Power System Fault Analysis Module
This module offers a comprehensive introduction to fault analysis in power systems, covering both balanced and unbalanced faults. It begins with the fundamentals of the per unit system, development of impedance diagrams, and network reduction techniques to calculate three-phase fault levels. Star equivalent circuit for three-winding transformers is explained. Next, unbalanced fault analysis through symmetrical components is introduced. The relationship between phase and sequence quantities is given, along with the development and interconnection of sequence networks for line-to-ground faults. Special attention is given to the representation of star-star and delta-star transformers in the zero- sequence network. Key concepts are reinforced with numerical examples throughout the module.
INR 7000/-
INR 5000/-
Power System Fault Analysis Module
7 Hours of Training
The Three Pillars of Power System Analysis: Load Flow, Short Circuit, and Stability Studies
This module focuses on Short Circuit Analysis, introducing the fundamental concepts required to analyze both balanced and unbalanced faults in power systems.
In this module, you will learn:
1. Per Unit System in Power System Analysis
Importance of the per unit system for analyzing large networks
Definition of Base and per unit quantities
Per unit impedance calculations for overhead lines, cables, transformers, synchronous and induction machines
2. Balanced Fault Analysis -1
Steps involved in fault level calculation
Development of the impedance diagram and network reduction technique to find impedance from sources to faulted point.
Numerical examples demonstrating fault level calculations at various buses in a power plant auxiliary system
Impact of induction motor contributions based on fault location
Fault current considerations for circuit breaker rating and relay coordination studies
3. Balanced Fault Analysis -2
Converting per unit impedance values from one base quantities to another.
Concept of an infinite bus and the effect of neglecting source impedance on fault current calculations
Representation and analysis of three-winding transformer using star equivalent circuit
Numerical example involving a three-winding transformer in a faulted network
4. Unbalanced Fault Analysis and Symmetrical Components
Ground fault current magnitudes for various neutral grounding methods o Introduction to symmetrical components for unbalanced fault analysis
Definitions of positive, negative, and zero sequence components
Role of the operator ‘a’ and the transformation matrix between phase and sequence components
Numerical example demonstrating extraction of sequence components from phase values and geometric reconstruction o Relationship between open-delta PT voltage, neutral current, and zero sequence components
5. Development and Use of Sequence Networks
Representation of voltage sources in the positive sequence network
Modelling Neutral Grounding Resistor or Reactor (NGRs) in the zero- sequence network
Sequence network interconnection for Line-to-Ground (L-G) faults o Numerical example showing ground fault current and healthy phase voltages for both solidly grounded and NGR-grounded systems
6. Transformer Representation in Zero Sequence Networks
Zero sequence modelling of Star-Star and Delta-Star transformers
Current distribution based on the Ampere-Turns Balance Principle
Behavior of delta connections in response to zero sequence current flow
Numerical examples evaluating fault currents with Star-Star and Delta- Star transformer connections
7. References for Further Reading
Duration: 7 Hours
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Sample Notes For This Module
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