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The power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when the
- a)load is balanced
- b)load is unbalanced
- c)3-phase load is connected to source through 3-wires
- d)3-phase load is connected to source through 4-wires
Correct answer is option 'C'. Can you explain this answer?
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The power delivered to a 3-phase load can be measured by the use of 2 ...
Explanation:
The power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when the 3-phase load is connected to the source through 3-wires. This is because in a 3-phase, 3-wire system, the three phases are balanced and the neutral wire is absent.
Here are some reasons why this is the case:
- A balanced load means that each phase draws the same amount of power. This makes it possible to use two wattmeters to measure the total power delivered to the load.
- In a 3-phase, 3-wire system, the neutral wire is not present. This means that the voltage measured between any two phases is equal to the line voltage. As a result, the two wattmeters can be connected between any two phases to measure the power.
- In a 3-phase, 4-wire system, the neutral wire is present. This means that the voltage measured between any two phases is not equal to the line voltage. As a result, the two wattmeters cannot be connected between any two phases to measure the power.
In summary, the power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when the 3-phase load is connected to the source through 3-wires.
The power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when the 3-phase load is connected to the source through 3-wires. This is because in a 3-phase, 3-wire system, the three phases are balanced and the neutral wire is absent.
Here are some reasons why this is the case:
- A balanced load means that each phase draws the same amount of power. This makes it possible to use two wattmeters to measure the total power delivered to the load.
- In a 3-phase, 3-wire system, the neutral wire is not present. This means that the voltage measured between any two phases is equal to the line voltage. As a result, the two wattmeters can be connected between any two phases to measure the power.
- In a 3-phase, 4-wire system, the neutral wire is present. This means that the voltage measured between any two phases is not equal to the line voltage. As a result, the two wattmeters cannot be connected between any two phases to measure the power.
In summary, the power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when the 3-phase load is connected to the source through 3-wires.
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Community Answer
The power delivered to a 3-phase load can be measured by the use of 2 ...
2 wattmeter method is used for balanced and unbalanced load but in the given option both are given in two options so we can choose next options then the three phase power is measured by three wire two wattmeter method. the coil named as voltage coil and current coil.so option c is correct
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The power delivered to a 3-phase load can be measured by the use of 2 wattmeters only when thea)load is balancedb)load is unbalancedc)3-phase load is connected to source through 3-wiresd)3-phase load is connected to source through 4-wiresCorrect answer is option 'C'. Can you explain this answer?
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