MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Three Phase Two Wattmeter Method-2

A symmetrical...

Question

A symmetrical three-phase three-wire RYB system is connected to a balanced delta-connected load. The RMS values of the line current and line-to-line voltage are 10 A and 400 V respectively. The power in the system is measured using the two wattmeter method. The first wattmeter connected between R-line and Y-line reads zero. The reading of the second wattmeter (connected between B-line and Y-line) in watt is
3464.1

Open in App

Solution

The correct option is A 3464.1
As the load is balanced and one of the watt-meter read zero power factor is 0.5.

Reading of the other wattmeter will be

$W_{1} = V_{L} I_{L} c o s (30 - ϕ)$
$W_{2} = V_{L} I_{L} c o s (30 + ϕ)$

when,
$c o s ϕ = 0.5$

$W_{2} = V_{L} I_{L} c o s (30 + 60)$

$= V_{L} I_{L} c o s 90 = 0$

$W_{1} = 10 \times 400 c o s (30 - 60) = 3464.1 W$

Suggest Corrections

thumbs-up

2

Similar questions

Q. The power flow in a 3-phase, 3-wire balanced delta connected load is measured by the two wattmeter method. The reading of wattmeter 'A' is 6000 W and on wattmeter 'B' is -1000 W. If the voltage of the circuit is 440 V, 50 Hz. What is the value of capacitance connected in delta at the source to cause the whole of the power measured by wattmeter A only?

Q. A single-phase load is connected between R and Y terminals of a 415 V, symmetrical, 3-phase, 4 wire system with phase sequence RYB. A wattmeter is connected in the system as shown in the figure. The power factor of the load is 0.8 lagging. The wattmeter will read

Q. Two wattmeters are connected to measure power in a 3-phase network. The two readings are 2000 watts and 1000 watts respectively. If another wattmeter to be connected such that its current coil is in one phase and the potential coil is across the other two phase terminals. Then the reading of wattmeter is _______VAR.

Q. Two wattmeters, which are connected to measure the total power in a three-phase system supplying a balanced load, read 10.5 kW and -2.5 kW, respectively. The total power and the power factor respectively, are

Q. A 3-phase balanced load which has a power factor of 0.707 is connected to a balanced supply. The power consumed by the load is 5 kW. The power is measured by the two-wattmeter method. The readings of the two wattmeters are

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Three Phase Two Wattmeter Method-2

MEASUREMENT

Watch in App

explore_more_icon

Explore more

Three Phase Two Wattmeter Method-2

Other Measurement

Join BYJU'S Learning Program

CrossIcon