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Control Protection Relays

NameDescription

21 - MHO Distance Relay

This block models a generic MHO phase distance element with 2 protection zones. 
25 - Synchronism-Check RelayThis block models a generic 25 synchronism-check or sync-check relay. 

27 - Undervoltage Relay

The under-voltage relay (27) operates when the voltage it monitors falls below a set of threshold values. 

27 - Undervoltage Relay (1-ph)

This component is a single phase under-voltage (27) relay with voltage magnitude as the input.

40Q - Loss-of-Excitation Relay

The Var-type loss-of-excitation relay (40Q) operates when the reactive power that a synchronous generator consumes from the system exceeds the threshold. 

49M - Thermal Overload Protection for Motors

This block models a 49M - Thermal overload protection function for motors.

50-51 - Overcurrent Relay

This relay comprises functionalities of the 50P (instantaneous or definite-time), 51P (inverse-time) and 51G (inverse-time) elements. 

50 - Instantaneous or Definite Time Overcurrent Relay (1-ph)

This component is a instantaneous or definite time overcurrent (50P) relay with current magnitude as the input.
50BF - Breaker Failure ProtectionThis relay detects a breaker failure to operate during fault and thus issues a back-up trip command to adjacent circuit breakers.
51 - Inverse Time Overcurrent (1-ph)This component is a single phase inverse time overcurrent (51P) relay with current magnitude as the input.

59 - Overvoltage Relay

The over-voltage relay (59) operates when the voltage it monitors exceeds a set of threshold values. 

59 - Overvoltage Relay (1-ph)

This component is a single phase overvoltage (59) relay with voltage magnitude as the input.
67 - Directional Overcurrent RelayThe directional overcurrent relay (50-51-67) trips if and only if the fault current magnitude is above the threshold (50-51) and it is in a specific direction (67). 
67 - Directional Relay Based on ImpedanceThe 67 directional relay can detect the direction of the input current using impedance and torque which are calculated for their respective elements.
79 - Auto recloserThis relay issues a close breaker command in a power system to restore services after a transient line fault.

81 - Frequency Relay

This frequency relay (81) includes three types of frequency elements, namely the overfrequency (81O), the under-frequency (81U) and the rate-of-change-of-frequency (ROCOF) (81R) elements. 

87T - Transformer Differential Relay

This model implements a transformer differential relay (87T) with harmonic restraint and harmonic blocking functions. 

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