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Home All issues Volume 80 (2025) Sci. Tech. Energ. Transition, 80 (2025) 32 Full HTML

Table 6

Best-fit distribution for components using TBF and TTR data.

Sr. No. Subsystem Best fit distribution with parameters (for TBF) Best fit distribution with parameters (for TTR) MTBF (h) MTTR (h)
1 Earthing and Grounding Weibull 3P: Beta = 0.67; Eta (h) = 154.5; Gamma (h) = 21.76 Normal: Mean (h) = 1.66; Std (h) = 0.99 225.20 1.66
2 DC combiner box 2P Weibull: Beta = 0.98; Eta (h) = 467.39 2P Weibull: Beta = 1.34; Eta (h) =  0.93 470.82 0.85
3 Insulated-gate bipolar transistor 2P Exponential: Mean Time (h) = 7.38; Gamma (h) = 20.02 2P Exp: Mean Time (h) = 0.90; Gamma (h) = 0.25 27.40 1.15
4 Fuse connect/Fuse Normal: Mean (h) = 16,804; Std (h) = 12,403.9 2P Weibull: Beta = 0.84; Eta (h) = 3.06 16,804 3.36
5 DC link 1P Exponential: Mean Time (h) = 17,463.54 2P Weibull: Beta = 0.96; Eta (h) = 1.77 17,464 1.80
6 Cooling fan 1P Exponential 3P Weibull: Beta = 4.69; Eta (h) = 10.26; Gamma (h) = 0.004 24 9.39
7 Transformer Weibull 3P: Beta = 0.30; Eta (h) = 2513; Gamma (h) = 23.62 2P Exponential: Mean Time (h) = 5.1; Gamma (h) = 0.24 23,211 5.33
8 AC combiner box 2P Exponential: Mean Time (h) = 28; Gamma (h) = 15.74 Normal: Mean (h) = 1.83; Std (h) = 0.81 43.74 1.83
9 SMBUS Communication Lognormal Log-Mean (h) = 6.25; Log-Std = 2.84 Lognormal: Log-Mean (h) = 0.62; Log-Std = 0.56 9.69 2.18
10 Grid Weibull 3P: Beta = 0.53; Eta (h) = 57.68; Gamma (h) = 22.96 Normal: Mean (h) = 1.09; Std (h) = 0.45 128.55 1.09
11 AC Converter 3P Weibull: Beta = 0.36; Eta (h) = 19.63; Gamma (h) = 23.5 2P Exponential: Mean Time (h) = 0.05; Gamma (h) = 0.15 117.16 0.20
12 Connector 2P Weibull: Beta = 0.59; Eta (h) = 11,685 3P Weibull: Beta = 0.98; Eta (h) = 0.48; Gamma (h) = 0.04 57,731 0.53
13 Relay 1P Exponential 2P Weibull: Beta = 18.22; Eta (h) = 12.06 24 11.72
14 Inverter 3P Weibull: Beta = 0.41; Eta (h) = 109; Gamma (h) = 22.42 3P Weibull: Beta = 1.22; Eta (h) = 0.13; Gamma (h) = 0.15 354.36 0.27

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