Safety operation requirements for diesel generator sets

(1) When installing diesel generator sets, they should be stable and firm. When operating outdoors, a shed should be erected and good ventilation should be maintained.

(2) Oil or other flammable materials should not be placed nearby, and fire-fighting equipment should be installed. In case of fire, the power should be cut off first and immediate firefighting should be carried out.

(3) The connecting parts of the diesel generator set should be firm and reliable, the rotating parts should have protective devices, the output circuit should have good insulation, and the indications of each instrument should be clear.

(4) During operation, operators are not allowed to leave the machinery. If any abnormalities are found, the machine should be stopped immediately, the cause should be identified, and the problem should be resolved before continuing to work.

(5) Live work is strictly prohibited. Before repairing electrical equipment, the power must be cut off, and prominent warning signs must be hung, with dedicated personnel assigned to supervise.

Precautions for diesel generator set operation

For new or long-term unused diesel generator sets, strict inspections must be carried out before they are put into normal operation, mainly checking the insulation and wiring conditions of the windings.

1. During the operation of the diesel generator set, a dedicated person is required to monitor and check the power, voltage, current, water temperature, oil temperature, engine oil pressure, etc. at any time, and carefully fill in the operation records. It is strictly prohibited to leave the post while on duty.

During operation, operators should maintain a safe distance from live equipment and wear labor protection equipment. The switching operation should pay attention to the sequence. If there is a power outage, the branch switches should be disconnected first, then the main switch should be disconnected, and then the position of the four pole double knife switch should be switched. When delivering power, the sequence is reversed. Normal shutdown should first unload some of the load, then turn off the main switch, and finally turn off the diesel engine. It is not allowed to not pull the main switch, and the power should be cut off automatically with the diesel engine stalling. Perform routine checks on the unit after shutdown and record the operating conditions (work diary).

3. In case of electric shock, the power switch should be quickly cut off, or insulated equipment should be used to quickly cut off or disconnect the power supply. Then carry out rescue and invite a doctor to come to the scene for rescue. In case of electrical equipment fire, the relevant power supply should be immediately cut off and reported to the local power supply station, and then firefighting should be carried out. Dry fire extinguishers, carbon dioxide fire extinguishers, etc. should be used to extinguish fires on live equipment, and water is not allowed.

When the power supply bureau loses power, first separate the main incoming switch of the power distribution room and the main circuit breaker switch of the diesel generator set

5. Check the lubricating oil and cooling water, battery power, and add enough diesel.

6. Turn on the battery switch, press the electric start button, and slowly refuel and increase the speed to the rated high speed.

7. Press the start power button and adjust the frequency to 50Hz to output a voltage of 380V

After the unit warms up without load for 5 minutes, connect the main circuit breaker of the diesel generator set to power on

When the power supply bureau calls, the unit shuts down. First, separate the main circuit breaker of the generator, then turn off the throttle, and turn off the main incoming switch in the distribution room.

Technical briefing on safe operation of diesel generator sets

1. Diesel generator sets powered by internal combustion engines should strictly follow the safety instructions for internal combustion engine operation.

2. For newly installed, overhauled, or discontinued generators that have been in use for more than 10 days, the insulation resistance and absorption ratio of the stator and excitation circuit should be measured before use. The insulation resistance of the stator should not be less than 30% of the last measured value, and the insulation resistance of the excitation circuit should not be less than 0.5Mn and the absorption ratio should not be less than 1.3. Measurement records should be kept.

3. Before starting work, check the transmission parts of the internal combustion engine and generator. The connection should be reliable, the insulation of the output circuit wires should be good, and all instruments should be complete and effective.

Before starting, the resistance value of the excitation resistor should be set to the maximum position, and then the power supply output main switch should be cut off, and the neutral point grounding switch should be connected. For units with a clutch, the internal combustion engine should be started to run at no load first, and the generator should be engaged after it is normal.

5. After starting, check that there is no abnormal noise during the speed increase of the generator, and that the contact between the sliding ring and the commutator brush is good, without any jumping or sparks. After the operation is stable and the frequency and voltage reach the rated value, power can be supplied externally. The load should gradually increase and the three phases should remain balanced.

After the generator starts running, it should be considered that all electrical equipment has been charged.

7. If the voltage of the generator is too low, it will have adverse effects on the operation of the load (such as electric equipment), and it will also be detrimental to the operation of the engine itself, and it will also affect the stability of grid connected operation; High voltage not only affects the safe operation of electrical equipment, but also affects the service life of the generator. Therefore, the maximum and minimum allowable voltage values for continuous operation of the generator shall not exceed ± 10% of the rated value. The voltage variation range for normal operation should be within ± 5% of the rated value. If it exceeds this specified value, adjustments should be made. When the power factor is at the rated value, the rated capacity of the generator should remain unchanged.

When the generator set operates at high frequencies, it is easy to damage components and even cause accidents; When the generator operates at a low frequency, it not only has a negative impact on the safety and efficiency of the electrical equipment, but also can reduce the generator speed and increase the temperature of the stator and rotor coils. So when the generator operates at the rated frequency value, its range of variation shall not exceed ± 0.5Hz.

9. The power factor of the generator shall not exceed 0.95 for the delayed phase (lag). If there is an automatic excitation regulation device, it can operate under the condition of a power factor of 1, and if necessary, it can be allowed to operate for a short period of time within a delay range of 0.95-1.

10. During the operation of the generator, it is necessary to regularly check and confirm that all instrument indications and operating parts are normal, and adjust the load of the generator at any time. The current of the stator and rotor shall not exceed the allowable value.

Before shutting down, the main switches of each power supply branch should be cut off first, gradually reducing the load. Then, the main switch of the generator power supply should be cut off, and the excitation resistor should be returned to the maximum resistance position to reduce the voltage to the lowest value. Finally, the excitation switch and neutral point grounding switch should be cut off, and the operation of the internal combustion engine should be stopped.

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