Why should diesel generators be tested

Reasons for diesel generators to be tested:

After detecting the AC false load for the maintenance of the diesel generator set, the unbalanced load ability of the diesel generator set can be detected, and the steady-state voltage regulation, steady-state frequency regulation, transient voltage adjustment frequency, voltage recovery time, transient frequency regulation, frequency recovery time, and diesel generator set continue to operate detection.

The primary function of diesel generator set to detect and maintain AC false loads:

1. Query function.

Query the abnormal records of diesel generator sets, and query the detection data of diesel generator sets.

2. Online communication.

The detector can be connected to the upper computer through the RS232 RS485 interface.

3. Intelligent control and data disposal function.

1) Data transfer: After the detection is completed, the collected data can be transferred to the U disk;

3) Data processing software function: data processing software and detector are used together. The detection parameters can be set to analyze and dispose of the electrical parameters, operation forms and abnormal records detected by the detector; Intelligent query, display and print charts.

4) After setting the parameters of the testing equipment, the active detection can be completed.

4. Parallel function.

The same model of products can be paralleled, the equipment is equipped with RS485 digital parallel interface, which is controlled by the host and records the detection process.

5. Shutdown maintenance function.

Diesel generator set detection and maintenance with AC false load on the basis of the ordinary AC false load, load box, added intelligent control system, can be used for phase loss, over- and under-voltage maintenance settings, once the equipment detected parameters exceed the set parameters, the equipment will announce an audible alarm, and actively shut down for maintenance.

Are you referring to a factory test or a routine test that takes a certain amount of time?

If it is a factory, then this is a must, without testing how to know whether the product is qualified, whether it can operate normally in the market, if not, the product reputation and maintenance costs are higher.

If it is in use, then, this is also a must, any product will be used for a certain period of time will have large and small problems, so we must detect in time, timely maintenance, otherwise when the equipment has problems and is not dealt with in time, the equipment will have a big problem in a short time, the result is more than worth the loss, lose this equipment!

Inspection and management of diesel generator sets.

Pre-boot check:

1 Check whether the oil level of the oil scale is between L and H to see if there are any signs of abnormality in the quality of the oil.

2. Check whether the cooling water in the water tank is enough, whether the water valve is open, and whether the cooling water has any abnormal signs.

3 Check the tension of the water pump belt, fan belt, charger belt.

4 Check whether there is any debris between the fan and the cooling sheet of the water tank, and remove it if so.

5. Check whether there is any debris stacked on the unit, and remove it if there is any.

6. Check whether the generator set has oil leakage and water leakage.

7. Check whether the battery connector is loose and oxidized.

8. Look at the unit operating parameter record card to compare whether the various filters and oil have been used beyond the expiration date.

Check after powering on:

1. Pay attention to whether the generator set has abnormal sound, and stop the machine immediately if there is.

2 Check the oil pressure gauge, under normal circumstances, the oil pressure should not be lower than 35psi

3. Check whether the frequency and voltage value of the generator are stable and the working condition of the charger.

4. The above three conditions are normal, and the no-load heat engine will run with load after 10 minutes.

5. Avoid running for a long time under the working condition of more than 80% of the rated load.

6. Listen to the abnormal sound of the diesel engine under the working condition with load, check the oil pressure, water temperature (below 90 degrees Celsius), frequency, voltage, and smoke color.

7. Check whether the generator set has oil leakage, water leakage, air leakage and abnormal vibration of the unit.

8. Check whether there is any abnormality in the temperature of the electric ball shell.

Stoppage. 1. After unloading, the diesel engine will run no-load for 10 minutes and then shut down, so that the electric ball and the lubricating parts of the diesel engine can be fully cooled.

2. Check whether there is oil leakage or water leakage in the unit after shutdown, and if it is necessary to check, let the cooling water cool down 2 hours after shutdown before discharging the cooling water.

The first step of starting operation, as the saying goes, a new start is half the success, doing a good job in the operation of diesel generator sets is also an important step to ensure the normal operation of all equipment, diesel generator sets should do a good job in the following aspects of testing operations before operation, in order to ensure the normal operation of the equipment, let's take a look with Yangzhou Fukangsi.

1. Check whether the lubricating oil level of the diesel generator is normal.

2. Check whether the coolant water volume of the diesel generator is normal.

3. Check whether everything is normal when the diesel generator is preheated in advance.

4. There is no oil leakage and water leakage in the unit, there is no debris in the machine, and there is no debris in the exhaust port.

5. The inside and outside of the dashboard are clean, there is no debris, the electrical circuit is normal and there is no alarm on the control panel.

6. Detect that all power switch parts correctly meet the operation requirements, detect whether the "emergency stop" button on the local dashboard of the diesel generator is correct, and detect that the power switch at the entrance and exit of the diesel generator is interrupted.

The above aspects are also the operations that everyone should do before the operation of the diesel generator set, and any one of them is very important, and you can't be careless. In its position, doing a good job in those inspection operations can ensure the normal operation of the equipment, reduce the occurrence of common faults in the work, and make your work more efficient.

The differences between generators and electric motors are as follows:

1. The principle is different. Generators are made based on electromagnetic induction; The electric motor is made according to the principle that an energized conductor moves under force in a magnetic field.

2. Different judgment methods. The right-hand rule is used to judge the direction of current in the generator; The direction of movement of the conductor in the motor is based on the left-hand rule.

3. The purpose of work and the transformation of energy are different. Generators need external work to convert mechanical energy into electrical energy; The motor does external work to convert electrical energy into mechanical energy.

There are two types of generators, "generators" and "alternators", where generators produce direct current and alternators produce alternating current. Generators are the first form of generators useful for industrial applications, electric generators use rotating wire coils and magnetic fields to convert mechanical energy into direct current. Initially, generators were used to generate electricity and used steam as a ** to produce the required mechanical energy.

The use of power generatorsIn addition to a few low-power applications, alternators are more widely used to generate electricity. These types of generators convert mechanical energy into alternative electrical current. A rotating magnet acts as a rotor and rotates inside a set of conductor coils on the core, which becomes the stator.

As the magnetic field rotates, they produce an alternating voltage in the stator. Magnetic fields can be generated by magnets or electromagnets of magnetic field coils.

1. The fuel required is different.

Diesel has a relatively high calorific value, while gasoline burns more smoothly in comparison.

2. The power is different.

In the same way that a diesel-burning car has more horsepower than a gasoline-burning car, the minimum power of a diesel generator set is 8 kilowatts, and the maximum power can reach 2,000 kilowatts, and the maximum power of gasoline of the same volume can only reach 10 kilowatts.

3. Different ignition types.

In the cylinder of a gasoline engine, the mixture of fuel and air is ignited with a spark plug. In a diesel engine, the mixture is ignited with the heat formed by compression.

4. The volume is different.

The gasoline engine is small in size, easy to handle, and suitable for mobile power supply.

5. The mixture of fuel and air is different.

In a gasoline engine, fuel and air are mixed in the carburetor and intake ducts. In a diesel engine, the mixing of fuel and air takes place after the diesel fuel is sucked into the cylinder.

6. The main uses are different.

Diesel engines are mainly used for industrial power supply, and gasoline engines are generally selected for household use.

There are many reasons why diesel generator sets do not generate electricity, and several common reasons are introduced:

1. The diesel generator often loses remanence after shutdown, because the material used for the exciter pole is close to mild steel, the remanence is small, and the magnetic field disappears when there is no current in the excitation winding after shutdown.

2. The excitation circuit component is damaged or the line is open-circuited, short-circuited or grounded.

3. The contact between the exciter brush and the commutator is poor or the pressure of the brush holder is insufficient.

4. The wiring of the excitation winding is wrong, and the polarity is opposite.

5. The contact between the generator brush and the slip ring is poor, or the brush pressure is insufficient.

If the diesel generator set is used as an emergency backup power supply, it will be serious, so the common fault users of the unit must be understood.

Inspection and treatment method of diesel generator starting but not generating electricity:

1. Measure whether there is really electricity, and replace the voltmeter with the generator.

2. Hit it to automatic or manual.

3. Check and correct according to the circuit diagram.

4. New generators or machines that have not been used for a long time can easily appear. You can press the recharge button on the control screen to magnetize, or you can use a 12V battery to magnetize the excitation winding, the positive pole is connected to F1, and the negative pole is connected to F2If the voltage still cannot be established, switch the positive and negative poles of the battery and try again.

5. Clean the surface of the ring, and sanding the end face of the carbon brush to make the arc match area with the surface of the collector ring greater than 70%, so as to strengthen the spring pressure.

6. Clean the carbon brush and hold the carbon brush so that the carbon brush can move freely.

7. Use a multimeter to check the forward and reverse resistance of the diode, and replace it if damaged.

8. Check with a multimeter, and replace it if the forward and reverse resistance does not meet the requirements of the diode.

9. Check the winding with a multimeter 1k file, and if the resistance value is infinite, it should be turned on. Then check with 1 ohm, if the resistance value is zero, replace or dispose of the winding. If it is unstable, check whether the connector wiring is loose.

Generator does not generate power and causes of failure:

1. The control screen indicates that the voltmeter is bad.

2. On the control screen"Auto-manual-demagnetization"The switch is in the demagnetization position (fully automatic genset function).

3. Wrong wiring.

4. There is no remanence or the remanence is too low.

5. Poor contact between the carbon brush and the collector ring or insufficient pressure of the carbon brush spring (three-wave brushed motor).

6. The carbon brush grips rust or the toner is stuck in the carbon brush, so that the carbon brush cannot move up and down (three-wave brush motor).

7. The rectifier on the excitation rectifier plate has an open circuit of two tubes or a short circuit of the freewheeling diode (three-wave brushed motor).

8. The rotary rectifier module is damaged.

9. The generator winding or excitation winding is broken or the contact is poor.

375 kW diesel generator.

What is the reason for not generating electricity after starting.

There are several ways to judge whether a diesel generator is operating normally:

1. Ammeter: Observe whether the needle indication of the ammeter is normal, switch the current switch to measure the phase current value between the phases, and under normal circumstances, the difference between the phases shall not exceed 10%.

2. Voltmeter: Observe whether the voltage value indicated by the voltmeter needle is normal (380V-400V).

3. Charging meter: Observe whether the pointer of the charging meter is split in the direction of (+), if the pointer is biased to the direction of (-), it means that it is not charging.

4. Oil pressure gauge: observe whether the oil pressure indicated by the oil pressure gauge is within the normal range (within the green line).

5. Water temperature meter: observe whether the water temperature meter indicates whether it is in the normal (65 93) range, and the pointer is abnormal when it does not move or is higher than 93.

6. Tachometer: Observe whether the speed of the engine is appropriate, when it is normal, such as the frequency is 50Hz, the speed is 1500r min.

7. Sound and vibration: listen carefully to the sound of operation, under normal circumstances, there should be no abnormal sound and vibration.

Reasons why diesel generators do not generate electricity:

1) The magnetic poles of the generator lose their magnetism.

2. The excitation circuit component is damaged or the line is open-circuited, short-circuited or grounded.

3. The contact between the exciter brush and the commutator is poor or the pressure of the brush holder is insufficient.

4. The wiring of the excitation winding is wrong, and the polarity is opposite.

5. The contact between the generator brush and the slip ring is poor, or the brush pressure is insufficient.

6) The generator stator winding or rotor winding is broken.

7) The generator lead wire wiring is loose or the switch is in poor contact.

8) Fuse blowing.

The diesel generator set cannot be started.

The successful start of the diesel generator must ensure that there is a high enough speed, good cylinder compression, and timely injection of good atomized fuel. In addition, there must be a certain temperature to bring the atomized fuel to a state of ignition.

When it fails to start, check the circuit first. If the start button is pressed and the starting motor does not operate, the circuit is open or the contact is poor. If there is only the sound of the impact between the starting gear and the flywheel ring gear, it means that the big and small gears fail to mesh, and only need to move the flywheel disc one to several teeth.

If the starting motor is weak and the speed is low, the battery power is insufficient.

If the starter motor runs strongly, the speed is normal and does not ignite, the grease nozzle does not bark, and the exhaust pipe is smokeless, it is a fuel system failure. Or although it can be started, it turns off after a few turns, and there is air or moisture in the fuel.

When the starting motor reaches the starting speed, although there is a sound of fuel injection from the nozzle, it is not easy to start, and there is an air leakage sound. After stopping, the flywheel is rotated with a change cone, if it is easy and weak, or the resistance is very small, and the flywheel does not rebound, it indicates that the compression force is insufficient.

If the ambient temperature is too low, or the machine has been stopped for too long, the oil is too thick, the resistance of moving parts is large, the gap between the piston and the cylinder is too large, and the compression force is insufficient, it is difficult to start. At this time, the machine should be preheated with hot water or steam before starting.