JP2002243787A - Insulation monitoring device - Google Patents
Insulation monitoring deviceInfo
- Publication number
- JP2002243787A JP2002243787A JP2001041189A JP2001041189A JP2002243787A JP 2002243787 A JP2002243787 A JP 2002243787A JP 2001041189 A JP2001041189 A JP 2001041189A JP 2001041189 A JP2001041189 A JP 2001041189A JP 2002243787 A JP2002243787 A JP 2002243787A
- Authority
- JP
- Japan
- Prior art keywords
- insulation
- current
- monitoring device
- deterioration
- current transformer
- 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
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】本発明はビル等に設置された
電気設備、ケーブル等の負荷系統の絶縁抵抗劣化状態を
監視し、所定の絶縁抵抗以下になると注意を喚起し、大
事に至る前に負荷系統を適切に修理、遮断できるように
するための絶縁監視装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors the deterioration state of the insulation resistance of a load system such as electric equipment and cables installed in a building or the like, and alerts the user when the insulation resistance falls below a predetermined insulation resistance. The present invention relates to an insulation monitoring device for enabling a load system to be appropriately repaired and cut off.
【0002】[0002]
【従来の技術】ビルや工場に設置されている各種の電気
設備は、長年の使用によって絶縁抵抗劣化、絶縁耐圧劣
化が生じる。電気設備の絶縁抵抗劣化は、設置環境、特
に塵埃、温度、湿度等により劣化度合が異なる。この劣
化によって設備の誤作動、火事等の発生を招くことがあ
り、その防止のため重要な設備に対しては自社、メンテ
ナンス会社のサービスマンにより定期点検を行い、規定
値以下に絶縁抵抗が劣化していれば、対象電気設備や部
品の修理、交換等を行うようにしている。2. Description of the Related Art Various types of electrical equipment installed in buildings and factories are deteriorated in insulation resistance and dielectric breakdown voltage due to long-term use. The degree of insulation resistance deterioration of electrical equipment varies depending on the installation environment, particularly dust, temperature, humidity and the like. Due to this deterioration, malfunction of equipment and fire may occur.To prevent this, periodic inspections of important equipment are conducted by service personnel of our company and maintenance company, and insulation resistance deteriorates below the specified value. If so, repair and replacement of the target electrical equipment and parts are performed.
【0003】設備によっては、絶縁劣化が規定値以下と
なっていても、その時点で遮断が許されないものもあ
り、異常を検知して遮断器を作動させることはできず、
したがって、定期点検は非常に重要である。この絶縁劣
化の許容限度に対し、使用不可となる時期が予め分かれ
ば、設備、修理部品等を準備しておき、所定の時期に並
列運転しながら健全な状態に復帰させることができる。[0003] In some equipment, even if the insulation deterioration is less than the specified value, the interruption is not permitted at that time, and it is not possible to detect the abnormality and operate the circuit breaker.
Therefore, periodic inspection is very important. If it is known beforehand that the time of use becomes unusable with respect to the allowable limit of insulation deterioration, equipment, repair parts and the like can be prepared, and a normal state can be restored while operating in parallel at a predetermined time.
【0004】なお、電気設備の絶縁抵抗劣化を監視する
のに、配電線の漏れ電流を検出して行うことは、例え
ば、特開平9―218237号公報に記載されている。[0004] In order to monitor the deterioration of the insulation resistance of the electric equipment, the method of detecting the leakage current of the power distribution line is described in, for example, JP-A-9-218237.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、定期点
検では年1回程度の頻度であり、設備、機器の絶縁劣化
が何らかの原因で急速に進み、次の点検までに規定値を
越えてしまう場合には、十分な対応ができない問題があ
った。However, periodic inspections are performed approximately once a year. If the insulation of equipment and equipment rapidly deteriorates for some reason and exceeds the specified value by the next inspection, Had a problem that it was not possible to respond adequately.
【0006】本発明は、上記欠点に対処して成されたも
ので、その目的とするところは絶縁劣化を常に監視で
き、電気設備やケーブルの絶縁不良事故を未然に防止で
きる絶縁監視装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks. It is an object of the present invention to provide an insulation monitoring device capable of always monitoring insulation deterioration and preventing an insulation failure accident of electrical equipment and cables. Is to do.
【0007】[0007]
【課題を解決するための手段】本発明の特徴とするとこ
ろは、負荷に給電する配電線の洩れ電流を検出してその
トレンドを表示して絶縁抵抗の劣化状態を判断するよう
にしたことにある。A feature of the present invention is that a leakage current of a distribution line feeding a load is detected, a trend thereof is displayed, and a deterioration state of the insulation resistance is determined. is there.
【0008】[0008]
【発明の実施の形態】図1は本発明による絶縁監視装置
を示す構成図である。なお、図1の図示左側上の点線で
仕切った部分Gに、対象となる電気設備等が設置されて
いる。FIG. 1 is a block diagram showing an insulation monitoring device according to the present invention. In addition, the target electrical equipment etc. are installed in the part G separated by the dotted line on the left side of FIG.
【0009】図1において、1は配電線の高圧ライン、
例えば3相、3.3kVで、遮断器2、3を介して高圧
ライン4、5を形成し、変圧器6、7により夫々低圧ラ
イン8、9に変換する。低圧ライン8は3相、220
V、低圧ライン9は単相、110Vである。 3相低圧ライン8には負荷群10が夫々接続され、ま
た、単相低圧ライン9には負荷群11が夫々接続されて
いる。12は零相変流器などの電流変流器であり、各負
荷系統が絶縁劣化した際に生じる漏れ電流を検出するも
ので、所定の負荷に対して複数設置されている。これら
負荷群10、11の絶縁状態が健全の場合には、電流変
流器12の検出電流は漏洩電流が生じていないので、ゼ
ロである。In FIG. 1, 1 is a high voltage line of a distribution line,
For example, three-phase, 3.3 kV, high-voltage lines 4 and 5 are formed via circuit breakers 2 and 3, and converted into low-voltage lines 8 and 9 by transformers 6 and 7, respectively. Low pressure line 8 is three phase, 220
V, low voltage line 9 is single phase, 110V. A load group 10 is connected to each of the three-phase low-voltage lines 8, and a load group 11 is connected to each of the single-phase low-voltage lines 9. Reference numeral 12 denotes a current transformer such as a zero-phase current transformer, which detects a leakage current generated when insulation of each load system is deteriorated, and a plurality of current transformers are provided for a predetermined load. When the insulation state of these load groups 10 and 11 is sound, the detection current of the current transformer 12 is zero because no leakage current occurs.
【0010】13はリレーユニットで、複数の電流変成
器12の検出電流が入力され、順次制御装置14に送ら
れる。15は絶縁監視装置で、点線左側の監視室Rに設
置され、制御装置14の処理信号に基づき、各負荷群1
0、11の絶縁状態を監視する。[0013] Reference numeral 13 denotes a relay unit to which the detected currents of the plurality of current transformers 12 are input and sequentially sent to the control device 14. Reference numeral 15 denotes an insulation monitoring device, which is installed in the monitoring room R on the left side of the dotted line, and controls each load group
The insulation status of 0 and 11 is monitored.
【0011】図2は電流変流器12による漏れ電流検出
原理を示す図である。FIG. 2 is a diagram showing a principle of detecting a leakage current by the current transformer 12.
【0012】電流変流器12は、負荷群10、11への
配電線16を包むよう、ループ状に設置されており、負
荷群10、11の電源系統に絶縁不良のない図2の
(A)で示す健全時には、漏れ電流が生じないので電流
変流器12の検出値はゼロである。The current transformer 12 is installed in a loop so as to surround the distribution line 16 to the load groups 10 and 11, and the power supply system of the load groups 10 and 11 has no insulation failure (A in FIG. 2). In the normal state shown in ()), the leakage current does not occur, and the detection value of the current transformer 12 is zero.
【0013】負荷群10、11の一部に絶縁劣化が発生
すると、図2の(B)で示すように大地に対して漏れ電
流Δiが流れる。この漏れにより前記した状態が崩れて
アンバランスとなり、電流変流器12にはこれに応じた
電流が検出される。負荷群10、11の他、これらの電
源系統を構成するケーブルに絶縁不良が発生しても、同
様の電流検出が行われる。When insulation deterioration occurs in a part of the load groups 10 and 11, a leakage current Δi flows to the ground as shown in FIG. Due to this leakage, the above-mentioned state collapses and becomes unbalanced, and a current corresponding to this is detected in the current transformer 12. Similar current detection is performed even if insulation failure occurs in the cables constituting these power supply systems in addition to the load groups 10 and 11.
【0014】電源が3相の場合には、絶縁劣化がないと
き、3本のラインが負荷電流でバランスしているため、
いわゆるゼロ相電流は流れない。絶縁劣化が生じ、この
バランスが崩れると前記同様に電流変流器12に検出電
流が流れる。When the power supply has three phases, the three lines are balanced by the load current when there is no insulation deterioration.
No so-called zero-phase current flows. If insulation is deteriorated and this balance is lost, a detection current flows through the current transformer 12 as described above.
【0015】この検出電流はリレーユニット13を経由
して制御装置14に送られ、所定の信号処理が行われ
る。その処理信号は、絶縁劣化状態を絶縁監視装置15
で画面表示、印画、印字、警報発生等が行えるようにす
るものである。The detected current is sent to the control device 14 via the relay unit 13, and a predetermined signal processing is performed. The processed signal indicates the insulation deterioration state by the insulation monitoring device 15.
To enable screen display, printing, printing, alarm generation, and the like.
【0016】絶縁監視装置15は、処理信号に基づくデ
ータの画面表示、データにより処理したグラフ表示、外
部に設置した印刷機駆動が容易に行えるよう、例えばパ
ソコン(パーソナルコンピュータ)を用いるのが好都合
である。For the insulation monitoring device 15, it is convenient to use, for example, a personal computer (personal computer) so that the screen display of data based on the processing signal, the graph display processed by the data, and the driving of a printing machine installed outside can be easily performed. is there.
【0017】図3は画面表示の一例で、横軸の期日と時
刻における絶縁抵抗を、前記検出電流値に換算して縦軸
に表わした履歴グラフ。図4はその数値履歴データであ
る。FIG. 3 is an example of a screen display, and is a history graph in which the insulation resistance at the date and time on the horizontal axis is converted into the detected current value and is expressed on the vertical axis. FIG. 4 shows the numerical value history data.
【0018】ある負荷系統の絶縁抵抗の変化状態を15
分毎の頻度で測定した例であり、図3では測定点をプロ
ットしてグラフ表示したものである。図4はその数値デ
ータであり、電流の設定レベル1、2に対し、検出電流
値がそれらのレベル以下のときは白丸、以上のときは黒
丸で表示している。The change state of the insulation resistance of a certain load system is
This is an example of measurement at a frequency of every minute, and FIG. 3 is a graph in which measurement points are plotted and displayed. FIG. 4 shows the numerical data, and the current setting levels 1 and 2 are indicated by white circles when the detected current value is equal to or lower than those levels, and are indicated by black circles when the detected current value is higher than these levels.
【0019】例えば、電気設備またはその系統に対し、
修理を要する絶縁抵抗の劣化許容限度が、検出電流値換
算で500mAとすると、その値の20%、40%のレ
ベル1、2を設定し、劣化許容限度に近づいている旨を
知らせて注意を喚起するとともに、以降の予測ができる
ことになる。いわゆるトレンド管理が可能となり、大事
に至る前にその部位の再点検を行ったり、修理や交換部
品を準備したりすることができる。For example, for electrical equipment or its system,
Assuming that the allowable deterioration limit of the insulation resistance that requires repair is 500 mA in terms of the detected current value, set the levels 1 and 2 at 20% and 40% of that value, and inform them that they are approaching the allowable deterioration limit. Arousing and predicting the future. So-called trend management becomes possible, so that the part can be rechecked, repaired or replaced parts can be prepared before it becomes important.
【0020】また、使用時に電源を遮断すると不都合な
電気設備、例えばエレベータにおいては、絶縁劣化があ
る程度進んでいても、安全上その時点で遮断することは
できない。したがって、この場合には、エレベータの休
止時間帯に点検、修理が行われることになる。その他、
製鉄所における設備等では、劣化状態が許容限度に至る
前に交換用の設備を準備しておき、並列運転しながら健
全な状態に切替えることができる。In addition, in the case of electrical equipment in which it is inconvenient to shut off the power supply during use, for example, an elevator, even if the insulation deterioration has progressed to some extent, it cannot be shut off at that time for safety. Therefore, in this case, inspection and repair will be performed during the downtime of the elevator. Others
In equipment at a steel mill, replacement equipment is prepared before the deterioration state reaches an allowable limit, and the state can be switched to a healthy state while operating in parallel.
【0021】測定頻度は、電気設備に応じて数分〜数十
分等、任意の値に設定する。一律に頻度を同一に設定す
るとリレーユニット13、制御装置14、監視装置15
の容量増大を招くため、電気設備の重要度や、経験的に
判明している絶縁抵抗劣化の進行度合に応じ、適切な頻
度に設定するのが得策である。The measurement frequency is set to an arbitrary value such as several minutes to several tens of minutes depending on the electric equipment. If the frequency is set to be the same, the relay unit 13, the control device 14, and the monitoring device 15
Therefore, it is advisable to set the frequency to an appropriate frequency according to the importance of the electrical equipment and the degree of progress of the insulation resistance deterioration that is empirically known.
【0022】[0022]
【発明の効果】本発明によれば、絶縁劣化を常に監視
し、電気設備や電源ケーブルの絶縁に関する再点検、修
理、部品交換等の処置が適切に行え、絶縁不良事故を未
然に防止できる効果を奏する。According to the present invention, insulation deterioration is always monitored, and reinspections, repairs, parts replacement, etc. concerning insulation of electrical equipment and power cables can be appropriately performed, and insulation failure accidents can be prevented beforehand. To play.
【図1】本発明による絶縁監視装置の一実施例を示す構
成図。FIG. 1 is a configuration diagram showing an embodiment of an insulation monitoring device according to the present invention.
【図2】電流変流器による漏れ電流検出原理を示す図。FIG. 2 is a diagram showing a principle of detecting a leakage current by a current transformer.
【図3】本発明による画面表示の一例図。FIG. 3 is an example of a screen display according to the present invention.
【図4】図3の数値履歴データ。FIG. 4 is numerical history data of FIG.
1、4、5…高圧ライン、 6…3相−3相変圧器、 7…3相−単相変圧器、 8…3相低圧ライン 9…単相低圧ライン、 10…3相負荷群 11…単相負荷群、 12…電流変流器、 13…リレーユニット 14…制御装置、 15…絶縁監視装置、 16…配電線、 17…配電線 1, 4, 5 ... high voltage line, 6 ... 3 phase-3 phase transformer, 7 ... 3 phase-single phase transformer, 8 ... 3 phase low voltage line 9 ... single phase low voltage line, 10 ... 3 phase load group 11 ... Single-phase load group, 12: Current transformer, 13: Relay unit 14: Control device, 15: Insulation monitoring device, 16: Distribution line, 17: Distribution line
Claims (2)
る電流変流器と、前記電流変流器の検出値を入力してそ
のトレンドを表示して絶縁抵抗の劣化状態を判断する絶
縁監視手段とを具備することを特徴とする絶縁監視装
置。1. A current transformer for detecting a leakage current of a distribution line for feeding a load, and an insulation for inputting a detection value of the current transformer and displaying a trend thereof to judge a deterioration state of an insulation resistance. An insulation monitoring device, comprising: monitoring means.
それぞれ検出する複数の電流変流器と、これら電流変流
器の検出値を順次取り込むリレーユニットと、前記リレ
ーユニットから与えられる前記電流変流器の検出値を入
力してそのトレンドを表示して絶縁抵抗の劣化状態を判
断するパーソナルコンピュータとを具備することを特徴
とする絶縁監視装置。2. A plurality of current transformers for respectively detecting zero-sequence currents of a plurality of distribution lines supplying power to a load, a relay unit for sequentially taking in the detected values of these current transformers, and a relay unit. A personal computer for inputting a detected value of the current transformer, displaying a trend thereof, and judging a deterioration state of the insulation resistance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001041189A JP2002243787A (en) | 2001-02-19 | 2001-02-19 | Insulation monitoring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001041189A JP2002243787A (en) | 2001-02-19 | 2001-02-19 | Insulation monitoring device |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2002243787A true JP2002243787A (en) | 2002-08-28 |
Family
ID=18903669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001041189A Pending JP2002243787A (en) | 2001-02-19 | 2001-02-19 | Insulation monitoring device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2002243787A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103592586A (en) * | 2013-11-27 | 2014-02-19 | 国家电网公司 | Power cable insulation monitoring system |
CN103954887A (en) * | 2014-03-31 | 2014-07-30 | 国家电网公司 | Power line insulation monitoring method based on instant fault |
JP2017146112A (en) * | 2016-02-15 | 2017-08-24 | 三菱電機株式会社 | Electric facility diagnostic method |
CN109596948A (en) * | 2018-12-10 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | A kind of distribution line state of insulation evaluation method |
WO2022068074A1 (en) * | 2020-09-29 | 2022-04-07 | 山东大学 | Early warning method and system for slowly developing permanent fault |
-
2001
- 2001-02-19 JP JP2001041189A patent/JP2002243787A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103592586A (en) * | 2013-11-27 | 2014-02-19 | 国家电网公司 | Power cable insulation monitoring system |
CN103954887A (en) * | 2014-03-31 | 2014-07-30 | 国家电网公司 | Power line insulation monitoring method based on instant fault |
JP2017146112A (en) * | 2016-02-15 | 2017-08-24 | 三菱電機株式会社 | Electric facility diagnostic method |
CN109596948A (en) * | 2018-12-10 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | A kind of distribution line state of insulation evaluation method |
CN109596948B (en) * | 2018-12-10 | 2020-12-15 | 国网山东省电力公司电力科学研究院 | Distribution line insulation state evaluation method |
WO2022068074A1 (en) * | 2020-09-29 | 2022-04-07 | 山东大学 | Early warning method and system for slowly developing permanent fault |
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