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Title: About the diesel generator set 56 Technology Answers
Time: 2013/7/11 11:25:34
One, two units and machines use what are the conditions? What to do with the device and machine work?
A: and machine used on condition that two machines instantaneous voltage, frequency, phase identical. Commonly known as the "three simultaneous." With special equipment and machines and machine work done. General recommendations using automatic and cabinets. Try not manually and machine. Because the manual and the machine depends on the success or failure of human experience. The author of over 20 years experience in electrical work boasted bold, diesel generator manual and machine reliability success rate is equal to 0. Must not be used in city TV manual and machine power system to apply the concept of a small power system, because they do completely different level of protection.

2, three-phase generator power factor is how much? To improve the power factor can be added to the power compensator do?
A: The power factor of 0.8. No, because the capacitor charging and discharging causes small power fluctuations. And crew oscillation.

3, why do we require customers to the unit after every 200 hours of operation, to carry out a tightening all electrical contacts work?
A: The diesel generator is a vibrating worker. And a lot of domestic production or assembly of units of the double nut useless. The spring washers useless, once electrical fasteners loose, will produce large contact resistance, resulting in the unit is not operating properly.

4, Why generator room must be clean, ground without quicksand?
A: If inhaled diesel engine will power down the dirty air; generator if inhaled sand and other impurities will make the gap between the stator and rotor insulation damage, severe cases lead to burnout.

5, why since 2002, I generally do not recommend that users install using neutral ground?
Answer: a) a new generation of self-regulatory function generator greatly enhanced;
2) practice found neutral ground crew lightning failure rate is high.
3) Grounding higher quality requirements, the average user can not be done. Unsafe working ground as ungrounded.
4) neutral ground crew will cover the load and the ground fault leakage faults, and these faults and errors in the case of City TV current supply can not be exposed.

6, ungrounded unit, should pay attention to what is the problem?
Answer: 0 lines may be charged, because the hot and neutral point between the capacitor voltage can not be eliminated. The operator must, as the 0 line is electrified. Not used to dealing with at the mains.

7, UPS and diesel generator to power facilities, to ensure the UPS output stable?
Answer: 1) UPS generally used Apparent Power KVA said first multiply it by 0.8 and generator active power translated into consistent units KW.
2) The use of general generators, places UPS active power multiplied by two to determine the distribution generator power, the generator power for the UPS power twice.
3) the use of a belt PMG (PMG) generators, places the UPS power multiplied by 1.2 to determine the generator power, generator power that is 1.2 times the UPS power.

8, indicating voltage 500V electronic or electrical components, diesel generator control cabinet can be used to do?
A: No. Because diesel generator 400/230V voltage is indicated on the effective voltage. The peak voltage of 1.414 times the effective voltage. Namely diesel generator peak voltage Umax = 566/325V.

9, all of the diesel generator sets with self-protection function do?
Answer: It is not. Currently on the market even within the same brand as the unit of some with and some without. The user must purchase the unit yourself clear. Best written as an appendix written materials. Generally are not cheap machines with self-protection function.

10, how to identify counterfeit and shoddy domestic diesel engine?
A: First check whether the factory certification and product certification, they are diesel engine factory "identity" is a must have. Then check the certificate of the three number 1) plate number; 2) the serial number (usually in the flywheel on physical mechanical cutting off the plane, the font is a convex body); 3) oil pump plate numbers. These three numbers and the actual numbers matching engine, must be accurate. If there are doubts these three numbers can be verified at the manufacturer.

11, took over the operation of electric diesel generator set, first to verify what three points?
A: 1) to verify the real useful power unit. Then determine the economic power, and standby power. Real useful power unit of the approved method: diesel 12 hours multiplied by 0.9 to arrive at a rated power of data (kw), if the generator rated power less than or equal to the data, places the generator rated power be real useful power for the unit, If the generator rated power is greater than the data, you must use this data as a real useful power unit.
2) to verify which of several units with self-protection function.
3) verify the unit's electrical wiring is qualified, protective grounding reliability, three-phase load is basically balanced.

12, there is an elevator starter motor is 22KW, how much should be equipped with generators?
Answer: 22 * 7 = 154KW (elevator starts directly with load models, instantaneous starting current is usually seven times the rated current, in order to ensure uniform motion elevator). (Ie, at least should be equipped with 154KW generator sets)

13, the optimum use of power generators (economic power) how to calculate?
A: P best = 3/4 * P rated (ie 0.75 times the rated power).

14, the state provides general turbine engine power should be much greater than the generator power? Answer: 10 ℅.

15, some power generating units with a horsepower engine that horsepower and how do you convert between international unit kilowatt?
A: 1 hp = 0.735 kilowatts, 1 kilowatt = 1.36 hp.

16, how to calculate the current three-phase generator?
A: I = P / (√ 3 Ucos φ)
Ie current = power (watts) / (√ 3 * 400 (V) * 0.8).
Simple calculation formula is: I (A) = unit rated power (KW) * 1.8

17, apparent power, active power, rated power, maximum power, the relationship between economic power?
Answer: a) The unit of apparent power KVA, our habits for expressing the capacity of transformers and UPS.
2) active power is 0.8 times the apparent power, the unit is KW, our habits for power generation equipment and electrical equipment.
3) diesel generator rated power is 12 hours of continuous operation of power.
4) Maximum power 1.1 times the rated power, but only allow 12 hours for 1 hour.
5) Economic power is the rated power of 0.75 times that of diesel generator sets no time limit can be long-running output power. In the power operation, the fuel most provinces, the lowest failure rate.

18, why not let the diesel generator rated power at less than 50% of the long-running case.
A: The oil consumption increased coking diesel engine easily, increasing failure rate, shorten the overhaul cycle.

19, the generator runtime actual output power with a power meter or in the meter prevail prevail?
A: In the ammeter prevail, power meter reference only.

20, one of the sets of the frequency and voltage instability The problem is that the engine or generator?
A: is the engine.

21, one of the sets of frequency stability, voltage instability The problem is that the engine or generator?
Answer: that generators.

22, loss of excitation is how it is, how should deal with?
A: The generator not a long time, resulting in the factory with the residual magnetism in the core loss, the excitation coil can not be established due to the magnetic field, when the engine is running properly, but unable to pay electricity, such a phenomenon new machine. Or long-term need for more units.
Treatment methods: 1) there is a button click exciter excitation buttons, 2) non-excitation buttons, with a battery of its magnetization, 3) with a lamp load, speed run for a few seconds.

23, generator sets used for some time and found all the rest is normal but power down, mainly due to what?
Answer: a, dirty air filter, intake air is not enough, then have to clean or replace the air filter.
b, the fuel filter is dirty, the fuel injection quantity is not enough, to be replaced or cleaned.
c, ignition timing is not correct, need to be adjusted.

24, there is a generator with load after its voltage and frequency are stable, but the current instability, the problems lie?
A: The problem is that the customer's load is unstable, while the generator quality is absolutely no problem.

25, one of the sets of frequency instability, the main problems lie?
A: The main problem is that the generator speed is unstable.

26, diesel generator sets in use critical points must be noted that what?
Answer: a) must be sufficient water in the tank and keep the allowable temperature range.
2) lubricating oil must be in place, but not excessive, and to maintain the pressure within the allowable range.
3) Frequency stability at around 50HZ, voltage stability at around 400V.
4) three-phase currents are within the rated range.

27, diesel generators require frequent replacement or cleaning of parts with which a few?
A: diesel filters, oil filters, air filters. (Individual units as well as water filters)

28, brushless generator What are the main advantages?
A: (1) replacing the carbon brushes maintenance;
(2) anti-radio interference;
(3) reduce the loss of field failures.

29, insulation class domestic generators generally much?
A: The domestic machine class B; Marathon and Leroy Somer brand brand brand and the history of Dan Fu is H level.

30, what is needed gasoline engine fuel petrol, oil mixed?
A: The two-stroke gasoline engine.

31, basic equipment including diesel generator sets which six systems?
Answer: (a) oil lubrication system;
(2) Fuel System;
(3) control and protection system;
(4) cooling cooling system;
(5) The exhaust system;
(6) starting system;

32, why do we try to work in sales recommends that customers use our recommended oil?
A: Oil is the blood of the engine, once the customer use of substandard engine oil can cause bearing seizure occurs, the gear teeth to fight, crankshaft deformation fracture and other serious accidents, until the whole machine scrapped.

33, why the new machines need to be replaced after a period of using oil and oil filter?
A: The new machine will inevitably be in the running period of impurities into the machine sump, oil and oil filter to make qualitative changes occurring physical or chemical qualitative change.

34, why do we require customers to install the unit, the exhaust pipe to downward 5-10 degrees?
A: to prevent rainwater from entering the exhaust pipe, causing major accidents.

35, the general diesel engines are equipped with manual pumps and exhaust bolts, what is its role? A: The fuel tube for launch before the exclusion of air.

36, diesel generator sets automation level how to divide?
A: Manually, from the start, from the start plus Automatic Mains conversion cabinet, remote three remote (remote control, telemetry, remote monitoring.)

37, why the generator voltage standard 400V outlet instead of 380V?
A: Because the line after qualifying a voltage drop losses.

38, why requires the use of diesel generators air space must be smooth?
A: The output of the diesel engine directly affected by the intake air quantity and the quality of the air, and the generator must be given sufficient air cooling. So the site must use the air flow.

39, why is installed oil filter, diesel filter, water separator should not be more than three devices with a tool to screw too tightly, but do not just hand turned to oil spills can be?
A: Because if it screwed too tightly seals by Youpao and body temperature under the effect of thermal expansion will generate a lot of stress. Cause the filter housing or separate shell itself is damaged. Even more serious is the damage causes the body Luo mother beyond repair.

40, customers buy from the start, but not yet purchased will automatically switch cabinet What are the benefits?
A: 1) Once a city network power outage occurs, the unit will automatically start to speed manual transmission time;
2) If the front end of the air switch can also be connected to a lighting line ensure that the room lighting impact of power outage, to facilitate the work of the operator;

41, generator sets to meet any conditions before switch on power transmission?
A: The water-cooled units, the water temperature reaches 56 degrees Celsius.
Air cooling unit, the body slightly hot.
No-load voltage frequency is normal. Oil pressure is normal. Before closing transmission.

42, the boot sequence with load after power is what?
A: Load descending order belt.

43, the shutdown sequence before unloading what?
A: Remove the load from small to large order, the last shutdown.

44, why not take the load off the boot?
A: with load shutdown is an emergency shutdown of the unit greater impact. An illegal operation with load power electrical equipment for power generation equipment will bring damage.

45, winter use of diesel generators should pay attention to what?
A: 1) Note that the tank must not freeze prevention methods plus dedicated long-term protection, antifreeze, or the use of electric equipment to ensure the temperature above freezing.
2) non-fire baking.
3) Warm-up time to empty a little longer before transmission.

46, the so-called three-phase four-wire system is how the matter?
A: There are four generator outlet, where three of the line of fire, a zero line. FireWire and the FireWire voltage between 380V. Between the hot and neutral lines to 220V.

47, three-phase short-circuit is how the matter? What will happen?
A: Firewire without any load between the direct three-phase short-circuit is shorted. Its terrible consequences, a serious cause of the plane crash.

48, the so-called inverted power transmission is how is it? Which two will produce serious consequences?
A: self-generating power transmission unit to the city network situation called inverted transmission. Its serious consequences in two ways:
a) No blackout city network, its market power and self-generating power network generates asynchronous and machine, will destroy the unit. If the self-generating larger capacity, but also to the city network flapping.
b) City Network has blackout is maintenance, power transmission down their own generators. Will make the electricity sector maintenance personnel electrocuted.

49, why commissioning personnel must be fully checked again before commissioning the unit fixing bolts are fixed intact? All line interface is intact?
A: After a long-distance transport unit, and sometimes it is inevitable that Luo bolt and line interface loose or fall off, the light affect debugging, heavy damage to the machine.

50, power belongs to which level of energy? AC characteristics?
A: The power belongs to two energy, mechanical energy is converted over from the alternating current, direct current from the chemical energy transformed, is characterized by alternating current can not be stored, are found with.

51, domestic generators universal symbol GF What does it mean?
A: represents two important meanings:
a) frequency generator that is suitable for China's general power 50HZ generator sets.
b) domestic generators.

52, the load carried by the generator in use must be kept three phase you?
A: Yes. Maximum deviation may not exceed 25% of the non-phase operation.

53, four-stroke diesel engine which is four strokes?
A: Inhale, compression, power, exhaust.

54, diesel and gasoline engines where the biggest difference?
A: 1) cylinder pressure thing differently.
Stage of the compression stroke engine is compressed air;
Stage of the compression stroke gasoline engine gasoline and air mixture is compressed.
2) Ignition in different ways.
Sprayed diesel engine relies on high-pressure gas atomization spontaneous combustion;
Relying on a spark plug ignition gasoline engine.

55, the power system of the "two votes, three systems" specifically refers to what?
Answer: two tickets and ticket refers to the work operation ticket. Electrical equipment that is carried out on any work operation. Must first obtain a certificate issued by the responsible duty job ticket and ticket operations. The parties must execute ticket.
Three systems refers to the shift system, mobile inspection system, the device periodically switching system.

56, the world's first practical diesel engine was born when, where, inventions Who? Current status?
A: In 1897 the world's first diesel engine was born in Augsburg, Germany (Augsburg), by MAN company founder Rudolf Diesel invented. Diesel is the English name of the current name of the founder of Diesel.
MAN Company is the world's most professional diesel engine manufacturing company, unit capacity can be up to 15000KW. Is the main driver of the ocean shipping industry suppliers. China's large diesel power plants also rely on MAN company, such as Guangdong Huizhou Dongjiang plant (100,000 KW). Foshan plant (80,000 KW) are provided by the company MAN units.
Currently, this world's first diesel is stored in the German National Museum exhibition hall.
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