Medium loss angle δ
Under the action of alternating electric field, the angle between the current phase amount flowing through the dielectric, the angle δ of the power factor angle φ ). Abbreviation the die loss angle.
Medium loss positive cutting value TGδ
is also known as the medium loss factor, refers to the tangent value of the medium loss angle, referred to as the die loss angle. The definition of the medium loss is as follows:
If the current phase amount and voltage phase of the test product can be obtained, the following phase quantities can be obtained: the total current can be decomposed into capacitive current IC and resistance current IR synthesis, so : This is the positive cut value of the imperfect value Δ = (90 ° -φ). The current digital instrument is essentially, and is the measurement factor by measuring δ or φ. Measuremental relationships to judge the insulation condition of the electrical equipment is a traditional, very effective way. The decline in insulation capacity is directly reflected in the increase in die. Further, the reasons for the decline in insulation, such as: insulation, insulating oil is contaminated, aging deterioration, etc. The capacitance of the sample can also be obtained while measuring the die. If one or more of the plurality of capacitive screens, there is a significant change in the circuit, the circuit, and the capacitance is significant, so the capacitance is also an important parameter. 4, the power factor COSφ power factor is the cosine value of the power factor angle φ, meaning is the specific gravity of the total active power P in power S in power S. The definition of the power factor is as follows: Some impaired tester habits Displays power factor (PF: cosφ), rather than media loss factors (DF: TGδ). General cosφ