Power System Protection S.A.Soman Power System Dynamics Overview System Protection Relays Example System Underfrequency and Rate of Change of Frequency Relays Undervoltage and Reverse Power Relay Lightning Protection Lightning Overvoltages Lightning Protection Devices Summary Power System Protection S.A.Soman Department of Electrical Engineering IIT Bombay Protection Paradigms - System Protection
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Power SystemProtection
S.A.Soman
Power SystemDynamicsOverview
SystemProtectionRelaysExample System
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Power System Protection
S.A.Soman
Department of Electrical EngineeringIIT Bombay
Protection Paradigms - System Protection
Power SystemProtection
S.A.Soman
Power SystemDynamicsOverview
SystemProtectionRelaysExample System
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Protection Paradigms - System Protection
1 Power System DynamicsOverview
2 System Protection RelaysExample SystemUnderfrequency and Rate of Change of FrequencyRelaysUndervoltage and Reverse Power Relay
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Protection Paradigms - System Protection
Overview of Power System DynamicsSystem protection requires study of system dynamics andcontrol. Power system dynamics
Can be described in terms of a set of differential andalgebraic equations.
Analysis is done by EMTP.
Post fault system stability is determined by transientstability studies.
Power SystemProtection
S.A.Soman
Power SystemDynamicsOverview
SystemProtectionRelaysExample System
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Protection Paradigms - System Protection
Power SystemProtection
S.A.Soman
Power SystemDynamicsOverview
SystemProtectionRelaysExample System
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Protection Paradigms - System Protection
System Protection RelaysFollowing relays are used to detect system disturbancesand for enhancing system stability.
Under frequency and over frequency relays.
Rate of change of frequency relays.
Under voltage relays.
Reverse power flow relays.
Vector shift relays.
For example, consider a voltage distribution system withlocal generation which is synchronized with the grid. Duringgrid disturbances, the local plant generators have to beisolated from the grid.
Power SystemProtection
S.A.Soman
Power SystemDynamicsOverview
SystemProtectionRelaysExample System
Underfrequency andRate of Change ofFrequency Relays
Undervoltage andReverse Power Relay
LightningProtectionLightningOvervoltages
Lightning ProtectionDevices
Summary
Protection Paradigms - System Protection
1 Power System DynamicsOverview
2 System Protection RelaysExample SystemUnderfrequency and Rate of Change of FrequencyRelaysUndervoltage and Reverse Power Relay