Electrical Faults

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  • Fees : 2900 $
  • Date 13 Jan 2019
  • Location Abu Dhabi, English
 

Electrical Faults

 

Objective:

 

The objective of this course is to introduce to the trainees the types and causes of the different faults in power systems. The nature of the different causes and the methods to elevate such courses are also presented. The tools of analysis are to be addressed and discussed. Along with the faults, system behavior under different abnormal conditions is also presented. Many case studies are to be discussed with the trainees.

 

Course outlines:

 

1 Power System Components and System Grounding

1.1 Introduction

1.1.1 General

1.1.2 Importance of Continuity of Supply

1.1.3 Power System Components

1.1.4 Causes of Faults

1.1.5 Types of Faults

1.2 System Grounding

1.2.1 Introduction

1.2.2 Ungrounded Generation Units & Transformers

1.2.3 Transient over Voltages in Ungrounded Systems: Generators and Transformers

1.2.4 Grounded Detection Methods for Ungrounded Systems: Generators & Transformers

1.2.5 High Impedance Grounding Systems: Generators & Transformer

1.2.6 System Grounding for Mine or Other Hazardous Type Applications

1.2.7 Low Impedance Grounding: Generator & Transformers

1.2.8 Solid (Effective) Grounding Generators & Transformers

1.2.9 Ferroresonance in 3-Phase Power Systems: Distribution Systems

1.2.10 Ferroresonace in 3-Phase Power Systems: Transmission Systems

1.2.11 Arrangements of Grounding in Power Systems

1.2.12 Grounding Summary and Recommendation

1.2.13 Electric Shock and Its Effects on Humans

1.2.14 Ground Resistance

1.2.15 Transmission Line Grounds

1.2.16 Substation Grounding

 

2 Analysis of Power Generation & Transformer Systems and Analytical Tools for Fault Analysis

2.1 Power Generation Systems

2.1.1 General

2.1.2 Factors Affect the Fault Current Contribution & Continuity of Supply

2.1.3 Relation Between Substation Equipments Connections and the Fault Contribution

2.2 Transformers

2.2.1 Vector Group

2.2.2 Parallel Transformers with Different Vector Groups

2.2.3 Grounding Transformers

2.2.4 Common & Separate Grounding Resistance (High & Low Values)

2.3 Fault Calculations

2.3.1 System Configuration

2.3.2 Per-Unit Values

2.3.3 Symmetrical Components

2.3.4 Symmetrical & Unsymmetrical Fault Calculations

2.3.5 Short Circuit Level

2.3.6 Effect of Induction Machines on Short Circuit Level

2.3.7 Rupture Capacity of Circuit Breakers

2.3.8 Methods To Reduce the Short Circuit Level & Peak Current Limiters

2.3.9 Numerical Examples

2.4 Fault Analysis in Power Generation Plants

2.4.1 Generation Plants Outline

2.4.2 Types of Electrical Faults in Generating Plants

2.4.3 Methodology of Generator Fault Analysis

 

3 Mal & False Operation of Common Protective Relays Which Leads To Power System Disturbances

3.1 Introduction

3.2 Directional & Non-Directional over Current and Earth Fault Relays

3.3 Sensitive Earth Fault, Differential & Restricted Earth Fault, Directional and Distance Relays

3.4 Gas Actuating Relays

3.4.1 Buchholz Relay

3.4.2 Sudden Pressure Relays

3.5 Over Fluxing Relays

3.6 Case Study

3.6.1 A Case of a False Operation for an Out–Of–Step Relay (OS)

3.6.2 A Case of a False Operation of a Circuit Breaker

 

4 System Behaviour due to some Abnormal Operational Conditions

4.1 Introduction

4.2 Shortage of Active Power & Frequency Deviation

4.3 Shortage of Reactive Power

4.3.1 Introduction

4.3.2 Voltage Deviations & Voltage Rise

4.3.3 Voltage Stability and Voltage Collapse with Case Studies

4.4 Maintenance Management and Fault Forecast

4.4.1 Maintenance Strategies

4.4.2 Fault Forecast (Fault Detection)

 

5 Faults due to Unavoidable Causes and Network Improvement

5.1 Faults due to the Following External & Internal Influences

5.1.1 Lightning

5.1.2 Switching

5.1.3 Pollution

5.1.4 Harmonics

5.2 Network Performance Evaluation

5.3 Cause of Blackouts in Electrical Networks

5.4 Blackout in Power Systems

5.5 Preventive Measures of Blackout ( Network Improvement Methods)

5.6 Case Studies Discussions

 

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