柴油發(fā)電機勵磁系統(tǒng)的工作原理？

勵磁系統(tǒng)的主要作有：
1）根據(jù)發(fā)電機負荷的變化相應的調(diào)節(jié)勵磁電流，以維持機端電壓為給定值；
2）控制并列運行各發(fā)電機間無功功率分配；
3）提高發(fā)電機并列運行的靜態(tài)穩(wěn)定性；
4）提高發(fā)電機并列運行的暫態(tài)穩(wěn)定性；
5）在發(fā)電機內(nèi)部出現(xiàn)故障時，進行滅磁，以減小故障損失程度；
6）根據(jù)運行要求對發(fā)電機實行最大勵磁限制及最小勵磁限制。

機組勵磁系統(tǒng)滅磁方法和用處？

主要有滅磁開關滅磁，逆變滅磁，
滅磁開關滅磁，是在滅磁開關主接點斷開前先通過一個滅磁接點接入滅磁電阻，也就是使轉子回路并聯(lián)滅磁電阻，然后斷開主接點，在滅磁開關主接點斷開后由于滅磁接點把滅磁電阻并聯(lián)在轉子一起，勵磁繞組能量轉移到滅磁電阻發(fā)熱消耗完成滅磁目的
逆變滅磁--是在滅磁命令發(fā)出后，勵磁調(diào)節(jié)器控制可控硅--通常是三相全控橋-的控制角大于90度，此時可控硅處于逆變狀態(tài)，它把勵磁繞組能量吸入到勵磁變壓器及定子消耗掉
通常 正常停機采用逆變滅磁--無機械動作，無火花，無污染，但如果調(diào)節(jié)器及可控硅等有故障將不成功；
保護動作滅磁應采用滅磁開關滅磁--強制滅磁--可靠，及時調(diào)節(jié)器及可控硅等有故障，也能成功滅磁。

康明斯發(fā)動機120馬力 的皮帶怎么裝？

皮帶套過風扇葉搭在風扇軸上，再套在水泵和發(fā)電機上，用專用工具（四方）別住漲緊輪，把皮帶安裝到漲緊輪下面，順便檢查漲緊輪是否轉動正常，如果漲緊輪不正常還會損壞皮帶的。

康明斯發(fā)動機皮帶輪軸承用什么潤滑油？

3 #鋰基脂，也就是黃油，最好用新品。應急時可以維修加注優(yōu)質(zhì)潤滑脂。及早更換原裝配件。

東風康明斯260發(fā)動機換四配套怎么下排氣漏淌機油？

1、機油加多了
換四配套時是否檢查了氣門，氣門積炭嚴不嚴重？
2、在維修廠確定的情況下，觀察一段時間，是否燒機油很嚴重；
如過依然很嚴重，悲劇告訴你可能活塞環(huán)上對口了

同步發(fā)電機并聯(lián)運行功率因數(shù)相差很大是怎么回事?

兩臺發(fā)電機并聯(lián)運行時，每臺發(fā)電機各自必須裝有無功調(diào)差裝置，而且應將兩臺發(fā)電機的調(diào)差率基本調(diào)整一致（一般控制在3%左右）。這樣在并聯(lián)運行時每臺發(fā)電機各自分擔相應的無功功率，就不會出現(xiàn)并聯(lián)運行時功率因數(shù)相差很大的情況。
      但如果兩臺發(fā)電機的調(diào)差率相差較大、或其中一臺（甚至兩臺都）沒有裝調(diào)差裝置的話，則其中特較硬的一臺（也就是調(diào)壓精度較高、調(diào)差率小或沒有裝調(diào)壓裝置）與特性較軟的一臺（安裝了調(diào)壓裝置且有一定調(diào)差率）就會產(chǎn)生無功功率分配不一致，也就是俗稱的搶無功而導致功率因數(shù)相差較大。

同步發(fā)電機自動穩(wěn)壓的調(diào)節(jié)與功率因數(shù)有關嗎？

較大容量的發(fā)電機電壓調(diào)節(jié)器是需測量定子電流的，也就是說與功率因數(shù)有關。

英國珀金斯柴油機燒機油換缸套活塞環(huán)不換活塞可行嗎？

一般燒機油換了缸套和環(huán)子效果就很好了，活塞如果沒有明顯的拉毛現(xiàn)象，環(huán)槽磨損不明顯，沒換問題不大，

威爾信柴油發(fā)電機組用柴油機缸套，活塞，活塞環(huán)都是新?lián)Q的，為何廢氣孔噴機油？

活塞環(huán)沒有壞而且是新?lián)Q，有可能是活塞環(huán)安裝問題，端口沒有旋轉180°，導致活塞漏氣，

沃爾沃柴油發(fā)動機剛大修過為什么機油會從發(fā)動機廢氣管噴出？

機油是否加多了。2.活塞環(huán)是否裝反了，或者裝錯了。

英國珀金斯柴油發(fā)動機燒機油的原因有什么？

環(huán).活塞.缸 磨損
氣門油封 損壞
缸墊密封失效泄漏
加入的機油量 超標

柴油機吊缸后，活塞環(huán)全部換新裝復后，該柴油機投入正常使用前應采取哪些措施？

肯定要磨合的，磨合要記住2點。
1：不要全速，中速以下。
2：不要憋車

康明斯發(fā)動機ISF2.8s3129T的點火正時怎么對？

需要專用工具的，有個凸輪軸定位板、曲軸定位銷和一個剛性的鏈條張緊器。方法：
1、拆去前端的真空泵和后面的鏈輪室蓋板，盤車使凸輪軸到正確位置，然后用凸輪軸蓋板定位，固定好螺栓。
2、松去后面的信號輪螺栓拆去鏈條。這是要把鏈條固定好，防止鏈條掉下去。曲軸前端的皮帶輪上有一個小孔，對應的后面也有個小孔。盤車使兩孔對其然后插上定位銷。
3、用裝好鏈條，和剛性鏈條張緊器，上好壓緊斑和螺栓。然后換上原裝張緊器，再還原即可。
康明斯柴油發(fā)動機廢氣管出柴油是什么原因？

有個別缸沒有工作,噴油咀噴到缸內(nèi),缸沒有工作,油就沒有燃燒,所以才會有這種現(xiàn)象

重慶康明斯柴油機排煙管發(fā)紅是什么問題？

是柴油后燃了，應該檢查一下氣門間隙和油嘴行程，如果是很久沒做過保養(yǎng)了，建議調(diào)校一下油嘴和油泵

電噴勞斯萊斯發(fā)電機負載帶不起，排煙管發(fā)紅冒黑煙是什么問題，這是什么問題引起的？

卡特發(fā)動機上有幾種傳感器？

1發(fā)動機冷卻液溫度傳感器、2進氣溫度傳感器、3大氣壓力傳感器、4渦輪增壓器出口壓力傳感器、5機油壓力傳感器、6燃油壓力傳感器、7高壓機油溫度傳感器、8噴射開啟壓力傳感器、9轉速傳感器（正時）、10環(huán)境壓力傳感器、11液位傳感器

卡特325c挖掘機水箱里進柴油什么原因？

噴油嘴下面的銅套壞了，換套就行了

東風康明斯180馬力發(fā)動機配什么型號增壓器？

HE221W, 廠家是無錫康明斯渦輪增壓

The principle of generator excitation system?

Excitation system mainly has:

1) according to the change of the generator load corresponding adjusting excitation current to keep the voltage of the machine for a given value;

2) run in parallel with controlling the generator reactive power allocation between;

3) improve the static stability of generators in parallel;

4) improve the transient stability of generators in parallel;

5) inside the generator fails to destroy, to reduce the damage degree;

6) according to the operation requirements of generator adopts a maximum excitation limit and the minimum excitation limit.

Magnetic method and use of excitation control system?

Main have magnetic switch peg magnetic, magnetic extinguishing inverter,

Magnetic, magnetic switch peg is Lord of the magnetic switch contacts disconnect before through a magnetic contact access peg magnetic resistance, also is to make the rotor circuit of parallel magnetic resistance, and then disconnect main contact, in the main contact disconnect after a magnetic switch due to peg magnetic contact put out the magnetic resistance in parallel with the rotor, the energy transfer to the excitation winding magnetic resistance heating consumption finish peg magnetic purpose

Inverter drop-out, is destroyed in the magnetic command is issued, silicon controlled excitation regulator control - usually three-phase fully-controlled bridge - control Angle is greater than 90 degrees, the thyristor in the inverter state, it put the energy into the excitation transformer and excitation winding of the stator consume

Normal downtime usually adopt inverter magnetic blow-out - with no mechanical movement, no spark, no pollution, but if there is a fault controller and SCR will not success;

Protections drop-out should use magnetic switch peg magnetic - forced out the magnetic - reliable, regulator and silicon controlled rectifier has a fault in time, can also succeed magnetic blow-out.

Cummins engine with 120 horsepower belt?

Belt set a fan blades on the fan shaft, then set on the pumps and generators, use special tools (the quartet) don't live, when tight round to install belt in tight round here, by the way, check up tight round rotation is normal, if rise tight round abnormal will damage the belt.

What cummins engine pulley bearing lubricating oil?

3 # lithium base grease, i.e., butter, best new product. Can repair filling high quality grease when emergency. Replace the original accessories. As early as possible

Dongfeng cummins engine in 260 four auxiliary exhaust discharge under drip oil?

1, oil plus much more

In four supporting when check the valve, the valve carbon deposit is not serious?

2, in the case of a repair shop to determine and observe for a period of time, whether the oil burning is very serious;

Is still very serious, if the tragedy may tell you counterpart on the piston ring

Difference in synchronous generator in parallel operation of power factor is how to return a responsibility?

Two generator in parallel operation, each generator must be equipped with reactive tuning device, and two basic adjustment generator of adjustable rate should be consistent (general control in 3%). So that each generator in parallel operation share the corresponding reactive power, won't appear parallel runtime power factor vary widely.

But if the two generator of adjustable rate is large, or one of them (or even two) no controlled devices, is among them, a hard one (that is, high precision voltage regulator, voltage regulation device with adjustable rate little or no) with soft features a (install a pressure regulating device and has a certain adjustable rate) can produce reactive power distribution, which is commonly called rob reactive power and power factor is large.

Synchronous generator automatic voltage regulation and power factor?

Larger capacity of the generator voltage regulator is to measure the stator current, that is related to the power factor.

The British perkins diesel engine burning oil cylinder liner piston ring do not change the piston feasible?

General oil burning in the cylinder liner and ring effect is very good, the piston if there is no obvious phenomenon, hair ring groove wear is not obvious, not in question is not big,

Will letter diesel generator sets diesel engine cylinder liner, piston, piston rings are new change, why waste gas hole spray oil?

Piston ring is not bad and it is the new change, may be a piston ring installation problem, the port is not rotated 180 °, cause the piston air leakage,

Volvo diesel engine just overhaul why oil from the engine exhaust pipe jet?

The oil is added. 2. The piston ring is installed backwards, or wrong.

Reasons for the British perkins diesel engine to burn oil have?

Ring. The piston cylinder wear

Valve seal is damaged

Cylinder gasket seal failure

Add the oil quantity to exceed bid

Diesel engine after lifting cylinder, piston ring, after all a make-over after the diesel engine is put into normal use what measures should be taken before?

Bound to running-in, running-in remember 2 points.

1: don't at full speed, medium speed.

2: don't hold back the car

Cummins engine ISF2.8 s3129T ignition timing how to?

Need special tools, crankshaft positioning pin and a CAM shaft positioning plate, a rigid chain tensioner. Methods:

1, the vacuum pump down the front and the back of the sprocket wheel chamber cover, barring the camshaft to the correct position, then use the camshaft cover plate positioning, fixed bolts.

2, went to the back of the signal wheel bolt down the chain. This is to put the chain fixed well, prevent the chain fall. Crankshaft pulley of the front has a small hole, also have a hole at the back of the corresponding. Turning to make two holes and then plug in locating pin on it.

3, packed with the chain, and rigid chain tensioner, good compression and bolts. And then changed into original tensioner and reduction.

Cummins diesel engine exhaust pipe out is what reason?

Without work, have individual cylinder injection nozzle spray in the cylinder, the cylinder has no job, no burning oil, so just can have this kind of phenomenon

Chongqing cummins diesel engine exhaust pipe flushing is what problem?

Is after the diesel combustion, should check the valve clearance and nozzle schedule, if it is long time no doing maintenance, suggested that the set-up the nozzle and oil pump

Efi generator load with Rolls-Royce, exhaust pipe is red smoke is what problem, what's the problem cause?

Carter there are several kinds of sensors on the engine?

1 engine coolant temperature sensor, air intake temperature sensor 2, 3, atmospheric pressure sensor, 4 turbine supercharger outlet pressure sensor, oil pressure sensor, 6 fuel 5 7 high pressure oil pressure sensor, temperature sensor, 8 injection opening pressure sensor, speed sensor (timing), 9 of 10 environmental pressure sensor, liquid level sensor

Carter excavators tank into the diesel 325 c what reason?

Nozzle under the copper set is broken, change sets

Dongfeng cummins engine with 180 HP what type supercharger?

HE221W, manufacturer is wuxi cummins turbo