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53. 发明专利

JPS54150661A ARRESTER 失效
公开(公告)号：JPS54150661A
公开(公告)日：1979-11-27
申请号：JP5963178
申请日：1978-05-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAKO ISAO , IMATAKI MITSUMASA , FUJIWARA YUKIO
IPC分类号： H01T4/04 , H01T1/00
摘要： PURPOSE:To simplify the construction of an arrester and assure its airtightness, by providing a gasket in contact with both a container and a cone. CONSTITUTION:The container 1 is made of porcelain and open at one end and has a through hole 1a in the other end. The insulating cone 4 is inserted into the through hole 1a so that the flange 4a of the cone faces the inside surface of the container 1. The cone 4 is fixed with the gasket 5 on the container by a bonding agent 10. The insulating cone 4 is fitted with a terminal 3 and an airtightly coated lead wire 2. The container 1 is fitted with a metal lid 9 so that a gasket 8 is in pressural contact with the container and the lid. The terminal 3 and an arrester body 7 are brought into pressural contact with each other by a coiled spring 6. The former gasket 5 is thus brought into pressural contact with the container 1 and the cone 4 by the force of the spring 6. Therefore, the airtightness of the arrester is not affected by the vibration of the lead wire 2, the construction of the arrester is simplified and its reliability is raised.

54. 发明专利

JPS5466443A EARTH TANK TYPE ARRESTOR 失效
公开(公告)号：JPS5466443A
公开(公告)日：1979-05-29
申请号：JP13379377
申请日：1977-11-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： IMATAKI MITSUMASA , UJITA TSUYOSHI
IPC分类号： G01R31/00 , H01C7/12 , H01C8/04 , H01T1/12 , H01T4/02 , H01T4/20 , H01T15/00
摘要： PURPOSE:To detect deterioratin of arrestor with high accuracy by increasing the voltage distribution of sintered metal oxide non-linear resistor groups toward the ground. CONSTITUTION:In the arrestor using a sintered metal oxide (zinc oxide, etc.) nonlinear resistors, housed in an earthing metal conainer, assuming the voltage share of the resistor element groups to be V1, V2, V3, ...., the voltage distribution is made to be greater toward the ground in the way, V6 V1 V2 V3 V4 V5, by selecting properly the values of impedance, Z1-1, Z1-2........Z1-n. Thus, greater stress always imparts on the V6 element group than on the other element groups, thus serving as monitor for the detection of zinc oxide element deterioration.

55. 发明专利

JPS5344849A INTERNAL SHORT CIRCUIT FAULT DETECTOR FOR EARTHED METALIC VESSEL TYPE POWER USE SWITCHING INSTRUMENT 失效
公开(公告)号：JPS5344849A
公开(公告)日：1978-04-22
申请号：JP11972376
申请日：1976-10-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： TAKAHASHI KOUJI , IDA YOSHIAKI , IMATAKI MITSUMASA
IPC分类号： H02H7/22
摘要： PURPOSE:To surely detect the short circuit faults from the exterior by arranging a current transformer in the connected portion of a plurality of earth metalic vessels and by detecting the difference of the current flowing through the respective current transformers in the event any short circuit fault may be caused in the vessels.

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