How do you find the power factor using the two wattmeter method?

How do you find the power factor using the two wattmeter method?

Similarly, power measured by the wattmeter-2 is, W2 = VL IL cos(30 + 0) = √3/2 VL I. Hence, at unity power factor, both the wattmeters read half the value of total power consumed by the load i.e., both wattmeters read the same values.

What is the power factor in a 3 phase power measurement of two wattmeter?

Q5. The power of system, three-phase 10 kVA load with a power factor of 0.342, is measured by two-wattmeter method. The readings of two wattmeters are W1 and W2.

Can you measure reactive power in a three-phase circuit using two wattmeter method?

The two-wattmeter method of power measurement in three-phase circuits is well known and is taught in a measurements/circuits class of an undergraduate electrical engineering course. When the source and the load are balanced, one can compute the reactive power as a difference of the two wattmeter readings (see pp.

What are the methods of measuring 3 phase power and power factor?

The three phase power measurement can be carried out using the following methods: One wattmeter method. Two wattmeter method. Three wattmeter method.

Which method can be used to measure the power in a three-phase balanced and unbalanced load system?

The one-wattmeter method is used for the measurement of three-phase power in case balanced loads only. It is used for both star and delta connected loads. Two wattmeter method and three wattmeter methods are used for both balanced and unbalanced loads.

Which is the following method is not used to measure three-phase power?

The total power in a three wattmeter method of power measurement is given by the algebraic sum of the readings of three wattmeters. i.e. Except for 3 phase, 4 wire unbalanced load, 3 phase power can be measured by using only Two Wattmeter Method.

Which method can be used to measure the power in a three-phase unbalanced load system?

Three wattmeter method is used when the load is unbalanced. For unbalanced load, the power in each phase will be different, thus three different wattmeters for each phase are used. Here, the sum of three wattmeters will give the total power consumed by the load.

What are the methods to measure power in a three-phase circuit?

Measurement of Three Phase Power

• Three wattmeters method.
• Two wattmeters method.
• Single wattmeter method.

How we can measure reactive power?

The reactive power of the single phase circuit is measured by the Varmeter (Volt ampere reactive meter). The varmeter is a type of the Electrodynamometer Wattmeter in which the pressure coil of the meter is made highly inductive.

What are the methods for measurement of 3 phase unbalanced power?

To measure power it is not necessary to use three wattmeter, even two wattmeters can be used for the purpose. Except for 3 phase, 4 wire unbalanced load, three-phase power are measured using only Two Wattmeter Method.

Which of the following method is used to measure power in a three-phase system?

In a 3-phase system, two-wattmeter method is used to measure the power.

How to measure three phase power using two wattmeter method?

In two wattmeter method, a three phase balanced voltage is to a balanced three phase load where the current in each phase is assumed lagging by an angle of Ø behind the corresponding phase voltage. The schematic diagram for the measurement of three phase power using two wattmeter method is shown below.

How much power is consumed by a two wattmeter?

In this, let us see the two wattmeter method with a balanced load. In a balanced three-phase system total power consumed will be √3 V L I L cos φ, this will be equal to the sum of the readings measured by the two wattmeters in two wattmeter method.

What is the total power consumed in a balanced three-phase system?

In a balanced three-phase system total power consumed will be √3 V L I L cos φ, this will be equal to the sum of the readings measured by the two wattmeters in two wattmeter method. The connection diagram for two wattmeter method of measuring the three-phase power of balanced star connected load is shown below.

What is two wattmeter method of balanced voltage?

Two Wattmeter Method: In two wattmeter method, a three phase balanced voltage is to a balanced three phase load where the current in each phase is assumed lagging by an angle of Ø behind the corresponding phase voltage.