High-voltage diesel generator sets, due to their high output power and high voltage level, play a crucial role in power supply in industrial production, large public buildings, and critical infrastructure. Their operation must strictly adhere to technical specifications and safety management requirements to avoid equipment damage, power outages, or personal injury accidents caused by misoperation.
Before starting, a comprehensive inspection of the generator set and its surrounding environment should be conducted. Confirm that the fuel, lubricating oil, and coolant levels are within the specified range and that the oil quality meets requirements; check that the high-voltage cables, terminals, and grounding devices are intact and undamaged, and that the insulation layer is free from aging or damage; ensure that the circuit breakers and disconnect switches in the control cabinet are in the open position to prevent accidental energization. Check that the ventilation, smoke extraction, and fire-fighting equipment in the engine room or installation location are complete and effective, and maintain a safe distance from live parts.
The starting process should follow the sequence of "low voltage first, then high voltage." First, perform a self-test on the control panel to confirm there are no alarm signals. Then, close the low-voltage auxiliary power supply, start the cooling and lubrication system, and wait for the oil and water temperatures to rise to the appropriate range before starting the diesel engine. After the engine reaches its rated speed and operates stably, the high-voltage output circuit breaker can be gradually closed to connect the unit to the power distribution network or operate it under load. During grid connection, the phase sequence, voltage, and frequency must be verified to ensure consistency and prevent inrush current from damaging equipment or affecting grid stability.
During operation, instruments and monitoring systems should be monitored regularly, paying particular attention to output current, voltage, frequency, power factor, and engine operating parameters. Any abnormalities should be analyzed immediately and appropriate measures taken. High-voltage systems must be strictly protected from being switched on or off under load. Any switching operations should only be performed after confirming load transfer or a state of no current, and must be carried out by a certified electrician wearing protective insulated equipment.
When shutting down, the high-voltage load should be removed first, the high-voltage output circuit breaker opened, and the unit allowed to run unloaded for several minutes to cool down. Then, the diesel engine and auxiliary systems should be shut down sequentially, and finally, the low-voltage power supply disconnected. After shutdown, check all parts for leaks and signs of overheating, and complete the operation record and shift handover instructions. For long-term shutdown, proper storage and maintenance are required, with periodic start-up and trial runs to prevent insulation from becoming damp and moving parts from corroding.
The operation of high-voltage diesel generator sets must be based on professional training and strict procedures. Only by following the procedures and paying attention to details can the advantages of high-power power supply be fully utilized and the safety of personnel and equipment be ensured.
