阅读说明：本技术 一种智能变电站过程层网络链路状态监视方法 (Intelligent substation process layer network link state monitoring method ) 是由 张弛 杨贵 徐鹏 吕航 彭业 李力 陈旭 叶翔 刘千宽 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种智能变电站过程层网络链路状态监视方法,通过光纤直接相连的两个设备端口的收发光功率的差值判断光纤衰减是否在合理范围内,当衰减超过设置的门槛值时给出告警,提示运维人员进行相应处理；通过对SFP模块发送光功率的标称值与实际发光功率进行比较,判断发送光功率是否正常,当发送功率不在标称范围内时给出告警,提示运维人员进行相应处理；通过端口设置的接收功率门限值与实际接收光功率进行比较,判断接收光功率是否正常,接收功率不在标称范围内时给出告警,提示运维人员进行相应处理。本发明提升了智能变电站过程层网络的运维管理水平,符合智能变电站全网监视的发展趋势。(The invention discloses a monitoring method for the link state of a process layer network of an intelligent substation, which judges whether the attenuation of an optical fiber is in a reasonable range or not through the difference value of the receiving and transmitting optical powers of two equipment ports directly connected with the optical fiber, gives an alarm when the attenuation exceeds a set threshold value, and prompts operation and maintenance personnel to perform corresponding processing; comparing the nominal value of the optical power transmitted by the SFP module with the actual luminous power, judging whether the transmitted optical power is normal or not, giving an alarm when the transmitted power is not in the nominal range, and prompting operation and maintenance personnel to perform corresponding treatment; and comparing the received power threshold value set by the port with the actual received optical power, judging whether the received optical power is normal, giving an alarm when the received power is not in the nominal range, and prompting operation and maintenance personnel to perform corresponding processing. The invention improves the operation and maintenance management level of the process layer network of the intelligent substation and accords with the development trend of the whole network monitoring of the intelligent substation.)

1. A method for monitoring the link state of a process level network of an intelligent substation is characterized by comprising the following steps:

judging whether the sending power and the receiving power of the SFP modules of two ports directly connected by the optical fiber in the process level network of the intelligent substation are in a specified range or not;

if so, calculating the difference value between the sending power of the SFP module of the port at the side and the receiving power of the SFP module of the port at the opposite side as an optical fiber link attenuation value, and judging whether the difference value is in the specified range of the optical fiber link attenuation value;

if so, calculating the difference value between the transmitting power of the SFP module of the opposite port and the receiving power of the SFP module of the local port as an optical fiber link attenuation value, and judging whether the difference value is in the specified range of the optical fiber link attenuation value;

and sending out an alarm by the transmission power, the receiving power and the optical fiber link attenuation value which exceed the specified range.

2. The intelligent substation process level network link state monitoring method of claim 1,

if the IED equipment realizes interconnection and intercommunication through switch networking, two ports of optical fiber direct connection in the intelligent substation process level network include: a central switch port and an inter-bay switch port, and an inter-bay switch port and an IED device port;

if the IED equipment is directly connected with the optical fiber, the two ports of the optical fiber direct connection in the process level network of the intelligent substation comprise: merging unit port and protection device port, merging unit port and measurement and control device port, intelligent terminal port and protection device port, and intelligent terminal port and measurement and control device port.

3. The method for monitoring the link state of the process layer network of the intelligent substation according to claim 1, wherein the specified range and the specified range of the optical fiber link attenuation value are sent to the monitoring host by port equipment or are configured in the monitoring host.

4. The method for monitoring the state of the process layer network link of the intelligent substation according to claim 1, wherein the specified range of the transmission power of the SFP module adopts a nominal transmission optical power range of the SFP optical module, or an upper limit value and a lower limit value are set manually.

5. The method for monitoring the state of the process level network link of the intelligent substation according to claim 1, wherein the specified range of the received power of the SFP module adopts a nominal receiving sensitivity value of the SFP optical module, or a dynamic specified range of the received power is set by the following formula:

a specified range of transmission power- (fiber attenuation + total attenuation of fiber splice + total attenuation of fused fiber + margin value).

6. The intelligent substation process level network link state monitoring method of claim 1, wherein the specified range of the optical fiber link attenuation value is not less than a nominal value of receive sensitivity provided by an SFP optical module manual.

7. The intelligent substation process level network link state monitoring method of claim 1, wherein the specified range of optical fiber link attenuation values is determined using the following formula:

the fiber attenuation + the total attenuation of the fiber splice + the total attenuation of the fused fiber + the margin value.

8. The intelligent substation process level network link state monitoring method of claim 1, wherein the alarm comprises: time scale, alarm event, alarm port and relevant IED equipment information;

the alarm event comprises the specific content that the attenuation of the optical fiber link is too large, the sending power of the SFP module is out of limit or the receiving power of the SFP module is out of limit.

Technical Field

The invention belongs to the technical field of network communication of intelligent substations, and particularly relates to a method for monitoring a process level network link state of an intelligent substation.

Background

Two-way or two-way SFP (Small Form-factor plug) module of single core is adopted between the process level network equipment of the intelligent transformer substation to realize communication through optical fiber. When IED (Intelligent Electronic Device) devices have a direct connection relationship, the two IED devices respectively provide an optical fiber interface, and the devices communicate with each other through optical fibers. When a switch networking is used, the communication between one port of the IED device and one port of the switch is also realized by using optical fibers, and the communication between the switches is also realized.

The IED equipment connected with the process level network of the current intelligent substation informs the current operation condition of operation and maintenance personnel through the connection state of an uploading port and the receiving conditions of SV and GOOSE messages, and the switch can only inform the current operation condition of the operation and maintenance personnel through the connection state of the uploading port, the number of lost frames of the port and other information, and cannot accurately inform the specific position of the fault of the operation and maintenance personnel. Therefore, it is difficult to efficiently determine a failure of an optical fiber link, a failure of an SFP module, or the like, and to troubleshoot the failure. When the optical fiber link or the SFP module gradually descends to cause the early warning functions such as operation risk, etc., the early warning functions cannot be realized at present. The problem can be found only after the fault occurs, and the problem is solved without an effective means, so that the operation and maintenance are difficult.

Disclosure of Invention

The invention aims to provide a method for monitoring the state of a process layer network link of an intelligent substation, which can provide early warning information before a fault occurs, can accurately position the fault, reduce the workload of operation and maintenance and improve the maintenance efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that:

a monitoring method for the link state of a process level network of an intelligent substation comprises the following steps:

judging whether the sending power and the receiving power of the SFP modules of two ports directly connected by the optical fiber in the process level network of the intelligent substation are in a specified range or not;

if so, calculating the difference value between the sending power of the SFP module of the port at the side and the receiving power of the SFP module of the port at the opposite side as an optical fiber link attenuation value, and judging whether the difference value is in the specified range of the optical fiber link attenuation value;

if so, calculating the difference value between the transmitting power of the SFP module of the opposite port and the receiving power of the SFP module of the local port as an optical fiber link attenuation value, and judging whether the difference value is in the specified range of the optical fiber link attenuation value;

and sending out an alarm by the transmission power, the receiving power and the optical fiber link attenuation value which exceed the specified range.

Further, in the above-mentioned case,

if the IED equipment realizes interconnection and intercommunication through switch networking, two ports of optical fiber direct connection in the intelligent substation process level network include: a central switch port and an inter-bay switch port, and an inter-bay switch port and an IED device port;

if the IED equipment is directly connected with the optical fiber, the two ports of the optical fiber direct connection in the process level network of the intelligent substation comprise: merging unit port and protection device port, merging unit port and measurement and control device port, intelligent terminal port and protection device port, and intelligent terminal port and measurement and control device port.

Further, the specified range and the specified range of the attenuation value of the optical fiber link are sent to the monitoring host by using port equipment, or are configured in the monitoring host.

Further, the specified range of the SFP module transmission power adopts a nominal transmission optical power range of the SFP optical module, or upper and lower limit values are set manually.

Further, the specified range of the SFP module received power adopts a nominal receive sensitivity value of the SFP optical module, or a dynamic specified range of the received power is set by the following formula:

a specified range of transmission power- (fiber attenuation + total attenuation of fiber splice + total attenuation of fused fiber + margin value).

Furthermore, the specified range of the attenuation value of the optical fiber link is not less than the nominal value of the receiving sensitivity provided by the SFP optical module manual.

Further, the specified range of the attenuation value of the optical fiber link is determined by the following formula:

the fiber attenuation + the total attenuation of the fiber splice + the total attenuation of the fused fiber + the margin value.

Further, the alarm includes: time scale, alarm event, alarm port and relevant IED equipment information;

the alarm event comprises the specific content that the attenuation of the optical fiber link is too large, the sending power of the SFP module is out of limit or the receiving power of the SFP module is out of limit.

The invention has the beneficial effects that:

according to the invention, by using the out-of-limit judgment of the transmitting power and the receiving power of the SFP module of the process-level IED equipment and the exchanger and the judgment of the attenuation range of the optical fiber line, the fault early warning and the fault alarm of the physical optical fiber link are realized, the purpose of accurately positioning the fault is achieved, the operation and maintenance workload is effectively reduced, and the operation and maintenance efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of IED devices of an intelligent substation process level network link state monitoring method connected through a switch network;

fig. 2 is a schematic diagram of direct interconnection of IED devices through optical fibers in the method for monitoring the link state of the process level network of the intelligent substation.

Detailed Description

The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

When the IED device is used to implement interconnection through the switch networking, as shown in the connection mode of fig. 1, the SFP module of port 1 of the central switch and the SFP module of port G1 of the inter-bay switch are connected and communicated by using an optical fiber, the central switch sends information of the transmission power and the reception power of the SFP module of port 1 to the monitoring host, and the inter-bay switch sends information of the transmission power and the reception power of the SFP module of port G1 to the monitoring host. The monitoring host machine completes the following work:

(11) and judging whether the respective SFP modules of the central switch port 1 and the interval switch port G1 have the transmission power and the receiving power within the specified range, if so, carrying out the next calculation, and if not, giving an alarm.

Further, the specified range may be sent to the monitoring host by the device, or may be configured in the monitoring host.

Further, the predetermined range of the transmission power value of the SFP module may use a nominal transmission optical power range of the SFP optical module, or may artificially set upper and lower limit values.

Further, the specified range of the receiving power value of the SFP module may use a nominal receiving sensitivity value of the SFP optical module, or may set a dynamic receiving specified range by the following formula:

a predetermined range of transmission power values- (fiber attenuation + total fiber splice attenuation + total fused fiber attenuation + margin value).

(12) And calculating the difference value between the sending power of the SFP module of the port 1 of the central switch and the receiving power of the SFP module of the port G1 of the interval switch as an optical fiber link attenuation value, judging whether the difference value is in a specified range, if so, performing the next calculation, and if not, giving an alarm.

Further, the specified range may be sent to the monitoring host by the device, or may be configured in the monitoring host.

Further, the specified range should be not less than the nominal value of the reception sensitivity provided by the SFP optical module manual, and is set by the following formula:

the fiber attenuation + the total attenuation of the fiber joint + the total attenuation of the fused fiber + the margin value,

the fiber attenuation can be calculated according to 1dBm, the attenuation of one fiber connector can be calculated according to 0.5dBm, and the margin value can be set according to 1 dBm-5 dBm.

(13) And calculating the difference value of the transmitting power of the SFP module of the interval switch port G1 and the receiving power of the SFP module of the central switch port 1 as an optical fiber link attenuation value. And judging whether the difference value is within a specified range, if so, judging that the working state of the optical fiber link is normal, and if not, giving an alarm.

(14) And giving an alarm to prompt operation and maintenance personnel to perform corresponding treatment by the transmitting power, the receiving power and the optical fiber link attenuation value which exceed the specified range.

Further, the judgment of the working state of the optical fiber link, the overrun of the sending power of the SFP module and the overrun of the receiving power of the SFP module can be realized on the IED settings of mutual communication and abnormal alarm generation, and can also be realized on the monitoring host, the IED equipment sends corresponding information to the monitoring host, and the monitoring host performs corresponding calculation and judgment and generates alarm.

Further, the alarm information should include: and the time scale comprises specific alarm events, alarm ports, relevant IED equipment information and the like, wherein the specific alarm events comprise excessive attenuation of an optical fiber link, an SFP module transmission power out-of-limit, an SFP module receiving power out-of-limit and the like.

Similarly, the IED devices accessed by the switches are processed in the same manner. It should be noted that the calculation must be performed by using the sending end and the receiving end of two ports directly connected by one optical fiber. Otherwise unpredictable error structures will result.

Example 2

When a networking scheme of direct optical fiber connection between IED devices is adopted, as shown in fig. 2, the merging unit is respectively connected with the protection device and the measurement and control device through optical fibers. The intelligent terminal is respectively connected with the protection equipment and the measurement and control equipment through optical fibers. Therefore, the merging unit, the intelligent terminal, the protection device and the measurement and control device complete the networking, and each device needs to provide 2 optical fiber interfaces. That is, each device needs to configure 2 SFP single-fiber bidirectional or dual-fiber bidirectional SFP hundred mega modules.

Selecting an optical fiber link directly connected with the merging unit and the protection device for analysis, uploading the state information of the SFP module of the port connected with the protection device to the protection device by the merging unit for processing, directly reading the state information of the SFP module of the port connected with the merging unit by the protection device, and finishing the following work by the protection device:

(21) and judging whether the sending power and the receiving power of the SFP module of the interconnection port of the merging unit and the protection equipment are in a specified range, if so, carrying out the next calculation, and if not, giving an alarm.

Further, the specified range may be sent to the monitoring host by the device, or may be configured in the monitoring host.

Further, the predetermined range of the transmission power value of the SFP module may use a nominal transmission optical power range of the SFP optical module, or may artificially set upper and lower limit values.

Further, the specified range of the receiving power value of the SFP module may use a nominal receiving sensitivity value of the SFP optical module, or may set a dynamic receiving specified range by the following formula:

a predetermined range of transmission power values- (fiber attenuation + total fiber splice attenuation + total fused fiber attenuation + margin value).

(22) And calculating the difference value between the transmitting power of the port of the merging unit connected with the protection device and the receiving power of the port of the merging unit connected with the protection device as an optical fiber link attenuation value, judging whether the difference value is within a specified range, if so, performing the next calculation, and if not, giving an alarm.

Further, the specified range may be sent to the monitoring host by the device, or may be configured in the monitoring host.

Further, the specified range should be no less than the nominal value of the receive sensitivity provided by the SFP optical module manual, and is generally determined using the following formula:

the fiber attenuation + the total attenuation of the fiber joint + the total attenuation of the fused fiber + the margin value,

the fiber attenuation can be calculated according to 1dBm, the attenuation of one fiber connector can be calculated according to 0.5dBm, and the margin value can be set according to 1 dBm-5 dBm.

(23) And calculating the difference value of the transmitting power of the port of the protection device connected with the merging unit and the receiving power of the port of the merging unit connected with the protection device as an optical fiber link attenuation value. And judging whether the difference value is within a specified range, if so, judging that the working state of the optical fiber link is normal, and if not, giving an alarm.

(24) And giving an alarm to prompt operation and maintenance personnel to perform corresponding treatment by the transmitting power, the receiving power and the optical fiber link attenuation value which exceed the specified range.

Similarly, the method for judging the optical fiber link between other devices directly connected by the optical fiber is the same as above. It should be noted that the calculation must be performed by using the sending end and the receiving end of two ports directly connected by one optical fiber, otherwise, an unpredictable error structure is generated.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.