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1. 发明专利

JPH09196277A THERMALLY FUSED CONNECTION OF POLYETHYLENE PIPE 失效
公开(公告)号：JPH09196277A
公开(公告)日：1997-07-29
申请号：JP995996
申请日：1996-01-24
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA
IPC分类号： F16L47/02
摘要： PROBLEM TO BE SOLVED: To facilitate operations and to eliminate the need for skill by providing a recess in the center of the outer surface of each polyethylene short pipe, locating the butting parts of the polyethylene pipes on the recesses, and winding a corrosion resistant tape on the outsides of the butting parts. SOLUTION: Each polyethylene short pipe PJ has a heating wire 8 built in near the outer surface of its cylindrical pipe main body 7, and a circumferentially extending recess 9 is provided in the center of the outer surface. The heating wire 8 is formed into non-inductive windings and buried in the pipe main body 7, with its terminal raised from the center recess 9 and extended to the outside through the space between the butting parts of the polyethylene pipes P, P to enable a connection with a power supply. The butting parts of the polyethylene pipes P, P are located in such recesses 9, and a corrosion resistant tape is tightly wound from the outside to ensure a thermally fused connection with the tightening force used in winding the corrosion resistant tape 5.

2. 发明专利

JPH07159479A PARTIAL DISCHARGE MEASURING METHOD 失效
公开(公告)号：JPH07159479A
公开(公告)日：1995-06-23
申请号：JP33999193
申请日：1993-12-07
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA
IPC分类号： G01R31/12
摘要： PURPOSE:To easily discriminate the presence/absence of a partial discharge signal by subtracting signals of each phase of three phases so that only the partial discharge signal can be left and noise signals can be removed. CONSTITUTION:Insulated connecting sections 2 of A-, B-, and Cphases detect partial discharge signals or other signals containing noise by using a detecting impedance 4. Each tuning and amplifying section 5 tunes the signal detected by each section 2 at a prescribed frequency and amplifies the tuned signals. The three tuned and amplified signals are inputted to a signal synthesizing section 6 which generates an A-B signal by. adding the B-signal to the A-signal by inverting the polarity with respect to a circuit. Similarly, a B-C signal and C-A signal are generated by inverting the polarities of the C- and A-signals. Therefore, the noise component commonly contained in the A- to C-signals is removed. The synthesized signal is inputted to an oscilloscope 7 and the presence/absence of the partial discharge signal is discriminated.

3. 发明专利

JPH06289094A CABLE SHIELDING LAYER AND METHOD FOR MONITORING ABNORMALITY OF SHEATH 失效
公开(公告)号：JPH06289094A
公开(公告)日：1994-10-18
申请号：JP9387093
申请日：1993-03-30
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA
IPC分类号： G01R31/12 , G01R31/02
摘要： PURPOSE:To detect the breaking of a shielding layer and abnormality in insulation by grounding the shielding layer at both ends of cable line through capacitors, applying a DC voltage to the shielding layer all the time from one end, measuring the leaking current from a sheath, and always measuring the sheath potential at the other end. CONSTITUTION:A cable shielding layer 2 at both ends of a cable line 10 without grounding at the intermediate part is grounded through capacitors C2 and C3. The potential at a point D at one end side always becomes a value which is divided by the total capacitance of a cable insulator and the parallel capacitances of C2 and C3. When the shielding layer 2 is cut at a point F, the potential becomes the value, which is divided by the capacitance between the points D and F and the capacitor C2. A shield- layer-potential measuring part 21 is connected to the point D, and the change is detected. Then, an alarm and the like are issue. A sheath-leak-current measuring power supply 22 is connected to a point E at the other end side. A DC voltage is always applied in this way. Measurement of deteriorated insulation is performed with a sheath-leak-current measuring part 23. When abnormality is judged even in the measuring part 23, the alarm is issued. The part corresponding to the capacitor C can be grounded through high resistance.

4. 发明专利

JPH0686428A STRUCTURE OF JOINT FOR CORRUGATED PIPE 失效
公开(公告)号：JPH0686428A
公开(公告)日：1994-03-25
申请号：JP25761092
申请日：1992-09-02
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA
IPC分类号： F16L33/00 , F16L33/28 , H02G3/06
摘要： PURPOSE:To improve airtightness and work efficiency by fastening a ring so that pressure is applied, in diametral direction from outside to inside, to the elastic packing attached onto a corrugated pipe. CONSTITUTION:An elastic pacing 4, the inner face of which is the same in shape as a corrugated pipe 1, having the outer face tapered in axial direction, is inserted into the circular groove made on the inner face of the receiving metal fitting 2 set on a corrugated pipe 1. Next, a tapered ring 5, whose inner face side is tapered, is inserted from right onto the topside of the elastic packing 4. And, the ring 5 is fastened by screwing and processing it in form the right by the fastening metal fitting 3 corrugated the same as the surface of the corrugated pipe 1.

5. 发明专利

JPH0147081B2 失效
公开(公告)号：JPH0147081B2
公开(公告)日：1989-10-12
申请号：JP11075588
申请日：1988-05-07
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA
IPC分类号： H02G1/06

6. 发明专利

JPS6342217B2 失效
公开(公告)号：JPS6342217B2
公开(公告)日：1988-08-22
申请号：JP5784378
申请日：1978-05-16
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA , SUGYAMA KOICHI , ANDO YORIO , KANAMARU KIMIHARU , SATO HIDEO , MINAFUJI JUNICHI
IPC分类号： G01M3/28 , G01M3/04 , G01M3/22 , H01B13/24

7. 发明专利

JPS61200610A OPTICAL COMPOSITE CABLE 失效
公开(公告)号：JPS61200610A
公开(公告)日：1986-09-05
申请号：JP4169485
申请日：1985-03-01
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA , MURATA KEIJI
IPC分类号： H01B11/22 , G02B6/44

8. 发明专利

JPS61200609A OPTICAL FIBER COMPOSITE CABLE 失效
公开(公告)号：JPS61200609A
公开(公告)日：1986-09-05
申请号：JP4016585
申请日：1985-02-28
申请人： HITACHI CABLE
发明人： FUKAZAWA MASAKATA , MURATA KEIJI
IPC分类号： H01B11/22 , G02B6/44 , H01B9/00

9. 发明专利

JPS5562369A DETECTING METHOD FOR GROUNDDFAULT SECTION OF POWER CABLE 失效
公开(公告)号：JPS5562369A
公开(公告)日：1980-05-10
申请号：JP13550578
申请日：1978-11-02
申请人： HITACHI CABLE
发明人： SUGIYAMA KOUICHI , ANDOU YORIO , MINAFUJI JIYUNICHI , FUKAZAWA MASAKATA , KANAMARU KIMIHARU , KASHIMA SHIYUNEI
IPC分类号： G01R31/08 , H02H7/26
摘要： PURPOSE:To ensure an accurate detection for the ground-fault section in a short time by dividing the metal sheath of the cable into several sections with distribution of the relay unit each. CONSTITUTION:Metal sheath 3 of the power cable is divided into serveral sections via insulated conection box 4, and the relay unit the primary part of which is formed with SCR7 is provided at the division position each. And then the cross bond wires of the three-phase metal sheath circuit are put into saturable transformer 6 en bloc, and the output voltage is saturated when the three-phase current sum exceeds the specific level. And the sum of this output voltage and the bias voltage within the substation is supplied to the gate circuit of SCR7. In case the short- circuit trouble takes place at position F, the short-circuit current flows only between substation 1 and position F, and the SCR's between 1 and F are all ignited. Therefore, the distance from the trouble point to the position of the SCR at substation 1 can be measured by measuring the resistance between auxiliary lines b and c at substation 2.

10. 发明专利

JPS54145987A Method of producing power cable 失效
标题翻译：生产电力电缆的方法
公开(公告)号：JPS54145987A
公开(公告)日：1979-11-14
申请号：JP5477578
申请日：1978-05-09
申请人： Hitachi Cable Ltd
发明人： SUGIYAMA KOUICHI , ANDOU YORIO , SATOU HIDEO , FUKAZAWA MASAKATA , MINAFUJI JIYUNICHI , KASHIMA SHIYUNEI
IPC分类号： H01B13/22 , H01B9/02 , H01B13/00 , H01B13/26
摘要： PURPOSE: To eliminate the diterioration in the insulating body during the production of a metal sheath by welding the metal sheathed pipe, maintaining the production facility of metal sheathed tubes and the cable core into a vacuum vessel not to expose the insulator to the outside air.
CONSTITUTION: A cable is composed of a cable core made up of a conductor with an oil passage 1 and a insulator 3 and a metal sheath made of stainless steel for instance. A cable production unit 5 is provided with a vacuum deairing chambet 6 having a vacuum pump 7 for deariring. From a winding drum 1 in the vacuum deairing chamber, a cable core 15 is wound around a metal sheath production unit 12 via a guide tube 10. A metal tap is rolled around the cable core 15 and then, welded along the joint butted together. Thus, a metal sheath 16 is accomplished. Then, it is pulled outside while cooled with a cooling device 13. A cap for vacuum sealing is applied to the end of the sheathed cable thus obtained to check outside air from entering the varuum space. With such an arrangement, the exposure of the insulator to the outside air can be prevenred during the production of the metal sheath to eliminate the deterioration in the insulation.
COPYRIGHT: (C)1979,JPO&Japio
摘要翻译：目的：通过焊接金属护套管，在金属护套生产过程中消除绝缘体的分散，将金属护套管和电缆芯的生产设备保持在真空容器中，不会将绝缘体暴露在外部空气中。构成：电缆由具有油路1和绝缘体3的导体和例如由不锈钢制成的金属护套构成的电缆芯构成。电缆制造单元5设置有具有真空泵7的真空脱气斜口6，用于脱气。通过真空脱气室中的卷筒1，电缆芯15经由引导管10缠绕在金属护套生产单元12周围。金属丝锥绕缆芯15卷绕，然后沿着接头焊接在一起。因此，完成了金属护套16。然后，用冷却装置13冷却，将其拉出外部。用于真空密封的盖被施加到由此获得的护套电缆的端部以检查外部空气进入真空空间。通过这样的布置，可以在制造金属护套期间预先将绝缘体暴露于外部空气，以消除绝缘体的劣化。

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