Communication power supply plays an important role in the communication room

Communication power supplies play an important role in the overall communication room. Faced with new developments such as telecommunications splitting and personnel reorganization, newer and higher requirements have been put forward for power supply maintenance and management.

The great development of telecommunications and the update of product technology in the past decade have made the current communication equipment present new characteristics of large network scale, high degree of intelligence, complex brand series, unattended operation, and high degree of centralized monitoring. However, the splitting of telecommunications, the reorganization of personnel, and the promotion of careers have made the development of maintenance human resources and technical forces lag behind the development of communication equipment. The maintenance personnel's dependence on manufacturers has increased, and the risk of loss caused by equipment failure has increased. As the heart of communication equipment, communication power supplies should also put forward newer and higher requirements for maintenance and management in the face of new situations. After several years of exploration, the author has actively communicated with brother units and power supply manufacturers, accumulated some experience, and proposed some exploratory methods on how to better do the maintenance and management of power supply equipment under the new situation.

Select power supply brands according to management objectives

At present, there are many brands of power supply equipment. According to the performance indicators specified in the network access inspection standards, the equipment of each company is similar, but in terms of structure, humanized design, intelligent monitoring, regional/specific environment solutions, and after-sales service guarantees, each company is very different. If these brand equipment are not selected properly, maintenance resources will be dispersed, strength will be weakened, maintenance work will be difficult to deepen, and after-sales service will be difficult to obtain manufacturer guarantees.

According to the management objectives, follow the principles and priorities of "ensuring reliable operation, controlled status monitoring, shortened maintenance time, and reduced costs" to inspect and screen brands and equipment. The number of preferred brands should not exceed 3, so that technical personnel can improve their technical level. With a certain scale of equipment, it is also easy to obtain better after-sales service conditions; at the same time, the same brand of equipment should be arranged to be used in the same area as much as possible, so that maintenance personnel can perform maintenance in a single and in-depth manner.

Investigation and execution of preventive work

Preventive work runs through the entire process of equipment selection, installation and maintenance.

Before selecting equipment, the working environment of the equipment (including geographical conditions, climatic conditions, mains power environment, on-duty conditions, support system, etc.) and the adaptability of the selected equipment to the working environment should be investigated in advance. Practice has proved that the functions and performance of some equipment are not necessarily applicable to all conditions. The failure rate of the same equipment in different working environments will be very different. Therefore, before selecting equipment, it is necessary to investigate the environment of the equipment, analyze the selected equipment, and listen extensively to the investigation opinions of the specific usage of telecommunications departments in other cities. Non-applicable functions should be removed or shielded; for important indicators, corresponding tests can be made when necessary, and even trial use can be made in experimental networks or non-important stations.

Installation and acceptance work is also a key point in prevention work. After the qualified products of the manufacturer have been transported and bumped many times (especially in mountainous areas), the internal and external electrical contacts may loosen and fall off at the installation site; the factory parameter settings may not be consistent with the actual situation, which will become hidden troubles in future operation. Eliminating and correcting these factors during installation and acceptance work will provide necessary guarantees for the reliable operation of the equipment in the future.

In basic management work, we first advocate active maintenance and preventive maintenance to eliminate the signs of failure. Through special governance and labor competition actions such as "power supply equipment power failure prevention before the peak power supply period in summer" and "strengthening the maintenance and pre-inspection and pre-repair of power supply equipment after the peak power supply period in summer, and improving the equipment integrity rate" every year, the maintenance technical team is trained, the enthusiasm of maintenance personnel is improved, and the quality of equipment maintenance management is improved in the form of self-inspection, mutual inspection, evaluation and communication. At the same time, make full use of various monitoring means to detect faults as early as possible, and then concentrate technical forces to deal with them as quickly as possible to shorten the duration of faults. For sudden and long troubleshooting time, which will cause power outages, emergency response plans should be formulated and regular drills should be strengthened.

Build a hierarchical support system

At present, the maintenance resources of the telecommunications system are still slightly weak compared to the total amount of equipment operation, and some equipment maintenance contractors do not have sufficient ability to solve and eliminate various faults in a timely manner. In this case, within the scope of the prefecture-level city, or expanded to the whole province, a hierarchical technical support system including technical expert groups, technical backbone teams, daily maintenance personnel, and manufacturer technicians is established. The hierarchical technical support is implemented through a step-by-step and real-time reporting process, which will be of great significance to the maintenance and guarantee of power supply.

Within the support system, the investigation of typical faults, the classification and statistics of various types of faults (such as quality, external factors, negligence, etc.), and the archiving of data files, information resource sharing and other measures will provide a good platform for the rapid improvement of the maintenance team's technology. Rational

configuration of the power supply system

The rational configuration of the power supply system must pay attention to the following points:

(1) In the AC power supply system, the automatic switching device should be gradually promoted, and the mechanical manual switching function should be equipped for emergency use. In large-capacity (above 2000kVA) AC power supply systems, it is recommended to use two sub-power supply systems (transformer and oil generator) for power supply respectively, and the sub-power supply systems use a contact cabinet for mutual backup, and the oil generator should not be used in parallel operation as much as possible. Important bureaus (such as hub bureaus, data centers, IDC centers, etc.) should strive to introduce high-voltage lines from two different substations to improve power supply reliability. Since large-capacity low-voltage circuit breakers generally do not have spare parts, once damaged, it takes a long time to determine the cause of the fault and repair it. The emergency plan should be activated in time to use temporary cables to bridge the temporary power supply (only when the short circuit factor is eliminated) to avoid the occurrence of battery discharge due to lack of time.

(2) The capacity of a single high-frequency switching power supply should not be too large. The number of power modules to be turned on should be determined based on the environment and fault conditions. For stations with overall destructive factors (such as overvoltage of the mains), the number of turned on should not be too large. The battery charging current is limited to 0.1C10. The rated current of the DC fuse should not be greater than 2 times the maximum load current to ensure that the fuse blows in time when the load end is short-circuited to avoid affecting the output voltage of the entire DC power supply system . (3) Large-capacity UPS is a difficult point in power supply maintenance and management. The "N+1" parallel mode should be used as the networking priority. The maintenance department must be involved in the design, review and installation. Pay attention to the following issues: The UPS main and bypass power supplies are preferably supplied by two air switches respectively; the UPS output neutral voltage is too high, which will increase the network data packet loss rate. Therefore, measures should be taken to reduce the UPS output neutral voltage to below 1V; UPS batteries should use single 2V valve-controlled sealed batteries as much as possible; for UPS equipment, focus should be placed on important indicators such as input power factor and harmonic content, especially to coordinate with the oil engine. The ratio of oil engine capacity to UPS capacity should be more than 2 times to ensure that both the oil engine and UPS can work normally. (4) Diesel generator sets as backup power sources must be kept in good backup status. The rated capacity of the oil engine selected for the telecommunications system is generally the backup power. When using it, pay attention to controlling the full load to less than 1h, and use 90% of the backup power for long-term operation. The ratio of engine power to generator power should be at least 1.1. Permanent magnet and DVR models are preferred for generators, which can effectively avoid harmonic interference of the load. At the same time, to ensure that the oil engine can fully play its role, the design should consider the electrical interlocking of automatic switching between the oil engine and the mains, and consider the ventilation, smoke exhaust, shock absorption and noise reduction of the oil engine room. Regular maintenance and testing should be carried out, and the starting battery and automatic oil pumping system should be checked frequently. (5) The battery is the core of the backup power supply of the telecommunications network. According to the requirements of the maintenance regulations, a set of operating procedures for battery capacity testing and verification capacity testing should be formulated, and battery capacity testing equipment should be customized and purchased, including battery capacity testers, mobile dummy loads, mobile chargers, and battery cell activation instruments, and equipped at various regional maintenance stations. In the future, the Fuzhou local network will gradually conduct capacity tests and verification tests on the batteries on the network, hoping to eliminate the hidden dangers of failure caused by batteries. For some access point batteries that are often discharged at low current for a long time





Capacitors It is easy to cause the problem of lagging batteries. It is advisable to adjust the automatic floating charge setting of the rectifier, adjust the number of rectifier modules turned on, and conduct capacity tests regularly. Practice has proved that the effect is relatively ideal.

The management of communication power supply should be continuously explored and improved based on technological development, management development and practical feedback. The ultimate goal is to continuously improve management work and improve equipment operation reliability.