What is the correct shutdown method for 300 kW generator set?

There are two steps to turn off a diesel generator:

1. Turn the start key to the initial position, and the unit stops.

2. Press the emergency stop button when the generator set cannot be turned off with the key or in an emergency. (The emergency stop button is located above the outside of the mute box, a red button).

Diesel generator set is a kind of power equipment that uses diesel engine as the prime mover and drags synchronous generator to generate electricity. It is a power generation device with fast starting, convenient operation and maintenance, low investment and strong adaptability to the environment.

1. When stopping, remember to turn off the output of the diesel generator, that is, the circuit breaker.

2. When shutting down, pay attention to check whether the diesel generator has the phenomenon of "three leaks", which refers to the oil, fuel and coolant of the diesel generator.

3. Remember to close the fuel valve of the diesel generator when it is stopped.

4. Remember to turn off the air intake and exhaust facilities in the diesel generator room when shutting down, and pay attention to whether the exhaust pipe mouth is covered.

5. After the shutdown, remember to turn off the power key switch of the diesel generator control screen, and take out the key for safekeeping.

6. For diesel generators that need to be shut down or maintained for a long time, the negative cable of the diesel generator starting battery must be disassembled after shutdown, and if the ambient temperature is too low, the fuel and coolant must be drained to prevent freezing.

Summary. If the motor insulation is qualified, it may be that the power supply has a lack of phase, the power supply voltage is unbalanced (too much difference), the motor or motor line is broken, and the contact is poor, which needs to be investigated and solved one by one.

If the motor insulation is qualified, it may be that the power supply has a phase loss, the power supply voltage is unbalanced (the difference in resistance is too large), the motor or motor line is disconnected, and the contact is poor, which needs to be solved one by one.

The reasons why the motor trips when it is turned on: 1. The capacity of the protection switch is too small. 2. The motor is short-circuited.

3. The motor is overloaded or stuck. The motor starts to trip The following inspections are carried out firstly to check whether the motor insulation is normal, and check the motor winding with a 500V shake meter (megohmmeter), and the megaohm and above are qualified; There is no problem with the motor, less than the megaohm is greater than the megaohm, the insulation is unqualified, but it is not leakage; Less than a megaohm is not zero, the motor has been short-circuited or leakage, and it is necessary to continue to check to find the cause; A zero insulation indicates that the motor has been grounded or short-circuited, and it needs to be checked to find the cause. If there is no shake meter, connect a live wire into the motor coil, measure the shell with an electric pen, and the live wire is as bright as the motor has been grounded or short-circuited, and you need to continue to check and find the original Luxiang cause; Use a pen to measure the dismantling of the shell, although there is no fire line brightness, but there is obvious brightness, indicating that the motor has leakage, the insulation is unqualified, and it is necessary to continue to check to find the reason; Measure the shell with a pen, and it is not bright or only faintly bright, indicating that there is no problem with the insulation of the motor.

If the motor insulation is qualified, it may be that the power supply has a lack of phase, the power supply voltage is unbalanced (too much difference), the motor or motor line is broken, and the contact is poor, which needs to be investigated and solved one by one. Check whether the motor is leaking, in the case of no instrument, the simplest thing is that the motor is insulated from the earth, and then the winding is connected to a live wire, and the electric pen is used to test whether the chassis has voltage, and if there is, leakage. The turn-to-turn short circuit will not trip the leakage switch, but will only cause a three-phase current imbalance.

A phase-to-phase short circuit will cause the leakage switch to trip, I hope it can help you.

Generator set shutdown can be divided into several types, let's take a closer look:

1. Normal shutdown.

The switch must be opened before the shutdown, and the unloading unit needs to be shut down after 3-5 minutes of operation under normal circumstances;

2. Emergency shutdown.

a. When there is an abnormal situation in the operation of the generator set, it must be stopped immediately;

b. During emergency shutdown, press the emergency stop button or quickly push the fuel injection pump shutdown control handle to the parking position;

In addition, there are several ways to shut down a 50 kW diesel generator according to the situation:

Sliding parameter shutdown is a shutdown method taken for the maintenance of the unit, to reduce the metal temperature of each equipment of the unit as much as possible, so as to overhaul as soon as possible and shorten the maintenance time. The so-called sliding parameter shutdown is to keep the steam turbine fully open or at a fixed opening, and change the load by cooling and depressurizing the boiler, and finally reduce the load by less than 10%, and stop the brake. In the process of cooling and depressurizing, first cool down and then depressurize, that is to say, first keep a certain pressure, slowly reduce the temperature, and then reduce the pressure.

Rated parameter shutdown is a shutdown method taken for long-term shutdown and does not require maintenance. The so-called rated parameter shutdown is that the boiler maintains a certain steam temperature and pressure, and reduces the load through the opening of the steam valve minor adjustment, and when the load drops to a certain level, open the bypass door and continue to close the adjustment door until the brake is stopped.

Sliding pressure operation refers to an operation mode that keeps the steam turbine fully open or at a certain opening, and changes the main steam pressure by changing the amount of fuel, water volume, air volume, etc. through the main control of the boiler, so as to change the load. Of course, it also depends on the specific control method.