兩臺柴油發電機組并聯,應該注意什么問題？

發電機組并聯必須注意的問題
　　發電機組間負載功率的均勻分配
　　柴油發電機組并聯首先應滿足功率均勻分配的要求。功率均勻分配包含有功功率和無功功率兩個方面。所謂均勻分配指的是各臺發電機所承擔的有功功率和無功功率都應該和它們的額定功率成比例。國內對并聯運行發電機組的功率分配有明確的要求，在交流發電機組并聯運行時，當負載在總額定功率的20%-100% 范圍內變化時，應能穩定運行，其功率分配誤差應符合以下要求：各臺發電機實際承擔的有功功率與按額定功率比例分配的計算值之差，在發電機額定功率相同時應不超過發電機額定有功功率的±10%；當發電機額定功率不同時，應不超過最大發電機額定有功功率±10% ，最小發電機額定有功功率的±20%，各臺發電機實際承擔的無功功率與按發電機額定功率比例分配的計算值之差，應不超過最大發電機額定無功功率的土 10%。
　　如果功率分配出現較大的不均衡，無論是有功功率還是無功功率，都不僅會影響機組運行的效率和經濟性，而且甚至會引起整個電站的故障。如果并聯發電機組的有功功率分配嚴重不平衡的話，在負載總功率較大的時候，往往是一臺發電機組已滿載或過載，而另一臺發電機仍處于輕載狀態，這樣就不能充分利用機組的容量，發揮整個電站的效能。機組過載不但會給柴油機或發電機帶來危害，而且還會引起保護設備動作，影響整個電站的運行。反之，在負載總功率很小的時候，有功功率的不平衡又往往會在發電機組之間引起有功環流，使有的機組轉入電動機狀態，這對柴油機同樣是不允許的。在機組具有逆功保護時，逆功現象將引起逆功跳閘，造成故障。對于負載變化頻繁且變化幅度較大的柴油機電站，上述情況更應引起注意。例如，某船舶電力推進裝置的柴油機電站，由于并聯發電機有功負載分配不均，當船舶全速航行時，總的負載功率較大，經常使重載發電機過載，引起開關跳閘，結果原來輕載的發電機也突然過載，開關接著跳閘，造成嚴重的斷電故障。而在船舶停靠碼頭時，由于總負載很小，輕載的發電機進入逆功狀態，引起逆功跳閘，影響電站甚至整個船舶運行的可靠性。以上情況足以說明，并聯運行發電機組間功率的均勻分配，并不僅僅是一個發電機經濟運行的問題，它還是保證整個柴油機電站供電可靠性的重要因素。無功功率分配不均勻，雖然不會對柴油機造成嚴重影響，但是發電機功率的額定值是根據視在功率確定的，無功功率不平衡，必然會引起發電機視在功率的不平衡，同樣會限制發電機組容量的發揮，特別是對于功率因數較低的電站，機組的帶負載能力不是取決于柴油機的額定功率，而是取決于發電機額定電流數值的大小。無功負載的不平衡，也可以把其不均衡部分看成是兩臺發電機之間的一種環流，有時這種環流會超過發電機的負載電流，在發電機內部產生附加的損耗，甚至使發電機過載。無功的過載電流同樣會使發電機的主開關跳閘，造成故障。此外，發電機無功電流的大小是和其勵磁電流相一致的，無功電流的不平衡往往和勵磁電流不平衡同時發生，使勵磁系統過載甚至產生故障，如發電機轉子繞組被燒毀，相復勵裝置的整流二極管損壞等，這種故障的后果往往是相當嚴重的。可以看出，無功負載的均勻分配和有功負載均勻分配具有同樣意義。

柴油發電機組的負載由50%突然增加到100%（負載主要是電動機），同步發電機的頻率和電壓變化怎么計算？

“對這種沖擊負載情況電壓下降不超過3%”，這種要求是對調節結束穩定后的狀態，要是在調節動態過程中則絕對不止這么大。要求電壓穩定，前提條件是轉速偏差小（柴油機自動調速器靈敏），但關鍵還靠勵磁調節器的性能好，只要正規產器，一般是在調節穩定后能滿足要求的。可把調差系數調小點或改成無差調節。但柴油機的調速器好象沒有無差調節的，一般滿載后頻率將比空載時下降1~2HZ左右。

發電機并車時無功電流的分配問題？

發電機并車運行的功率分配一般是由發動機調速系統的控制器來實現的，根據測量機組并車時負荷分配情況進行調速整定。
AVR是安裝與發電機內部的自動電壓調節裝置，當兩臺機組并車時，可以通過調整機組的功率因數而改變無功的分配。當并車運行情況下，調整單臺機組的電壓（AVR)就可以改變無功的分配。

兩臺船舶用柴油發電機功率、電壓、頻率及其它參數都一樣，在并車時為什么其中一臺會會出現負無功功率？

一臺出現負無功是因為兩臺電機的電壓有差別引起的，無功分配不均會引起兩臺電機之間的環流。可以微調一下其中一臺電機的電壓使之接近一致。

4臺卡特3512B發電機組，負荷大時并網的兩臺車出現有功均衡，無功相差很大？

要調節發電機的無功特性一致，防止搶無功，重點是勵磁調差系數

發電機組的開.停機以及并網如何進行操作？

不同的廠操作流程有所不同，因此必須根據本廠開停機運行規程操作。
無論自動準同期還是手動準同期，都必須調整到滿足電壓、頻率、相角三條件。

1320kW/威爾信柴油發電機組尺寸與所有的威爾信機型型號？

機型P9.5-2 P13.5-4 P22-4 P27P1 P30E1 P40P3 P44E3 P45P3 P50E3 P60P3 P65E3 P80P1 P88E1 P100P2 P110E2 P135 P150E P150P1 P165E1 P200H2 P220HE2 P230H2 P250HE2 P250H2 P275HE2 P350P5 P400E5 P400P5  P450E5 P450P3 P500E3 P500P3 P550E3 P600P5 P660E5 P635P5 P700E5 P730P1 P800E1 P800P1 P900E1 P1000P1 P1100E1 P1250P3 P1375E3 P1500P3 P1650E3

P1375E威爾信柴油發電機組無法啟動故障的原因？

帕金斯發動機活塞型號大全

林德帕金斯柴油泵故障配件？

帕金斯1106D柴油機自動降速，什么故障？

康明斯柴油發電機的煙囪進水，水會流到曲軸的機油箱體內？

漏水從煙囪中間下來----經過增壓器----各排氣管分叉口，各缸排氣門，當前排氣打開的氣門----進入氣缸體----曲軸的機油箱，煙囪進水后會引起增壓器銹蝕卡死，排氣門卡死，曲軸銹蝕，造成機組損壞

柴油發電機負荷過低時，排氣管有時為什么會滴油？

先判斷是滑油還是燃油，滑油的話就是好吊缸檢修了，燒滑油，柴油的話那就是油頭霧化不好。

柴油機排氣管冒黑煙機油壓力降低會迅速導致發動機燒瓦嗎？

會造成燒瓦，因為排黑煙，就是發動機內的空燃比大了，油過多了或空氣過少燃燒不充分，不充分的燃油會進入發動機的油底殼，會使用機油被柴油稀釋變稀，體現在發動機的機油壓力低，壓力低就表面發動機的潤滑油出現了故障，所以會造成燒瓦或者拉缸故障。

東風康明斯發動機上節溫器不能正常工作，拆后試驗時又正常是什么原因呢？

有可能是密封圈的問題，換一下密封圈看看。有的時候節溫器座在生產時那個三聯孔和斜面在加工時會有比較大的加工誤差，又檢不出來，往往會造成密封不好

東風康明斯發動機 EQ1108J6104 節溫器怎么安裝？

節溫器一般安裝在水箱和缸體水道之間，一般安裝在發動機的進水管路。水溫低的時候進行小循環，節溫器不打開。水溫高的話，節溫器打開，通過水箱進行大循環。

ISBE康明斯發動機工作時正常水溫在好多度？

83節溫器打開，93度全開，也就是說 發動機溫度高于93度了，這就說明只能看你的散熱器最大極限是多少了，發動機希望不要超過93度，

康明斯發動機開鍋的原因？

檢查水泵、節溫器，水箱的水位及水箱是否干凈。

康明斯發動機膨脹水箱冒泡是什么原因?

發動機膨脹？你是怎么看出的啊，膨脹有這么明顯嗎?水箱冒泡，是因為缸墊沖掉了，換缸墊就可以了。

Two sets of diesel generator set in parallel, should pay attention to what problem?

Generator set in parallel must pay attention to the problem

Uniform distribution of load power between generators

Diesel generator set in parallel should first satisfy the requirement of uniform power allocation. Evenly distributed power includes two aspects of active power and reactive power. Uniform distribution refers to the so-called to each generator active power and reactive power should be and they rated power is proportional to the. Domestic power allocation of parallel running generators have clear requirements, when ac generator in parallel operation, when the load in the 20% 100% of the total rated power range change, should be able to stable operation, the power allocation error should meet the following requirements: each generator shall pay distribution of active power and the rated power proportion of the difference between the calculated value of the rated power of the generator phase at the same time should not more than plus or minus 10% of rated active power generator; When generator rated power at the same time, should be no more than the biggest generator rated active power plus or minus 10%, minimum + / - 20% of the rated active power generator, the generator for reactive power and actual allocation according to generator rated power ratio of the difference between the calculated value, shall not exceed maximum generator rated reactive power of the soil by 10%.

If a larger power distribution uneven, both active power and reactive power, are not only affects the efficiency and economy of unit operation, and may even cause the entire plant's fault. If parallel generator active power distribution of serious imbalance, at the time of total power load is bigger, often is a generating set has full load and overload, and the other a generator is still in the light load condition, it will not be able to make full use of the capacity of the unit, give play to the efficiency of the whole power plant. Unit load not only has a harmful effect on diesel engine or generator, but also will cause protective equipment, affect the overall operation of the power station. Conversely, when total power load is small, the active power imbalance and tend to cause active circulation between the generating set, move some units to motor, the diesel engine is also not allowed. When the unit has a reverse power protection, inverse power phenomenon will cause the inverse power trip, cause of failure. For load change frequently and change in large diesel power station, the above situation should attract attention. For example, a diesel engine of the ship electric propulsion system power station, due to the uneven distribution of parallel generator active load, when the ship sailing at full speed, the total load power is larger, often makes overload generator overload, causes the switch tripping, original results light load of generator is suddenly overloaded, then switch tripping, cause serious power failure. And when the ship dock, due to the total load is small, light load of the inverse power generators into the state, cause inverse power tripping, influence on the reliability of the power plant or even the whole shipping operation. More than enough to illuminate, evenly distributed power for parallel operation of generating units, is not just a problem of economic operation of the generator, it still keep the diesel power station the important factor of the power supply reliability. Uneven distribution of reactive power, although not caused serious influence on diesel engine, but the generator power rating is determined according to the apparent power and reactive power imbalance, will inevitably cause the imbalance of generator's apparent power, will also restrict generating unit capacity, especially for the low power factor of power station, the load capacity of the unit is not depend on the rated power of diesel engine, but rather depends on the size of the generator rated current value. Reactive load imbalance, also can put their uneven parts as a circulation between the two generators, sometimes more than generator load current, the circulation inside the generator generate additional losses, and even make the generator overload. Reactive power of the overload current will also make the generator main breaker tripping, cause of failure. In addition, the size of the reactive current of generator is consistent and its excitation current, reactive current imbalance often and excitation current imbalance occur at the same time, the excitation system overload or even failure, such as the generator rotor winding was destroyed, the rectifier diode phase compound excitation device damage, such as the failure consequences tend to be quite serious. As you can see, reactive power loads and the uniform distribution of active load evenly distribution has the same meaning.

Diesel generator set the load suddenly increased from 50% to 100% load (mainly motor), synchronous generator's frequency and voltage change how to calculate?

"To this kind of impact load is not more than 3% drop in voltage, this requirement is to adjust after steady state, if only in the process of adjusting dynamic is absolutely more than that. Required voltage stability, the premise condition is small (sensitive) diesel engine governor speed deviation, but the key also depends on the excitation regulator performance is good, as long as the regular production, is generally after adjusting stability can meet the requirements. Can change pitch difference coefficient of small points, or to no bad regulation. But regulating the speed governor of diesel engine doesn't seem to be no difference in general frequency will be lower than when no load after load around 1 ~ 2 hz.

Generator and the allocation of reactive current car?

Generator and car running power allocation is generally by the controller of engine speed control system, according to the measuring unit and vehicle load distribution when the speed setting.

AVR is installed with automatic voltage regulation device inside the generator, when the two units and the car, can through adjusting unit power factor and changing the allocation of reactive power. When the car and run case, adjust the voltage of a single unit (AVR) can change the allocation of reactive power.

Two ships with diesel generator power, voltage, frequency and other parameters are the same, why one of them to ride in the car, and negative reactive power?

A negative reactive power caused by two motor voltage difference, uneven distribution of the reactive power can cause the circulation between the two motors. One can fine tune the motor voltage close to agreement.

Big four carter 3512 b generator, load active equalization, the interconnection of two cars appear when the difference in reactive?

Want to adjust the reactive power of generator characteristics consistent, prevent rob reactive power, emphasis is on field adjustable differential coefficient

Generator set open. Downtime and grid how to operate?

Different factory operation process is different, so must according to our factory is a key operation procedures.

Whether automatic quasi-synchronizing or manual penecontemporaneous, must be adjusted to meet the three conditions voltage, frequency and phase Angle.

1320 kw/will believe it diesel generating set with all size will machine model?

Model P22 P13.5 P9.5-2-4-4 P27P1 P30E1 P40P3 P44E3 P45P3 P50E3 P60P3 P65E3 P80P1 P88E1 P100P2 P110E2 P135 P150E P150P1 P165E1 P200H2 P220HE2 P230H2 P250HE2 P250H2 P275HE2 P350P5 P400E5 P400P5 P450E5 P450P3 P500E3 P500P3 P550E3 P600P5 P660E5 P635P5 P700E5 P730P1 P800E1 P800P1 P900E1 P1000P1 P1100E1 P1250P3 P1375E3 P1500P3 P1650E3

P1375E will letter diesel generating set can't boot failure reason?

Models of perkins engine piston

Linde perkins diesel pump failure parts?

Perkins diesel engine 1106 d automatically slow down, what is failure?

Chimney inlet of cummins diesel generator, water will flow to the crankshaft of the engine oil the casing?

Leaking between the chimney down - after a supercharger, the exhaust pipe fork mouth, each cylinder exhaust valve, the exhaust valve open - into the cylinder block, crankshaft machine fuel tank, chimney in water will cause the supercharger rust stuck, exhaust door jammed, crankshaft rust, caused by damage to the unit

Diesel generator at low load, the exhaust pipe sometimes why drip?

Judgment is the first oil or fuel oil, lubricating oil is good lifting cylinder overhaul, burn oil, diesel fuel that is oil atomization is bad.

Diesel engine exhaust pipe at black cigarette machine oil pressure will reduce rapidly lead to engine burning tile?

Will cause the tile burning, because of the exhaust black smoke, is within the engine air-fuel ratio, combustion of oil too much or too little air is not sufficient, inadequate will fuel into the engine oil sump, will dilute oil used by diesel is thinning, reflected in the low engine oil pressure, engine lube oil pressure is low surface malfunctioned, so will cause the tile burning or scuffing failure.

Dongfeng cummins engine thermostat can't work properly, open after the test when the normal again is what reason?

Is probably the seal problem, change the sealing ring and have a look. Sometimes thermostat during production that the joint hole and cant in machining with larger error and check out again, will tend to cause bad sealing

Dongfeng cummins engine EQ1108J6104 thermostat installed?

Thermostat is generally installed in the water tank and water channel between the cylinder body, usually installed in the inlet pipe of engine. Pulmonary circulation water temperature low, don't open thermostat. Water temperature is high, the thermostat opens, systemic circulation through the tank.

ISBE cummins engine at normal temperature in a lot of work?

Open 83 thermostat opens, 83 degrees, which means the engine temperature higher than 93 degrees, which means only depends on how much is your radiator maximum limit in, engine hope not more than 93 degrees,

The cause of the cummins engine boiled?

Check the water pump, thermostat, water level of the water tank and water tank is clean.

Cummins engine expansion tank bubbling is what reason?

Expansion of the engine? How do you see ah, inflation so obvious? Washed clean by water bubble, because cylinder pad, cylinder pad.