Balanced star connected circuit measurements

In summary, a balanced star connected circuit is a type of electrical circuit commonly used in three-phase power systems. It is characterized by three equal impedances connected in a triangular arrangement, with each impedance connected to a supply line at a common neutral point. Voltage can be measured using a voltmeter or multimeter, and line and phase currents are equal in this type of circuit. Power can be calculated using a formula that takes into account the three phases and the relationship between line and phase currents. An advantage of a balanced star connected circuit is its ability to handle higher power loads and transmit three-phase power, making it more efficient and cost-effective for industrial and commercial applications.
  • #1
Steve Collins
46
0
Measure phase and line voltages.
Measure currents in the three lines and neutral.
Measure total power dissipated in the load.
Calculate total apparent power absorbed by the load.
Determine power factor.
Draw phasor showing voltages and currents.P=P1 + P2

Q = √3(P2 - P1)

|S| = √(P2+Q2)

θ = tan-1(Q/P)Measurements taken

VP = 150V

VL = 265V

IL = 2.5A

IN = 0A

P1 = 645W

P2 = 645W

So,

P = 645 + 645 = 1290W

Q=√3(645 - 645) = 0 VAR ?
 
Physics news on Phys.org
  • #2
After a brisk walk to the shops in the snow I have realized that this is a purely resistive circuit so there is no Q or power factor.
 

1. What is a balanced star connected circuit?

A balanced star connected circuit is a type of electrical circuit where three equal impedances are connected in a triangular arrangement. The three impedances are connected at a common point, known as the neutral point, and each impedance is connected to one of the three supply lines. This type of circuit is commonly used in three-phase power systems.

2. How do you measure voltage in a balanced star connected circuit?

To measure voltage in a balanced star connected circuit, you can use a voltmeter or a multimeter. Connect the positive lead of the voltmeter to any one of the three supply lines, and the negative lead to the neutral point. The voltage measured will be the line-to-neutral voltage, which is equal to the phase voltage in a balanced star connected circuit.

3. What is the relationship between line and phase currents in a balanced star connected circuit?

In a balanced star connected circuit, the line current is equal to the phase current. This is because the three impedances in the circuit are equal, and the supply lines are connected to the three points of the triangle. Therefore, the same current flows through each impedance and through each supply line.

4. How do you calculate the power in a balanced star connected circuit?

To calculate the power in a balanced star connected circuit, you can use the formula P = 3 x V x I x cosφ, where P is the power in watts, V is the phase voltage, I is the phase current, and cosφ is the power factor. This formula accounts for the three phases in the circuit and the relationship between line and phase currents.

5. What are the advantages of a balanced star connected circuit?

One major advantage of a balanced star connected circuit is that it allows for the transmission of three-phase power. This is because the three-phase voltages are balanced, meaning they are equal in magnitude and 120 degrees out of phase with each other. Additionally, a balanced star connected circuit can handle higher power loads compared to a single-phase circuit, making it more efficient and cost-effective for industrial and commercial applications.

Similar threads

Engineering Power dissipated in circuit combination
    • Engineering and Comp Sci Homework Help
Replies
6
Views
7K
Engineering Delta and star transformation of AC circuits
    • Engineering and Comp Sci Homework Help
2
Replies
43
Views
15K
Engineering 3-Phase Circuits (Wye/Delta)
    • Engineering and Comp Sci Homework Help
Replies
10
Views
4K
How do i calculate these phaors?
    • Engineering and Comp Sci Homework Help
Replies
4
Views
2K
Power of resistors in parallel vs series circuit
    • Introductory Physics Homework Help
Replies
7
Views
2K
Engineering Short Circuiting 1 of 3 coils that are Wye connected
    • Engineering and Comp Sci Homework Help
Replies
10
Views
2K
Engineering Magnetising circuit parameters in a 3ph induction motor
    • Engineering and Comp Sci Homework Help
Replies
1
Views
3K
Calculating Symmetric Components in a Three Phase 4 Wire System
    • Engineering and Comp Sci Homework Help
Replies
23
Views
5K
Calculating Three Phase Power Load: Help & Homework Statement
    • Engineering and Comp Sci Homework Help
Replies
2
Views
4K
Determining total power in a 3 phase system and star capacitance?
    • Engineering and Comp Sci Homework Help
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top