Classification protective relays

Classification protective relays

Need and Importance of Protective Systems Causes and Effects of Faults & Faults in a System In a Year Types of Faults Fault Statistics Basic Trip Circuit Zones of protection (Protective Zones) Primary and Back-up protection Types of Back-Up Relay Principles Under-laying Back-up Protection Essential Quantities of Protection (Basic fundamental requirements) Classification protective relays Classification of Protective Schemes Basic Relay Terminology Role of Engineers

Introduction of Protection of Medium Voltage Transmission Line Over-Current Relay Time – Current Characteristics Theory of Torque Formation Important terms of connection with relays. Calculation of Relay Operating Time Overcurrent Protective Schemes Induction Relay Induction Type Directional Power Relay or Reverse Power Relay Induction Type Directional Over-current Relay Induction Type Non-Directional Over-current Relay Applications of Over-current Protection Relays Comparison of Directional O/C Relay & Power Relay (self) Drawbacks of Overcurrent Relays Relays Used in Over-current Protection Numerical On Over-current Relay

Introduction of High Voltage Line Protection

Classification protective relays

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Table 1.3 (a) and (b) shows the classification of protective relays based on the technology they use for their construction and operation and the duty they are required to perform i.e. based on their function and classification of protective schemes used for protection of a modern power system.

Table 1.3 (a) Classification protective relays (b) Classification protective schemes

Sr. No.	Protective relays			Sr. No.	Protective schemes
		Based on Technology	Based on Function		—-----------------------
1	Electromagnetic relays		Over-current relays	1	Over-current protection
2	Static relays		Under-voltage relays	2	Distance protection
3	Microprocessor based relays		Impedance relays	3	Carrier-current protection
4	—----------		Under-frequency relays	4	Differential protection
5	—--------------		Directional relays		—-----------

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Classification protective relays

General Philosophy of Protective Relaying

Protection of Medium Voltage Transmission Line (Over-Current Protection)

High Voltage Line Protection

Classification protective relays