Fault Indicator Monitoring System Electromagnetic Compatibility And Dust And Water Resistance
The Fault Indicator Monitoring System originated in Germany in the 1980s and was designed to indicate the way in which the short-circuit current flows through the distribution line to help people find the point of failure. China from the nineties began to introduce and learn foreign Fault Indicator Monitoring System development technology, and gradually evolved into a remote monitoring with the communication function of the distribution line fault location system. The system to Fault Indicator Monitoring System probe, terminal and backstage main station, as shown below. Overhead Fault Indicator Monitoring System and the terminal generally in a small wireless ad hoc network communication to achieve data communication, and cable Fault Indicator Monitoring System and the terminal may be a small wireless ad hoc network or optical fiber communication to achieve data delivery, due to the probe And the communication distance between the terminals is short, the data transmission rate is low, the logic level is simple, there is generally no communication reliability problem.
The communication between the Fault Indicator Monitoring System terminal and the background master station is generally carried out by means of public network GPRS. In order to measure the product quality and communication reliability level of the terminal, the background master station will generally count the online rate index as the basis of judgment. As the terminal and the backstage communication between the main station through the equipment, including the distribution terminal, GPRS module, the public network equipment, the background of the main station; and affect the complexity of the communication elements, involving power supply reliability, public network signal coverage quality , The agreement between the equipment consistency, etc., the current reflection of the Fault Indicator Monitoring System terminal online rate is generally not very high, or have a high nominal online rate, but in the event of a line failure, the signal can not be reliable transmission, affecting the user The overall experience of the fault location system.
The on-line rate of the fault location system is an important indicator of the reliable operation of the system, but it should also be clear that the fault location system based on public network communication is destined to be a non-real-time online system with an on-line rate approaching but difficult to reach 100%. The following is a brief analysis of the relevant factors that affect the online rate of the Fault Indicator Monitoring System terminal.
Good compatibility with communication protocols is the basis for reliable communication. The current Fault Indicator Monitoring System terminal and the main station more use 60870-5-101 / 104 protocol, but different manufacturers based on the understanding of the agreement and the configuration of the parameters are still a lot of differences in the system often need to adjust the time between manufacturers more detailed Of the communication, not only to the normal conditions of the communication process to verify, but also on the communication anomalies and extended operating conditions under the test logic. This part of the work belongs to the scope of equipment engineering development, the relevant verification needs to be fully guaranteed before the factory equipment.
2. Fault Indicator Monitoring System terminal
Fault Indicator Monitoring System terminal. As the Fault Indicator Monitoring System terminal installed in the outdoor and high voltage and high current in the strong electromagnetic field work environment, the operating environment is relatively poor, product design and production must meet the requirements of outdoor industrial products, such as temperature and humidity environment, electromagnetic compatibility and dust Characteristics and so on. As the current equipment manufacturers are highly competitive, the price of many products has been lower than the cost of industrial-grade products, product reliability problems are particularly prominent, Fault Indicator Monitoring System terminal communication interface, the level of interference is uneven, Type and purchase to be concerned.
3. Power supply
The Fault Indicator Monitoring System terminal has a reliable operating power source as a prerequisite for reliable data communication. Overhead-type Fault Indicator Monitoring System terminals generally use solar panels plus energy storage battery power supply. Cable Fault Indicator Monitoring System terminal to consider the economic performance and ease of installation generally use the current transformer to take power that is CT to take power. Can be seen, whether it is solar power or CT power, there is in the rainy weather or line current is too low when the power shortage is likely to affect the Fault Indicator Monitoring System terminal online rate indicators an important factor to improve its online rate: (Including solar panels, controllers, and storage capacity), or to improve the efficiency of the solar power take-off system (including the configuration of the appropriate area of solar panels, controller and storage capacity), or to improve the efficiency of the power collection system, (Including reducing the minimum operating current, increasing the energy level of the remaining energy and configuring the appropriate capacity of the storage capacitor or battery). In order to improve the terminal line rate indicators, many users one-sided pursuit of the capacity of the backup battery and CT to take the minimum operating current system, which is a misunderstanding, only the combination of terminal power and operating environment, integrated configuration of the appropriate power module and backup Battery capacity can achieve a better power supply effect, the specific approach in the follow-up article will be the topic of discussion.
4.GPRS communication module
The GPRS communication module is the key link to load the communication data on the wireless public network. It accepts the access management of the public network base station through the identity identification on the SIM card, and responds to the data transmission request of the terminal on the other hand. Communication between the main station, is the impact of Fault Indicator Monitoring System terminal online rate of the most critical and most complex link. Interference GPRS communication module reliable work more factors, including GPRS communication circuit design reliability, SIM card and card slot in harsh environments of mechanical properties (whether good contact), the public network parameters configuration management level. Some wireless public network support no SIM card data communication, reducing the SIM card contact failure caused by the possibility of data communication failure, is a better industrial design, but unfortunately the current support of the communication system is not a lot of conditions can be try.