JPS6148107B2 - - Google Patents
Info
- Publication number
- JPS6148107B2 JPS6148107B2 JP52080833A JP8083377A JPS6148107B2 JP S6148107 B2 JPS6148107 B2 JP S6148107B2 JP 52080833 A JP52080833 A JP 52080833A JP 8083377 A JP8083377 A JP 8083377A JP S6148107 B2 JPS6148107 B2 JP S6148107B2
- Authority
- JP
- Japan
- Prior art keywords
- electrical equipment
- ultraviolet
- discharge
- detector
- monitored
- 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
Links
- 230000005856 abnormality Effects 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 6
- 238000000825 ultraviolet detection Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 8
- 239000012212 insulator Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Description
本発明は、電気機器および電気設備等における
放電を伴う異常状態の発生を閃絡事故に至る前に
検出するための電気機器等の異常監視装置に関す
る。
電気機器等においては閃絡事故が発生すると、
大電流の事故電流が流れ、電気機器等が焼損す
る。このような閃絡事故から電気機器等を保護す
るため、従来は、電気機器等を流れる電流を監視
し、これが過大になると警報を発するようにして
いた。
しかし、このような電流によつて異常状態を監
視したのでは、閃絡事故が発生して大電流の事故
電流が流れた後でしか異常状態を検出することが
できないので、電気機器等を保護する上では十分
とはいえない。
本発明は、電気機器等を閃絡事故から完全に保
護するため、これらにおける絶縁劣化等による放
電を伴う異常状態の発生を閃絡事故に至る前に検
出し報知することもできる異常監視装置を得るこ
とを目的とするものである。
本発明は、紫外線検出器を設け、この検出器に
より電気機器等における監視対象部分で発生する
紫外線を監視することにより、前記目的を達成す
るものである。
一般に空気中で放電が出じると放電光が発生す
る。この放電光のスペクトラム強度分布は、空気
中に含まれるＮ、Ｏ、Ｈ等の原子、分子発光およ
びそれらの原子の組合せによる生成分子H2O、
H2O2、OH、NO、NO2等の分子発光および電気
機器等における放電回路中に含まれる構成部品の
成分Cu、Fe、Ｃ等の原子、分子発光が考えられ
る。それらの波長は、第１表に示す通りである。
The present invention relates to an abnormality monitoring device for electrical equipment, etc., for detecting the occurrence of an abnormal state accompanied by discharge in electrical equipment, electrical equipment, etc. before a flashover accident occurs. When a flashover accident occurs in electrical equipment, etc.,
A large fault current will flow and electrical equipment will burn out. In order to protect electrical equipment, etc. from such flash-flash accidents, conventionally, the current flowing through the electrical equipment, etc. has been monitored, and if this becomes excessive, an alarm is issued. However, if abnormal conditions are monitored using such current, abnormal conditions can only be detected after a flash fault has occurred and a large fault current has flowed, so it is difficult to protect electrical equipment, etc. It is not enough to do so. In order to completely protect electrical equipment, etc. from flash-flash accidents, the present invention provides an abnormality monitoring device that can detect and notify the occurrence of an abnormal state accompanied by discharge due to insulation deterioration etc. before a flash-flash accident occurs. The purpose is to obtain. The present invention achieves the above object by providing an ultraviolet detector and using the detector to monitor ultraviolet rays generated in a portion to be monitored in an electrical device or the like. Generally, when a discharge occurs in the air, discharge light is generated. The spectral intensity distribution of this discharge light is composed of atoms such as N, O, and H contained in the air, molecular emission, and molecules H 2 O generated by the combination of these atoms.
Possible examples include molecular luminescence such as H 2 O 2 , OH, NO, NO 2 and the like, and atomic and molecular luminescence such as Cu, Fe, and C, which are components of components contained in discharge circuits in electrical equipment and the like. Their wavelengths are shown in Table 1.
【表】
各放電光の発生は、放電々圧および放電々流等
に依存するところが大きいが第１表から明らかな
ようにどの放電光も広いハンド、スペクトラムを
なし、紫外線を多く含でいる。
したがつて、電気機器、電気設備においても絶
縁の劣化した部分で放電が発生すると紫外線が発
生される。本発明は、このような認識のもとにお
いて、電気機器等から発生する紫外線を紫外線検
出器により検出することにより沿面放電等の閃絡
に至る前の放電の発生を検出し、電気機器等にお
ける放電を伴う異常状態の発生を早期に検知する
ようにしたものである。
以下、本発明を図に示す実施例について説明す
る。
第１図は、本発明の実施例を示す概略構成図で
ある。この図において、１は監視対象である電線
２を支持するための碍子、３は紫外線検出管３
１、フード３２およびフイルタ３３からなる紫外
線検出器、４は信号出力回路、５は判定回路、６
は報知回路である。
電線２を支持する碍子１は、電線２により荷電
されるので、表面が汚損される等すると、その沿
面の絶縁耐力が低下し、沿面放電が発生し、点線
で示すように微小の放電々流が流れる。この放電
により紫外線が発生すると、紫外線検出器３がこ
れを検出し、信号出力回路４から検出信号を発生
し、判定回路５に与える。判定回路５は、検出信
号が所定レベルを越えたとき出力信号を発生し、
報知回路６を駆動する。
このような本発明によれば、碍子１において沿
面放電等が発生すると、これに伴なつて発生する
紫外線を検出して、碍子１の異常状態を報知する
ので、沿面放電が発展して閃絡に至る前に碍子１
の異常状態を検知し、報知することができる。
しかして、紫外線検出器３には、監視対象での
放電によつて発生する紫外線だけでなく、屋外で
は太陽光、大気放電光等の自然光に、そして屋内
では照明灯等の人工光に含まれる紫外線も作用す
る。このため、自然光、人工光等のいわゆる背景
光に含まれる紫外線の影響を除く手段を施さなけ
れば、検出誤りが発生する。
本発明においては、背景光の影響を除くため、
次のような手段をとることができる。
すなわち、紫外線を発生する照明灯としては、
水銀灯および螢光灯等が考えられるが、これはい
ずれも水銀（Hg）の原子発光によるもので、波
長が2537Åものに限られる。そして、大気中にお
ける大陽光のスペクトラム強度分布は、第２図に
示す通りであり、3200Åより長波長側に分布す
る。そこで、紫外線検出管として、スペクトラム
感度が2000〜3000Åものを使用し、そして、2537
Åの波長の紫外線を透過させずそれより長い波長
の紫外線を透過させるフイルタ３３を検出管の前
のにセツトするようにすれば、検出器３を背景光
に含まれる紫外線に無感応となるので、背景光に
よる検出誤りをなくすことができる。
また、大気放電、雷等によつて単発的に発生す
る背景紫外線の影響を除くためには、検出器３を
一定周期で動作させ判定回路において、所定時間
内の検出信号の個数を計数して、計数値が所定値
以上に達したときに出力信号を発生されるように
すれば、雷等によつて発生する持続時間の短い紫
外線を誤つて検出することはなくなる。この場
合、紫外線検出管の電源電圧として、監視対象の
電気機器等に印加された交流電圧と同じ周波数で
周期的に変化する電圧を用いれば、交流で使用す
る電気機器等における放電は、交流電圧の周波数
またはその２倍の周波数で周期的に発生するの
で、電源電圧の周期と検出信号の周期との相関を
とるかまたは、検出信号を電源周波数またはその
２倍の周波数の帯域漏波器を通して取出すように
することによつても単発的な背景光の影響は除く
ことができる。
なお、紫外線検出管３１は、一般に、紫外線量
の強さに比例した出力信号を発生するのではな
く、測定時間中に持続放電を起すに足る紫外線の
入射があつたか否を示す２値の出力信号を発生す
るので検出管３１を周期的に動作させ、判定回路
５にはデイジタル計数器またはアナログ積分器等
により時間的な平均値を求めて放電の発生を判定
する構成がとられる。また、紫外線検出器１は、
監視対象の電気機器等に１対１に対応して設けて
も、あるいは、配電盤のように複数の監視対象が
集中している場合はこれらを１つの検出器で監視
するようにしてもよい。
本発明は、電気設備の絶縁碍子をはじめとする
絶縁部の絶縁劣化をはじめ、しや断器の空気絶縁
破壊、直流機の整流子におけるブラシの接触不良
等の異常を検出するのに有効である。本発明は、
紫外線検出器により放電の発生を監視するように
しているので閃絡（フラシユオーバ）に至る前の
微小の放電々流を伴う沿面放電（コロナ放電）等
の発生も検出できる。したがつて、電流を監視す
る場合よりも早期に電気機器、電気設備等におけ
る絶縁劣化等の放電を伴う異常状態の発生を検知
できるので、電気機器等が閃絡により焼損される
のを未然に防止することができ、電気機器等を確
実に保護する上で大きな効果がある。[Table] The generation of each discharge light largely depends on the discharge voltage, discharge current, etc., but as is clear from Table 1, all the discharge lights have a wide spectrum and contain a large amount of ultraviolet rays. Therefore, even in electrical equipment and equipment, ultraviolet rays are generated when discharge occurs in areas where the insulation has deteriorated. Based on this recognition, the present invention detects the occurrence of discharge before flashing, such as creeping discharge, by detecting ultraviolet rays emitted from electrical equipment, etc. using an ultraviolet detector, and This system is designed to detect the occurrence of an abnormal state accompanied by discharge at an early stage. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. In this figure, 1 is an insulator for supporting the electric wire 2 to be monitored, and 3 is an ultraviolet detection tube 3.
1, an ultraviolet detector consisting of a hood 32 and a filter 33, 4 a signal output circuit, 5 a judgment circuit, 6
is the notification circuit. The insulator 1 that supports the electric wire 2 is charged by the electric wire 2, so if the surface is contaminated, the dielectric strength of the creeping surface will decrease, and a creeping discharge will occur, resulting in a minute discharge current as shown by the dotted line. flows. When ultraviolet light is generated by this discharge, the ultraviolet light detector 3 detects it, and the signal output circuit 4 generates a detection signal, which is applied to the determination circuit 5. The determination circuit 5 generates an output signal when the detection signal exceeds a predetermined level,
The notification circuit 6 is driven. According to the present invention, when a creeping discharge or the like occurs in the insulator 1, the ultraviolet rays generated along with this are detected and an abnormal state of the insulator 1 is notified, so that the creeping discharge develops and flash flashing occurs. Insulator 1 before reaching
It is possible to detect and notify abnormal conditions. Therefore, the ultraviolet detector 3 detects not only the ultraviolet rays generated by discharge in the monitored object, but also the ultraviolet rays contained in natural light such as sunlight and atmospheric discharge light outdoors, and in artificial light such as lighting lamps indoors. Ultraviolet light also works. Therefore, detection errors will occur unless measures are taken to eliminate the influence of ultraviolet rays contained in so-called background light such as natural light and artificial light. In the present invention, in order to eliminate the influence of background light,
The following measures can be taken: In other words, as a lighting lamp that generates ultraviolet rays,
Mercury lamps and fluorescent lamps are considered, but both are based on atomic emission of mercury (Hg) and are limited to wavelengths of 2537 Å. The spectral intensity distribution of the great sunlight in the atmosphere is as shown in Figure 2, and is distributed on the wavelength side longer than 3200 Å. Therefore, we used a UV detector tube with a spectrum sensitivity of 2000 to 3000 Å, and
By setting a filter 33 in front of the detection tube that does not transmit ultraviolet rays with a wavelength of 1.5 Å but allows ultraviolet rays with longer wavelengths to pass through, the detector 3 becomes insensitive to ultraviolet rays contained in the background light. , it is possible to eliminate detection errors due to background light. In addition, in order to eliminate the influence of background ultraviolet rays that occur sporadically due to atmospheric discharges, lightning, etc., the detector 3 is operated at a constant cycle and the judgment circuit counts the number of detection signals within a predetermined period of time. If the output signal is generated when the count value reaches a predetermined value or more, it is possible to avoid erroneously detecting short-duration ultraviolet rays generated by lightning or the like. In this case, if a voltage that periodically changes at the same frequency as the AC voltage applied to the electrical equipment to be monitored is used as the power supply voltage of the ultraviolet detection tube, the discharge in the electrical equipment that uses AC will be reduced to the AC voltage. Since this occurs periodically at the frequency of the power supply or twice its frequency, it is necessary to correlate the period of the power supply voltage with the period of the detection signal, or pass the detection signal through a band leaker at the frequency of the power supply or twice its frequency. The effect of isolated background light can also be removed by taking out the light. Note that the ultraviolet detection tube 31 generally does not generate an output signal proportional to the intensity of the amount of ultraviolet rays, but rather generates a binary output indicating whether or not enough ultraviolet rays have been incident to cause a sustained discharge during the measurement time. Since a signal is generated, the detection tube 31 is operated periodically, and the determination circuit 5 is configured to determine the occurrence of discharge by determining a temporal average value using a digital counter or an analog integrator. Moreover, the ultraviolet detector 1 is
The detectors may be provided in one-to-one correspondence with electrical equipment to be monitored, or if a plurality of objects to be monitored are concentrated, such as in a power distribution board, these may be monitored by one detector. The present invention is effective in detecting abnormalities such as insulation deterioration in insulating parts such as insulators in electrical equipment, air insulation breakdown in insulation breakers, and poor contact of brushes in commutators of DC machines. be. The present invention
Since the occurrence of discharge is monitored using an ultraviolet detector, it is also possible to detect the occurrence of creeping discharge (corona discharge) accompanied by minute discharge currents before flashover occurs. Therefore, it is possible to detect the occurrence of abnormal conditions accompanied by electrical discharge, such as deterioration of insulation, in electrical equipment and electrical equipment earlier than when monitoring current, so it is possible to prevent electrical equipment from being burnt out due to flash faults. This is highly effective in reliably protecting electrical equipment, etc.
第１図は本発明の実施例の概略構成図、第２図
は大陽光のスペクトル強度分布図である。
１：碍子、２：電線、３：紫外線検出器、４：
信号出力回路、５：判定回路、６：報知回路。
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 2 is a spectral intensity distribution diagram of great sunlight. 1: Insulator, 2: Electric wire, 3: Ultraviolet detector, 4:
Signal output circuit, 5: Judgment circuit, 6: Notification circuit.
Claims (1)
て2000〜3000Åの波長の紫外線に感応する紫外線
検出器を設け、この検出器により前記監視対象部
における放電の発生を監視するようにしたことを
特徴とする電気機器等の異常監視装置。 ２ 特許請求の範囲第１項記載の装置において、
紫外線検出器は、2000〜3000Åの波長の紫外線に
感応する紫外線検出管とフイルタとからなること
を特徴とする電気機器等の異常監視装置。 ３ 特許請求の範囲第２項記載の装置において、
フイルタは2537Åの波長の紫外線を透過させず、
それより長い波長の紫外線を透過させるものであ
ることを特徴とする電気機器等の異常監視装置。 ４ 特許請求の範囲第１項記載の装置において、
紫外線検出器は、監視対象の電気機器等に印加さ
れた交流電圧の周期に関連して動作させられるも
のであることを特徴とする電気機器等の異常監視
装置。[Scope of Claims] 1. An ultraviolet detector sensitive to ultraviolet light with a wavelength of 2000 to 3000 Å is provided facing a monitored part of electrical equipment, electrical equipment, etc., and this detector detects the occurrence of discharge in the monitored part. An abnormality monitoring device for electrical equipment, etc., characterized in that it is configured to monitor. 2. In the device according to claim 1,
An ultraviolet detector is an abnormality monitoring device for electrical equipment, etc., which consists of an ultraviolet detection tube and a filter that are sensitive to ultraviolet light with a wavelength of 2000 to 3000 Å. 3. In the device according to claim 2,
The filter does not transmit ultraviolet light with a wavelength of 2537 Å,
An abnormality monitoring device for electrical equipment, etc., characterized in that it transmits ultraviolet rays with longer wavelengths. 4. In the device according to claim 1,
An abnormality monitoring device for electrical equipment, etc., characterized in that the ultraviolet detector is operated in relation to the cycle of an alternating current voltage applied to the electrical equipment, etc. to be monitored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8083377A JPS5415149A (en) | 1977-07-06 | 1977-07-06 | Abnormality supervisory equipment for electric machinery and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8083377A JPS5415149A (en) | 1977-07-06 | 1977-07-06 | Abnormality supervisory equipment for electric machinery and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5415149A JPS5415149A (en) | 1979-02-03 |
| JPS6148107B2 true JPS6148107B2 (en) | 1986-10-22 |
Family
ID=13729392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8083377A Granted JPS5415149A (en) | 1977-07-06 | 1977-07-06 | Abnormality supervisory equipment for electric machinery and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5415149A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61174680U (en) * | 1985-04-19 | 1986-10-30 | ||
| JPS61243330A (en) * | 1985-04-20 | 1986-10-29 | Shikoku Electric Power Co Inc | Corona detector |
| JPH0627764B2 (en) * | 1986-05-21 | 1994-04-13 | 三菱電機株式会社 | Prediction method of external partial discharge and creepage flashover detection during withstanding voltage test of electrical equipment |
| JPH0265040U (en) * | 1988-10-28 | 1990-05-16 | ||
| JPH03197877A (en) * | 1989-12-26 | 1991-08-29 | Toshiba Corp | Partial discharge detecting device in electrical equipment |
| JP2007292489A (en) * | 2006-04-21 | 2007-11-08 | Toshiba Corp | Insulation abnormality diagnosis system of electric facilities |
| JP5022746B2 (en) * | 2007-03-19 | 2012-09-12 | 株式会社東芝 | Insulation abnormality diagnosis method and insulation abnormality diagnosis apparatus for electrical equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4832359U (en) * | 1971-08-19 | 1973-04-19 | ||
| JPS4946453A (en) * | 1972-09-05 | 1974-05-04 | ||
| JPS5242163A (en) * | 1975-09-30 | 1977-04-01 | Nissin Electric Co Ltd | Internal discharge detecting device for closed electric apparatus |
-
1977
- 1977-07-06 JP JP8083377A patent/JPS5415149A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4832359U (en) * | 1971-08-19 | 1973-04-19 | ||
| JPS4946453A (en) * | 1972-09-05 | 1974-05-04 | ||
| JPS5242163A (en) * | 1975-09-30 | 1977-04-01 | Nissin Electric Co Ltd | Internal discharge detecting device for closed electric apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5415149A (en) | 1979-02-03 |
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