Backup power supply is a system equipment that connects the storage battery (mostly lead-acid maintenance-free storage battery) with the main engine and converts direct current into mains electricity through module circuits such as the main engine inverter. Simply put, if there is a power failure, the storage battery in the backup power supply will supply power to the load immediately. When the mains supply is normal, the backup power supply will provide power protection for the load and output stable and pure mains supply. Widely used in: factories, hospitals, storage equipment, large servers, data centers, computing centers, (military) accusation centers, control centers of large factories, aerospace and its control centers, and all other non-interruptible operations scenarios.
According to the customer's requirements of backup time, load size, mains voltage, usage scenarios, etc., we can configure different batteries for the customer, and use UPS, EPS power supply or DC screen.
DC Screen is short for DC power operating system. The general name is intelligent maintenance-free DC power supply screen, which is called DC Screen for short. The general type is GZDW, and the DC screen is used to supply this kind of DC power supply.
The power operation power supply in power plants and substations now uses DC power supply, which provides power supply for control load, power load and lighting load of DC accident, and is the basis of control and protection of modern power system. The DC screen consists of mating electric unit, charging module unit, step-down Silicon chain unit, DC feed unit, power distribution monitoring unit, monitoring module unit and insulation monitoring unit.
DC screens are mainly applied to small and medium-sized power plants, hydropower stations, various substations and other users who use DC equipment (such as petrochemical, mine, railway, etc.) in the power system, and are applicable to the occasions such as switch-off and secondary circuit instruments, meters, relay protection, fault lighting, etc.
High voltage distribution room uses DC screen as the electrical power supply for controlling, protecting, monitoring and operating circuit breaker; AC is also OK; It is mainly decided by the type of power supply for controlling and operating circuit breaker. The direct current screen has the following advantages:(1) the direct current screen does not need to consider the three-phase balance problem;(2) the direct current screen is safe and reliable.
The DC screen can fully charge the battery pack in advance when the AC power supply is normal. When the AC power supply is out of power, it is fed by the battery, which can still ensure the operation, control, protection and monitoring of the circuit breaker.
UPS is a single closed-loop control system of voltage feedback, so its output voltage sine wave waveform and voltage dynamic adjustment precision is better; While EPS inverter control system is a multi-closed-loop control system composed of voltage and current feedback, and its output power has strong overload capacity and load adaptability. High reliability.
The power supply object of UPS is computer and network equipment. There is little difference in load properties, so the output power factor of UPS is 0.8 according to the national standard. EPS is mainly used as the Emergency Guarantee of power supply, and the load properties are inductive, capacitive and rectifying loads. On-line UPS ensures uninterrupted output power supply and high quality power supply. Inverter is preferred; While EPS power supply is preferred to ensure emergency use.
Both of them have mains electricity bypass and inverter circuit, but EPS only has the function of continuous power supply. Generally, the requirement of inverter switching time is not high, and there can be multiple outputs. Some EPS are also equipped with battery monomer monitoring function.
In our country, EPS is mainly used for fire-fighting loads and some electrical equipment that do not have high requirements on power supply quality but need to ensure continuous power supply, only emphasizing the function of continuous power supply. When EPS is used for fire load, its product technology is certified by the Ministry of Public Security. UPS is generally used in computer, digital information system and other occasions. Load with high power supply quality is required, which mainly emphasizes inverter switching time, output voltage, frequency stability, purity of output waveform, no interference, etc.
Power distribution DC Screen, UPS power supply and EPS power supply are all important power distribution devices in production and life, providing power supply guarantee for our production and life. Although the three power supplies are different, they are all used as power distribution equipment, providing stable and reliable power supply for domestic and production electricity, and play an important role in application places.