What are the precautions for starting 300kw diesel generator?

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What are the precautions for starting a 300kw diesel generator? Note that these uses help to extend the life of the unit and reduce unit failures.

1. The continuous working time of the diesel generator should not exceed 10s each start, and the interval between the two starts should be more than 2min to prevent the armature coil from overheating and burning out. If the start is not successful after three times, the cause should be found out before starting.

2. When you hear that the driving gear rotates at high speed and cannot mesh with the ring gear, you should quickly release the start button, and then start it for the second time after the starter stops working, so as to prevent the drive gear and the flywheel ring gear from hitting each other and being damaged.

3. When using diesel generator sets for power supply in cold areas, antifreeze engine oil should be changed; When starting, a "one" long-handled screwdriver should also be used to pull the flywheel ring gear at the flywheel inspection hole for a few weeks before starting.

4. After the unit starts, the start button should be released quickly to make the drive gear return to its original position.

5. It is strictly forbidden to press the diesel engine start button again during normal work.

6. Lubricating grease should be added to the bushing before and after the starter regularly to prevent dry friction from damaging the shaft and bushing.

The start and shutdown of diesel generator sets are divided into two forms, one is manual test operation, and the other is automatic switching control.

1. Manual test machine.

Diesel generator set manual start: After testing the alarm system normally, the control switch is set to the manual (man) position, and the diesel generator set can start by itself.

When the diesel generator set is stopped, the generator can be stopped by controlling the switch to the stop position or pressing the red emergency stop button, and the emergency stop button can be forced to stop when the red emergency stop button is pressed, otherwise the generator will not start.

2. Automatic switching control.

When the mains power stops, the ATS will give the start signal to the generator control system, and the generator will start automatically.

When the control switch stops to stop or remains automatic, but the mains power has been restored, the ATS will send a stop signal, and the diesel generator set will eliminate the fault and then press down the fault recovery button to prepare for restart.

In fact, the start-up steps of the 300kw diesel generator set are not only the moment of start-up, but also some things to pay attention to before start-up

1. Check before starting:

1. Check whether the premise of the generator set device meets the installation requirements of the unit and whether the installation is firm;

2. Check the inlet and exhaust air situation and confirm that the inlet and exhaust air meet the requirements;

3. Check whether the generator set is wrongly installed and missing, and whether there are three leaks;

4. Check the installation of each auxiliary part of the unit, such as silencer, load cable, grounding cable, charger, inlet and return oil circuit and battery, etc., and check whether the load cable and grounding wire of the transfer switch are installed and checked if the unit is equipped with a transfer switch.

2. Preparation before start-up:

1. Check whether the coolant, lubricating oil and diesel fuel of the unit are complete;

2. Review whether the battery electrolyte is sufficient and whether the battery voltage is deformed;

3. Check whether there are tools or other sundries on the unit;

4. Check whether the rolling part of the unit is normal and whether the connection is tight.

3. Start-up and debugging:

1. After checking and confirming the realization before starting, connect the battery cable, pay attention to the positive and negative extremes and cannot be reversed or short-circuited;

2. Turn on the power supply of the battery charger and confirm that the charger is working normally (if configured);

Fourth, the unit start-up operation:

1. Start the generator set and check whether there is abnormal noise, three leaks and other abnormal conditions;

2. After the generator set starts successfully, carry out no-load operation, low-power generator set, check whether the voltage, frequency, battery voltage, engine temperature and oil pressure and other parameters are normal, whether the unit operation is normal and stable, and check whether the phase sequence of the unit is consistent with the phase sequence of the power grid; Run no-load for 1 minute, and test each alarm item (such as low oil pressure, high water pressure, overspeed, etc.);

3. Slowly increase the throttle, when the voltage reaches 400V and the frequency is 50Hz, fix the throttle, close the closing switch at the generator end, and the generator will supply power.

1. Before the generator set starts:

Check the amount of fuel.

Check the lubricating oil (oil) system The oil tank oil level should be between l h of the oil level scale.

Check the cooling system The water level of the water tank should be full of the overflow port of the tank cover, and there is no water leakage at the joints of the pipeline.

Check the starting battery voltage 22 26VThe liquid level should be 10 15mm higher than the plate

Check the tension of the transmission belt and press 10 to 15mm in the middle of the belt by hand.

Check the generator load switch The switch should be in the "off" position.

2. Start sequence:

Turn on the power switch to the "on" position.

Turn the run selector switch to the "auto" or manual position.

After the generator is started, attention should be paid to observe whether there is water leakage, oil leakage, abnormal sound, different color and other abnormal phenomena.

If the generator needs to be loaded, wait for the generator to start no-load operation for 3 5 min, and then close the load switch.

3. Pay attention to the parameters displayed on the control screen during operation.

During operation, the control screen displays the reference values of the normal range of parameters.

Voltage: 380V 410V Current: <685A Frequency: 48 52Hz

Oil Pressure: 50 70psi Water Temperature: <100 Speed: 1500r min

Starting motor voltage: 24V, oil temperature< 130

4. Shutdown sequence:

First, turn the load switch to the "off" position.

After the generator runs no-load for 3 5min, turn the operation selector switch to the "O" position, and the generator will stop immediately.

Do a good job of filing various operation records.

Observe whether the fuel is sufficient and do a good job in the machine room for 5s

5. Precautions:

Check the oil level before the generator runs or after 15min of shutdown, and the oil level scale must be pumped first.

Wipe dry with a dry cloth and reinsert the ruler into place again, whichever is the level shown in this pump.

The continuous start time of the generator shall not be greater than 30s, if it cannot be started within 30s, it must wait for 10 20s and then again.

1. Disconnect the diesel engine from the transmission or put the gearbox in neutral position.

2. Put the parking solenoid, electrical switch and mechanical control device in the running position.

3. For diesel engines with full-course governors, put the throttle slightly higher than the idle position (about 700r min), and for cold vehicle diesel engines with two-pole governors, when starting, the accelerator pedal should be pressed to the end and the pedal should be released before the starter motor engaged.

4. In order to prevent damage to the starter motor, the meshing time of the starter motor shall not exceed 30 seconds each time, and the interval between the two consecutive starts shall be 2 minutes.

5. The diesel engine oil pressure gauge must display the reading within 15 seconds after starting.

6. The speed of the diesel engine should be slowly increased when starting cold, so as to ensure that the bearing receives sufficient lubrication and the oil pressure is stable.

7. After idling for 3 5 minutes at 1000r min, the load can be gradually increased. It is strictly forbidden to accelerate the loading and operation of the diesel engine immediately after starting. Note that the idle time of the diesel engine should not be too long, otherwise the diesel engine will be damaged.

Diesel engine starting.

A. Generally in a good standby state, when the security power supply of any section of the electrical 380V accident is lost, it will automatically start in time and quickly replace the load.

b. If the accident security power supply is lost and the diesel motor is not started, after getting the start command of the unit leader, immediately turn the key switch clockwise to the starting test position (test), and the signal is red at the same time, the diesel generator starts and automatically rises to the rated speed, and the voltage is established normally.

The diesel engine starts in 7 to 9 seconds and will automatically rise to the rated speed and rated voltage.

The correct operation method for manual start of diesel generator set is described as follows:

1. When the indoor temperature is lower than 20, turn on the electric heater to preheat the machine.

2. Check whether there are any debris that hinders the operation of the body and its surroundings, and remove it in time if there is any.

3. Check the crankcase oil level, fuel tank oil level, and radiator water level. If the oil level is lower than the specified value, it should be replenished to the normal position.

4. Check whether the fuel supply valve and cooling water shut-off valve are in the open position.

5. Check whether the voltage of the battery pack with the starting electric is normal.

6. Check the test button of the power distribution screen, and observe whether the alarm indicator lights are turned on and bright.

7. Check whether the switches of the distribution panel are placed in the opening position, and whether the indication of each instrument is in the zero position.

8. Start the air inlet and exhaust fan.

9. Press the start button of the engine to start running. If the first start fails, you can press the corresponding reset button on the power distribution screen, and the second start can only be carried out when the alarm is eliminated and the unit returns to normal state. After starting, the machine runs normally, the cooling water pump operation indicator light is on and the road instrument indication is normal, and the start is successful.

The correct start of the 350kw diesel generator set can reduce the failure of the unit, prolong the life of the unit, and ensure the normal operation of the unit.

1. Do a good job of various inspections before starting, including the body, connectors, starting electrical circuits, coolant, and oil pump.

2. If the diesel engine is parked for more than 5 days and has not been used, the crankshaft should be rotated for 3-5 turns before starting.

3. After checking the normal parts and components, you can start the diesel engine. If it does not start within 12 seconds, you should release the button immediately, and then start the second and second times after 2 minutes. If it fails to start three times in a row, stop starting and find out the cause.

4. After starting at low temperature, the increase of speed should be as slow as possible to ensure that the bearing is sufficiently lubricated and the oil pressure is stable.

1. Many factors affect the size of the generator set. Among them, the characteristics of the electrical load of the system are an important factor. Users must carefully consider the following points before choosing a diesel generator set:

a. Is it used as a common generator set, or a standby generator set.

b. The allowable voltage drop of the system.

c. Consider the increased power consumption of the system in the future.

d. The situation of motor starting.

2. Unit power calibration.

The diesel generator set that is generally supplied to the user is a common unit, which can supply power to the load at rated power for 12 hours continuously (including the ability to run at 110% rated power for 1 hour). When mains failures are less frequent and the power supply is not long, the user can use the generator set whose power is calibrated as a standby unit. It should run at an average of 80% maximum power for no more than 200 hours per year, and for an additional 25 hours per year at 100% maximum power.

3. Problems that need to be paid attention to when matching the rental limb of the generator set with the three-phase motor.

The most commonly used type of motor in mechanical engineering is the three-phase AC induction motor. Due to their starting characteristics, these motors are directly connected to the power supply system. If it is started directly, it will generate an inrush current of up to 6 times the rated current of the motor.

After the soft start device is configured, the starting current is very stable and will not cause an impact on the generator set. When the generator set and the three-phase motor capacity are selected, it is recommended to consider the safety factor, that is, the motor capacity of Beisun Xun (it must be a soft start mode).

Before starting the 400kw diesel generator set, the precautions are as follows:

1. Check that the flywheel and part of the generator protective railing cover should be in good condition. (For reference only: (Fujian Yadong with Kuannan diesel generator set: 4000-080-999) Yaxiaonan will answer for you).

2. The operator should have a clear division of labor, implement supervision, and wear insulated shoes.

3. After sending the signal of "ready" to the staff of the electrical room, carefully check the gearbox, clutch, governor crankshaft control, oil level, and fastening screws of each part to confirm that it is correct, and make sure that the oil and water temperature is not lower than 20 before starting.

4. The pipeline gate of each system should be in the working position.

5. The connecting bolts of the transmission and selling mechanism should be tightened well.

6. Check whether the pressure of the gas cylinder is normal and whether the overspeed safety device is positioned.

7. Put the clutch handle in the starting position and open the blowdown valve of the scavenging pump.