Reasons for unbalanced three-phase load of 400kw generators

Why is the three-phase load of 400kw diesel generator unbalanced? Today Starlight Power answers for you.

Here are some reasons:

1.One phase of the 400kw generator and its circuit occurs phase loss, or one phase of its circuit breaker is in poor contact.

2.A power transmission sequence is in incomplete operation.

3.Single phase of the system is overloaded(if there is a single-phase load with large capacity).

4.The failure of stator ammeter and circuit of electric energy metering device also contribute to the indicative asymmetry of three phase ammeter.

Hazards of the unbalanced three-phase load of diesel generator.

1.It will undermine the operational output of the equipment. The design for capacity of the generator is fixed according to the three-phase load, so that the equipment takes the largest phase in it as the limit in consequence of the three-phase unbalance, and lead to the inefficient operation of the equipment.

2.When electricity goes through the neutral line, wastage of the low voltage line increases.

3.It will lead to the asymmetry of three-phase voltage and the displacement for electric potential of neutral point.

4.Excessive neutral current will rise the temperature of power transformer when it is in service, and will burn it out at worst.

5.It is able to undermine the output power of the generator, and rise the winding temperature.

6.It will make the voltage of some phases high and others low.

7.When the neutral line is overcurrent, the alien line might be burn out.

How to solve the problem of unbalanced three-phase load?

When the 400kw generator overruns under the three-phase imbalance load, you should immediately reduce the load of the generator set to make the unbalanced current lower than the allowed value and report to the system control. After the three-phase current becomes balanced, you can increase the load of the generator set according to the dispatching order. The current difference of the three phases must be lower than the 20% of rated current, and current of any phase must be of below rated value. The negative-sequence current goes through the generator must be less than 12% of the rated current.

To better learn about the 500kva diesel generator and make a right decision in purchasing, the three-phase loads and single-phase load will be introduced here:

1.Three-phase load

Three-phase loads are defined as providing power source for the operation of power-driven equipment with three phases. The three-phase loads can fall into the balance of three-phase loads and the imbalance of three-phase loads.

The differences are as follow: the balance of three-phase loads sees similar values of current for the three phases; the imbalance of three-phase loads sees great different values of current for the three phases, and the phase with overcurrent is prone to cause a fire.

2.Single-phase load

Single-phase load is defined as the one or more impedances that are set in the two lines of the three-phase power source. It can also be deemed as a peculiar asymmetric three-phase loads. Electric locomotive is a classic example of it. In order to ensure the basic balance of three-phase loads, all the single-phase load will be evenly set in the three phases.

In a word, the single-phase means using a phase, which is commonly known as live wire, and a null line to provide power source for the operation of the electric appliance.

Therefore, when make a decision on the purchase for a diesel generator, whether the load of the generator is three-phase or single-phase should be confirmed. In doing so, imbalance in the load of a generator in service can be avoided, so as to make certain of the safe and stable operation of the generator set.

Being established in 1974, Jiangsu Starlight Electricity Equipments Co., Ltd. is a manufacturer for diesel generator sets. We are committed to the production of high-quality diesel generator sets, providing products including Cummins, Perkins, Volvo, Deutz, Yuchai, SDEC, Weichai, Ricardo, MTU and the likes, with the power range from 20 KW to 3000 KW. For more information, please contact us by e-mail sales@dieselgeneratorech.com or telephone +86 13481024441.

Sensors of Soundproof Diesel Generators

Sensors are very important for diesel generator set to monitor data by control panel. If incorrect use and selection, the diesel generator set may cause faults. Today Starlight Power will introduce the sensors of diesel generators. Hope the article is helpful to you.

What is main sensor in a 200KW diesel generator?

1.Oil pressure sensor.

Its function is mainly to monitor oil pressure, then we can know the capacity of oil. If the lubricating oil is less, the wear of the generator set will increase, resulting in the reduction of the service life of the diesel generator set.

2.Coolant temperature sensor.

Its function is mainly to monitor coolant temperature, so that we can know whether the temperature of the water tank exceeds the normal value. Normal value is generally 85℃. If the temperature of the water tank is too high, the cylinder block will be heated too high, which will damage the diesel generator set and cause power failure.

3.Speed sensor.

Its function is mainly to monitor whether the flywheel speed of diesel generator set is fixed 1500 or 1800 rpm. To ensure the normal voltage and frequency of diesel generator set. If the speed of the generator set is not normal, then the voltage and frequency of the diesel generator set will not be normal, and other equipment will not be able to use normally.

Cummins diesel generator

Different diesel engine brand, the type and number of sensors configured are different. Here we introduce another sensors.

4.Intake air temperature sensor.

This is mainly for EFI diesel engine. Detect the intake air temperature and provide it to ECU as the basis for calculating the air density. The function of the intake air temperature sensor is to measure the temperature of the air entering the intake manifold. In the volumetric flow intake system, the electronic control unit (ECU) modifies the injection quantity according to the intake air temperature to obtain the best air-fuel ratio. The intake air temperature sensor also helps to calculate the injection quantity more accurately. The air temperature determines the air density. That is to say, when the volume of cold air and hot air is the same, the quality of cold air is heavier. Therefore, when absorbing cold air, there is more oxygen in the combustion chamber and the injection time is longer.

5.Exhaust gas temperature sensor.

Commonly used exhaust temperature sensors are thermistor type and thermocouple type. Because of the high exhaust temperature of diesel engine, the thermistor sensors used to measure the exhaust temperature are generally high temperature devices. Zirconium solid electrolyte sensors and electronic conduction sensors are commonly used. When using the thermocouple, there is no need for external power supply, but the electromotive force is generated by the temperature of the welding parts of the two alloys. But this kind of electromotive force is not directly related to the concave and convex of temperature, but is related to the difference between the detected temperature and the ambient temperature, which should be paid attention to when using. Generally, the electronic control system of small and medium diesel engines is not equipped with this kind of sensor.

6.Fuel pump speed sensor.

7.Lube oil temperature sensor. Its founction is mainly to monitor temperature of lube oil. When the temperature is high, the controller will send a alarm indication.

8.Return oil temperature sensor.

9.Fuel level sensor. Its founction is mainly to monitor diesel fuel level. When fuel level is lower than set value, the controller will send a alarm indication.

The diesel generator can give us pre-alarm by the above sensors, so that we can maintain genset in time to avoid faults and damage. Above sensors can be equipped according to customers’ requirements, when you send inquiry to diesel generator manufacturers, you can require.

We are a manufacturer of diesel generator set in Jiangsu China, having 46 years’ production experience, product covers Cummins, Perkins, Deutz, Yuchai, Shangchai, Wechai, Ricardo, MTU, Doosan etc. Power range is from 20kw to 3000kw. If you have plan to purchase, welcome to contact us by email: sales@dieselgeneratortech.com or call us +8613481024441 (same as WeChat number).

What is the method to clean water tank of genset

The radiator plays an important role in ensuring the normal operation of the diesel generator set. If it is not used properly, it will damage the diesel engine and generator set. If it is more serious, it may lead to the scrapping of the diesel engine. 

Regular maintenance can ensure radiator work normally. Today Starlight Power mainly talks about the clean methods of radiator, hope this article is helpful to you.

How to clean radiator in diesel generator set?

After a long term use of radiator, the most important is to clean it. Radiator cleaning is divided into external cleaning and internal cleaning. This is a very important link, which will directly affect the use effect of the radiator, and then affect the use of the whole generator set.

The gap of the radiator of generator set working in the open air may be blocked by debris, insects and other debris. We can often use low-pressure hot water (appropriate addition of cleaning agent) for spray washing, pay attention to the steam or water from the front of the radiator to the fan spray. When spraying, cover the diesel engine and alternator with cloth. If the deposit is difficult to remove, remove the radiator and soak it in hot alkaline water for about 20 minutes, then rinse it with hot water.

The radiator of diesel generator set will produce scale when it is used for a long time. In order to ensure the heat dissipation effect of cooling system of diesel generator set, we need to clean the water tank of diesel generator set regularly. The radiator of Starlight Power usually use Wei Chuang brand, here Starlight Power tell you how to clean it.

Firstly, pour 30kg water, 2.5kg caustic soda and 0.6kg kerosene into the water tank.

Secondly, start the diesel generator set. Turn off the diesel generator set after running at medium speed for about 10 minutes. After 10-12 hours, start the diesel generator set again, and stop the engine after running at medium speed for about 10 minutes.

Finally, control the cleaning liquid in the water tank, add clean cooling water, start the diesel generator set, operate at medium speed to make the diesel generator set clean by itself, and repeat 2-3 times to remove the scale in the water tank of the diesel generator set.

In order to ensure the service life of the diesel generator set and reduce the failure rate, we should regularly maintain the diesel generator set. And we should also pay attentions below:

During the operation of the generator set, the coolant in the cooling radiator is usually very hot and has pressure. Therefore, it is strictly forbidden to clean the radiator or remove the pipe when it is not cooled, let alone operate the radiator or open the fan protective cover when the fan is rotating.

Corrosion is the main cause of radiator failure. It is suggested that the pipe joints should be checked frequently to avoid leakage, and the water tank should be filled regularly to drain the air in the system. The cooling water tank should not be in the condition of partial water injection and discharge, because it often accelerates the corrosion process. For the generator set that doesn’t work, the water tank should be emptied or filled completely. If conditions permit, it is best to use distilled water or natural soft water, and add an appropriate amount of antirust agent.

What is the function of radiator in diesel generator set?

1.The air inlet baffle and louver should be able to adjust the gas flow during operation (for example, the louver assembly with narrow blades has greater resistance than that with wide blades).

2.When the generator operates in cold climate, the air intake valve of diesel engine should be closed. When the diesel generator starts, all the inlet and outlet on-off valves should be opened; when the air temperature is higher than 16℃, all the circulation control valves should be closed.

3.Except that the cooling air is allowed to be recycled in the machine room in the cold climate, the rest of the ventilation air should be directly discharged to the outside, and it is strictly prohibited to heat other rooms (except the generator room).

4.Radiator is necessary to use elastic pipe joint to absorb displacement and vibration of diesel generator set. Regularly check the technical status of front wheel alignment and steering device. Regular inspection and adjustment of front wheel alignment, front wheel bearing clearance and steering device is an important measure to reduce tire wear and deformation damage of walking parts. Check according to the required value of each type of tractor and adjust it if necessary. Pay more attention to the fixed clearance of the front wheel knuckle and the tie rod nut, especially the front wheel.

5.The daily maintenance of diesel generator is very important. Keep all parts clean, and check the fastening of hub bolts, nuts, split pins and other parts frequently to ensure the fastening is reliable. Add grease to the swing shaft sleeve, front wheel shaft and steering knuckle every shift; regularly check the oil level of belt pulley, guide wheel and supporting wheel, add lubricating oil if necessary, and regularly clean and change the oil as required. Only in this way can the service life of generator set be improved.

6.In order to reduce the noise of the fan and the bad influence of the external wind, the baffle should be added near the ventilation inlet and outlet.

Hope this article can let you know more about radiator of diesel generator. Starlight Power is also a manufacturer of diesel generator, who has its own two factories in Jiangsu China with strong production ability, processional technical team and after-sales service team. Welcome to contact us by email sales@dieselgeneratortech.com for more diesel generator information. 

What should we do to solve faults of AC generator

AC alternator is an important part in diesel generator, if it has faults, whole diesel generator can not work. Some customers asked question about this last time, so Starlight Power will answer details about the common faults of AC alternator, hope this article is helpful to everyone.

A.There is abnormal voltage between alternator neutral line and ground.

1.Under normal condition, due to the influence of high-order harmonics or manufacturing process, the air gap under each magnetic pole is uneven and the magnetic potential is unequal. If the voltage is between one and several volts, there will be no danger and it is not necessary to deal with it.

2.The alternator winding has short circuit or poor insulation to the ground, which leads to the deterioration of electrical equipment and alternator performance and easy to heat up. Therefore, timely maintenance should be carried out to avoid the expansion of the accident.

3.There is no voltage between neutral line and ground under no-load, but voltage appears when there is load, which is caused by three-phase imbalance. Therefore, three-phase load should be adjusted to make it basically balanced.

B.Alternator overheating.

1.The alternator does not operate according to the specified technical conditions. Over high stator voltage, iron loss increasing, too large load current, startor winding cooper loss increasing, too low frequency, those factors will slows down the cooling fan speed, affect the alternator heat dissipation. And too low power makes the rotor excitation current increase, resulting in rotor heating.

2.The three-phase load current of the alternator is unbalanced, and the overload one phase winding will overheat; if the difference of the three-phase current exceeds 10% of the rated current, it is a serious unbalanced phase current. The unbalanced three-phase current will produce negative sequence magnetic field, thus increasing the loss and causing the heating of the pole winding and ferrule. The three-phase load should be adjusted to keep the current balance as much as possible.

3.The air duct is blocked by dust and the ventilation is poor, which makes heat radiation difficult. We should clean dust and oil dirt to make the air duct unobstructed.

4.Air intake temperature is too high or water intake temperature is too high, cooler is blocked. We should cool down Air intake temperature and water intake temperature, and remove the blockage in the cooler. Before troubleshooting, we should limit the load of alternator to reduce the temperature of alternator.

5.Too much or too little grease for bearing. Grease should be added according to the regulations, usually 1/2 ~ 1/3 of the bearing chamber (the upper limit for the lower speed and the lower limit for the higher speed), and it should not exceed 70% of the bearing chamber.

6.Bearing wear. If not serious wear, will make bearing overheated locally. If serious wear, it may cause friction between stator and rotor, resulting in overheating of stator and rotor. We should check whether there is noise in the bearing. If friction between stator and rotor is found, stop the machine immediately for maintenance or replace the bearing.

7.The insulation damage of stator core will cause the short circuit between pieces, which will increase the eddy current loss of the iron core and generate heat. In serious cases, the stator winding will be damaged. Stop the machine immediately for maintenance.

8.The parallel conductor of stator winding is broken, which makes the current of other wires increase and generate heat. Stop the machine immediately for maintenance.

C.Alternator overcurrent.

1.Overload. We should reduce load.

2.In case of phase to phase short circuit or grounding fault of transmission line, the line should be overhauled, and it can return to normal after troubleshooting.

D.Generator terminal voltage too high.

1.If the grid voltage of the generators paralleled with the power grid is too high, the voltage of the generators in parallel should be reduced.

2.If the fault of excitation device causes over excitation, the excitation device should be repaired in time.

E.Insufficient power.

Due to insufficient compound excitation compensation of voltage source of excitation device, the excitation current required by armature reaction can not be provided, so that the generator terminal voltage is lower than the grid voltage and the rated reactive power cannot be delivered. The following measures should be taken:

1.A three-phase voltage regulator is connected between the generator and the excitation reactor to increase the terminal voltage of the generator and gradually increase the magnetic potential of the excitation device.

2.By changing the phase between the voltage and magnetic flux potential of the excitation device and the voltage at the generator terminal, the resultant total magnetic flux potential can be increased, and a resistance of several thousand Ω and 10W can be paralleled at both ends of each phase winding of the reactor.

3.Reducing the resistance of rheostat increases the excitation current of generator.

F.Alternator loses the residual magnetism and cannot generate electricity when starting.

1.The reason why the residual magnetism is often lost after shutdown is that the material used for the magnetic pole of the exciter is close to the soft steel, and the residual magnetism is less. When there is no current in the excitation winding after shutdown, the magnetic field will disappear. Batteries should be provided and magnetized before power generation.

2.When the magnetic pole of the generator loses magnetism, the DC current larger than the rated current (for a short time) should be introduced into the winding for magnetization, that is, sufficient remanence can be recovered.

G.The temperature of excitation reactor of automatic excitation device is too high.

1.If the reactor coil is short circuited locally, the reactor should be repaired.

2.The air gap of reactor magnetic circuit is too large, so the air gap of magnetic circuit should be adjusted.

H.After generator is started, the voltage cannot rise.

1.The excitation circuit is disconnected, so that the voltage can not rise. Check whether the excitation circuit is broken and whether the contact is good.

2.If there is no instruction on the exciter voltmeter that the residual magnetism disappears, the exciter should be magnetized.

3.The polarity of the magnetic field coil of the exciter is reversed, and its positive and negative connecting lines should be exchanged.

4.When doing some tests in the maintenance of the generator, the magnetic field coil is wrongly connected with reverse direct current, which leads to the disappearance or reversal of the residual magnetism, so the magnetization should be conducted again.

Starlight Power is not only provide technical support, but also sell and produce diesel generators, we have focused on high quality product for more than 44 years. If you need to buy diesel generator recently, please call us +86 13481024441( same as WeChat number). 

High quality diesel generator 50KW

Recently, Starlight signed a contract of 2 sets of 50KW diesel generator set with Beijing Gu Hong Technology Co., Ltd.

Beijing Gu Hong Technology Co., Ltd. Was set up in 2005. 50KW silent diesel genset purchased the customer is equipped with SDEC( Shangchai) H series diesel engine. The engine is a world-class power platform built by Shangchai company according to the characteristics of market demand at home and abroad, referring to the mature technology of international advanced engine, jointly designed with Ricardo of UK, using CPDP development process and SAIC MOTOR manufacturing standard. This series of engines have the characteristics of compact structure, wide range of power, high reliability, good economy and low vibration and noise. In addition, the generator set is equipped a silent rain proof canopy cabinet, which can be directly outdoor used, and ensure that the generator set is free from the influence of wind, rain, dust and mosquitoes. More importantly, the noise level can be reached to 65dB at 7 meters.

Shangchai H series diesel engine technical specification (SDEC SC4H95D2)1.The engine performance is as per GB/T2820.2.Ratings are based on GB/T1147.1.3.Prime power is available for an unlimited number of hours per year in a variable load application. The permissible average power output over 24 hours of operation shall not exceed 80% of the prime power rating.4.Standby power is available in the event of a utility power outage or under test conditions for up to 200 hours of operation per year.5.The permissible average power output over 24 hours of operation shall not exceed 80% of the standby power rating.

Engine model SC4H95D2

Prime Power 62KW

Standby power 68KW

Speed 50Hz

Frequency 1500rpm

Engine Type: In-line,4 strokes, water-cooled, 4 valves, Turbo charged

Combustion type: Direct injection

Cylinder Type: Dry liner

Number of cylinders:4

Bore × stroke: 105x124mm

Displacement: 4.3L

Compression ratio: 17.3:1

Firing order:1-3-4-2

Injection timing: 13.5°BTDC

Rotation: Counter clockwise viewed from Flywheel

Fly wheel housing: SAE NO.3

Fly wheel:SAE NO.11.5

Fuel system

Injection pump: Beiyou in-line “AD” type

Governor: Electric type

Feed pump: Mechanical type

Injection nozzle: Multi hole type

Opening pressure: 250 kg/cm2

Used fuel: Diesel fuel oil
Lubrication system

Lub. Method: Fully forced pressure feed type

Oil pump: Gear type driven by crankshaft

Oil filter: Full flow, cartridge type

Oil pan capacity: High level 13 liters. Low level 11 liters
Cooling system

Cooling method: Fresh water forced circulation

Water capacity(engine only): 6.8L

Water pump Capacity: 117L

Thermostat: Wax–pellet type

Opening temp. 82°C

Full open temp. 95°C

Cooling fan: Blower type, plastic 550 mm diameter, 9 blades

Electrical system

Charging generator: 24V×55A

Voltage regulator: Built-in type IC regulator

Starting motor: 24V×4.5kW

Battery Voltage :24V

Battery Capacity : 120 AH

Engineering data

Water flow: 117 liters/min @1500 rpm

Heat rejection to coolant: 11.7 kcal/sec @1500 rpm

Air flow: 5 m3/min @1500 rpm

Exhaust gas flow: 11.5 m3/min @1500 rpm

Exhaust gas temp.: 600 °C @1500 rpmMax. permissible altitude: 2000m
SDEC diesel generator can be 50kw to 1800kw, if you have purchasing plan, welcome to contact us by email sales@dieselgeneratortech.com, we will work with you at any time.

2500kva diesel electric generator set

Today Starlight Power shares the structure and design of 2000KW diesel generator set, which also supplied by Starlight Power.

1.The generator set can start and operate with load quickly. In the case of unattended operation, the unit can start automatically within 10 seconds after receiving the start command. Under normal site condition, the success rate of one-time self starting of the unit shall not be less than 99%.

2.The start-up battery can restart after failure starting 5s, and can provide six consecutive starts without affecting the use of the start-up battery in the future. The starting battery has redundant starting system.

Provide two sets of battery device: one is static charging device after long-term shutdown of the unit(automatic battery charger); another is charger device during unit running(maintenance free battery). When battery charger has fault, The genset control unit can send out alarm signal.

3.Automatic start-up device can send out self-start command after mains power failure, self starting time can be customized. Diesel generator set has the function of continuous three times self starting. After continuous three times failure starting, will send out failure start signal, and turn off self starting circuit.

2000KW GENSET WITH YUCHAI ENGINE ENGGA ALTERNATOR

4.The average overhaul period of the unit shall not be less than 15000 hours.

5.The fuel injection mode of diesel engine is electronically controlled high pressure common rail, emission standard is Tier 3.

6.The alternator of generator set is equipped with digital automatic voltage regulation(AVR), to ensure the steady-state and transient voltage and frequency adjustment accuracy of diesel generator set in operation to meet the requirements.

7.When three-phase short circuit occurs at the outlet of the generator, it will last for 10 seconds but without harmful deformation of winding, iron core and other accessory parts; when the diesel engine is subjected to 1.2 times of overspeed operation, no harmful deformation will occur; the short-circuit bearing capacity of the unit shall not be less than 300% of the rated current of the unit, and the maintenance time shall not be less than 10 seconds.

8.Protective item of diesel generator set

(1)Overspeed protection: sound and light alarm, stop and close throttle;

(2)Low lube oil pressure: sound and light alarm, stop and close throttle;

(3)Self-starting failure： sound and light alarm;

(4)Low voltage blocking over current protection: sound and light alarm, stop and close throttle;

(5)Alternator over speed protection: sound and light alarm;

(6)Alternator differential protection: sound and light alarm, shut down and close throttle;

(7)High coolant water temperature: sound and light alarm, shut down and close throttle;

(8)Low fuel level of daily fuel tank: sound and light alarm;

(9)Generator trip: sound and light alarm;

(10)Reverse power protection: sound and light alarm, shut down and close throttle;

(11)Loss of excitation protection: sound and light alarm, shut down and close throttle;

(12) Overvoltage protection: sound and light alarm, shut down and close throttle;

(13)Low cooling water level: sound and light alarm;

(14)Overcurrent protection: the protection device is installed on the neutral point of the generator, which acts on the generator outlet circuit breaker tripping and de excitation; the protection device wiring is three-phase three relay type, and the over-current protection has two functions: quick break (main protection) and fixed time limit (backup protection);

(15)Generator differential protection: protection action, generator outlet circuit breaker trip and de excitation; the protection device wiring is three-phase three relay connection;

(16)Single phase grounding protection: the protection acts on the generator outlet circuit breaker trip;

(17)Generator excitation system equipped with automatic voltage regulator fault protection;

(18)Generator excitation system equipped with automatic voltage regulator fault protection;

(19)Diesel engine protection: the diesel engine is equipped with high water temperature, low oil pressure, overspeed protection, protection action at shutdown; installation of high water temperature, low oil pressure, high temperature of lubricating oil, low oil level of diesel oil tank, low water level protection, protection action on signal.

9.Fuel oil and lube oil of diesel engine

(1)Fuel oil brand: National 0# diesel oil.

(2)Lube oil: CH level, 15W30 or 15W40 or above.

(3)The calibration of engine capacity in diesel generator set: altitude 2000m, ambient temperature -10 to 40 ℃, relative humidity 85%. Under this condition, the unit can start normally without adding auxiliary equipment, and there will be no power drop.

(4)Grounding and safety: the base is equipped with devices convenient for connecting with ground wire, and the unit and frame are reliably grounded. When the ambient temperature is 15-35℃ and the relative humidity is 45%-75%, the cold insulation resistance of the unit is not less than 2mΩ; when the ambient temperature is 25℃ and the relative humidity is 95%, the cold insulation resistance of the unit is not less than 0.4mΩ; the hot insulation resistance is not less than 100m Ω. The unit adopts anti-interference measures to avoid misoperation caused by radio wave interference.

(5)Diesel generator is equipped with manual and automatic emergency stop device. With function of manual start/stop and auto start/stop, and emergency stop button. There is manual/automatic switch on the controller cabinet, to reach auto(remote), manual(on site)  start/stop.

(6)Appearance of diesel generator

The welding of the genset is firm, and the welding seam is even without crack.

The surface of the control panel of the unit is smooth, the wiring is reasonable, the contact is good, the hierarchy is clear, and the appearance is neat.

The paint film of the painting part of the unit is uniform, without obvious cracks, shedding, flow marks, bubbles, scratches and other phenomena.

The plating layer of the electroplated parts of the unit is smooth, and there is no leakage spot and corrosion.

Starlight Power has focused on high quality diesel generators for more than 45 years, all product has passed CE and ISO certificate, covering Cummins, Volvo, Perkins, Yuchai, Shangchai, Deutz, Weichai, Doosan, Wuxi, Ricardo etc. Power range is from 25kva to 3125kva. If you have purchasing plan, welcome to contact our sales person by email sales@dieselgeneratortech.com.  

Electric generator set tripping

Tripping phenomenon

A.If diesel genset operates under rated conditions for a few minutes, the automatic air switch trips, after recloses, then trips a few minutes later with a burning odor.

The cause:

The main contact of the automatic air switch is not well contacted or the spring pressure is insufficient. and the lead-out wire of the switch is not well contacted. The above two reasons will increase the contact resistance of the main circuit of the automatic air switch and cause serious fever, which will lead to the action of the thermal release and lead to wrong tripping.

Methods of resolution:

At this time, we should clean the main contacts of the automatic air switch and flatten them with a fine file or fine sandpaper; Adjust contact spring pressure to make good contact; clean contacts, apply conductive paste if necessary, and lock connection screw.

B.Diesel generator trips immediately after connecting load.

After the unit starts, the generator terminal voltage is normal, but when the external circuit is connected, the load automatic air switch will trip immediately.

The causes:

External circuit short circuit and too heavy load.

Methods of resolution:

Find out the short circuit point of the external circuit and repair it. Reduce load to reduce load current output of generators.

But when we do not know what is causes of genset tip, what should do? After power generator set tripping, first check genset to judge the cause of this trip, and then take appropriate measures, the specific steps are as follows:

1.Check whether there is a problem of wrong operation, and whether the secondary circuit will cause tripping;

2.When the main circuit breaker at the outlet of transformer set of generator trips automatically, first check whether the generator indicator has any obvious fault symbols, if have, should cut off the excitation immediately; if not abnormal symbol, under the situation of good furnace condition, the electrical attendant should adjust the generator voltage and frequency in the normal range, check whether the high-voltage auxiliary power with the generator set trips, whether the start-up transformer is put into linkage, and whether the auxiliary power is normal;

3.According to accident phenomena, to judge the nature and scope of the fault, and clearly inspect the external of transformer set of generator and related equipment, to identify whether there are external fault characteristics;

4.Need to pay attentions, If switch tripping occurs in incomplete phase, need to remove start of switch protection failure; if it is not failure protection problem, it is necessary to open all switches connected to the same bus in time;

5.If because of busbar differential protection operation, or generator is over-current protection and other over-step tripping due to faults in substations, check the generator’s external, it is normal, after fault isolation, the connection network is adjusted and connected to the grid;

6.Before tripping, if there is forced excitation and current shock. Reflecting the main protection (differential, heavy mashgas, etc.) action of the internal faults of generator-transformer unit, while the power grid is running normally, should shut down at this time;

7.And that’s another one that will quickly shut down a generator: alternator or prime mover over-temperature, as heat causes lubrication to break down and bearings to swell, increasing friction, causing more heat, and potential total failure or more fire;

8.If there is no strong excitation action and no impulse current before tripping, the operation of power grid is also normal. The generator’s hydro-oil system and main transformer are also normal. The following treatment should be done: check the generator and its circuit, check the protection of the action, if all is normal, generator can be boosted at zero. When boosting, if everything is normal, the generator can be connected to the grid, and then continue to find out the reasons. When boosting, the strong excitation and automatic adjustment device shall not be put into operation. The neutral point of the high-voltage side of the generator-transformer unit shall be grounded. If abnormal phenomena are found, the generator-transformer unit shall be stopped immediately for inspection.

If it is found that the tripping is not caused by the failure of diesel generator set, it may be caused by the wrong operation of the relevant personnel. At this time, the demagnetization switch is often still in the closing position. Operators should first manually trip the demagnetization switch and immediately re-connect generator set to the grid.Starlight diesel generator set covers Cummins, Perkins, Volvo, Yuchai, Shangchai, Ricardo, MTU, Weichai etc. If you have purchase plan recently, please feel free to contact us by email sales@dieselgeneratortech.com.

We Won the Tender of Diesel Generator set 1300KW

Recently, Starlight Power received the notice of winning the bid for 1300KW Yuchai diesel generator set. This generator set is used for real estate project, and Starlight Power will start the loitering work in time within the specified time.

Starlight Power is authorized as OEM supplier of Yuchai engine for diesel generator set with long term stable friendly and cooperative relations. Starlight Yuchai series diesel generator set is with good quality and low price, win a good reputation among users.

Feature of 1300KW diesel generator set powered by Yuchai engine YC12VC2270-D31

1.YC12VC series engine is a classic product independently developed by Yuchai. It has the advantages of energy saving and environmental protection, excellent performance, compact structure, reliability and durability. The emission of pollutants, power, economy and reliability index have reached the international advanced level.

2.It adopts electronic control unit pump, four valves, high-efficiency supercharging and intercooling, Yuchai combustion chamber technology, low fuel consumption, less emissions, excellent speed regulation performance, fast and powerful loading.

3.The machine body is made of high strength material, arc stiffener grid structure, four bolt main bearing structure, high rigidity, low vibration and low noise.

4.The crankshaft is made of high-quality alloy steel all fiber extrusion forging, shaft diameter and fillet quenching heat treatment, anti-wear and long service life.

5.Adopt the world-class equipment and production technology, stable and reliable quality.

6.One cylinder and one cover structure, maintenance window is opened on the side of the machine body, which is convenient for maintenance.

7.Meet the G3 level requirements of generator set performance.

8.Emission standard meet GB 20891-2014 Stage III.

Mains technical datasheet of Yuchai engine model YC12VC2270-D31

Type: Vertical, V-type, water-cooled, four stroke

Air intake mode: Turbocharged & Intercooled

Cylinder number: 12 cylinder

Bore x Stroke: 200x210mm

Prime power: 1520KW

Standby power: 1670KW

Fuel consumption: 195g/kW.h

Engine oil capacity: 340L

Coolant capacity: 300L

Max. water radiator temp.: 102℃

Engine fuel oil rate: ≤ 0.3%

Start mode: Electric start

Governor type: Electric speed control

Start motor: 24V

Start motor power: 11KW

Water pump driving mode: Gear drive

Fuel system: Electric unit pump (direct injection)

This 1300KW diesel generator is equipped with Starlight Power brand alternator TFW2-1300-4A. The alternator is produced by Starlight Power, copper is 100%, brushless and self-exciting, with AVR.

Of course, Starlight Power also have other alternator brands, such as Stamford, Leroy Somer, ENGGA, Marathon, Siemens, Shanghai kepu, Shanghai Stamford etc. Starlight Power is the OEM supplier of these alternators.

Yuchai diesel generator set power range is from 20kw to 2500kw(50Hz/60Hz), other series electric generator: Cummins, Volvo, Perkins, Shangchai, Deutz, Weichai, Doosan, MTU, Tongchai etc. Starlight Power only produces good quality and real product, not produces fake product. All of our product has quality warranty. If you need to purchase, welcome to contact us by email sales@dieselgeneratortech.com.

Representative Projects of Yuchai YC12VC Series Diesel Generators

Today Starlight Power shares Yuchai series engine for diesel generator set, hope this is helpful to you.

YC12VC series Yuchai diesel engine brief introduction:

YC12VC series engine developed independently by Yuchai, is a classic product. It is characterized by energy-saving and environment-friendly, excellent performance, compact structure, and reliability and durability; the indexes, such as pollutant emission, dynamic performance, economy, and reliability, reach the international advanced level.

Yuchai diesel generator set

What is the characteristics of YC12VC series generator set?

1.Electronic unit pump, four-vale structure, high-efficient turbocharged intercooled, and Yuchai combustor technologies are adopted for realizing low fuel consumption, less emission, outstanding speed governing performance, and fast and high-quality loading;

2.High-strength material, reinforced gird structure with cambered surface, 4-bolt main bearing structure, are adopted for the engine body; thus the engine body is characterized by high stiffness, slight vibration, and low noise;

3.The crankshaft is made of high-quality alloy steel by using all fiber extrusion forging process, and the journal and cirular bead are subject to quenching heat treatment for improving wear resistance and prolonging service life;

4.The world-class equipment and technologies are used for production; thus, the quality of such model is stable and reliable;

5.The structure of one head for one cylinder is adopted; maintenance window is set at the side of the engine body, which ensures easy maintenance;

6.Requirement for Grade G3 generator unit performance is satisfied.

Base on the advantages of Yuchai diesel engine: wide range of power, high cost-effective, low fuel consumption, sustained durability, reliable, good adaptability on highland and low noise etc. Starlight customers are prefer to choose Yuchai diesel generator set. Feedback from customers about generating set is very good all the time, especially on low fuel consumption, sustained durability and good adaptability on highland.

Some representative projects of Yuchai YC12VC series diesel generators:

1.The 3×1600kW fully-automated parallel generating set with YC12VC2510-D31 engine has serviced the data center of Guangxi Public Security Bureau since March 2016 and has been working properly.

2.The 3 ×1800kW genest with YC12VC2700-D31 used in Shenzhen Chaozhou Telecom Hub Center, the generator formally passed the acceptance in November 2016 and was put into operation.

3.The 1500kW generators with YC12VC engine in line with T3 emission requirements was used in the project of GUODIAN Nanjing Automation Co., LTD in Nima County, Tibet (5000 meters above sea level), and has passed the acceptance in December 2016. The unit has successfully completed the grid connection test carrying 1000kW load.

4.The 1000-1600kW generating unit with YC12VC engine has been applied in the large hospitals in Xinjiang, Sichuan, Shanxi, Jiangxi, China etc., and more than 10 sets are retained in the medical system.

Yuchai group uses no precise casting molding technology, produces high-quality cylinder block and cylinder head castings with thin wall, light weight, high strength excellent performance etc., it laid a solid foundation for Yuchai to produce the world-class stage six engine. The service areas are all over the world, having more than 700 marine power service station in domestic, provides professional and high-effect service for customers. Besides, there are 14 offices, 169 agents and 460 service station in Asia, USA, Africa and Europe.

Since 2015, Starlight has established a good partnership and became (OEM) supporting factories and technology with Yuchai group. Starlight will provide the best service and generators to customers all the time.

Starlight Power Yuchai diesel generator set power range is from 20kw to 2500kw, if you are interested, please contact us by email sales@dieselgeneratortech.com, or call us +8613481024441(same as WeChat).

300KW/375KVA Diesel Generator Set

On June, 2020, Mr.Nour Fawaz from UAE contacted us by email for inquiry 300KW diesel generator, this is a tender in Ethiopia. They participated in the bidding on behalf of us. Although this is the first cooperation with Mr.Nour Fawaz and his team, and the opening time is a little long, but we are informed that we won the bid on october, 2020. This is the result of our joint efforts and cooperation with our customers. Thanks for your cooperation, Mr.Nour Fawaz and your team.

This 300KW diesel generator set is used for a project in Ethiopia, Starlight Power company finished production in only 15 days. After everything qualified, we delivered to the purchaser in Ethiopia. 

 Starlight 300KW Cummins Silent Diesel Generator Exported to Ethiopia

1.Main technical specifications of 300KW silent genset

Manufacturer: Jiangsu Starlight Electricity Equipments Co.,Ltd

Output power: 300kw/375kva

Frequency/speed: 50Hz/1500rpm

Voltage: 230/400V

Power factor: 0.8lag

Diesel engine: CCEC NTA855-G2A

Alternator: Shanghai Kepu TFW2-300

Controller: SmartGen HGM6110N

Noise level at 7 meters: 75dBA

Dimensions: 4000x1600x1900mm

Weight: 3800kg

2.Technical datasheet of CCEC Cummins engine NTA855-G2A

Manufacturer: Chongqing Cummins Engine Co.,Ltd

Engine model: NTA855-G2A

Prime/standby power: 312KW/343KW

Air intake type: Turbocharged & Aftercooled

Cyliner number/Arrangement: 6 cyliner, Inline, 4 stroke

Displacement: 14L

Bore and Stroke: 140X152mm

Compression Ratio: 14.0:1

Governor Type: Electronic speed regulation

Start mode: 24V DC battery

Fuel system: Cummins PT direct injection

Fuel consumption(rated prime load):

100%:71.9L/h

75%:54.9L/h

50%: 38.9L/h

Oil Capacity: 38L

Coolant Capacity: 28L

3.Technical Specifications of Shanghai Kepu alternator TFW2-300

Manufacturer: Shanghai Kepu Generator Equipment Co.,Ltd

Alternator model: TFW2-300

Type: AC Synchronous generator, brushless, self-exciting

Overload: 10% overload can run 1 hour within 12 hours

Protection Level: IP22

Insulation Class: H

Temperature Rise: H

Voltage Regulation: automatic voltage regulation(AVR)

Number of phase and Access Act: 3 phase 4 wire

Alternator Efficiency: 95%

Bearing: Single bearing

Air Cooling Flow: 2.69m3/s

It conforms to the international IEC standards and the national GB/T 15548-95(General specification for three-phase synchronous generator driven by reciprocating internal combustion).

4.Technical specifications of SmartGen HGM6110N

Manufacturer: SmartGen(Zhengzhou) Technology Co.,Ltd.

Controller model: HGM6110N

1.Automatic controller, integrating digital, intelligent and network techniques, is used for automatic control and monitoring system of genset.

2.It can carry out functions of automatic start/stop, data measurement, alarm protection and three remote(remote control, remote measure and remote communication).

3.LCD display, optional display interface including Chinese, English, Spanish, Russian,Portuguese, Turkish, Polish and French with easy and reliable operation.

4.Circuit breaker for protection. Protection warming, shutdown alarms etc., including emergency stop, low oil pressure, overspeed, failure to start, high water temperature etc.

Every customer has different demand, we can make the diesel generator according to customers’ technical requirements.

Our Cummins generators cover power 25kva to 1875kva, can make as open type, soundproof type, container type( standard size/ non standard size), trailer mobile type. Since 1974, our generator set has been used for many fields, such as hospital, data center, factory, real estate, construction site, mine, plateau, desert etc., solved the electricity problem in many places.

Now our diesel generators are for sale, welcome to send us inquiry if you are interested. Please contact our sales person email: sales@dieselgeneratortech.com. We will work with you at any time.