阅读说明：本技术 一种跨越电力安全区的同源对时系统 (Homologous time synchronization system crossing power safety zone ) 是由 白维 张志辉 冯迅 曾金全 李政 卿启维 侯坤 于 2020-06-12 设计创作，主要内容包括：本发明公开了一种跨越电力安全区的同源对时系统,包括时钟源、对时装置、网络对时接口、网关机、网络对时接口与安全隔离设备。本发明能够实现数据只能从安全区I向外单向传递网络信息情况下的时标数据传输,同时实现时标数据统一并且同步,从而使得全站的用户主机设备的时间与时钟源所在的安全区的时间同步,且数据传输实时性强。(The invention discloses a homologous time synchronization system spanning an electric power safety zone, which comprises a clock source, a time synchronization device, a network time synchronization interface, a network shutdown machine, a network time synchronization interface and safety isolation equipment. The invention can realize the time mark data transmission under the condition that the data can only transmit the network information from the safety area I to the outside in a one-way, and simultaneously realize the unification and synchronization of the time mark data, thereby synchronizing the time of the user host equipment of the total station with the time of the safety area where the clock source is positioned, and having strong real-time data transmission.)

1. A system for performing a homologous synchronization across a power security domain, comprising:

the clock source, the time synchronization device and the network time synchronization interface are arranged at the first security area end;

the network shutdown and network time tick interfaces are arranged at the first safety zone end, the second safety zone end and the third safety zone end;

safety isolation equipment is arranged between the first safety area and the second safety area and between the first safety area and the third safety area;

the clock source is provided with a satellite positioning and time setting device and is used for receiving satellite positioning signals and acquiring standard time signals; the clock source is connected with the network shutdown machine of the first safety area end through the network time setting interface; the network shutdown port of the first safety zone end is respectively connected with the network shutdown devices of the second safety zone end and the third safety zone end through one-way safety isolation equipment;

the network time tick interface is used for outputting a time signal.

2. The system of claim 1, wherein the satellite positioning and time-setting device is a GPS or beidou satellite signal positioning and time-setting device.

3. The system of claim 1, wherein the clock source is configured with at least two network time tick interfaces.

Technical Field

The invention relates to the technical field of time synchronization, in particular to a homologous time synchronization system crossing an electric power safety zone.

Background

The safety partition is the structural foundation of the safety protection system of the power secondary system. An application system based on computer and network technology in power generation enterprises, power grid enterprises and power supply enterprises is divided into a production control area and a management information area (also called a safety area III) in principle, wherein the production control area can be divided into a control area (also called a safety area I) and a non-control area (also called a safety area II); according to the requirement of power network protection, all data streams of the production control large area need to be physically isolated before flowing into the safety area III, and real-time data flows out of the production control large area and needs to pass through forward isolation equipment, so that only intranet information and data can be transmitted in a one-way mode.

The time synchronization system of the power generation enterprise is generally a GPS or Beidou satellite time synchronization clock and is generally installed in a safety zone I, system equipment in the zone I can perform time synchronization with a time source through network time synchronization specifications (NTP), and the safety zone II and the safety zone III cannot perform time synchronization through an NTP direct network generally due to the separation of network isolation equipment. When the host of the three-area system can be connected with the internet, the time synchronization specification and the time server on the internet can also be performed through the network, but the time source used at the time is different from the time source of the one area, and a certain time difference is often generated.

For the construction of a data center of a power enterprise, in order to ensure that application systems with higher requirements on time accuracy, such as an online calling system and an online monitoring system of a safety zone III, can be applied, the time of a whole plant must be unified and synchronized, and the time of a host of a total station (including safety zones I, II and III) must be completely synchronized with the time synchronization system of one zone, so that the time axis alignment of the whole zone is realized; according to the requirement of power network protection, all data streams of the production control large area need to be physically isolated before flowing into the safety area III, and real-time data flows out of the production control large area and needs to pass through forward isolation equipment, so that only intranet information and data can be transmitted in a one-way mode.

Disclosure of Invention

In order to solve the above problems, the present invention provides a system for synchronizing time of a same source across a power safety zone, including:

the clock source, the time synchronization device and the network time synchronization interface are arranged at the first security area end;

the network shutdown and network time tick interfaces are arranged at the first safety zone end, the second safety zone end and the third safety zone end;

safety isolation equipment is arranged between the first safety area and the second safety area and between the first safety area and the third safety area;

the clock source is provided with a satellite positioning and time setting device and is used for receiving satellite positioning signals and acquiring standard time signals; the clock source is connected with the network shutdown machine of the first safety area end through the network time setting interface; the network shutdown port of the first safety zone end is respectively connected with the network shutdown device of the second safety zone end and the network shutdown device of the third safety zone end through safety isolation equipment;

the network time tick interface is used for outputting a time signal.

The invention has the beneficial effects that: the invention can realize the time mark data transmission under the condition that the data can only transmit the network information from the safety area I to the outside in a one-way, and simultaneously realize the unification and synchronization of the time mark data, thereby synchronizing the time of the user host equipment of the total station with the time of the safety area where the clock source is positioned, realizing the time shaft alignment of the whole area and having strong real-time data transmission.

Drawings

FIG. 1 is a system diagram of the present invention;

fig. 2 is a schematic diagram of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1, the present invention provides a system for synchronizing time of a same source across a power security domain, which includes:

the clock source, the time synchronization device and the network time synchronization interface are arranged at the first security area end;

the network shutdown and network time tick interfaces are arranged at the first safety zone end, the second safety zone end and the third safety zone end;

safety isolation equipment is arranged between the first safety area and the second safety area and between the first safety area and the third safety area;

the clock source is provided with a satellite positioning and time setting device and is used for receiving satellite positioning signals and acquiring standard time signals; the clock source is connected with the network shutdown machine of the first safety area end through the network time setting interface; the network shutdown port of the first safety zone end is respectively connected with the network shutdown device of the second safety zone end and the network shutdown device of the third safety zone end through safety isolation equipment;

the network time tick interface is used for outputting a time signal.

Furthermore, the satellite positioning time synchronization device is a GPS or Beidou satellite signal positioning time synchronization device.

Further, the internet access device is configured to obtain a standard time signal, and send the time signal to the second security zone end and the third security zone end. The I area time synchronization gateway function comprises the steps that a standard time signal output by the satellite positioning time synchronization device is obtained in the I area, and the standard time signal is sent to the gateway machine positioned at the end II of the safety area and the end III of the safety area after format conversion. The network shutdown machine of the end II and the end III of the safety area receives the standard time signal transmitted by the network shutdown machine of the end I of the safety area, sets the standard time signal as local time, sets the local machine as a unique time synchronization device of the safety area, and transmits the standard time signal to the user host equipment of the safety area.

The clock source arranged in the safety area I receives satellite positioning and time synchronization signals, the satellite positioning and time synchronization device adopts a GPS or Beidou satellite positioning and time synchronization device, and the main clock is provided with at least two paths of network time synchronization interfaces for performing network time synchronization on the equipment in the area. Each safety area is provided with a network switch, which is connected with a clock source in a safety area I network, directly collects the standard time of the clock source, converts the standard time into a time mark data format of a time synchronization system, and sends the time mark data format to the safety areas II and III. And the network shutdown machine of the safe area II, namely the large production area end receives the time scale data transmitted by the network shutdown machine of the safe area I through the fireproof line as a clock source, and the network shutdown machine transmits the time scale data to each host machine through the network time setting interface to complete time setting. And the network shutdown machine receives the time scale data transmitted by the network shutdown machine in the safety area I as a clock source, and the network shutdown machine sends the time scale data to each host machine through the network time synchronization interface to complete time synchronization.

The safety isolation device is a one-way physical isolation device and is used for transmitting standard time signals from the first safety zone to the safety zones II and III. The unidirectional physical isolation equipment is hardware with a communication transmission control function, link layer connection between networks is cut off on a circuit, unidirectional data transmission can be carried out between the networks with different security levels, even if data can only be transmitted from the security zone I to the security zones II and III, the unidirectional physical isolation equipment has the characteristics of high data transmission rate, safety and reliability. Safety protection equipment such as a firewall is connected between the network switches of the first end of the safety zone and the second end of the safety zone, and between the first end of the safety zone and the third end of the safety zone, so that the first area of the safety zone and the second area of the safety zone, and the first area of the safety zone are isolated, and data can only be transmitted from the first area of the safety zone to the outside through one-way network information.

As shown in fig. 2, the Time synchronization device at the I end of the security area directly obtains the current standard Time conforming to the NTP protocol from the network shutdown machine, decodes and converts the current standard Time into a shorter Time scale format (e.g., the CP56Time2a standard format with 7 bytes specified in the IEC60870-5 protocol), and transmits the Time scale format to the network shutdown machine at the II end of the security area and the III end of the security area through unidirectional network transmission (e.g., UDP). The gateway machine positioned at the end of the safety area II and the end of the safety area III receives the data, decodes the data and sets the decoded data as standard time on a host connected with the network time synchronization interface to finish the homologous time synchronization. The communication network closedown of each safety zone of the whole plant realizes the unification of the communication network closedown and the time source, and then carries out timing network multicast on the current synchronized time data in a local area network segment corresponding to the zone at every minute, so that each system host in each zone can obtain standard time so as to carry out unified time synchronization. The system host in each area can also use the network time-tick interface to time tick with the local area network.

The invention can realize the time mark data transmission under the condition that the data can only transmit the network information from the safety area I to the outside in a one-way, and simultaneously realize the unification and synchronization of the time mark data, thereby synchronizing the time of the user host equipment of the total station with the time of the safety area where the clock source is positioned, realizing the time shaft alignment of the whole area and having strong real-time data transmission.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.