The estimation of the capacity of commonly used diesel generator sets is selected according to the long-term continuous operation output power of the unit to meet the maximum calculation load of the whole project. According to the national standard GB1105.1-1987 "Internal combustion engine bench performance test method, standard environmental conditions and power, fuel consumption and oil "Consumption Calibration" stipulates that under standard environment (atmospheric pressure=100kPa, relative temperature=30%, ambient temperature=298K or 25℃, intercooler cooling medium inlet temperature=298K or 25℃.), the diesel engine is allowed to run continuously Calibration power of 15min. When the ambient humidity and altitude are too high, the air density will decrease, and the supply of oxygen required for combustion during unit operation will decrease, and the output power of the unit should be adjusted accordingly. In other words, the power of the selected unit is higher than the absolute value of the load power, that is, when the unit is working under non-standard conditions, the diesel engine should be corrected for power.

The output power of a diesel generator set during continuous operation in a normal environment is generally 0.9 times the rated power. If the unit capacity is selected too small, it will not be able to drive all loads or cause a sudden shutdown when starting high-power loads; if the unit capacity is selected too large, the investment and maintenance costs will be high, resulting in waste of resources. Moreover, according to the characteristics of the diesel engine, when it works under a small load for a long time, it will cause serious carbon deposits on the piston ring, fuel injection nozzle, etc. of the engine, and worsening of cylinder wear and other adverse consequences such as damage to the unit.

During the working process of the diesel generator set, for resistive loads such as light bulbs, electric stoves and ovens and other small and medium household appliances, inductive loads such as machine tools, water pumps and other large electrical equipment, the characteristic of the resistive load is that the resistance remains basically unchanged, but The current decreases proportionally with the voltage, so for electrical equipment with different loads, the capacity of the diesel generator set needs to be recalculated.

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