CN112202520A - Longitudinal differential protection testing device based on 5G network time synchronization and application method thereof - Google Patents
Longitudinal differential protection testing device based on 5G network time synchronization and application method thereof Download PDFInfo
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Abstract
The invention discloses a pilot differential protection testing device based on 5G network time synchronization and an application method thereof, wherein the pilot differential protection testing device comprises a control terminal and at least two testers, the control terminal comprises a man-machine interaction module, a first control module, a first time marking module and a first 5G communication module, and the testers comprise a second 5G communication module, a second control module, a second time marking module and an interface function unit. The longitudinal differential protection testing device based on 5G network time synchronization can realize a plurality of remote synchronous testing systems, effectively reduce the number of testing devices, realize remote synchronous control of a plurality of devices to carry out longitudinal differential protection testing, provide a technical basis for a plurality of synchronous testing technologies of secondary equipment of an intelligent substation and a remote synchronous testing technology, simplify the testing system, reduce the number of devices used in the original testing system, reduce testing requirements, reduce the cost of testing personnel and improve the testing efficiency.
Description
Technical Field
The invention relates to a testing technology of secondary equipment of an intelligent substation, in particular to a pilot differential protection testing device based on 5G network time synchronization and an application method thereof.
Background
The ubiquitous power internet of things is an intelligent service system which is around each link of a power system, fully applies modern information technologies such as mobile interconnection, artificial intelligence and the like and advanced communication technologies to realize the mutual object interconnection and the man-machine interaction of each link of the power system, and has the characteristics of comprehensive state sensing, efficient information processing and convenient and flexible application. The national grid company starts the third-generation intelligent substation test point construction work in 2018, combines an intelligent station detection technology with an advanced information technology and a communication technology through the ubiquitous power internet of things, forms a high-efficiency intelligent secondary equipment maintenance method, improves operation and maintenance efficiency, provides a detection method for intelligent operation and maintenance, realizes data sharing, and provides basic-level technical support for three types of two networks.
With the application and development of the power internet of things technology, the high safety requirement of a power grid and the wide-coverage characteristic, the smart power grid must achieve 99.999% of high reliability in a measurement processing system with massive connection and wide coverage; the simultaneous access of an ultra-large number of terminal devices, the ultra-low time delay smaller than millisecond level, the deep coverage of a terminal, the stability of signals and the like are basic requirements for safe work of the terminal devices, and a mixed application technology of an electric power internet of things technology and a 5G communication technology can be implemented in a large number in an intelligent power grid.
Currently, only the longitudinal differential protection in a transformer substation adopts a multi-machine different-place synchronous test mode, as shown in fig. 1, the test method is as follows: the double-end synchronous test pilot differential protection needs to provide 2 testers, 2 GPS time synchronization devices and 2 tester control terminals; two testers are required to respectively enter two places, GPS equipment signal trigger time is agreed through telephone communication, the output of the tester is triggered at the same time, and voltage and current signals output by the tester guarantee that voltage and current are simultaneously applied to two protection devices at the same time (within a time error allowable range), so that a longitudinal differential protection test of synchronous output in different places is realized. However, it is obviously difficult to satisfy the requirement of accurate time synchronization in this manner.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a longitudinal differential protection testing device based on 5G network time synchronization and an application method thereof, the longitudinal differential protection testing device based on 5G network time synchronization can realize a plurality of remote synchronous testing systems, effectively reduces the number of testing devices, realizes remote synchronous control of a plurality of devices to carry out longitudinal differential protection testing, and provides a technical basis for a plurality of synchronous testing technologies of secondary equipment of an intelligent substation and a remote synchronous testing technology.
In order to solve the technical problems, the invention adopts the technical scheme that:
the control terminal comprises a man-machine interaction module, a first control module, a first time marking module and a first 5G communication module, the man-machine interaction module, the first time marking module and the first 5G communication module are respectively connected with the first control module, the tester comprises a second 5G communication module, a second control module, a second time marking module and an interface functional unit, the second 5G communication module and the second time marking module are respectively connected with the second control module, the interface functional unit comprises a switching value module, a digital message module, a voltage module and a current module, the switching value module, the digital message module, the voltage module and the current module are respectively connected with the second time marking module, and the second 5G communication module, The second 5G communication module is connected through a 5G network.
Optionally, the first time stamping module and the second time stamping module are FPGA modules.
Optionally, the human-computer interaction module is a liquid crystal touch screen module.
In addition, the invention also provides an application method of the longitudinal differential protection testing device based on the 5G network time synchronization, which comprises the following steps: the control terminal and the two testers respectively carry out clock synchronization through messages which are transmitted through the first time marking module and the second time marking module and subjected to hardware time marking; the control terminal sets designated test parameters for the two testers respectively, controls the two testers to synchronously trigger test states according to a designated mode, and sends voltage and current signals to corresponding protection devices at the same time, so that the longitudinal differential protection test of synchronous output in different places is realized for different protection devices.
Optionally, the control terminal and the two testers perform clock synchronization by transmitting the messages subjected to hardware time stamping by the first time stamping module and the second time stamping module respectively to perform timing at a specified period.
Optionally, the step of performing clock synchronization between the control terminal and the two testers by transmitting the hardware time-stamped messages passing through the first time-stamping module and the second time-stamping module respectively includes: the control terminal generates a main clock message with a time mark after being subjected to hardware time marking by a first time marking module by taking an internal clock as a standard clock, sends the main clock message to the tester, and records the time T1 of sending the main clock message; after each tester receives the master clock message, the tester obtains the time T1 carried by the master clock message, marks the hardware of the received master clock message by a second marking module, and records the time T2 of the received master clock message; the tester takes an internal clock as a standard clock, generates a slave clock message which is subjected to hardware time marking by a second time marking module and then is provided with a time mark and a slave clock ID mark, sends the slave clock message to the control terminal, and records the time T3 of sending the slave clock message; after receiving the slave clock message, the control terminal marks the hardware of the received slave clock message by a first marking module, records the time T4 of receiving the slave clock message, and returns the ID mark of the slave clock and the time T4 corresponding to the slave clock message to each corresponding tester in a feedback message mode; each tester calculates the time offset O and the network transmission delay D of the master clock and the slave clock according to the time T1, the time T2, the time T3 and the time T4; and each tester compensates the internal clock of the tester according to the time offset O of the master clock and the slave clock and the network transmission delay D.
Optionally, the functional expression of the time offset O between the master clock and the slave clock and the network transmission delay D calculated by each tester according to the time T1, the time T2, the time T3, and the time T4 is as follows:
O＝(T2+T3-T1-T4)/2；
D＝(T2+T4-T1-T3)/2；
in the above equation, T1 to T4 represent time T1, time T2, time T3, and time T4, respectively.
Optionally, the step of controlling the two testers to synchronously trigger the test state in the designated manner is triggering in a time synchronization triggering manner or triggering in a switching value triggering manner.
Optionally, the number of the testers is two, and the setting of the specified test parameters for the two testers by the control terminal respectively means: the parameters of one tester are set as follows: the voltage is 57.74V, Va is 0 degrees positive sequence, and the current I1 is 0.2A 0 degrees positive sequence; setting the parameters of another tester as follows: voltage 57.74V, Va 0 ° positive sequence, current I2 0.2a 180 ° positive sequence; the step of controlling the two testers to synchronously trigger the test state in the specified mode refers to the step of triggering in a time-setting triggering mode, so that the two testers output the voltage and the current specified by the parameters to the corresponding protection devices at the same time.
Optionally, the number of the testers is two, and the setting of the specified test parameters for the two testers by the control terminal respectively means: the parameters of one tester are set as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I1 is a positive sequence of 1 time constant value 0 degrees; setting the parameters of another tester as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I2 is a positive sequence of 1-time fixed value of 180 degrees; the step of controlling the two testers to synchronously trigger the test state in the appointed mode is triggered in a switching value triggering mode.
Compared with the prior art, the invention has the following advantages: the longitudinal differential protection testing device based on 5G network time synchronization can realize a plurality of remote synchronous testing systems, effectively reduce the number of testing devices, realize remote synchronous control of a plurality of devices to carry out longitudinal differential protection testing, provide a technical basis for a plurality of synchronous testing technologies of secondary equipment of an intelligent substation and a remote synchronous testing technology, simplify the testing system, reduce the number of devices used in the original testing system, reduce testing requirements, reduce the cost of testing personnel and improve the testing efficiency. The invention relates to an application method of a longitudinal differential protection testing device based on 5G network time synchronization, which is a testing method based on the application of a new generation of 5G network communication technology, and is used for remotely controlling the synchronous output of a plurality of testing devices by controlling a terminal device to send network synchronous information and testing data information, and realizing the remote longitudinal differential protection test by controlling a tester to synchronously output voltage and current. The longitudinal differential protection testing device based on the 5G network time synchronization is based on a high-precision network message time synchronization mode, and a plurality of testers in different places and control terminal equipment are in the same clock source, so that synchronous control of the plurality of equipment is realized. The invention issues test data to the tester through the longitudinal differential protection calculation, realizes the remote longitudinal differential protection test, enables the operation and maintenance of the secondary equipment of the intelligent station to be more intelligent and efficient, and can effectively reduce the personnel cost.
Drawings
Fig. 1 is a schematic structural diagram of a conventional pilot differential protection test system.
Fig. 2 is a schematic structural diagram of a pilot differential protection test system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a control terminal in an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a tester according to an embodiment of the present invention.
FIG. 5 is a schematic diagram illustrating an application method of the pilot differential protection test system according to an embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating clock synchronization of the pilot differential protection test system according to an embodiment of the present invention.
Detailed Description
As shown in fig. 2, 3 and 4, the tandem differential protection testing apparatus based on 5G network time pairing in this embodiment includes a control terminal 1 and at least two testers 2, where the control terminal 1 includes a human-computer interaction module 11, a first control module 12, a first time stamping module 13 and a first 5G communication module 14, the human-computer interaction module 11, the first time stamping module 13 and the first 5G communication module 14 are respectively connected to the first control module 12, the testers 2 include a second 5G communication module 21, a second control module 22, a second time stamping module 23 and an interface function unit 24, the second 5G communication module 21 and the second time stamping module 23 are respectively connected to the second control module 22, the interface function unit 24 includes a switching value module 241, a digital message module 232, a voltage module 233 and a current module 244, the switching value module 241, the digital message module 232, a digital message module 241, a digital message module 232, and a digital message module 244, The voltage module 233 and the current module 244 are respectively connected to the second timing module 23, and the second 5G communication module 21 are connected through a 5G network. Referring to fig. 2, the control terminal 1 can be placed at a location 1 (where the protection device # 1 and the tester # 1 are located) or a location 2 (where the protection device # 2 and the tester # 2 are located) or any other location with 5G signals, the control terminal 1 serves as a master clock and sends a time tick signal to each tester 2 through the 5G signal, each tester 2 serves as a slave clock and performs information interaction with the control terminal 1 (master clock), so that clock precision calibration and compensation are realized, all the testers 2 (slave clocks) and the control terminal 1 (master clock) are in a synchronous state, the synchronous error between the master clock and the slave clock belongs to a us-level error, and the differential protection test requirement is met. The control terminal 1 sends data signals to each tester 2 through 5G signals, the data signals comprise ID of the tester 2 and experimental data of the tester 2, such as amplitude, phase and frequency information of voltage and current, output time control information, receive switching value action signals with ID information returned by each tester 2, test action time and achieve closed-loop testing of the system.
In this embodiment, the human-computer interaction module 11 is a liquid crystal touch screen module. The human-computer interaction module 11 is an external interface component of the control terminal 1, performs interface operation and parameter setting, is connected with the first control module 12, and sends data required by the test to the first control module 12. The liquid crystal operation interface of the human-computer interaction module 11 includes functions of tester 2 information distribution (each tester 2 has a fixed ID), multi-state parameter setting, state trigger mode setting, voltage and current amplitude phase frequency setting, action result display and the like.
In this embodiment, the first control module 12 is implemented by an ARM chip. The first control module 12 is a logic component of the control terminal 1, integrates the test parameters, and forms test data in a standard format to be uploaded to the first 5G communication module 14. The first control module 12 can perform internal data exchange with the first timing mark module 13 at the same time, and perform clock message data exchange.
In this embodiment, the first timing module 13 is an FPGA module. The first time marking module 13 is used for performing hardware time marking on the clock message, and the precision of the FPGA hardware time marking is within 10 ns. The first timing marking module 13 sends the timing marked clock message to the first control module 12, receives the clock message returned by the first control module 12, and performs hardware timing marking on the clock message.
The first 5G communication module 14 is configured to communicate with the second 5G communication module 21 of the tester 2, and send the synchronization signal and the data signal of the control terminal 1 to each tester 2.
The second 5G communication module 21 is configured to receive the test data and the clock signal sent by the control terminal 1, and feed back the clock signal and the action result information to the control terminal 1.
In this embodiment, the second control module 22 is implemented by an ARM chip. The second control module 22 is a logic component of the tester 2, and classifies and integrates the received test data information, and the test data and the clock data received by the tester 2 only adopt the test data and the clock signal containing the ID number of the tester 2, and send the received clock signal to the second timing mark module 23 in real time, and at the same time, upload the clock signal fed back by the second timing mark module 23 to the second 5G communication module 21.
In this embodiment, the second timing module 23 is an FPGA module. The second timing marking module 23 performs hardware timing marking on the clock message, and the accuracy of the timing marking of the FPGA hardware is within 10 ns. The second timing marking module 23 sends the timing marked clock message to the second control module 22, receives the clock message returned by the second control module 22, and performs hardware timing marking on the clock message. The test data sent by the second control module 22 is classified, and data calculation is performed and sent to each interface functional unit 24.
The interface function unit 24 includes a switching value module 241, a digital message module 232, a voltage module 233, and a current module 244, where the switching value module 241 is configured to receive and transmit a switching value; the digital message module 232 is used for receiving and transmitting digital messages; the voltage module 233 is used for outputting analog quantity voltage with controllable parameters; the current module 244 is used to output a parametric controlled analog current.
As shown in fig. 5, the present embodiment further provides an application method of the pilot differential protection testing apparatus based on 5G network pair, including: the control terminal 1 and the two testers 2 respectively carry out clock synchronization through the messages which pass through the hardware time marking of the first time marking module 13 and the second time marking module 23; the control terminal 1 sets designated test parameters for the two testers 2 respectively, controls the two testers 2 to synchronously trigger a test state according to a designated mode, and sends voltage and current signals to corresponding protection devices at the same time, so that the longitudinal differential protection test of synchronous output in different places is realized for different protection devices.
In this embodiment, the step of performing clock synchronization between the control terminal 1 and the two testers 2 by transmitting the hardware time-stamped messages passing through the first time-stamping module 13 and the second time-stamping module 23 respectively includes: as shown in fig. 6, the control terminal 1 uses the internal clock as a standard clock, generates a master clock message with a time stamp after being hardware-stamped by the first stamping module 13, sends the master clock message to the tester 2, and records a time T1 when the master clock message is sent; after each tester 2 receives the master clock message, the time T1 carried by the master clock message is obtained, the second time marking module 23 marks the hardware of the received master clock message, and the time T2 of the received master clock message is recorded; the tester 2 generates a slave clock message with a time mark and a slave clock ID mark after the internal clock is used as a standard clock and is subjected to hardware time marking by the second time marking module 23, sends the slave clock message to the control terminal 1, and records the time T3 of sending the slave clock message; after receiving the slave clock message, the control terminal 1 marks the hardware of the received slave clock message by using the first marking module 13, records the time T4 when the slave clock message is received, and returns the slave clock ID mark and the time T4 corresponding to the slave clock message to each corresponding tester 2 in a feedback message manner; the tester 2 calculates the time offset O between the master clock and the slave clock and the network transmission delay D according to the time T1, the time T2, the time T3 and the time T4, and the definitions of the time offset O between the master clock and the slave clock and the network transmission delay D, which are shown in fig. 6, of the time T1, the time T2, the time T3, the time T4, and the time offset O between the master clock and the slave clock; each tester 2 compensates its own internal clock according to the time offset O of the master clock and the slave clock and the network transmission delay D. In fig. 6, O is the time offset between the master clock and the slave clock; d is the transmission delay of the master clock and the slave clock in the network; a is the link transmission delay from the master clock sending master clock message to the slave clock; b is the link transmission delay from the slave clock to the master clock when the slave clock sends the slave clock message; t1 is the time of sending message of main clock; t2 is the time when the slave clock receives the master clock message; t3 is the slave clock message sending time; t4 is the time when the master clock receives the slave clock message; the following can be known by an implementation schematic diagram:
A＝T2-T1＝D+O；
B＝T4-T3＝D-O；
therefore, in the present embodiment, the functional expression of the time offset O between the master clock and the slave clock and the network propagation delay D calculated by each tester 2 according to the time T1, the time T2, the time T3, and the time T4 is:
O＝(T2+T3-T1-T4)/2；
D＝(T2+T4-T1-T3)/2；
in the above equation, T1 to T4 represent time T1, time T2, time T3, and time T4, respectively.
As an optional implementation manner, in order to improve the reliability and precision of clock synchronization, in this embodiment, clock synchronization is performed between the control terminal 1 and the two testers 2 by transmitting the hardware time-stamped messages passing through the first time-stamping module 13 and the second time-stamping module 23 respectively, so as to perform clock synchronization at a specified period. For example, in this embodiment, the timing is performed with a period of 1 s. In this embodiment, the control terminal 1 serves as a master clock, the testers 2 serve as slave clocks, a slave clock ID tag is added to each slave clock when sending a clock message to the master clock, and each tester 2 has a unique slave clock ID tag. The control terminal 1 tests the master clock, the internal clock of the control terminal 1 is used as a standard clock, the master clock fixedly sends a master clock message to the outside every 1 second, the master clock message sent by the master clock is subjected to time marking by FPGA hardware and is provided with a time mark, and the time of sending the master clock message from the control terminal 1 is recorded as the time of T1. And the time when the slave clock receives the master clock message marks the master clock message hardware, and the time is recorded as T2 time. And then feeding back a slave clock message to the master clock by the slave clock, wherein the slave clock message carries the ID mark of the slave clock, and the sending time of the slave clock message is recorded as the time T3. And the master clock message receives the slave clock message time to perform hardware time marking, and the time is recorded as T4 time. The master clock returns the message with the slave clock ID mark and the time T4 to the slave clock in a feedback message mode, the slave clock receives the feedback message with the self clock ID for analysis, and the whole process is completed within the master clock message sending interval (namely completed within 1 s). The slave clock can obtain the time T1, the time T2, the time T3 and the time T4, and the time offset O of the master clock and the slave clock and the network transmission delay D can be calculated according to the four times. And the slave clock performs clock compensation according to the calculated time offset O and the network transmission delay D, and the clock compensation is performed once per second. The 5G network delay characteristic belongs to us-level range, so the time synchronization precision realized in the mode is better than 1 us.
In this embodiment, the step of controlling the two testers 2 to synchronously trigger the test state in a designated manner is to trigger in a time synchronization triggering manner or a switching value triggering manner. The present embodiment specifically includes two test states:
test state 1: the number of the testers 2 is two, and the control terminal 1 respectively sets the specified test parameters for the two testers 2, namely: the parameters of one tester 2 are set as follows: the voltage is 57.74V, Va is 0 degrees positive sequence, and the current I1 is 0.2A 0 degrees positive sequence; the parameters of another tester 2 are set as follows: voltage 57.74V, Va 0 ° positive sequence, current I2 0.2a 180 ° positive sequence; controlling the two testers 2 to synchronously trigger the test state in an appointed manner means triggering in a time synchronization triggering manner, so that the two testers 2 (both the two devices are synchronized with the master clock) output voltage and current appointed by parameters to the corresponding protection devices at the same time.
Test state 2: the number of the testers 2 is two, and the control terminal 1 respectively sets the specified test parameters for the two testers 2, namely: the parameters of one tester 2 are set as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I1 is a positive sequence of 1 time constant value 0 degrees; the parameters of another tester 2 are set as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I2 is a positive sequence of 1-time fixed value of 180 degrees; the control of the two testers 2 to synchronously trigger the test state in a specified manner means that the test state is triggered by adopting a switching value triggering manner. And receiving the switching value information, recording the switching value action time, and calculating the protection action time.
The longitudinal differential protection test is the same as the method of the existing longitudinal differential protection test, and under the condition that the protection device # 1 and the protection device # 2 are normal: when the line is in an outside fault, the current I1 of the protection device # 1 and the current I2 of the protection device # 2 are equal in magnitude and opposite in direction, the differential current Id (Id is I1+ I2) is the sum of the currents of the protection device # 1 and the protection device # 2, the differential current Id is 0, and the protection device # 1 and the protection device # 2 do not operate; in the event of an intra-line fault, the current I1 of the protection device # 1 and the current I2 of the protection device # 2 have the same magnitude and the same direction, the differential current Id (Id I1+ I2) is a fault current in which the currents at two locations of the protection device # 1 and the protection device # 2 are summed, the differential current Id is 2 times that of the fault current, and the protection device # 1 and the protection device # 2 operate. If the protection device # 1 or the protection device # 2 does not issue a corresponding action, it can be determined that a failure has occurred.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The longitudinal differential protection testing device based on 5G network time synchronization is characterized by comprising a control terminal (1) and at least two testers (2), wherein the control terminal (1) comprises a man-machine interaction module (11), a first control module (12), a first time marking module (13) and a first 5G communication module (14), the man-machine interaction module (11), the first time marking module (13) and the first 5G communication module (14) are respectively connected with the first control module (12), the testers (2) comprise a second 5G communication module (21), a second control module (22), a second time marking module (23) and an interface function unit (24), the second 5G communication module (21) and the second time marking module (23) are respectively connected with the second control module (22), and the interface function unit (24) comprises a switching value module (241), The digital message module (232), the voltage module (233) and the current module (244), the switching value module (241), the digital message module (232), the voltage module (233) and the current module (244) are respectively connected with the second time marking module (23), and the second 5G communication module (21) are connected through a 5G network.
2. The longitudinal differential protection testing device based on 5G network time pairing is characterized in that the first time stamping module (13) and the second time stamping module (23) are FPGA modules.
3. The longitudinal differential protection testing device based on 5G network pair according to claim 1, wherein the human-computer interaction module (11) is a liquid crystal touch screen module.
4. The application method of the pilot differential protection testing device based on 5G network time pairing as claimed in any one of claims 1 to 3, characterized by comprising: the control terminal (1) and the two testers (2) respectively carry out clock synchronization by transmitting messages which pass through the first time marking module (13) and the second time marking module (23) and are subjected to hardware time marking; the control terminal (1) sets appointed test parameters for the two testers (2) respectively, controls the two testers (2) to synchronously trigger a test state according to an appointed mode, and sends voltage and current signals to corresponding protection devices at the same time, so that the longitudinal differential protection test of synchronous output in different places is realized for different protection devices.
5. The application method of the pilot differential protection testing device based on 5G network time setting according to claim 4, characterized in that the control terminal (1) and the two testers (2) respectively perform clock synchronization by transmitting the messages which pass through the first time marking module (13) and the second time marking module (23) for hardware time marking to perform timing with a specified period.
6. The method for applying the pilot differential protection testing device based on 5G network time tick according to claim 4 or 5, characterized in that the step of performing clock synchronization between the control terminal (1) and the two testers (2) by transmitting the messages subjected to hardware time tick by the first time tick module (13) and the second time tick module (23) respectively comprises: the control terminal (1) generates a master clock message with a time mark after being subjected to hardware time marking by the first time marking module (13) by taking an internal clock as a standard clock, sends the master clock message to the tester (2), and records the time T1 of sending the master clock message; after each tester (2) receives the master clock message, the time T1 carried by the master clock message is obtained, the second time marking module (23) marks the hardware of the received master clock message, and the time T2 of the received master clock message is recorded; the tester (2) generates a slave clock message with a time mark and a slave clock ID mark after the internal clock is used as a standard clock and is subjected to hardware time marking by the second time marking module (23), sends the slave clock message to the control terminal (1), and records the time T3 for sending the slave clock message; after receiving the slave clock message, the control terminal (1) marks the hardware of the received slave clock message by a first marking module (13), records the time T4 of receiving the slave clock message, and returns the slave clock ID mark and the time T4 corresponding to the slave clock message to each corresponding tester (2) in a feedback message mode; each tester (2) calculates the time offset O and the network transmission delay D of the master clock and the slave clock according to the time T1, the time T2, the time T3 and the time T4; each tester (2) compensates its own internal clock according to the time offset O of the master clock and the slave clock and the network transmission delay D.
7. The method for applying the pilot differential protection test device based on 5G network pairs as claimed in claim 6, wherein the functional expressions of the time offsets O and the network transmission delays D of the master clock and the slave clock calculated by each tester (2) according to the time T1, the time T2, the time T3 and the time T4 are as follows:
O＝(T2+T3-T1-T4)/2；
D＝(T2+T4-T1-T3)/2；
in the above equation, T1 to T4 represent time T1, time T2, time T3, and time T4, respectively.
8. The application method of the pilot differential protection testing device based on 5G network time pairing is characterized in that the synchronous triggering test state of the two testers (2) controlled according to the specified mode is triggered by time pairing or switching value.
9. The application method of the pilot differential protection testing device based on 5G network time pairing according to claim 4, wherein the number of the testers (2) is two, and the setting of the specified testing parameters for the two testers (2) by the control terminal (1) is as follows: the parameters of one tester (2) are set as follows: the voltage is 57.74V, Va is 0 degrees positive sequence, and the current I1 is 0.2A 0 degrees positive sequence; the parameters of the other tester (2) are set as follows: voltage 57.74V, Va 0 ° positive sequence, current I2 0.2a 180 ° positive sequence; the synchronous triggering test state of the two testers (2) is controlled in an appointed mode, namely the synchronous triggering is adopted, so that the two testers (2) output voltage and current with appointed parameters to the corresponding protection devices at the same time.
10. The application method of the pilot differential protection testing device based on 5G network time pairing according to claim 4, wherein the number of the testers (2) is two, and the setting of the specified testing parameters for the two testers (2) by the control terminal (1) is as follows: the parameters of one tester (2) are set as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I1 is a positive sequence of 1 time constant value 0 degrees; the parameters of the other tester (2) are set as follows: the voltage is 50V, Va is a positive sequence of 0 degrees, and the current I2 is a positive sequence of 1-time fixed value of 180 degrees; the control of the two testers (2) to synchronously trigger the test state in a specified mode refers to the mode of switching value triggering.
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