Question
Download Solution PDFIn a balanced three-phase star connected system, if the line current is 30 A, then its phase current is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
In a three-phase load, three different impedances are connected together in a star or delta fashion.
The delta in a three-phase system is formed by connecting one end of the winding to the starting end of other winding and the connections are continued to form a closed loop.
The star in the three-phase system is formed by connecting one end of all three impedances are connected together.
Important Points:
In a star-connected three-phase system,
- VL = √3 × Vph
- IL = Iph
- \({I_{ph}} = \frac{{{V_L}}}{{\surd 3Z}}\)
In a delta connected three-phase system,
- VL = Vph
- IL = √3 × Iph
- \({I_{ph}} = \;\frac{{{V_L}}}{Z}\)
Where,
VL is line voltage
Vph is phase voltage
IL is line current
Iph is the phase current
Application:
Given-
IL = 30 A
As given 3-ϕ system is star connected system, then phase current is
Iph = IL = 30 A
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