Electric Circuit Analysis: Unit IV: Three phase circuits

Additional solved problems

Three phase circuits | Electric Circuit Analysis

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Electric Circuit Analysis: Unit IV: Three phase circuits : Additional solved problems

ADDITIONAL SOLVED PROBLEMS

1. A 3-phase, 440 V supply feeds an unbalanced, delta connected load in which ZRY-20/30°, ZYB = 2020° Q, ZBR = 20-30° Q. Phase sequence is RYB. Determine the readings of two wattmeters which are placed in R and Y lines for measurement of 3 phase power.

Solution:

The phase currents can be expressed in the polar form as below.

Now, the line currents I_R, I_Y and I_B are calculated by applying KCL as shown below.

Answers:

I_R= 39.2 ∠ -48.4° A

I_Y= 15.17 ∠ -127.7° A

I_B= 44.6 ∠ 112° A

Electric Circuit Analysis: Unit IV: Three phase circuits : Tag: : Three phase circuits | Electric Circuit Analysis - Additional solved problems

Home | Department: EEE Department | Ist Year | Subject: Electric Circuit Analysis |

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Electric Circuit Analysis: Unit IV: Three phase circuits

Generation of 3 Phase Voltage

representation of the phase voltage in the polar and rectangular forms and drawing the phasor diagram

Phase sequence - Three phase circuits

Interconnection of the three phases - 1.Star or Y, 2.Delta or Mesh Connection

Balanced star connected load - Three phase circuits

Balanced delta connected load - Three phase circuits

Worked examples - Balanced star, delta connected load | Three phase circuits

Three phase power measurement - two-watt meter method

Worked examples - Three phase power measurement by 2 wattmeter method

Additional solved problems - Three phase circuits | Electric Circuit Analysis

Points to remember in three phase circuits - Electric Circuit Analysis

Exercise - Three phase circuits | Electric Circuit Analysis

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