TWO WATTMETER METHOD EPUB!
Three wattmeter method. Fig. 2: Connection diagram to measure the three-phase power with three wattmeters. To perform an accurate measurement to three-phase power installations the power of all three individual phases must be measured. Therefore three wattmeters are necessary who each measure the power of one phase. There are three methods in measuring wattage, the one, two and three wattmeter methods. The two wattmeter method is commonly used on three-phase loads. This enables the measurement of a DC bus or a different frequency single phase input on channel 3, i.e. 4 phase measurement using 3 wattmeters. 3 Phase 2 Wattmeter measurements can cater for both balanced and unbalanced loads, the method is proven when considering Kirchhoff's laws.
|Published:||22 March 2016|
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Additional calculations then show the accurate per-phase power across all three phases as if all three-phases were measured directly.
Solved: The two-wattmeter method is used to measure the power d |
However, it does not calculate the power in each phase of the winding—understanding the power in each phase calls for a mathematical conversion. Figure 1 shows the two measured voltages and currents when using the two-wattmeter method left and when using a three-wattmeter method using two wattmeter method voltage measurements right.
Two-wattmeter method voltage and current pairs left and three-wattmeter method voltage and current pairs right The two-wattmeter method uses two voltage measurements two wattmeter method to the same phase line and the two currents flowing into that phase.
The two wattmeter method is that the three-phase system is balanced, i. SAVE In electrical engineering, a wattmeter is a device used to measure the amount of electric power in watts in a given circuit.
There are three methods in measuring wattage, the two wattmeter method, two and three wattmeter methods. The two wattmeter method is commonly used on three-phase loads or circuits. The two wattmeter method measures the current in two of the three lines and two voltages from the said lines with respect to the third line.
From there the total power of the lines, regardless of balance of current, voltage or load variations, can be accurately derived. Instantaneous two wattmeter method difference across the potential coil of Wattmeter, W1 is given as Instantaneous power measured by the Wattmeter, W1 is The instantaneous current through the current coil of Wattmeter, W2 is given by the equation Instantaneous potential difference across the potential coil of Wattmeter, W2 is given as Instantaneous power measured by the Wattmeter, W2 two wattmeter method Therefore, the Total Power Measured by the Two Wattmeters W1 and W2 will be obtained by adding the equation 1 and 2.
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- Two Wattmeter Method
Where P — the total power absorbed in the three loads at any instant. The instantaneous current through the coil of the Wattmeter, W1 is given by the equation Instantaneous Power measured by the Two wattmeter method, W1 will be Therefore, the instantaneous power measured by the Wattmeter, W1 will be given as The instantaneous current through the current coil of the Wattmeter, W2 is given as The instantaneous potential difference across the potential coil of Wattmeter, W2 is Therefore, the instantaneous power measured by Wattmeter, W2 will be Hence, to obtain the total power measured by the Two Wattmeter the two equations, i.