1. What are the conditions for the parallel operation of two generator sets? What device is used to complete the parallel operation?

答：并机使用的条件是两台机瞬间的电压、频率、相位相同。俗称“三同时”。用专用并机装置来完成并机工作。一般建议采用全自动并机柜。尽量不用手动并机。因为手动并机的成功或失败取决于人为经验。笔者以20多年从事电力工作的经验斗胆放言，柴油发电机手动并机的可靠成功率等于0。决不能以市电大电源系统可用手动并机的概念来套用小电源系统，因为二者的保护等级完全不一样的。

Answer: the condition for parallel operation is that the voltage, frequency and phase of the two machines are the same at the moment. Commonly known as "three Simultaneities". Use special paralleling device to complete paralleling work. It is generally recommended to adopt fully automatic parallel cabinet. Try not to parallelize manually. Because the success or failure of manual paralleling depends on human experience. Based on more than 20 years of experience in power work, the author ventured to say that the reliable success rate of manual paralleling of diesel generators is equal to 0. We must not apply the concept of manual paralleling to the small power supply system, because the protection level of the two is completely different.

2、三相发电机的功率因数是多少？为提高功率因素可以加功率补偿器吗？

2. What is the power factor of a three-phase generator? Can a power compensator be added to improve the power factor?

答：功率因素为0.8。不可以，因为电容器的充放电会导致小电源的波动。及机组振荡。

Answer: the power factor is 0.8. No, because the charging and discharging of capacitors will cause small power supply fluctuations. And unit oscillation.

3、为什么我们要求客户，机组每运行200小时后，要进行一项所有电器接触件的紧固工作？答：柴油发电机组属振动工作器。而且很多国内生产或组装的机组该用双螺母的没用。该用弹簧垫片的没用，一旦电器紧固件松懈，会产生很大的接触电阻，导致机组运行不正常。

3. Why do we require our customers to tighten all electrical contacts every 200 hours of operation? Answer: the diesel generator set is a vibration device. And many domestic production or assembly units that should use double nuts are useless. It's useless to use spring gaskets. Once the electrical fasteners are loosened, a large contact resistance will be generated, resulting in abnormal operation of the unit.

4、为什么发电机房保证清洁、地面无浮沙？

4. Why is the generator room clean and the ground free of floating sand?

答：柴油机若吸入脏空气会使功率下降；发电机若吸入沙粒等杂质会使定转子间隙之间的绝缘破坏，重者导致烧毁。

Answer: if the diesel engine inhales dirty air, its power will decrease; If the generator inhales sand and other impurities, the insulation between the stator and rotor gaps will be damaged, which will lead to burning.

5、为什么自2002年开始我公司一般不建议用户在安装时采用中性点接地？

5. Why does our company generally not recommend that users adopt neutral grounding during installation since 2002?

答：1）新一代发电机自我调节功能大大增强；2）实践中发现中性点接地机组的雷电故障率偏高；3）接地质量要求较高、一般用户无法办到。不安全的工作接地不如不接地；4）中性点接地的机组会掩盖负荷的漏电故障及接地错误，而这些故障和错误在市电大电流供电情况下无法暴露。

Answer: 1) the self-regulation function of the new generation generator is greatly enhanced; 2) In practice, it is found that the lightning fault rate of neutral grounded units is high; 3) The requirements for grounding quality are high, which is impossible for ordinary users. It is better not to be grounded for unsafe work; 4) The neutral grounded unit will cover up the leakage fault and grounding error of the load, which cannot be exposed under the condition of large current supply of the municipal power supply.

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