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31. 发明专利

JP2001099884A METHOD FOR DIAGNOSING CABLE 失效
公开(公告)号：JP2001099884A
公开(公告)日：2001-04-13
申请号：JP27720699
申请日：1999-09-29
申请人： HITACHI CABLE
发明人： KATAGAI TERUSHI , TANNO SHIRO , MURATA YOSHIMICHI
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To provide a method for diagnosing deterioration of insulator of a high voltage cable accurately in which a CV cable of 22 kV or below can be diagnosed with high accuracy even under a noisy environment. SOLUTION: In a method for diagnosing a power cable where a micro DC current flowing through an insulator 24 is measured by means of a measuring unit 28 while applying a DC voltage and/or an AC voltage to a CV cable 21 and then deterioration of the insulator 24 is diagnosed based on the measurements, an ultrasonic wave generator 34 transmits an ultrasonic wave through the insulator 24 in order to increase the micro DC current thus enhancing detection accuracy.

32. 发明专利

JPH11329082A ELECTRICAL INSULATING COMPOSITION AND POWER CABLE USING THE SAME 失效
公开(公告)号：JPH11329082A
公开(公告)日：1999-11-30
申请号：JP12579198
申请日：1998-05-08
申请人： HITACHI CABLE
发明人： OKUYAMA TAKESHI , KATAGAI TERUSHI , YAMAZAKI TAKANORI
IPC分类号： C08K5/09 , C08K5/20 , C08K5/36 , C08L23/00 , H01B3/44
摘要： PROBLEM TO BE SOLVED: To improve the bow-tie tree resistance while improving the distributing property so as to lower the generation of water tree by melting OH group- including fatty acid metal salt, oxidation preventing agent and the lubricant for blending at a specified ratio in the base polymer of polyolefin or ethylene copolymer. SOLUTION: A unified melting body composed of 0.005-1.000 pts.wt. of fatty acid metal salt including OH group in a molecule thereof, 0.01-1.00 pts.wt. of oxidation preventing agent, and 0.01-1.00 pts.wt. of lubricant is blended in 100 pts.wt. of the base polymer composed of polyolefin such as PR or ethylene copolymer so as to obtain an electrical insulating composition for power cable having excellent bow-tie water tree resistance. As a fatty acid metal, salt, calcium or lithium salt of hydroxy stearic acid is desirably used, and as the oxidation preventing agent, 4,4-thiobis-(3-methyl.6.1.butyl phenol) or tetrakis[methylene.3.(dodecylthio) propionate]methane is desirably used, and as a lubricant, stearic acid amide or N,N-di-oleyladipic acid amide is desirably used.

33. 发明专利

JPH11122792A INTERMEDIATE CONNECTION SECTION FOR CV CABLE 失效
公开(公告)号：JPH11122792A
公开(公告)日：1999-04-30
申请号：JP27434297
申请日：1997-10-07
申请人： HITACHI CABLE
发明人： HIWATARI SHIGEO , KATAGAI TERUSHI
IPC分类号： H01R43/00 , H02G15/08
摘要： PROBLEM TO BE SOLVED: To control partial discharging from a defective area such as external flow on the core surface, by coating or impregnating the conductive tape or an insulation tape thereon with residual element such as acetphenone, α- methylstylene, cumylalcohol or the like or alkylphenylketon. SOLUTION: An internal semi-conductive layer 2 is provided on a common conductor connecting section 1 with CV cables completely the terminated such as peeling of insulator and penciling or the like, and a reinforcing insulator 3 is also provided by the projection mold. Moreover, a conductive tape 5 and an insulation tape 6 are wound thereon bridging over the external conductive layers 4 of both CV cables, and then it is covered with a metal protection conduit 8 from the external side. Here, the conductive tape 5 or the insulation tape 6 is coated or impregnated with residual element such as acetphenone, α-methylstylene and cumylalcohol or the like or alkylphenylketon. As a result, partial discharge from a defective area such as external damage on the core surface.

34. 发明专利

JPH1186636A DC CABLE 失效
公开(公告)号：JPH1186636A
公开(公告)日：1999-03-30
申请号：JP24063397
申请日：1997-09-05
申请人： HITACHI CABLE
发明人： KATAGAI TERUSHI , YAMAZAKI TAKANORI , MURATA YOSHINAO
IPC分类号： B32B27/32 , C08L23/04 , H01B3/44 , H01B9/00
摘要： PROBLEM TO BE SOLVED: To provide a satisfactory DC insulating characteristic and lightning impulse intensity resistance and reduce the thickness of an insulating layer by providing an insulating layer, consisting of a cross-linked polyethylene and containing a polarized inorganic filler, and including a maleic anhydride denatured(MAH) polyethylene in this insulating layer. SOLUTION: The addition quantity of MAH polyethylene is set to 1-10 phr, the denaturation quantity is set to 0.1% or more, and the added quantity of a polarized inorganic filler is set to 0.5-5 phr. A part of polyethylene is kneaded with the polarized inorganic filler to form a master batch having high filling property, and the remaining part of the polyethylene is mixed thereto to a prescribed filling concentration. The MAH polyethylene is added in the mixing of the master batch with the polyethylene, and a cross-linking agent is further added thereto to form a compound. The compound is extrusion molded on a conductor with inner and outer semiconductor layers, and cross-linked by heating. As a result, the reduction in resistance to lightning impulse intensity by the polarized inorganic filler can be prevented to dispense with the increase in thickness of the insulating layer.

35. 发明专利

JPH1164415A MEASUREMENT METHOD FOR STORAGE SPACE CHARGE DISTRIBUTION OF POWER CABLE 失效
公开(公告)号：JPH1164415A
公开(公告)日：1999-03-05
申请号：JP22905097
申请日：1997-08-26
申请人： HITACHI CABLE
发明人： MURATA YOSHINAO , KATAGAI TERUSHI
IPC分类号： G01R29/24 , G01N27/60 , G01N29/00
摘要： PROBLEM TO BE SOLVED: To provide a method for measuring the storage space charge distribution of a power cable capable of performing temperature elevation and temperature control without elevating the temperature of a space charge measurement system and without bringing a temperature elevation device into contact with a storage space charge distribution measurement part. SOLUTION: The two parts of the external semiconductive layer 4 of the power cable 1 are exposed and a measurement electrode 6 to which a piezoelectric element 8 is mounted is brought into contact with the surface of a shielding layer 5 between the exposed parts. The storage space charge distribution measurement part including the exposed external semiconductive layer 4 and the mounting part of the measurement electrode 6 is irradiated with infrared rays by an infrared ray irradiation device 17 and the measurement part is heated. A pulse voltage is applied by a pulse generator 15 between the grounded shielding layer 5 and the external semiconductive layer 4, generated elastic waves generated at the time are detected by the piezoelectric element 8 and space charge distribution is measured.

36. 发明专利

JPH10322871A METALLIC SHEATH EDGE PART OF SHEATH INTERRUPTER, AND ITS PROCESSING METHOD 失效
公开(公告)号：JPH10322871A
公开(公告)日：1998-12-04
申请号：JP12439397
申请日：1997-05-14
申请人： CHUBU ELECTRIC POWER , HITACHI CABLE
发明人： KAWAI TAKAYUKI , KISHI YUKIHIRO , HIWATARI SHIGEO , KATAGAI TERUSHI , GORAI TAKASHI
IPC分类号： H02G1/14 , H02G15/08
摘要： PROBLEM TO BE SOLVED: To provide a metallic sheath edge part of a sheath interrupter, where there is little partial heating of the outer semiconductor layer of itself and the flashover strength is high, softening the electric field of the metallic sheath edged part without damaging the outer semiconductor layer or the outer semiconductor layer and a cable insulator, and its processing method. SOLUTION: When covering the periphery of a cable conductor 2 with a cable insulator 3 and an outer semiconductor layer 4 in order, surrounding the outer semiconductor layer 4 by a metallic sheath 5, edging a part of the metallic sheath 5, also surrounding the whole metallic edge part by an insulating tube 6, and sealing the space between the insulating tube 6 and the metallic sheath 5 with sealing material 7, mesh-form metal 8 is wound around each of the boarders between the above metallic sheath edged ends and the outer semiconductor layer.

37. 发明专利

JPH0473817A POWER CABLE 失效
公开(公告)号：JPH0473817A
公开(公告)日：1992-03-09
申请号：JP18488890
申请日：1990-07-12
申请人： HITACHI CABLE
发明人： KATAGAI TERUSHI
IPC分类号： H01B7/02 , H01B9/02 , H01B9/06
摘要： PURPOSE:To improve the insulating resistance of a cable insulator, and to maintain its performance for a long period of time by providing a cumyl alcohol layer on the external semiconductive layer of the cable. CONSTITUTION:A power cable is composed of a cable conductor 1, a semiconductive layer 2, an insulator 3, a semiconductive layer 4, a cumyl alcohol impregnated semiconductive cotton tape 5, a shield copper tape 6, a tape 7, a metal laminated layer 8, and of a sheath 9. While the cotton tape 5 in which cumyl alcohol is impregnated is wound around the outer periphery of the cable semiconductive layer 4, in order to prevent the further dispersive volatilization of the cumyl alcohol to the sheath 9, the vinyl sheath 9 having the metal laminated layer 8 on the inside is externally provided. A power cable of excellent insulating resistance, and of excellent performance which is continued for a long period of time, can thus be obtained.

38. 发明专利

JPS6387113A MOLD JOINT IN POWER CABLE 失效
公开(公告)号：JPS6387113A
公开(公告)日：1988-04-18
申请号：JP22750586
申请日：1986-09-26
申请人： HITACHI CABLE
发明人： KATAGAI TERUSHI , SATO HIDEO , YAMAGUCHI MASAYUKI , SEKII YASUO , IDE SHIGEO
IPC分类号： H02G1/14

39. 发明专利

JP2000221232A WATER TREE TESTING METHOD 失效
公开(公告)号：JP2000221232A
公开(公告)日：2000-08-11
申请号：JP2381699
申请日：1999-02-01
申请人： HITACHI CABLE
发明人： OKUYAMA TAKESHI , YAMAZAKI TAKANORI , KATAGAI TERUSHI , MURATA YOSHINAO
IPC分类号： G01R31/20 , G01N17/00
摘要： PROBLEM TO BE SOLVED: To reproduce such a large water tree that occurs in an actual power cable insulated with a crosslinked polyolefin-based electrical insulating composition without using any actual power cable, by using a sheet composed of the electrical insulating composition mixed with water tree accelerating deteriorating foreign matters. SOLUTION: In a water tree testing method, an integral sheet-like sample prepared by sticking a sheet composed of a crosslinked polyolefin-based electrical insulating composition mixed with water tree deteriorating foreign matters to both surface of a semiconductor element is used. One or two or more kinds of matters selected from among metal power, electrolytic materials, and aggregated compounding agent are used as the foreign matter. The metal powder includes copper powder, iron powder, aluminum powder, etc., and the electrolytic materials include sodium chloride, potassium chloride, lithium chloride, barium chloride, sodium nitrate, potassium nitrate, etc. The aggregated compounding agent include crosslinking agents, crosslinking assistants, aging preventing agents, lubricants, fillers, etc.

40. 发明专利

JPH11120845A MANUFACTURE OF POWER CABLE USING CROSS-LINKED POLYETHYLENE AS INSULATOR 失效
公开(公告)号：JPH11120845A
公开(公告)日：1999-04-30
申请号：JP29791397
申请日：1997-10-16
申请人： HITACHI CABLE
发明人： OKUYAMA TAKESHI , KATAGAI TERUSHI
IPC分类号： H01B13/14
摘要： PROBLEM TO BE SOLVED: To easily manufacture a CV power cable having higher insulating performance by melting/extruding polyethylene, having a high crystal melting point on/to the outside of a cable conductor, and raising a temperature of the whole cable again up to a temperature higher by a specific temperature than a crystal melting point of cross-linked polyethylene after this is passed through a heating pressurizing cross- linking process and a cooling process. SOLUTION: After a temperature has been raised up to a temperature higher by 5 to 15 deg.C than a crystal melting point of cross-linked polyethylene, the whole cable is annealed. A power cable by extrusively covering a peripheral of a cable conductor having the copper conductor cross-sectional area of 100 mm in an insulating thickness of 6 mm with cross-linked polyethylene having a crystal melting point of 119 deg.C, is put in a pressurizing constant temperature bath while being wound round a drum, and a temperature is raised to 130 deg.C. After annealing processing is performed by holding it for 8 hours, natural cooling is performed. In a dielectric breakdown test of the power cable by this annealing processing, results of 360 and 800 kV are respectively obtained as compared with an AC breakdown voltage value of 260 kV and an impulse breakdown voltage value of 600 kV in an unprocessed case.

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