2, 3 show the frequency dependences of the capacitance and tangent of the dielectric loss angle of the hull insulation system of the ITM windings, constructed on the basis of (2), (3).
3 curves 1-3 are constructed under the assumption: curve 1--with a constant value of tg[delta] of thermosetting composite insulation; 2 and 3--with the power law of change of the tangent of the dielectric loss angle of insulation: 2--at tg[delta] = tg[[delta].
Thus, when monitoring the capacitance and tangent of the dielectric loss angle tg[delta] of the hull insulation system at frequency of 10 kHz (above resonant), the readings of the immittance meter become negative: C = -2.
For the tangent of the dielectric loss angle, the more pronounced frequency dependence [r.
Dynamics of changes in partial capacitances and tangent of the dielectric loss angle in the process of accelerated aging under conditions of high humidity and temperature
Table 1 Coefficients of mutual pair correlation between the capacitance in the initial state and the capacity after accelerated aging (rC), between the tangent of the dielectric loss angle in the initial state and after accelerated aging (rtgS) Frequency of Conditions of accelerated aging measurements 336 hours 1440 hours 206 hours 456 hours f, kHz under At normal of heat of heat conditions conditions aging at aging at of 100 % temperature temperature humidity 90[degrees]C 90[degrees]C [r.