JPH0298673A - Insulation resistance detector - Google Patents
Insulation resistance detectorInfo
- Publication number
- JPH0298673A JPH0298673A JP63249842A JP24984288A JPH0298673A JP H0298673 A JPH0298673 A JP H0298673A JP 63249842 A JP63249842 A JP 63249842A JP 24984288 A JP24984288 A JP 24984288A JP H0298673 A JPH0298673 A JP H0298673A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- motor
- insulation resistance
- voltage
- winding
- 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.)
- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000006866 deterioration Effects 0.000 claims abstract description 9
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Manufacture Of Motors, Generators (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的］
（産業上の利用分野）
本発明は電動機巻線の絶縁劣化を監視し、電気事故を防
止する絶縁抵抗検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an insulation resistance detection device for monitoring insulation deterioration of motor windings and preventing electrical accidents.
（従来の技術）
電動機巻線の絶縁抵抗を検出して電気事故を防止するた
めに絶縁抵抗検出装置が用いられている。(Prior Art) Insulation resistance detection devices are used to detect the insulation resistance of motor windings and prevent electrical accidents.
以下、従来の絶縁抵抗検出装置の回路構成図を第３図に
ついて説明する。Hereinafter, a circuit diagram of a conventional insulation resistance detection device will be explained with reference to FIG.
第３図において、１は電動機、２は電動機１の配電線１
４に設けた接触器、２ｂは接触器２の補助接点である。In Fig. 3, 1 is a motor, and 2 is a distribution line 1 of the motor 1.
The contactor 2b is an auxiliary contact of the contactor 2.
また配電線１４には接触器２の補助接点２ｂ、スイッチ
３を介して継電器（ＲＹ＋ ）５が接続されている。Further, a relay (RY+) 5 is connected to the power distribution line 14 via an auxiliary contact 2b of the contactor 2 and a switch 3.
４はＤＣ１５Ｖ程度の直流電源で、絶縁抵抗検出回路６
に接続されている。この絶縁抵抗検出回路６では、抵抗
器Ｒｔ 、 Ｒ２。4 is a DC power supply of about 15V DC, and insulation resistance detection circuit 6
It is connected to the. In this insulation resistance detection circuit 6, resistors Rt and R2.
Ｒ３と電動機１の絶縁抵抗ｒによりブリッジ回路を構成
しており、このブリッジ回路の出力信号はＯＰアンプ（
比較器）８を介して検出信号出力回路７に入力され、検
出信号出力回路７のトランジスタ９を導通あるいは非導
通することにより継電器（ＲＹ２）１０を作動させ、そ
の接点１０ａの開閉動作を行うように構成されている。A bridge circuit is formed by R3 and the insulation resistance r of the motor 1, and the output signal of this bridge circuit is sent to an OP amplifier (
The signal is input to the detection signal output circuit 7 via the comparator) 8, and by making the transistor 9 of the detection signal output circuit 7 conductive or non-conductive, the relay (RY2) 10 is operated, and its contact 10a is opened and closed. It is composed of
図において、スイッチ３を投入すると、Ｉｌ！電器５の
接点５ａが閉となり、電源４の直流電圧ｖＣＣが絶縁抵
抗検出回路６に印加される。In the figure, when switch 3 is turned on, Il! The contact 5a of the electric appliance 5 is closed, and the DC voltage vCC of the power supply 4 is applied to the insulation resistance detection circuit 6.
このとき、電動機１が正常状態（絶縁劣化状態でない）
であると、″Ｉｌ！！縁抵抗検用抵抗検出回路６ンプ８
の出力信号は、検出信号出力回路７のトランジスタ９の
ベースに与えられるので、トランジスタ９は導通状態と
なり、継電器（ＲＹ２）１０も導通し、その接点１０ａ
を閉じ、図示しない表示装置で正常状態を表示する。し
かし、電動Ｒ１が異常状態（絶縁劣化状態）にあると、
絶縁抵抗検出回路６のＯＰアンプ８は出力信号を生じな
いので、検出信号出力回路７のトランジスタ９は不導通
状態となり、継電器１０は不導通となるからその接点１
０ａは開となり、図示しない表示装置で異常状態を表示
する。また、電動機運転中は接触器２の補助接点２ｂが
開となっており、これによりｍ電器５は開となっている
ので、電動機主回路と絶縁抵抗検出回路６は分離されて
いる。At this time, the motor 1 is in a normal state (not in a deteriorated insulation state).
Then, ``Il!!Resistance detection circuit for edge resistance detection 6amp 8
Since the output signal is given to the base of the transistor 9 of the detection signal output circuit 7, the transistor 9 becomes conductive, and the relay (RY2) 10 also becomes conductive, and its contact 10a
is closed, and the normal status is displayed on a display device (not shown). However, if electric R1 is in an abnormal state (insulation deterioration state),
Since the OP amplifier 8 of the insulation resistance detection circuit 6 does not generate an output signal, the transistor 9 of the detection signal output circuit 7 becomes non-conductive, and the relay 10 becomes non-conductive, so its contact 1
0a is open, and an abnormal state is displayed on a display device (not shown). Further, while the motor is in operation, the auxiliary contact 2b of the contactor 2 is open, and the m-electric device 5 is therefore open, so that the motor main circuit and the insulation resistance detection circuit 6 are separated.
（発明が解決しようとする課題）
ところで、上記従来の絶縁抵抗検出装置では絶縁抵抗を
検出するときの電動機への印加電圧がＤＣ１５Ｖ程度と
低いので、絶縁抵抗を精度よく検出できないという問題
があった。Ｖなわち、電動機の絶縁抵抗は電動機巻線の
絶縁体のイオン化電流により決るので、その値は検出す
るときの印加電圧により変化し、特に印加電圧の低い点
では変動が大きいということが実験から分っている。こ
のことは第２図の電動機巻線の絶縁抵抗と印加電圧の関
係を示した特性図によっても同様なことが言える。すな
わち、印加電圧の低い点では絶縁抵抗値の変化が大きく
一定値とならないので、上述したように、電動機巻線の
絶縁抵抗を精度よく検出できないという問題があった。(Problem to be Solved by the Invention) By the way, with the conventional insulation resistance detection device described above, the voltage applied to the motor when detecting insulation resistance is as low as about 15 V DC, so there was a problem that insulation resistance could not be detected accurately. . In other words, the insulation resistance of a motor is determined by the ionization current of the insulator of the motor windings, so its value changes depending on the applied voltage at the time of detection, and experiments have shown that the fluctuation is particularly large at low applied voltages. I understand. The same can be said of the characteristic diagram shown in FIG. 2 which shows the relationship between the insulation resistance of the motor windings and the applied voltage. That is, at points where the applied voltage is low, the insulation resistance value changes greatly and does not remain constant, so as described above, there is a problem that the insulation resistance of the motor windings cannot be accurately detected.
本発明は上記事情に鑑みてなされたもので、その目的は
、電動機巻線の絶縁抵抗を正確に検出してその絶縁劣化
が規定値以上のとき異常信号を出力する絶縁抵抗検出装
置を提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to provide an insulation resistance detection device that accurately detects the insulation resistance of a motor winding and outputs an abnormal signal when the insulation deterioration exceeds a specified value. There is a particular thing.
［発明の構成］
（課題を解決するための手段）
上記目的を達成するために、本発明は電動機巻線の絶縁
劣化を検出してその検出値が規定値以上のとき異常信号
を出力する絶縁抵抗検出装置において、前記電動機巻線
と大地間に直流高電圧を印加する高電圧発生手段と、前
記直流高電圧により発生した漏れ電流の大きざから算出
された絶縁抵抗値を規定値と比較する絶縁抵抗検出手段
と、前記電動機巻線に電圧を印加してから所定時間経過
後の絶縁抵抗状態を検出信号として出力するタイマ回路
と、前記検出信号を出力する出力手段とから構成された
ことを特徴とするものである。[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides an insulation system that detects insulation deterioration of a motor winding and outputs an abnormal signal when the detected value is equal to or higher than a specified value. In the resistance detection device, an insulation resistance value calculated from a high voltage generating means that applies a DC high voltage between the motor winding and the ground and a magnitude of leakage current generated by the DC high voltage is compared with a specified value. The motor is comprised of an insulation resistance detection means, a timer circuit that outputs the insulation resistance state as a detection signal after a predetermined period of time has elapsed since voltage is applied to the motor windings, and an output means that outputs the detection signal. This is a characteristic feature.
（作 用）
本発明の絶縁抵抗検出装置によれば、電動機巻線に電圧
印加したとき電動機巻線の浮遊容伍のために生じる突入
電流の影響を除いているので、電動機巻線の絶縁劣化状
態の異常を正確に判定できる。また、電動機巻線に印加
する直流電圧が高くしかも、絶縁抵抗検出回路はブリッ
ジ回路を構成しているので、電動機巻線に印加する電圧
が変動しても影響されることがなく、精度良く検出でき
る。(Function) According to the insulation resistance detection device of the present invention, since the influence of rush current generated due to stray capacitance of the motor windings when voltage is applied to the motor windings is removed, insulation deterioration of the motor windings is prevented. Abnormal conditions can be accurately determined. In addition, since the DC voltage applied to the motor windings is high, and the insulation resistance detection circuit forms a bridge circuit, it is not affected even if the voltage applied to the motor windings fluctuates, resulting in highly accurate detection. can.
（実施例） 本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の回路構成図である。FIG. 1 is a circuit diagram of an embodiment of the present invention.
第１図において、１は電動機、２は電動機１の配電線１
４に８９けた接触器、２ｂは接触器２の補助接点、４は
ＤＣ１５Ｖ程度の直流電源である。また配電線１４から
補助接点２ｂ、スイッチ３を介してＮ電器（ＲＹｔ）５
が接続されてあり、その接点５ａは電動機１と分岐抵抗
Ｒ１との間に設けられている。配電線１４に接続された
高電圧発生回路１１の直流高電圧は絶縁抵抗検出回路６
のブリッジ回路に接続されている。このブリッジ回路は
、分岐抵抗Ｒ１〜Ｒ４と電動機１の巻線と大地間との抵
抗（絶縁抵抗）ｒにより構成されてあり、その出力信号
は比較器８を介してアンド回路１２の入力端に入力され
る。アンド回路１２の他方の入力端にはタイマ回路１３
が接続されている。アンド回路１２の出力信号は検出信
号出力回路７に入力され、検出信号出力回路７のトラン
ジスタ９を導通あるいは非導通とすることにより継電器
（ＲＹ２）１０を作動させ、その接点１０ａの開閉動作
を行うように構成されている。In Fig. 1, 1 is a motor, and 2 is a distribution line 1 of the motor 1.
4 is an 89-digit contactor, 2b is an auxiliary contact of the contactor 2, and 4 is a DC power source of approximately 15V DC. In addition, from the distribution line 14 to the auxiliary contact 2b, via the switch 3, the N electric appliance (RYt) 5
is connected, and its contact 5a is provided between the motor 1 and the branch resistor R1. The DC high voltage of the high voltage generation circuit 11 connected to the distribution line 14 is detected by the insulation resistance detection circuit 6.
connected to the bridge circuit. This bridge circuit is composed of branch resistors R1 to R4 and a resistance (insulation resistance) r between the windings of the motor 1 and the ground, and its output signal is sent to the input terminal of an AND circuit 12 via a comparator 8. is input. A timer circuit 13 is connected to the other input terminal of the AND circuit 12.
is connected. The output signal of the AND circuit 12 is input to the detection signal output circuit 7, and by making the transistor 9 of the detection signal output circuit 7 conductive or non-conductive, the relay (RY2) 10 is operated, and its contact 10a is opened and closed. It is configured as follows.
次に、スイッチ３を投入すると、スイッチ３と連動する
スイッチ３ａが閉となり、タイマ回路１３を動作せしめ
る。タイマ回路１３は電動ａ巻線にＤＣ５００Ｖを印加
したとき電動機巻線と大地間の浮遊各組のために漏れ電
流が多く流れるが、その時期での検出を防ぐために設け
るものである。Next, when the switch 3 is turned on, the switch 3a interlocked with the switch 3 is closed, and the timer circuit 13 is operated. The timer circuit 13 is provided to prevent detection at a time when a large amount of leakage current flows due to floating pairs between the motor winding and the ground when DC 500 V is applied to the motor A winding.
また、スイッチ３を投入すると、継電器５の接点５ａが
閉になるとともに配電線１４から高電圧発生回路１１に
電力が与えられ、Ｄ０５００Ｖの直流高電圧が絶縁抵抗
検出回路６のブリッジ回路に印加される。このとき、電
動機１が正常状態（絶縁劣化状態でない）でおると、絶
縁抵抗検出回路６の比較器８の出力信号１１１１＋（ハ
イレベル）がアンド回路１２に与えられる。一方、タイ
マ回路１３がタイムアツプすると、タイマ回路１３の出
力信号＋＋ １ ｔｔがアンド回路１２に与えられるの
でアンド回路１２のアンド条件が成立し、その出力信号
は、検出信号出力回路７のトランジスタ９のベースに与
えられる。これによりトランジスタ９は導通状態となり
、継電器（ＲＹ２ ）１０も導通し、その接点１０ａを
閉じ、図示しない表示装置で正常状態を表示する。しか
し、もし電動数１が異常状態（絶縁劣化状態）におると
、比較器８の出力信号は“′１″にならず１１０１１
（ロウレベル）のままなので、タイマ回路１３がタイ
ムアツプしてタイマ回路１３の出力信号゛″１″がアン
ド回路１２に与えられてもアンド条件は成立しないので
、検出信号出力回路７のトランジスタ９は不導通状態と
なり、継電器１０は不導通となるからその接点１０ａは
開となり、図示しない表示装置で異常状態を表示する。When the switch 3 is turned on, the contact 5a of the relay 5 is closed and power is supplied from the distribution line 14 to the high voltage generation circuit 11, and a DC high voltage of D0500V is applied to the bridge circuit of the insulation resistance detection circuit 6. Ru. At this time, if the motor 1 is in a normal state (not in a deteriorated insulation state), the output signal 1111+ (high level) of the comparator 8 of the insulation resistance detection circuit 6 is given to the AND circuit 12. On the other hand, when the timer circuit 13 times up, the output signal ++1tt of the timer circuit 13 is given to the AND circuit 12, so the AND condition of the AND circuit 12 is satisfied, and the output signal is applied to the transistor 9 of the detection signal output circuit 7. given to the base. As a result, the transistor 9 becomes conductive, the relay (RY2) 10 also becomes conductive, its contact 10a is closed, and a normal state is displayed on a display device (not shown). However, if the motor number 1 is in an abnormal state (insulation deterioration state), the output signal of the comparator 8 will not be "'1" but will be 11011.
(remains at low level), even if the timer circuit 13 times up and the output signal "1" of the timer circuit 13 is given to the AND circuit 12, the AND condition is not satisfied, so the transistor 9 of the detection signal output circuit 7 is disabled. The relay 10 becomes conductive and the relay 10 becomes non-conductive, so that its contacts 10a are opened and an abnormal state is displayed on a display device (not shown).
一方、電動機運転中は接触器２の補助接点２ｂが開とな
ってあり、これにより継電器５は開となっているので、
電動機主回路と絶縁抵抗検出回路６は分離されている。On the other hand, while the motor is operating, the auxiliary contact 2b of the contactor 2 is open, which causes the relay 5 to be open.
The motor main circuit and the insulation resistance detection circuit 6 are separated.
［発明の効果コ
以上説明したように、本発明によれば電動機巻線に印加
する直流電圧が高くかつタイマ回路により電動機巻線の
電圧印加時の突入電流の影響を除いているので、電動機
巻線の絶縁劣化状態が異常であることを正確に判定でき
る。また、絶縁抵抗検出回路はブリッジ回路を構成して
いるので、電動機巻線に印加する電圧変動に対して影響
されることがないというすぐれた効果を秦する。[Effects of the Invention] As explained above, according to the present invention, the DC voltage applied to the motor windings is high and the timer circuit eliminates the influence of rush current when voltage is applied to the motor windings, so the motor windings are It is possible to accurately determine that the insulation deterioration state of the wire is abnormal. Furthermore, since the insulation resistance detection circuit constitutes a bridge circuit, it has an excellent effect of being unaffected by voltage fluctuations applied to the motor windings.
【図面の簡単な説明】
第１図は本発明の一実施例の回路構成図、第２図は電動
Ｒ巻線の絶縁抵抗と印加電圧の特性を示す図、第３図は
従来の絶縁抵抗検出装置の回路構成図である。
９・・・トランジスタ
１１・・・高電圧発生回路
１２・・・アンド回路
１３・・・タイマ回路
１４・・・配電線
１・・・電動機
２・・・接触器
３．３ａ・・・スイッチ
４・・・直流電源
５．１０・・・継電器
６・・・絶縁抵抗検出回路
７・・・検出信号出力回路
８・・・比較器
代理人 弁理士 則 近 憲 佑
同 第子丸 健
第
図
第
図[Brief Description of the Drawings] Figure 1 is a circuit configuration diagram of an embodiment of the present invention, Figure 2 is a diagram showing the insulation resistance and applied voltage characteristics of the electric R winding, and Figure 3 is a diagram showing the conventional insulation resistance. FIG. 3 is a circuit configuration diagram of a detection device. 9... Transistor 11... High voltage generation circuit 12... AND circuit 13... Timer circuit 14... Distribution line 1... Motor 2... Contactor 3.3a... Switch 4 ... DC power supply 5.10 ... Relay 6 ... Insulation resistance detection circuit 7 ... Detection signal output circuit 8 ... Comparator agent Patent attorney Yudo Nori Chika Ken Daishimaru Figure 1 figure
Claims (1)
定値以上のとき異常信号を出力する絶縁抵抗検出装置に
おいて、前記電動機巻線と大地間に直流高電圧を印加す
る高電圧発生手段と、前記直流高電圧により発生した漏
れ電流の大きさから算出された絶縁抵抗値を規定値と比
較する絶縁抵抗検出手段と、前記電動機巻線に電圧を印
加してから所定時間経過後の絶縁抵抗状態を検出信号と
して出力するタイマ回路と、前記検出信号を出力する出
力手段とから構成されたことを特徴とする絶縁抵抗検出
装置。(1) In an insulation resistance detection device that detects insulation deterioration of a motor winding and outputs an abnormal signal when the detected value is greater than a specified value, a high voltage generator that applies a DC high voltage between the motor winding and the ground. means, insulation resistance detection means for comparing an insulation resistance value calculated from the magnitude of the leakage current generated by the DC high voltage with a specified value, and after a predetermined period of time has elapsed since the voltage was applied to the motor windings. An insulation resistance detection device comprising: a timer circuit that outputs an insulation resistance state as a detection signal; and an output means that outputs the detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249842A JPH0298673A (en) | 1988-10-05 | 1988-10-05 | Insulation resistance detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249842A JPH0298673A (en) | 1988-10-05 | 1988-10-05 | Insulation resistance detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0298673A true JPH0298673A (en) | 1990-04-11 |
Family
ID=17198994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63249842A Pending JPH0298673A (en) | 1988-10-05 | 1988-10-05 | Insulation resistance detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0298673A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007159289A (en) * | 2005-12-06 | 2007-06-21 | Fanuc Ltd | Motor drive unit |
| CN103323674A (en) * | 2013-05-21 | 2013-09-25 | 江苏宝丰新能源科技有限公司 | Circuit and method for real-time detection of ground insulation impedance of photovoltaic grid-connected inverter |
| CN105676083A (en) * | 2016-01-25 | 2016-06-15 | 上海旷奇科技有限公司 | Online insulation resistance monitoring device and method for power motor |
-
1988
- 1988-10-05 JP JP63249842A patent/JPH0298673A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007159289A (en) * | 2005-12-06 | 2007-06-21 | Fanuc Ltd | Motor drive unit |
| CN103323674A (en) * | 2013-05-21 | 2013-09-25 | 江苏宝丰新能源科技有限公司 | Circuit and method for real-time detection of ground insulation impedance of photovoltaic grid-connected inverter |
| CN105676083A (en) * | 2016-01-25 | 2016-06-15 | 上海旷奇科技有限公司 | Online insulation resistance monitoring device and method for power motor |
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