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1. 发明专利

JPH07260871A METHOD AND APPARATUS FOR MONITORING DIELECTRIC STRENGTH OF SNOW ACCRETED INSULATOR STRING 失效
公开(公告)号：JPH07260871A
公开(公告)日：1995-10-13
申请号：JP5629494
申请日：1994-03-25
申请人： TOKYO ELECTRIC POWER CO , NGK INSULATORS LTD
发明人： OZAWA AKIO , YOSHIDA KAZUMI , ITO SUSUMU , TORIMOTO SOICHI , KONDO KUNIAKI
IPC分类号： G01R31/12
摘要： PURPOSE:To make an accurate decision by operating a withstanding voltage based on an attribute data relating to the density, conductivity, etc., of accreted snow and then comparing the withstanding voltage data with a prestored reference withstanding voltage data. CONSTITUTION:When a starting switch is turned ON, a weight data of insulator strings 2, 2 measured by a weight measuring instrument 4, a plurality of snow accretion height data measured by an ultrasonic sensor group 6A, 6B, the insulation resistance between the insulator strings 2, 2 measured by a resistance meter 7, and the value of current flowing between the electrode rods in a conductivity measuring apparatus are fed through an A/D converter and an interface to a CPU. These data are presented on the CRT screen of a display through an output interface and the A/D converter. Presence of bridge accretion of snow on the insulator strings 2, 2 is determined before presence of partial accretion of snow is determined. The number of reflection signals, delivered from the sensor group 6A, 6B to the CPU, is inputted to means for deciding the degree of danger where it is compared with a preset reference data.

2. 发明专利

JPH10144166A COMPOSITE INSULATOR 失效
公开(公告)号：JPH10144166A
公开(公告)日：1998-05-29
申请号：JP30261196
申请日：1996-11-14
申请人： NGK INSULATORS LTD
发明人： MORIYA TSUTOMU , FUKAMI YUKITERU , KONDO KUNIAKI
IPC分类号： H01B17/00 , H01B17/32
摘要： PROBLEM TO BE SOLVED: To provide the most excellent dirt withstand voltage characteristic by providing a covering having such a shape as large diameter shed portions and small diameter shed portions are alternatively arranged, and setting the ratio of a surface leak distance to the axis direction unit length of the covering axis so as to stay in a range of specific values. SOLUTION: A composite insulator with double-size shed portions is composed of a core member and a covering which is provided on the outer peripheral face of the core member and is made of insulation high molecular material. The covering has such a shape as large diameter shed portions and small diameter shed portions are alternatively arranged via sheaths, and the ratio 1/p of a surface leak distance (l) to the axis direction unit length (p) of the covering is in a range of 4.3 to 5.0. In a composite insulator with double-size shed portions, a straight line distance combining the radial direction outside tip of a large diameter shed portion and the radial direction outside tip of a small diameter shed portion (distance between shed tips (c)) is 32 to 40mm. Since a l/p value can be set in a proper range, the use amount of covering rubber for obtaining the maximum dirt withstand voltage becomes proper.

3. 发明专利

JPH06288888A METHOD AND APPARATUS FOR MEASUREMENT OF DENSITY OF SNOW 失效
公开(公告)号：JPH06288888A
公开(公告)日：1994-10-18
申请号：JP7436093
申请日：1993-03-31
申请人： TOKYO ELECTRIC POWER CO , NGK INSULATORS LTD
发明人： KIKUCHI TAKEHIKO , YOSHIDA KAZUMI , ITO SUSUMU , TORIMOTO SOICHI , KONDO KUNIAKI
IPC分类号： G01N9/00 , G01N27/22
摘要： PURPOSE:To provide a snow-density measuring apparatus which measures the density of snow simply and quickly. CONSTITUTION:A first electrode plate 1 and a second electrode plate 2 are arranged at a prescribed distance. An electrostatic capacity sensor 7 is connected to both electrode plates 1, 2. In addition, a control device 8 is connected to the sensor 7, and a display device 12 is connected to the control device 8. The specific permittivity of snow is operated by the control device 8 on the basis of an electrostatic capacity detected by the electrostatic capacity sensor 7, the density of the snow is operated on the basis of reference data, and the operated density of the snow is displayed on the display device 12.

4. 发明专利

JPH06281573A METHOD AND APPARATUS FOR MEASURING DEGREE OF STAIN OF INSULATOR 失效
公开(公告)号：JPH06281573A
公开(公告)日：1994-10-07
申请号：JP6704893
申请日：1993-03-25
申请人： NGK INSULATORS LTD
发明人： AKIZUKI MASAHIRO , KONDO KUNIAKI , ITO ATSUSHI
IPC分类号： G01N21/47 , G01N21/88 , G01N21/952 , G01R31/12
摘要： PURPOSE:To provide a measuring apparatus for quickly measuring the degree of stain an insulator. CONSTITUTION:The apparatus accommodates a laser light generator 10 which generates a laser light R1 to be cast to a to-be-measured insulator through an objective lens 14, and a CCD camera 19 which photographs a scattered reflected light R2 from the insulator through a photodetecting lens 16. The CCD camera 19 is connected to an image processing device 26 as a speckle pattern forming means which processes photographed images thereby to obtain a speckle pattern.

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