JPS5855768A - Insulation diagnosing method - Google Patents
Insulation diagnosing methodInfo
- Publication number
- JPS5855768A JPS5855768A JP56154447A JP15444781A JPS5855768A JP S5855768 A JPS5855768 A JP S5855768A JP 56154447 A JP56154447 A JP 56154447A JP 15444781 A JP15444781 A JP 15444781A JP S5855768 A JPS5855768 A JP S5855768A
- Authority
- JP
- Japan
- Prior art keywords
- insulation
- resistance value
- insulator
- state
- value
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Manufacturing Of Electric Cables (AREA)
- Electric Cable Installation (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は絶縁診断方法に関し、特に回転機器の固定子
巻線や回転子巻線の絶縁の劣化状態および絶縁破壊値の
推定をする絶縁診断方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation diagnosis method, and more particularly to an insulation diagnosis method for estimating the deterioration state and dielectric breakdown value of the insulation of a stator winding or a rotor winding of a rotating device.
従来この種の絶縁診断方法としては、 ｌ）絶縁抵抗試験 ２）直流吸収試験 ３）交流電流試験 り Ｔａｎδ試験 ｊ）部分放電試験 等があり、普通定常雰囲気中にて実施している。Conventionally, this type of insulation diagnosis method is as follows: l) Insulation resistance test 2) DC absorption test 3) AC current test Tanδ test j) Partial discharge test etc., and is usually carried out in a steady atmosphere.
一般に回転機の巻線絶縁物を１スロット部とコイルエン
ド部の絶縁に大きく分けることができ、その等価回路を
８７図に示す。図において、Ｔａｎδ。In general, the winding insulation of a rotating machine can be broadly divided into insulation for one slot portion and coil end portion, and the equivalent circuit thereof is shown in Fig. 87. In the figure, Tanδ.
はスロット部のＴａｎδであり、Ｔａｎδ２ はコイル
エンド部のＴａｎδであるｎＴａｎδ、はコイル鉄心部
の静電容量分Ｃ０とコイル鉄心部の絶縁抵抗Ｒ８との並
列接続体からなり、電源ｐｗに並列接続されて示されて
いる。またＴａｎδ２はコイルエンド部の静電容−分Ｃ
１とコイルエンド部の絶縁抵抗分Ｒ１との並列接続体か
らなり、コイルエンド表面の表面抵Ｎ：Ｒｓを介して電
源ｐｗに並列接続されて示されていム。is the Tan δ of the slot portion, Tan δ2 is the Tan δ of the coil end portion, nTan δ is composed of a parallel connection of the capacitance C0 of the coil core and the insulation resistance R8 of the coil core, and is connected in parallel to the power supply pw. is shown. In addition, Tan δ2 is the capacitance of the coil end - minute C
1 and the insulation resistance R1 of the coil end portion, and is shown connected in parallel to the power supply pw via the surface resistance N:Rs on the surface of the coil end.
絶縁物の劣化要因としては、熱的劣化、電気的劣化、機
械的劣化、環境化学的劣化が考えられるが、特に交流電
動機の場合は、起動時の起動ｔｔｌＬによる電磁力によ
り、コイルエンドに大きな機械的ストレスが発生し、こ
の機械的劣化を主要因として、熱劣化、環境化学劣化が
相まってコイルエンド部に欠陥が発生するという傾向を
有する。事実、長期間実使用した機器の絶縁破壊試験を
実施すると、コイルエンドからアースに出面閃絡を生じ
る場合が多い。The deterioration factors of insulators are thought to be thermal deterioration, electrical deterioration, mechanical deterioration, and environmental chemical deterioration, but in the case of AC motors in particular, the electromagnetic force caused by starting ttlL at startup causes a large amount of damage to the coil end. Mechanical stress is generated, and this mechanical deterioration is the main factor, and the combination of thermal deterioration and environmental chemical deterioration tends to cause defects in the coil end portion. In fact, when conducting dielectric breakdown tests on equipment that has been used for a long period of time, flash shorts often occur from the coil end to the ground.
しかるに絶縁の劣化度を検出する場合、絶縁物を乾燥さ
せて吸湿していない状態、すなわち第１図に示す表面抵
抗Ｒｓが大きい状態では、上述のように劣化の受けやす
いコイルエンドの絶縁（絶縁特性としてはＴａｎδ２で
表わされる部分）に電圧が印加されず、コイルエンド部
に欠陥があっても検出不可能である。この場合でも水素
冷却のタービン発電機のようにコイル表面が清浄に保た
れている場合はフィルエンド部の絶縁劣化が問題となる
ことはないので、スロット部絶縁の劣化度を検出するこ
とにより（絶縁特性としてｆＸ Ｔａｎδ１で表わされ
る部分）良好な絶縁診断が可能ではあるが、空気冷却方
式のように、湿′度、塵埃、汚損にさらされる回転機の
場合は、汚損状態の程度によりコイル表面抵抗Ｒ８が種
々変化し、絶縁特性においてスロット部のＴａｎδ１
に対するエンド部のＴａｎδ！の検出値への混入程度が
一様でないため、真の絶縁状態の判断がつきに（い。However, when detecting the degree of deterioration of insulation, when the insulator is dry and does not absorb moisture, that is, when the surface resistance Rs shown in Fig. 1 is large, the coil end insulation (insulation As a characteristic, no voltage is applied to the portion represented by Tan δ2, and even if there is a defect in the coil end, it cannot be detected. Even in this case, if the coil surface is kept clean like in a hydrogen-cooled turbine generator, insulation deterioration at the fill end will not be a problem, so by detecting the degree of deterioration of the slot insulation, Although it is possible to perform a good insulation diagnosis (the part expressed as fX Tanδ1 as the insulation property), in the case of rotating machines that are exposed to humidity, dust, and dirt, such as those using air cooling systems, the coil surface may be damaged depending on the degree of dirt. Resistance R8 changes variously, and Tan δ1 of the slot part changes in insulation properties.
Tanδ of the end portion for Since the degree of contamination in the detected value is not uniform, it is difficult to judge the true insulation state.
このような理由からＴａｎδ特性と絶縁劣化度の実測値
もしくは絶縁破壊値との相関性が得られず、その実測値
から絶縁診断を行うことはできなかった。第一図を工こ
の’Ｉ’ａｎδ特性と絶縁破壊値ＢＤＶとの関係を示す
図であり、供試物としてはフレークマイカ、ポリエステ
ル真空含浸レジンコイルの運転経過年数ｉｏ、−２０年
のものを使用した。第２図において、縦軸は絶縁破壊値
ＢＤＶ（チ）を、横軸はΔＴａｎ δ（１←〔定格電圧
におけるＴａ、ｎδ〕−（／ ＫＶにおけるＴａｎδ〕
）を示す。絶縁破壊値ｉｏθチは初期の破壊電圧値を表
わしている。この第２図のプロットからもΔＴａｎδと
ＢＤＶ との間に明確な相関性を特定することができず
、絶縁診断の行うことができないのが解る。For these reasons, it has not been possible to obtain a correlation between the Tan δ characteristics and the measured value of the degree of insulation deterioration or the dielectric breakdown value, and it has not been possible to perform insulation diagnosis from the measured values. Figure 1 is a diagram showing the relationship between the 'I'anδ characteristics and the dielectric breakdown value BDV.The test specimens are flake mica and polyester vacuum impregnated resin coils with an operating age of -20 years. used. In Fig. 2, the vertical axis is the dielectric breakdown value BDV (chi), and the horizontal axis is ΔTan δ (1← [Ta, nδ at rated voltage] - (Tan δ at / KV)
) is shown. The dielectric breakdown value ioθ represents the initial breakdown voltage value. It can be seen from the plot of FIG. 2 that no clear correlation can be identified between ΔTanδ and BDV, and insulation diagnosis cannot be performed.
以上はΔＴａｎδとＢＤＶの関係についてのみ説明した
が、同様に部分放電開始電圧Ｃ＋ＳＶ と絶縁破壊値Ｂ
Ｄ■（チ）との間（第３図）、および部分数を最大電荷
量ＱＭＡＩと絶縁破壊値ＢＤＶ との間（第グ図）Ｋも
絶縁診断な可能とするような相関性がない。The above has only explained the relationship between ΔTanδ and BDV, but similarly, partial discharge inception voltage C+SV and dielectric breakdown value B
There is also no correlation between the maximum charge amount QMAI and the dielectric breakdown value BDV (Fig. G) and K (Fig. 3) that would enable insulation diagnosis.
以上のように従来の診断法でをニ一般的手段による非破
壊特性と絶縁破壊値の相関性が得られず。As mentioned above, it is not possible to obtain a correlation between non-destructive properties and dielectric breakdown values using conventional diagnostic methods.
絶縁劣化の推定もしくは診断に困雌であった。It was difficult to estimate or diagnose insulation deterioration.
この発明は上記のような従来のものの欠点を除去するた
めに為されたもので、巻線が置かれている環境状態の差
異すなわち乾燥状態と吸湿状態との絶縁特性の差異に注
目して絶縁劣化の推定を可能とした絶縁診断方法を提供
することを目的としている。This invention was made to eliminate the above-mentioned drawbacks of the conventional method, and focuses on the difference in the environmental conditions in which the winding is placed, that is, the difference in insulation properties between a dry state and a moisture-absorbed state. The purpose of this invention is to provide an insulation diagnosis method that makes it possible to estimate deterioration.
すなわち、絶縁劣化度の進んだ絶縁物は吸湿状態におい
てはその絶縁抵抗値が極端罠低下するのでその乾燥状態
と吸湿状態の抵抗値の差異を測定することにより絶縁劣
化度を診断しようとするものである。In other words, the insulation resistance value of an insulator with advanced insulation deterioration drops dramatically when it absorbs moisture, so the degree of insulation deterioration can be diagnosed by measuring the difference in resistance value between the dry state and the moisture absorption state. It is.
以下、この発明の実楕例について説明する。Hereinafter, an actual example of this invention will be explained.
フレークマイカ構造、ポリエステルレジン真空含浸コイ
ルよりなる固定子巻線のもので、運転年数１０Ｓ２０年
、容量夕０θＸＷ−λ０００ ＫＷのモーター１０台を
選んで次のテストを実施した。The following tests were conducted on 10 motors with a flake mica structure and a stator winding made of polyester resin vacuum-impregnated coils, operating years of 10 to 20 years, and a capacity of 0θXW-λ000 KW.
ステップ−７）湿度１００チ、温度６０℃の蒸気中に巻
線を７２時間暴露し、蒸気槽から取出した後、直ちに絶
縁抵抗Ｒｈ ｕｍ を測定した。Step-7) The windings were exposed to steam at a humidity of 100 degrees and a temperature of 60 degrees Celsius for 72 hours, and immediately after being taken out from the steam bath, the insulation resistance Rh um was measured.
ステップーコ）その後、巻線を蒸気噴射洗浄し。After that, the windings are cleaned by steam injection.
−／３！”Ｃ，，１４時間水切乾燥し１巻線温度が室温
にもどってから、再び絶縁抵抗Ｒｄ ｒ ｙ を測定し
た。-/3! After draining and drying for 14 hours and the temperature of the first winding returning to room temperature, the insulation resistance Rd ry was measured again.
ステップ−Ｊ）日出線より高電圧（ｋｃＡＯＨ２）を印
加しく三相一括にて実施）、／ＫＶ／秒の電圧上昇法に
よって絶縁の破壊電圧値を測定した。Step-J) A high voltage (kcAOH2) was applied from the Hiji Line to three phases at once), and the breakdown voltage value of the insulation was measured by the voltage increase method of /KV/sec.
以上の結果を第３図に示す。The above results are shown in FIG.
縦軸は対地間交流破壊電圧値を示し、初期の値を１００
チとした。The vertical axis shows the AC breakdown voltage value to ground, and the initial value is 100
It was hot.
横軸は乾燥後の絶縁抵抗Ｒｄｒｙ と吸湿後の絶縁抵
抗Ｒｈ ｕｍ の比をとり、その対数ｌｏｇ （Ｒｄｒ
ｙ／Ｒｈｕｍ）で表わした。The horizontal axis is the ratio of the insulation resistance Rdry after drying to the insulation resistance Rh um after moisture absorption, and its logarithm log (Rdr
y/Rhum).
第３図のプロットから分るように絶縁抵抗の上記比と絶
縁破壊値との間には、具体的な相関関係があり、従って
絶縁抵抗の比を知れば、第Ｓ図のグラフから絶縁破壊強
度を推定できることとなる。As can be seen from the plot in Figure 3, there is a specific correlation between the above ratio of insulation resistance and the dielectric breakdown value. This means that the strength can be estimated.
横軸の値が２−３すなわち抵抗値比が７０２ 〜１０
倍では、初期値のｔｒｏＳｂ（１７＠の電圧値で絶縁
破壊し、横軸の値が３以上すなわち１０００倍以上では
初期の破壊電圧値の半分以下に絶縁強度が低下するのが
第Ｓ図から分る。The value on the horizontal axis is 2-3, that is, the resistance value ratio is 702 to 10.
Figure S shows that when the voltage is doubled, dielectric breakdown occurs at a voltage value of the initial value troSb (17@), and when the value on the horizontal axis is 3 or more, that is, 1000 times or more, the insulation strength decreases to less than half of the initial breakdown voltage value. I understand.
なお上記実施例でを工、巻線を強制吸湿または乾燥させ
て絶縁抵抗値を測定するものについて述べたが、通常、
プラントに据付けられた状態においても、環境の変動（
例えば湿度の変動）Ｋおける絶縁抵抗値を定期的に測定
し、そのデータから最近の吸湿状態の絶縁抵抗値と乾燥
状態の絶縁抵抗値との比を判断するようにしても良い。In the above embodiment, the insulation resistance value is measured by forcing the winding to absorb moisture or drying.
Even when installed in a plant, changes in the environment (
For example, the insulation resistance value due to humidity fluctuations may be periodically measured, and the ratio between the insulation resistance value in the recent moisture absorption state and the insulation resistance value in the dry state may be determined from the data.
さらに、運転停止直後の温度の高い状態、および停止中
の湿度の低い状態での絶縁抵抗値の差異から絶縁劣化度
を判断するようにしても良い。Furthermore, the degree of insulation deterioration may be determined from the difference in insulation resistance value between a high temperature state immediately after the operation is stopped and a low humidity state during the operation stop.
以上のようにこの発明によれば、吸湿後と乾燥後の絶縁
抵抗を測定し、その差異を知ることにより、絶縁破壊強
度を推定することが可能である。As described above, according to the present invention, it is possible to estimate the dielectric breakdown strength by measuring the insulation resistance after moisture absorption and after drying and knowing the difference.
第１図を子巻線絶縁物の等両回路を示す図、第２図を工
ΔＴａｎδと絶縁破壊電圧ＢＤＶ との相関性を示す
図、第３図は部分放電開始電圧Ｃ８Ｖ と絶縁破壊電圧
ＢＤＶ との相関性を示す図、第ｑ図は最大放電々荷量
Ｑ ＭＡＹと絶縁破壊電圧ＢＤＶ との相関性を示す図
、第Ｓ図はこの発明の一実施例によって得られた。乾燥
および吸湿状態の絶縁抵抗値の比ｌｏｇ （Ｒｄｒｙ
／ Ｒｈｕｍ ）と絶縁破壊電圧ＢＤＶとの相関性を示
す図である。図において、Ｔａｎ ａ。
をニスロット部のＴａｎ 、ＩＪ 、 Ｔａｎδ はコ
イルエンド部のＴａｎδ、 Ｒ８ｔＸコイルエンド表面
の表面抵抗である。
代 理 人 葛 野 信 −幣１図
ｓFigure 1 is a diagram showing the circuit of the child winding insulator, Figure 2 is a diagram showing the correlation between ΔTanδ and dielectric breakdown voltage BDV, and Figure 3 is a diagram showing the partial discharge inception voltage C8V and dielectric breakdown voltage BDV. Figure q is a diagram showing the correlation between the maximum discharge charge QMAY and dielectric breakdown voltage BDV, and Figure S was obtained by an embodiment of the present invention. Rdry Rdry Rdry
/Rhum) and dielectric breakdown voltage BDV. In the figure, Tan a. Tan, IJ, and Tanδ of the slotted part are Tanδ of the coil end, and are the surface resistance of the R8tX coil end surface. Agent Makoto Kuzuno - Figure 1 s
Claims (1)
１定し。 前記絶縁物の吸湿状態における抵抗値をＭｌ：定し、前
記絶縁物の破壊電圧値を測定し、前記吸ｌ髭状態の抵抗
値に対する前記乾燥状態の抵抗値の比と、前記破壊電圧
値との相関関係を求め、前記抵抗値の比から前記相関関
係を用いて前記絶縁物の劣化程度を診断するようにした
ことを特徴とする絶縁診断方法。 （２） 前記乾燥状態および吸湿状態の抵抗値の６１
１１定ａ、前記絶縁物を強制的にそれぞれ乾燥状態およ
び吸湿状態の中に置いて行われるようにした特許請求の
範囲第１項記載の絶縁診断方法。 （３） 前記乾燥状態および吸湿状態の抵抗値は、実
使用状態にある前記絶縁物の抵抗値およびその絶縁物の
置かれた環境中の湿度を定期的に測定することにより、
その測定データから判断されるよ５Ｋした特許請求の範
囲第１項記載の絶縁診断方法。[Claims] +11 What is the resistance value of the insulator in a dry state? 111
Fixed at 1. The resistance value of the insulator in the moisture absorption state is determined as Ml, the breakdown voltage value of the insulator is measured, and the ratio of the resistance value in the dry state to the resistance value in the moisture absorption state is determined as the breakdown voltage value. An insulation diagnosis method, characterized in that the degree of deterioration of the insulator is diagnosed using the correlation based on the ratio of the resistance values. (2) 61 of the resistance value in the dry state and moisture absorption state
11. The insulation diagnosis method according to claim 1, wherein the insulation diagnosis is performed by forcibly placing the insulator in a dry state and a moisture absorbing state, respectively. (3) The resistance value in the dry state and the moisture absorption state can be determined by periodically measuring the resistance value of the insulator in actual use and the humidity in the environment in which the insulator is placed.
5. The insulation diagnosis method according to claim 1, wherein the insulation diagnosis is 5K as determined from the measurement data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56154447A JPS5855768A (en) | 1981-09-28 | 1981-09-28 | Insulation diagnosing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56154447A JPS5855768A (en) | 1981-09-28 | 1981-09-28 | Insulation diagnosing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5855768A true JPS5855768A (en) | 1983-04-02 |
Family
ID=15584404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56154447A Pending JPS5855768A (en) | 1981-09-28 | 1981-09-28 | Insulation diagnosing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5855768A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771580A (en) * | 1995-09-29 | 1998-06-30 | Sanyo Electric Co., Ltd. | Electric razor |
| US7111983B2 (en) * | 2004-04-13 | 2006-09-26 | Reliance Electric Technologies, Llc | Temperature detection method and apparatus for inverter-driven machines |
-
1981
- 1981-09-28 JP JP56154447A patent/JPS5855768A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771580A (en) * | 1995-09-29 | 1998-06-30 | Sanyo Electric Co., Ltd. | Electric razor |
| US7111983B2 (en) * | 2004-04-13 | 2006-09-26 | Reliance Electric Technologies, Llc | Temperature detection method and apparatus for inverter-driven machines |
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