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56 technical questions and answers of diesel generator set–no. 5

1. What are the conditions for the parallel use of two generator sets? What device is used to complete the parallel work?
Answer: The condition for parallel use is that the instantaneous voltage, frequency and phase of the two machines are the same. Commonly known as “three simultaneous”. Use a dedicated parallel device to complete the parallel work. It is generally recommended to use fully automatic cabinets. Try not to use manual paralleling. Because the success or failure of manual paralleling depends on human experience. With more than 20 years of experience in electrical work, the author boldly stated that diesel generators are manually combined the reliable success rate of the machine is equal to zero. Never use the concept of manual paralleling for a large mains power supply system to apply a small power supply system, because the protection levels of the two are completely different.
2. What is the power factor of the three-phase generator? Can a power compensator be added to improve the power factor?
Answer: The power factor is 0.8. No, because the charging and discharging of the capacitor will cause the fluctuation of the small power supply. And the unit oscillates.
3. Why do we require customers to tighten all electrical contacts every 200 hours of operation?
Answer: Diesel generator set is a vibrating working device. Moreover, many domestically produced or assembled units should use double nuts which are useless. The use of spring washers is useless. Once the electrical fasteners are loosened, a large contact resistance will be generated, which will cause the unit to operate abnormally.
4. Why must the generator room be clean and free of floating sand on the ground?
Answer: If the diesel engine sucks in dirty air, the power will decrease; if the generator sucks in sand and other impurities, the insulation between the stator and rotor gaps will be damaged, and the worst will cause burnout.
5. Since 2002, why our company generally does not recommend users to use neutral point grounding during installation?

1) The self-regulating function of the new generation generator is greatly enhanced;
2) In practice, it is found that the lightning failure rate of the neutral-grounded unit is relatively high.
3) The grounding quality requirements are high, and ordinary users cannot do it. Unsafe work grounding is not as good as ungrounding.
4) Units whose neutral point is grounded will cover up the leakage faults and grounding errors of the load, and these faults and errors cannot be exposed under the condition of large current supply from the mains.

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Post time: Apr-28-2021

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