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Experiment No

The document outlines an experiment focused on designing and testing a Star-Delta (Y-Δ) starter for a three-phase induction motor using magnetic contactors and interlock circuits. The objectives include minimizing starting current, ensuring safe transitions between configurations, and evaluating operational characteristics. Successful implementation demonstrated reduced starting current and reinforced key concepts in motor control systems.

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kingmahim725
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30 views2 pages

Experiment No

The document outlines an experiment focused on designing and testing a Star-Delta (Y-Δ) starter for a three-phase induction motor using magnetic contactors and interlock circuits. The objectives include minimizing starting current, ensuring safe transitions between configurations, and evaluating operational characteristics. Successful implementation demonstrated reduced starting current and reinforced key concepts in motor control systems.

Uploaded by

kingmahim725
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
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Experiment No:

07
Experiment Name:
Design, formation and testing of a “Y- Starter for 3phase MOTOR” using magnetic contactor
and interlock circuit
Objective:
1. To design and construct a Star-Delta (Y-Δ) starter circuit for a three-phase induction motor
utilizing magnetic contactors, timers, and overload protection relays.
2. To implement both electrical and mechanical interlocking systems to ensure safe and
sequential switching between the star and delta modes.
3. To evaluate the operational characteristics of the Y-Δ starter, including transition timing,
starting current behavior, and the effectiveness of protective mechanisms during motor
startup.
Theory:
The Star-Delta (Y-Δ) starter is a conventional method employed to minimize the high inrush
current typically observed during the startup of a three-phase induction motor. Initially, the motor
windings are connected in a star configuration, applying a reduced voltage to limit starting
current. After a predefined interval, the connection transitions to a delta configuration to enable
full voltage operation. This switching is facilitated using three magnetic contactors, a timer, and
a series of interlock circuits that ensure mutual exclusivity between the star and delta states. The
Y-Δ starter significantly reduces electrical and mechanical stress on the motor during startup,
thereby extending its service life. Additionally, the system integrates an overload relay for
safeguarding the motor against excessive current.
Apparatus:
1. MCB
2. Motor (3-phase)
3. Magnetic Contactor
4. Power
Circuit Diagram:
Discussion:
The experiment involved the successful design, assembly, and evaluation of a Star-Delta starter
for a three-phase induction motor. The incorporation of magnetic contactors, a timing
mechanism, and interlock circuits provided a secure and efficient transition between the star and
delta configurations. Experimental observations indicated a substantial decrease in the initial
starting current, validating the functionality and advantages of the Y-Δ starting method. The
practical implementation reinforced core concepts in industrial motor control systems and
emphasized the critical role of precise wiring, accurate timing, and protective circuitry in
ensuring operational reliability and motor longevity.

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