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  • BSI
    BS 7663:1993 Methods of test for determination of permittivity and dissipation factor of electrical insulating material in sheet or tubular form
    Edition: 1993
    $315.02
    / user per year

Description of BS 7663:1993 1993

This British Standard describes three methods for the measurement of permittivity and of dissipation factor of electrical insulating materials in the form of sheets or rigid circular tubes at frequencies between 50 Hz and 1 MHz, under normal ambient temperatures and conditions. The methods described are applicable to sheet materials in the thickness range 0.3 mm to 5.0 mm and for tubes at least 75 mm long.

The methods are:

  • an air substitution method, commonly called the “Lynch” method (method A)
  • a two fluid immersion method (method B)
  • a single fluid immersion method (method C).

Methods A and B are suitable for materials of permittivity up to 10.0. For materials of dissipation factor below 250 × 10–6 the precision achieved by these methods may not be acceptable.

Method A requires accurate knowledge of the specimen thickness and should be used in all cases when this information is available. If the thickness is not accurately known, methods B or C may be used subject to the limitation that method C is suitable for materials for which a liquid matching its permittivity to within 0.1 is available. Method C is suitable for measurement of polyolefin sheets whose permittivity sufficiently closely matches that of silicone oil of kinematic viscosity of 1 cSt to 2 cSt1).

Methods B and C are not suitable for materials with an open cell structure.

Method B is suitable for measurements on straight cylindrical tubes of circular cross section.



Three methods are described at frequencies between 50 Hz and 1 MHz.

Standard NumberBS 7663:1993
TitleMethods of test for determination of permittivity and dissipation factor of electrical insulating material in sheet or tubular form
StatusConfirmed
Publication Date1993-07-15
ReplacesBS 903-C3:1982
DescriptorsDissipation factor, Test equipment, Pipes, Electrical measurement, Rigid pipes, Thickness, Testing conditions, Dielectric measurement, Electrical testing, Sheet materials, Solid electrical insulating materials, Test specimens, Permittivity measurement, Thickness measurement, Electrical insulating materials
ICS29.035.01 Insulating materials in general
CommitteePRI/22
ISBN0 580 21798 1
PublisherBSI
Pages18



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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