Sinov transformatorini tanlashda quyidagi fikrlarni hisobga olish kerak:
(1) Voltage: according to the requirements of the test object, first select the test transformer with appropriate voltage, so that the rated voltage Un at the high voltage side of the test transformer is higher than the test voltage Us of the test object, that is, Un>Biz. Ikkinchidan, sinov transformatori tomonidan talab qilinadigan past kuchlanishli yon kuchlanish joyidagi quvvat manbai kuchlanishiga va voltaj regulyatoriga mos kelishini tekshiring.
(2) Current: The rated output current In of the test transformer shall be greater than the current Is required by the tested object, that is, In>Bu. Sinov ob'ekti uchun zarur bo'lgan oqim uning sig'imi bo'yicha baholanishi mumkin, Is=Us w Cx, bu erda Cx sinov ob'ekti sig'imi va qo'shimcha sig'imni o'z ichiga oladi.
(3) Imkoniyat: Sinov transformatorining nominal oqimi va nominal kuchlanish chiqishiga ko'ra, sinov transformatorining quvvati aniqlanishi mumkin, ya'ni P=UnIn.
Vazirlik standartlariga muvofiq, Xitoyda sinov transformatorlarining kuchlanish darajalari: 5, 10, 25, 35, 50, 100, 150, 300 kV va boshqalar; Quvvat darajalari: 3, 5, 10, 25, 50, 100, 150, 200kVA va boshqalar.
Hisoblash natijalari va vazirlik standartlariga ko'ra, kerakli sinov transformatorini tanlash mumkin. Agar maxsus talablar mavjud bo'lsa, maxsus xususiyatlarga ega sinov transformatorlari odatda ishlab chiqaruvchidan buyurtma berilishi mumkin.