Short circuit fault level - Fault current calculation. Tutorial 9

In this tutorial we solve a power system network having a 3 phase symmetrical fault on one of the Bus bar. The Principle approach is to determine the impedance diagram and then use it to apply basics circuit theory to trace the path taken by the short circuit current.
Master the essentials of short circuit fault level calculations in this detailed tutorial. Perfect for electrical engineers and power system analysts, this video provides a comprehensive guide to understanding and calculating the fault levels in electrical systems. Learn the principles, methods, and practical applications to ensure effective and reliable power system design and protection.

Topics in this tutorial include.
- Transmission lines Impedance
- Delta star transformers
- Short circuit current limiting
- Per unit system
- Impedance diagram

🔧 What You’ll Learn:
Introduction to Short Circuit Faults
Importance of Fault Level Calculations
Step-by-Step Calculation Methods
Practical Examples and Applications
Ensuring System Safety and Reliability

📌 Key Topics Covered:
Understanding Short Circuit Faults
Significance of Fault Level Calculations
Step-by-Step Guide to Calculating Fault Levels
Practical Calculation Examples
Application of Fault Level Calculations in System Design
Best Practices for Accurate Calculations

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🔗 Related Videos:
If you are not familiar with per unit system please watch the following tutorial to help you understand.

Tutorial 1: Per-unit system calculations Part 1 - Electrical Protection

Tutorial 2: Per-Unit Calculations Part 1 - Electrical Protection

Tutorial 7 - per unit reactance of a transformer ( electrical network upgrade)

Tutorial 8 - How to generate the per unitized Impedance diagram of a power system network

Understanding Overcurrent Protection in Power Systems
Load Flow Analysis with DigSilent PowerFactory
Basics of Protective Relay Coordination

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[diegoleon]

Good morning engineer, I would like to ask you a question about this exercise, I am asked how to calculate the three phase short circuit currents in bus 2, with fault impedances of 3 Ω, this would be posed with the same formula of Isc= Ip.u. x I line (Iline=Sbnew/sqrt(3) Vb(zone)), I fail to understand what would be referred to those 3Ω fault impedances. it is the same exercise only that my professor adds that concept. for example, how do you get a short circuit current and a fault current is it the same thing? thanks a lot !

[yusuphataal]

Your videos are really helpful. Can you please do a video on fault current analysis when the system is loaded. I learned that all what you solving is an unloaded system.

[MathiasOzah-wcmt]

Good day, I noticed when solving for the Xpu(new) of generator G1 the Kvb old and Kvb new was not considered, unlike the formula you stated, could there be a reason for this?

[walterdartanay]

Good Video, but I have a doubt: G2 is 13.8 kV and T2 is 18/500, if Vbase = 18, then Xg2 would be 0.141, I do not understand why you got 0.24?