Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Power System Protection
S.A.Soman
Department of Electrical Engineering IIT Bombay
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection
Principle
Directional Overcurrent Protection
2 Distance Protection
Principle
3 Differential Protection
Principle
For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection
Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Principle of Overcurrent Protection
When the current in a system exceeds a predetermined value, it indicates the presence of a fault.
Relaying decision is based solely on the magnitude of current.
Used in radial distribution systems.
Overcurrent relaying and fuse protection uses this principle.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Directional Overcurrent Protection
Uses both magnitude of current and phase angle information for decision making.
Used in radial distribution systems with source at both ends.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection
Principle
3 Differential Protection Principle
For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Distance Protection
The basic principle is that the apparent impedance seen by the relay reduces drastically in case of line fault.
If the ratio of apparent impedance to the positive sequence impedance is less than unity, it indicates a fault.
This protection scheme is inherently directional. Impedance relay and Mho relay use this principle.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection
Principle
For Transmission Lines For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Protection Paradigms - Apparatus Protection
Principle of Differential Protection
It is based on the fact that any fault within an electrical equipment would cause the current entering it to be different from the current leaving it.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Protection Paradigms - Apparatus Protection
Principle of Differential Protection
It is based on the fact that any fault within an electrical equipment would cause the current entering it to be different from the current leaving it.
By comparing the two currents either in magnitude or in phase or in both, fault can be determined.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars
Summary
Principle of Differential Protection
It is based on the fact that any fault within an electrical equipment would cause the current entering it to be different from the current leaving it.
By comparing the two currents either in magnitude or in phase or in both, fault can be determined.
It is an attractive option if both the ends of the apparatus are located near each other.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines
For Tapped Lines For Transformers For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines
For Tapped Lines For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines
For Tapped Lines For Transformers For Busbars
Summary
Differential Protection for Transmission Lines
Its implementation requires a communication channel. It is extremely accurate.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines
For Tapped Lines
For Transformers For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines
For Tapped Lines
For Transformers For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines
For Tapped Lines
For Transformers For Busbars
Summary
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines
For Transformers
For Busbars
Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines For Tapped Lines
For Transformers
For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines
For Transformers
For Busbars
Summary
Differential Protection for Transformer
CTs are selected in such a way that under normal conditions the scaled CT currents will match in magnitude.
Under fault condition, differential current will flow through the overcurrent relay.
Overcurrent relay pick up is set above the no load current value.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers
For Busbars Summary
1 Overcurrent Protection Principle
Directional Overcurrent Protection
2 Distance Protection Principle
3 Differential Protection Principle
For Transmission Lines For Tapped Lines For Transformers
For Busbars
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers
For Busbars Summary
Differential protection for Busbar
If the fault is external the algebraic sum of the currents entering the bus is zero.
Power System Protection S.A.Soman Overcurrent Protection Principle Directional Overcurrent Protection Distance Protection Principle Differential Protection Principle For Transmission Lines For Tapped Lines For Transformers For Busbars Summary Summary Basic Principle of Overcurrent Protection.
Directional Overcurrent Protection. Distance Protection.
Differential Protection.
