In star connection when is the load said to be balanced

In a star connected 3 phase resistive load, the phase current is 20 A. If the same resistances are connected in delta and same 3 phase Voltage is applied, what is the phase current?

The given symbol represents which one of the following connection? A three-phase balanced voltage is applied to the load shown.

The phase sequence is RYB. Suggested Test Series. Suggested Exams. Unbalanced current affects transformer and it may also cause damage to the transformer and for this star connection is preferred for long distance transmission. Retrieved November 14, Learn About Live Editor.

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Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search MathWorks. Toggle navigation BrainKart. Posted On : Phasor diagram of three phase supply: Connection of Three phases supply: Relation between the line current and phase current: Relation between the line voltage and phase voltage: Relation between the line current and phase current:.

Phasor diagram of three phase supply: Star Connection: Connection of Three phases supply: 1 Star connection: a. The terminals R, Y and B are connected together to form the star point, also called the neutral N. Line Voltage: The voltage between the any two lines is called line voltage. Phase Voltage: The voltage between the line and neutral point is called phase voltage. Relation between the line voltage and phase voltage: Line current: o The current through the line is called line current.

Phase current: o The current through in any phase winding is called Phase current. Delta Connection: 1 The end of the one winding R is connected to the start of the next phase winding Y. Three phase balanced and unbalanced voltage sources: i. Balanced load: 7 A balanced load is one in which the phase impedances are equal in magnitude and in phase iv. Unbalanced load: 8 An unbalanced load is one in which the phase impedances are different in magnitude and phases.

Types of Unbalanced load: 9 Unbalanced 3 wire star connected load 10 Unbalanced 4 wire star connected load 11 Unbalanced 3 wire delta connected load b. Star Connected load: Consider a Y-connected load. Similarly, you can find the other line voltages as, See the phasor diagram above. Delta connected load: Consider now a -connected load.

Two wattmeter method The connection and phasor diagram are shown for an assumed abc phase sequence and lagging power factor. Two-wattmeter method- connection diagram and phasor diagram The watt-meter readings are given by, The sum of the two watt-meter readings gives the total three phase power, The power factor angle can also be found from, one of the watt-meters will give negative readings.

Advantages of Two wattmeter method: 1. Disadvantages: 1. Analysing Three Phase Circuits. Star connection and Star connection. Introduction to AC Circuits. Star Delta transformation.