1. Q: After the operator takes over the diesel generator set, Which of the first three points to verify？
A: 1) Verify the real useful power of the unit. Then determine the economic power, and standby power. The method of verifying the real useful power of the unit is: the 12-hour rated power of the diesel engine is multiplied by 0.9 to obtain a data (kw), if the rated power of the generator is less than or equal to the data, the rated power of the generator is determined as the real useful power of the unit, if the rated power of the generator is greater than the data, the data must be used as the real useful power of the unit; 2) Verify which self-protection functions the unit has; 3) Verify whether the power wiring of the unit is qualified, whether the protection grounding is reliable, and whether the three-phase load is basically balanced.
2. Q: The elevator starting motor is 22KW, and how large the generator set should be equipped?
A: 22*7=154KW (the elevator is a direct load starting model, and the instantaneous starting current is generally 7 times the rated current to ensure that the elevator moves at a constant speed). (That is, at least 154KW generator set should be equipped)
3. Q: How to calculate the optimal use power (economic power) of the generator set？
A: P optimum =3/4*P rating (i.e. 0.75 times rated power).
4. Q: How larger the state stipulates that the engine power of the general generator set than the generator power？
A: 10℅。
5. Q: Some generator engine power is expressed by horsepower, how to convert between horsepower and international units of kilowatts？
A: 1 horsepower =0.735 kW, 1 kW =1.36 HP.
6. Q: How to calculate the current of three-phase generator？
A: I = P / 3 Ucos phi ()), the current = power (watts) / 3 * 400 () (v) * 0.8) Jane calculate formula is: (I) (A) = rated power (KW) * 1.8
7. Q: The relationship between apparent power, active power, rated power, maximum power and economic power？
A: 1) The unit of apparent power is KVA, which is used to express the capacity of transformers and UPS in China; 2) The active power is 0.8 times of the apparent power, the unit is KW, which is used in power generation equipment and electrical equipment in China; 3) The rated power of the diesel generator set refers to the power that can run continuously for 12 hours; 4) The maximum power is 1.1 times the rated power, but only 1 hour is allowed within 12 hours; 5) The economic power is 0.75 times of the rated power, which is the output power of the diesel generator set that can run for a long time without time restrictions. When running at this power, the fuel is the most saved and the failure rate is the lowest.
8. Q: Why not allow diesel generators to operate for a long time at less than 50% of rated power?
A: Increased oil consumption, diesel engine is easy to carbon, increase the failure rate, shorten the overhaul cycle。
9. Q: The actual output power of the generator during operation depends on the power meter or the ammeter？
A: The ammeter is used for reference only.
Post time: Jun-11-2024