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The University of Lahore, Islamabad Campus Course: Power System Protection Lab Work Sheet 4

This document provides instructions for a lab experiment on modeling a protection scheme using a circuit breaker in MATLAB Simulink. Students are asked to complete all lab activities and tasks, get them checked by the lab engineer, and submit any home tasks before the next lab. The tasks involve designing and building a circuit of a circuit breaker in the Simulink library, and implementing a three-phase system using Simpower system tools. Late submissions will result in deduction of marks.

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Hayat Ansari
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41 views6 pages

The University of Lahore, Islamabad Campus Course: Power System Protection Lab Work Sheet 4

This document provides instructions for a lab experiment on modeling a protection scheme using a circuit breaker in MATLAB Simulink. Students are asked to complete all lab activities and tasks, get them checked by the lab engineer, and submit any home tasks before the next lab. The tasks involve designing and building a circuit of a circuit breaker in the Simulink library, and implementing a three-phase system using Simpower system tools. Late submissions will result in deduction of marks.

Uploaded by

Hayat Ansari
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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THE UNIVERSITY OF LAHORE,ISLAMABAD CAMPUS

COURSE: POWER SYSTEM PROTECTION


Lab Work Sheet 4

Student Name:________________

Reg No: _____________________

Date: _______________________

Marks obtained: ____________________

Checked date: _______________

Instructions:
 Complete all activities in lab and get checked by the lab engineer.
 Home task should be completed before next lab and must checked by the lab engineer.
 At the end of all activities and home task students advised to write a summary in their own words.
 Late submission will lead to deduction of marks.
 Date must be properly mentioned.
LAB EAXPERIMENT NO: 4
(PLO: 5 (Modern Tool Usage))

MODELING PROTECTION SCHEME USING CIRCUIT BREAKER

OBJECTVE:
 Understand the behavior of Circuit Breaker.
 Design and make the circuit of Circuit Breaker on Matlab Simulink Library.

INTRODUCTION:
In A circuit breaker is an automatically operated electrical switch designed to protect an
electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a
fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be
replaced, a circuit breaker can be reset manually or automatically to resume normal operation.
Circuit breakers are made in varying sizes, from small devices that protect an individual
household appliance up to large switchgear designed to protect high voltage circuits feeding an
entire city.

Types of circuit breakers:

 Low-voltage circuit breakers


Low-voltage (less than 1,000 VAC) types are common in domestic, commercial and industrial
application
 Sulfur hexafluoride (SF6) circuit breakers
A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to
quench the arc. They are most often used for transmission-level voltages and may be
incorporated into compact gas-insulated switchgear.

 Vacuum circuit breaker


A vacuum circuit breaker is such kind of circuit breaker where the arc quenching takes place in
vacuum. The technology is suitable for mainly medium voltage application.

 Oil circuit breaker


Mineral oil has better insulating property than air. In oil circuit breaker the fixed contact and
moving contact are immerged inside the insulating oil. Whenever there is a separation of current
carrying contacts in the oil, the arc in circuit breaker is initialized at the moment of separation of
contacts, and due to this arc the oil is vaporized and decomposed in mostly hydrogen gas and
ultimately creates a hydrogen bubble around the arc. This highly compressed gas bubble around
the arc prevents re-striking of the arc after current reaches zero crossing of the cycle. The oil
circuit breaker is the one of the oldest type of circuit breaker
LAB TASK LAB 04
(PLO: 5 (Modern Tool Usage))

Using Simpower system tool and implement the three phase system as shown in figure below

LAB TASK 01: (5 MARKS)


LAB TASK 02: (5 MARKS)

RESULTS:

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