JPS6148670B2 - - Google Patents
Info
- Publication number
- JPS6148670B2 JPS6148670B2 JP54133421A JP13342179A JPS6148670B2 JP S6148670 B2 JPS6148670 B2 JP S6148670B2 JP 54133421 A JP54133421 A JP 54133421A JP 13342179 A JP13342179 A JP 13342179A JP S6148670 B2 JPS6148670 B2 JP S6148670B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- transformer
- frequency
- load
- oscillator
- 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
Links
- 238000009413 insulation Methods 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 206010044625 Trichorrhexis Diseases 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【発明の詳細な説明】
本発明は、機器の絶縁抵抗と共に、漏れ電流を
測定することのできる絶縁試験装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation testing device capable of measuring leakage current as well as insulation resistance of equipment.
本発明の絶縁試験装置は、一対のクリツプ式の
変成器を用いて電源ラインをクリツプして絶縁抵
抗を測定すると共に、一方のクリツプ式変成器を
用いることにより、漏れ電流が測定できるように
したものである。以下、図面により本発明を説明
する。 The insulation testing device of the present invention uses a pair of clip-type transformers to clip a power line to measure insulation resistance, and uses one clip-type transformer to measure leakage current. It is something. The present invention will be explained below with reference to the drawings.
第１図は本発明装置の使用状態を示す図で、一
点鎖線で示す部分IMが本発明の測定装置のブロ
ツク図である。第１図において、LOは負荷（機
器）、SOは高圧をAC100Vに変圧する柱上変圧器
PTを含む商用電源回路で、PTの２次側電圧
AC100Vはラインl1，l2を介して負荷LOに供給さ
れている。ラインl2は大地電位となつている。Rx
は負荷LOと大地間に存在する被測定の絶縁抵
抗、Clは同じく容量を示すもので、RxとClには
もれ電源ｉrとｉcが流れる。 FIG. 1 is a diagram showing the state in which the device of the present invention is used, and the portion IM indicated by the dashed line is a block diagram of the measuring device of the present invention. In Figure 1, LO is the load (equipment) and SO is the pole transformer that transforms high voltage to AC100V.
In a commercial power supply circuit that includes a PT, the secondary side voltage of the PT
AC100V is supplied to the load LO via lines l1 and l2 . Line l2 is at ground potential. Rx
is the insulation resistance of the measured object between the load LO and the ground, and Cl is the capacitance, and leakage power sources ir and ic flow through Rx and Cl.
本発明に係る測定装置IMにおいて、CTはクリ
ツプ式変成器で、この変成器は注入用変成器CT1
と、検出用変成器CT2からなつている。変成器
CT1とCT2は共に一対の半円環状のコア１１，１
２，２１，２２を備え、このコアにコイル１３，
２３をそれぞれ巻装して構成したものである。
CT1，CT2間はシールドＳにより磁気的にシール
ドされている。OSCは変成器CT1のコイル１３を
励磁する定電圧発振器で、その発振周波数は商
用周波数に対して十分弁別し得るような値に選ば
れている。BPAはバンドパス・アンプで、周波
数において位相角ずれを生じない増幅器が用い
られている。SRは発振器OSCの出力を搬送波と
してバンドパス・アンプBPAの出力を同期整流
する同期整流回路、LOGは同期整流回路SRの出
力の大きい部分を圧縮して指示計Ｍに加える近似
対数変換回路で、このLOG回路を介することに
より指示計Ｍの目盛は例えば第２図のＭΩで示す
如く対数目盛となる。絶縁抵抗はその値が大幅に
変化するが、上記のように指示計Ｍの目盛を対数
目盛とすることにより、切換スイツチなしで広範
囲の絶縁抵抗を測定することができる。OUTは
アナログ信号出力端子で、同期整流回路SRの出
力端に接続されている。ARは増幅整流回路、
SW1〜SW3は連動する切換スイツチで、それぞれ
絶縁抵抗測定端子ＭΩと漏洩電流測定端子Ioを持
つている。 In the measuring device IM according to the present invention, CT is a clip type transformer, and this transformer is an injection transformer CT 1
and a detection transformer CT 2 . transformer
Both CT 1 and CT 2 are a pair of semicircular cores 11, 1
2, 21, 22, and a coil 13,
23 are wound around each other.
The space between CT 1 and CT 2 is magnetically shielded by a shield S. The OSC is a constant voltage oscillator that excites the coil 13 of the transformer CT 1 , and its oscillation frequency is selected to be sufficiently distinguishable from the commercial frequency. BPA is a bandpass amplifier, which uses an amplifier that does not cause phase angle shift in frequency. SR is a synchronous rectifier circuit that synchronously rectifies the output of the bandpass amplifier BPA using the output of the oscillator OSC as a carrier wave, and LOG is an approximate logarithmic conversion circuit that compresses a large part of the output of the synchronous rectifier circuit SR and adds it to the indicator M. Through this LOG circuit, the scale of the indicator M becomes a logarithmic scale as shown by MΩ in FIG. 2, for example. Although the value of insulation resistance varies considerably, by setting the scale of the indicator M to a logarithmic scale as described above, insulation resistance can be measured over a wide range without a changeover switch. OUT is an analog signal output terminal and is connected to the output terminal of the synchronous rectifier circuit SR. AR is an amplification rectifier circuit,
SW 1 to SW 3 are interlocking changeover switches, each having an insulation resistance measuring terminal MΩ and a leakage current measuring terminal Io.
このような構成の測定装置において、先ず絶縁
抵抗を測定する場合について説明する。絶縁抵抗
を測定する場合にはスイツチSW1〜SW3の各可動
片を端子ＭΩに接続する。そして、変成器CT1，
CT2のコアの分割端１４，２４より活線状態にあ
る電源ラインl1とl2をコア内に共に挿入し、これ
をクリツプする。その後、発振器OSCの出力を
変成器CT1のコイル１３に供給して変成器CT1の
コア１１，１２を励磁する。電源ラインl1，l2は
変成器CT1の２次導体に相当するので、CT1のコ
ア１１，１２を励磁することによりl1，l2には周
波数の電圧ｅが印加され、この印加電圧による
電流は注入電流isとして図のＡ→Ｂ→Ｃ→Ｄ→Ｅ
を流れる。負荷LOに図示の如く大地との間に容
量Clおよび抵抗Rxが存在したとすると、前記の
径路で流れる注入電流isは
で表わされる。ここで、ｅは変成器CT1の２次側
導体である電源ラインl1，l2に生じる電圧で、こ
の電圧は一定値である。注入電流isは電磁作用に
よつて検出用変成器CT2で検出され、バンドパ
ス・アンプBPAに送出される。負荷LOと大地間
に電源ラインl1，l2による漏洩電流IOがある場
合、検出用変成器CT2はこの漏洩電流IOも検出す
るが、バンドパス・アンプBPAはこの電流IOを
カツトし、周波数の注入電流isのみを増幅す
る。バンドパス・アンプBPAを通つた周波数
の成分は同期整流回路SRに与えられて同期整流
される。同期整流回路SRにおける搬送波として
発振器OSCの出力が与えられているので、同
期整流回路SRの出力は負荷LOと大地との間の容
量性電流ｉcには関係なく、純抵抗分に流れるも
れ電流ｉrに対応する。もれ電流ｉrと純抵抗成分
である被測定の絶縁抵抗Rxとの間の関係は下式
で示される。 First, a case in which insulation resistance is measured using a measuring device having such a configuration will be described. When measuring insulation resistance, each movable piece of the switches SW 1 to SW 3 is connected to the terminal MΩ. and transformer CT 1 ,
The live power lines l1 and l2 are inserted into the core from the split ends 14 and 24 of the core of CT2 , and are clipped. Thereafter, the output of the oscillator OSC is supplied to the coil 13 of the transformer CT 1 to excite the cores 11 and 12 of the transformer CT 1 . Since the power lines l 1 and l 2 correspond to the secondary conductors of the transformer CT 1 , by exciting the cores 11 and 12 of CT 1 , a frequency voltage e is applied to l 1 and l 2 , and this application The current due to voltage is the injection current is as shown in the diagram A→B→C→D→E
flows. Assuming that there is a capacitance Cl and a resistance Rx between the load LO and the ground as shown in the figure, the injection current is flowing in the above path is It is expressed as Here, e is the voltage generated in the power supply lines l 1 and l 2 which are the secondary conductors of the transformer CT 1 , and this voltage is a constant value. The injected current is is sensed by electromagnetic action in the sensing transformer CT 2 and sent to the bandpass amplifier BPA. If there is a leakage current IO between the load LO and the ground due to the power lines l 1 and l 2 , the detection transformer CT 2 also detects this leakage current IO, but the bandpass amplifier BPA cuts this current IO, Amplify only the injection current is of the frequency. The frequency component that has passed through the bandpass amplifier BPA is applied to a synchronous rectifier circuit SR where it is synchronously rectified. Since the output of the oscillator OSC is given as the carrier wave in the synchronous rectifier circuit SR, the output of the synchronous rectifier circuit SR is independent of the capacitive current i c between the load LO and the ground, and is the leakage current flowing through the pure resistance. Corresponds to the current i r . The relationship between the leakage current i r and the insulation resistance Rx to be measured, which is a pure resistance component, is expressed by the following equation.
１／Ｒｘ＝ｉｒ／ｅ (2)
ｅは一定値であるので、(2)式から明らかなよう
に被測定絶縁抵抗Rxの値は同期整流回路SRの出
力の逆数として求められる。(2)式で求めた電流ｉ
rに対応した同期整流回路SRの出力は出力端子
OUTよりアナログ出力として取出されると共
に、近似対数変換回路LOGを介して指示計Ｍに
加えられる。LOG回路は同期整流回路SRの大き
な部分を圧縮し近似的に対数変換するので、指示
計Ｍの目盛は第２図のＭΩ目盛で示す如く対数目
盛となる。 1/Rx=i r /e (2) Since e is a constant value, as is clear from equation (2), the value of the insulation resistance to be measured Rx is determined as the reciprocal of the output of the synchronous rectifier circuit SR. Current i obtained from equation (2)
The output of the synchronous rectifier circuit SR corresponding to r is the output terminal
It is taken out as an analog output from OUT and is applied to the indicator M via the approximate logarithmic conversion circuit LOG. Since the LOG circuit compresses a large portion of the synchronous rectifier circuit SR and approximately converts it logarithmically, the scale of the indicator M becomes a logarithmic scale as shown by the MΩ scale in FIG.
出力端子OUTより得られるアナログ出力は被
測定抵抗Rxの逆数として記録計等に入力するこ
とにより長期間にわたつて連続的に絶縁抵抗を測
定することができる。なお、近似対数変換回路
LOGの出力を逆数変換し、その変換出力をアナ
ログ・デジタル変換器を用いてデイジタル信号に
変換するようにすれば、絶縁抵抗をデイジタル値
で表示することができる。なお、又、出力端子
OUTは必要に応じて設けられるものである。 By inputting the analog output obtained from the output terminal OUT to a recorder or the like as the reciprocal of the resistance to be measured Rx, insulation resistance can be measured continuously over a long period of time. In addition, approximate logarithmic conversion circuit
Insulation resistance can be displayed as a digital value by reciprocally converting the LOG output and converting the converted output into a digital signal using an analog-to-digital converter. In addition, the output terminal
OUT is provided as necessary.
次に、漏洩電流を測定する場合について説明す
る。この場合にはスイツチSW1〜SW3の可動片を
それぞれ端子Ioに接続する。これにより変成器
CT1は発振器OSCから切離され、又、変成器CT2
は増幅整流回路ARを介して指示計Ｍに接続され
る。 Next, the case of measuring leakage current will be explained. In this case, the movable pieces of the switches SW 1 to SW 3 are each connected to the terminal Io. This allows the transformer
CT 1 is disconnected from the oscillator OSC, and the transformer CT 2
is connected to the indicator M via the amplification and rectification circuit AR.
このような状態においては、ラインl1とl2に流
れる電流I1とI2の差電流Io（Io＝｜I1−I2｜）が変
成器CT2で検出される。この検出信号の値は漏洩
電流の値を示すものである。変成器CT2の検出出
力は増幅整流回路ARで増幅整流され、指示計Ｍ
で指示される。指示計Ｍの目盛は第２図の下段Io
で示される。 In such a state, the difference current Io (Io=| I1 - I2 |) between the currents I1 and I2 flowing in the lines l1 and l2 is detected by the transformer CT2 . The value of this detection signal indicates the value of leakage current. The detection output of transformer CT 2 is amplified and rectified by the amplification and rectification circuit AR,
will be instructed. The scale of indicator M is Io in the lower row of Fig. 2.
It is indicated by.
このように本発明の装置においては、機器の絶
縁抵抗と漏洩電流を活線状態のまま容易に測定す
ることができる。活線絶縁抵抗計による測定結果
は、測定値がそのまま法的根拠を持つていないの
で、漏洩電流も同時に測ることにより機器の安全
性を正確に把握することができる。 As described above, with the apparatus of the present invention, the insulation resistance and leakage current of equipment can be easily measured while the equipment is in a live state. The measurement results from a live-wire insulation resistance meter do not have legal basis as they are, so by measuring leakage current at the same time, it is possible to accurately assess the safety of the equipment.
第１図は本発明装置の使用状態を示すブロツク
図、第２図は本発明装置に用いられる指示計の一
例の目盛図である。
CT1……クリツプ式注入変成器、CT2……クリ
ツプ式検出用変成器、OSC……発振器、BPA…
…バンドパス・アンプ、SR……同期整流回路、
LOG……近似対数変換回路、Ｍ……指示計、
SW1，SW2……切換スイツチ、AR……増幅整流
器。
FIG. 1 is a block diagram showing how the device of the present invention is used, and FIG. 2 is a scale diagram of an example of an indicator used in the device of the present invention. CT 1 ... Clip type injection transformer, CT 2 ... Clip type detection transformer, OSC ... Oscillator, BPA...
...Bandpass amplifier, SR...Synchronous rectification circuit,
LOG...approximate logarithmic conversion circuit, M...indicator,
SW 1 , SW 2 ...Selector switch, AR...Amplification rectifier.
Claims (1)
周波数とは異なる周波数の電圧を発生する発振
器、この発振器の出力で励磁され前記電源のライ
ンをクリツプすることによりこの電源ラインに周
波数の電圧を印加する注入用変成器、前記印加
電圧によつて負荷と大地間を流れる電流を検出す
る検出用変成器、検出用変成器の出力のうち周波
数の成分のみを増幅するバンドパス・アンプと
このバンドパス・アンプの出力を周波数で同期
整流し負荷と大地間に存在する純抵抗を流れるも
れ電流を取り出す同期整流回路を介してこの同期
整流回路の出力の大きい部分を圧縮する近似対数
変換回路、第１の切換スイツチにより前記発振器
を注入用変成器から切離した状態において検出用
変成器の出力を整流する整流回路、及び前記近似
対数変換回路の出力端子とに第１の切換スイツチ
に連動する第２の切換スイツチを介して接続され
る指示計、を具備した絶縁試験装置。1. An oscillator that generates a voltage with a frequency different from the frequency of the power supply to which the load is connected via the line, which is excited by the output of this oscillator and applies a voltage with a frequency to this power supply line by clipping the line of the power supply. an injection transformer that detects the current flowing between the load and the ground according to the applied voltage, a detection transformer that detects the current flowing between the load and the ground according to the applied voltage, a bandpass amplifier that amplifies only the frequency component of the output of the detection transformer, and this bandpass amplifier. - Approximate logarithmic conversion circuit that compresses a large part of the output of this synchronous rectification circuit through a synchronous rectification circuit that synchronously rectifies the output of the amplifier at the frequency and extracts the leakage current flowing through the pure resistance that exists between the load and the ground. a rectifier circuit that rectifies the output of the detection transformer in a state where the oscillator is disconnected from the injection transformer by the first changeover switch; Insulation test equipment equipped with an indicator connected via a changeover switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13342179A JPS5657964A (en) | 1979-10-16 | 1979-10-16 | Insulation tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13342179A JPS5657964A (en) | 1979-10-16 | 1979-10-16 | Insulation tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5657964A JPS5657964A (en) | 1981-05-20 |
| JPS6148670B2 true JPS6148670B2 (en) | 1986-10-25 |
Family
ID=15104372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13342179A Granted JPS5657964A (en) | 1979-10-16 | 1979-10-16 | Insulation tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5657964A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56137166A (en) * | 1980-03-27 | 1981-10-26 | Toyo Commun Equip Co Ltd | Detecting method of leakage current |
| DE19606122C2 (en) * | 1996-02-20 | 1998-06-04 | Metrawatt Gmbh Gossen | Laboratory test device for determining the insulation quality of a consumer that can be connected to it for test purposes |
| KR100445755B1 (en) * | 2001-05-25 | 2004-08-25 | (주)에디테크 | Ground resist ance tester for power electric poles and a method of the measuring |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142143A (en) * | 1977-11-18 | 1979-02-27 | The United States Of America As Represented By The Secretary Of The Navy | Lightning ground system attachable admittance testing instrument |
| JPS54109883A (en) * | 1978-02-16 | 1979-08-28 | Fuji Electric Co Ltd | Floating capacity measuring apparatus |
-
1979
- 1979-10-16 JP JP13342179A patent/JPS5657964A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142143A (en) * | 1977-11-18 | 1979-02-27 | The United States Of America As Represented By The Secretary Of The Navy | Lightning ground system attachable admittance testing instrument |
| JPS54109883A (en) * | 1978-02-16 | 1979-08-28 | Fuji Electric Co Ltd | Floating capacity measuring apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5657964A (en) | 1981-05-20 |
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