1967 Seventh Electrical Insulation Conference

book

1967 Seventh Electrical Insulation Conference

IEEE

chapter

The development of a cable insulation

C. F. Wallace, G. W. Sargent

1967 Seventh Electrical Insulation Conference > 291 - 293

1967 Seventh Electrical Insulation Conference

The rapid pace of our changing society results in continued demands for new or improved insulations. To meet these demands, insulation formulations must be revised, and occasionally entirely new insulations are needed to fit a particular application. Development of such new or revised insulations requires a high degree of skill and creativity. The obvious goal is a balance of the many properties required...

chapter

Enamel insulated aluminum foil conductor

E. J. Croop, D. C. Westervelt, W. S. Gorton

1967 Seventh Electrical Insulation Conference > 288 - 290

1967 Seventh Electrical Insulation Conference

Insulated aluminum foil has proved itself superior to round and rectangular copper wire for conductors in electrical coils such as are used in distribution transformers because of its desirable electrical and thermal characteristics as well as decided economic advantages. This paper traces the development of an enamel insulating process for aluminum foil from the initial R&D laboratory work, through...

chapter

A dynamic test procedure for the evaluation of magnet wire insulation systems used in windings of electronic transformers having crossed turns

L. W. Kirkwood

1967 Seventh Electrical Insulation Conference > 239 - 240

1967 Seventh Electrical Insulation Conference

The test procedure discussed in this paper is considered to be a dynamic test of magnet wire insulation systems since the test specimens are subjected to the same environments that the products would experience during production. It was developed to make a quick test involving a number of variables so as to make a value judgment with confidence. The various NEMA standards for enameled or film insulated...

chapter

A method of evaluating insulation systems for universal motors used to power portable tools

Henry Klein, Alexander C. Wilson

1967 Seventh Electrical Insulation Conference > 134 - 136

1967 Seventh Electrical Insulation Conference

The requirement for the optimum portable electric tool motor is that it produces extremely high power output for its weight and size and that it holds up under the normal and abusive operation to which it is subjected during its expected life. To obtain the ultimate in this respect, full advantage must be taken of all applicable advancements in the state of the art. Widespread use has been made of...

chapter

Extension of test range in the IEC test for tracking resistance

F. Noto, A. Aoike, K. Kawamura

1967 Seventh Electrical Insulation Conference > 115 - 117

1967 Seventh Electrical Insulation Conference

The testing methods for measuring the tracking resistance of organic insulators using drops of electrolytic solution such as the IEC recommended test^1,2 and the DIN test^3,4 have some merits; the test device is simple and the test procedure is comparatively easy. However, in the IEC test, test voltages above 500V or 600V cannot be applied because at the higher voltages an arc bridges the electrodes...

chapter

Recent research on tracking of electrical insulation

J. L. Douglas, R. M. Scarisbrick

1967 Seventh Electrical Insulation Conference > 118 - 122

1967 Seventh Electrical Insulation Conference

Before about 1930, tracking was used to describe a form of surface degradation of electrical insulation due to rubbing contacts, such as brushes, but from that date onwards the term gradually became associated with the formation of a conducting carbonized path caused by the combination of electrical stress and surface contamination. For the purpose of this paper, tracking is defined as "the decomposition...

chapter

Designing motors for integral insulation

Elmer T. Strong

1967 Seventh Electrical Insulation Conference > 140

1967 Seventh Electrical Insulation Conference

In 1966, for the first time, the value of motors and small generators surpassed $1 billion. In 1964, only two years earlier, the comparative figure was approximately $731 million.

chapter

Conductive polymers

J. H. Lupinski

1967 Seventh Electrical Insulation Conference > 131

1967 Seventh Electrical Insulation Conference

There appears to be a steady increase in the number of publications dealing with the electronic properties of organic solids in general. Conductive polymers are of particular interest since they are expected to have better mechanical properties, and are thus more suitable for technical applications, than the monomeric conducting organic materials which are mainly micro crystalline or amorphous solids.

chapter

Polyethylene as a high voltage cable insulation

P. H. Ware

1967 Seventh Electrical Insulation Conference > 255 - 257

1967 Seventh Electrical Insulation Conference

In 1894 the first oil-impregnated paper-insulated lead-sheathed cable was used for high-voltage power transmission in the United States. For approximately fifty years no serious challenger appeared on the scene, and even at present, more than seventy years later, paper-insulated cable is still very much in use for all voltages from 15 kv up, and in one form or another is the only insulation used commercially...

chapter

Voltage endurance of electrical insulation

H. Meyer

1967 Seventh Electrical Insulation Conference > 268 - 271

1967 Seventh Electrical Insulation Conference

Short time dc- or ac-tests are carried out on insulation in order to eliminate weak spots which otherwise would fail under service conditions. The normal electric stress in service is a low ac-voltage. In addition momentary increases of this ac-voltage, transient oscillatory and unipolar voltages must be taken into consideration.

chapter

“Student prize paper”: The effects of hydrostatic pressure on the gas accumulation following a single spark discharge in a liquid dielectric

John F. Laycak

1967 Seventh Electrical Insulation Conference > 277 - 280

1967 Seventh Electrical Insulation Conference

Immediately following the breakdown of a liquid dielectric a variety of dynamic events appear. Initially, a highly luminescent, thin, plasma column is formed followed by a radially expanding mechanical shock wave. In the process, a gaseous bubble composed of vaporized dielectric is created. The study described here is concerned with this bubble. Specifically, investigations were made into the effects...

chapter

Wire and cable developments applicable to antennas

D. V. Rosato

1967 Seventh Electrical Insulation Conference > 170 - 174

1967 Seventh Electrical Insulation Conference

The past few years have started to show more major imaginative engineering changes and have continued to set the pace for product developments in electrical insulation and jacketing for wire and cable. Power and communication lines in different sizes and forms have evolved to meet the continuing new electrical and electronic requirements, such as miniaturization in coaxial cables. As expected, bottlenecks...

chapter

Factors affecting stability of transformer and cable oils

J. J. Melchiore, I. W. Mills

1967 Seventh Electrical Insulation Conference > 159 - 162

1967 Seventh Electrical Insulation Conference

As part of our efforts to produce better electrical insulating fluids, we are trying to understand the mechanism of dielectric loss in these fluids. We believe such an understanding, will lead to better insulating fluids and more efficient petroleum refining processes.

chapter

Testing of insulation for moisture resistance in a motor under operational stress

R. D. Petry

1967 Seventh Electrical Insulation Conference > 144

1967 Seventh Electrical Insulation Conference

Continuous advances in rotating equipment design are placing greater demands on electrical insulations. The conditions under which magnet wire operates have been changing. In some cases, this has resulted from the removal of phase insulation, reduction in magnet wire build or the use of high temperature film insulated magnet wire with low temperature ground insulation. Operating temperatures, overload...

chapter

Application of insulating materials for double insulated portable electric tools

Leonard C. Pratt

1967 Seventh Electrical Insulation Conference > 145 - 147

1967 Seventh Electrical Insulation Conference

The selection and application of insulating materials is vital to the design of a double insulated (DI) tool to make it as safe as a properly grounded one.

chapter

The significance of the density of transformer oils

V. R. Mulhall, H. E. Thompson

1967 Seventh Electrical Insulation Conference > 156 - 158

1967 Seventh Electrical Insulation Conference

In North America, the density, or the specific gravity of mineral insulating oils, has traditionally been considered to be of no significance in establishing the suitability of the oil for specific applications, but has only been of value to the purchaser in signalling any drastic change in the base crude stock from which the oil was refined.

chapter

A survey of turn insulation on large AC motors

R. M. Sexton

1967 Seventh Electrical Insulation Conference > 71 - 72

1967 Seventh Electrical Insulation Conference

AC motors and generators with ratings in the range of 500 kW or more generally use form wound coils consisting of multiple turns of rectangular copper conductors. This type of machine over the years has established a very high level of reliability, but, of course, there are some failures and since these invariably involve important applications, they are of concern.

chapter

An evaluation of creepage requirements for electric motors

W. G. Stiffler, James S. Bowers

1967 Seventh Electrical Insulation Conference > 65 - 67

1967 Seventh Electrical Insulation Conference

While tremendous advances in dielectric materials for ground insulation and turn insulation have been made in recent years, little thought has been given to creepage requirements. Creepage "requirements" seemed adequately defined in 1913 when Gray stated: "To prevent breakdown of the end connection insulation due to this cause (ionization of the air over the slot insulation extension),...

chapter

Ceramic-polymer composite dielectric film for capacitors

W. Nowak, A. Siitasel

1967 Seventh Electrical Insulation Conference > 43 - 45

1967 Seventh Electrical Insulation Conference

The purpose of the work reported here is development of a new type dielectric that could lead to improved energy storage and other foil-type capacitors of higher volumetric efficiency than metallized film units presently being manufactured.

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1967 Seventh Electrical Insulation Conference