公开(公告)号：US4083028A

公开(公告)日：1978-04-04

申请号：US640916

申请日：1975-12-15

申请人： Harold D. Haubein ,  George D. Allen ,  Robert W. Harmon ,  Edgar J. Ramsey, Jr. ,  Ronald C. Pehle

发明人： Harold D. Haubein ,  George D. Allen ,  Robert W. Harmon ,  Edgar J. Ramsey, Jr. ,  Ronald C. Pehle

IPC分类号： H01H85/46 ,  H01H85/54 ,  H02B11/26 ,  H01H71/20

CPC分类号： H02B11/26 ,  H01H85/46 ,  H01H85/542

摘要： Pad-mounted double-fused switchgear especially adapted for use in underground distribution systems is provided which includes an oil tank having manually operable vacuum switch apparatus therein in conjunction with closely adjacent, series-connected, combination current limiting fuse-expulsion link protective fuse structure for maintaining the required momentary electrical rating of the overall switch apparatus notwithstanding of a relatively low-rated switch element, and for providing thermal protection for the switchgear. Double-fusing within the oil tank also serves to reduce electrical duty on upstream and downstream equipment, increases the interruption rating of the switchgear, and enhances overall system coordination. In preferred forms the expulsion link is temperature sensitive and is constructed to actuate only at relatively low fault current levels while remaining intact during high-level faults which actuate the backup current limiting fuse; in this manner effective total range fuse protection is maintained and the extent of attendant oil contamination is lessened since the expulsion link operates only during low level fault-clearing situations. Novel fuse well-double fuse assemblies adapted for use with pad-mounted electrical apparatus are also disclosed, along with structure for selectively holding the tank lid of such apparatus open against inadvertent closing thereof which can occur during high wind conditions.

公开(公告)号：US4870387A

公开(公告)日：1989-09-26

申请号：US170031

申请日：1988-03-21

申请人： Robert W. Harmon

发明人： Robert W. Harmon

IPC分类号： H01B17/42 ,  H01H31/02 ,  H01H31/12

CPC分类号： H01H31/127 ,  H01B17/42 ,  H01H31/023

摘要： An improved, integrally cast, synthetic resin insulator (22) especially adapted for use in an electrical cutout device (20) is provided which can be readily fabricated and gives greatly enhanced beam strength and arc track resistance characteristics. The preferred insulator (22) is cast using an epoxy resin such as bisphenol A filled with a relatively large quantity of glass beads and hydrated alumina. The filler fraction contributes to lowered viscosity, deaerability and improved settling properties while the resin is in an uncured state, and moreover enhances the arc track resistance and mechanical strength of the resin system after curing. The preferred insulator (22) is cast to present a longitudinal bow giving the insulator (22) an arcuate central axis. Further, the periphery of the insulator (22) is formed with a series of superposed, generally oval-shaped in cross-section, outwardly flaring skirts (30) interconnected by smooth transition regions (32) free of stress-inducing sharp corners. By virtue of the oval-shaped skirts (32), the insulator (22) has a greater effective width than thickness, thus maximizing the beam strength of the insulator (22).

摘要翻译： 提供了一种特别适用于电气切断装置（20）的改进的整体铸造的合成树脂绝缘体（22），其可以容易地制造并且提供大大增强的束强度和电弧轨道阻力特性。 优选的绝缘体（22）使用填充有相对大量的玻璃珠和水合氧化铝的环氧树脂如双酚A进行浇铸。 当树脂处于未固化状态时，填料部分有助于降低粘度，脱气性和改善的沉降性能，并且还提高了固化后的树脂体系的电弧轨迹抗力和机械强度。 优选的绝缘体（22）被铸造以呈现给予绝缘体（22）的弓形中心轴线的纵向弓形。 此外，绝缘体（22）的周边形成有一系列重叠的大致椭圆形的横截面，通过没有应力引起的尖角的平滑过渡区域（32）互连的向外扩张的裙部（30）。 由于椭圆形裙部（32），绝缘体（22）具有比厚度更大的有效宽度，从而使绝缘体（22）的束强度最大化。

公开(公告)号：USD314744S

公开(公告)日：1991-02-19

申请号：US510406

申请日：1990-04-17

申请人： Robert W. Harmon

设计人： Robert W. Harmon

公开(公告)号：USD310062S

公开(公告)日：1990-08-21

申请号：US113726

申请日：1987-10-28

申请人： Robert W. Harmon

设计人： Robert W. Harmon

公开(公告)号：US4281228A

公开(公告)日：1981-07-28

申请号：US25903

申请日：1979-04-02

申请人： Robert W. Harmon

发明人： Robert W. Harmon

IPC分类号： H01H33/12 ,  H01H33/66 ,  H01H33/666 ,  H01R11/14 ,  H01H3/54 ,  H01H9/16 ,  H01H9/30

CPC分类号： H01H33/666 ,  H01H33/121 ,  H01R11/14 ,  H01H2009/0292 ,  H01H2300/058 ,  H01H33/6661

摘要： A portable tool for making and breaking high magnitude load currents is provided which is reliable in operation, can be used in applications lacking mechanical switching or cutout apparatus, and provides a secondary, visual assurance to the user when a load is broken. The device preferably includes a pair of vacuum bottle-enclosed, load-making and -breaking contacts, along with a series-connected pair of visually observable contacts exteriorly of the vacuum bottle. Spring-biased operating mechanism assures that the bottle-enclosed contacts actually make and break the load current during use of the tool, while the secondary contacts are operated in sequenced relationship to the make and break contacts. When the device is used to break a current load, transparent portions of the tubular walls of the device permit the user to visually perceive a large open air gap between the secondary contacts.

摘要翻译： 提供了一种用于制造和分断大幅度负载电流的便携式工具，其操作可靠，可用于缺少机械切换或切割装置的应用中，并且当负载断裂时为用户提供次要的，可视化的保证。 该装置优选地包括一对真空瓶封闭的装载制造和断裂触点，以及在真空瓶外部的串联连接的可视可触摸的触点。 弹簧偏压的操作机构确保瓶子接触件在使用工具期间实际上产生和破坏负载电流，而次级触点以与制动和断开触点的顺序关系操作。 当该装置用于破坏当前负载时，该装置的管状壁的透明部分允许使用者在第二触点之间目视感知大的敞开气隙。