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Which power factor results equal reading of both wattmeter in 2 wattmeter method -

Which power factor results equal reading of both wattmeter in 2 wattmeter method - Correct Answer Unity

Concept:

The diagram of 3 phase 2 wattmeter is given below.

(Phase angle)

Wattmeter readings (W)

Remarks

W­­1

W2

1.

Pf = unity

(ϕ = 0° )

+ve

+ve

W­­1 = W2

2.

0.5 < p.f.< 1.0

(60° > ϕ > o° )

+ve

+ve

W­­1 > W2

3.

Pf = 0.5

(ϕ = 60° )

+ve

zero

Total power = W1

4.

0 < Pf < 0.5

(90° > ϕ > 60° )

+ve

-ve

|W­­1|> |W2| (Total power is positive)

5.

Pf = 0

(ϕ =90° )

+ve

-ve

|W­­1|= |W2| (Total power = zero)

 

From the above table, it is clear that when the p.f. of the circuit is unity then the reading of both the Wattmeter is the same.

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