What are generator protections? How are they used? What typical protections are found on a diesel generator?

Protections for diesel generators are usually monitored by either the engine ECU (for engine based monitoring and protections) or the generator control module (for alternator and other protections). The AVR can also provide protections for some parameters. Generator protections are provided to prevent catastrophic failure of the diesel generator.

Common Protections:

• Low Oil Pressure (using a Low Oil Pressure Switch)
• High Engine Coolant Temperature (Using A Coolant temperature Switch)
• Low Oil Pressure (using an Oil Pressure Sender)
• High Engine Coolant Temperature (Using a Coolant Temperature Sender)
• Low Coolant Level Switch
• Low Fuel Level
• High Bund Alarm
• DEF Fluid Low Alarm
• Engine Under-speed
• Engine Over-speed
• Engine Speed Overshoot
• Engine Overload
• Charge Fail Alarm (from Engine Mounted DC Alternator)
• Low Battery Voltage
• High Battery Voltage
• Alternator Over Frequency
• Alternator Under Frequency
• Over Frequency Overshoot
• Alternator High Voltage
• Alternator Low Voltage
• Alternator Over Current
• Short Circuit
• Negative Phase Sequence
• Earth Fault (Using an Earth Fault CT)
• Reverse Power Alarm
• Low Load Alarm