loss angle

loss angle

[′lȯs ‚aŋ·gəl]
(electromagnetism)
A measure of the power loss in an inductor or a capacitor, equal to the amount by which the angle between the phasors denoting voltage and current across the inductor or capacitor differs from 90°.
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Request for quotations : the system for determining the electrical capacitance and the tangent of dielectric loss angle at a frequency of 1 mhz in the configuration according to the technical task (appendix no.
The analysis of the loss angle leads to information on the content of branched [23-25] and gel-like moieties [25-27].
According to international and national Standards [1, 8, 9], when conducting periodic tests of the state of insulation of high-voltage bushings, the values of the following indicators are monitored: dielectric loss angle tangent of main insulation (tg[[delta].sub.1]), main insulation capacitance ([C.sub.1]), dielectric loss angle tangent of measuring capacitor (tg[[delta].sub.2]), capacitance of measuring capacitor ([C.sub.2]), and the insulation resistance of the output to measure (R).
Higher value for the loss angle indicates a high deg- ree of contamination.
The complement of angle between voltage and current vectors is called dielectric loss of angle [delta] or dielectric loss angle. The tangent of this angle [delta] provides an indication of losses in insulation and is known as Power factor or Dielectric Dissipation factor.
The phase angle [theta] is the angle between the Z vector and Z1 and the loss angle [delta] is the angle between Z" and the Z vector, where the dielectric loss tangent tan 8 is given by the relation:
Tan delta, also called loss angle or dissipation factor testing, is a diagnostic method of dielectrics to determine the quality of the insulation.
1A and 1B, respectively) as well as the capacitance of a capacitor with specimens representing its dielectric and the corresponding values of tangens of the loss angle (Fig.
compound properties Properties on part Rubber compound properties Stiffness (deformation under stress) Modulus Damping at low frequency High loss angle Low stiffening at high frequency Low loss angle Fatigue life Tear strength Resistance to cut increase Adhesion to metal Adhesion to metal Durability Aging resistance ([O.sub.2], [O.sub.3]) Creep resistance Compression set Table 2--MRPRA EDS 12 formulation Natural rubber 100 Zinc oxide 3.5 Stearic acid 2 Carbon black 45 Processing oil 5 Antioxidant paraphenylene diamine 2 Wax Sulfur 2.5 Sulfenamide (CBS) 0.7 Table 3--MRPRA EDS 12 properties Hardness ISO 27 (IRHD) 60 Tensile strength (ASTM D 412-87) 25 MPa Elongation at break (ASTM D 412-87) 590% Compression set 22 h.
[Epsilon]' = Re{Epsilon.sub.r} [Epsilon]" = Im{Epsilon.sub.r} = [Epsilon]' tan [Delta] [Delta] = dielectric loss angle [Epsilon]" = dielectric loss factor
where [U.sub.f] is the phase voltage, [omega] is the angular frequency, C--is the own capacitance of wire, tg [delta] is the tangent of the dielectric loss angle of insulation.
The tangent of dielectric loss angle can be evaluated using the relation given as,