p*e
2 楼
i am not sure if i understand your question clearly. anyway, the following
is some difference between US and China residential 3-phase voltage:
Frequency: 60Hz vs. 50Hz
line-to-line voltage rms: 208VAC vs. 380VAC
Note, for some appliances, you will see three prongs from the outlet plug.
But they might not be three-phase power since they are actually single phase
supply with opposite phases. For example, phase a, neutral, and another
phase a out of 180 degrees. in this way, the voltage betw
【在 d****4 的大作中提到】
: 先多谢！
is some difference between US and China residential 3-phase voltage:
Frequency: 60Hz vs. 50Hz
line-to-line voltage rms: 208VAC vs. 380VAC
Note, for some appliances, you will see three prongs from the outlet plug.
But they might not be three-phase power since they are actually single phase
supply with opposite phases. For example, phase a, neutral, and another
phase a out of 180 degrees. in this way, the voltage betw
【在 d****4 的大作中提到】
: 先多谢！
c*n
3 楼
for residential use... most of them are single phase
e.g. 110V v.s. 220v
strangly, i found some 208vac outlet in our library reading desk...
which requires special power cord...
following
phase
LIVE
【在 p***e 的大作中提到】
: i am not sure if i understand your question clearly. anyway, the following
: is some difference between US and China residential 3-phase voltage:
: Frequency: 60Hz vs. 50Hz
: line-to-line voltage rms: 208VAC vs. 380VAC
: Note, for some appliances, you will see three prongs from the outlet plug.
: But they might not be three-phase power since they are actually single phase
: supply with opposite phases. For example, phase a, neutral, and another
: phase a out of 180 degrees. in this way, the voltage betw
e.g. 110V v.s. 220v
strangly, i found some 208vac outlet in our library reading desk...
which requires special power cord...
following
phase
LIVE
【在 p***e 的大作中提到】
: i am not sure if i understand your question clearly. anyway, the following
: is some difference between US and China residential 3-phase voltage:
: Frequency: 60Hz vs. 50Hz
: line-to-line voltage rms: 208VAC vs. 380VAC
: Note, for some appliances, you will see three prongs from the outlet plug.
: But they might not be three-phase power since they are actually single phase
: supply with opposite phases. For example, phase a, neutral, and another
: phase a out of 180 degrees. in this way, the voltage betw
H*n
4 楼
美国的频率是60HZ,这就无须多言.
居民用电大多是一种叫Split Phase(常常被错误的简称为两相电),如poppe所言,+120,0
,-120,所以你可以有120V(110V)或240V.
至于208V,那时因为在工业商业用电,有时用通常说的abc三相电,208是线电压=120相电
压*sqrt(3).
following
phase
LIVE
【在 p***e 的大作中提到】
: i am not sure if i understand your question clearly. anyway, the following
: is some difference between US and China residential 3-phase voltage:
: Frequency: 60Hz vs. 50Hz
: line-to-line voltage rms: 208VAC vs. 380VAC
: Note, for some appliances, you will see three prongs from the outlet plug.
: But they might not be three-phase power since they are actually single phase
: supply with opposite phases. For example, phase a, neutral, and another
: phase a out of 180 degrees. in this way, the voltage betw
居民用电大多是一种叫Split Phase(常常被错误的简称为两相电),如poppe所言,+120,0
,-120,所以你可以有120V(110V)或240V.
至于208V,那时因为在工业商业用电,有时用通常说的abc三相电,208是线电压=120相电
压*sqrt(3).
following
phase
LIVE
【在 p***e 的大作中提到】
: i am not sure if i understand your question clearly. anyway, the following
: is some difference between US and China residential 3-phase voltage:
: Frequency: 60Hz vs. 50Hz
: line-to-line voltage rms: 208VAC vs. 380VAC
: Note, for some appliances, you will see three prongs from the outlet plug.
: But they might not be three-phase power since they are actually single phase
: supply with opposite phases. For example, phase a, neutral, and another
: phase a out of 180 degrees. in this way, the voltage betw
y*n
5 楼
赞这条，说的对，他们其实很多也是240v，但3条线，line to line 是240v， line to
neutral是120v。
三相208v，每单相是120v。
三相480v。每相是277v。
,0
【在 H******n 的大作中提到】
: 美国的频率是60HZ,这就无须多言.
: 居民用电大多是一种叫Split Phase(常常被错误的简称为两相电),如poppe所言,+120,0
: ,-120,所以你可以有120V(110V)或240V.
: 至于208V,那时因为在工业商业用电,有时用通常说的abc三相电,208是线电压=120相电
: 压*sqrt(3).
:
: following
:
: phase
: LIVE
neutral是120v。
三相208v，每单相是120v。
三相480v。每相是277v。
,0
【在 H******n 的大作中提到】
: 美国的频率是60HZ,这就无须多言.
: 居民用电大多是一种叫Split Phase(常常被错误的简称为两相电),如poppe所言,+120,0
: ,-120,所以你可以有120V(110V)或240V.
: 至于208V,那时因为在工业商业用电,有时用通常说的abc三相电,208是线电压=120相电
: 压*sqrt(3).
:
: following
:
: phase
: LIVE
d*4
6 楼
> line to neutral是120v
> line to line 是240v
> 三相208v
为什么三相（line to line to line）的电压，反而比两相（line to line）的电压低
？
> line to line 是240v
> 三相208v
为什么三相（line to line to line）的电压，反而比两相（line to line）的电压低
？
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