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1. 发明专利

JPH10293152A METHOD FOR TESTING WITHSTAND VOLTAGE OF RUBBER AND PLASTIC INSULATED POWER CABLE 失效
公开(公告)号：JPH10293152A
公开(公告)日：1998-11-04
申请号：JP10070197
申请日：1997-04-18
申请人： CHUBU ELECTRIC POWER , FURUKAWA ELECTRIC CO LTD
发明人： UCHIDA KATSUMI , KATO YOICHI , SAKAKIBARA HIROYUKI , TANAKA HIDEO , ICHIYANAGI NAOTAKA
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To screen a cable having a water tree causing a trouble upon intrusion of a lightning impulse voltage by determining the relation between the lightning impulse breakdown voltage and the test waveform breakdown voltage and then applying a test waveform breakdown voltage to a cable to be tested. SOLUTION: Relation between the lightning impulse breakdown voltage and the test waveform breakdown voltage is determined from the relation between the water tree deterioration state and the lightning impulse breakdown voltage and the relation between the water tree deterioration state and the test waveform breakdown voltage. Screening of water tree is then performed by applying a specified test waveform voltage to a cable to be tested. More specifically, a cable having a water tree causing a trouble upon intrusion of a lightning impulse voltage can be screened by applying a test waveform voltage other than a lightning impulse in place of a lightning impulse voltage which is difficult to be applied over the entire line. Since this method is also applicable to a long cable, reliability of an actual line can be ensured.

2. 发明专利

JPH1066255A OXIDE SUPERCONDUCTING CURRENT-LIMITING ELEMENT 失效
公开(公告)号：JPH1066255A
公开(公告)日：1998-03-06
申请号：JP24108396
申请日：1996-08-23
申请人： FURUKAWA ELECTRIC CO LTD , CHUBU ELECTRIC POWER
发明人： TSUBOUCHI HIROKAZU , MUKOYAMA SHINICHI , ICHIYANAGI NAOTAKA , NAGAYA SHIGEO , SHIMONOSONO TAKAAKI
IPC分类号： H01L39/16 , H01C7/00 , H02H9/02
摘要： PROBLEM TO BE SOLVED: To make it possible to, if any short-circuit fault occurs, limit short- circuit current at high speed with a small-sized element. SOLUTION: An oxide superconductor 1 is anisotropic in the direction in which a main lead wire 2 is connected and in the c-axis direction perpendicular thereto. Control lead wires 3 are connected to the end faces of the said oxide superconductor 1 in the caxis direction. One of the control lead wires 3 is connected to the main lead wire 2 in the stage precedent to the oxide superconductor 1, and the other control lead wire 3 is connected to the main lead wire 2 in the stage following the oxide superconductor 1. Thus current branching from the main lead wire 2 is let through the oxide superconductor 1 in the c-axis direction. If an excessive current is passed through, this brings the oxide superconductor 1 in normal conduction at high speed, and limits the current with a resultant resistance.

3. 发明专利

JPH09251003A TESTING METHOD FOR JUDGING LIFE OF RUBBER AND PLASTIC CABLE 失效
公开(公告)号：JPH09251003A
公开(公告)日：1997-09-22
申请号：JP5873696
申请日：1996-03-15
申请人： CHUBU ELECTRIC POWER , FURUKAWA ELECTRIC CO LTD
发明人： YAMAMOTO MASAHIRO , UCHIDA KATSUMI , KOBAYASHI SHINICHI , KAWAMURA YOSHIHIRO , TANAKA HIDEO , ICHIYANAGI NAOTAKA
IPC分类号： G01R31/12 , G01N27/00 , G01N27/92
摘要： PROBLEM TO BE SOLVED: To clarify the remaining life by considering the request for judgment as to how long the cable that is degradaded by water tree lasts hereinafter, and performing the withstand voltage test. SOLUTION: The length of water tree, which is destructed by the operating voltage of a cable, is obtained based on the relationship between the length of the grown water tree and the breakdown voltage of the remaining commercial frequency of alternating current (AC) of the cable having the water tree. The growing speed of the water tree per one year is obtained and evaluated by the relationship between the operating time and the length or the water tree. The growing speed is multiplied by the years for assuring the remaining life, and the length of the water tree expected to grow in the period is obtained. The withstand voltage test of the line is performed by the remaining AC breakdown voltage for the length of the water tree, which is obtained by subtracting the estimated length of the water tree from the length of the water tree that is destructed by the operating voltage. Thus, the remaining life is assured. Furthermore, the dumped oscillation frequency and the extremely low-frequency voltage are combined and used for making the test equipment compact. In addition, partial discharge measurement is used together to confirm the soundness of the cable more securely.

4. 发明专利

JPH0785734A SUPERCONDUCTING BUS BAR 失效
公开(公告)号：JPH0785734A
公开(公告)日：1995-03-31
申请号：JP17619493
申请日：1993-06-23
申请人： FURUKAWA ELECTRIC CO LTD , CHUBU ELECTRIC POWER
发明人： TANAKA SATORU , FUJII OSAMU , ICHIYANAGI NAOTAKA , FURUTO YOSHIO , ITO TAKESHI , NAGAFUSA TOSHIAKI , MISAWA HIROKAZU
IPC分类号： H01B12/02 , H01B12/16 , H01F6/06
摘要： PURPOSE:To provide a superconducting bus bar having high electrical insulation in which movement of a superconductor due to electromagnetic force is prevented and cooling of the superconductor is improved, by improving the structure of a core. CONSTITUTION:A cryogenic regrigerant 5 flows inside a hollow tube 4 (e.g. a copper pipe) containing superconductors 1, 2 therein. A spacer 6 is interposed between the superconductors 1, 2 and the inner surface of the hollow tube 4. The hollow tube 4 is covered with an electrically insulating layer 3, which is covered with an earth electrode layer 7. Two cores such constituted as above are bundled with, e.g. a glass tape 8. The spacer 6 is conductive or semiconductive. A plurality of the cores are preferably bundled with a conductive or electrically insulative tape material or wire rod.

5. 发明专利

JPH10154421A TRIPLEX-TYPE CV CABLE 失效
公开(公告)号：JPH10154421A
公开(公告)日：1998-06-09
申请号：JP31042196
申请日：1996-11-21
申请人： CHUBU ELECTRIC POWER , FURUKAWA ELECTRIC CO LTD
发明人： KAWAI TAKAYUKI , NAGATA TATSUYA , KAWAMURA YOSHIHIRO , TANAKA HIDEO , ICHIYANAGI NAOTAKA
IPC分类号： H01B7/42 , H01B9/00 , H01B7/34
摘要： PROBLEM TO BE SOLVED: To increase short-time power transmission capacity, and also increase normal power transmission capacity, without changing the outer diameter of a triplex-type CV cable. SOLUTION: Cables 1 and heat storage pipes 2 inside of which heat storage material is filled are stranded, so as to form a triplex-type CV cable. The heat storage material, such as paraffin or the like, is filled inside the heat storage pipe 2, liquefying latent heat when the heat material is melted is utilized, so as to increase the heat capacity of a cable portion to increase short time power transmission capacity. A heat storage pipe diameter is an outer diameter or more, guaranteeing a time period of 30 minutes in which a conductor temperature rise is a permissible value or less with respect to 1.5 times or more overload current, and is set a diameter or less, so as to get in the envelope periphery of the triplex-type CV cable. Further, by using the cable in which the insulating thickness of the CV cable is reduced, the outer diameter of the cable is nearly the same as that of the cable of same voltage class, its conductor size is increased, and normal power transmission capacity is increase.

6. 发明专利

JPH1040978A SUPERCONDUCTING CABLE LINE AND SUPERCONDUCTING CABLE CONNECTION PORTION 失效
公开(公告)号：JPH1040978A
公开(公告)日：1998-02-13
申请号：JP19778196
申请日：1996-07-26
申请人： FURUKAWA ELECTRIC CO LTD , TOKYO ELECTRIC POWER CO
发明人： ICHIYANAGI NAOTAKA , MUKOYAMA SHINICHI , TSUBOUCHI HIROKAZU , MIYOSHI KAZUTOMI , HARA CHIKUSHI , ISHII HIDEO , HONJO SHOICHI
IPC分类号： H01R4/68
摘要： PROBLEM TO BE SOLVED: To obtain a superconducting cable line equalizing a shield current in plural shield layers and preventing magnet field leakage during mass current conducting by mutually replacing the connection portion position of each shield layer on both sides and connecting it at the connection portion in a superconducting cable wire path having plural shield layers. SOLUTION: In a superconducting cable having plural shield layers 5, 6, and 7 insulated each other, the connection portion position of each shield layer on both sides is replaced with each other (inside position is replaced with outside position, middle position with inside position and outside position with middle position) and connected at the required connection portions so as to have the substantially same cable length in which each shield layer after connecting a set of cables of wire paths is from the inner layer and the outer layer. The connection portion of the superconducting cable has the following configuration. A cable conductor 1 is connected at a connection portion 2, an insulator 3 is connected at a reinforce insulator 4, after which the cable shield layers on both sides are wound back and stage-cut, the connection portion position of each shield layer on both sides is replaced with each other and connected, and a heat insulation sleeve 9 is covered and connected to a cable heat insulation tube 10.

7. 发明专利

JPH05188109A METHOD FOR MEASURING PARTIAL DISCHARGE 失效
公开(公告)号：JPH05188109A
公开(公告)日：1993-07-30
申请号：JP514092
申请日：1992-01-14
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KASUYA MASAHARU , ICHIYANAGI NAOTAKA , TANAKA HIDEO , FUJISAKI AKIRA
IPC分类号： G01R31/08 , G01R31/12
摘要： PURPOSE:To continuously monitor partial discharge of a cable or a high voltage machine without influence of ambient noise, etc., and also identify the location where the partial discharge occurs. CONSTITUTION:An optical fiber 5 is placed in the vicinity of insulators 1B, 2A of an object 1 to be measured to which high voltage is applied, and an end of the fiber 5 is connected to a light source 4 while the other end is connected to a partial discharge measuring device 7. If partial discharge occurs at a defective part of the insulators 1B, 2A of the object 1, ultrasonic waves are generated to cause a fluctuation of the plane of polarization of light propagated in the optical fiber 5. The partial discharge measuring device 7 detects the fluctuation of the plane of polarization to monitor and measure the partial discharge of the object 1. In addition, two optical fibers are placed in the vicinity of the insulator of the object to be measured, while one of the ends is connected to one end of the other fiber and folded at a loop part to detect time difference in fluctuations of the plane of polarization due to the partial discharge, whereby the location where the partial discharge occurs can be identified.

8. 发明专利

JPH0526950A METHOD FOR DETECTING DEFECTIVE PORTION OF CABLE INSULATOR 失效
公开(公告)号：JPH0526950A
公开(公告)日：1993-02-05
申请号：JP1293791
申请日：1991-01-10
申请人： FURUKAWA ELECTRIC CO LTD
发明人： TANAKA HIDEO , ICHIYANAGI NAOTAKA , MARUYAMA YOSHIO
IPC分类号： G01R31/12
摘要： PURPOSE:To enable a defective portion to be detected by applying a high voltage to cause an insulation breakdown in one portion of a cable insulator, measuring a partial discharge while conducting a commercial frequency AC voltage to a portion where no insulation breakdown resulted, and then stopping power before breakdown and destruction. CONSTITUTION:A high voltage is applied to a cable 1 for causing insulation breakdowns 3a and 3b in one portion of an insulator. Then, a signal where an amount of charge of a partial discharge is generated or increased, namely, a sign where a defective portion in a bud of a tree which is generated in the cable previously is to be broken, is detected while a commercial frequency AC voltage is applied to non-breakdown cable portion 10 where no insulation breakdown resulted. In this manner, a partial discharge which becomes the sign of breakdown in a defective portion of the insulator of the non-breakdown cable portion 10 where no insulation breakdown resulted is detected and power application is stopped before the defective portion of the insulator is broken and burnt. For enabling a defective portion of a lightning impulse voltage to be detected, a high voltage of one-shot voltage waveform which contains a high-frequency component of 1kHz or higher is used.

9. 发明专利

JPH0522823A INSULATING BLOCK FOR CONNECTING POWER CABLE AND CONNECTING METHOD USING SAID INSULATING BLOCK 失效
公开(公告)号：JPH0522823A
公开(公告)日：1993-01-29
申请号：JP19359091
申请日：1991-07-09
申请人： FURUKAWA ELECTRIC CO LTD , TOKYO ELECTRIC POWER CO
发明人： TAKAHASHI YOSHIHISA , SAKUMA SUSUMU , ICHIYANAGI NAOTAKA , NODA HAJIME , SHINAGAWA NOBUYUKI
IPC分类号： H02G1/14 , H02G15/18
摘要： PURPOSE:To shorten the length of the connecting section of a power cable, and to reduce an outside diameter by abutting an insulating block composed of cylindrical incomplete crosslinking polyethylene containing an unreacted crosslinking material against the connecting section of the power cable, superposing a heat-shrinkable tubing on the outside of the insulating block and heating and pressing the tubing. CONSTITUTION:The end section of a power cable to be connected is peeled in a stepped shape, and external semiconducting layers 51a, 51b, insulators 47a, 47b, internal semiconducting layers 45a, 45b and cable conductors 41a, 41b are exposed. The cable conductors 41a, 41b are welded and bonded 43. An insulating block 33 consisting of an internal semiconducting layer 23, an incomplete crosslinking polyethylene insulator 21 and an external semiconducting layer 29 is abutted against the connecting section of the cable, and semiconducting heat-shrinkable tubings 49a, 49b are superposed on the outer circumference of the insulating block 33. Crosslinking is advanced through heating and pressing, and the stepped peeling section of the cable and the insulating block 33 are fast stuck. Accordingly, the length of the connecting section is shortened, and an outside diameter is reduced.

10. 发明专利

JPH04101623A SUPERCONDUCTING CURRENT LIMITER 失效
公开(公告)号：JPH04101623A
公开(公告)日：1992-04-03
申请号：JP21577190
申请日：1990-08-17
申请人： FURUKAWA ELECTRIC CO LTD
发明人： TANAKA SATORU , HARADA NAKASUKE , ICHIYANAGI NAOTAKA
IPC分类号： H02H9/02 , H01B12/02 , H01L39/00 , H01L39/16
摘要： PURPOSE:To prevent crack of a superconducting current limiting element by supporting the limiting element in a state that the limiter is not secured to an electrically insulting support. CONSTITUTION:A board 4 is covered with a cover plate 5 in a state that a superconducting current limiting element 2 is contained in a groove 6, and integrated with the plate 5 by adhering, etc. Thus, the current limiting element 2 is contained in a hole 8 of an electrically insulating support 3. A gap is provided between the periphery of the current limiting element 2 and the inner surface of the hole 8, cryogenic refrigerant such as liquid nitrogen, etc., is filled in the gap to directly cool the current limiting element 2. The current limiting element 2 is merely placed on the bottom of the hole 8, but not secured to the board 4. Thus, the current limiting element 2 and the support 3 can thermally be elongated and contracted independently from one another.

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