Electrical Power Systems Protection Course

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Electrical Power Systems Protection Course

About This Class

This three-day course will focus on design of transmission and distribution protection schemes utilizing advanced and highly reliable technology. This will include fundamentals on protection, relay design and protection schemes for transmission lines, transformers and bus.

Additionally, the course will focus on settings of feeder and transformer protection schemes, and selection of current and voltage instrument transformers for those protection schemes.

Issues surrounding power quality and their effect on power systems will also be addressed. This will include measurement and modelling techniques to identify power quality problems and mitigating techniques. Impact of electrical overstress on the design and operation of power systems and electronic equipment will be discussed and protection systems will be modelled to eliminate equipment malfunction and damage due to electrical overstress.

Local Fee

R 17,999

International Fee

$ 1,300

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Why You Should Attend

By the end of the course attendees will:

Significantly improve your site’s transmission and distribution reliability while avoiding endangering the lives of workers and the general public, as well as preserving company assets
Recognize different fault types in electrical power system networks
Perform more informed decisions on fault and design calculations

Day 1

Need for protection

• Selectivity, stability, sensitivity, speed, reliability, dependability, security

Fault types and their effects

• Active, incipient, passive, transient, asymmetrical
• Phase & earth faults

Simple calculation of short circuit currents

• Revision of simple formulae
• Calculation of short circuit MVA & fault currents
• Worked examples

System Earthing

• Solid, impedance, touch potentials
• Effect of electric shock
• Earth leakage protection

Lightning and Lightning Protection

• Physics of Lightning
• Electrical Surges due to Lightning
• Lightning Waveforms
• Lightning Protection Systems (Evaluation and Selection)
• Lightning Protection of Electricity Supply Systems
• Lightning Protection for Buildings

Instrument Transformers

• Current transformers: construction, performance, specification, magnetization, curves
• Voltage transformers: types, accuracy, connections

Day 2

Circuit Breakers

• Purpose & duty, clearance times, types

Tripping Batteries

• Battery types, chargers, maintenance, D.C. circuitry

Relays

• Inverse definite minimum time (IDMT) relay
• Construction principles and setting
• Calculation of settings – practical examples
• New Era – modern numerical relays & future trends

Practical demonstrations and sessions

• Including simple fault calculations and relay

Co-ordination by time grading

• Problems in applying IDMT relays

Low Voltage Networks

• Air & molded circuit breakers
• Construction and installation
• Protection tripping characteristics
• Selective co-ordination (current limiting, earth leakage protection, cascading)

Principles of unit protection

• Differential protection – basic principles

Day 3

Feeder Protection

• Cables
• Pilot Wire Differential
• Overhead Lines
• Distance Protection (basic principles, characteristics, various schemes)

Transformer Protection

• Phase Shift, Magnetising in-rush, inter-turn, core & tank faults
• Differential & Restricted Earth Fault Schemes
• Bucholz Relay, Oil & Winding Temperature
• Oil – Testing & Gas Analysis

Switchgear (Busbar) Protection

• Requirements, Zones, Types
• Frame Leakage
• Reverse Blocking
• High, Medium & Low Impedance Schemes

Motor Protection

• Thermal overload, time constraints, early relays, starting & stalling conditions
• Unbalanced supply voltages, negative sequence currents, de-rating factors
• Phase faults protection
• Earth Faults – core balance, residual stabilising resistors

Generator Protection

• Stator & rotor faults
• Overload & over-voltage
• Reverse power, unbalanced loading
• Loss of excitation and synchronism
• Typical protection scheme for industrial Generators

Overhead Line Protection

• Basic principles of the distance relay
• Tripping characteristics
• Application onto power lines
• Effect of load current & arc resistance
• Various schemes using power line carrier

Management of Protection

• Routine & annual testing, investigation and performance assessment, upgrading

Who should attend

The course will be most relevant to those occupying the following positions:

Electrical Engineers / Project Engineers / Design Engineers
Electrical Maintenance Engineers / Electricians
Electrical Technicians / C & I Engineers
Field Technicians / Electrical Foremen
Control & Instrumentation Engineers

Professor J. Walker is the director of a technologies company that specializes in consultation on High Voltage insulation testing as well as the supply of test equipment for High Voltage applications. He is a Doctor of Technology graduate from the Vaal University of Technology, completed in 2005 with a thesis titled “Diagnostic Evaluation of Water Tree Aged XLPE-Insulated Cables”.

He started with a Higher National Diploma in Electrical Engineering acquired at Vaal Triangle Technikon where he later worked as a lecturer in the Department of Power Engineering after completing his Bachelor of Technology Degree. In 2005 Professor Walker was appointed as Associate Professor at Vaal University, and subsequently the head of the Institute for High Voltage Studies, a position he held until his retirement the following year.

He has over the years of acquiring field and academic experience; he also published a number of articles and journals on electrical power systems, and has presented a number of papers at local and international conferences.