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 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 operation. It is generally recommended to use fully automatic and cabinets. Try not to manually parallel. Because the success or failure of manual parallelism depends on human experience. The author has been vocal about more than 20 years of experience in electric power work. The reliable success rate of manual paralleling of diesel generators is equal to zero. It is never possible to apply a small power system with the concept of manual paralleling of the mains power system, because the protection levels of the two are completely different.
2. What is the power factor of the three-phase generator? Can I add a power compensator to improve the power factor?
A: The power factor is 0.8. No, because the charging and discharging of the capacitor will cause fluctuations in the small power supply. And the unit oscillated.
3. Why do we ask the customer to carry out a fastening work for all electrical contact parts after every 200 hours of operation?
Answer: Diesel generator sets are vibration workers. Moreover, many domestically produced or assembled units should be useless with double nuts. The use of the spring washer is useless. Once the electrical fastener is loose, a large contact resistance is generated, which causes the unit to operate abnormally.
4. Why should the generator room be clean and there is no floating sand on the ground?
Answer: If the diesel engine inhales dirty air, the power will drop. If the generator inhales impurities such as sand, it will cause insulation damage between the stator and rotor gaps, which will cause burns.
5. Why has the company generally advised users to use neutral point grounding during installation since 2002?
Answer: 1) The new generation of generator self-regulation function is greatly enhanced;
2) In practice, it is found that the lightning failure rate of the neutral grounding unit is high.
3) The grounding quality requirements are high and cannot be achieved by ordinary users. Unsafe working grounding is not as grounded as it is.
4) Units with neutral grounding will cover the leakage faults and grounding errors of the load, and these faults and errors cannot be exposed under the condition of high-current power supply.
6. What should be paid attention to when using the ungrounded unit with neutral point?
A: The 0 line may be charged because the capacitor voltage between the live line and the neutral point cannot be eliminated. The operator must regard the 0 line as a charged body. Can not be handled according to the utility of the city.
7. How does the ups and diesel generators match the power to ensure that the ups output is stable? Answer: 1) The ups are generally expressed by the apparent power kva, which is first converted into 0.8 by the unit kw that is consistent with the generator active power.
2) If a general generator is used, multiply the active power of the ups by 2 to determine the power of the generator, that is, the power of the generator is twice the power of the ups.
3) If a generator with pmg (permanent magnet excitation) is used, the power of the ups is multiplied by 1.2 to determine the generator power, ie the generator power is 1.2 times the ups power.
8. Can the electronic or electrical components with a withstand voltage of 500v be used in diesel generator control cabinets?
A: No. Because the 400/230v voltage indicated on the diesel generator set is the effective voltage. Its peak voltage is 1.414 times the effective voltage. That is, the peak voltage of the diesel generator is umax=566/325v.
Answer: The condition for parallel use is that the 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 operation. It is generally recommended to use fully automatic and cabinets. Try not to manually parallel. Because the success or failure of manual parallelism depends on human experience. The author has been vocal about more than 20 years of experience in electric power work. The reliable success rate of manual paralleling of diesel generators is equal to zero. It is never possible to apply a small power system with the concept of manual paralleling of the mains power system, because the protection levels of the two are completely different.
2. What is the power factor of the three-phase generator? Can I add a power compensator to improve the power factor?
A: The power factor is 0.8. No, because the charging and discharging of the capacitor will cause fluctuations in the small power supply. And the unit oscillated.
3. Why do we ask the customer to carry out a fastening work for all electrical contact parts after every 200 hours of operation?
Answer: Diesel generator sets are vibration workers. Moreover, many domestically produced or assembled units should be useless with double nuts. The use of the spring washer is useless. Once the electrical fastener is loose, a large contact resistance is generated, which causes the unit to operate abnormally.
4. Why should the generator room be clean and there is no floating sand on the ground?
Answer: If the diesel engine inhales dirty air, the power will drop. If the generator inhales impurities such as sand, it will cause insulation damage between the stator and rotor gaps, which will cause burns.
5. Why has the company generally advised users to use neutral point grounding during installation since 2002?
Answer: 1) The new generation of generator self-regulation function is greatly enhanced;
2) In practice, it is found that the lightning failure rate of the neutral grounding unit is high.
3) The grounding quality requirements are high and cannot be achieved by ordinary users. Unsafe working grounding is not as grounded as it is.
4) Units with neutral grounding will cover the leakage faults and grounding errors of the load, and these faults and errors cannot be exposed under the condition of high-current power supply.
6. What should be paid attention to when using the ungrounded unit with neutral point?
A: The 0 line may be charged because the capacitor voltage between the live line and the neutral point cannot be eliminated. The operator must regard the 0 line as a charged body. Can not be handled according to the utility of the city.
7. How does the ups and diesel generators match the power to ensure that the ups output is stable? Answer: 1) The ups are generally expressed by the apparent power kva, which is first converted into 0.8 by the unit kw that is consistent with the generator active power.
2) If a general generator is used, multiply the active power of the ups by 2 to determine the power of the generator, that is, the power of the generator is twice the power of the ups.
3) If a generator with pmg (permanent magnet excitation) is used, the power of the ups is multiplied by 1.2 to determine the generator power, ie the generator power is 1.2 times the ups power.
8. Can the electronic or electrical components with a withstand voltage of 500v be used in diesel generator control cabinets?
A: No. Because the 400/230v voltage indicated on the diesel generator set is the effective voltage. Its peak voltage is 1.414 times the effective voltage. That is, the peak voltage of the diesel generator is umax=566/325v.
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