Index

1- Power System Principals

2- Power System Faults

 * Part1
 * Part 2

3- Instrument Transformers 

 * (3-A) Current Transformer

  1 - Measuring And Protection Cores Of Current Transformer
  2 - Open Circuit Current Transformer.

 * (3-B) Voltage Transformer

4- DC System

 * DC-Earth Fault Alarm Device

5- Protection Relays

 * (5-A) Over Current Protection

  1 - Definite Time Over Current Relay
  2 - Inverse Time Over Current Relay
  3 - Direction Over Current Relay

 * (5-B) Earth Fault Relay

  1 - Directional Earth Fault Relay

 * (5-C) Transmission Line Protection

  1 - Distance Relays
  2 - Directional Impedance Relay Characteristics
  3 - Mho Characteristic
  4 - Multi-Stage Distance Relay
  5 - Quadrilateral Characteristics
  6 - Under Reach
  7 - Over Reach
  8 - Distance Protection Schemes

• (5-D) Power Swing

• (5-E) Differential Relays

1. Biased differential relay
2. Practical Example of Differential Relay
3. Tripping Characteristics and Harmonic Restrain
4. Differential Relays And Inrush Current

• (5-F) Restricted Earth Fault

6- Mechanical Protection

• Buchholz Relays
• Winding Temperature Indicator
• Oil Temperature Indicator
• Pressure relief

7- Bus Bar Protection

• Practical Example Of Bus Bar Protection
• Tripping Circuit of Bus Bar Protection

8- Breaker Failure

9- Parallel Operation Of Power Transformers

• Parallel operation with different voltage ratios
• Parallel operation with different vector group
• Parallel operation with different % impedances

Tweet