1- amaliy mashg’ulot. Transformatorlarning parametrlarini hisoblash

MAXSUS ELEKTR MEXANIK O‘ZGARTGIChLAR” FANIDAN AMALIY MASHG‘ULOTLARI

1- Amaliy mashg’ulot. Transformatorlarning parametrlarini hisoblash
Parametrlari 1-jadvalda berilgan uch fazali transformatorni salt ishlash va nominal rejimdagi quvvat koefisientini - cos φ₀ va cos φ, birlamchi va ikkilamchi chulg’am karshiliklarini, β=0,8 yuklanish koeffisientidagi quvvat va energiya isrofini hisoblang.

1-jadval.

Variant	Ulanish guruxi	Snom, kVA	Uyuk, kV	Upk, kV	Uk, %	∆Pk, Vt	∆P0, Vt	Io, %
1	Y/Yo-0	10	6300	400	5,0	335	105	10,0
2	Y/∆-11	20	6300	230	5,0	600	180	9,0
3	Y/Yo-0	30	10000	400	5,0	850	300	9,0
4	Y/Yo-0	50	10000	400	5,0	1325	400	8,0
5	Y/Yo-0	75	10000	230	5,0	1875	590	7,5
6	Y/∆-11	100	10000	525	5,0	2400	730	7,5
7	Y/∆-11	180	6300	525	5,0	4100	1200	7,0
8	Y/Yo-0	240	6000	525	5,0	5100	1600	7,0
9	Y/∆-11	320	10000	400	5,5	6200	2300	7,0
10	Y/Yo-0	420	35000	10500	6,5	7000	125	7,0
11	Y/∆-11	25	6000	400	5,0	600	125	3,0
12	Y/Yo-0	25	10000	400	4,5	690	125	3,0
13	Y/∆-11	40	10000	230	4,5	880	180	3,2
14	Y/∆-11	40	6300	230	4,5	1000	180	2,8
15	Y/Yo-0	63	10000	400	4,7	1470	260	2,8
16	Y/Yo-0	63	6300	400	4,5	1470	260	2,8
17	Y/∆-11	100	10000	400	4,7	1280	365	2,6
18	Y/∆-11	100	6300	230	4,5	2270	365	2,4
19	Y/Yo-0	160	10000	400	4,5	2650	465	2,4
20	Y/Yo-0	75	10000	400	5,0	1325	400	8,0
21	Y/Yo-0	50	10000	230	5,0	1875	590	7,5
22	Y/∆-11	1600	6300	525	5,0	1600	1000	7,0
23	Y/∆-11	180	10000	400	7,0	2400	1200	7,5
24	Y/Yo-0	240	6000	525	5,0	5100	1600	7,0
25	Y/∆-11	320	10000	400	5,5	6200	2000	7,0

A V S

a v s 0

1-rasm. Uch fazali transformatorni «yulduz» ulanish sxemasi.

Yechish

T r a n s f o r m a t o r l a r.

Transformatorlar elektr tarmoklarda va sanoat korxonalarining elektr ta’minot tizimida radiotexnikada,tugrilagichlarda,elektr payvandlashda va boshka soxalarda kuchlanish uzgartirgichlar sifatida ishlatiladi.

Transformatorlar asosan mis yoki alyuminiy simlardan uralgan uramlar (chulgamlar) va maxsus elektrotexnik pulatdan yasalgan uzakdan iborat.Uning ishlash prinsipi elektromagnit induksiya konuniga asoslangan.

Misol tarikasida sanoat korxonalarning elektr ta’minotida ishlatiladigan pasaytiruvchi transformatorni tanlash va uning bir yillik elektr energiya isrof kiymatini xisoblashni kurib chikamiz.

Transformator kupincha yulduzcha nolli usulda boglanadi.Bunda birlamchi chulgamdagi nominal tok kuyidagicha xisoblanadi:

Variant	Ulanish guruxi	Snom, kVA	Uyuk, kV	Upk, kV	Uk, %	∆Pk, Vt	∆P0, Vt	Io, %
1	Y/Yo-0	100	6000	400	5,5	2400	600	6,7

Salt ishlash tokini va quvvat koeffisientini xisoblaymiz;