JPH05203694A - Method for testing water-tree resistance of cable insulator - Google Patents
Method for testing water-tree resistance of cable insulatorInfo
- Publication number
- JPH05203694A JPH05203694A JP4010362A JP1036292A JPH05203694A JP H05203694 A JPH05203694 A JP H05203694A JP 4010362 A JP4010362 A JP 4010362A JP 1036292 A JP1036292 A JP 1036292A JP H05203694 A JPH05203694 A JP H05203694A
- Authority
- JP
- Japan
- Prior art keywords
- water
- sample
- tree
- peripheral surface
- cable
- 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.)
- Pending
Links
- 239000012212 insulator Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 title claims abstract description 7
- 240000005572 Syzygium cordatum Species 0.000 title abstract description 29
- 235000006650 Syzygium cordatum Nutrition 0.000 title abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 238000010998 test method Methods 0.000 claims description 8
- 238000011161 development Methods 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 abstract description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ケーブル絶縁体の耐水
トリー性を評価するための試験方法に関する。FIELD OF THE INVENTION This invention relates to a test method for evaluating the water resistance of cable insulation.
【０００２】[0002]
【従来の技術】架橋ポリエチレン絶縁ケーブルなどのケ
ーブルの絶縁体の耐水トリー性を評価するために、水ト
リーの発生から水トリーが進展していく過程を直接観察
できるような試験方法の要望がある。2. Description of the Related Art In order to evaluate the water-tree resistance of a cable insulator such as a cross-linked polyethylene insulated cable, there is a demand for a test method capable of directly observing the progress of the water tree from the generation of the water tree. ..
【０００３】従来、この種の試験方法としては、図５に
示すように、ケーブル絶縁体１からその外周面および内
周面の一部をそれぞれ含むようなブロック状の試料２を
切出し、この切出した試料２の前記外周面および内周面
に当該する面にそれぞれ、導電性塗料の塗布などにより
電極３、４を設け、これらの電極３、４間に、図６に示
すように、高電圧トランス５などにより所要の高電圧を
印加して、試料２におけるトリーの発生およびその進展
の様子を端面より観察する方法が知られている。 しか
しながら、この方法は、印加電圧が高くなると、雰囲気
中に露出した試料２の沿面にフラッシュオーバ現象を生
じ、電極３、４間に所定の電圧を印加することができな
くなるという問題があった。そもそも、水トリーの場合
には、水を共存させる必要があり、この水によって電極
３、４間が導通してしまうため、上記方法をそのまま水
トリーの試験に適用することは困難である。Conventionally, as a test method of this kind, as shown in FIG. 5, a block-shaped sample 2 including a part of the outer peripheral surface and a part of the inner peripheral surface thereof is cut out from a cable insulator 1, and this cutout is cut out. Electrodes 3 and 4 are provided on the surfaces corresponding to the outer peripheral surface and the inner peripheral surface of the sample 2 by applying a conductive paint, respectively, and a high voltage is applied between these electrodes 3 and 4, as shown in FIG. A method is known in which a required high voltage is applied by a transformer 5 or the like and the state of generation and development of trees in the sample 2 is observed from the end surface. However, this method has a problem that when the applied voltage becomes high, a flashover phenomenon occurs on the surface of the sample 2 exposed in the atmosphere, and it becomes impossible to apply a predetermined voltage between the electrodes 3 and 4. In the first place, in the case of a water tree, it is necessary to allow water to coexist, and this water causes electrical continuity between the electrodes 3 and 4. Therefore, it is difficult to directly apply the above method to the water tree test.
【０００４】[0004]
【発明が解決しようとする課題】このように、ケーブル
絶縁体の耐水トリー性を評価するために、水トリーの発
生および進展の様子を直接観察できる方法が要望されて
いるが、未だ確立された技術がないのが実状である。As described above, in order to evaluate the water-tree resistance of the cable insulator, a method for directly observing the generation and progress of the water tree has been demanded, but it has not been established yet. The reality is that there is no technology.
【０００５】本発明はこのような従来の事情に対処して
なされたもので、ケーブル絶縁体の水トリーの発生およ
び進展の様子を直接観察することができる方法であっ
て、ケーブル絶縁体試料に所要の高電圧を確実に印加す
ることができ、信頼性の高い耐水トリー性の評価を行う
ことができる耐水トリー性試験方法を提供することを目
的とする。The present invention has been made in consideration of such conventional circumstances, and is a method for directly observing the state of generation and development of a water tree in a cable insulator, and It is an object of the present invention to provide a water tree resistance test method capable of reliably applying a required high voltage and capable of highly reliable evaluation of water tree resistance.
【０００６】[0006]
【課題を解決するための手段】本願の第１の発明は、ケ
ーブル絶縁体をケーブル軸にほぼ垂直な平面で切断して
リング状の試料を作成し、このリング状試料の両切断面
にその少なくとも一方が透明な 2枚の絶縁板のそれぞれ
を当接させて前記試料中心に水密な中空部を形成すると
ともに、この中空部に水を入れ、前記試料の外周にも水
が存在するようにして、前記試料の内周面と外周面との
間に所要の電圧を印加することを特徴としている。According to a first aspect of the present invention, a ring-shaped sample is prepared by cutting a cable insulator along a plane substantially perpendicular to the cable axis, and the ring-shaped sample is cut on both cut surfaces. At least one of the two transparent insulating plates is brought into contact with each other to form a watertight hollow part in the center of the sample, and water is put in this hollow part so that water also exists on the outer periphery of the sample. Then, a required voltage is applied between the inner peripheral surface and the outer peripheral surface of the sample.
【０００７】また、本願の第２の発明は、ケーブル絶縁
体をケーブル軸にほぼ垂直な平面で切断してリング状の
絶縁体とし、さらに、このリング状の絶縁体を軸方向に
切断して円弧状の試料を作成し、この円弧状の試料の径
方向の両切断面に、その少なくとも一方が透明な 2枚の
絶縁板を当接させ、前記試料の内周面の少なくとも一部
を水と共存させるとともに、前記試料の外周面の少なく
とも一部も水と共存させ、これらの内周面と外周面との
間に所要の電圧を印加することを特徴としている。According to a second aspect of the present invention, the cable insulator is cut along a plane substantially perpendicular to the cable axis to form a ring-shaped insulator, and the ring-shaped insulator is further cut in the axial direction. Create an arc-shaped sample.Attach two insulating plates, at least one of which is transparent, to both radial cutting surfaces of the arc-shaped sample, and at least a part of the inner peripheral surface of the sample is wetted. And at least a part of the outer peripheral surface of the sample also coexist with water, and a required voltage is applied between the inner peripheral surface and the outer peripheral surface.
【０００８】[0008]
【作用】本発明方法においては、試料の沿面の全てもし
くは大部分が絶縁板で覆われ雰囲気に直接露出しない状
態で課電されるため、フラッシュオーバの発生が可及的
に少なくなり、また、試料沿面と絶縁板との界面に水が
侵入して試料の内周側と外周側が導通することもないの
で、ケーブル絶縁体試料に所要の高電圧を確実に印加す
ることができる。そして、このような電圧の印加によっ
て試料に水トリーが発生した場合に、その発生から進展
に至る様子を、透明な絶縁板を通して直接観察すること
ができる。In the method of the present invention, since all or most of the creeping surface of the sample is covered with the insulating plate and is not directly exposed to the atmosphere, the voltage is applied, so that the occurrence of flashover is reduced as much as possible. Since water does not enter the interface between the surface of the sample and the insulating plate and electrical continuity does not occur between the inner peripheral side and the outer peripheral side of the sample, the required high voltage can be reliably applied to the cable insulator sample. Then, when a water tree is generated in the sample by the application of such a voltage, it is possible to directly observe how the water tree is generated and progressed through the transparent insulating plate.
【０００９】したがって、ケーブル絶縁体試料の水トリ
ーの発生および進展の様子を直接観察しながら、信頼性
の高い耐水トリー性の評価を行うことができる。Therefore, it is possible to evaluate the water tree resistance with high reliability while directly observing the generation and development of the water tree of the cable insulator sample.
【００１０】[0010]
【実施例】以下、本発明の実施例を図面を用いて説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】まず、図１および図２に示す実施例につい
て説明する。First, the embodiment shown in FIGS. 1 and 2 will be described.
【００１２】この実施例においては、評価すべき、架橋
ポリエチレン絶縁ケーブルのようなケーブルの絶縁体
を、ケーブル軸にほぼ垂直な平面で切断してリング状の
試料６を作成する。In this example, a ring-shaped sample 6 is prepared by cutting an insulator of a cable to be evaluated, such as a cross-linked polyethylene insulated cable, in a plane substantially perpendicular to the cable axis.
【００１３】次いで、この試料６を、その両切断面側か
ら、アクリル板のような 2枚の透明絶縁板７の間に挟み
込み、透明絶縁板７の 4隅に配置した締付治具８によっ
て透明絶縁板７間を厚さ方向に締付けることによって、
透明絶縁板７間に試料６を固定させるとともに、各透明
絶縁板７を試料６の両切断面に密着させて試料６の中心
に水密な中空部９を形成する。なお、このとき、試料６
の切断面と透明絶縁板７との間にグリースのような封着
材を介在させるようにすれば、これらの界面の密着性が
向上し、後述する中空部９の水密性をより高めることが
できる。Next, the sample 6 is sandwiched between two transparent insulating plates 7 such as an acrylic plate from both sides of the cut surface, and the clamping jigs 8 arranged at the four corners of the transparent insulating plate 7 are used. By tightening the transparent insulating plates 7 in the thickness direction,
The sample 6 is fixed between the transparent insulating plates 7, and each transparent insulating plate 7 is brought into close contact with both cut surfaces of the sample 6 to form a watertight hollow portion 9 at the center of the sample 6. At this time, sample 6
If a sealing material such as grease is interposed between the cut surface of the transparent insulating plate 7 and the transparent insulating plate 7, the adhesiveness of these interfaces can be improved and the watertightness of the hollow portion 9 described later can be further enhanced. it can.
【００１４】続いて、中空部９に水を充填するが、この
充填は、予め透明絶縁板７の一方のほぼ中心、固定時に
中空部９上に位置する部分に穿設しておいた透孔（図示
なし）より行うことができる。このようにして中空部９
に水を充填した後、この透孔に、アクリル樹脂などから
なる絶縁パイプ１０を水密に挿着し、この絶縁パイプ１
０を通して、高電圧トランス１１から引き出された金属
リード線１２の先端を水で満たされた中空部９内に挿入
する。Subsequently, the hollow portion 9 is filled with water. This filling is performed by forming a through hole which has been previously formed in substantially the center of one side of the transparent insulating plate 7 and in a portion located on the hollow portion 9 when fixed. (Not shown). In this way, the hollow portion 9
After filling the inside with water, an insulating pipe 10 made of acrylic resin or the like is watertightly inserted into the through hole.
Through 0, the tip of the metal lead wire 12 pulled out from the high voltage transformer 11 is inserted into the hollow portion 9 filled with water.
【００１５】この後、これらを、図２に示すような水槽
１３内に、少なくとも絶縁パイプ１０の上端が水面より
突出し、かつ試料６全体が水中に沈むように浸漬保持す
るとともに、中空部９内の水と水槽１３内の水をそれぞ
れ電極として、高電圧トランス１１により、試料６の内
周面と外周面との間に所定の電圧を印加する。Thereafter, these are immersed and held in a water tank 13 as shown in FIG. 2 so that at least the upper end of the insulating pipe 10 projects from the water surface and the entire sample 6 is submerged in water, and the inside of the hollow portion 9 is kept. A predetermined voltage is applied between the inner peripheral surface and the outer peripheral surface of the sample 6 by the high voltage transformer 11 using water and water in the water tank 13 as electrodes.
【００１６】電圧の印加によって、試料６にはその特性
に応じて水トリーが発生、進展し、その様子を透明絶縁
板７を通して観察することにより、試料の耐水トリー性
を評価することができる。By applying a voltage, a water tree is generated and develops in the sample 6 according to its characteristics, and by observing the state through the transparent insulating plate 7, the water tree resistance of the sample can be evaluated.
【００１７】この実施例においては、試料６の電極間を
つなぐ沿面が透明絶縁板７により覆われ直接露出してい
ないので、フラッシュオーバを生じることがなく、ま
た、その試料沿面と絶縁板との界面に水が侵入して電極
間が導通することもないので、所要の電圧を確実に印加
することができる。そして、このような電圧の印加によ
って、試料中に発生し、進展する水トリーの様子を、透
明絶縁板７を通して直接かつ明瞭に観察することができ
るため、信頼性の高い耐水トリー性の評価を行うことが
できる。In this embodiment, since the creeping surface connecting the electrodes of the sample 6 is covered with the transparent insulating plate 7 and is not directly exposed, flashover does not occur, and the creeping surface of the sample and the insulating plate do not occur. Since water does not enter the interface and electrical continuity occurs between the electrodes, it is possible to reliably apply a required voltage. Then, by applying such a voltage, it is possible to directly and clearly observe the state of the water tree that is generated and developed in the sample through the transparent insulating plate 7, and therefore, it is possible to highly evaluate the water tree resistance. It can be carried out.
【００１８】次に、図３および図４に示す本発明の他の
実施例について説明する。Next, another embodiment of the present invention shown in FIGS. 3 and 4 will be described.
【００１９】図面に示すように、この実施例において、
試料１４を 2枚の透明絶縁板１５に挟持させ、これら 2
枚の透明絶縁板１５を試料１４の径方向切断面に密着さ
せる点では、上記実施例と同じであるが、この実施例で
は、上記リング状の試料６に代えて、それをさらに長さ
方向に切断するとともに、その内周側および外周側の周
面に導電性塗料を塗布するなどして予め電極部１６ａ、
１６ｂを形成した半リング状の試料１４を使用する。As shown in the drawings, in this embodiment,
The sample 14 is sandwiched between two transparent insulating plates 15,
This is the same as the above-described embodiment in that the transparent insulating plate 15 of one sheet is closely attached to the radial cut surface of the sample 14, but in this example, instead of the ring-shaped sample 6, it is further lengthwise. The electrode portion 16a is cut in advance by applying conductive paint to the inner and outer peripheral surfaces thereof,
A semi-ring sample 14 having 16b is used.
【００２０】また、透明絶縁板１５の周縁部は、封止板
１７によって封止し、さらに、透明絶縁板１５間の複数
箇所に、試料１４の厚さよりやや短尺でボルト挿通孔を
有するスペーサ１８を介挿させるとともに、透明絶縁板
１５間をボルト１９およびナット２０により両側から締
付けることにより、透明絶縁板１５と試料１４の径方向
の切断面との密着性を高める。なお、ボルト１９にはコ
イルばね２１が遊嵌されており、そのばね圧によって透
明絶縁板１５が付勢され、透明絶縁板１５と試料１４の
径方向の切断面とがより良好に密着する。The peripheral edge of the transparent insulating plate 15 is sealed by a sealing plate 17, and spacers 18 having bolt insertion holes, which are slightly shorter than the thickness of the sample 14, are formed at a plurality of positions between the transparent insulating plates 15. By interposing between the transparent insulating plates 15 and tightening the transparent insulating plates 15 from both sides with bolts 19 and nuts 20, the adhesion between the transparent insulating plates 15 and the radial cut surface of the sample 14 is improved. A coil spring 21 is loosely fitted to the bolt 19, and the transparent insulating plate 15 is biased by the spring pressure so that the transparent insulating plate 15 and the radial cut surface of the sample 14 are more closely attached.
【００２１】そして、水２２は、試料１４を挟持した透
明絶縁板１５を、図４に示すように壁面２３などに立て
掛けた後、試料１４の外周面の一部と、内周面の一部が
少なくともそれぞれ独立して水２２に触れるように充填
する。Then, after the transparent insulating plate 15 holding the sample 14 is leaned against the wall surface 23 or the like as shown in FIG. 4, a part of the outer peripheral surface of the sample 14 and a part of the inner peripheral surface of the water 22 are used. At least independently of each other so as to touch the water 22.
【００２２】この状態で、詳細は省略するが、図３に示
すように、上記実施例の場合と同様に、高電圧トランス
２４などにより、内周側電極１６ａと外周側電極１６ｂ
との間に所定の電圧を印加し、試料中に発生し、進展す
る水トリーの様子を、透明絶縁板１５を通して直接観察
することにより、信頼性の高い耐水トリー性評価を行う
ことができる。In this state, although not described in detail, as shown in FIG. 3, as in the case of the above embodiment, the inner electrode 16a and the outer electrode 16b are provided by the high voltage transformer 24 and the like.
By applying a predetermined voltage between the two, and directly observing the state of the water tree generated and developing in the sample through the transparent insulating plate 15, a highly reliable water tree resistance evaluation can be performed.
【００２３】なお、この実施例においては、試料１４を
挟んだ透明絶縁板１５を水中に浸漬する必要がないの
で、先に説明した実施例に比べて、水トリーを観察しや
すく、取扱いも容易である。In this embodiment, since it is not necessary to immerse the transparent insulating plate 15 sandwiching the sample 14 in water, the water tree is easier to observe and easier to handle than the previously described embodiments. Is.
【００２４】[0024]
【発明の効果】以上説明したように、本発明の試験方法
によれば、試料の沿面にフラッシュオーバや水の存在に
よる導通を可及的に少なくすることができるので、ケー
ブル絶縁体試料に対し所要の高電圧を確実に印加するこ
とができ、透明な絶縁板を通して、水トリーの発生およ
びその進展状態を直接観察しながら、信頼性の高い耐水
トリー性の評価を行うことができる。As described above, according to the test method of the present invention, it is possible to reduce flashover and conduction due to the presence of water on the surface of the sample as much as possible. A required high voltage can be reliably applied, and a highly reliable evaluation of water tree resistance can be performed while directly observing the generation and progress of water trees through a transparent insulating plate.
【図１】本発明の一実施例において、ケーブル絶縁体か
ら採取した試料を試験装置に装着した状態を示す斜視
図。FIG. 1 is a perspective view showing a state in which a sample taken from a cable insulator is mounted on a test apparatus in an embodiment of the present invention.
【図２】図１に示した試験装置を水に浸漬して、試料の
耐水トリー性を試験する方法を説明する図。FIG. 2 is a diagram for explaining a method for testing the water resistance of a sample by immersing the test apparatus shown in FIG. 1 in water.
【図３】本発明の他の実施例を説明する図。FIG. 3 is a diagram for explaining another embodiment of the present invention.
【図４】図３のIV−IV線断面図。4 is a sectional view taken along line IV-IV in FIG.
【図５】従来の耐トリー性試験方法において用いる試料
の採取方法を説明する斜視図。FIG. 5 is a perspective view illustrating a method of collecting a sample used in a conventional tree resistance test method.
【図６】従来の耐トリー性試験方法を説明する図。FIG. 6 is a diagram illustrating a conventional tree resistance test method.
６、１４………試料 ７、１５………透明絶縁板 ９………中空部 １１、２４………高電圧トランス １２………金属リード線 １３………水槽 １６ａ、１６ｂ………電極部 ２２………水 6, 14 ... Sample 7, 15 ... Transparent insulating plate 9 ... Hollow part 11, 24 ... High voltage transformer 12 ... Metal lead wire 13 ... Water tank 16a, 16b ... Electrode Part 22 ......... Water
Claims (2)
な平面で切断してリング状の試料とし、このリング状試
料の両切断面にその少なくとも一方が透明な2枚の絶縁
板を当接させて前記試料中心に水密な中空部を形成する
とともに、この中空部に水を入れ、前記試料の外周にも
水が存在するようにして、前記試料の内周面と外周面と
の間に所要の電圧を印加することを特徴とするケーブル
絶縁体の耐水トリー性試験方法。1. A cable-shaped insulator is cut along a plane substantially perpendicular to the cable axis to form a ring-shaped sample, and two insulating plates, at least one of which is transparent, are brought into contact with both cut surfaces of the ring-shaped sample. To form a watertight hollow portion in the center of the sample, and to put water in the hollow portion so that water also exists on the outer periphery of the sample, and the water is required between the inner peripheral surface and the outer peripheral surface of the sample. Test method for water resistance of cable insulators, which is characterized by applying the above voltage.
な平面で切断してリング状の絶縁体とし、さらに、この
リング状の絶縁体を軸方向に切断して円弧状の試料を作
成し、この円弧状の試料の径方向の両切断面に、その少
なくとも一方が透明な 2枚の絶縁板を当接させ、前記試
料の内周面の少なくとも一部を水と共存させるととも
に、前記試料の外周面の少なくとも一部も水と共存さ
せ、これらの内周面と外周面との間に所要の電圧を印加
することを特徴とするケーブル絶縁体の耐水トリー性試
験方法。2. A cable insulator is cut along a plane substantially perpendicular to the cable axis to form a ring-shaped insulator, and the ring-shaped insulator is cut in the axial direction to prepare an arc-shaped sample, At least one of the two insulating plates, at least one of which is transparent, is brought into contact with both radial cut surfaces of the arc-shaped sample so that at least a part of the inner peripheral surface of the sample coexists with water, and A method for testing water resistance of a cable insulator, wherein at least a part of the outer peripheral surface is made to coexist with water and a required voltage is applied between the inner peripheral surface and the outer peripheral surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4010362A JPH05203694A (en) | 1992-01-23 | 1992-01-23 | Method for testing water-tree resistance of cable insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4010362A JPH05203694A (en) | 1992-01-23 | 1992-01-23 | Method for testing water-tree resistance of cable insulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203694A true JPH05203694A (en) | 1993-08-10 |
Family
ID=11748055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4010362A Pending JPH05203694A (en) | 1992-01-23 | 1992-01-23 | Method for testing water-tree resistance of cable insulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977432A (en) * | 2014-04-11 | 2015-10-14 | 南方电网科学研究院有限责任公司 | Water spray apparatus for long-string insulator wet operation impact test, and application thereof |
| CN118011164A (en) * | 2024-04-10 | 2024-05-10 | 国网山西省电力公司运城供电公司 | Device and method for detecting water tree resistance of crosslinked polyethylene cable |
-
1992
- 1992-01-23 JP JP4010362A patent/JPH05203694A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977432A (en) * | 2014-04-11 | 2015-10-14 | 南方电网科学研究院有限责任公司 | Water spray apparatus for long-string insulator wet operation impact test, and application thereof |
| CN104977432B (en) * | 2014-04-11 | 2019-09-20 | 南方电网科学研究院有限责任公司 | Long-string insulator wet practice impact test water injector and its application |
| CN118011164A (en) * | 2024-04-10 | 2024-05-10 | 国网山西省电力公司运城供电公司 | Device and method for detecting water tree resistance of crosslinked polyethylene cable |
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