-04-04 | 2007-10-25 | Kandenko Co Ltd | Improper connection decision method for ground-electrode-equipped socket and improper connection decision tester for ground-electrode-equipped socket |
| WO2010100754A1 (en) * | 2009-03-06 | 2010-09-10 | ボッシュ株式会社 | Detection system and electric system |
| JP2012255712A (en) * | 2011-06-08 | 2012-12-27 | Kyoritsu Electrical Instruments Works Ltd | Wiring confirmation tester and method for receptacle with grounding electrode |
-
1992
- 1992-05-13 JP JP4120476A patent/JP2543646B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007278751A (en) * | 2006-04-04 | 2007-10-25 | Kandenko Co Ltd | Improper connection decision method for ground-electrode-equipped socket and improper connection decision tester for ground-electrode-equipped socket |
| WO2010100754A1 (en) * | 2009-03-06 | 2010-09-10 | ボッシュ株式会社 | Detection system and electric system |
| JPWO2010100754A1 (en) * | 2009-03-06 | 2012-09-06 | ボッシュ株式会社 | Detection system and electrical system |
| JP2012255712A (en) * | 2011-06-08 | 2012-12-27 | Kyoritsu Electrical Instruments Works Ltd | Wiring confirmation tester and method for receptacle with grounding electrode |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2543646B2 (en) | 1996-10-16 |
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