Scribd
Upload
382 views3 pages

Experiment # 01: Verification of Star/delta Load Transformation Using Resistive Load

This document describes an experiment to verify star-delta load transformations using resistive loads. The experiment involves connecting resistors in both delta and star configurations. Measurements of currents and voltages are taken in each configuration and compared to theoretical calculations. Star-delta transformations allow simplifying analysis of electrical networks by establishing equivalence between configurations with three terminals and no sources. The key equations for transforming between star and delta loads using resistances are provided.

Uploaded by

Abdul Moeez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
382 views3 pages

Experiment # 01: Verification of Star/delta Load Transformation Using Resistive Load

This document describes an experiment to verify star-delta load transformations using resistive loads. The experiment involves connecting resistors in both delta and star configurations. Measurements of currents and voltages are taken in each configuration and compared to theoretical calculations. Star-delta transformations allow simplifying analysis of electrical networks by establishing equivalence between configurations with three terminals and no sources. The key equations for transforming between star and delta loads using resistances are provided.

Uploaded by

Abdul Moeez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 3

Experiment # 01

1. Objective
Verification of Star/delta load transformation using Resistive load.
Apparatus Required

Resistors (various values)

Variable resistors

Variable Power supply

Digital Multi-meter

Bread board, Jumper wire

2. Circuit Diagram

Fig.1.1: Star Y-Network

Fig.1.2: Delta -Network

Fig.1.3: Resistors in delta-connection

Fig.1.4: Resistors in star-connection

3. Conceptual Background
Star-Delta transformation is a mathematical technique to simplify the analysis of an
electrical network. The transformation is used to establish equivalence for networks with 3
terminals. Where three elements terminate at a common node and none are sources, the node is
eliminated by transforming the impedances. For equivalence, the impedance between any pair
of terminals must be the same for both networks and hence the current through any pair of
nodes must be same for both networks (Refer fig 1.1 & 1.2). The equations given here are valid
for real as well as complex impedances.
Referring figure 1.1 and figure 1.2, following are the equations for transformation from load to Y-load:

R
1

Ra Rb
Ra Rb Rc

Rb Rc
2
Ra Rb Rc

R3

Rc Ra

Ra Rb Rc
Following are the equations for transformation from Y-load to -load:
R R1R2 R2 R3 R3 R1
a
R2
R R1R2 R2 R3 R3 R1
b
R3
R R1R2 R2 R3 R3 R1
c
R1

4. Procedure
a) Compute all readings theoretically and fill column labeled Calculated in
table 1.1 & table 1.2.
b) Connect the circuit as shown in fig 1.3.
c) Use a DMM to measure the voltage Vab and enter in Table 1.1.
d) Use a DMM to measure the currents I1, I2 , IT and Iab, and enter in Table 1.1.
e) Connect the circuit as shown in fig 1.4 and adjust Ra to 1 k
f) Use a DMM to measure the voltage Vab and enter in Table 1.2
g) Use a DMM to measure the currents I1, I2 and IT and enter in Table 1.2
h) Adjust the variable resistor and repeat steps (e) and (f).
5. Observation and Calculations
Calculated

Measured

I1
I2
IT
Iab
Vab
Table 1.1 - Resistors in delta-connection

Var resistor Ra = 500 Var resistor Ra = 820

Var resistor Ra = 1k

Calculated Measured Calculated Measured

Calculated Measured

I1
I2
IT
Vab
Table 1.2 - Resistors in star-connection

You might also like