The phenomenon of the diesel generator not producing electricity and its solutions
1. Phenomenon: Bad wiring.
Treatment: Check and correct according to the wiring diagram.
2. Phenomenon: The speed is too low.
Processing: Measure the rotation speed and keep it at the nominal value.
3. Phenomenon: There is mud or oxide on the wiring joint between the stator winding and the generator power distribution equipment, the wiring screws are loose, the connection wire is broken and the stator winding is broken.
Treatment: Use a multimeter or light test method to find out where the disconnection is. Check the connection and contact of each wiring screw.
4. Phenomenon: The excitation circuit is disconnected or has poor contact.
Treatment: Use a multimeter to find out where the broken wire is, resolder the broken wire firmly and wrap itto isolate it.
5. Phenomenon: The rectifier tube (including the rectifier diode and thyristor) is damaged.
Treatment: Replace damaged components.
6. Phenomenon: Poor contact between brush and slip ring or insufficient brush pressure.
Processing: Clean the surface of the slip ring, polish the brush to match the surface of the slip ring, and increase the pressure of the brush.
7. Phenomenon: The brush holder is rusty and the brush cannot slide up and down.
Disposal: Wipe the interior surface of the brush holder with emery cloth. If it is damaged, replace it.
8. Phenomenon: The position of the exciting brush is incorrect, the brush is damaged, or the spring pressure is insufficient.
Treatment: Adjust the brush to the correct position, replace the brush and adjust the spring pressure.
9. Phenomenon: The direction of rotationn of the main motor is incorrect.
Process: change the rotation direction of the main motor.
Detailed information
Principle
The basic structure of a diesel generator is composed of a diesel engine and a diesel generator. the motor drives the production of electricity The machine produces electricity.
The basic structure of a diesel engine: it consists of cylinders, pistons, cylinder heads, intake valves, exhaust valves, piston pins, connecting rods, crankshaft, bearings and flywheels.
The diesel engine of a diesel generator is generally a single-cylinder or multi-cylinder four-stroke diesel engine. The piston makes four strokes during movement: intake stroke, compression stroke, combustion, and power (expansion). stroke and exhaust stroke.
When the piston moves up and down, the inlet valve opens and fresh air filtered throughthe air filter enters the cylinder to complete the intake stroke. The piston moves up and down, the intake and exhaust valves are closed, the air is compressed, the temperature and pressure increase, and the compression process is completed.
When the piston is about to reach the top, the injector sprays the filtered fuel into the combustion chamber in the form of mist, mixing with the air at high temperature and high pressure, and immediately ignites and burns on its own. The high pressure formed pushes the piston down to do the work, pushes the crankshaft to rotate and complete the power stroke.
After the power stroke is completed, the piston moves up and down, the exhaust valve opens to vent, and the exhaust stroke is completed. The crankshaft rotates half a turn each stroke. After several working cycles, the diesel engine gradually acceleratesto operate under flywheel inertia.
BaiduEncyclopedia - Diesel generator
So-called insufficient power is what is usually called a “weak” diesel engine. Under normal circumstances, Cummins diesel generators usually have a certain power reserve and can operate machines normally in working order. When the power is insufficient, it means that the diesel generator cannot move its working machines, accompanied by the following phenomena.
①The diesel generator emits black smoke. At that time, a large amount of black smoke was coming from the exhaust of the diesel generator.
②The exhaust temperature of the diesel generator is high. At this time, the exhaust pipe and turbocharger turbine are dark red.
③The speed of the diesel generator decreases or is unstable, and there is a sound of unable to work.
CA analysisuses
The power index of a diesel generator is a complete reflection of its technical condition. If it is technically in good condition, a diesel generator can produce sufficient electricity. When power is insufficient, it often reflects various system failures. According to the working principle of a diesel generator, the basic conditions for a diesel generator to generate sufficient effective power are:
① Inject a sufficient amount of well-atomized fuel into the cylinder according to a certain rule and at a certain time.
② A sufficient amount of fresh air will enter the cylinder at a certain time according to certain rules, and the burned exhaust gas will be discharged from the cylinder at a certain time according to certain rules.
③The air and fuel are mixed well and burned completely.
④ The friction power and energy consumption of the accessories are small, that is, the mechanical efficiencyique must be high.
Therefore, when analyzing the causes of electricity shortage, we can start from the above basic conditions and analyze the causes according to the system according to the phenomenon of electricity shortage .