three wattmeter method
- 1. TOPIC:-THREE WATTMETER METHOD ELEMENTS OF ELECTRICAL ENGINEERING 211005 GUIDED BY:- ANKUR SIR
- 2. Power is measured in the electric circuits using a Wattmeter.A single phase Wattmeter consists of two coils,namely the curent coil and the pressure coil.The current coil is connected is series with line and thus carries the line current.The pressure coil is connected in parallel with the line.The wattmeter reading gives the power per phase
- 3. Power measurement in the 3-phase system depends upon whether the load connected across it is balanced or unbalanced and whether it is in star or delta.Power in the three-phase circuits is measured using the various method
- 4. Various methods are used measurement of three phase power inthree phase circuits on the basis of number of wattmeter used. We have three methods 1. Three wattmeters method 2. Two wattmeters method 3. Single wattmeter method.
- 5. THREE PHASE CIRCUIT DIAGRAM IS SHOWN ABOVE
- 6. Here, it is applied to three phase four wire systems, current coil of all the three wattmeters marked as one, two and three are connected to respective phases marked as one, two and three. Pressure coils of all the three wattmeter are connected to common point at neutral line. Clearly each wattmeter will give reading as product of phase current and line voltage which is phase power
- 7. . The resultant sum of all the readings of wattmeter will give the total power of the circuit. Mathematically we can write as
- 8. The power in a three-phase system may be measured by placing a single-phase wattmeter in each phase and adding the three readings. This method is possible in a A system only if the phase units can be separated and in a Y- system only if the neutral or wye point can be reached
- 9. THANK YOU PREPARED BY:- PARVEZ KHAN 151080106026 CIVIL