Temperature Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors: From Ground Level to Cruising Altitude

Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures

“…The model relies on the fitting parameter 𝐾 , representing the natural logarithm of the critical electron count that defines the transition from Townsend to streamer discharges in the context of SCSIC. Previous SCSIC research, including [7], [8], [9], and [10], centred on modeling at a fixed H level. However, given the importance of motor insulation reliability under varying environmental conditions, this paper comprehensively explores PDIV modeling and PD phenomena across a broad range of Ts and H levels to achieve a PD-free design.…”

“…The insulated wire characteristics are listed in Table I. The method for measuring copper wire diameter, insulation thickness, and 𝜀 r is detailed in [10]. To manufacture TPs, wires are twisted 12 times with a 7 N load tension, resulting in a 125 mm twisted section [12].…”

“…To determine 𝐾 , the initial requirements involve: a) conducting electric field distribution simulations to derive FLLs in the air wedge and electric field intensity along each FL, and b) calculating 𝛼 eff as a function of electric field intensity. For detailed methods regarding the derivation of FLLs, electric field magnitude, and 𝛼 eff , refer to [9], [10], [11]. The algorithm outlined in [8], [9], [10] and [11] is developed and coded in MATLAB to determine the 𝐾 value under B10 of PDIV across various H levels and Ts.…”

“…For detailed methods regarding the derivation of FLLs, electric field magnitude, and 𝛼 eff , refer to [9], [10], [11]. The algorithm outlined in [8], [9], [10] and [11] is developed and coded in MATLAB to determine the 𝐾 value under B10 of PDIV across various H levels and Ts.…”

“…For brevity, the main steps in the calculation are listed below [9], [10] and [11]: 1) Import the reference database from FEM electrostatic computations at a unit voltage (i.e., 1 V), including FLLs vs. electric field intensity (see Fig. 3).…”