CN113013852B - A method and device for processing line protection fiber channel transmission data - Google Patents

Abstract

The invention discloses a method and a device for processing transmission data of a line protection optical fiber channel, which comprises the following steps: acquiring a data frame format value in a communication message sent by the opposite side; when the numerical value is a first preset numerical value, the devices on the two sides of the optical fiber channel regularly transmit sampling data and switching value data after sampling is interrupted; when the numerical value is a second preset numerical value, sending the sampling data and the sampling sequence number of the previous frame with abnormal verification and the sampling data of the current frame to the opposite side; when the value is a third preset value, carrying out phasor calculation on the sampling data of 1/4 cycle before the abnormal frame, sending the real part and the imaginary part of the three-phase current and the corresponding sampling serial number to the opposite side, and using current phasor of 1/4 cycle of current on the same side and the opposite side the differential current and the braking current for differential protection are synthesized. By sending sampling data after sampling interruption, when 2 times of continuous data abnormality is detected, phasor is calculated by using a short window algorithm and transmitted to the opposite side, so that the influence of accidental communication abnormality of the optical fiber channel on differential protection is reduced.

Description

A method and device for processing line protection fiber channel transmission data

technical field

The present invention relates to the technical field of high-voltage transmission line protection, in particular to a method and device for processing data of line protection optical fiber channel transmission data.

Background technique

At this stage, the protection of high-voltage power grid transmission lines in my country has generally adopted the principle of optical fiber differential protection. Differential protection has the advantages of good selectivity and fast action speed, which plays an important role in protecting the security of the power grid.

However, in the process of on-site operation, due to electromagnetic interference and other reasons, the optical fiber communication may be abnormal and the differential protection may be blocked.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a method and device for processing data transmitted through a line protection fiber channel. In view of the situation of differential protection blocking after abnormal fiber channel data, by sending sampling points after each sampling interruption, and detecting When the data is abnormal, the short-window algorithm is used to calculate the phasor and transmit it to the opposite side, so as to reduce the impact of the occasional communication abnormality of the Fibre Channel on the differential protection.

In order to solve the above technical problem, a first aspect of the embodiments of the present invention provides a method for processing line protection fiber channel transmission data, including the following steps:

Obtain the value of the data frame format in the communication message of the opposite side through the Fibre Channel;

When the value of the data frame format is the first preset value, the devices on both sides of the optical fiber channel regularly send sampling data and switching data after each sampling interruption, and use the sampling data on the local side and the opposite side to receive the sampling data. Synthesized differential current and braking current;

When the value of the data frame format is the second preset value, the sampled data and the sampling serial number of the previous frame with abnormal verification and all the data of the current frame are converted by several preset first data bits of the sampled data. The sampled data is sent to the opposite side, and the devices on both sides of the fiber channel synthesize the differential current and the braking current for differential protection using the sampled data on the current side and the opposite side;

When the value of the data frame format is the third preset value, phasor calculation is performed on the sampled data of the 1/4 cycle before the abnormal frame to obtain the real part and imaginary part of the three-phase current, and the Several preset first data bits and several preset second data bits of the data send the real part and imaginary part of the three-phase current and the corresponding sampling sequence number to the opposite side, and the devices on both sides of the fiber channel use The 1/4 cycle current phasor of the current side and the opposite side is used to synthesize the differential current and braking current for differential protection.

Further, after obtaining the value of the data frame format in the sampling data on the opposite side through the optical fiber channel, the method further includes:

Obtain the value in the data frame format;

Judging whether the value of the data frame format is the third preset value;

When the value of the data frame format is the third preset value, obtain the short-window current phasor transmitted by the opposite side and the current phasor of the local side to synthesize the differential current and the braking current, and the first preset value is obtained. The short window is used to complete the differential protection function within the duration;

And after the first preset time period, when the sampled data is always normal, it is switched to use the opposite-side sampled data and the local-side sampled data to calculate the differential current and the braking current, so as to complete the differential protection.

Further, the phasor calculation is performed on the sampled data of the 1/4 cycle before the abnormal frame, including:

Set the number of sampling points per sampling period to N;

For the short window data of the first preset duration, the real part of the three-phase current is:

And, the imaginary part of the three-phase current is:

Among them, x _l represents the l-th sampling point of the input signal;

Then, the calculation formula of the phasor sent to the opposite side is:

Further, before obtaining the value of the data frame format in the sampling data on the opposite side through the optical fiber channel, the method further includes:

performing a CRC check on the sampled data received through the Fibre Channel;

When there is no error in the CRC check, the data frame format value is set to the first preset value;

When the CRC check includes a single error, setting the data frame format value to the second preset value;

When the CRC check includes two consecutive errors, the data frame format value is set to the third preset value.

Further, the method for processing line protection Fibre Channel transmission data further includes:

When the CRC check includes three consecutive errors, the differential protection is blocked.

Correspondingly, a second aspect of the embodiments of the present invention provides a line protection fiber channel transmission data processing device, including:

a first obtaining module, which is used to obtain the numerical value of the data frame format in the communication message of the opposite side through the Fibre Channel;

The first control module is used to send sampling data and switching data regularly after each sampling interruption when the value of the data frame format is the first preset value, and use this Synthesize differential current and braking current by receiving the sampling data from the side and the opposite side;

The second control module is configured to, when the value of the data frame format is a second preset value, use a plurality of preset first data bits of the sampled data to check the abnormal sampling data of the previous frame and the sampling serial number and the sampling data of this frame are sent to the opposite side, and the devices on both sides of the fiber channel use the sampling data of this side and the opposite side to synthesize the differential current and braking current for differential protection;

The third control module is configured to perform phasor calculation on the sampled data of 1/4 cycle before the abnormal frame when the value of the data frame format is the third preset value, so as to obtain the actual value of the three-phase current. part and imaginary part, and send the real part and imaginary part of the three-phase current and the corresponding sampling sequence number to the opposite side through several preset first data bits and several preset second data bits of the data, The devices on both sides of the optical fiber channel utilize the 1/4-cycle current phasors received by the current side and the opposite side to synthesize the differential current and the braking current for differential protection.

Further, the line protection Fibre Channel transmission data processing device further includes:

A second acquisition module, which is used to acquire the numerical value of the data frame format;

a first judgment module, which is used for judging whether the value of the data frame format is the third preset value;

The fourth control module is used to obtain the short-window current phasor transmitted by the opposite side and the current phasor of the local side to synthesize the differential current and control when the value of the data frame format is the third preset value. Dynamic current, the short window is used to complete the differential protection function within the first preset time period;

The fifth control module is configured to switch to using the opposite-side sampling data and the local-side sampling data to calculate the differential current and the braking current when the sampling data is always normal after the first preset time period, so as to Complete differential protection.

Further, the third control module includes: a setting unit and a calculation unit;

The setting unit is used to set the number of sampling points in each sampling period to N;

The calculation unit is used to calculate the real part of the three-phase current for the short-window data of the first preset duration:

And, calculate the imaginary part of the three-phase current as:

Among them, x _l represents the l-th sampling point of the input signal;

and calculate the phasor sent to the opposite side as:

Further, the line protection Fibre Channel transmission data processing device further includes:

a data verification module, which is used to verify the sampled data received through the Fibre Channel;

A setting module, which is used for setting the format value of the data frame to the first preset value when the CRC check has no errors, and is also used for setting the data frame when the CRC check includes a single error The format value is set to the second preset value, and is further configured to set the data frame format value to the third preset value when the CRC check includes two consecutive errors.

Further, the line protection Fibre Channel transmission data processing device further includes:

A sixth control module, configured to block the differential protection when the CRC check includes three consecutive errors.

Correspondingly, a third aspect of the embodiments of the present invention provides an electronic device, including: at least one processor; and a memory connected to the at least one processor; wherein, the memory stores data that can be processed by the one processor The instructions are executed by the processor, and the instructions are executed by the one processor, so that the at least one processor executes the above-mentioned method for processing line protection Fibre Channel transmission data.

In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, implement the above line protection fiber channel transmission data processing method.

The above-mentioned technical solutions of the embodiments of the present invention have the following beneficial technical effects:

In view of the situation that the differential protection is blocked after the abnormal data of the fiber channel, the sampling point is sent after each sampling interruption, and when the abnormal data is detected, the short-window algorithm is used to calculate the phasor and transmit it to the opposite side, so as to reduce the loss of the fiber channel. The impact of occasional communication anomalies on differential protection.

Description of drawings

1 is a schematic diagram of the protection of a high-voltage transmission line provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a method for processing line protection Fibre Channel transmission data provided by an embodiment of the present invention;

3 is a logic diagram of a method for processing data for line protection fiber channel transmission provided by an embodiment of the present invention;

FIG. 4a is a schematic diagram of a data frame when Fibre Channel sampling data is normal according to an embodiment of the present invention;

4b is a schematic diagram of a data frame when the sampling data of the Fibre Channel provided by an embodiment of the present invention is abnormal;

FIG. 4c is a schematic diagram of a data frame when Fibre Channel sampling data is continuously abnormal according to an embodiment of the present invention;

FIG. 5 is a block diagram of a module of a line protection Fibre Channel transmission data processing device provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a third control module provided by an embodiment of the present invention.

Reference number:

1. The first acquisition module, 2. The first control module, 3. The second control module, 4. The third control module, 41. The setting unit, 42, The calculation unit, 5. The second acquisition module, 6. The first Judgment module, 7, fourth control module, 8, fifth control module, 9, sixth control module, 10, data verification module, 11, setting module.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

FIG. 1 is a schematic diagram of the protection of a high-voltage transmission line provided by an embodiment of the present invention.

FIG. 2 is a flowchart of a method for processing data transmitted over a line protection fiber channel provided by an embodiment of the present invention.

FIG. 3 is a logic diagram of a method for processing data transmitted over a line protection fiber channel provided by an embodiment of the present invention.

FIG. 4a is a schematic diagram of a data frame when sampling data of a fiber channel according to an embodiment of the present invention is normal.

FIG. 4b is a schematic diagram of a data frame when sampling data of an optical fiber channel is abnormal according to an embodiment of the present invention.

FIG. 4c is a schematic diagram of a data frame when Fibre Channel sampling data is continuously abnormal according to an embodiment of the present invention.

Please refer to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 a , FIG. 4 b and FIG. 4 c , a first aspect of the embodiments of the present invention provides a method for processing data transmitted through a line protection fiber channel, including the following steps:

S200. Obtain the value of the data frame format in the communication packet of the opposite side through the fiber channel.

S300, when the value of the data frame format is the first preset value, the devices on both sides of the optical fiber channel regularly send sampling data and switching data after each sampling interruption, and synthesize the differential by using the sampling data received from the local side and the opposite side. current and braking current.

Specifically, when the sampled data is normal, the data frame format is as shown in Figure 4a.

S400, when the value of the data frame format is the second preset value, send the sampled data and the sampled serial number of the previous frame with abnormal verification and the sampled data of the current frame to a pair of The devices on both sides of the fiber channel use the sampling data of the current side and the opposite side to synthesize the differential current and braking current for differential protection.

Specifically, when the value of the data frame format is the second preset value, when the data frame is sent, the switching quantities 1-3 are no longer transmitted in the data frame, and the 6 bytes of the switching quantities 1-3 are used to convert the The sampling data and sampling sequence number of the previous frame with abnormal verification and the new sampling data of this time are sent to the opposite side at the same time.

S500, when the value of the data frame format is the third preset value, perform phasor calculation on the sampled data of the 1/4 cycle before the abnormal frame to obtain the real part and the imaginary part of the three-phase current, and pass several A preset first data bit and a number of preset second data bits send the real part and imaginary part of the three-phase current and the corresponding sampling sequence number to the opposite side, and the devices on both sides of the fiber channel use 1/4 of the current side and the opposite side The current phasor of the cycle is used to synthesize the differential current and the braking current for the differential protection.

Specifically, when the value of the data frame format is the second preset value, when the data frame is sent, the switching quantities 1-6 are no longer transmitted in the data frame, and the sampling point of the 1/4 cycle before the abnormal frame is used to Perform phasor calculation, and send the calculated real and imaginary parts of the three-phase current and the corresponding sampling number to the opposite side.

Specifically, after the above process is completed, the acquisition of the value of the data frame format in the sampling data of the opposite side through the optical fiber channel is completed, and the step further includes:

S610, obtain the numerical value in a data frame format.

S620. Determine whether the value in the data frame format is a third preset value.

S630, when the value in the data frame format is a third preset value, obtain the short-window current phasor transmitted on the opposite side and the current phasor on the local side to synthesize the differential current and the braking current, and use both within the first preset duration The short window completes the differential protection function.

S640, and after the first preset time period, when the sampled data is always normal, switching to using the opposite-side sampled data and the local-side sampled data to calculate the differential current and the braking current to complete the differential protection.

Optionally, the value of the first preset duration is 10ms.

Specifically, in step S400, phasor calculation is performed on the sampled data of the 1/4 cycle before the abnormal frame, which specifically includes:

S510, the number of sampling points in each sampling period is set as N.

S520, for the short window data of the first preset duration, the real part of the three-phase current is:

And, the imaginary part of the three-phase current is:

Among them, x _l represents the l-th sampling point of the input signal;

Then, the calculation formula of the phasor sent to the opposite side is:

In addition, in step S200, before acquiring the value of the data frame format in the sampling data on the opposite side through the fiber channel, the method further includes:

S110, perform CRC check on the sampled data received through the fiber channel.

S120, when there is no error in the CRC check, set the data frame format value to a first preset value.

Optionally, the value of the first preset value is 0.

S130, when the CRC check includes a single error, set the data frame format value to a second preset value.

Optionally, the value of the second preset value is 1.

S140, when the CRC check includes two consecutive errors, set the data frame format value to a third preset value.

Optionally, the value of the third preset value is 2.

Further, after step S140, the following steps are also included:

S150, when the CRC check includes three consecutive errors, the differential protection is blocked.

FIG. 5 is a block diagram of a module of an apparatus for processing data for line protection fiber channel transmission provided by an embodiment of the present invention.

Correspondingly, referring to FIG. 5 , a second aspect of the embodiments of the present invention provides a line protection fiber channel transmission data processing device, including: a first acquisition module 1 , a first control module 2 , a second control module 3 , and a first Three control modules 4 . Wherein, the first acquisition module 1 is used for acquiring the value of the data frame format in the communication message of the opposite side through the fiber channel; the first control module 2 is used for when the value of the data frame format is the first preset value, the fiber channel two Both side devices regularly send sampling data and switching data after each sampling interruption, and synthesize differential current and braking current by using the sampling data of this side and the opposite side received; the second control module 3 is used when the data frame format is When the value is the second preset value, the sampling data and sampling sequence number of the previous frame with abnormal verification and the sampling data of this frame are sent to the opposite side, the devices on both sides of the fiber channel through several preset first data bits of the sampling data. The differential current and braking current used for differential protection are synthesized by using the sampling data of the current side and the opposite side; the third control module 4 is used for, when the value of the data frame format is the third preset value, The phasor calculation is performed on the sampled data of 1/4 cycle to obtain the real part and imaginary part of the three-phase current, and the three-phase current is calculated by several preset first data bits and several preset second data bits of the data. The real part, the imaginary part and the corresponding sampling number are sent to the opposite side. The devices on both sides of the fiber channel use the current phasors of 1/4 cycle received on the local and opposite sides to synthesize the differential current and braking for differential protection. current.

Specifically, the line protection fiber channel transmission data processing device further includes: a second acquisition module 5 , a first judgment module 6 , a fourth control module 7 and a fifth control module 8 . Wherein, the second obtaining module 5 is used to obtain the numerical value of the data frame format; the first judgment module 6 is used to judge whether the numerical value of the data frame format is the third preset value; the fourth control module 7 is used to obtain the numerical value of the data frame format When the value is the third preset value, obtain the short-window current phasor transmitted on the opposite side and the current phasor on the local side to synthesize the differential current and braking current, and use the short-window to complete the differential protection function within the first preset duration; The fifth control module 8 is configured to switch to calculate the differential current and the braking current by using the opposite-side sampling data and the local-side sampling data to complete the differential protection when the sampling data is always normal after the first preset time period.

FIG. 6 is a schematic diagram of a third control module provided by an embodiment of the present invention.

Specifically, please refer to FIG. 6 , the third control module 4 includes: a setting unit 41 and a calculation unit 42 . Wherein, the setting unit 41 is used to set the number of sampling points of each sampling period to N; the calculation unit 42 is used to calculate the real part of the three-phase current for the short window data of the first preset duration:

And, the imaginary part of the three-phase current is calculated as:

Among them, x _l represents the l-th sampling point of the input signal;

And calculate the phasor sent to the opposite side as:

Further, the line protection fiber channel transmission data processing device further includes: a data verification module 10 and a setting module 11 . Wherein, the data verification module 10 is used to verify the sampled data received through the fiber channel; the setting module 11 is used to set the data frame format value to the first preset value when the CRC verification is error-free, and also use When the CRC check includes a single error, the data frame format value is set to a second preset value, and when the CRC check includes two consecutive errors, the data frame format value is set to a third preset value.

The line protection optical fiber channel transmission data processing device further includes: a sixth control module 9, which is configured to block the differential protection when the CRC check includes three consecutive errors.

Correspondingly, a third aspect of the embodiments of the present invention provides an electronic device, including: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by one processor, and the instructions Executed by one processor, so that at least one processor executes the above-mentioned method for processing line protection Fibre Channel transmission data.

In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, implement the above line protection fiber channel transmission data processing method.

The embodiments of the present invention are intended to protect a method and device for processing data transmitted through a line protection fiber channel, wherein the method includes the following steps: obtaining the value of the data frame format in the communication message on the opposite side through the fiber channel; when the value of the data frame format is When the first preset value is used, the devices on both sides of the fiber channel send sampling data and switching data regularly after each sampling interruption, and synthesize the differential current and braking current by using the sampling data received from the current side and the opposite side; When the value of the format is the second preset value, the sampling data and sampling sequence number of the previous frame with abnormal verification and the sampling data of this frame are sent to the opposite side through several preset first data bits of the sampling data. The side device uses the sampling data of the current side and the opposite side to synthesize the differential current and braking current for differential protection; when the value of the data frame format is the third preset value, the 1/4 cycle before the abnormal frame The sampled data is calculated by phasor to obtain the real part and imaginary part of the three-phase current, and the real part and imaginary part of the three-phase current are calculated by several preset first data bits and several preset second data bits of the data. and the corresponding sampling serial number is sent to the opposite side. The devices on both sides of the fiber channel synthesize the differential current and braking current for differential protection by using the current phasor of the current side and the opposite side 1/4 cycle. The above technical solution has the following effects:

In view of the situation that the differential protection is blocked after the abnormal data of the fiber channel, the sampling point is sent after each sampling interruption, and when the abnormal data is detected, the short-window algorithm is used to calculate the phasor and transmit it to the opposite side, so as to reduce the loss of the fiber channel. The impact of occasional communication anomalies on differential protection.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications or equivalent replacements are made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (6)

1. A method for processing line protection Fibre Channel transmission data, comprising the steps of: Obtain the value of the data frame format in the communication message of the opposite side through the Fibre Channel; When the value of the data frame format is the first preset value, the devices on both sides of the optical fiber channel regularly send sampling data and switching data after each sampling interruption, and combine the sampling data received from the local side and the opposite side. Differential current and braking current; When the value of the data frame format is the second preset value, the sampled data and the sampling serial number of the previous frame with abnormal verification and all the data of the current frame are converted by several preset first data bits of the sampled data. The sampled data is sent to the opposite side, and the devices on both sides of the fiber channel synthesize the differential current and the braking current for differential protection using the sampled data on the current side and the opposite side; When the value of the data frame format is the third preset value, phasor calculation is performed on the sampled data of the 1/4 cycle before the abnormal frame to obtain the real part and imaginary part of the three-phase current, and the Several preset first data bits and several preset second data bits of the data send the real part and imaginary part of the three-phase current and the corresponding sampling sequence number to the opposite side, and the devices on both sides of the fiber channel use The 1/4 cycle current phasor of the current side and the opposite side is used to synthesize the differential current and braking current for differential protection; After obtaining the value of the data frame format in the communication message of the opposite side through the fiber channel, the method further includes: Obtain the value of the data frame format; determine whether the value of the data frame format is the third preset value; when the value of the data frame format is the third preset value, obtain the data transmitted by the opposite side. The short window current phasor and the local current phasor synthesize the differential current and the braking current, and the short window is used to complete the differential protection function within the first preset time period; and after the first preset time period, when all the When the sampling data is always normal, switch to use the sampling data of the opposite side and the sampling data of the local side to calculate the differential current and braking current to complete the differential protection; Wherein, the phasor calculation is performed on the sampling data of the 1/4 cycle before the abnormal frame, including: Set the number of sampling points per sampling period to N; For the short window data of the first preset duration, the real part of the three-phase current is:

And, the imaginary part of the three-phase current is:

Among them, x _l represents the l-th sampling point of the input signal; Then, the calculation formula of the phasor sent to the opposite side is:

2 . The method for processing line protection Fibre Channel transmission data according to claim 1 , wherein before acquiring the value of the data frame format in the sampling data on the opposite side through the Fibre Channel, the method further comprises: 2 . performing a CRC check on the sampled data received through the Fibre Channel; When there is no error in the CRC check, the data frame format value is set to the first preset value; When the CRC check includes a single error, setting the data frame format value to the second preset value; When the CRC check includes two consecutive errors, the data frame format value is set to the third preset value. 3. The method for processing line protection Fibre Channel transmission data according to claim 2, further comprising: When the CRC check includes three consecutive errors, the differential protection is blocked. 4. A line protection Fibre Channel transmission data processing device, comprising: a first obtaining module, which is used to obtain the numerical value of the data frame format in the communication message of the opposite side through the Fibre Channel; The first control module is used to send sampling data and switching data regularly after each sampling interruption when the value of the data frame format is the first preset value, and use this Synthesize differential current and braking current by receiving the sampling data from the side and the opposite side; The second control module is configured to, when the value of the data frame format is a second preset value, use a plurality of preset first data bits of the sampled data to check the abnormal sampling data of the previous frame and the sampling serial number and the sampling data of this frame are sent to the opposite side, and the devices on both sides of the fiber channel use the sampling data of this side and the opposite side to synthesize the differential current and braking current for differential protection; The third control module is configured to perform phasor calculation on the sampled data of 1/4 cycle before the abnormal frame when the value of the data frame format is the third preset value, so as to obtain the actual value of the three-phase current. part and imaginary part, and send the real part and imaginary part of the three-phase current and the corresponding sampling sequence number to the opposite side through several preset first data bits and several preset second data bits of the data, The devices on both sides of the optical fiber channel synthesize the differential current and the braking current for differential protection by using the current phasor of the 1/4 cycle received by the current side and the opposite side; Also includes: A second acquisition module, which is used to acquire the numerical value of the data frame format; a first judgment module, which is used for judging whether the value of the data frame format is the third preset value; the fourth control module, which is used to obtain the short-window current phasor transmitted by the opposite side and the current phasor of the local side to synthesize the differential current and the braking current when the value of the data frame format is the third preset value , the short window is used to complete the differential protection function within the first preset duration; The fifth control module is configured to switch to using the opposite-side sampling data and the local-side sampling data to calculate the differential current and the braking current when the sampling data is always normal after the first preset time period, so as to Complete differential protection; The third control module includes: a setting unit and a computing unit; The setting unit is used to set the number of sampling points in each sampling period to N; The calculation unit is used to calculate the real part of the three-phase current for the short-window data of the first preset duration:

And, the imaginary part of the three-phase current is calculated as:

Among them, x _l represents the l-th sampling point of the input signal; and calculate the phasor sent to the opposite side as:

5. The line protection Fibre Channel transmission data processing device according to claim 4, further comprising: a data verification module, configured to verify the sampled data received through the fiber channel; A setting module, which is used for setting the format value of the data frame to the first preset value when the CRC check has no errors, and is also used for setting the data frame when the CRC check includes a single error The format value is set to the second preset value, and is further configured to set the data frame format value to the third preset value when the CRC check includes two consecutive errors. 6. The line protection Fibre Channel transmission data processing device according to claim 5, further comprising: A sixth control module, configured to block differential protection when the CRC check includes three consecutive errors.

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