摘要 :
This report describes work done from May through December, 1976 on the Repetitive Series Interrupter, a hydrogen thyratron modified for switch-opening operation. Parametric studies of tube behavior, particularly of tube voltage dr...
展开
This report describes work done from May through December, 1976 on the Repetitive Series Interrupter, a hydrogen thyratron modified for switch-opening operation. Parametric studies of tube behavior, particularly of tube voltage drop and current-quenching requirements, are given, with further notes of tube performance and operational characteristics. Experimental modifications are mentioned and proposed continuations of work are discussed. (Author)
收起
摘要 :
This test and evaluation covers the final version of a Navy-designed portable ground fault interrupter. Testing included manual and drawings review, bench testing, and environmental testing. The first article of the production ver...
展开
This test and evaluation covers the final version of a Navy-designed portable ground fault interrupter. Testing included manual and drawings review, bench testing, and environmental testing. The first article of the production version was tested in accordance with the sections of MIL-STD-810E that present conditions under which this equipment will be operated. The result of this testing and evaluation is a recommendation for Authorized for Navy Use status.
收起
摘要 :
Despite their many advantages and their wide use in distribution systems, vacuum interrupters have been too limited in current and voltage for application on today's transmission systems. The goal of the present investigation is t...
展开
Despite their many advantages and their wide use in distribution systems, vacuum interrupters have been too limited in current and voltage for application on today's transmission systems. The goal of the present investigation is to assess the feasibility of designing and building a vacuum interrupter for such application;to specifically develop a vacuum interrupter with a voltage capability in the 72-80 kV range and a current capability in the 63-80 kA range with a continuous current rating of 3000 A.
To implement this undertaking, analytical and experimental work was carried out in four major problem areas: arc physics;vacuum breakdown;mechanical problems;interrupter fabrication and test.
The leading concept is that of the diffuse vacuum arc, particularly as embodied in electrode structures of rod array type;structures which are capable of carrying very large arcing currents without suffering damage. Corollary to the diffuse arc concept is that of arc transfer from the butt contacts to the fixed-gap diffuse arc structure and the separation of functions which this allows.
收起
摘要 :
The objective of the effort is to obtain an improved exploratory development model of the 15 kilovolts series interrupter. Designs of experimental devices, based on hydrogen thyratron techniques, are described. A test circuit has ...
展开
The objective of the effort is to obtain an improved exploratory development model of the 15 kilovolts series interrupter. Designs of experimental devices, based on hydrogen thyratron techniques, are described. A test circuit has been constructed, and the test results obtained to date are discussed.
收起
摘要 :
A fully operational current limiter system has been developed, laboratory and field tested. It is rated 15kV, 1000 Ampere, 15kA peak let-thru current on a 40kA(RMS sym) prospective fault. The underlying principle is the current li...
展开
A fully operational current limiter system has been developed, laboratory and field tested. It is rated 15kV, 1000 Ampere, 15kA peak let-thru current on a 40kA(RMS sym) prospective fault. The underlying principle is the current limiting protector (CLP) consisting of a pyrotechnically operated current limiting interrupter and a fault current level sensing and triggering circuit per phase.
The development effort resulted in consistent manufacturing processes for reliable CLP systems. Thus an epoxy cast body was produced with tight tolerances necessary to match the precisely machined main conductor of the CLP, to locate the pyrotechnic charges, and to accept the parallel current limiting fusible elements.
收起
摘要 :
Further development of the Repetitive Series Interrupter thyratrons is described. A series of tubes containing magnetic interaction regions with chuted wall internal surfaces has been designed and is under construction. Efforts to...
展开
Further development of the Repetitive Series Interrupter thyratrons is described. A series of tubes containing magnetic interaction regions with chuted wall internal surfaces has been designed and is under construction. Efforts to eliminate restrike continue with the study of grid biasing and anode-grid region magnetic field pulsing. Alternate interruption geometries are tested. (Author)
收起
摘要 :
Further development of the Repetitive Series Interrupter, a hydrogen thyratron modified for opening-switch operation, is described. Deuterium is rejected as an alternative fill gas because of increased interrupting magnetic field ...
展开
Further development of the Repetitive Series Interrupter, a hydrogen thyratron modified for opening-switch operation, is described. Deuterium is rejected as an alternative fill gas because of increased interrupting magnetic field requirements due to the greater inertial resistance of the heavier positive ions to the magnetic field-induced transverse diffusion. Modified magnetic field pulse shapes are explored, and an analysis of a positive column of weakly ionized hydrogen gas in a transverse magnetic field is presented. (Author)
收起
摘要 :
Research has shown that different types of interruptions can affect their disruptiveness. However, it is unclear how different features of the interrupting task determine its disruptive effects. Specifically, some theories predict...
展开
Research has shown that different types of interruptions can affect their disruptiveness. However, it is unclear how different features of the interrupting task determine its disruptive effects. Specifically, some theories predict that the difficulty of an interruption does not contribute to the disruptive effects of that interruption alone. Disruptive effects can be mediated by the extent to which the interrupting task interferes with the ability to rehearse during the interruption. In this experiment participants performed a single primary task with three interruptions of different difficulty. We found that interruptions were more disruptive when the task minimized the participant's ability to rehearse (as measured by the number of mental operators required to perform the task) and not just when they were more difficult. These results suggest that the ability to rehearse during an interruption is critical in facilitating resumption of a primary task.
收起
摘要 :
Single-server queues in which the server takes vacations arise naturally as models for a wide range of computer-, communication-, and production-systems. In almost all studies on vacation models, the vacation lengths are assumed t...
展开
Single-server queues in which the server takes vacations arise naturally as models for a wide range of computer-, communication-, and production-systems. In almost all studies on vacation models, the vacation lengths are assumed to be independent of the arrival, service, workload and queue length processes. In the present study we allow the length of a vacation to depend on the length of the previous active period, i.e., the period since the previous vacation. Under rather general assumptions regarding the offered work during active periods and vacations, we determine the steady-state workload distribution. We conclude by discussing several special cases including polling models, and relate our findings to results obtained earlier.
收起
