If single phase is 230 V and 3 phase is 440 v then what about for 2 phase?
And why is it so?
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mainspower electronicsthree phase
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Best Answer
Here is what wikipedia says about two-phase power.
Single phase and 3 phase are unrelated to 2 phase described above. Basically, 3 phase is what the power stations produce now and ultimately this gets distributed as 3 single phases to our homes: -
There are three line voltages shown in red that are 120ยบ apart in phase orientation. This can be seen as three single phase voltages (blue) and if you did the trigonometry you'd see that the length of red is sqrt(3) times bigger than the length of blue hence, if you have 230V phase voltage, the line voltage would be 398V. Here's how the voltages look in time: -
Going back a few years when the UK had 240V, the line voltage was 415V and sometimes 440V line voltages were referred to ans they yielded a phase voltage of 250V.