The Main Cause of Volvo Generator Overheating

Volvo generators do not operate in accordance with the specified technical conditions. For example, if the stator voltage is too high, the iron loss will increase; the load current is too large, and the copper loss of the stator winding will increase; the frequency is too low, which will slow down the cooling fan speed and affect the heat dissipation of the Volvo generator; The power factor is too low to increase the rotor excitation current and cause the rotor to heat up. Check whether the indication of the monitoring instrument is normal. If it is abnormal, make necessary adjustments and treatments to make Volvo generators operate in accordance with the specified technical conditions.

Volvo generator's three-phase load current is unbalanced, and the overloaded one-phase winding will overheat; if the difference between the three-phase current exceeds 10% of the rated current, it is a serious phase current imbalance, and the three-phase current imbalance will produce a negative sequence Magnetic field, thereby increasing loss, causing heating of parts such as pole windings and ferrules. The three-phase load should be adjusted to keep the current of each phase as balanced as possible.

The air duct is blocked by dust and poor ventilation makes it difficult for Volvo generators to dissipate heat. The dust and grease in the air duct should be removed to make the air duct unobstructed. If the inlet air temperature is too high or the inlet water temperature is too high, the cooler is blocked. The temperature of the inlet air or inlet water should be lowered to clear the blockage in the cooler. Before the fault is eliminated, the Volvo generator load should be limited to reduce the Volvo generator temperature.

If the bearing has too much or too little grease, the grease should be added according to the regulations, usually 1/2~1/3 of the bearing chamber (the upper limit of the low speed is the upper limit, and the lower limit of the high speed is the lower limit), and it should not exceed the bearing chamber. 70% is appropriate.

Bearing wear. If the wear is not serious, the bearing will locally overheat; if the wear is serious, it may cause friction between the stator and the rotor, causing the stator and rotor avoidance to overheat. The bearings should be checked for noise. If friction between the stator and the rotor is found, the machine should be shut down immediately for maintenance or bearing replacement.

Volvo generator stator core insulation is damaged, causing a short circuit between the sheets, causing local eddy current loss in the core to increase and heating, which will damage the stator winding in severe cases. It should be shut down immediately for maintenance. The parallel wires of the stator winding are broken, causing the current of other wires to increase and heat. It should be shut down immediately for maintenance.

Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.