JPH032268B2 - - Google Patents
Info
- Publication number
- JPH032268B2 JPH032268B2 JP57215212A JP21521282A JPH032268B2 JP H032268 B2 JPH032268 B2 JP H032268B2 JP 57215212 A JP57215212 A JP 57215212A JP 21521282 A JP21521282 A JP 21521282A JP H032268 B2 JPH032268 B2 JP H032268B2
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- gas
- gases
- cable
- cable system
- 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
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/221—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for cables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Description
【発明の詳細な説明】
本発明は、架橋ポリエチレン絶縁電力ケーブル
（以下「XLPEケーブル」と言う。）系統における
部分放電検出法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a partial discharge detection method in a cross-linked polyethylene insulated power cable (hereinafter referred to as "XLPE cable") system.
電力ケーブル系統における破壊事故は、即、送
電停止に繋がり、従つて、この事故が一度発生す
ると大きな社会的損害を被り兼ねない。 A destructive accident in a power cable system immediately leads to a power outage, and therefore, once this accident occurs, it can cause great social damage.
従つて、上記事故は、これを事前に発見し、そ
の対策を講じてこれを未然に防止することが極め
て重要となる。しかし、従来、電力ケーブル系統
における破壊事故発生の検出あるいはその位置の
測定と云つた内容の提案は数多く出されているも
のの、上記事故を事前に検知すると云つた提案と
なるとあまりない。 Therefore, it is extremely important to discover the above-mentioned accidents in advance and take countermeasures to prevent them from occurring. However, although many proposals have been made to detect the occurrence of destructive accidents in power cable systems or to measure their positions, there have been few proposals for detecting such accidents in advance.
ところで、通常電力ケーブルは、当初、その絶
縁層の電気的弱点箇所を起点として部分放電が起
こり、この部分放電により絶縁層が浸食を受け
て、最後に絶縁破壊へと至らしめられることは知
るところである。 By the way, it is well known that in normal power cables, partial discharge initially occurs at electrical weak points in the insulating layer, and this partial discharge causes the insulating layer to erode, eventually leading to dielectric breakdown. be.
そこで、本発明者らは、電力ケーブルにおける
部分放電発生の事実を早期に検知出来れば、電力
ケーブルの破壊事故を事前に発見できると云う点
に鑑み、鋭意研究に努めた結果、電力ケーブルの
部分放電時には或る特定のガスが発生しているこ
とを突き止めた。即ち、空気、窒素ガス（N2）、
六弗化硫黄ガス（SF6）等のガス体を充填した
XLPEケーブル系統において部分放電が生じると
CH4，C2H4等の炭化水素ガスが発生するが、絶
縁層中あるいは上記ガス体中に微量に含まれる酸
素あるいは水分と反応して水素ガス（H2）、一酸
化炭素ガス（CO）、二酸化炭素ガス（CO2）も比
較的多く発生するのである。 Therefore, the inventors of the present invention have conducted extensive research and found that if the fact that a partial discharge occurs in a power cable can be detected early, it is possible to discover a power cable destruction accident in advance. It was discovered that a certain gas is generated during discharge. That is, air, nitrogen gas (N 2 ),
Filled with gas such as sulfur hexafluoride gas (SF 6 )
Partial discharge occurs in XLPE cable system
Hydrocarbon gases such as CH 4 and C 2 H 4 are generated, but when they react with trace amounts of oxygen or moisture contained in the insulating layer or the gas body, hydrogen gas (H 2 ) and carbon monoxide gas (CO ) and carbon dioxide gas (CO 2 ) are also generated in relatively large amounts.
本発明は以上の知見に基づいて為されたもので
ある。 The present invention has been made based on the above findings.
本発明の目的は、XLPEケーブル系統における
部分放電を早期に検知できる方法を提供すること
にある。 An object of the present invention is to provide a method for early detection of partial discharge in an XLPE cable system.
すなわち、本発明の要旨は、シース内に空気、
N2，SF6等のガス体が充填してある状態下で架橋
ポリエチレン絶縁層中の部分放電時に発生する分
解生成ガスの中からH2，CO，CO2の一つもしく
は二つ以上を注出し、これらのガスの有無により
ケーブル系統における部分放電の発生の有無を検
出することを特徴とするXLPEケーブル系統にお
ける部分放電検出法にある。 That is, the gist of the present invention is that air inside the sheath,
One or more of H 2 , CO, and CO 2 is injected from among the decomposition gases generated during partial discharge in the crosslinked polyethylene insulation layer under a state filled with gases such as N 2 and SF 6 . The present invention provides a method for detecting partial discharge in an XLPE cable system, which is characterized by detecting the presence or absence of partial discharge in the cable system based on the presence or absence of these gases.
H2，CO，CO2の抽出は、ガスクロマトグラフ
イーにより行なう。 Extraction of H 2 , CO, and CO 2 is performed by gas chromatography.
なお、CO，CO2が酸素の不足により生じにく
い場合には、充填するガス中に少量（例えば１％
程度）の酸素を混入しておくと良い。 In addition, if CO and CO 2 are difficult to generate due to lack of oxygen, add a small amount (for example, 1%) to the gas to be filled.
It is best to mix in some amount of oxygen.
次に添付図面の第１図を参照しながら本発明の
一実施例を説明する。 Next, an embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.
第１図は、22KvXLPEケーブルを用いた部分
放電試験用サンプルであつて、１はケーブル導
体、２は内部遮蔽層、３は架橋ポリエチレン絶縁
層、４は幅15mmの半導電性テープを５mmのバツト
ギヤツプ４′を設けて巻いてなる静電遮蔽体、５
は錫メツキ銅線で、これは接地されている。６は
綿テープ巻き層、７は金属シースである。 Figure 1 shows a partial discharge test sample using a 22KvXLPE cable, where 1 is the cable conductor, 2 is the internal shielding layer, 3 is the crosslinked polyethylene insulation layer, and 4 is a 15mm wide semiconductive tape with a 5mm butt gap. 4', an electrostatic shield formed by winding, 5
is a tinned copper wire, which is grounded. 6 is a cotton tape wrapping layer, and 7 is a metal sheath.
以上のケーブルの内部を真空脱気した後で金属
シース７内側の空隙８にN2を充填し、この状態
でケーブルに対地電圧を22／√３Kvで50Hzの電
圧を１箇月間加えたところ、静電遮蔽体４のバツ
トギヤツプ部４′において微小な部分放電が生じ
た。そこで、上記ケーブル端部より空隙８中のガ
スを採取して、これを活性炭カラムを用いたガス
クロマトグラフイーにより分析した。その結果が
第２図である。第２図からも分かる通り、窒素ガ
ス雰囲気中での架橋ポリエチレン絶縁層３におけ
る部分放電により発生した炭化水素系ガスが、
N2あるいはケーブルコア内の微量残留酸素と結
合してCO，CO2が、また架橋ポリエチレンの分
解によりH2がかなり多量に発生している。この
他にCH4，C2H4，C2H6等の炭化水素系ガスが発
生しているが、前者に比べると検出値はわずかで
あり、ガス分析により部分放電の発生を知るには
前者のH2，CO，CO2の三種のガスの発生を知る
のが最も良いことは一目瞭然である。 After the inside of the cable was vacuum degassed, the gap 8 inside the metal sheath 7 was filled with N2 , and in this state, a ground voltage of 22/√3Kv and 50Hz was applied to the cable for one month. A minute partial discharge occurred at the butt gap 4' of the electrostatic shield 4. Therefore, the gas in the gap 8 was sampled from the end of the cable and analyzed by gas chromatography using an activated carbon column. The result is shown in Figure 2. As can be seen from Fig. 2, hydrocarbon gas generated by partial discharge in the crosslinked polyethylene insulating layer 3 in a nitrogen gas atmosphere,
CO and CO 2 are generated by combining with N 2 or a small amount of residual oxygen in the cable core, and a considerable amount of H 2 is generated due to the decomposition of cross-linked polyethylene. In addition, hydrocarbon gases such as CH 4 , C 2 H 4 , and C 2 H 6 are generated, but the detected values are small compared to the former, and it is difficult to determine the occurrence of partial discharge by gas analysis. It is obvious that it is best to understand the generation of the former three types of gases: H 2 , CO, and CO 2 .
以上説明した通り、本発明によればケーブルシ
ース内に発生した分解生成ガスの中から特にH2，
CO，CO2を抽出し、これらのガスの有無を見る
ことにより、架橋ポリエチレン絶縁層における部
分放電を高感度で検出でき、その結果、ケーブル
系統における破壊事故を事前に発見できる。ま
た、本発明によれば、ケーブル系統を運転中でも
随時検出可能であると共に、電気的な観点による
検出と異なり、外部雑音、誘導等の影響を受けず
安全に且つ安定した検出が可能である。 As explained above, according to the present invention, H 2 ,
By extracting CO and CO 2 and checking the presence or absence of these gases, partial discharges in cross-linked polyethylene insulation layers can be detected with high sensitivity, and as a result, breakdown accidents in cable systems can be detected in advance. Further, according to the present invention, detection can be performed at any time even while the cable system is in operation, and unlike detection from an electrical point of view, safe and stable detection is possible without being affected by external noise, induction, etc.
図は本発明部分放電検出法の一実施例説明図に
して、第１図は本発明部分放電検出を実施するに
当つて用いられるXLPEケーブルの断面図、第２
図は本発明部分放電検出法によつて検出した分解
生成ガス入り窒素ガスをガスクロマトグラフイー
により分析した結果を表わす図である。
１：ケーブル導体、２：内部遮蔽層、３：架橋
ポリエチレン絶縁層、４：静電遮蔽体、５：錫メ
ツキ銅線、６：綿テープ巻層、７：金属シース、
８：空隙、４′：バツトギヤツプ部。
The figures are explanatory diagrams of one embodiment of the partial discharge detection method of the present invention.
The figure shows the results of gas chromatography analysis of nitrogen gas containing decomposition product gas detected by the partial discharge detection method of the present invention. 1: Cable conductor, 2: Internal shielding layer, 3: Cross-linked polyethylene insulation layer, 4: Electrostatic shielding body, 5: Tin-plated copper wire, 6: Cotton tape wrapping layer, 7: Metal sheath,
8: air gap, 4': butt gap part.
Claims (1)
等のガス体が充填してある状態下で架橋ポリエチ
レン絶縁層中の部分放電時に発生する分解生成ガ
スの中から水素ガス、一酸化炭素ガス、二酸化炭
素ガスの一つもしくは二つ以上を抽出し、これら
のガスの有無によりケーブル系統における部分放
電の発生の有無を検出することを特徴とする架橋
ポリエチレン絶縁電力ケーブル系統における部分
放電検出法。1 Hydrogen gas and carbon monoxide gas are extracted from the decomposition gases generated during partial discharge in the crosslinked polyethylene insulation layer when the sheath is filled with gases such as air, nitrogen gas, and sulfur hexafluoride gas. , a method for detecting partial discharge in a cross-linked polyethylene insulated power cable system, characterized by extracting one or more of carbon dioxide gases and detecting the presence or absence of partial discharge in the cable system based on the presence or absence of these gases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21521282A JPS59105537A (en) | 1982-12-08 | 1982-12-08 | Detecting method for partial discharge in crosslinked- polyethylene insulated power cable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21521282A JPS59105537A (en) | 1982-12-08 | 1982-12-08 | Detecting method for partial discharge in crosslinked- polyethylene insulated power cable system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59105537A JPS59105537A (en) | 1984-06-18 |
| JPH032268B2 true JPH032268B2 (en) | 1991-01-14 |
Family
ID=16668548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21521282A Granted JPS59105537A (en) | 1982-12-08 | 1982-12-08 | Detecting method for partial discharge in crosslinked- polyethylene insulated power cable system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59105537A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101059485B (en) | 2007-05-23 | 2010-07-21 | 重庆大学 | Sulfur hexafluoride discharge decomposition gas component analysis system and its application method |
| CN104698298A (en) * | 2015-02-15 | 2015-06-10 | 宁波球冠电缆股份有限公司 | High-voltage DC cross-linked polyethylene insulating degassing effect detection method |
| CN106771857B (en) * | 2016-12-05 | 2023-05-12 | 广西电网有限责任公司柳州供电局 | Insulation defect characteristic gas detection system for crosslinked polyethylene power cable |
| CN110007201B (en) * | 2019-04-18 | 2020-05-22 | 国网湖北省电力有限公司电力科学研究院 | Device and method for fault detection of epoxy cast insulating tubular busbar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53149365A (en) * | 1977-06-01 | 1978-12-26 | Nichicon Capacitor Ltd | Insulation deterioration detector |
-
1982
- 1982-12-08 JP JP21521282A patent/JPS59105537A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59105537A (en) | 1984-06-18 |
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