From Gen


50/51 - Overcurrent relay 67 50G - Ground overcurrent relay

86 - Lockout-trip 52

27/59 - Undervoltage/ PT

over voltage relay CT

81 - Under-frequency relay F

25 - Automatic synchronizer R 46 - Current unbalance relay

Directional overcurrent relay


Potential transformer Current transformer Fuse

Low-resistance grounding resistor

Fig. 28-19 Minimum Protective Relay Scheme for Utility System Main Breakers for Figure 28-18 Circuit. Source: Automatic Switch Company

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