Analysis of Some Technical Problems of Diesel Generating Sets

As diesel generator sets are used as emergency backup power sources, more and more users have entered the sights of users. However, regarding many technical problems on generator sets, we have meet various problems in the process of producing and selling diesel generator sets for many years. Summarized as follows.

1.If the power demand is large and a single generator set fails to meet the requirements, two or more generator sets are required for parallel operation, what are the conditions for parallel operation of two generator sets? What device is used to complete the parallel operation?

Answer: The condition for parallel operation is that the instantaneous voltage, frequency and phase of the two machines are the same. Commonly known as "three Simultaneities". Use special parallel device to complete parallel operation. It is generally recommended to use full-automatic parallel cabinet. Try not to parallelize manually. Because the success or failure of manual paralleling depends on human experience. Never apply the concept of manual parallel operation to the small power supply system, because the protection level of the two is completely different.

2. Industrial diesel generator sets are three-phase four wire generators. What is the power factor of three-phase diesel generator? If you want to improve the power factor, can you add a power compensator?

Answer: under normal circumstances, the power factor of the generator set is 0.8. Because the charging and discharging of the capacitor will lead to the fluctuation of small power supply and unit oscillation, the power compensator cannot be added.

3. During the use of diesel generator set, it is necessary to check the fasteners of all electrical contacts every 200 hours. Why?

Answer: because the diesel generator set is a vibration device. The generator set will produce certain vibration during normal operation, while many domestic production or assembly units do not use double nuts and spring gaskets. Once the electrical fasteners are loosened, great contact resistance will be generated, resulting in abnormal operation of the unit. Therefore, check the solid electrical contacts regularly to prevent looseness.

4. The diesel generator room must always be clean, free of floating sand and well ventilated

During the use of diesel generator, air will be inhaled, or there is pollution in the air. The engine will inhale dirty air, which will reduce the generator power; If sand and other impurities are inhaled, the insulation between stator and rotor gaps will be damaged, and the serious one will lead to burning. If the ventilation is not smooth, the heat generated by the generator set cannot be discharged in time, which will produce the water high temperature alarm of the generator set, thus affecting the use.

5. It is suggested that the user must adopt neutral grounding when installing the generator set.

6. For Ungrounded generator set with neutral point, the following problems shall be paid attention to during use?

The zero line may be charged because the capacitive voltage between the live line and the neutral point cannot be eliminated. The operator must regard line 0 as a live body. It cannot be handled according to the habit of mains power.

7.Not all diesel generator sets have self-protection function.

At present, some of the diesel generator sets of the same brand are with or without. Users must find out by themselves when purchasing diesel generator sets. It is better to write in writing as an annex to the contract. Most of the diesel generator sets produced by Dingbo power have automatic protection power, please rest assured to buy.