Aprēķins:
l1 = 1,0 mm
d = 1,0 + 0,N = 1,0 + 0,1 = 1,1 mm
tm = 0,1 + M = 0,1 + 0 = 0,10 s
tp = 0,30 + N = 0,30 + 0,01 = 0,31 s
S = (π* d^2)/4 = (3,14*〖1,1〗^2*10^(-6))/(4 ) = 9,4985 * 10-7 m2
l = 2l1 = 2 * 1,0 * 10-3 = 2 * 10-3 m
V = l * S = 2 * 9,4985 * 10-10 = 1,8997 * 10-9 m2
m = γ*V= (7,9 *1000) * (1,8997 * 10-9) = 1,50076 * 10-5 kg
Q = Pd * tm = cm (k - 0) = 0,12 * 4,187 * 103 * 1,50076 * 10-5 * (1400 – 20) = 10,40578 J
Pd = Q/t_m = 10,41/0,1 = 104,1 W
Transformatora aktīvā jauda
Ptr = P_d/ղ* t_m/(t_m+ t_p )= (104,1*0,1)/(0,5*(0,1+0,31) )=50,78048 W
Drošinātāja strāva
I1 = P_tr/U_1 = 50,78/380 = 0,133632 A
R0 = ρ l/s= ρ 4l/(π* d^2 )= (0,15*10^(-6)*4* 2* 10^(-3))/(3,14* 〖1,1〗^2* 10^(-6) )= 0,315839*10-3 Ω
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