Q10Basic Electrical Engineering
Question
2 marks
Q.10. Give some method available for measuring 3-phase power.
Answer
Common methods for measuring 3-phase power include the single-wattmeter, two-wattmeter, and three-wattmeter methods.
The measurement of power in 3-phase circuits can be accomplished using several wattmeter configurations depending on the circuit type (star/delta) and balance:
- 1. Single-Wattmeter Method: Applicable ONLY for perfectly balanced 3-phase loads. The reading is multiplied by 3.
- 2. Two-Wattmeter Method: The most universal method. It measures total power in both balanced and unbalanced 3-phase, 3-wire systems. Total power .
- 3. Three-Wattmeter Method: Used primarily for unbalanced 3-phase, 4-wire systems. Total power is the algebraic sum of all three readings.