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Консультация № 180668
10.11.2010, 11:59
51.04 руб.
0
2
1
Помогите, пожалуйста, разобраться!!!
Для трехфазного трансформатора, соединение обмоток которого Y/ – 11 , известно:
номинальное напряжение на зажимах первичной обмотки трансформатора U1ном = 6000 В ,
напряжение холостого хода на зажимах вторичной обмотки трансформатора U20 =690 В.
Вычислить коэффициент трансформации.
n = U1ном/U20 или n = U1ном / U20* 3
Спасибо.
Для трехфазного трансформатора, соединение обмоток которого Y/ – 11 , известно:
номинальное напряжение на зажимах первичной обмотки трансформатора U1ном = 6000 В ,
напряжение холостого хода на зажимах вторичной обмотки трансформатора U20 =690 В.
Вычислить коэффициент трансформации.
n = U1ном/U20 или n = U1ном / U20* 3
Спасибо.
Обсуждение
10.11.2010, 14:16
общий
это ответ
Здравствуйте, Караман Ольга!
В большинстве случаев обмотки трехфазных трансформаторов соединяют либо в звезду -Y, либо в треугольник - ?
Фазный коэффициент трансформации трехфазного трансформатора находят, как соотношение фазных напряжений при холостом ходе:
nф = Uфвнх / Uфннх,
а линейный коэффициент трансформации, зависящий от фазного коэффициента трансформации и типа соединения фазных обмоток высшего и низшего напряжений трансформатора, по формуле:
nл = Uлвнх / Uлннх.
Если соединений фазных обмоток выполнено по схемам "звезда-звезда" (Y/Y) или "треугольник-треугольник" (?/?), то оба коэффициента трансформации одинаковы, т.е. nф = nл.
При соединении фаз обмоток трансформатора по схеме "звезда - треугольник" (Y/?) - nл = nфv3, а по схеме "треугольник-звезда" (? / Y) - nл = nф /v3
эффициентом трансформации (К) называется отношение напряжения обмотки ВН к напряжению обмотки НН при холостом ходе трансформатора:
Для трехобмоточных трансформаторов коэффициентом трансформации является отношение напряжений обмоток ВН/СН, ВН/НН и СН/НН.
значит для Вашего случая справедливо n = U1ном/U20
В большинстве случаев обмотки трехфазных трансформаторов соединяют либо в звезду -Y, либо в треугольник - ?
Фазный коэффициент трансформации трехфазного трансформатора находят, как соотношение фазных напряжений при холостом ходе:
nф = Uфвнх / Uфннх,
а линейный коэффициент трансформации, зависящий от фазного коэффициента трансформации и типа соединения фазных обмоток высшего и низшего напряжений трансформатора, по формуле:
nл = Uлвнх / Uлннх.
Если соединений фазных обмоток выполнено по схемам "звезда-звезда" (Y/Y) или "треугольник-треугольник" (?/?), то оба коэффициента трансформации одинаковы, т.е. nф = nл.
При соединении фаз обмоток трансформатора по схеме "звезда - треугольник" (Y/?) - nл = nфv3, а по схеме "треугольник-звезда" (? / Y) - nл = nф /v3
эффициентом трансформации (К) называется отношение напряжения обмотки ВН к напряжению обмотки НН при холостом ходе трансформатора:
Для трехобмоточных трансформаторов коэффициентом трансформации является отношение напряжений обмоток ВН/СН, ВН/НН и СН/НН.
значит для Вашего случая справедливо n = U1ном/U20
Об авторе:
to live is to die
to live is to die
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