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Beware of the eight reasons that cause the diesel generator to overheat and prematurely damage
Browse: Release Date: 2019-12-25
Beware of the eight reasons that cause the diesel generator to overheat and prematurely damage
As the temperature continues to rise, the generator set will also heat up quickly during use and the temperature will be higher. This is also the normal heat dissipation phenomenon in generator use. But sometimes, once the generator fails, it will also cause abnormal heating, which requires the user to carefully check and analyze. After all, the price of generators is not low, and it is not worth the lease of generators if unnecessary losses are not caused due to thermal faults.
The fault-type overheating analysis of the generator is as follows:
1. The generator does not operate according to the specified technical conditions, such as the stator voltage is too high, the iron loss increases; the load current is too large, the stator winding copper loss increases; the frequency is too low, which makes the cooling fan speed slower and affects the heat dissipation of the generator ; The power factor is too low, causing the rotor excitation current to increase, causing the rotor to heat up. Check that the indication of the monitoring instrument is normal. If it is not normal, necessary adjustments and treatments shall be carried out to make the generator run in accordance with the specified technical conditions.
Beware of the eight reasons that cause the diesel generator to overheat and prematurely damage
2. The three-phase load current of the generator is unbalanced, and the overloaded one-phase winding will overheat; if the difference between the three-phase currents exceeds 10% of the rated current, it is a serious phase-current imbalance, and the three-phase current imbalance will produce a negative Sequential magnetic field, thereby increasing losses, causing magnetic pole windings and ferrules and other components to heat up. The three-phase load should be adjusted to keep the current of each phase as balanced as possible.
3. The air duct is blocked by dust accumulation and poor ventilation, which makes it difficult for the generator to dissipate heat. The dust and grease on the air duct should be removed to make the air duct unobstructed.
4. The inlet air temperature is too high or the inlet water temperature is too high, and the cooler is blocked. Reduce the inlet air or water temperature to clear the blockage in the cooler. Before the fault is eliminated, the load on the generator should be limited to reduce the temperature of the generator.
5. Too much or too little grease should be added to the bearing according to the regulations, usually 1/2 to 1/3 of the bearing chamber (the lower limit for the low speed and the lower limit for the high speed), and not exceeding 70% of the room is appropriate.
6. Bearing wear. If the wear is not serious, the bearing will overheat locally; if the wear is serious, the stator and rotor may be rubbed, causing the stator and rotor avoiding parts to overheat. The bearings should be checked for noise. If friction between the stator and rotor is found, stop the machine immediately for maintenance or replace the bearings.
7. The stator core insulation is damaged, which causes a short circuit between the chips, which causes the local eddy current loss of the core to increase and heat, and in serious cases, the stator windings will be damaged. Stop immediately for maintenance.
8. The parallel wires of the stator winding are broken, causing the current of other wires to increase and generate heat. Shut down immediately to overhaul generator leasing.
Generator rental -Sichuan Chengtianyi Electromechanical Equipment Co., Ltd. is a company specializing in leasing and selling diesel generators and leasing and selling electromechanical equipment. The company has a wide range of generators and comprehensive services. .