JPH0772199A - Cable insulation diagnosis method and device - Google Patents
Cable insulation diagnosis method and deviceInfo
- Publication number
- JPH0772199A JPH0772199A JP21733893A JP21733893A JPH0772199A JP H0772199 A JPH0772199 A JP H0772199A JP 21733893 A JP21733893 A JP 21733893A JP 21733893 A JP21733893 A JP 21733893A JP H0772199 A JPH0772199 A JP H0772199A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- insulation
- measured
- temperature
- residual
- 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.)
- Withdrawn
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は艦船、商船、陸上機器等
のケーブル絶縁診断方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable insulation diagnosis method and device for ships, merchant ships, land equipment and the like.
【０００２】[0002]
【従来の技術】従来の残留電圧方法によるケーブル絶縁
診断装置を図３に示す。直流電源６の一端子はアースさ
れるとともに計測対象ケーブル１０につながれている。
また他の端子は切替スイッチ１を介して抵抗１２を経て
計測対象ケーブル１０につながれている。ケーブル１０
と抵抗１２間の分岐点ｂとアースライン間はスイッチ２
を介してつながれる。また分岐点とアースライン間には
切替スイッチ３を介して残留電圧計１３がつながれる。
切替スイッチ１，３の他の端子はアースされている。図
中Ｃ，Ｒはケーブルの等価静電容量、等価絶縁抵抗であ
る。2. Description of the Related Art FIG. 3 shows a conventional cable insulation diagnostic device using a residual voltage method. One terminal of the DC power supply 6 is grounded and also connected to the cable 10 to be measured.
Further, the other terminal is connected to the cable 10 to be measured via the changeover switch 1 and the resistor 12. Cable 10
Switch 2 between the branch point b between the resistor and the resistor 12 and the ground line
Connected through. A residual voltmeter 13 is connected between the branch point and the earth line via the changeover switch 3.
The other terminals of the changeover switches 1 and 3 are grounded. In the figure, C and R are the equivalent capacitance and equivalent insulation resistance of the cable.
【０００３】以上において、残留電圧法による計測は次
のように行われる。スイッチ２を開き、スイッチ３を接
地したのち、スイッチ１によって直流電源６の電圧Ｅを
計測対象ケーブル１０に印加する。直流電圧Ｅは１ＫＶ
／mm×絶縁厚、印加時間は１０分間が適当とされてい
る。その後、スイッチ１を接地し、続いてスイッチ２を
接地して過渡電流を零とし、さらにスイッチ２を開い
て、スイッチ３をケーブル１０側に入れて残留電圧ｖc
を電圧計１３で計測する。In the above, the measurement by the residual voltage method is performed as follows. After the switch 2 is opened and the switch 3 is grounded, the switch 1 applies the voltage E of the DC power supply 6 to the measurement target cable 10. DC voltage E is 1KV
/ Mm x insulation thickness, and application time of 10 minutes is appropriate. After that, the switch 1 is grounded, and then the switch 2 is grounded so that the transient current becomes zero, the switch 2 is further opened, and the switch 3 is put in the cable 10 side so that the residual voltage v c
Is measured by the voltmeter 13.
【０００４】図２のように残留電圧ｖc が印加電圧Ｅの
６０〜８０％になる時間を測定し、所定値以上なら絶縁
良と判定する。As shown in FIG. 2, the time when the residual voltage v c becomes 60 to 80% of the applied voltage E is measured, and if it is a predetermined value or more, it is judged that the insulation is good.
【０００５】図４にケーブルの断面図を示す。図中、１
５が芯線、１６が絶縁体、１７が破断である。なお絶縁
不良は次の場合に発生する。FIG. 4 shows a sectional view of the cable. 1 in the figure
5 is a core wire, 16 is an insulator, and 17 is a fracture. The insulation failure occurs in the following cases.
【０００６】（ａ）絶縁体が破損し、外部導体と接触す
る。(A) The insulator is damaged and comes into contact with the outer conductor.
【０００７】（ｂ）絶縁体が化学変化し絶縁不良とな
る。(B) The insulator is chemically changed, resulting in poor insulation.
【０００８】（ｃ）絶縁体の破損部に水分、ゴミが付着
する。(C) Water and dust adhere to the damaged portion of the insulator.
【０００９】[0009]
【発明が解決しようとする課題】上記従来の残留電圧方
法は測定時間が１０〜３０分と長く、又温度による測定
時間変化の補正がないので十分な精度が得られなかっ
た。The conventional residual voltage method described above has a long measuring time of 10 to 30 minutes, and since the measuring time change due to temperature is not corrected, sufficient accuracy cannot be obtained.
【００１０】[0010]
【課題を解決するための手段】本発明は上記課題を解決
するため次の手段を講ずる。The present invention takes the following means in order to solve the above problems.
【００１１】すなわち、 （１）残留電圧方法によるケーブル絶縁診断方法におい
て、初期の複数時刻での残留電圧を計測し同残留電圧が
規定の電圧になる時間を推定するとともに上記ケーブル
の温度を計測して同温度により上記規定の電圧になる時
間を補正するようにしたケーブル絶縁診断方法。That is, (1) In the cable insulation diagnosis method by the residual voltage method, the residual voltage at a plurality of initial times is measured, the time when the residual voltage becomes a specified voltage is estimated, and the temperature of the cable is measured. A cable insulation diagnosis method that corrects the time for the voltage to reach the specified value according to the same temperature.
【００１２】（２）残留電圧計を有する残留電圧方法に
よるケーブル絶縁診断装置において、計測対象ケーブル
の絶縁部の温度を検出する温度センサと、同温度センサ
の出力を受け、上記計測対象ケーブルに応じた絶縁抵抗
補正信号を出力する絶縁抵抗補正器と、同絶縁抵抗補正
器および上記残留電圧計の出力を受け上記計測対象ケー
ブルの標準温度での残留電圧が規定の電圧になる時間を
演算推定し出力する測定時間推定器とを備えてなるケー
ブル絶縁診断装置。(2) In a cable insulation diagnostic device using a residual voltage method having a residual voltage meter, a temperature sensor for detecting the temperature of an insulating portion of a cable to be measured and the output of the temperature sensor are received, and the cable is measured according to the cable to be measured. The insulation resistance corrector that outputs the insulation resistance correction signal and the output of the insulation resistance corrector and the residual voltmeter are used to calculate and estimate the time for the residual voltage at the standard temperature of the cable to be measured to reach the specified voltage. A cable insulation diagnostic device comprising a measuring time estimator for outputting.
【００１３】[0013]
（１）上記発明１において、計測対象ケーブルの初期の
複数時刻での残留電圧が計測される。そして残留電圧が
規定の電圧になるまでの時間が推定される。さらにケー
ブルの絶縁材の温度が同時に計測され、上記推定された
時間が絶縁材の抵抗が標準温度時の値のときのものにな
るよう補正される。(1) In Invention 1, the residual voltage of the cable to be measured at multiple initial times is measured. Then, the time until the residual voltage reaches the specified voltage is estimated. Further, the temperature of the insulating material of the cable is simultaneously measured, and the estimated time is corrected so that the resistance of the insulating material is the value at the standard temperature.
【００１４】このようにして、短時間でかつ常に温度補
正された精度の高い値がえられる。In this way, the temperature-corrected and highly accurate value can be obtained in a short time.
【００１５】（２）上記発明２において、温度センサに
より計測対象ケーブルの絶縁部の温度が検出される。絶
縁抵抗補正器は温度センサの出力を受け、計測対象ケー
ブルの絶縁材に応じた標準温度での絶縁抵抗値になるよ
うな、絶縁抵抗補正信号を出力する。測定時間推定器
は、絶縁抵抗補正器および残留電圧計の出力を受け、計
測対象ケーブルの標準温度での残留電圧が規定の電圧に
なるまでの時間を演算推定し出力する。(2) In the above invention 2, the temperature of the insulation portion of the cable to be measured is detected by the temperature sensor. The insulation resistance corrector receives the output of the temperature sensor and outputs an insulation resistance correction signal such that the insulation resistance value at the standard temperature corresponds to the insulation material of the cable to be measured. The measurement time estimator receives the outputs of the insulation resistance corrector and the residual voltmeter, calculates and estimates the time until the residual voltage at the standard temperature of the cable to be measured reaches a specified voltage, and outputs the calculated time.
【００１６】このようにして、短時間で、かつ常に温度
補正された精度の高い値がえられる。In this way, the temperature-corrected and highly accurate value can be obtained in a short time.
【００１７】[0017]
【実施例】本発明の一実施例を図１、図２により説明す
る。なお、従来例で説明した部分は、同一の番号をつけ
説明を省略し、この発明に関する部分を主体に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. It should be noted that the parts described in the conventional example are denoted by the same reference numerals and the description thereof is omitted, and the parts relating to the present invention will be mainly described.
【００１８】図１にて、計測対象ケーブル１０の絶縁材
の温度を検出する温度センサ７の出力は絶縁抵抗補正器
８へ送られる。また絶縁抵抗補正器８の出力は測定時間
推定器９へ送られる。さらに残留電圧計１３の出力は測
定時間推定器９へ送られる。測定時間推定器９の出力は
表示器１４へ送られる。In FIG. 1, the output of the temperature sensor 7 for detecting the temperature of the insulating material of the cable 10 to be measured is sent to the insulation resistance corrector 8. The output of the insulation resistance corrector 8 is sent to the measurement time estimator 9. Further, the output of the residual voltmeter 13 is sent to the measurement time estimator 9. The output of the measurement time estimator 9 is sent to the display 14.
【００１９】以上において、絶縁抵抗補正器８には予め
表１に示すような絶縁材料の種類毎に各温度の温度補正
係数が入力記憶されている。そして、計測対象ケーブル
１０の絶縁材の名称を指定入力する。すると例えば、絶
縁材がＥＰゴムの場合、温度センサ７の出力が２℃なら
ば、標準温度２０℃に対応する０．４５の絶縁抵抗補正
信号が出力される。In the above, the insulation resistance compensator 8 is pre-stored with the temperature correction coefficient for each temperature for each type of insulating material as shown in Table 1. Then, the name of the insulating material of the measurement target cable 10 is designated and input. Then, for example, when the insulating material is EP rubber and the output of the temperature sensor 7 is 2 ° C., an insulation resistance correction signal of 0.45 corresponding to the standard temperature of 20 ° C. is output.
【００２０】[0020]
【表１】 [Table 1]
【００２１】次に測定時間推定器９の作用原理を説明す
る。計測対象ケーブル１０のＲＣ等価回路から残留電圧
ｖc の時間特性は、図２に示すように式（１）で表され
る。Next, the principle of operation of the measuring time estimator 9 will be described. The time characteristic of the residual voltage v c from the RC equivalent circuit of the measurement target cable 10 is represented by the equation (1) as shown in FIG.
【００２２】 ｖc ＝Ｅｅｘｐ（−ｔ／ＣＲ） ………（１） ここに、Ｅは直流電源６の電圧 式（１）をｔ＝１０（秒）、２０（秒）、３０（秒）の
とき、テイラー級数展開を行い、電圧降下率ＣＲを求め
ると、式（２）〜（４）がえられる。[0022] v c = Eexp (-t / CR ) ......... (1) Here, the voltage equation (1) to t = 10 in E is the DC power supply 6 seconds, 20 seconds, 30 seconds At this time, if Taylor series expansion is performed and the voltage drop rate CR is obtained, equations (2) to (4) are obtained.
【００２３】 ｖ10c ＝Ｅ｛１−10/CR ＋1/2 ！(10/CR)2−1/3 ！(10/CR)3｝………（２） ｖ20c ＝Ｅ｛１−20/CR ＋1/2 ！(20/CR)2−1/3 ！(20/CR)3｝………（３） ｖ30c ＝Ｅ｛１−30/CR ＋1/2 ！(30/CR)2−1/3 ！(30/CR)3｝………（４） （２）〜（４）式を整理すると、（５）式のようにな
る。V 10c = E {1-10 / CR +1/2! (10 / CR) 2 −1/3! (10 / CR) 3 } ……… (2) v 20c = E {1-20 / CR ＋1/2! (20 / CR) 2 −1/3! (20 / CR) 3 ………… (3) v 30c = E {1-30 / CR ＋1/2! (30 / CR) 2 −1/3! (30 / CR) 3 } ……… (4) When formulas (2) to (4) are rearranged, formula (5) is obtained.
【００２４】 ＣＲ＝６０Ｅ／Ａ−２５Ｅ ………（５） ここでＡ＝７２ｖ10c −６３ｖ20c ＋８ｖ30c である。CR = 60E / A-25E (5) where A = 72v 10c −63v 20c + 8v 30c .
【００２５】よってｔ＝１０（秒）、２０、３０のとき
のｖc の値をとれば電圧降下率ＣＲを求めることができ
る。従って、例えばｖc が６０％に降下するまでの推定
時間ｔ2 は式（１ａ）の関係を持つ。Therefore, the voltage drop rate CR can be obtained by taking the value of v c at t = 10 (seconds), 20 and 30. Thus, for example, v estimated time t 2 until c drops to 60% have a relationship of the formula (1a).
【００２６】 ０．６Ｅ＝Ｅｅｘｐ（−ｔ2 ／ＲＣ） …………（１ａ） ここで、Ｒすなわちｔ2 に絶縁抵抗補正信号を掛けれ
ば、標準温度での値に温度補正された推定時間ｔ2 ′が
算出される。0.6E = Eexp (−t 2 / RC) (1a) Here, if R, that is, t 2 is multiplied by the insulation resistance correction signal, the estimated time when the temperature is corrected to the value at the standard temperature is obtained. t 2 ′ is calculated.
【００２７】また表示器１４は推定時間ｔ2 ′を表示す
るとともに、この時間ｔ2 ′が予め設定された時間以上
のとき、絶縁良の表示を、また未満のとき絶縁否の表示
を行う。Further, the display 14 displays the estimated time t 2 ′, and when the time t 2 ′ is a preset time or more, the display shows that the insulation is good, and when the time t 2 ′ is less than this, it shows the insulation failure.
【００２８】このようにして、残留電圧の計測開始後、
わずか３０秒で、精度のよい絶縁の診断ができる。In this way, after the measurement of the residual voltage is started,
Accurate insulation diagnosis is possible in only 30 seconds.
【００２９】以上では初期の３０秒で推定をしたが、も
う少し経過時間をとり推定精度をより高めるようにして
もよい。In the above, the estimation was made in the initial 30 seconds, but it is also possible to take a little more elapsed time to improve the estimation accuracy.
【００３０】[0030]
【発明の効果】以上に説明したように本発明によれば、
初期の短時間の残留電圧の変化から、規定値まで下る時
間を推定するので、極めて短時間でケーブル絶縁診断が
可能となる。As described above, according to the present invention,
Since the time required to reach the specified value is estimated from the change in the residual voltage in the initial short time, the cable insulation diagnosis can be performed in an extremely short time.
【００３１】また温度補正されるので、その精度が向上
する。Further, since the temperature is corrected, its accuracy is improved.
【図１】本発明の一実施例の構成回路図である。FIG. 1 is a configuration circuit diagram of an embodiment of the present invention.
【図２】同実施例および従来例の作用説明図である。FIG. 2 is an operation explanatory view of the embodiment and the conventional example.
【図３】従来例の構成回路図である。FIG. 3 is a configuration circuit diagram of a conventional example.
【図４】同従来例のケーブル断面模式図である。FIG. 4 is a schematic sectional view of a cable of the conventional example.
１，３ 切替スイッチ ２ スイッチ ４ ケーブル等価回路 ７ 温度センサ ８ 絶縁抵抗補正器 ９ 測定時間推定器 １０ 計測対象ケーブル １３ 残留電圧計 １４ 表示器 1, 3 Changeover switch 2 Switch 4 Cable equivalent circuit 7 Temperature sensor 8 Insulation resistance corrector 9 Measurement time estimator 10 Measurement target cable 13 Residual voltmeter 14 Indicator
Claims (2)
法において、初期の複数時刻での残留電圧を計測し同残
留電圧が規定の電圧になる時間を推定するとともに上記
ケーブルの温度を計測して同温度により上記規定の電圧
になる時間を補正することを特徴とするケーブル絶縁診
断方法。1. In a cable insulation diagnosis method using a residual voltage method, the residual voltage at a plurality of initial times is measured, the time at which the residual voltage reaches a specified voltage is estimated, and the temperature of the cable is measured to obtain the same temperature. A cable insulation diagnosis method, characterized in that the time to reach the above specified voltage is corrected by.
ケーブル絶縁診断装置において、計測対象ケーブルの絶
縁部の温度を検出する温度センサと、同温度センサの出
力を受け、上記計測対象ケーブルに応じた絶縁抵抗補正
信号を出力する絶縁抵抗補正器と、同絶縁抵抗補正器お
よび上記残留電圧計の出力を受け上記計測対象ケーブル
の標準温度での残留電圧が規定の電圧になる時間を演算
推定し出力する測定時間推定器とを備えてなることを特
徴とするケーブル絶縁診断装置。2. A cable insulation diagnostic apparatus using a residual voltage method having a residual voltage meter, which receives a temperature sensor for detecting a temperature of an insulating portion of a cable to be measured and an output of the temperature sensor and responds to the cable to be measured. Insulation resistance corrector that outputs an insulation resistance correction signal, receives the output of the insulation resistance corrector and the above residual voltmeter, and calculates and outputs the time when the residual voltage at the standard temperature of the cable to be measured becomes the specified voltage. And a cable insulation diagnostic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21733893A JPH0772199A (en) | 1993-09-01 | 1993-09-01 | Cable insulation diagnosis method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21733893A JPH0772199A (en) | 1993-09-01 | 1993-09-01 | Cable insulation diagnosis method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0772199A true JPH0772199A (en) | 1995-03-17 |
Family
ID=16702614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21733893A Withdrawn JPH0772199A (en) | 1993-09-01 | 1993-09-01 | Cable insulation diagnosis method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772199A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154121A (en) * | 2015-03-30 | 2016-11-23 | 北京航天计量测试技术研究所 | A kind of cable system insulating fault diagnosis method |
-
1993
- 1993-09-01 JP JP21733893A patent/JPH0772199A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154121A (en) * | 2015-03-30 | 2016-11-23 | 北京航天计量测试技术研究所 | A kind of cable system insulating fault diagnosis method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001107 |