两台柴油发电机组并联应该注意什么问题？

两台柴油发电机组并联,应该注意什么问题？

发电机组并联必须注意的问题
　　发电机组间负载功率的均匀分配
　　柴油发电机组并联首先应满足功率均匀分配的要求。功率均匀分配包含有功功率和无功功率两个方面。所谓均匀分配指的是各台发电机所承担的有功功率和无功功率都应该和它们的额定功率成比例。国内对并联运行发电机组的功率分配有明确的要求，在交流发电机组并联运行时，当负载在总额定功率的20%-100% 范围内变化时，应能稳定运行，其功率分配误差应符合以下要求：各台发电机实际承担的有功功率与按额定功率比例分配的计算值之差，在发电机额定功率相同时应不超过发电机额定有功功率的±10%；当发电机额定功率不同时，应不超过最大发电机额定有功功率±10% ，最小发电机额定有功功率的±20%，各台发电机实际承担的无功功率与按发电机额定功率比例分配的计算值之差，应不超过最大发电机额定无功功率的土 10%。
　　如果功率分配出现较大的不均衡，无论是有功功率还是无功功率，都不仅会影响机组运行的效率和经济性，而且甚至会引起整个电站的故障。如果并联发电机组的有功功率分配严重不平衡的话，在负载总功率较大的时候，往往是一台发电机组已满载或过载，而另一台发电机仍处于轻载状态，这样就不能充分利用机组的容量，发挥整个电站的效能。机组过载不但会给柴油机或发电机带来危害，而且还会引起保护设备动作，影响整个电站的运行。反之，在负载总功率很小的时候，有功功率的不平衡又往往会在发电机组之间引起有功环流，使有的机组转入电动机状态，这对柴油机同样是不允许的。在机组具有逆功保护时，逆功现象将引起逆功跳闸，造成故障。对于负载变化频繁且变化幅度较大的柴油机电站，上述情况更应引起注意。例如，某船舶电力推进装置的柴油机电站，由于并联发电机有功负载分配不均，当船舶全速航行时，总的负载功率较大，经常使重载发电机过载，引起开关跳闸，结果原来轻载的发电机也突然过载，开关接着跳闸，造成严重的断电故障。而在船舶停靠码头时，由于总负载很小，轻载的发电机进入逆功状态，引起逆功跳闸，影响电站甚至整个船舶运行的可靠性。以上情况足以说明，并联运行发电机组间功率的均匀分配，并不仅仅是一个发电机经济运行的问题，它还是保证整个柴油机电站供电可靠性的重要因素。无功功率分配不均匀，虽然不会对柴油机造成严重影响，但是发电机功率的额定值是根据视在功率确定的，无功功率不平衡，必然会引起发电机视在功率的不平衡，同样会限制发电机组容量的发挥，特别是对于功率因数较低的电站，机组的带负载能力不是取决于柴油机的额定功率，而是取决于发电机额定电流数值的大小。无功负载的不平衡，也可以把其不均衡部分看成是两台发电机之间的一种环流，有时这种环流会超过发电机的负载电流，在发电机内部产生附加的损耗，甚至使发电机过载。无功的过载电流同样会使发电机的主开关跳闸，造成故障。此外，发电机无功电流的大小是和其励磁电流相一致的，无功电流的不平衡往往和励磁电流不平衡同时发生，使励磁系统过载甚至产生故障，如发电机转子绕组被烧毁，相复励装置的整流二极管损坏等，这种故障的后果往往是相当严重的。可以看出，无功负载的均匀分配和有功负载均匀分配具有同样意义。

柴油发电机组的负载由50%突然增加到100%（负载主要是电动机），同步发电机的频率和电压变化怎么计算？

“对这种冲击负载情况电压下降不超过3%”，这种要求是对调节结束稳定后的状态，要是在调节动态过程中则绝对不止这么大。要求电压稳定，前提条件是转速偏差小（柴油机自动调速器灵敏），但关键还靠励磁调节器的性能好，只要正规产器，一般是在调节稳定后能满足要求的。可把调差系数调小点或改成无差调节。但柴油机的调速器好象没有无差调节的，一般满载后频率将比空载时下降1~2HZ左右。

发电机并车时无功电流的分配问题？

发电机并车运行的功率分配一般是由发动机调速系统的控制器来实现的，根据测量机组并车时负荷分配情况进行调速整定。
AVR是安装与发电机内部的自动电压调节装置，当两台机组并车时，可以通过调整机组的功率因数而改变无功的分配。当并车运行情况下，调整单台机组的电压（AVR)就可以改变无功的分配。

两台船舶用柴油发电机功率、电压、频率及其它参数都一样，在并车时为什么其中一台会会出现负无功功率？

一台出现负无功是因为两台电机的电压有差别引起的，无功分配不均会引起两台电机之间的环流。可以微调一下其中一台电机的电压使之接近一致。

4台卡特3512B发电机组，负荷大时并网的两台车出现有功均衡，无功相差很大？

要调节发电机的无功特性一致，防止抢无功，重点是励磁调差系数

发电机组的开.停机以及并网如何进行操作？

不同的厂操作流程有所不同，因此必须根据本厂开停机运行规程操作。
无论自动准同期还是手动准同期，都必须调整到满足电压、频率、相角三条件。

1320kW/威尔信柴油发电机组尺寸与所有的威尔信机型型号？

机型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威尔信柴油发电机组无法启动故障的原因？

帕金斯发动机活塞型号大全

林德帕金斯柴油泵故障配件？

帕金斯1106D柴油机自动降速，什么故障？

康明斯柴油发电机的烟囱进水，水会流到曲轴的机油箱体内？

漏水从烟囱中间下来----经过增压器----各排气管分叉口，各缸排气门，当前排气打开的气门----进入气缸体----曲轴的机油箱，烟囱进水后会引起增压器锈蚀卡死，排气门卡死，曲轴锈蚀，造成机组损坏

柴油发电机负荷过低时，排气管有时为什么会滴油？

先判断是滑油还是燃油，滑油的话就是好吊缸检修了，烧滑油，柴油的话那就是油头雾化不好。

柴油机排气管冒黑烟机油压力降低会迅速导致发动机烧瓦吗？

会造成烧瓦，因为排黑烟，就是发动机内的空燃比大了，油过多了或空气过少燃烧不充分，不充分的燃油会进入发动机的油底壳，会使用机油被柴油稀释变稀，体现在发动机的机油压力低，压力低就表面发动机的润滑油出现了故障，所以会造成烧瓦或者拉缸故障。

东风康明斯发动机上节温器不能正常工作，拆后试验时又正常是什么原因呢？

有可能是密封圈的问题，换一下密封圈看看。有的时候节温器座在生产时那个三联孔和斜面在加工时会有比较大的加工误差，又检不出来，往往会造成密封不好

东风康明斯发动机 EQ1108J6104 节温器怎么安装？

节温器一般安装在水箱和缸体水道之间，一般安装在发动机的进水管路。水温低的时候进行小循环，节温器不打开。水温高的话，节温器打开，通过水箱进行大循环。

ISBE康明斯发动机工作时正常水温在好多度？

83节温器打开，93度全开，也就是说 发动机温度高于93度了，这就说明只能看你的散热器最大极限是多少了，发动机希望不要超过93度，

康明斯发动机开锅的原因？

检查水泵、节温器，水箱的水位及水箱是否干净。

康明斯发动机膨胀水箱冒泡是什么原因?

发动机膨胀？你是怎么看出的啊，膨胀有这么明显吗?水箱冒泡，是因为缸垫冲掉了，换缸垫就可以了。

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.