This document summarizes a presentation on power system protection given by B. Mani Kumar. It discusses components of protection systems like current and voltage transformers, protective relays, circuit breakers, and batteries. It also covers types of protection like overload protection, high voltage transmission protection, earth fault protection, and back-up protection. Finally, it discusses coordination of protective devices and performance measures like reliability, selectivity, speed, economy, and simplicity.

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A Seminar presentation
on
Power system protection
presented by
B.Mani kumar
16705A0223
under the esteemed guidance of
Mr. P. RAVNIDRA PRASAD M.Tech.,
Assistant Professor.
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
ANNAMACHARYA INSTITUTE OF TECHNOLOGY AND SCIENCE
(atonomous)
NEW BOYANA PALLI, RAJAMPET – 516 126
2016-2019

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3. • Introduction
• Components
• Protective Devices
• Types of Protection
• Coordination
• Performance Measures
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4. • Power-system protection is a branch of electrical
power engineering that deals with the protection of
electrical power systems from faults through the
isolation of faulted parts from the rest of the
electrical network.
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5. Protection systems usually comprise five
components:
• Current and voltage transformers
• Protective relays
• Circuit breakers
• Batteries
• Fuses
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6. Current & Voltage Transformer:
• Current & Voltage Transformer to step down the
high voltages and currents of the electrical power
system to convenient levels for the relay.
Current Transformer Voltage Transformer
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7. Protective Relays& Circuit Breakers
• Protective Relays to sense the fault and initiate a
trip, or disconnection.
• Circuit Breakers to open/close the system based on
relay and auto reclose commands.
Digital Relay Circuit Breakers
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8. Batteries& Fuses
• Batteries to provide power in case of power
disconnection in the system.
• Fuses for parts of a distribution system, fuses are
capable of both sensing and disconnecting faults
Batteries Fuses
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9. Functionality:
• Automatic operation, such as auto-re-closing or
system restart
• Monitoring equipment which collects data on the
system for post event analysis.
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10. There are three parts of protective devices:
• Instrument transformer
• Relay
• Circuit Breaker
Inst Transformer Relay Circuit breaker
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11. Major advantages of protective devices are:
• Safety
• Economy
• Accuracy
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12. There are several types of protection:
• Over Load
• High Voltage Transmission
• Earth Fault
• Back-Up
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13. Overload &High Voltage Transmission:
• O L: Overload protection requires a current
transformer which simply measures the current in a
circuit
• HVT:(Protection on the transmission and distribution
serves two functions)
At a basic level, protection looks to disconnect
equipment which experience an overload or a short to
earth.
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14. Earth Fault& Back-up
• Earth fault protection requires current transformers
and senses an imbalance in a three-phase circuit
• Back-Up: The objective of protection is to remove
only the affected portion of plant and nothing else
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15. • Protective device coordination is the process of
determining the "best fit" timing of current
interruption when abnormal electrical conditions
occur. The goal is to minimize an outage to the
greatest extent possible.
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16. We can measure a protection systems performance
with following:
• Reliability
• Selectivity
• Speed
• Economy
• Simplicity
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