Power plant NTP clock server (NTP clock synchronization) technical application scheme
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At present, the domestic power grid has gradually formed a modern large power grid with large units, ultra-high voltage and high automation as the main characteristics. The operation of the power grid is changing rapidly. After an accident, it is necessary to grasp real-time information and timely decision-making and processing. These are inseparable from a unified time benchmark. Mainly used for various automation and relay protection devices of power systems. These devices include: dispatch automation systems, electric energy billing systems, event sequence recording devices, fault recorders, microcomputer relay protection devices, power plants, substation monitoring systems, etc. . At present, in the domestic power system, the application method of time synchronization is to receive the wireless standard time signal sent by the navigation satellite and use the device that meets the corresponding specification requirements as the unified clock signal source, and then the unified clock signal source provides standards for various devices in the power grid. Time, time stamp output mainly includes 1PPS output, 1PPM output, IRIG-B output, NTP/SNTP, PTP, etc.
Power plant clock synchronization system
The HR-901GB power plant/substation time synchronization system is based on the company’s many years of research and development experience in the field of power time synchronization. It responds to the increasingly stringent requirements for safe operation of the time system from the majority of users, and takes into account the protection of national security. The current advanced circuit integration, software programming technology, combined with the respective technical characteristics of global satellite navigation systems such as M country GPS, China's Beidou, Russia's Gronas, and other global satellite navigation systems have developed a new generation of electric time synchronization system. The devices used in the system are all independently researched and developed by Slimin, which realizes multi-source input (GPS, Beidou, Gronas, high-precision punctuality, IRIG-B code reference, etc.), multi-standard output (TTL, empty contact, IRIG) -B, differential, serial port, network, optical fiber, etc.), multi-device application (system output. It can be expanded arbitrarily to meet the time signal needs of any scale and any method) combined applications for electric power, coal, rail transit, and petroleum Chemical industry, waterway and water transportation, post and telecommunications and related fields provide high-precision, high-stability, high-security, and high-reliability time reference signals.
The HR-901GB power plant/substation time synchronization system is composed of a master clock and a signal expansion device, which can be centralized or separate screens. Both the master clock and the signal extension device can be configured in combination according to the requirements of the site, using the second synchronization signal and time information sent by GPS (Global Satellite Positioning System), Beidou or IRIG-B (DC) code to send to various systems and automation Devices (such as dispatch automation systems, microcomputer relay protection devices, fault recorders, event sequence recording devices, remote control devices, computer data exchange networks, lightning positioning systems, etc.) provide accurate time information and time synchronization signals. It can fully meet the various requirements of "Technical Specifications for Unified Clock System of East China Power Grid", "Technical Principles and Operation Management Regulations of Shanghai Power Grid GPS Time Synchronization System" and "Technical Specifications for Power System Time Synchronization". Since the product was launched on the market, it has withstood many on-site operation tests and has been recognized and trusted by the majority of users.
The HR-901GB time synchronization system is mainly composed of a master clock, several slave clocks, and time signal transmission media. According to the different needs of the time synchronization site, the structure configuration of the time synchronization system has many forms, mainly divided into three types: basic type, master-slave type, master-slave type.
1. Basic formula
Composed of a master clock and signal transmission medium, it is the time synchronization device (system) for the time service. According to needs and technical requirements, the master clock can be provided with an interface for receiving the wired time reference signal issued by the upper-level time synchronization system. The system consists of a master clock screen, which is generally located in the control room of the power plant/substation/machine room.
2. Master-slave
It is composed of a master clock, multiple slave clocks, and signal transmission media, and synchronizes the time for the time-served equipment (system). According to actual needs and technical requirements, the master clock can be provided with an interface to receive the wired time reference signal issued by the upper-level time synchronization system. The system consists of a main clock screen or a multi-faceted clock expansion screen. The main clock screen is generally located in the control room of the power plant/substation/machine room. The number of clock expansion screens depends on the situation in the power plant/substation/machine room. The clock screen of each small room is responsible for the time synchronization of the secondary equipment in this small room.
3. Active and standby
It is composed of two master clocks, multiple slave clocks, and signal transmission media, and it synchronizes the time for the time-served equipment (system). According to actual needs and technical requirements, the master clock can reserve an interface to receive the limited time reference signal issued by the upper-level time synchronization system. This method can be divided into two main clocks with the same screen system structure and two main clocks with different screen system structure.
a) Two master clocks on the same screen system structure
The system consists of one main clock screen or multi-faceted clock expansion screens. The main clock screen has two main clocks. The number of clock expansion screens is determined according to the conditions of the small rooms in the power plant/substation. The main clock screen is generally located in the control room of the power plant/substation/machine room. The clock screen of each small room is responsible for the time synchronization of the secondary equipment in this small room.
b) Two main clocks with different screen system structure
The system structure is composed of two main clock screens or multi-side clock expansion screens, and each main clock screen has a main clock. The number of clock expansion screens depends on the situation of the small room in the power plant/substation. The clock screen of each small room is responsible for the time synchronization of the secondary equipment in this small room.