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There are many types of power supply equipment, which are greatly affected by external factors. If maintenance is not effective, the overall failure rate of the equipment will be high, the power environment monitoring system will lose its effectiveness, the operating cost will be large, and the base station will have many unsafe factors. In order to reduce operating costs and prevent early scrapping of battery packs, we now analyze the mains power environment of the base station and focus on power supply maintenance, and propose solutions.
1. Environmental factors of base station mains electricity
In the entire communications industry, the environment in which mobile communication base stations are located is relatively complex. The construction introduced by city power is limited by the environmental conditions of the base stations. The construction configuration requirements are different, and the maintenance requirements are different. For example, many base stations are built on high buildings or high mountains. . Objectively speaking, the mains electricity environment of the base station is not as demanding as the exchange office, but the quality of the battery is relatively high. This adds a lot of difficulties to the configuration, maintenance and management of the battery pack. If not maintained properly, it will cause the battery pack ’s Early failure.
(1) High-rise base station
Such base stations are located in cities, and the power supply is generally stable. The two major factors that affect the mains power outage time are: when the city's energy is relatively tight, the power supply department presses the city's load. This problem generally occurs in summer, the user's phone is depressed, and the mains failure occurs. Most of these cases are owners There is no self-provided oil generator to generate electricity, and the failure time generally does not exceed 24h. For such problems, measures to limit the DC load with the cooperation of the power environment monitoring system should be taken to prevent the battery pack from over-discharging, and the maintenance and charging of the battery should be strengthened afterwards.
(2) Alpine base station
Refers to the base station of rural hills far from the city. Such base stations use agricultural power and have high requirements for the construction of city power. The author believes that the construction of this kind of base station should be based on local conditions and safety conditions to select a higher way to introduce the mains, the conditional best to use 10kV high-voltage mains introduction. In the rural power supply, the introduction of high-voltage mains electricity is more stable than that of 380V mains electricity, and is less affected by human factors. If possible, an automatic generator set can be configured to automate AC power supply. The base station is located in a rural hill. Due to the inconvenience of the mobile oil engine to connect to power generation, the base station is equipped with an automatic power generation unit, and the over-discharge situation caused by the problem of mains electricity, coupled with the cooperation of the power environment monitoring system, can promptly deal with the system problems. This can ensure that the mains power supply is stable and reliable, and ensure smooth communication.
(3) General base station
No matter what base station, it should pay attention to the introduction of mains power. The introduction of mains power of any base station will go through a process from construction to maintenance, and then further optimize and perfect according to the local mains power situation to ensure that when the mains power is blocked Reliably connect the fixed oil machine or mobile oil machine to charge the battery pack. Therefore, the mobile oil engine power generation connection should establish a "mobile oil engine power generation system" to ensure that with the cooperation of the power environment monitoring system, timely, reliable and safe operation is performed, and battery maintenance is well done. [next]
Second, battery maintenance
Battery maintenance is the focus of the entire power supply maintenance work, and all power supply maintenance is carried out around this work. Generally speaking, the key to valve-regulated lead-acid battery maintenance is to control the temperature of the environment and charge and discharge of the battery. Therefore, controlling the charge and discharge of the battery is an important part of battery maintenance. The charging of the battery is divided into floating charging and balanced charging. The so-called floating charge refers to the parallel operation of the battery and the switching power supply when the mains power is normal. The output voltage of the switching power supply meets the requirements of the battery manufacturer. It is generally 2.23V / pc. From the definition, we can see that the float charge voltage can only meet the needs of the battery's self-discharge and oxygen cycle, and cannot be used as a supplementary charge after the battery is discharged. The supplementary charging of the battery is completed by the balanced charging of the switching power supply. When equalizing, the charging voltage is increased to 2.35V ～ 2.40V / piece, and the battery is charged with a current less than or equal to 0.10C10A. The charging process is controlled by the switching power supply, which is realized by the intelligent control of the switching power supply. In daily maintenance, it can be regularly checked by the power environment monitoring system to prevent changes in the parameters of the rectifier equipment and avoid damage to the battery.
1. Battery selection configuration
Improper use of the battery will directly affect the battery's future operation effect and service life, especially the base station battery is greatly affected by the city power, and more attention should be paid to its selection skills. When selecting the battery of the base station, three factors should be considered: the nature and size of the load, the load requirements of the equipment room, and the basic battery support time.
(1) Load nature and load size: including power consumption of main equipment, power consumption of transmission equipment and power consumption of monitoring equipment.
(2) Load requirements of the machine room: the load after the treatment of the house. For safety reasons, when all equipment is installed, the building load must not be exceeded.
(3) Basic battery support time: mainly refers to the emergency treatment time after the failure of the AC power supply equipment. The support time is usually determined according to the city power conditions, and the 8 ~ 10h support time is generally selected.
The power requirements of the main equipment of the base station are not as high as those of the exchange equipment. The blocking of the power supply of the base station will not cause the loss of data and cannot be recovered. There is no need to use two batteries in parallel. After our long-term use observation, under the mains electricity environment of the base station, the parallel connection of two sets of batteries is not conducive to the long-term use of the batteries in harsh conditions, because the two sets of batteries are completely in two different chemical collections, subject to factors such as battery connection and nut tightening. It is not easy to keep the internal resistance of the two groups of power supplies consistent. After a period of operation, the internal resistance of the battery changes and individual batteries fail to get supplemental charging for a long time, resulting in lagging batteries, so the probability of battery capacity damage is lower than that of one group. The battery should be high when used alone. The author believes that the base station battery configuration is better.
2. Pre-check and pre-fix
The occurrence of any equipment failure has a process from accumulation (the increase of unsafe factors exceeds the allowable limit of its equipment) to a concentrated outbreak. We can only grasp the initiative of maintenance work if we are more familiar with the environmental factors in which it is located and taking precautionary measures.
Three factors that affect the normal operation of power supply equipment: the impact of seasonal changes on power supply; the influence of human factors on power supply system; the aging of equipment.
(1) The impact of seasonal changes on power supply: In the rain and fog weather after winter, the insulation capacity of outdoor lines is reduced, and heating appliances are increased, which is a period of frequent power failures. In addition, the humidity is high in summer, the insulation capacity is relatively low, and refrigeration appliances are large-scale Increase is the period of frequent power failures. In order to prevent major accidents and eliminate hidden dangers, safety inspections should be strengthened, focusing on the introduction of mains lines, substation equipment, and air conditioning units.
(2) The impact of human factors on the power supply system: For rural public transformers connected to 380V or 220V power supply, it should be prevented from causing major failures due to the mistake of the fire neutral line.
(3) Aging of equipment: Most of these failures are the aging of cable lines. [next]
3. Attach importance to the construction and maintenance of power environment monitoring system for power supply auxiliary equipment
The base station power environment monitoring system is an important remote online testing tool to ensure the normal operation of mobile supporting equipment under unattended conditions, and is the basic network for supporting equipment maintenance. Therefore, the maintenance management of the base station power environment monitoring system is to ensure the stability of the remote power supply system. , The basis of reliable operation. The focus of the maintenance work of the base station power environment monitoring system is to prevent system false alarms, improve system stability, and complete system measurement functions. The basic tasks are:
(1) Ensure the smooth operation of the base station power environment monitoring system, regularly clean up and store important information to prevent virus invasion.
(2) Ensure that the electrical detection performance, equipment control performance, system alarm performance, important maintenance technical indicators and network indicators of the supporting equipment of the base station power environment monitoring system meet the standards.
(3) Reasonably adjust the system network to ensure the safe operation of the system, increase the utilization rate of equipment, extend the use time of system equipment, and maximize its effectiveness.
(4) Eliminate the fault quickly and accurately to avoid the impact of the system fault on the supporting equipment and the loss caused by the delay of the equipment maintenance time.
(5) Adopt new technologies, optimize system configuration, improve maintenance methods, and improve work efficiency.
(6) Maintain technical data properly, and the project completion information includes system line configuration diagram, intelligent device communication protocol text, protocol development completion document and equipment configuration list.
(7) In principle, the expansion and upgrade of the monitoring system must not affect the normal operation of the system. If it affects the system, the affected part, processing time limit, and processing plan must be explained before the expansion and upgrade, and can only be implemented after approval by the relevant management department.
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