On the definitions of practical permittivity and dielectric loss angle

✍ Scribed by Shi-Liang Wang

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 489 KB
• Volume: 326
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(89)90072-0

✦ Synopsis

The absolute permittivity i consists of practical permittivity .QE: and dielectric dissipation factor tan 6. Practical relative permittivity E: is equal to the parallel dielectric coeficient cp, series dielectric coeficient E, is only a transitional form of sp and only when E, is transformed into &p = &,/(I + tan' 6) will it become the practical relative permittivity. The dielectric loss angle 6 is the angle by which actual current vector i lags behind capacitance current vector 1, in electrical engineering ; 6 is the angle by which electrical Jlux density vector b lags behind electric field strength vector I? in the theory of electromagnetic field. Both of them are the complementary angle of the admittance angle (6 = 42-4, 4 being the admittance angle). This definition of the loss angle (6 = 42-4) is a result of the unzfying admittance calculation. This result reflects an objective need and is helpful in the establishment of the equation for the phase angle equilibrium of the bridge. Hence it should be a proper or definite place in the International Electrotechnical Vocabulary (IEV) -212 draft of the International Electrotechnical Commission (IEC).