Basic knowledge of diesel generator sets

Diesel engines and generators on a common basis of technical knowledge unit class, as early as a few years ago we were in the form of questions and answers are universal release, should now be a part of the user request once again retransmission, because of the technology update and development, the following content is for reference only:

1, diesel generator sets of basic equipment including which six systems? Answer: (1) oil lubrication system; (2) fuel system; (3) control and protection system; (4) cooling heat system; (5) exhaust system; (6) starting system;

2, why do we recommend the customer to use the oil recommended by the professional company in the sales? Answer: oil is the engine of blood, once the customer uses unqualified oil will cause the engine bearing, gear, gear scuffing occurred crankshaft deformation serious accidents, breaking the whole machine until scrapped. Specific oil selection and use notes, see the relevant articles in this edition.

3, why should the new machine use oil and oil filter after a period of time? Answer: the new machine in the running in period, it is inevitable that impurities into the oil sump, so that oil and oil filter physical changes or chemical changes. Sold by Wuhan Jieli unit in customer service and customer service in the package process, we will be performed by professional maintenance related to you.

4, why do we require customers to install the unit, the exhaust pipe down 5-10 degrees? Answer: mainly to prevent rain water into the exhaust pipe, leading to major accidents.

5, the general diesel engine is equipped with manual oil pump and exhaust bolt, what is its function? Answer: before launching, remove the air in the fuel pipe.

6, diesel generator unit automation level how to divide? Answer: manual, self starting, self starting, plus automatic city electricity conversion cabinet, long-distance three remote (remote control, telemetry, remote monitoring)

7, why is the generator's outlet voltage standard 400V instead of 380V? Answer: because the line after the line there is voltage drop loss.

8. Why must the site of the diesel generator set be air free? Answer: the output of the diesel engine is directly affected by the amount of air inhaled and the quality of the air. The generator must also have sufficient air for cooling. Therefore, the use of the site must be smooth air.

9, why in the installation of oil filters, diesel filters, oil-water separator, should not use tools to turn the above three too tight, and only need to hand spin until the oil can not leak? Answer: because if the spiral is too tight, its sealing ring is heated by the oil bubbles and the body temperature, it will heat up and produce great stress. Causing damage to the filter housing or separator shell itself. What is more serious is the damage to the body so that the nut is unable to repair.

10, how to identify counterfeit and shoddy domestic diesel engine? Answer: first check whether the factory certificate and product certification, they are diesel engine factory "identity certificate" is necessary. Check the three No. 1 on the certificate) the nameplate number;

2) airframe number (in kind generally in the flywheel end mechanical cutting plane, the font is convex body); 3) the oil pump nameplate number. Check the three numbers against the actual number on the diesel engine. You must be accurate. If you find any doubt, you can verify the three serial numbers to the manufacturer.

11, operation electrician took over diesel generator sets, first of all to verify what three points? Answer: 1) verify the actual useful power of the unit. Then determine the economic power and standby power. The approved method for real power units: diesel engine rated power for 12 hours by 0.9 to get a data (kw), if the generator rated power is less than or equal to the data, with rated power generators for the unit real power, if the rated power generator in the data, you must use the data as true the useful power unit.

2) to verify what kind of self-protection function of the unit. 3) to verify whether the power line of the unit is qualified, whether the grounding is reliable and whether the three-phase load is basically balanced.

12, there is an elevator starter motor for 22KW, should be equipped with a large generator set. Answer: 22*7=154KW (elevator for the direct load start type, instantaneous start current is generally 7 times the rated current),

To ensure that the elevator moves at uniform speed. (that is, at least 154KW generator sets)

13, how is the optimal power (economic power) of the generator set calculated? Answer: P best =3/4*P rated (that is, 0.75 times rated power).

14, the state stipulates that the engine power of a general generating set should be larger than that of the generator Answer: 10 percent.

15, some generator unit engine power expressed by horsepower, horsepower and the international unit of kilowatt between how to convert? Answer: 1 horsepower =0.735 kW, 1 kW =1.36 horsepower.

16. How is the current of the three-phase generator calculated? Answer: I = P (V / 3 Ucos phi) is the current power (W) = (V / 3 *400 (V) * 0.8).

The simplified formula is: I (A) = Unit rated power (KW) * 1.8

17. What is the relationship between apparent power, active power, rated power, maximum power and economic power? Answer: 1) the unit of apparent power is KVA, our country

It is used to express the capacity of transformers and UPS.

2) the active power is 0.8 times the apparent power, and the unit is KW. Our country is used to power generation equipment and power equipment. 3) rated power of diesel generator sets

Refers to the power that can be continuously operated in 12 hours.

4) maximum power is 1.1 times the rated power, but within 12 hours only allow 1 hours.

5) the economic power is 0.75 times of the rated power, which is the long-term output power of the diesel generator set without time limitation. At this power operation, the combustion

Lowest oil consumption and lowest failure rate.

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