JPH074596Y2 - Equipment grounding test equipment - Google Patents
Equipment grounding test equipmentInfo
- Publication number
- JPH074596Y2 JPH074596Y2 JP1987130424U JP13042487U JPH074596Y2 JP H074596 Y2 JPH074596 Y2 JP H074596Y2 JP 1987130424 U JP1987130424 U JP 1987130424U JP 13042487 U JP13042487 U JP 13042487U JP H074596 Y2 JPH074596 Y2 JP H074596Y2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- voltage
- under test
- converter
- comparator
- 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.)
- Expired - Lifetime
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
【考案の詳細な説明】 A.産業上の利用分野 この考案は機器の接地状態試験装置に関する。[Detailed Description of Device] A. Field of Industrial Application This device relates to a grounding state test device for equipment.
B.考案の概要 この考案は機器の接地状態試験装置において、 被試験機器の接地端子部位の接触抵抗が一定の規格内に
あるか否かを小電流でかつ短時間で判断できるようにし
たことにより、 被試験機器の接地端子の接触抵抗の良否判定が極めて短
時間かつコンパクトの設備で試験できるようにしたもの
である。B. Outline of the Invention This device is designed to enable a grounding condition tester for equipment to judge whether the contact resistance of the ground terminal portion of the equipment under test is within a certain standard with a small current and in a short time. This makes it possible to judge whether the contact resistance of the ground terminal of the device under test is good or bad in an extremely short time and with compact equipment.
C.従来の技術 第３図は従来の機器の接地状態試験装置の回路図で、１
は電源、２はスイッチ、３はトランスである。トランス
３の所定のタップに電流計４の一端を接続し、その他端
を抵抗５を介して被試験機器６の端子6aに接続する。被
試験機器６の接地端子6bは接地母線７に接続される。８
は電圧計である。C. Conventional Technology FIG. 3 is a circuit diagram of a conventional grounding condition test device for equipment.
Is a power supply, 2 is a switch, and 3 is a transformer. One end of the ammeter 4 is connected to a predetermined tap of the transformer 3 and the other end is connected to the terminal 6a of the device under test 6 via the resistor 5. The ground terminal 6b of the device under test 6 is connected to the ground bus bar 7. 8
Is a voltmeter.
前記被試験機器６としては例えば第４図に示すような金
属製のプリント基板収納ユニット61を一例にとって述べ
る。ユニットの底部には図示しないがマザーボードが取
り付けてあり、このマザーボードに、ユニット61の図示
開口部から複数枚のプリント基板（図示省略）が着脱自
在に配装される。ユニット61の上端辺の長手方向には鍔
62,63が設けられ、鍔62の所定個所にはボルト締めによ
る接地端子6bが設けられている。64はプリント基板に取
り付けられている化粧板等の部材で、この部材64は鍔6
2,63にボルト等で固定される。第４図では被試験機器６
の端子6aを鍔62に取り付けて、端子6a,6b間に電流を流
して接地端子6bの接触抵抗の良否を判定する。As the device under test 6, a metal printed circuit board storage unit 61 as shown in FIG. 4 will be described as an example. Although not shown, a mother board is attached to the bottom of the unit, and a plurality of printed circuit boards (not shown) are detachably mounted on the mother board through the illustrated openings of the unit 61. The upper edge of the unit 61 has a brim in the longitudinal direction.
62 and 63 are provided, and a ground terminal 6b is provided at a predetermined portion of the collar 62 by bolting. 64 is a member such as a decorative plate attached to the printed circuit board. This member 64 is a collar 6
It is fixed to 2,63 with bolts. In FIG. 4, the device under test 6
The terminal 6a is attached to the collar 62, and a current is passed between the terminals 6a and 6b to judge whether the contact resistance of the ground terminal 6b is good or bad.
上記被試験機器６の接地端子6bの接触抵抗が予め設定さ
れた規格以下であるかを判定するには、第３図に示す回
路を用いて交流電流の30Aを端子6a,6bに流し、２分後に
両端子6a,6b間の電位差を計測し、規定値以下であるか
どうかによって行っている。In order to determine whether the contact resistance of the ground terminal 6b of the device under test 6 is less than or equal to a preset standard, a circuit shown in FIG. 3 is used to apply an alternating current of 30A to the terminals 6a, 6b and After a minute, the potential difference between both terminals 6a and 6b is measured, and it is determined whether or not it is below a specified value.
D.考案が解決しようとする問題点 第３図に示すような回路を用いて被試験機器の接地端子
の接触抵抗が規定値以下であるかを判定するには試験設
備が大型で、30Aの大電流を流すため、大変危険であ
り、しかも２分という試験時間は長すぎる問題がある。D. Problems to be solved by the device To determine whether the contact resistance of the ground terminal of the device under test is below a specified value using a circuit as shown in Fig. 3, the test equipment is large and the Since a large current is passed, it is very dangerous and the test time of 2 minutes is too long.
E.問題点を解決するための手段 この考案は被試験機器が接続される測定端子と合否判定
基準抵抗を設け、DC/DCコンバータの出力を切替スイッ
チを介して測定端子と合否判定基準抵抗に各別に与え、
切替スイッチを合否判定基準抵抗側に切り替えたとき抵
抗の両端に得られた電圧を基準電圧として比較器に設定
し、前記切替スイッチを測定端子側に切り替えて、被試
験機器にDC/DCコンバータの出力を与えたときの測定端
子間電圧を比較器に設定された基準電圧と比較し、基準
電圧以下のとき比較器の出力に設けられた異常検出部を
動作させるようにしたものである。E. Means for Solving Problems This device is provided with a measurement terminal to which a device under test is connected and a pass / fail judgment reference resistance, and the output of the DC / DC converter is connected to the measurement terminal and the pass / fail judgment reference resistance via a changeover switch. Give each separately,
When the changeover switch is switched to the pass / fail judgment reference resistance side, the voltage obtained at both ends of the resistance is set as a reference voltage in the comparator, and the changeover switch is changed to the measurement terminal side, and the device under test is set to the DC / DC converter. The voltage between the measuring terminals when the output is given is compared with the reference voltage set in the comparator, and the abnormality detection unit provided at the output of the comparator is operated when the voltage is equal to or lower than the reference voltage.
F.作用 接地端子と通電用端子が設けられた被試験機器を測定端
子に接続して接地端子の接地状態を試験する際、DC/DC
コンバータの出力電圧を、最初、合否判定基準抵抗に印
加し、そのときの抵抗の両端電圧を比較器の基準電圧と
して設定する。その後、DC/DCコンバータの出力電圧を
測定端子に印加してそのときの両端電圧を比較器に与え
る。この電圧が基準電圧以上か、未満かを比較器で比較
し、基準電圧以上のとき接地端子の接地状態が不良であ
ると判定した。F. Action When connecting the equipment under test equipped with the grounding terminal and energizing terminal to the measuring terminal and testing the grounding state of the grounding terminal, DC / DC
The output voltage of the converter is first applied to the pass / fail judgment reference resistance, and the voltage across the resistance at that time is set as the reference voltage of the comparator. After that, the output voltage of the DC / DC converter is applied to the measurement terminal, and the voltage at both ends is applied to the comparator. A comparator was used to compare whether this voltage was higher or lower than the reference voltage, and when it was higher than the reference voltage, it was determined that the grounding state of the ground terminal was defective.
G.実施例 以下図面を参照してこの考案の一実施例を説明する。G. Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図において、11はトランス、12は整流器である。整
流器12の出力電圧はDC/DCコンバータ13に与える。DC/DC
コンバータ13の出力端は切替スイッチ14の可動接点14a
に接続するとともに抵抗15を介して比較器16のマイナス
端に接続される。切替スイッチ14の第１固定接点14bは
合否判定基準抵抗17（抵抗値0.1Ω）を介して負母線18
に接続される。また切替スイッチ14の第２固定接点14c
は測定端子19を介して負母線18に接続される。比較器16
のプラス端には基準電圧設定用の可変抵抗20が接続され
る。比較器16の出力端は異常検出部を構成するトランジ
スタ21のベースに接続される。トランジスタ21のコレク
タにはリレー22が接続されていて、リレー22の動作によ
って接地端子の接地状態がランプ23,24およびブザー25
によって表示される。In FIG. 1, 11 is a transformer and 12 is a rectifier. The output voltage of the rectifier 12 is given to the DC / DC converter 13. DC / DC
The output end of the converter 13 has a movable contact 14a of the changeover switch 14.
It is also connected to the negative terminal of the comparator 16 via the resistor 15. The first fixed contact 14b of the changeover switch 14 has a negative bus 18 through a pass / fail judgment reference resistance 17 (resistance value 0.1Ω).
Connected to. Also, the second fixed contact 14c of the changeover switch 14
Is connected to the negative bus 18 via a measuring terminal 19. Comparator 16
A variable resistor 20 for setting a reference voltage is connected to the positive end of the. The output terminal of the comparator 16 is connected to the base of the transistor 21 that constitutes the abnormality detection unit. A relay 22 is connected to the collector of the transistor 21, and the operation of the relay 22 changes the ground state of the ground terminal to the lamps 23 and 24 and the buzzer 25.
Displayed by.
第２図は被試験機器６の接地状態試験装置の正面図で、
測定端子19に被試験機器６の端子6aと6bに接続される。FIG. 2 is a front view of the grounding state test device for the device under test 6,
The measuring terminal 19 is connected to the terminals 6a and 6b of the device under test 6.
次に上記実施例の動作を述べる。まず、第２図に示すよ
うに測定端子19に被試験機器６の端子6aと6bを接続す
る。この後、切替スイッチ14の可動接点14aを第１固定
接点14b（CHECK側）に接続し、第２図に示すスタート／
ストップスイッチ26を操作する。スイッチ26が操作され
ると、DC/DCコンバータ13の直流電圧（0.1V）が切替ス
イッチ14を介して合否判定基準抵抗17に印加される。抵
抗17に直流電圧が印加されると、その両端に所定の電圧
が得られる。この電圧は比較器16のマイナス端に入力さ
れる。このとき、可変抵抗20を動かして異常検出部の
「NG」ランプ24から「OK」ランプ23に点灯状態が切替わ
る時点に可変抵抗20を調整する。この調整点が比較器16
の基準電圧となる。Next, the operation of the above embodiment will be described. First, as shown in FIG. 2, the terminals 6a and 6b of the device under test 6 are connected to the measuring terminal 19. After that, the movable contact 14a of the changeover switch 14 is connected to the first fixed contact 14b (CHECK side), and the start / stop shown in FIG.
Operate the stop switch 26. When the switch 26 is operated, the DC voltage (0.1 V) of the DC / DC converter 13 is applied to the pass / fail judgment reference resistor 17 via the changeover switch 14. When a DC voltage is applied to the resistor 17, a predetermined voltage is obtained across the resistor 17. This voltage is input to the negative terminal of the comparator 16. At this time, the variable resistor 20 is moved to adjust the variable resistor 20 at the time when the lighting state is switched from the “NG” lamp 24 to the “OK” lamp 23 of the abnormality detecting section. This adjustment point is the comparator 16
It becomes the reference voltage of.
ここで、切替スイッチ14の可動接点14aを第２固定接点1
4c（TEST側）に切り替え接続し、測定端子19に接続され
た被試験機器６に直流電圧を印加する。このとき比較器
16のマイナス端の電圧が設定された基準電圧以上である
と、比較器16には出力が生じないで異常検出部の「NG」
ランプ24が点灯し、接地状態が不良であることを報知す
る。なお、この場合ブザー25も鳴動する。また、比較器
16のマイナス端の電圧が基準電圧未満のとき、比較器16
から出力が送出され、トランジスタ21がオンとなる。こ
れによりリレー22が動作して「OK」ランプ23が点灯す
る。「OK」ランプ23の点灯から接地状態が良好であるこ
とが判断できる。Here, the movable contact 14a of the changeover switch 14 is connected to the second fixed contact 1
4c (TEST side) is switched and connected, and a DC voltage is applied to the device under test 6 connected to the measurement terminal 19. At this time the comparator
If the voltage at the negative terminal of 16 is higher than the set reference voltage, no output is generated in the comparator 16 and “NG” of the abnormality detection section
The lamp 24 lights up to notify that the grounding state is poor. In this case, the buzzer 25 also sounds. Also, the comparator
When the voltage at the negative terminal of 16 is less than the reference voltage, the comparator 16
The output is sent from and the transistor 21 is turned on. This activates the relay 22 and the "OK" lamp 23 lights up. It can be judged from the lighting of the “OK” lamp 23 that the grounding condition is good.
H.考案の効果 以上述べたように、この考案によれば、被試験機器には
大電流を流すことなく、極めて短時間に接地状態の良否
の判定ができるとともに測定時の電流も小さいため、試
験が安全にできる利点があります。H. Effect of the Invention As described above, according to the present invention, it is possible to judge whether the ground state is good or bad in a very short time without supplying a large current to the device under test, and the current at the time of measurement is small. It has the advantage of making the exam safe.
第１図はこの考案の一実施例を示す回路図、第２図はこ
の考案の接地状態試験装置の正面図、第３図は従来の接
地状態試験装置の回路図、第４図は被試験機器の概略構
成を示す斜視図である。 ６……被試験機器、6a……接地端子、13……DC/DCコン
バータ、14……切替スイッチ、16……比較器、17……合
否判定基準抵抗、19……測定端子、20……可変抵抗、21
……トランジスタ、22……リレー、23……「OK」ラン
プ、24……「NG」ランプ。FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a front view of a grounding state testing device of the present invention, FIG. 3 is a circuit diagram of a conventional grounding state testing device, and FIG. It is a perspective view showing a schematic structure of a device. 6 ... Equipment under test, 6a ... Ground terminal, 13 ... DC / DC converter, 14 ... Changeover switch, 16 ... Comparator, 17 ... Pass / fail judgment reference resistance, 19 ... Measuring terminal, 20 ... Variable resistance, 21
…… Transistor, 22 …… Relay, 23 …… “OK” lamp, 24 …… “NG” lamp.
Claims (1)
隔離れた位置に他の通電用端子が設けられた被試験機器
の接地端子の接地状態を試験するものにおいて、 DC/DCコンバータと、このDC/DCコンバータの出力端と負
母線との間に、切替スイッチにより選択可能に設けられ
た合否判定基準抵抗および被試験機器が接続される測定
端子と、前記DC/DCコンバータの出力端がマイナス端
に、プラス端に基準電圧設定用の可変抵抗が接続され、
合否判定基準抵抗に得られた電圧をマイナス端に与えた
ときに、出力が生じるように可変抵抗を調整して、その
調整点を基準電圧とした比較器と、この比較器の出力端
に接続され、切替スイッチを測定端子側に切り替えたと
き、測定端子に接続された被試験機器に印加した電圧が
前記基準電圧以上になったとき異常であると、また、基
準電圧未満のとき正常であるとする接地状態良否検出部
とからなることを特徴とする機器の接地状態試験装置。1. A DC / DC converter for testing the ground state of a ground terminal of a device under test having a ground terminal and another current-carrying terminal provided at a position spaced apart from the ground terminal by a DC / DC converter. , Between the output terminal of this DC / DC converter and the negative bus bar, the measurement terminal to which the pass / fail judgment reference resistance and the device under test, which are selectably provided by the changeover switch, and the output terminal of the DC / DC converter are connected. Is connected to the minus end and the variable resistor for reference voltage setting is connected to the plus end,
Adjust the variable resistor so that an output will be produced when the voltage obtained by the pass / fail judgment reference resistance is applied to the negative terminal, and connect it to the comparator using the adjustment point as the reference voltage and the output terminal of this comparator. When the changeover switch is switched to the measurement terminal side, it is abnormal when the voltage applied to the device under test connected to the measurement terminal exceeds the reference voltage, and when the voltage is less than the reference voltage, it is normal. A grounding state test device for equipment, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987130424U JPH074596Y2 (en) | 1987-08-27 | 1987-08-27 | Equipment grounding test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987130424U JPH074596Y2 (en) | 1987-08-27 | 1987-08-27 | Equipment grounding test equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6437675U JPS6437675U (en) | 1989-03-07 |
| JPH074596Y2 true JPH074596Y2 (en) | 1995-02-01 |
Family
ID=31385579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987130424U Expired - Lifetime JPH074596Y2 (en) | 1987-08-27 | 1987-08-27 | Equipment grounding test equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074596Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100981046B1 (en) * | 2008-02-13 | 2010-09-10 | 두산중공업 주식회사 | Device for detecting ground fault |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS614973A (en) * | 1984-06-19 | 1986-01-10 | Rohm Co Ltd | Resistance value measuring circuit |
-
1987
- 1987-08-27 JP JP1987130424U patent/JPH074596Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100981046B1 (en) * | 2008-02-13 | 2010-09-10 | 두산중공업 주식회사 | Device for detecting ground fault |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6437675U (en) | 1989-03-07 |
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