JP2613435B2 - Partial discharge measurement method - Google Patents
Partial discharge measurement methodInfo
- Publication number
- JP2613435B2 JP2613435B2 JP63128007A JP12800788A JP2613435B2 JP 2613435 B2 JP2613435 B2 JP 2613435B2 JP 63128007 A JP63128007 A JP 63128007A JP 12800788 A JP12800788 A JP 12800788A JP 2613435 B2 JP2613435 B2 JP 2613435B2
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- power
- detection coil
- phase
- phase power
- 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 - Fee Related
Links
Landscapes
- Testing Relating To Insulation (AREA)
- Protection Of Static Devices (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、分布定数系と見倣される電力ケーブルや発
電機コイルの部分放電を測定するための部分放電測定方
法に関するものである。Description: TECHNICAL FIELD The present invention relates to a partial discharge measuring method for measuring a partial discharge of a power cable or a generator coil which is regarded as a distributed constant system.
［従来の技術］ 部分放電測定方法には、使用する増幅帯域の相違によ
って広帯域、中帯域、狭帯域を用いる３つの方式があ
り、それぞれ広帯域を使用するものは広帯域法、中帯域
を使用するものは低周波法、狭帯域を使用するものは同
調法と呼ばれている。[Prior Art] There are three types of partial discharge measurement methods using a wide band, a medium band, and a narrow band depending on the difference of an amplification band to be used, and a method using a wide band and a method using a medium band, respectively, are used. Is called the low frequency method, and the method using the narrow band is called the tuning method.
従来では部分放電の測定は、測定対象となる電力供試
体の使用を停止して、通常の電源から切り離し、新たに
試験用電源装置と測定器を電力供試体に接続することに
よって行われている。例えば、三相電力ケーブルの部分
放電を測定する場合には、電源から電力ケーブルへの送
電を停止し、試験用電源と測定器を接続して、試験用電
源から電力ケーブルに試験電圧を印加させる。従って、
発電所や大工場のように電力ケーブルが多数布設されて
いる場所では、測定個所も多数になるため、装置の設置
等の測定作業に長時間かつ多数の要員が必要となる。ま
た、測定が長時間に渡れば、その間では電力ケーブルに
よる所定供給先への送電が行えず、二次的な影響が生ず
るという問題点もある。Conventionally, the measurement of partial discharge is performed by stopping use of the power test object to be measured, disconnecting the power supply from a normal power supply, and newly connecting a test power supply device and a measuring instrument to the power test sample. . For example, when measuring the partial discharge of a three-phase power cable, the power transmission from the power supply to the power cable is stopped, the test power supply is connected to the measuring instrument, and the test voltage is applied to the power cable from the test power supply. . Therefore,
In a place where a large number of power cables are laid, such as a power plant or a large factory, the number of measurement points is large, and a long time and a large number of personnel are required for measurement work such as installation of the device. In addition, when the measurement is performed for a long time, power cannot be transmitted to a predetermined supply destination by the power cable during that time, and there is a problem that a secondary effect occurs.
［発明の目的］ 本発明の目的は、電力ケーブルなどの三相電力供試体
への送電を行いながら、部分放電を正確かつ安定に計測
することが可能な部分放電測定方法を提供することにあ
る。[Object of the Invention] An object of the present invention is to provide a partial discharge measurement method capable of accurately and stably measuring a partial discharge while transmitting power to a three-phase power specimen such as a power cable. .
［発明の概要］ 上述の目的を達成するための本発明の要旨は、三相電
力供試体の各遮蔽層を接地線を介して接地し、前記三相
電力供試体及び前記接地線を囲むように検知コイルを配
置し、前記三相電力供試体に三相電圧を印加して部分放
電を発生させ、前記接地線に流れるパルス電流の前記検
知コイルによる測定値から、前記三相電力供試体の部分
放電を測定することを特徴とする部分放電測定方法であ
る。[Summary of the Invention] The gist of the present invention to achieve the above object is to ground each shielding layer of a three-phase power test object via a ground wire so as to surround the three-phase power test object and the ground wire. A three-phase voltage is applied to the three-phase power specimen to generate a partial discharge, and a pulse current flowing through the grounding wire is measured by the detection coil to determine the three-phase power specimen. This is a partial discharge measurement method characterized by measuring a partial discharge.
［発明の実施例］ 本発明を図示の実施例に基づいて詳細に説明する。[Embodiment of the Invention] The present invention will be described in detail based on the illustrated embodiment.
第１図は三相電力ケーブルに対して本発明の方法を実
施するための構成図であり、３本の三相電力ケーブルC
a、Cb、Ccの導体は、それぞれトランスTa、Tb、Tcの二
次コイルを介して中性点Ｎで接地し、トランスTa、Tb、
Tcの一次コイルはそれぞれ一端を接地し、他端を50Hz又
は60Hzの三相供給電源１に接続する。また、３本の電力
ケーブルCa、Cb、Ccの遮蔽層はそれぞれ接地線Ｇを介し
て接地し、３本の電力ケーブルCa、Cb、Cc及び接地線Ｇ
を巻回するように検知コイル２を配置し、この検知コイ
ル２の出力を部分放電測定器３に接続する。FIG. 1 is a block diagram for implementing the method of the present invention on a three-phase power cable.
The conductors a, Cb, and Cc are grounded at the neutral point N via the secondary coils of the transformers Ta, Tb, and Tc, respectively.
One end of each of the primary coils of Tc is grounded, and the other end is connected to a three-phase power supply 1 of 50 Hz or 60 Hz. Further, the shielding layers of the three power cables Ca, Cb, Cc are grounded via the ground lines G, respectively, and the three power cables Ca, Cb, Cc and the ground line G are connected.
Is wound, and the output of the detection coil 2 is connected to the partial discharge measuring device 3.
このように構成された装置において、三相供給電源１
から電力ケーブルCa、Cb、CcにトランスTa、Tb、Tcを介
して三相供給電源１から50Hz又は60Hzの三相交流電力を
供給する。そして、検知コイル２は３本の電力ケーブル
Ca、Cb、Ccと接地線Ｇに流れるそれぞれの電流により生
ずる磁束変化の合計を、電磁誘導により電圧に変換す
る。In the device configured as described above, the three-phase power supply 1
Supplies three-phase AC power of 50 Hz or 60 Hz from the three-phase power supply 1 to the power cables Ca, Cb, and Cc via the transformers Ta, Tb, and Tc. And the detection coil 2 has three power cables
The sum of the magnetic flux changes caused by the respective currents flowing through Ca, Cb, Cc and the ground line G is converted into a voltage by electromagnetic induction.
このように構成された装置においては、３本の電力ケ
ーブルCa、Cb、Ccに流れる三相電流により検知コイル２
上に発生する磁束変化の合計は、中性点Ｎが接地されて
いるため常に零である。３本の電力ケーブルCa、Cb、Cc
の何れにもボイド等が原因で部分放電が発生していない
場合には、電力ケーブルCa、Cb、Ccの遮蔽層にパルス電
流が流れないため、接地線Ｇにもパルス電流は流れず、
検知コイル２にパルス電圧が電磁誘導されることはな
い。In the device configured as described above, the detection coil 2 is driven by three-phase currents flowing through the three power cables Ca, Cb, and Cc.
The total change in magnetic flux generated above is always zero because the neutral point N is grounded. 3 power cables Ca, Cb, Cc
If no partial discharge occurs due to voids or the like in any of the above, no pulse current flows through the shielding layer of the power cables Ca, Cb, and Cc, so that no pulse current flows through the ground line G,
No pulse voltage is electromagnetically induced in the detection coil 2.
次に、電力ケーブルCa、Cb、Ccの何れかにボイドが原
因で部分放電が発生すると、部分放電の起きた電力ケー
ブルの遮蔽層にパルス電流が流れ、接地線Ｇを介して接
地点に流れ込む。このパルス電流は検知コイル２を通過
するため、電磁誘導によって検知コイル２にパルス電圧
が発生し、部分放電測定器３により検出される。そし
て、単位時間当りの放電パルス数や放電電荷量から電力
ケーブルCa、Cb、Ccの絶縁劣化の程度を計測することが
できる。Next, when a partial discharge occurs due to a void in any of the power cables Ca, Cb, and Cc, a pulse current flows in the shielding layer of the power cable in which the partial discharge has occurred, and flows into the ground via the ground line G. . Since this pulse current passes through the detection coil 2, a pulse voltage is generated in the detection coil 2 by electromagnetic induction, and is detected by the partial discharge measuring device 3. Then, the degree of insulation deterioration of the power cables Ca, Cb, and Cc can be measured from the number of discharge pulses and the amount of discharge charge per unit time.
また、外部から電力ケーブルCa、Cb、Ccにパルス性雑
音が加わった場合に、電力ケーブルCa、Cb、Ccの導体と
遮蔽層には同等のパルス電流が誘起されるが、導体に流
れるパルス電流はトランスTa、Tb、Tc側から流れ、遮蔽
層に流れるパルス電流は反対方向に流れるため、これら
のパルス電流による検知コイル２上での磁束変化は零と
なり雑音の影響を受けることはない。When pulse noise is applied to the power cables Ca, Cb, and Cc from the outside, equivalent pulse currents are induced in the conductors and the shielding layers of the power cables Ca, Cb, and Cc. Flows from the sides of the transformers Ta, Tb, and Tc, and the pulse current flowing in the shielding layer flows in the opposite direction. Therefore, the change in magnetic flux on the detection coil 2 due to these pulse currents becomes zero, and is not affected by noise.
更に、この実施例において電力ケーブルCa、Cb、Ccの
遮蔽層が接続点で接地されていても、接続点の遮蔽層か
ら接地点に流れ出す部分放電によるパルス電流は、検知
コイル２をトランスTa、Tb、Tc側から１回だけ通過する
ことになるので、検知コイル２に誘導されるパルス電圧
の強度は小さくならない。Furthermore, in this embodiment, even if the shield layers of the power cables Ca, Cb, and Cc are grounded at the connection point, the pulse current due to the partial discharge flowing from the shield layer at the connection point to the ground point causes the detection coil 2 to pass through the transformer Ta, Since the pulse passes only once from the Tb and Tc sides, the intensity of the pulse voltage induced in the detection coil 2 does not decrease.
なお、実施例では三相電力供試体として三相電力ケー
ブルを例に説明したが、三相電力供試体は例えば発電機
コイルであってもよいし、トランスTa、Tb、Tcを発電機
コイルに置き換え、全体として部分放電を測定すること
もできる。In the embodiment, a three-phase power cable has been described as an example of the three-phase power specimen, but the three-phase power specimen may be, for example, a generator coil, or the transformers Ta, Tb, and Tc may be used as the generator coils. Alternatively, partial discharge can be measured as a whole.
［発明の効果］ 以上説明したように本発明に係る部分放電測定方法
は、三相電力供試体の各遮蔽層を接地線を介して接地
し、三相電極供試体及び接地線を囲むように検知コイル
を配置することにより、三相電圧を印加した状態で供試
体の部分放電を測定することが可能なので、活線状況下
で測定が実施でき、測定作業の簡略化や測定時間の短縮
化が可能である。また、測定中も電力供試体への送電が
可能なので、二次的な影響が生ずる虞れもない。[Effects of the Invention] As described above, the partial discharge measurement method according to the present invention is configured such that each shielding layer of the three-phase power specimen is grounded via the grounding wire, and surrounds the three-phase electrode specimen and the grounding wire. By arranging the detection coil, it is possible to measure the partial discharge of the specimen with the three-phase voltage applied, so that the measurement can be performed under hot wire conditions, simplifying the measurement work and shortening the measurement time. Is possible. In addition, since power can be transmitted to the power specimen during the measurement, there is no possibility that a secondary influence will occur.
図面第１図は本発明に係る部分放電測定方法の実施例の
構成図である。 符号１は供給電源、２は検知コイル、３は部分放電測定
器である。FIG. 1 is a configuration diagram of an embodiment of a partial discharge measuring method according to the present invention. Reference numeral 1 denotes a power supply, 2 denotes a detection coil, and 3 denotes a partial discharge measuring device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 美納 智次 埼玉県熊谷市新堀1008番地 三菱電線工 業株式会社熊谷製作所内 (56)参考文献 特開 昭58−5677（ＪＰ，Ａ) 特開 昭51−10338（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoji Mino 1008 Shinbori, Kumagaya-shi, Saitama Mitsubishi Cable Industry Co., Ltd. Kumagaya Works (56) References JP-A-58-5677 (JP, A) JP-A Sho 51-10338 (JP, A)
Claims (1)
て接地し、前記三相電力供試体及び前記接地線を囲むよ
うに検知コイルを配置し、前記三相電力供試体に三相電
圧を印加して部分放電を発生させ、前記接地線に流れる
パルス電流の前記検知コイルによる測定値から、前記三
相電力供試体の部分放電を測定することを特徴とする部
分放電測定方法。1. A three-phase power specimen, wherein each shield layer is grounded via a ground wire, and a detection coil is arranged so as to surround the three-phase power specimen and the ground wire. A partial discharge measurement method comprising: applying a three-phase voltage to generate a partial discharge; and measuring a partial discharge of the three-phase power test sample from a measured value of a pulse current flowing through the ground line by the detection coil. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63128007A JP2613435B2 (en) | 1988-05-25 | 1988-05-25 | Partial discharge measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63128007A JP2613435B2 (en) | 1988-05-25 | 1988-05-25 | Partial discharge measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01297568A JPH01297568A (en) | 1989-11-30 |
| JP2613435B2 true JP2613435B2 (en) | 1997-05-28 |
Family
ID=14974167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63128007A Expired - Fee Related JP2613435B2 (en) | 1988-05-25 | 1988-05-25 | Partial discharge measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2613435B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4492298B2 (en) * | 2004-11-01 | 2010-06-30 | パナソニック株式会社 | Spark detection circuit for electric dust collector |
| JP6210606B2 (en) * | 2014-03-20 | 2017-10-11 | 公立大学法人大阪市立大学 | Electric power sensor system, regenerative electric power detection device, and electric motor system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5723227B2 (en) * | 1974-07-05 | 1982-05-18 | ||
| JPS585677A (en) * | 1981-07-01 | 1983-01-13 | Showa Electric Wire & Cable Co Ltd | Detecting method for partial discharge of power cable |
-
1988
- 1988-05-25 JP JP63128007A patent/JP2613435B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01297568A (en) | 1989-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |