вопрос по тору

[Mikola]

Есть такой вариант:
Тew 300VA toroidal transformer. It is precisely made for high-end power amp or CNC equipment. It has very low power loss and magnetic leak. Labeled input 115 + 115 Vac (Dual coils) and outputs 18Vac x 2 (dual coils). It has CE certified. Mounting hardware is included. The test results are excellent. (note: Please increase 10% of rated power when this transformer use in 60 Hz power source)
Open Circuit Test (core loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 115-180VAC at 60Hz. No load on secondary coils.
1. Primary V = 120VAC, Primary I = .03A or core loss is 3Watt.
2. Primary V = 140VAC, Primary I = .07A or core loss is 8Waat.
Short Circuit Test (copper loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 1-20VAC at 60Hz and short circuit on secondary coils. The test result is 7.8V and 2.75A or 22Watt which is the maximum rated copper loss
Dielectric Test:
TEST CONDITION: Apply dielectric meter between primary coils and secondary coils; and increase voltage up to 3500VAC. No initiate any spark.
Load Test Result:
TEST CONDITION: Input 115VAC 60Hz to the primary coil; parallel 2 secondary coils, 5 ohm 250W resistors as dummy load and room temperature at 25 degree C. Temperature rises 5 degree C after an hour test at load test #3.
1. Primary I = 0.02A, Secondary V = 18.1VAC at 0.0A, Power = 0 Watt
2. Primary I = 1.45A, Secondary V = 17.6VAC at 8.50A, Power = 149 Watt
3. Primary I = 2.92A, Secondary V = 17.1VAC at 16.2A, Power = 278 Watt
Dimension – 4.8” Diameter x 2.9” High.
Weight – 7.3 LB net.
Wire lead – 12” color-coded.

Вопрос: это намного лучше/хуже по параметрам того, что предлагает Торэл, Родник, Talema и т.д.?

[Sergiy]

Есть такой вариант:
Тew 300VA toroidal transformer. It is precisely made for high-end power amp or CNC equipment. It has very low power loss and magnetic leak. Labeled input 115 + 115 Vac (Dual coils) and outputs 18Vac x 2 (dual coils). It has CE certified. Mounting hardware is included. The test results are excellent. (note: Please increase 10% of rated power when this transformer use in 60 Hz power source)
Open Circuit Test (core loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 115-180VAC at 60Hz. No load on secondary coils.
1. Primary V = 120VAC, Primary I = .03A or core loss is 3Watt.
2. Primary V = 140VAC, Primary I = .07A or core loss is 8Waat.
Short Circuit Test (copper loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 1-20VAC at 60Hz and short circuit on secondary coils. The test result is 7.8V and 2.75A or 22Watt which is the maximum rated copper loss
Dielectric Test:
TEST CONDITION: Apply dielectric meter between primary coils and secondary coils; and increase voltage up to 3500VAC. No initiate any spark.
Load Test Result:
TEST CONDITION: Input 115VAC 60Hz to the primary coil; parallel 2 secondary coils, 5 ohm 250W resistors as dummy load and room temperature at 25 degree C. Temperature rises 5 degree C after an hour test at load test #3.
1. Primary I = 0.02A, Secondary V = 18.1VAC at 0.0A, Power = 0 Watt
2. Primary I = 1.45A, Secondary V = 17.6VAC at 8.50A, Power = 149 Watt
3. Primary I = 2.92A, Secondary V = 17.1VAC at 16.2A, Power = 278 Watt
Dimension – 4.8” Diameter x 2.9” High.
Weight – 7.3 LB net.
Wire lead – 12” color-coded.

Вопрос: это намного лучше/хуже по параметрам того, что предлагает Торэл, Родник, Talema и т.д.?

Сам по себе тор не плохой. Судя по габаритам и весу магнитопровод взят с запасом по мощности. Показатели при испытаниях - 7,5% просадки под нагрузкой, очень не плохой результат. Ток х.х при 230В будет порядка 35мА, значит расчётная индукция была достаточно высокая ~ 1.7Тл. Не понятна только ситуация с намоткой первички. Если она моталась в два провода одновременно, то велика вероятность пробоя лака на проводах при последовательном включении обмоток.

[Mikola]

Спасибо. Проблема ещё в том, что при цене трансформатора $36 доставка обойдется в $40, что меня обламывает. Буду заказывать у Вас.