First, system overview
The commissioning of telecontrol automation telecontrol information is a task that must be completed before the new substation is put into production. In the past, it was necessary to wait until the substation's supporting optical fiber channels were opened before debugging. In recent years, due to the severely hindered erection of infrastructure lines, it is often necessary to open the fiber channel several days before the new substation is put into operation, leaving the time for debugging remote automation information extremely urgent. For this reason, the relevant communication, automation, and protection and debugging personnel all need to work overtime and work overnight. Once the debugging is not smooth, the progress of infrastructure construction will be affected. At the same time, due to tight schedules and pressure, many legacy problems are often generated and security risks are posed. Therefore, it is particularly urgent to open a temporary debugging channel based on “public network†between the main station and the new substation, and the remote communication security gateway device has provided an effective means to solve the problem.
Second, the system description
The remote temporary debugging channel system consists of a master station security gateway and a substation security gateway. The equipment is installed in the main engine room of the dispatching system and the main control room of the new substation. The data communication flow is as follows: The substation remote communication host is connected to the substation security gateway through the serial port or the network. The security gateway authenticates the data based on the power dispatch digital certificate, and the protocol encapsulates the encryption and sends the data to the main station security gateway through the GPRS network. After authentication, protocol encapsulation and decryption, security isolation, and Other measures, it is connected to the master EMS system pre-communication system through a serial port or a network.
Channel communication mode selection
Selecting the GPRS/CDMA wireless public network platform to build a temporary channel has the following advantages:
Strong portability, as long as the GPRS/CDMA signal coverage is available for use;
Low channel cost, no special wiring, low investment, low upgrade and maintenance costs;
Strong real-time, real-time online, delay less than 2S, meeting the delay requirements of telecontrol communication channels; 4) High transmission rate, actual data transmission rate of GPRS/CDMA is above 40Kbps, and it can meet the telecontrol data transmission rate (≥10Kbps) Demand
· Low communication costs, using monthly or metered billing, and low operating costs.
Third, the system block diagram
Fourth, product list and advantages
A, 104-1649CLD2NA motherboard
B. Trimmed professional LINUX system
C, power module
D, GPRS/CDMA module;
E, data encryption module
V. Conclusion
Compared with the previous construction of the temporary fiber channel, the GPRS/CDMA wireless communication period has less investment and flexibility. Automatic remote information debugging can be involved in the early stage of commissioning of the substation, early detection of signal transmission errors, and from the practice to solve the new substation widely dispersed, long fiber optic installation period, and thus delay the signal verification and many other issues. The remote communication security gateway equipment adopts the 104-1649CLD2NA motherboard with high reliability and stability, which is of great significance for improving the efficiency of infrastructure and commissioning for communications and telecontrol professionals and shortening the abnormal operating time of regional power grids. .
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