“energo-mexanika” fakulteti

8) 6 kV li shina oraqali ta’minlanayotgan 3050 kVt dvigatelni kabel liniyasini tanlaymiz.


S=2875.6 kVA, U_n=6 kV, L= 224.38 m = 0.22438 km
a) Hisobiy tok


I_p = 2875.6 /(1,73 ^. 6)=277 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=277 /1,2=230.84 mm²

c) Kabel transheyada AASHv (3x240) tanlanadi

I_d.d=351 A; ΔP=120 kVt/km; K=152.867 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=277 / 351=0,78
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=152.867 ^. 0.22438 ^.1 = 34.300 mln. so‘m

f) Energiya isrofi

ΔW=120 ^. 0,78^{2 .} 1 ^. 0,22438=16.3 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=16.3 ^. 1962840=31.994 mln. so‘m / yil
6 kV li shinadan 6/0.4 kV ga tushirib beradigan transformatorga kabel tanlaymiz.
9) 6 kV li shina oraqali ta’minlanayotgan 3050 kVt dvigatelni kabel liniyasini tanlaymiz.


S=1000 kVA, U_n=6 kV, L= 106.1 m = 0.1061 km
a) Hisobiy tok


I_p = 1000 /(1,73 ^. 6)=96.3 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=96.3 /1,2=80.25 mm²

c) Kabel transheyada AASHv (3x95) tanlanadi

I_d.d=205 A; ΔP=50 kVt/km; K=59.345 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=96.3 / 205=0,47
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=59.345 ^. 0.1061 ^.1 = 6.296 mln. so‘m

f) Energiya isrofi

ΔW=50 ^. 0,47^{2 .} 1 ^. 0,1061=1.17 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=1.17 ^. 1962840=2.296 mln. so‘m / yil


10) 6 kV li shina oraqali ta’minlanayotgan 3050 kVt dvigatelni kabel liniyasini tanlaymiz.


S=1000 kVA, U_n=6 kV, L= 114.1 m = 0.1141 km
a) Hisobiy tok


I_p = 1000 /(1,73 ^. 6)=96.3 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=96.3 /1,2=80.25 mm²

c) Kabel transheyada AASHv (3x95) tanlanadi

I_d.d=205 A; ΔP=50 kVt/km; K=59.345 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=96.3 / 205=0,47
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=59.345 ^. 0.1141 ^.1 = 6.771 mln. so‘m

f) Energiya isrofi

ΔW=50 ^. 0,47^{2 .} 1 ^. 0,1141=1.26 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=1.26 ^. 1962840=2.473 mln. so‘m / yil


11) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 133.42 m = 0.13342 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²

c) Kabel transheyada ASB (3x150+1x95) tanlanadi

I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.13342 ^.1 = 21.311 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,13342=3.3 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.3 ^. 1962840=6.477 mln. so‘m / yil
12) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 133.42 m = 0.13342 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²

c) Kabel transheyada ASB (3x150+1x95) tanlanadi

I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.13342 ^.1 = 21.311 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,13342=3.3 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.3 ^. 1962840=6.477 mln. so‘m / yil


13) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 127.33 m = 0.12733 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²
c) Kabel transheyada ASB (3x150+1x95) tanlanadi


I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.12733 ^.1 = 20.338 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,12733=3.1 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.1 ^. 1962840=6.084 mln. so‘m / yil


14) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 127.33 m = 0.12733 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²
c) Kabel transheyada ASB (3x150+1x95) tanlanadi


I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.12733 ^.1 = 20.338 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,12733=3.1 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.1 ^. 1962840=6.084 mln. so‘m / yil
15) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 146.88 m = 0.14688 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²
c) Kabel transheyada ASB (3x150+1x95) tanlanadi


I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km

d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.14688 ^.1 = 23.461 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,14688=3.6 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.6 ^. 1962840=7.066 mln. so‘m / yil


16) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 146.88 m = 0.14688 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²
F=162.2 /1,2=135.17 mm²
c) Kabel transheyada ASB (3x150+1x95) tanlanadi


I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.14688 ^.1 = 23.461 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,14688=3.6 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.6 ^. 1962840=7.066 mln. so‘m / yil
17) 0.4 kV li shina oraqali ta’minlanayotgan 245 kVt dvigatelni kabel liniyasini tanlaymiz.


S=224.6 kVA, U_n=0.4 kV, L= 150.98 m = 0.15098 km
a) Hisobiy tok


I_p = 224.6 /(2^.1,73 ^. 0.4)=162.2 A
b) Kabelni ko‘ndalang kesim yuzasi , bunda j_e = 1,2 A/mm²


F=162.2 /1,2=135.17 mm²

c) Kabel transheyada ASB (3x150+1x95) tanlanadi

I_d.d=305 A; ΔP=88 kVt/km; K=159.731 mln. so‘m /km
d) Yuklama koeffitsienti

K₃=162.2 / 305=0,53
e) Kabelni narxi K`=K <sup>.</sup> L <sup>.</sup> n
K`=159.731^. 0.15098 ^.1 = 24.116 mln. so‘m

f) Energiya isrofi

ΔW=88 ^. 0,53^{2 .} 1 ^. 0,15098=3.7 kVt

g) Bir yil uchun elektr energiya isrofi narxi

U_PE=3.7 ^. 1962840=7.262 mln. so‘m / yil


Kabel liniyalar uchun texnik-iqtisodiy ko‘rsatkichlarni tanlash

Elektr ta’minotini loyihalashda texnik-iqtisodiy ko‘rsatkichlar elektr energiya bilan uzluksiz ta’minlashda va tejamkorlikda muhim ahamiyatga ega.

Texnik-iqtisodiy ko‘rsatkichlarni hisoblashda muhim ko‘rsatkichlardan materiallarni chiqimi, ya’ni elektr bilan ta’minlash inshootlarini kapital mablag‘i hisobga olinadi..
Boshqa ko‘rsatkichlariga: ekspluatatsiyaga chiqimlar, xizmat ko‘rsatishga va joriy xizmatga, shuningdek elektr bilan ta’minlashga chiqimlar kiradi..
Amortizatsiyaga chiqim quyidagi formula orqali aniqlanadi


U_a=K ^. E_a

Bu yerda E_a – amortizatsiyani yillik koeffitsiyenti va, K – inshootni yoki qurilmaning elementini narxi.

Xizmat ko‘rsatishga va joriy ta’mirlashga chiqimi quyidagi formula orqali aniqlanadi
U_tr=K ^. E_tr

bunda E_tr – xizmat ko‘rsatish va joriy ta’mirlashga yillik koeffitsient.

Tejamli va effektli variantni tanlashda taqqoslash metodi qulaydir. Bu holatda o‘z xarajatlarini qoplash muddati quyidagi formula orkali aniqlanadi
T_ok=(K₁ – K₂)/(U_e2 – U_e1) [yil]

Norma qoidasiga asosan o‘z xarajatlarini qoplash muddati T_ok=7-8 yil.

O‘z xarajatlarini qoplash muddatini aniqlashda quyidagi holatlar kuzatiladi:

1. 
   Agar T_ok< T_n bo‘lsa kam ekspluatatsiya xarajatli va katta kapital mablag‘li variant tanlanadi.
   
2. 
   Agar T_ok> T_n bo‘lsa katta ekspluatatsiya xarajatli va kam kapital mablag‘li variant tanlanadi.
   
3. 
   Agar T_ok = T_n bo‘lsa ishonchliligi bo’yicha taqqoslanib maqsadga muvofiq variant tanlanadi.
   

a)Kapital mablag‘ K=4.743+4.743+2.361+2.361+9.696+9.463+35.064+34.3+6.296+6.771+21.311+21.311+20.338+20.338+23.461+23.461+24.116=270.134 mln. so‘m

b) Bir yilda elektr energiya isrofi narxi:

U_pe=0.942+0.942+0.392+0.392+3.179+3.101+32.779+31.994+2.296+2.473+6.477+6.477+6.084+6.084+7.066+7.066+7.262=125.006 mln. so‘m /yil

v) Amortizatsiyaga chiqimi kuchlanishi 6 kVgacha yerda yotqizilgan kabel liniya uchun E_a=0,03 bo‘lganini hisobga olib

U_a=K ^. E_a = 270.134^. 0,03 = 8.104 mln. so‘m/yil;

g) Xizmat ko‘rsatish va ta’mirlashga chiqim koeffitsienti kuchlanishi 6 kVgacha yerda yotqizilgan kabel liniya uchun E_tr=0,015 bo‘lganini hisobga olib

U_tr=K ^. E_tr =270.134 ^. 0,015 = 4.052 mln. so‘m /yil

d) Ekspluatatsiyaga chiqimlar

U_e=U_pe+U_a+U_tr = 125.006+8.104+4.052=137.162 mln. so‘m

e) Keltirilgan xarajatlar E_n=0,125

Z=E_n^. K+U_e = 0,125 ^. 270.134 +137.162=170.928 mln. so‘m /yil