Table of Contents
- 1 When two wattmeter method of measurement of power is used to measure power in a balanced three-phase circuit if the wattmeter reading is zero then?
- 2 How do you calculate power factor when only 2 wattmeter readings are known?
- 3 At which angle in two wattmeter method one wattmeter shows zero reading?
- 4 What is measured by two wattmeter method?
- 5 Which type of load is used in the experiment of power measurement by 2 wattmeter method?
When two wattmeter method of measurement of power is used to measure power in a balanced three-phase circuit if the wattmeter reading is zero then?
In the Two wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is? Explanation: The load power factor is = 0.5. Since at this power factor one wattmeter shows zero and the other shows a positive maximum value of power.
How do you calculate power factor when only 2 wattmeter readings are known?
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.
Why do we use 2 wattmeter method?
The two wattmeter method is used in determining total power derived from the three phase load which is always constant, regardless of variations in phase power as well as angular displacement. Thus, the power output from a three-phase motor is also constant based on the findings using the said measurement.
What will be reading on wattmeter when two wattmeter method is used for measurement of power with load PF 0.5 lag?
Thus we see that, when the power factor of load is unity then both the wattmeter reads the same value. Case2: When power factor of load is 0.5 lagging. Thus we see that, when power factor of load is 0.5 lagging then power is only measured by first wattmeter and reading of second wattmeter is ZERO.
At which angle in two wattmeter method one wattmeter shows zero reading?
Explanation: When p.f. = 0.5, 0 = 60° and one of the wattmeters reads zero.
What is measured by two wattmeter method?
Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system.
What is the type of wattmeter used in two wattmeter method?
What is Two Wattmeter Method? A three-phase two-watt meter measures the current and voltage from any of the 2 supply lines of 3 phase corresponding to the 3rd supply line of 3 phase. The 3 phase 2 wattmeter is said to be at a balanced load condition if the current in every phase lag at an angle “φ” with phase voltage.
What are the two types of wattmeter?
There are two types of Wattmeter given below:
- Dynamometer Type Wattmeter.
- Induction type Wattmeter.
Which type of load is used in the experiment of power measurement by 2 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.