Although this post is beyond late
, the Attached Animated Gif
Kind'Of demonstrates some key functions, applicable to a Polyphase System.
(applicable if Two or more of these Transformers are connected together and supplied with a Polyphase AC Input)
Link to Full-Size Version:
https://www.electrical-contractor.net/theory/1PH3W_FLOW_ANIM01.gifThe Animation describes a Single Phase Transformer's flow characteristics, as observed on the Two Wire Primary, and the Three Wire Center-Tapped Secondary.
Simplest way to observe Polyphase "Phases":
Connect (2) Transformers in an Open Delta configuration on both the Primary and Secondary sides.
Per the Secondary connections, only connect the "ENDS" of each Winding - leaving the Center-Taps unused.
Drive the Primary side with an Alternating Current comprised of at least Two separate - yet interconnected - Voltage (E) & Current (I) "Lines", derived from the Generating Source.
Each of these interconnected "Lines" is an individual _PHASE_
If only Two E&I "Lines" are established by the AC Generating Source, the Polyphase System is "Two Phase".
If Three E&I "Lines" are established by the AC Generating Source, the Polyphase System is "Three Phase".
Since the Animation example above can only be connected across _TWO WIRES_ of an AC Generating Source, there is only _ONE_ E&I "Line" available for use - resulting in a "Single Phase System".
-- Scott