Three phase power measurement using 2 wattmeter 1. Some of the added advantage of this method is that we can calculate 3 phase reactive power and power factor of load as well.
Three Phase Signals Part Iv Delta Mesh Connection Delta Delta Connection Connection
Three Phase Three-Wire Connection Two Wattmeter Method Where three wires are present two wattmeters are required to measure total power.
. By subtracting W 1 wth W 2 we get Dividing equations 2 and 1 we get Therefore power factor Power measurement in a 3-phase system using one wattmeter can be done only when the load is balanced. To measure three phase power using two wattmeter method. The resultant sum of all the readings of wattmeter will give the total power of the circuit.
The connection diagram for the measurement of power in three phase power measurement circuit using two wattmeters method is shown in figure 1. The apparatus is known as two wattmeters each of which is able to measure the current and voltage on one phase of a 3-phase 3wire electrical system. Figure 2 Three watt meters connected to monitor power taken by a three-phase load.
When the two wattmeters are connected to a delta or ungrounded wye 3-phase system they can measure the current flowing in two of the three phases and voltage of two of the line-line phases. The power in a three phase load can be measured by following methods. The reading of wattmeter one can be written as P1 -V3 I1 I3 and reading of wattmeter two is P2 -V2 I2 I1.
Please not the connection of two wattmeters. In this slide I have explained how two watt meters can be used to measure 3 phase power. This EzEd video explains how the Two Watt Meter Method works to calculate Three Phase Power.
The power measured by the Two Wattmeter at any instant is the instantaneous power absorbed by the three loads connected in three phases. If the power analyzer requires no change in connection when switching from a two-voltage to a three-voltage method power is measured using a two-wattmeter method even if the user. 30K views View upvotes.
As the name indicates in this method two wattmeters are used to measure three-phase power. Practical on Two Wattmeter method. For a 3-ph balanced load the two wattmeter readings will besay VabIacos 30phi and VcbIc cos 30-phi.
Note that the polarity of the V A-C measurement differs between the two. 1 3 Connecting wires THEORY. C C.
So if phi 60 degrees pf less than 05 a negative reading is obtained. Figure 12 Three-phase three-wire 2 wattmeter method. Mathematically we can write Measurement of Three Phase Power by Two Wattmeters Method In this method we have two types of connections.
The voltage terminals of the wattmeters are connected phase to phase. Two-watt meter method is used for measuring power in 3 phase 3 wire star or delta connected systems either with the balanced or unbalanced load. The two-wattmeter method may be used on three-phase 3-wire systems to obtain load power values whether the load is balanced or unbalanced or star- or delta-connected but it cannot be used on a 4-wire star-connected system because a single-phase component of current might be flowing in the line and neutral having no wattmeter current-coil.
This method is generally used for the measurement of power in 3 phase 3-wire load circuits. The name of these methods indicates the number of wattmeters used in the measurement of the three-phase power. In delta connection of loads the loads are connected as.
MEASUREMENT OF THREE PHASE POWER USING TWO WATTMETER METHOD AIM. It can be used to measure power in stardelta connected load in balanced or unbalanced condition. Figure 431 shows the connection diagram for the two-wattmeter method of measuring three-.
The following is a mathematical proof of why the two-wattmeter method works on a three-wire system. Connect the wattmeters as shown in Figure 12. Using two wattmeter method the power measured by the two wattcmeters ie.
In fact this power is the average power drawn by the load since the Wattmeter reads the average power. This is irrespective of the circuit connection star or delta. The power measured by the wattmeter-1 is W1 VL IL cos 30 - 0 32 VL IL Similarly power measured by the wattmeter-2 is W2 VL IL cos 30 0 32 VL IL Hence at unity power factor both the wattmeters read half the value of total power consumed by the load ie both wattmeters read the same values.
Read more Mohammed Waris Senan Follow. Measurement of power by the two wattmeter method in star connection. Measurement of 3-Phase Power Using 2 Wattmeter Method Presented By.
A A A B. SLNO NAME OF EQUIPMENT RANGE QUANTITY 1 Testing panel 1 2 3Ï• Resistive load Bank. Total power ie the sum of the readings of two wattmeters is Measurement of Power Factor Using One Wattmeter Method.
In general m-phase power can be measured by means of m 1 wattmeters. The circuit may be taken as balanced or unbalanced one balanced type being only a special case. At Half Power Factor Lagging.
Content of the presentation Objectives Learning Outcome List of Equipment Circuit Diagram Theory Data Table 3. Figure 7 right for a three-wattmeter measurement using three line-line voltages. We get total power as PV1I1V2I2V3I3.
This is the most popular method among the three. The method is valid for both balanced and unbalanced circuits with either the load or the source unbalanced. Clearly each wattmeter will give reading as product of phase current and line voltage which is phase power.
But V1V2V30 hence expression for total power is PV1I1V2I2V3I3. A wattmeter is an equipment used to measure power in a circuit. The method of measuring two of the currents and two of the voltages is known as the two- watt meter method.
Shaheen Hawlader BSc in EEE Green University of Bangladesh 2. It is a very common principle to measure three phase powerThe explanati. Let us discuss the two wattmeter method for 3 phase power measurement with star and delta connection in detail.
B N. In this video we have shown how to measure three phase power by using two wattmeter. This is known as the two-wattmeter method of measuring three-phase power.
So if this angle becomes more than 90 degrees the the reading of the wattmeter will be negativeThis could happen in a 3-ph unbalanced circuit.
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