Application of Monitoring Technology in Communication Power Supply
It has been 10 years since the first set of communication power monitoring system development experiment of Fuzhou Telecom Bureau in the early 1990s as the starting sign of power monitoring. During this period, the power monitoring system has made great development in both technology and system implementation scale, and people's understanding of computer centralized monitoring system has been greatly improved, At present, the development of centralized monitoring technology of communication power supply and the implementation of monitoring system have entered a new era.
This creates a good environment for the further development of communication power monitoring technology and the further implementation of monitoring system. But at the same time, we also notice that many new problems are exposed in the process of its development, such as fault diagnosis and analysis under the condition of flexible hardware configuration and continuous improvement of software function of the monitoring system. The performance in the direction of high intelligence such as data statistics has not been better developed. In the past, the report mode of one hour meter reading under the mode of manual guard and maintenance is still reflected in the power monitoring system, and the reliability of the monitoring system still exists. Now we will discuss the development of the monitoring system and the problems exposed during the implementation of the monitoring project.
In terms of function, in order to meet the requirements of few people and unattended power supply equipment, the power supply monitoring system emphasizes the rapid response to power supply equipment fault events and the accuracy of fault alarm. Now, based on the continuous improvement of basic functions, such as remote control, remote signaling and telemetry, monitoring information query, data storage and recording, real-time historical trend, system configuration, remote operation, password management, support networking and so on, the power monitoring system continues to expand new intelligent systems.
1. Intelligent device access
Because there are many types of communication power supply equipment, even for the same type of equipment, the protocols of different manufacturers are different. In addition, there are many manufacturers of power supply equipment, so there are more types of protocols. In the implementation of the monitoring system, in order to make better use of the resources of intelligent equipment, The intelligent equipment is directly connected to the monitoring system through the conversion of communication interface and communication protocol. The communication interface basically belongs to the hardware conversion between RS232, RS485 and RS422, which is relatively easy to realize. The conversion of communication protocol has been a thorny problem perplexing the implementation of the monitoring system in the past. At present, this problem has been preliminarily solved, On the one hand, most power equipment manufacturers can actively provide the communication protocol of their equipment, on the other hand, the original Ministry of Posts and Telecommunications provided the agreed protocol for intelligent equipment. It provides conditions for protocol conversion. At present, the conversion of communication protocol and communication interface should be in the form of protocol converter. The so-called protocol converter is to connect a device called protocol converter between the intelligent device and the local station monitoring host, one end is connected with the serial port of the intelligent device, and the other end is connected with the serial port of the local station monitoring host, so as to complete the conversion of communication protocol and communication interface. In short, the protocol converter is a microcomputer system with CPU, EPROM, ram, serial communication port, etc. the protocol conversion generally has two conditions: first, there are at least two serial ports and they match the serial ports of the converted intelligent device and the local station monitoring sovereignty respectively; second, the communication protocol of the intelligent device is converted into the local station monitoring host protocol, The conversion software is solidified in the EPROM of protocol conversion. This method is more effective when multiple intelligent devices with different protocols are connected to a monitoring host at the same time. Another conversion method is to put the protocol conversion function in the local station monitoring host, but this conversion method is rare in practical application, because this method is only suitable for connecting intelligent devices with single protocol to a monitoring host. If too many protocol types are changed in the monitoring host, the monitoring host will be overburdened, It not only affects the normal work of the monitoring host section, but also brings many difficulties and problems to the development of monitoring host software. In addition, the introduction of a unified communication protocol provides a better solution for intelligent device access.
2. Reliability of monitoring system
As new technologies, new processes and high-quality devices are more widely used in the production and manufacturing of communication power supply equipment, the reliability and automation of the monitoring system have been greatly improved, such as intelligent equipment such as switching power supply equipment, ups and diesel generator set, as well as non intelligent equipment such as valve controlled battery pack, which are widely used at present, This provides a good condition for the centralized monitoring and management of communication power supply and the purpose of few people and unattended communication power supply equipment. The reliability of communication power supply monitoring system is also very important, because the reliable establishment and development of monitoring system affects whether the maintenance and management level of communication power supply equipment can be improved, the power supply quality of communication power supply can be improved, and the purpose of few people unattended can be realized. Therefore, based on the continuous improvement of the performance of the power monitoring system, we should pay attention to improving the reliability of the monitoring system. The communication power monitoring system is a large-scale real-time network system.
3. Improve the self inspection function of the monitoring system
In order to make the monitoring system play its role more effectively, we should not only constantly improve the basic functions of the monitoring system, but also pay attention to the use of the advantages of computer data processing to develop and improve high intelligent performance. Fundamentally change the traditional maintenance mode and make effective use of monitoring technology.
The implementation of the monitoring system is based on the new maintenance mode, that is, the regional monitoring and management center is used to monitor and manage the corresponding Bureau and station, the Bureau and station are few and unattended, and the urban monitoring and management center is responsible for the unified management of its regional monitoring and Management Center. In addition to the difference in maintenance management mode, the greater difference between this computer-based centralized monitoring management and manual guard management is that the monitoring system realizes computer automatic real-time monitoring of communication power supply equipment. If the power supply equipment fails, the monitoring system will respond quickly and report to the corresponding management center in time. In order to adapt to this computer monitoring and management mode, it is required to fundamentally change the traditional maintenance mode. However, we note that although the implementation of the monitoring system is based on the new maintenance mode, the requirements for the monitoring system still leave traces of the manual supervision maintenance and management mode, such as the routine meter reading once an hour in the past manual supervision period, The purpose is to check the equipment regularly. Now the computer monitoring system is adopted, which is characterized by real-time monitoring of the power supply equipment, but it puts forward the requirement of reading the meter every hour, which is stored and printed in the form of daily reports. At the same time, these reports should be stored for 2 to 3 years. As a result, printing and storing these data in the monitoring system takes up a large amount of resources of the monitoring system, but these data can rarely be used. In the face of these problems, some functions of the monitoring system should be reconsidered:
(1) On the basis of continuously improving the reliability of controlled equipment (power supply equipment), comprehensively improve the safety and reliability of monitoring system.
(2) Considering the controlled equipment and monitoring system as a whole, since the safety and reliability of power supply equipment and monitoring system can be basically guaranteed (the reliability index requirements of power supply equipment are: switching rectifier equipment MTBF 50000h, valve controlled battery MTBF 350000h, AC / DC distribution equipment reliability index requirements are higher, and the reliability index requirements of monitoring system MTBF 100000h) , the implementation of the monitoring system should be simplified, practical and highly intelligent, while ensuring the accuracy and rapidity of the alarm and pre alarm performance of the monitoring system. In addition, the continuous improvement of the intelligent function of statistical analysis makes the function of reading meters every hour meaningless.
(3) Update people's past maintenance concept of manual supervision and establish a new maintenance system.
Therefore, another important work for the implementation of the monitoring system in the future is to fundamentally change the traditional maintenance mode, make more effective use of monitoring technology, and make the power monitoring system play a greater role in the maintenance and management of communication power supply.
4. Network access detection of monitoring system
It is very difficult to detect the monitoring system, which will be limited by the following conditions:
(1) The implementation of monitoring system testing requires standard basis in terms of testing items, indicators, testing conditions and testing methods. At present, although there are some technical requirements for monitoring system, it is far from enough as the standard basis for monitoring system testing.
(2) Compared with the general power supply equipment, the monitoring system adopts more computer technology and emphasizes the network of the system, the real-time performance of the system software and the functionality of the system, which makes it difficult to evaluate the practicability and technical performance of the monitoring system.
(3) The monitoring system is a large-scale real-time network system with certain capacity characteristics (including software capacity characteristics and hardware capacity characteristics). The realization of various performance indicators is meaningful only when it runs at full capacity. As the detection of the performance indicators of the monitoring system, it is impossible to establish a full capacity system.
(4) Limited by other aspects such as communication mode and communication conditions.
It can be seen from the above situation that it is indeed difficult to detect the monitoring system. Even so, it is necessary and meaningful to describe and evaluate the performance indicators of the monitoring system through certain methods to detect the monitoring system to achieve the maximum approximation.
