As society enters a stage of rapid development, people's dependence on electricity is also increasing, and their demand for electricity is also growing. If there is a power outage in the power supply system, it will have a negative impact on people's daily life and work. Therefore, it is necessary to do a good job in maintaining the power supply system. This article mainly discusses the working principle of UPS power supply and conducts in-depth analysis on the selection, configuration, maintenance and upkeep of UPS power supply and battery, ensuring that UPS power supply can operate smoothly and meet people's daily electricity needs.

Keywords: UPS power supply; Battery; Selection and configuration; maintenance

With the continuous development of the economy and the improvement of people's living standards, the demand for electricity in daily life is also increasing. In order to carry out corresponding work, it is necessary to choose a reasonable power supply configuration and do a good job in maintaining UPS power supply and batteries. In the selection and configuration stage of UPS power supply, it is necessary to choose the power supply reasonably according to the requirements of various devices, and the battery, as the power supply template of UPS, also needs to be selected and configured to effectively ensure the continuity of power supply. In the process of selecting, configuring, and maintaining UPS power supplies and batteries, it is necessary to carry out relevant work according to the structure of the power supply and battery, in order to extend the service life of the power supply and eliminate possible equipment failures as much as possible.

1. Working principle of UPS power supply

The power system mainly includes four parts: rectification, energy storage, conversion, and switch control. The rectifier stabilizes the voltage of the system and effectively controls the changes in internal and external currents; Energy storage mainly serves the purpose of purification, effectively reducing interference pulses and maintaining a certain level of stability; If the internal and external frequencies of the power supply are different, they need to be adjusted through a converter; The switch control device can effectively control the changes in UPS power supply. Control the rectifier, energy storage battery, converter, and switch control together to achieve control of the UPS power supply. Generally speaking, UPS power supplies are mainly float type, and DC converters can effectively increase the voltage of batteries. The interaction between rectifiers and converters is mainly manifested in the interaction between current and power, thereby achieving power flow. During the UPS charging process, the voltage mainly corresponds to a ratio of 1: 1.25 times, and then the inverter reverses to supply power to the load, which enables the UPS power supply to operate.

2. Selection and configuration of UPS power supply and battery

2.1 Selection and Configuration of UPS

When selecting and configuring UPS power supply, the following issues need to be considered: firstly, input the switch selection into the UPS power supply system. Although most of the circuit breakers currently used in the power supply system are low-voltage circuit breakers, relevant personnel need to pay close attention to the position of the leakage protection device when selecting the input switch for the UPS power supply system. The leakage protection device cannot be installed at the front end of the UPS power supply. In addition, the phenomenon of disconnecting the neutral wire is also a key issue that needs to be paid attention to. If this phenomenon is not handled properly, it will cause the circuit to break when the current operates, and even lead to more serious safety accidents. Secondly, in the signal transmission room, the selection of UPS power supply generally requires high standards, and the selected UPS power supply performs well in terms of intelligence. Applying this highly intelligent power supply in practical life can ensure that the power supply achieves the purpose of three-phase output and input. At present, among the selected UPS power supplies, the highly intelligent UPS power supply belongs to the most high-end and cutting-edge models at the current stage, which can effectively avoid the common fault problems of many power supplies.

2.2 Selection and configuration of batteries

The battery is the most critical part of the power system, and its quality can directly affect the backup power supply time of the UPS power supply. At present, the most frequently used battery in practice is sealed lead-acid battery. In order to ensure the smooth operation of UPS power supply, it is necessary to choose sealed lead-acid battery reasonably. In the process of selecting battery models, the most important thing is to ensure the stability and safety of the battery, and try to avoid problems such as battery expansion and damage. In addition, it is necessary to conduct a scientific and reasonable analysis based on the reserved space of the computer room and its own economic situation. In the selection stage of batteries, the most important thing is to pay attention to the discharge performance of the battery. It is not only necessary to ensure that the voltage of the battery remains stable during the discharge stage, but also to ensure that the battery has good voltage resistance and impact resistance during the power generation process. During the operation of UPS power supply, if there is a power outage, the battery needs to give a warning signal in a timely manner to provide sufficient DC power to the inverter, maintain the discharge voltage value at a standard data, and ensure that the voltage remains stable at all times.

3. Maintenance and upkeep of UPS power supply and battery

3.1 Maintenance and upkeep of UPS power supply

UPS power supply is a regulated power supply different from ordinary power supply. In practical applications, it is necessary to fully utilize the performance characteristics of UPS power supply to ensure that computer systems can still operate normally in emergency situations. To maintain the UPS power supply and address any issues that may arise during operation, it is necessary to understand the performance indicators of the circuit and perform proper maintenance to reduce the probability of power failure. Therefore, the following methods should be used to maintain the power supply. Firstly, do a good job in preventing induced lightning damage to UPS power supply. In thunderstorm weather, lightning strikes are mainly caused by a series of reactions to the ground and air, especially for UPS power supplies, which are particularly sensitive to electromagnetic pulses from lightning. This damage can easily damage the power and communication lines of equipment. Therefore, relevant measures need to be taken to ensure the safety of power supplies and prevent lightning strikes from damaging electrical appliances. Secondly, conduct a comprehensive inspection of the operation of the UPS power supply, and relevant personnel need to measure the mains power output of the power supply. During the maintenance of the power supply, relevant personnel need to check the conversion status of the power supply to ensure the safety of its operation; In addition, relevant personnel need to inspect the installation environment, mainly including the humidity and grounding conditions of the surrounding environment, to ensure the safety and stability of the UPS power system operation. Thirdly, do a good job in dust prevention and maintenance. In general, during the operation of equipment, it is necessary to minimize the frequency of maintenance and upkeep. Various impurities in the air entering the system can have a certain degree of impact on the power system. Therefore, it is necessary to do a good job in dust prevention and removal

[3] . In the daily inspection process, in addition to observing whether the connections of the equipment are loose or not, it is also necessary to check the hygiene condition of the power system. If not cleaned in a timely manner, it will lead to poor heat dissipation of the power system, which can cause serious system failures.

3.2 Maintenance and upkeep of batteries

As an important component of the UPS power system, the cost of the battery accounts for a relatively high proportion of the power system. Therefore, in order to ensure the normal operation of the UPS power system, it is necessary to do a good job in the maintenance and upkeep of the battery, effectively preventing battery failures caused by improper maintenance and increasing the operating cost of the power supply. If the battery is repaired and replaced frequently, it will have a negative impact on the operation of the power supply system, and even the high cost will bring financial pressure to the operation of the power supply system. Compared to replacing and repairing the battery, developing a reasonable maintenance plan can achieve maximum economic benefits. In the process of battery maintenance, it is necessary to pay attention to the following aspects: firstly, the temperature of the battery operating environment needs to be controlled within a certain range, avoiding temperatures exceeding 30 ℃ or falling below 15 ℃, in order to ensure that the battery can fully exert its maximum efficiency. Otherwise, excessively high or low temperatures will have adverse effects on the battery life and capacity; Secondly, it is necessary to regularly manually cut off the power of the battery to prevent it from running for too long and shortening its usage time. It is important to maintain the working condition of the battery and avoid excessive use, which may affect its service life and efficiency; Thirdly, it is necessary to control the amount of current in the battery within a certain range. If the current is too high, it will cause deformation of the battery's inner plates, hindering the normal operation of the battery.