JPH0316625B2 - - Google Patents
Info
- Publication number
- JPH0316625B2 JPH0316625B2 JP57083735A JP8373582A JPH0316625B2 JP H0316625 B2 JPH0316625 B2 JP H0316625B2 JP 57083735 A JP57083735 A JP 57083735A JP 8373582 A JP8373582 A JP 8373582A JP H0316625 B2 JPH0316625 B2 JP H0316625B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- insulation
- frequency power
- current
- power source
- 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 - Lifetime
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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【発明の詳細な説明】
この発明は、クレーン等で使用されるリフテイ
ングマグネツト等のインダクタンス負荷に電流を
供給するケーブルの絶縁不良を検出する絶縁不良
検出方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation failure detection method for detecting insulation failure in a cable that supplies current to an inductance load such as a lifting magnet used in a crane or the like.
第１図は、クレーン等で使用されるリフテイン
グマグネツト（以下、リフマグと略称する）の電
流供給装置の構成を示す図であり、１は電源制御
盤、２ａ，２ｂは電源制御盤１に設けられた直流
電源出力端子である。出力端子２ａ，２ｂは、ケ
ーブル３、ケーブル巻込用ドラム４に巻回された
ケーブル５、コネクタ６を介してリフマグ７のコ
イルに接続されている。また、これらの構成要素
のうち、電源制御盤１、ケーブル３、ドラム４は
クレーン本体上に設置されており、ケーブル５、
コネクタ６、リフマグ７はクレーンより吊り下げ
られている。このような構成において電源制御盤
１から出力された直流電流は、ケーブル３と５、
コネクタ６を介してリフマグ７へ供給され、この
リフマグ７を励磁する。また、リフマグ７は物品
を磁気により吸引し吊り上げ、搬送する。 Fig. 1 is a diagram showing the configuration of a current supply device for a lifting magnet (hereinafter referred to as Lifmag) used in a crane, etc., in which 1 is a power control panel, 2a and 2b are connected to the power control panel 1. This is a DC power output terminal provided. The output terminals 2a and 2b are connected to a coil of a riffmag 7 via a cable 3, a cable 5 wound around a cable winding drum 4, and a connector 6. Among these components, the power control panel 1, cable 3, and drum 4 are installed on the crane body, and the cable 5,
The connector 6 and the riffmag 7 are suspended from a crane. In such a configuration, the DC current output from the power control panel 1 is transmitted through the cables 3 and 5,
It is supplied to the riff mag 7 via the connector 6, and energizes the riff mag 7. Furthermore, the riffmag 7 magnetically attracts, lifts, and transports articles.
ところで、リフマグ７の巻き上げ、巻き下げ作
業においては、ケーブル５にネジレや引張り応力
が加えられ、このため、ケーブル５が損傷するこ
とが多いこの場合、通常ケーブル５に線間短絡を
生じさせ、リフマグ７を励磁している直流電流が
切れ、物品を搬送中であれば吊り落し、下で作業
している人間や機械に大きな損傷を与える。この
ような事故を防止するには、ケーブル５を定期的
に変換し、ケーブル３，５の線間絶縁抵抗を定期
的に測定し、ケーブル３，５の状態を把握する必
要がある。 By the way, during the work of hoisting up and lowering the Riff Mag 7, torsion and tensile stress are applied to the cable 5, and as a result, the cable 5 is often damaged. The direct current that excites the item 7 is cut off, causing the item to fall if it is being transported, causing major damage to people and machinery working below. In order to prevent such accidents, it is necessary to periodically change the cable 5, periodically measure the inter-line insulation resistance of the cables 3 and 5, and grasp the condition of the cables 3 and 5.
しかしながら、上述のケーブル３，５の線間絶
縁抵抗の定期点検においては、次のような欠点が
あつた。 However, the following drawbacks occurred in the above-mentioned periodic inspection of the inter-line insulation resistance of the cables 3 and 5.
直流を電源として用いている通常の絶縁抵抗
計で測定する場合、リフマグ７のコイル抵抗は
絶縁抵抗に比較して極めて小さいので、リフマ
グ７をケーブル５からその都度はずして測定し
なければならない。そのため、人員と時間がか
かり、月に１回程度測定しているだけである。 When measuring with a normal insulation resistance tester that uses DC as a power source, the coil resistance of the Riff Mag 7 is extremely small compared to the insulation resistance, so the Riff Mag 7 must be removed from the cable 5 each time it is measured. Therefore, it takes time and manpower, and measurements are only performed about once a month.
の方法ではコネクタ６、コネクタ６とリフ
マグ７との間のケーブルおよびリフマグ７の絶
縁劣化は検出できない。 In this method, insulation deterioration of the connector 6, the cable between the connector 6 and the riff mag 7, and the rif mag 7 cannot be detected.
この発明は、上述の事情に鑑み、インダクタン
ス負荷を取りはずすことなく、ケーブルおよびイ
ンダクタンス短絡に至る前の負荷の絶縁抵抗の劣
化を検出することを可能にする絶縁不良検出方法
を提供するもので、ケーブルの線間へ高周波電源
の出力を供給し、この高周波電源の出力電流に基
づいて、絶縁不良を検出することを特徴とする。 In view of the above-mentioned circumstances, the present invention provides an insulation failure detection method that makes it possible to detect deterioration of the insulation resistance of a cable and a load before an inductance short circuit occurs without removing the inductance load. The output of a high-frequency power source is supplied between the lines of the high-frequency power source, and an insulation defect is detected based on the output current of the high-frequency power source.
以下、図面に基づいて本発明の実施例を説明す
る。 Embodiments of the present invention will be described below based on the drawings.
第２図は本発明の一実施例を示す図であり、図
において第１図の各部に対応する部分には同一の
符号を付し、その説明を省略する。９は高周波電
源で、その一端９ａは、電流計１０、電源オン・
オフ用マグネツトスイツチのインターロツク用接
点１１ａを介して電源制御盤１の出力端子２ａに
接続されている。また、高周波電源９の他の出力
端９ｂは上記マグネツトスイツチのインターロツ
ク用接点１１ｂを介して、出力端子２ｂに接続さ
れている。この接点１１ａ，１１ｂは電源オンに
おいては、オフとなり高周波電源９、電流計１０
を保護するものである。なお、これらの構成要素
９，１０，１０ａ，１１ｂはいずれも電源制御盤
１に設けられている。 FIG. 2 is a diagram showing an embodiment of the present invention, and in the figure, parts corresponding to those in FIG. 9 is a high frequency power source, one end 9a of which is an ammeter 10, power on/off.
It is connected to the output terminal 2a of the power control panel 1 via the interlock contact 11a of the off magnetic switch. The other output end 9b of the high frequency power source 9 is connected to the output terminal 2b via the interlock contact 11b of the magnetic switch. These contacts 11a and 11b are turned off when the power is turned on, and the high frequency power supply 9 and ammeter 10
It protects the Note that these components 9, 10, 10a, and 11b are all provided in the power supply control panel 1.
第３図は、第２図に示す本実施例の等価回路図
である。図において、１２はケーブルの線間絶縁
抵抗で抵抗値Ｒ、１３はリフマグコイルでその抵
抗分が１３ａ（抵抗値R1）、インダクタンス分が
13b（インダクタンスＬ）である。また、７ａ，
７ｂはリフマグ７の端子台である。ここで、高周
波電源９の出力電圧の角周波数をω、実効値を
Ｅ、電流計１０を流れる電流の実効値をＩとすれ
ば
Ｉ＝｜１／Ｒ＋１／R1＋jωL｜・Ｅ ……(1)
が成立する。ここで絶縁抵抗値Ｒは、正常時には
非常に大きな値であり、一方コイル１３の抵抗値
R1は極めて小さな値である。また、角周波数ω
はケーブル３，５やコイル１３の浮遊容量などの
ためにある程度以上の値には決定できない。した
がつてインピーダンスωLは一般に絶縁抵抗値Ｒ
よりもかなり小さい値をとる。しかし、コイル１
３の抵抗値R1よりもはるかに大きい値をとるこ
とができるから、結局次式が成立する。 FIG. 3 is an equivalent circuit diagram of this embodiment shown in FIG. 2. In the figure, 12 is the insulation resistance between the lines of the cable, which has a resistance value R, 13 is a riffmag coil, and its resistance is 13a (resistance value R1), and the inductance is
13b (inductance L). Also, 7a,
7b is a terminal block of the riffmag 7. Here, if the angular frequency of the output voltage of the high frequency power supply 9 is ω, the effective value is E, and the effective value of the current flowing through the ammeter 10 is I, then I=|1/R+1/R 1 +jωL|・E ...( 1) holds true. Here, the insulation resistance value R is a very large value under normal conditions, while the resistance value of the coil 13
R1 is an extremely small value. Also, the angular frequency ω
cannot be determined to a value higher than a certain level due to the stray capacitance of the cables 3 and 5 and the coil 13. Therefore, impedance ωL is generally the insulation resistance value R
takes a value much smaller than . However, coil 1
Since the resistance value R of 3 can be much larger than 1 , the following equation holds true.
R1 1≪ωL≪Ｒ ……(2)
(2)式からR1≪ωLなので、(1)式のR1が省略できて
次式が成立する。
R 1 1 ≪ωL≪R ...(2) Since R 1 ≪ωL from equation (2), R 1 in equation (1) can be omitted and the following equation holds true.
ここでωL／Ｒ＝αとおいて(3)式を変形すると、
Ｉ＝１／ωL√１＋2・Ｅ…… (4)
が成立する。ところで、ケーブル３，５が正常の
ときには、(4)式からα≪１であるが、ケーブル
３，５に絶縁不良が発生し、例えばα＝0.5すな
わち、絶縁抵抗値ＲがインピーダンスωLの２倍
程度にまで減少したとすると、√１＋0.52≒1.12
であるから(4)式より電流Ｉは通常値より12％ほど
増加し、これによつてケーブル３，５の絶縁抵抗
の劣化を検出することができる。 Here, if we change equation (3) by setting ωL/R=α, then I=1/ωL√1+ 2 ·E... (4) holds true. By the way, when the cables 3 and 5 are normal, α≪1 from equation (4), but if an insulation failure occurs in the cables 3 and 5, for example α = 0.5, that is, the insulation resistance value R is twice the impedance ωL. If it decreases to about √1+0.5 2 ≒1.12
Therefore, according to equation (4), the current I increases by about 12% from the normal value, and from this, it is possible to detect the deterioration of the insulation resistance of the cables 3 and 5.
従つて検査のたびにケーブル５とリフマグ７を
切りはなすことなくケーブル３，５の絶縁検査を
行うことができる。また、リフマグコイル１３の
レアシヨートなどによりインダクタンスＬが減少
すると、(4)式より電流値Ｉが増加し、これも検出
することができる。 Therefore, the insulation of the cables 3 and 5 can be inspected without separating the cable 5 and the riffmag 7 each time the inspection is performed. Furthermore, when the inductance L decreases due to the rear shot of the refmag coil 13, the current value I increases according to equation (4), and this can also be detected.
なお、上記実施例では、電流検出手段として電
流計１０を用いたが、電流検出リレーを用いるこ
ともできる。 In addition, although the ammeter 10 was used as a current detection means in the said Example, a current detection relay can also be used.
また、上記実施例のように、高周波電源９、電
流計１０を電源制御盤１に収納せず、独立した装
置として構成し、携帯用とすることも可能であ
る。さらに、この発明はリフマグのみでなく、セ
パレーシヨンマグネツト（セパマグ）や他のイン
ダクタンス負荷の電流供給装置の絶縁不良検出方
法として適用することができる。 Further, as in the above embodiment, the high frequency power source 9 and the ammeter 10 are not housed in the power supply control panel 1, but can be configured as an independent device and made portable. Furthermore, the present invention can be applied not only to refmags but also as a method for detecting insulation defects in current supply devices for separation magnets (sepamags) and other inductance loads.
上述したように、この発明はケーブルの線間へ
高周波電源の出力を供給し、この時の高周波電源
の出力電流に基づいて絶縁不良を検出するように
したので、リフマグを取りはずすことなく絶縁不
良を検出することができる。また、その結果次の
ような利点が得られる。 As mentioned above, this invention supplies the output of a high-frequency power source between the lines of the cable, and detects an insulation defect based on the output current of the high-frequency power source at this time, so it is possible to detect an insulation defect without removing the refmag. can be detected. Moreover, as a result, the following advantages can be obtained.
リフマグを取りはずすのに要した作業人員と
時間とを減少させることができる。 It is possible to reduce the number of workers and time required to remove the riff mag.
絶縁不良検査が簡素化されたことにより、今
まで月一回程度であつた検査を毎日でも実施す
ることができ、クレーン作業の安全度を高める
ことができる。 By simplifying the insulation defect inspection, inspections that used to be carried out once a month can now be carried out every day, increasing the safety level of crane work.
リフマグコイルのレアシヨート等の異常も検
出でき、リフマグの信頼度を高くすることがき
る。 It is also possible to detect abnormalities such as the rare shoot of the rifmag coil, increasing the reliability of the rifmag.
第１図はリフマグの電流供給装置の構成を示す
図、第２図は本発明による絶縁不良検出方法を適
用したリフマグの電流供給装置の構成を示す図、
第３図はその等価回路である。
３，５……ケーブル、７……リフマグ（インダ
クタンス負荷）、９……高周波電源、１０……電
流計（電流検出手段）。
FIG. 1 is a diagram showing the configuration of a current supply device for a RIFF MAG, and FIG. 2 is a diagram showing a configuration of a current supply device for a RIFF MAG to which the insulation defect detection method according to the present invention is applied.
FIG. 3 shows its equivalent circuit. 3, 5...Cable, 7...Rifmag (inductance load), 9...High frequency power supply, 10...Ammeter (current detection means).
Claims (1)
ルの絶縁不良を検出する絶縁不良検出方法におい
て、前記インダクタンス負荷を取り外すことな
く、前記ケーブルの線間へ高周波電源の出力を供
給し、前記高周波電源の出力電流に基づいて、絶
縁不良を検出することを特徴とする絶縁不良検出
方法。1. In an insulation failure detection method for detecting insulation failure of a cable that supplies current to an inductance load, the output of a high frequency power source is supplied between the lines of the cable without removing the inductance load, and the output current of the high frequency power source is An insulation defect detection method characterized in that an insulation defect is detected based on the method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57083735A JPS58200172A (en) | 1982-05-18 | 1982-05-18 | Detection of insulation defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57083735A JPS58200172A (en) | 1982-05-18 | 1982-05-18 | Detection of insulation defect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58200172A JPS58200172A (en) | 1983-11-21 |
| JPH0316625B2 true JPH0316625B2 (en) | 1991-03-06 |
Family
ID=13810779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57083735A Granted JPS58200172A (en) | 1982-05-18 | 1982-05-18 | Detection of insulation defect |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58200172A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013177230A (en) * | 2012-02-28 | 2013-09-09 | Tadano Ltd | Load detecting device of crane |
| JP6578753B2 (en) * | 2015-06-15 | 2019-09-25 | コベルコ建機株式会社 | Magnet work machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5522684U (en) * | 1978-08-02 | 1980-02-14 | ||
| JPS584309B2 (en) * | 1978-10-30 | 1983-01-25 | 東京電力株式会社 | Transformer winding short circuit detection method |
-
1982
- 1982-05-18 JP JP57083735A patent/JPS58200172A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58200172A (en) | 1983-11-21 |
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