Characteristics of various backup power sources
1.Characteristics of UPS power supply
1) Uninterrupted power supply can be realized .
2) Long-term loading work.
3) Loads with motors need to be expanded or slowed to start.
4) There is an ecological damage problem in the disposal of the battery, and it should be treated in an environment-friendly manner.
2. Characteristics of diesel generators
1) Large capacity, loud noise and pollution.
2) There is a large amount of sulfur dioxide in the exhaust smoke, which pollutes the atmosphere and seriously affects the environmental protection.
3) In high-rise buildings, diesel generator sets are generally placed in the basement, which is difficult to design and high cost. Facilities such as air intake, cooling, smoke exhaust, shock absorption, and noise reduction need to be fully considered, and special Room.
4) Routine maintenance must be in place and the workload is heavy.
5) There is a fire hazard. Because there is an oil tank inside, in case of fire, the consequences are unimaginable. The generator room needs to use water spray to extinguish the fire, and the cost is getting higher and higher.
3. Characteristics of emergency power supply (EPS power supply)
1) When there is electricity in the grid, it is static and no noise; The noise is less than 60db. No need for smoke exhaust and shockproof treatment. And it has the characteristics of no fire hazard.
2) Automatic switching, which can realize unattended, energy saving, the mutual switching time between grid power supply and EPS power supply is 0.25S, and zero switching can be achieved under special circumstances.
3) It can directly carry motor loads without adding soft-start equipment.
4) Reliable use, the life of the host is more than 20 years (excluding batteries).
5) Adapt to harsh environments, can be placed in the basement or power distribution room, or even in the building shaft, and can be installed on the spot close to the emergency load use site to reduce power supply lines.
6) There is a problem of ecological damage in the disposal of the battery, and should be treated in an environmentally friendly manner.
The difference between EPS power supply and UPS power supply
1. The difference of load nature
UPS power supply The power supply objects of the UPS are mainly computers and network equipment, and the nature of the load is relatively low. Currently, the power factor of the UPS power supply output is 0.8. The EPS power supply is mainly used for emergency power supply protection, and the load is usually inductive or capacitive. Some loads are required to be put into use after a power failure. All EPS power supplies must be able to provide a large inrush current, usually requiring continuous power supply for more than 10 minutes under the condition of 120% load. The rated capacity of UPS power supply is in KVA, and the rated capacity of EPS power supply is in KW.
EPS power supplies are mainly used for fire-fighting loads and some equipment that does not require high switching time but needs continuous power supply. UPS power supply is mainly used for computers, digital information systems and other loads that require high power supply quality.
2. Differences in functions
Both EPS power supplies and UPS power supplies have utility bypass and inverter circuits, but EPS power supplies only have the function of continuous power supply , The requirement for inverter switching time is not high. At present, most EPS power supplies also have the function of battery cell detection. The EPS power supply does inverter output after the mains power is interrupted, and the power utilization rate is high.
The UPS power supply generally emphasizes its three major functions: stabilizing the frequency and voltage of the mains; supplying power to equipment with extremely high switching time requirements; purifying the mains. Daily focus on rectification and inverter double conversion circuit power supply, power utilization is not high. However, the UPS power supply is not only inverting the power supply when the power is cut off, but also can provide stable power output when there are abnormal conditions such as large voltage deviation and surge in the mains, which is not available in EPS power supplies.
3, the difference in application fields
EPS is mainly used in my country For fire-fighting loads and some electrical equipment that does not require high power supply quality, but needs to ensure continuous power supply. Only the function of continuous power supply is emphasized. When EPS is used for fire protection, its product technology is certified by the Ministry of Public Security. UPS is generally used in computer and digital information systems and other occasions. Loads requiring high power supply quality mainly emphasize inverter switching time, output voltage, frequency stability, pure output waveform, and no various interferences.
