On March 20, the provincial time and frequency traceability comparison system of State Grid Mengdong Electric Power Company was officially put into operation. The maximum standard deviation of the system's daily monitoring data from the State Grid Measurement Center was less than 200 nanoseconds, meeting the requirements of construction standards and completing the construction one year in advance. The construction task of remote real-time traceability comparison required by the three-year action plan for the construction of a modern advanced measurement system of State Grid Corporation.

It is reported that the provincial time and frequency traceability comparison system uses satellite common viewing equipment as the main standard and uses "satellite common viewing technology" to receive Beidou satellite navigation signals. They can be traced to the national time and frequency benchmark and transmitted to professional application systems. It has the functions of real-time remote traceability transmission and evaluation of related equipment.

"We have built a provincial-level time-frequency traceability system with high precision, high stability and unified traceability, which can be subsequently applied to marketing electricity information collection systems, automated verification lines and other businesses. The system not only saves the labor, time and expenses required for transporting time-frequency standard equipment, avoids additional losses and risks that time-frequency standard equipment may suffer during transportation, but also solves the problem of time-frequency traceability and can achieve accurate Time and frequency transmission." Huang Bin, director of the Power Supply Service Supervision and Support Center of State Grid Mengdong Electric Power Company, told reporters.

The reporter learned that as China's power system steps up the planning, layout, construction and application of smart grids, the importance of time and frequency has become increasingly prominent. The frequency parameter in the power grid is an important parameter for judging power quality, an important indicator for power system operation, and an important factor affecting the safety and stability of the power system. During the construction process of the system, State Grid Mengdong Electric Power Company reasonably plans the cable direction and antenna position, which can effectively prevent personnel from accidentally touching it. At the same time, State Grid Mengdong Electric Power Company actively communicated with the State Grid Metrology Center to complete the IP address binding of the system, connect two inputs to the multi-channel frequency switching synthesizer, and make it mutual backup after debugging to achieve successful communication with the State Grid Metrology Center.

In the next step, the company will communicate with the Market Supervision and Administration Bureau of the Inner Mongolia Autonomous Region to apply for the establishment of provincial time and frequency measurement standards, establish a time and frequency measurement traceability system, carry out time and frequency measurement transmission, and provide high-precision time and frequency applications for power grid enterprises. Technical support.

author:Li Donghai, Cao Meichao, Wang Yiwu

edit:Kong Kexing

proofreading:Tommy Cheung