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

答：并機(jī)使用的條件是兩臺(tái)機(jī)瞬間的電壓、頻率、相位相同。俗稱“三同時(shí)”。用專用并機(jī)裝置來(lái)完成并機(jī)工作。一般建議采用全自動(dòng)并機(jī)柜。盡量不用手動(dòng)并機(jī)。因?yàn)槭謩?dòng)并機(jī)的成功或失敗取決于人為經(jīng)驗(yàn)。筆者以20多年從事電力工作的經(jīng)驗(yàn)斗膽放言，柴油發(fā)電機(jī)手動(dòng)并機(jī)的可靠成功率等于0。決不能以市電大電源系統(tǒng)可用手動(dòng)并機(jī)的概念來(lái)套用小電源系統(tǒng)，因?yàn)槎叩谋Ｗo(hù)等級(jí)完全不一樣的。

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、三相發(fā)電機(jī)的功率因數(shù)是多少？為提高功率因素可以加功率補(bǔ)償器嗎？

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

答：功率因素為0.8。不可以，因?yàn)殡娙萜鞯某浞烹姇?huì)導(dǎo)致小電源的波動(dòng)。及機(jī)組振蕩。

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、為什么我們要求客戶，機(jī)組每運(yùn)行200小時(shí)后，要進(jìn)行一項(xiàng)所有電器接觸件的緊固工作？答：柴油發(fā)電機(jī)組屬振動(dòng)工作器。而且很多國(guó)內(nèi)生產(chǎn)或組裝的機(jī)組該用雙螺母的沒用。該用彈簧墊片的沒用，一旦電器緊固件松懈，會(huì)產(chǎn)生很大的接觸電阻，導(dǎo)致機(jī)組運(yùn)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、為什么發(fā)電機(jī)房保證清潔、地面無(wú)浮沙？

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

答：柴油機(jī)若吸入臟空氣會(huì)使功率下降；發(fā)電機(jī)若吸入沙粒等雜質(zhì)會(huì)使定轉(zhuǎn)子間隙之間的絕緣破壞，重者導(dǎo)致燒毀。

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、為什么自2002年開始我公司一般不建議用戶在安裝時(shí)采用中性點(diǎn)接地？

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

答：1）新一代發(fā)電機(jī)自我調(diào)節(jié)功能大大增強(qiáng)；2）實(shí)踐中發(fā)現(xiàn)中性點(diǎn)接地機(jī)組的雷電故障率偏高；3）接地質(zhì)量要求較高、一般用戶無(wú)法辦到。不安全的工作接地不如不接地；4）中性點(diǎn)接地的機(jī)組會(huì)掩蓋負(fù)荷的漏電故障及接地錯(cuò)誤，而這些故障和錯(cuò)誤在市電大電流供電情況下無(wú)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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