JP2681563B2 - Thermocouple mounting part on the surface of cable coating - Google Patents
Thermocouple mounting part on the surface of cable coatingInfo
- Publication number
- JP2681563B2 JP2681563B2 JP3313930A JP31393091A JP2681563B2 JP 2681563 B2 JP2681563 B2 JP 2681563B2 JP 3313930 A JP3313930 A JP 3313930A JP 31393091 A JP31393091 A JP 31393091A JP 2681563 B2 JP2681563 B2 JP 2681563B2
- Authority
- JP
- Japan
- Prior art keywords
- thermocouple
- cable
- layer
- conductor
- temperature
- 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
- 239000011248 coating agent Substances 0.000 title claims description 9
- 238000000576 coating method Methods 0.000 title claims description 9
- 239000004020 conductor Substances 0.000 claims description 49
- 239000011888 foil Substances 0.000 claims description 24
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 45
- 239000011247 coating layer Substances 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910001006 Constantan Inorganic materials 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Insulated Conductors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱電対を用いて電力ケー
ブルの表面温度や電力ケーブルの表面からの放散熱流を
測定する場合等におけるケーブル被覆表面の熱電対取付
部に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple mounting portion on a surface of a cable coating when a surface temperature of a power cable or a radiated heat flow from the surface of the power cable is measured by using a thermocouple.
【０００２】[0002]
【発明の背景】電力ケーブル線路の保守監視システムの
一環として電力ケーブル線路の導体温度を測定し、監視
することが望まれるが、高電圧が印加されている導体の
温度を直接測定することは困難である。そこで、本願の
発明者等は導体温度を正確かつ迅速に推定できる方法と
して、ケーブルの表面温度とケーブルの導体電流とから
導体温度を推定する電流法と、ケーブルの表面温度とケ
ーブル表面からの放散熱流とから導体温度を推定する熱
流法との二通りの方法を提案し、これらの方法により電
力ケーブル線路の導体温度を精度良く測定し、監視でき
ることを実験的にも確認した。その詳細は、例えば、電
気学会論文誌Ｂ電力・エネルギー部門誌、１１０巻７号
（平成２年７月）の第６０９頁以下の論文「地中電力ケ
ーブルの導体温度監視方法の検討」に述べられている。BACKGROUND OF THE INVENTION It is desirable to measure and monitor the conductor temperature of a power cable line as part of a power cable line maintenance monitoring system, but it is difficult to directly measure the temperature of a conductor to which a high voltage is applied. Is. Therefore, the inventors of the present application, as a method of accurately and quickly estimating the conductor temperature, use a current method that estimates the conductor temperature from the surface temperature of the cable and the conductor current of the cable, and a surface temperature of the cable and dissipation from the cable surface. We proposed two methods, the heat flow method and the heat flow method to estimate the conductor temperature from the heat flow, and confirmed experimentally that the conductor temperature of the power cable line can be accurately measured and monitored by these methods. The details are described in, for example, the paper "Study of conductor temperature monitoring method for underground power cables" on pages 609 and below of the Institute of Electrical Engineers of Japan, Journal of Power and Energy, Vol. 110, No. 7, July, 1990. Has been.
【０００３】上記の方法により電力ケーブルの導体温度
を測定し、監視するには、電力ケーブルの表面温度を測
定する熱電対をケーブル表面に取付ける必要があり、ま
た電力ケーブルの表面からの放散熱流を測定するために
熱流センサの差働熱電対をケーブル表面に取付ける必要
がある。In order to measure and monitor the conductor temperature of a power cable by the above method, a thermocouple for measuring the surface temperature of the power cable must be attached to the cable surface, and the dissipated heat flow from the surface of the power cable must be measured. The differential thermocouple of the heat flow sensor needs to be attached to the cable surface for the measurement.
【０００４】[0004]
【発明が解決しようとする課題】例えば、２７５ｋＶ系
統の超高圧電力ケーブル線路の絶縁接続部近傍において
は、避雷器等の保護装置が取付けられている場合におい
ても、ケーブルのアルミニウムシースと大地間に３０ｋ
Ｖ程度のサージ電圧が発生することが実測されている。For example, in the vicinity of the insulation connection portion of the 275 kV system ultra-high voltage power cable line, even if a protective device such as a lightning arrester is attached, a cable of 30 k may be provided between the aluminum sheath of the cable and the ground.
It has been actually measured that a surge voltage of about V is generated.
【０００５】上記のように電力ケーブルの導体温度を監
視する目的で、ケーブルの表面温度やケーブル表面から
の放散熱流を測定するために、ケーブルのポリエチレン
や塩化ビニル組成物等から成る最外側被覆の外表面に直
接に、熱電対や差働熱電対を常設的に取付けている場合
には、サージが襲来したときに、熱電対が接続されてい
る測定器に熱電対およびこれに接続する補償導線を介し
てサージが侵入するおそれがある。As described above, for the purpose of monitoring the conductor temperature of the power cable, in order to measure the surface temperature of the cable and the radiant heat flow from the cable surface, the outermost coating of the cable such as polyethylene or vinyl chloride composition is used. When a thermocouple or differential thermocouple is permanently installed directly on the outer surface, in the event of a surge, the thermocouple and the compensating lead wire connected to it are connected to the measuring instrument to which the thermocouple is connected. There is a risk that surge will enter through the.
【０００６】本願発明者等の実験によれば、電力ケーブ
ルのアルミニウムシースと大地間に２ｋＶのサージ電圧
を印加した場合に５０Ｖのサージが熱電対に接続された
補償導線に侵入するという結果も得ており、上記のよう
に電力ケーブルのアルミニウムシースと大地間に３０ｋ
Ｖものサージ電圧が発生する場合には、ｋＶオーダーの
サージが熱電対に接続された測定器に侵入するおそれが
ある。このようなサージ電圧に耐え得るように保護回路
を測定器の入力側もしくは内部に設けることは困難であ
り、また測定器に保護回路を設けたとしても、安全性、
信頼性の面で問題がある。According to the experiments conducted by the inventors of the present application, it is also possible to obtain the result that when a surge voltage of 2 kV is applied between the aluminum sheath of the power cable and the ground, a surge of 50 V penetrates into the compensating lead wire connected to the thermocouple. As mentioned above, 30k between the aluminum sheath of the power cable and the ground
When a surge voltage as high as V is generated, a surge of the order of kV may enter the measuring instrument connected to the thermocouple. It is difficult to provide a protective circuit on the input side or inside of the measuring instrument so as to withstand such surge voltage, and even if the protective circuit is provided in the measuring instrument, safety,
There is a problem in terms of reliability.
【０００７】本発明は上記の点に鑑みてなされたもの
で、ケーブル表面に取付けた熱電対に侵入するサージ電
圧自体を低減し、熱電対に接続された測定器に高電圧の
サージ電圧が印加されるのを防止することを目的とする
ものである。The present invention has been made in view of the above points, and it is a surge electric current which enters a thermocouple mounted on the surface of a cable.
The pressure itself is reduced and high voltage is applied to the measuring instrument connected to the thermocouple.
The purpose is to prevent a surge voltage from being applied .
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明のケーブル被覆表面の熱電対取付部は、金属
シースを有する電力ケーブルの絶縁体からなる最外側被
覆の外表面に導体箔層を設け、該導体箔上に絶縁フィル
ム層を設け、該絶縁フィルム層上に熱電対を取付けると
共に、上記導体箔層を接地し、前記熱電対に接続された
測定器に侵入するサージ電圧を低減することを特徴とす
るものである。 In order to achieve the above object, the thermocouple attachment portion of the cable coating surface of the present invention is made of metal.
A conductor foil layer is provided on an outer surface of an outermost cover made of an insulator of a power cable having a sheath, an insulating film layer is provided on the conductor foil, and a thermocouple is mounted on the insulating film layer. , Grounded the conductor foil layer and connected to the thermocouple
Characterized by reducing the surge voltage entering the measuring instrument
Things.
【０００９】上記においていう熱電対は、既に上記した
所から明らかな通り、また後記の実施例において示すよ
うに、温度測定用の熱電対だけを意味するものではな
く、熱流測定等に用いる差働熱電対をも包含するもので
ある。The thermocouple referred to above does not mean only a thermocouple for temperature measurement, as is clear from the above-mentioned points, and as shown in the examples described later, it is a differential used for heat flow measurement and the like. It also includes a thermocouple.
【００１０】[0010]
【作用】ケーブルの金属シースと大地間のサージ電圧
は、ケーブル外表面に取付けた熱電対の先端部分に侵入
する前に、接地した導体箔で遮られ、吸収されるので、
熱電対を介して補償導線および測定器に侵入するサージ
電圧は著しく低減される。[Function] The surge voltage between the metal sheath of the cable and the ground is shielded and absorbed by the grounded conductor foil before entering the tip of the thermocouple mounted on the outer surface of the cable.
The surge voltage entering the compensating wire and the measuring instrument via the thermocouple is significantly reduced.
【００１１】[0011]
【実施例】本発明の詳細を実施例により、また図面に基
づき以下に説明する。図１は電力ケーブルの表面温度の
多点測定のシステム構成図で、本発明の実施例が含まれ
ている。図１において、１は温度センサボックスで、ケ
ーブル線路の長さ方向に沿って多数個設置されている。
２は多点温度測定装置であり、多数個の温度センサボッ
クス１，１，・・・と多点温度測定装置２との間は図示
のように信号ケーブル３により接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below by way of embodiments and with reference to the drawings. FIG. 1 is a system configuration diagram of multi-point measurement of the surface temperature of a power cable, which includes an embodiment of the present invention. In FIG. 1, reference numeral 1 is a temperature sensor box, and a plurality of temperature sensor boxes are installed along the length direction of the cable line.
Reference numeral 2 denotes a multipoint temperature measuring device, and a large number of temperature sensor boxes 1, 1, ... And the multipoint temperature measuring device 2 are connected by a signal cable 3 as shown in the drawing.
【００１２】電力ケーブルのアルミニウムシース等の金
属シースの外側に例えばポリエチレン組成物或は塩化ビ
ニル組成物から成るシース或は防食層として形成された
最外側の被覆層４の表面には例えば銅およびコンスタン
タンから成る熱電対５が取付けられ、該熱電対５は補償
導線６の例えば銅およびコンスタンタンから成る絶縁導
体６１および６２を介して温度センサボックス１に接続
されている。６３は補償導線６のシールド層で、該シー
ルド層は上記信号ケーブル３の接地されたシールド層３
４と接続されている。図１では図面を簡単化するために
１個の温度センサボックスについてだけ、上記の熱電対
５の取付け、補償導線６を示しているが、他の温度セン
サボックス１，１，・・・においても同様に構成されて
いる。 Gold such as aluminum sheath of power cable
Thermocouple 5 on the outside, for example, the polyethylene composition or the formed <br/> outermost surface of the coating layer 4 as the sheath or anticorrosion layer consists of polyvinyl chloride composition of the genus sheath made of such as copper and constantan , And the thermocouple 5 is connected to the temperature sensor box 1 via insulated conductors 61 and 62 of compensating conductors 6 made of, for example, copper and constantan. Reference numeral 63 denotes a shield layer of the compensating conductor 6, which is the grounded shield layer 3 of the signal cable 3.
4 is connected. In FIG. 1, the attachment of the thermocouple 5 and the compensating lead wire 6 are shown only for one temperature sensor box in order to simplify the drawing, but the other temperature sensor boxes 1, 1, ... It is similarly configured.
【００１３】７は上記の温度センサボックス１を接地す
る接地線で、この接地線７は信号ケーブル３のシールド
層３４にも接続され、信号ケーブルのシールド層は多数
個所において接地されている。接地線７には、シールド
層−接地線−大地−他の接地線−シールド層の閉ループ
に生じる循環電流を抑制するために０．１μＦ程度のコ
ンデンサ８が介挿されている。Reference numeral 7 is a ground wire for grounding the temperature sensor box 1 described above. The ground wire 7 is also connected to the shield layer 34 of the signal cable 3, and the shield layer of the signal cable is grounded at many points. A capacitor 8 of about 0.1 μF is inserted in the ground line 7 in order to suppress a circulating current generated in a closed loop of the shield layer-ground line-ground-other ground line-shield layer.
【００１４】ケーブルの被覆層４表面の熱電対５の取付
けは、本発明に従い、次のようになされている。まず、
被覆層４の表面に導体箔層９を設ける。該導体箔層９
は、例えば、厚さ０．１ｍｍ、縦横それぞれ２０ｍｍの
大きさを有する正方形のアルミ箔層であり、粘着剤もし
くは接着剤により貼着されている。そして、該導体箔層
９は接地線１０により接地される。この接地は、図示す
るように、導体箔層９に接続された接地線１０を補償導
線６のシールド層６３（上記の通り信号ケーブル３のシ
ールド層３４と接続されている）と接続することにより
行う、すなわち、補償導線６のシールド層６３を介して
行うのが最も簡便で、有利である。The thermocouple 5 is attached to the surface of the coating layer 4 of the cable according to the present invention as follows. First,
A conductor foil layer 9 is provided on the surface of the coating layer 4. The conductor foil layer 9
Is, for example, a square aluminum foil layer having a thickness of 0.1 mm and a length and width of 20 mm, and is adhered with an adhesive or an adhesive. The conductor foil layer 9 is grounded by the ground wire 10. This grounding is performed by connecting the ground wire 10 connected to the conductor foil layer 9 to the shield layer 63 of the compensation conductor 6 (which is connected to the shield layer 34 of the signal cable 3 as described above), as shown in the figure. It is most convenient and advantageous to perform it, that is, through the shield layer 63 of the compensation conducting wire 6.
【００１５】導体箔９上には絶縁フィルム層１１を設け
る。絶縁フィルム層１１は、例えばポリエチレンフィル
ム或いは弗素樹脂フィルム等の耐熱性、耐化学薬品性、
電気絶縁性が良いフィルムから成り、厚さは０．２〜
０．３ｍｍ程度が好ましい。厚さが薄すぎると熱電対の
先端がフィルムを突き破るおそれがあり、厚すぎると温
度測定の精度が悪くなるおそれがある。絶縁フィルム層
１１の広さは上記の導体箔層９と同程度でよい。An insulating film layer 11 is provided on the conductor foil 9. The insulating film layer 11 is made of, for example, a polyethylene film or a fluororesin film, which has heat resistance, chemical resistance,
It consists of a film with good electrical insulation and has a thickness of 0.2-
It is preferably about 0.3 mm. If the thickness is too thin, the tip of the thermocouple may break through the film, and if it is too thick, the accuracy of temperature measurement may deteriorate. The size of the insulating film layer 11 may be the same as that of the conductor foil layer 9 described above.
【００１６】熱電対５は、上記の絶縁フィルム層１１上
に、熱電対の先端の接合部５１が絶縁フィルム層に接す
るように取付けられる。そして熱電対の先端が絶縁フィ
ルム層１１から浮き上らないように例えば薄い接着テー
プを熱電対先端上に貼り付ける。The thermocouple 5 is mounted on the insulating film layer 11 so that the joint portion 51 at the tip of the thermocouple is in contact with the insulating film layer. Then, for example, a thin adhesive tape is attached on the tip of the thermocouple so that the tip of the thermocouple does not float up from the insulating film layer 11.
【００１７】なお、図１では接地線１０を用いて導体箔
層９を補償導線６のシールド層６３と接続しているが、
通常は軟銅線編組体から成るシールド層６３を直接に導
体箔層９に押し付け、これを覆うように絶縁フィルム層
を貼り付けることにより、シールド層６３と導体箔層９
とを接続してもよい。In FIG. 1, the conductor wire layer 9 is connected to the shield layer 63 of the compensation conductor wire 6 by using the ground wire 10.
Normally, the shield layer 63, which is made of annealed copper wire braid, is directly pressed onto the conductor foil layer 9, and an insulating film layer is attached so as to cover the shield layer 63 and the conductor foil layer 9.
May be connected.
【００１８】補償導線６の導体６１，６２は、温度セン
サボックス１内において信号ケーブル３内の補償導線の
導体３１および３２に接続されるが、導体６２と導体３
２とは常時は開の接点１０１を介して接続されている。
すなわち、多数個の温度センサボックス１，１・・・に
それぞれ接続されている熱電対５は、多点温度測定器２
に対して並列に接続されている。多点温度測定器２内の
アドレス信号発生回路（図示せず）は、アドレス信号１
〜ｎを順次に発生し、該アドレス信号は信号ケーブル３
のアドレス信号伝送線３３（アドレス信号が８ビットの
場合は８本の伝送線を用いる）を介して各温度センサボ
ックスのアドレス読取回路１０２へ送られる。各読取回
路１０２は、送られたアドレス信号が予め与えられた自
己のアドレス番号と一致したときに上記の接点１０１を
一時的に閉成し、熱電対５の起電力が多点温度測定器２
に与えられる。かくして、ケーブルの被覆層４に取付け
られた多数個の熱電対により順次に被覆層表面の温度を
測定することができる。The conductors 61 and 62 of the compensating conductor 6 are connected to the conductors 31 and 32 of the compensating conductor in the signal cable 3 in the temperature sensor box 1, but the conductor 62 and the conductor 3 are connected to each other.
2 is connected via a contact 101 that is normally open.
That is, the thermocouples 5 connected to the plurality of temperature sensor boxes 1, 1, ...
Are connected in parallel to. The address signal generating circuit (not shown) in the multi-point temperature measuring device 2 uses the address signal 1
To n are sequentially generated, and the address signal is the signal cable 3
Is transmitted to the address reading circuit 102 of each temperature sensor box via the address signal transmission line 33 (8 transmission lines are used when the address signal is 8 bits). Each reading circuit 102 temporarily closes the above-mentioned contact 101 when the sent address signal coincides with a pre-given address number, and the electromotive force of the thermocouple 5 is the multipoint temperature measuring device 2.
Given to. Thus, the temperature of the coating layer surface can be sequentially measured by a large number of thermocouples attached to the coating layer 4 of the cable.
【００１９】図２は、前記の熱流法によりケーブルの導
体温度を監視するための熱流測定のシステム構成図であ
り、本発明の実施例が含まれている。図３は熱流センサ
の構成を説明するための説明図である。ケーブルの被覆
層４に取付けられている熱流センサ２０は、図３に示す
とおり、ケーブルの被覆層４表面からの放散熱流を測定
するための、例えば、銅線２１１およびコンスタンタン
線２１２とから成る差働熱電対２１と、ケーブルの被覆
層４の表面の温度を測定するための、例えば銅線２２１
とコンスタンタン線２２２とから成る熱電対２２とを含
んでいる。FIG. 2 is a system configuration diagram of the heat flow measurement for monitoring the conductor temperature of the cable by the heat flow method, which includes an embodiment of the present invention. FIG. 3 is an explanatory diagram for explaining the configuration of the heat flow sensor. The heat flow sensor 20 attached to the cable cover layer 4 comprises, for example, a copper wire 211 and a constantan wire 212 for measuring the radiated heat flow from the surface of the cable cover layer 4 as shown in FIG. For example, a copper wire 221 for measuring the temperature of the surface of the working thermocouple 21 and the coating layer 4 of the cable.
And a thermocouple 22 composed of a constantan wire 222.
【００２０】熱流センサの差働熱電対２１および熱電対
２２は、補償導線として例えば３本の銅線２３１と１本
のコンスタンタン線２３２を有し、かつシールド層２３
３を備えた熱流センサケーブル２３により熱流測定器２
４に接続されている。この熱流センサ２０のケーブルの
被覆層４への取付部は本発明に従って構成され、図１に
ついて説明した熱電対の取付けの場合とほぼ同様であ
る。The differential thermocouple 21 and the thermocouple 22 of the heat flow sensor have, for example, three copper wires 231 and one constantan wire 232 as compensating conductors, and the shield layer 23.
The heat flow sensor cable 23 provided with the heat flow measuring device 2
4 is connected. The attachment portion of the heat flow sensor 20 to the coating layer 4 of the cable is constructed according to the present invention, and is substantially the same as the attachment of the thermocouple described with reference to FIG.
【００２１】すなわち、ケーブルの被覆層４上に厚さ
０．１ｍｍ程度の導体箔層９を設け、該導体箔層９を接
地線１０により接地する。この接地も、接地線１０を熱
流センサケーブルのシールド層２３３と接続し、これを
０．５μＦ程度の循環電流抑制用のコンデンサ２５を介
して接地するのが簡便である。導体箔層９の大きさは熱
流センサ２０のセンサ面の寸法（例えば直径４０ｍｍ）
に適合するように適宜に選定する。That is, the conductor foil layer 9 having a thickness of about 0.1 mm is provided on the coating layer 4 of the cable, and the conductor foil layer 9 is grounded by the ground wire 10. Also for this grounding, it is convenient to connect the ground wire 10 to the shield layer 233 of the heat flow sensor cable and ground it via the circulating current suppressing capacitor 25 of about 0.5 μF. The size of the conductor foil layer 9 is the size of the sensor surface of the heat flow sensor 20 (for example, diameter 40 mm).
Appropriately selected to comply with.
【００２２】導体箔層９上には、既に図１について述べ
た所と同様に、絶縁フィルム層１１を設け、この絶縁フ
ィルム層１１上に差働熱電対２１と熱電対２２とを含む
熱流センサ２０を取付ける。この取付けは、例えば、絶
縁フィルム層１１として両面接着（もしくは粘着）テー
プを用い、熱流センサのセンサ面を絶縁フィルム層に接
着させることにより簡易に行うことができる。An insulating film layer 11 is provided on the conductor foil layer 9 in the same manner as described above with reference to FIG. 1, and a heat flow sensor including a differential thermocouple 21 and a thermocouple 22 is provided on the insulating film layer 11. Install 20. This attachment can be easily performed, for example, by using a double-sided adhesive (or adhesive) tape as the insulating film layer 11 and adhering the sensor surface of the heat flow sensor to the insulating film layer.
【００２３】[0023]
【発明の効果】上記説明した本発明によるケーブル被覆
の熱電対取付部の効果を実験により確めたところ、次の
通りであった。図１に示すようなシステムに構成されか
つ本発明に従って最外部のプラスチックシースに熱電対
を取付けた電力ケーブル実験線路のアルミニウムシース
を課電端側において２ｋΩの抵抗を介して接地し、該ア
ルミニウムシースにインパルス電圧発生装置により３０
ｋＶのインパルス電圧を印加したときに、信号ケーブル
の補償導線相互間およびアドレス信号伝送線の線間に生
じるサージ電圧をサージ波形測定器により観測した所、
それぞれ１２Ｖおよび１５Ｖであった。The effect of the thermocouple mounting portion of the cable coating according to the present invention described above was confirmed by experiments, and it was as follows. The aluminum sheath of the power cable experimental line configured in the system as shown in FIG. 1 and having a thermocouple attached to the outermost plastic sheath according to the present invention is grounded through a resistance of 2 kΩ on the side of the applied voltage, and the aluminum sheath is grounded. 30 by the impulse voltage generator
When a surge voltage measuring instrument observed a surge voltage generated between the compensating conductors of the signal cable and between the address signal transmission lines when an impulse voltage of kV was applied,
It was 12V and 15V, respectively.
【００２４】また、ケーブルの被覆層の多数点の表面温
度を多点温度測定器により連続測定しながら、ケーブル
のアルミニウムシースに３０ｋＶのインパルス電圧を２
０回印加したが、温度センサボックスおよび多点温度測
定器の破損は勿論なく、温度測定の誤動作も全く生じな
かった。これに対し、従来のように熱電対をケーブルの
最外部のプラスチックシースに直接取付けた場合は、ア
ルミニウムシースに２ｋＶのインパルス電圧を加えたと
きに、信号ケーブルの補償導線の導体相互間に５０Ｖの
サージ電圧が生じた。Further, while continuously measuring the surface temperature at many points of the coating layer of the cable with a multipoint thermometer, an impulse voltage of 30 kV is applied to the aluminum sheath of the cable at 2 points.
The voltage was applied 0 times, but the temperature sensor box and the multipoint temperature measuring device were not damaged, and no malfunction of temperature measurement occurred at all. On the other hand, when the thermocouple is directly attached to the outermost plastic sheath of the cable as in the conventional case, when the impulse voltage of 2 kV is applied to the aluminum sheath, 50 V is applied between the conductors of the compensating conductor of the signal cable. A surge voltage has occurred.
【００２５】図２に示すようにシステム構成された熱流
測定用の実験線路についても同様な実験を行い、従来の
ようにケーブルの被覆層に熱流センサを直接取付けた場
合には、アルミニウムシースに５ｋＶのインパルス電圧
を印加したときに、熱流センサのケーブルの導体間に５
０Ｖのサージ電圧を生じた。これに対し、本発明に従っ
て接地された導体箔層を介在させてケーブルの被覆層に
熱流センサを取付けた場合には、アルミニウムシースに
３０ｋＶのインパルス電圧を印加したときに熱流センサ
ケーブルの導体間に生じるサージ電圧は１０Ｖに低減さ
れた。また、前記と同様に３０ｋＶ、２０回の耐サージ
試験を行ったが、全く問題ないことが確認された。A similar experiment was conducted on an experimental line for heat flow measurement having a system configuration as shown in FIG. 2. When the heat flow sensor was directly attached to the coating layer of the cable as in the conventional case, 5 kV was applied to the aluminum sheath. When applying the impulse voltage of 5
A surge voltage of 0V was produced. On the other hand, in the case where the heat flow sensor is attached to the coating layer of the cable with the grounded conductor foil layer interposed according to the present invention, when the impulse voltage of 30 kV is applied to the aluminum sheath, the heat flow sensor is connected between the conductors of the cable. The resulting surge voltage was reduced to 10V. Further, a surge resistance test was conducted 20 times at 30 kV in the same manner as above, but it was confirmed that there was no problem at all.
【００２６】上記実験結果から明らかな通り、本発明に
よれば、被覆層に熱電対や差働熱電対を取付けたケーブ
ル線路に高電圧のサージ電圧が襲来したときに熱電対や
差働熱電対を介して測定器に侵入するサージ電圧は著し
く軽減される。従って本発明に従って熱電対を取付ける
ときは、熱電対に接続された測定器の内外に高電圧サー
ジに耐え得る特殊な保護回路を設ける必要はない。As is clear from the above experimental results, according to the present invention, when a high voltage surge voltage strikes a cable line in which a thermocouple or a differential thermocouple is attached to the coating layer, the thermocouple or the differential thermocouple is used. The surge voltage entering the measuring instrument via the is significantly reduced. Therefore, when installing the thermocouple according to the present invention, it is not necessary to provide a special protection circuit capable of withstanding high voltage surges inside and outside the measuring instrument connected to the thermocouple.
【図１】電力ケーブルの表面温度の多点測定のシステム
構成図で、本発明による熱電対取付部の実施例が含まれ
ている。FIG. 1 is a system configuration diagram for multi-point measurement of surface temperature of a power cable, which includes an embodiment of a thermocouple mounting portion according to the present invention.
【図２】電力ケーブルの導体温度を監視するための熱流
測定のシステム構成図であり、本発明の実施例が含まれ
ている。FIG. 2 is a system configuration diagram of heat flow measurement for monitoring the conductor temperature of a power cable, which includes an embodiment of the present invention.
【図３】熱流センサの構成を説明する説明図である。FIG. 3 is an explanatory diagram illustrating a configuration of a heat flow sensor.
１ 温度センサボックス ２ 多点温度測定器 ４ ケーブル被覆 ５ 熱電対 ６ 補償導線 ７ 接地線 ９ 導体箔 １０ 接地線 １１ 絶縁フィルム箔 ２０ 熱流センサ ２１ 差働熱電対 ２３ 熱流センサケーブル 1 temperature sensor box 2 multi-point temperature measuring device 4 cable coating 5 thermocouple 6 compensating lead wire 7 grounding wire 9 conductor foil 10 grounding wire 11 insulating film foil 20 heat flow sensor 21 differential thermocouple 23 heat flow sensor cable
Claims (2)
体からなる最外側被覆の外表面に導体箔層を設け、該導
体箔層上に絶縁フィルム層を設け、該絶縁フィルム層上
に熱電対を取付けると共に、上記導体箔層を接地し、前
記熱電対に接続された測定器に侵入するサージ電圧を低
減することを特徴とするケーブル被覆表面の熱電対取付
部。1. Insulation of a power cable having a metal sheath
The conductive foil layer provided on the outer surface of the outermost coating of the body, the conductor foil layer on the insulating film layer is provided, with attaching the thermocouple to the insulating film layer, and ground the conductive foil layer, before
Reduce the surge voltage entering the measuring instrument connected to the thermocouple.
The thermocouple mounting part on the surface of the cable coating, which is characterized in that
接続する補償導線の接地されたシールド層を介して行わ
れていることを特徴とする請求項１記載のケーブル被覆
表面の熱電対取付部。2. The thermoelectric on the surface of the cable coating according to claim 1, wherein the conductor foil is grounded via a grounded shield layer of a compensating lead wire connecting the thermocouple to the measuring instrument. Pair mounting part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3313930A JP2681563B2 (en) | 1991-10-31 | 1991-10-31 | Thermocouple mounting part on the surface of cable coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3313930A JP2681563B2 (en) | 1991-10-31 | 1991-10-31 | Thermocouple mounting part on the surface of cable coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05126648A JPH05126648A (en) | 1993-05-21 |
| JP2681563B2 true JP2681563B2 (en) | 1997-11-26 |
Family
ID=18047229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3313930A Expired - Lifetime JP2681563B2 (en) | 1991-10-31 | 1991-10-31 | Thermocouple mounting part on the surface of cable coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2681563B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634462A (en) * | 2015-02-06 | 2015-05-20 | 华南理工大学 | Selection method for epoxy mud thickness during measurement of cable skin temperatures |
| KR102073845B1 (en) * | 2019-09-25 | 2020-02-05 | 김병천 | Rail Temperature Detection Apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS584975B2 (en) * | 1979-12-21 | 1983-01-28 | 東北電力株式会社 | temperature measuring device |
| JPH01150433U (en) * | 1988-04-06 | 1989-10-18 |
-
1991
- 1991-10-31 JP JP3313930A patent/JP2681563B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05126648A (en) | 1993-05-21 |
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