Intelligent substation relay protection secondary circuit verification device

Abstract

The invention relates to the technical field of power systems, in particular to an intelligent substation relay protection secondary circuit verification device. A time synchronization signal in the intelligent substation is received through the time synchronization time synchronization module, after a local clock is calibrated, synchronous connection between the verification device and external time is disconnected, the time of the device is maintained to be stable through the time synchronization high-precision time keeping module, and when a time synchronization signal interface is lacked, the time synchronization signal is provided through the time synchronization time service module; the switching value acquisition and recording module records signal changes of an intelligent terminal device and a primary device mechanism action contact, the detection devices establish data connection with the relay protection tester through the tester communication interaction module and perform communication interaction, and a communication network of the multiple detection devices and the relay protection tester is constructed. By simplifying the verification process and improving the test reliability, a more efficient solution is provided for the power industry, and safe operation and management of the intelligent substation are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a secondary circuit verification device for relay protection of an intelligent substation. Background Art

[0002] For the current smart substation, since the actual secondary cable circuit of the relay protection device, the switch quantity secondary circuit is all connected to the actual primary equipment mechanism by the smart terminal device, the correctness check of the relay protection switch quantity secondary circuit is transformed into the correctness check of the switch quantity secondary wiring circuit of the smart terminal device. However, since the relay protection device and the smart terminal device are deployed at a long distance in the actual substation, when the relay protection tester is used to apply test data to the relay protection device, the relay protection tester cannot actually obtain the export action of the smart terminal device and the contact action on the relevant primary equipment mechanism circuit by laying a long distance test cable. Only the on-site commissioning personnel can use a multimeter to measure the contact on and off on the export circuit of the smart terminal and the relevant primary equipment mechanism circuit for a simple check. This verification method cannot accurately capture the accurate action time of the corresponding contact, and it also requires multiple commissioning personnel to communicate remotely and manually to transmit information to each other. The entire test process is inefficient and the test accuracy is not high, which is easy to leave hidden dangers and endanger the stable and safe operation of the relay protection equipment.

[0003] At present, the verification of relay protection devices in smart substations is mainly done by applying test analog data to the relay protection devices through relay protection testers, and verifying the analog sampling data, alarm data and action data displayed by the protection devices. As the protection principle of relay protection devices becomes more and more mature, the focus of relay protection device verification has gradually shifted from verification of protection principle to verification of the correctness of relay protection secondary circuits. According to statistics from power grid companies, most of the incorrect actions of relay protection are mainly caused by wiring errors in the secondary circuits. Therefore, verification of the secondary circuits of relay protection is the focus of relay protection verification.

[0004] In view of the above problems, the present invention proposes a device for overall verification of the secondary circuit of relay protection switch quantity in smart substations. The device provided by the present invention is arbitrarily deployed at the exit of smart terminals and the action contacts of the circuit of related primary equipment mechanisms, and automatically collects the corresponding contact action signals and records the position change timing of the corresponding signals. By integrating and reconstructing the recorded data with the transmission data of the relay protection tester, the action conditions of the circuit contacts of the smart terminals and related primary equipment mechanisms corresponding to each test item in the relay protection verification process are fully reproduced, thereby realizing the overall automatic verification of the relay protection and its switch quantity secondary circuit, and effectively improving the efficiency of the verification work of the relay protection device of the smart station. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the present invention provides a smart substation relay protection secondary circuit verification device, which can solve the problems of low efficiency, insufficient accuracy and greater hidden dangers in the traditional relay protection switch secondary circuit verification process. The traditional device relies on manual measurement of the on-off state of the contact, which can neither accurately capture the time of contact action nor require multiple personnel to cooperate remotely, resulting in low verification efficiency and easy omissions.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a smart substation relay protection secondary circuit verification device, comprising: receiving the time synchronization signal in the smart substation through a time synchronization module; after calibrating the local clock, disconnecting the synchronization connection between the verification device and the external time, maintaining the device time stability through a time synchronization high-precision timekeeping module, and providing a time synchronization signal through a time synchronization timing module when there is a lack of a time synchronization signal interface; a switch quantity acquisition and recording module records the signal changes of the action contacts of the smart terminal device and the primary equipment mechanism, a detection device establishes a data connection with a relay protection tester through a tester communication interaction module, and communicates and interacts, and a communication network of multiple detection devices and relay protection testers is established through a network data exchange module.

[0008] As a preferred solution of the smart substation relay protection secondary circuit verification device described in the present invention, the time synchronization signal includes receiving a unified time synchronization signal broadcast by a time synchronization system in the smart substation or receiving a time synchronization signal from a GPS or Beidou satellite.

[0009] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, wherein: the time stability of the device is maintained through the time synchronization high-precision timing module, including that after the external timing signal is disconnected, the time deviation of the device is maintained within 50ns / h.

[0010] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, the time synchronization timing module provides a time synchronization signal, including considering that when the time synchronization system of the intelligent substation cannot provide a timing signal interface, the verification device performs time synchronization through the satellite timing system, and outputs the time synchronization signal to the relay protection tester and the connected verification device that perform relay protection test and verification on site.

[0011] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, the signal changes include the closing and opening state changes of the intelligent terminal equipment and the primary equipment mechanism circuit action contacts and the time of each contact change.

[0012] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, the data connection includes establishing a data connection between the detection device and the experimental relay protection tester, and sending the signal changes recorded by the detection device to the experimental relay protection tester.

[0013] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, the communication interaction includes adopting a wired connection mode and supporting a wireless transmission mode.

[0014] As a preferred solution of the intelligent substation relay protection secondary circuit verification device described in the present invention, the communication networking includes building a communication networking of the detection devices through the network data interaction module of the devices if there are multiple detection devices, and the relay protection tester accesses the communication networking to realize data access and reads the corresponding switch quantity collection and recording data.

[0015] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of any one of the devices in the secondary circuit verification device of relay protection of an intelligent substation are implemented.

[0016] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the devices in a smart substation relay protection secondary circuit verification device are implemented.

[0017] The beneficial effects of the present invention are as follows: by automatically collecting and recording the changes in switch signals, the verification efficiency is significantly improved, the cumbersome manual operations in traditional devices are reduced, and the risk of errors and omissions caused by human factors is reduced. The introduction of time synchronization technology allows the time of each device to remain consistent, and the time of contact action can be accurately recorded, thereby improving the accuracy of the verification. The network data exchange module between multiple devices allows multiple devices to interact with the relay protection tester at the same time, avoiding the inefficient operation of connecting one by one. The present invention not only improves the working efficiency of the relay protection device, but also enhances the overall stability of the power system and reduces potential safety hazards caused by inaccurate verification. By simplifying the verification process and improving the reliability of the test, a more efficient solution is provided for the power industry, which promotes the safe operation and management of smart substations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 A single-device time synchronization signal diagram of a smart substation relay protection secondary circuit verification device provided by an embodiment of the present invention.

[0020] Figure 2 A multi-device time synchronization diagram of a smart substation relay protection secondary circuit verification device provided by an embodiment of the present invention.

[0021] Figure 3 A multi-device contact signal acquisition diagram of a smart substation relay protection secondary circuit verification device provided by an embodiment of the present invention.

[0022] Figure 4 An interactive networking diagram of a smart substation relay protection secondary circuit verification device provided by an embodiment of the present invention.

[0023] Figure 5 A time variation sequence diagram of each device of a relay protection secondary circuit verification device for an intelligent substation provided by an embodiment of the present invention.

[0024] Figure 6 A unified time series diagram of a smart substation relay protection secondary circuit verification device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0026] Example 1, reference Figure 1-Figure 6 , which is the first embodiment of the present invention, and provides a smart substation relay protection secondary circuit verification device, comprising:

[0027] S1: Receive the time synchronization signal in the smart substation through the time synchronization module.

[0028] The present invention proposes a device for overall calibration of the secondary circuit of relay protection switch quantity of an intelligent substation, which mainly includes the following six functional modules: a time synchronization timing module, a time synchronization high-precision timekeeping module, a time synchronization timing module, a switch quantity acquisition and recording module, a tester communication interaction module and a network data exchange module.

[0029] Time synchronization module: This module is mainly used for the device of the present invention to receive the unified time synchronization signal broadcast by the time synchronization system 100 in the smart substation. The device of the present invention uses the time synchronization device in the smart substation to achieve the consistency of the running time of the device of the present invention and the system. In addition, the module can also choose to directly receive GPS and Beidou satellite time synchronization signals, that is, if the time synchronization system 100 of the on-site substation operating environment does not have a redundant time synchronization signal interface to provide a time synchronization signal for the device of the present invention, the device can directly obtain time from the satellite time synchronization system 200 to achieve consistency with the running time of the substation system.

[0030] Time synchronization high-precision timing module: This module is mainly used for disconnecting the timing connection between the device of the present invention and the time synchronization system 100 of the substation or the satellite time synchronization system 200 after the device of the present invention receives the timing signal of the time synchronization system 100 of the substation or the satellite time synchronization system 200 to calibrate the local clock of the device of the present invention. The device of the present invention maintains the stability of its own time through the time synchronization high-precision timing module, that is, after the external timing signal is disconnected, the time deviation of the device of the present invention is maintained within 50ns / h, that is, the time accuracy of the device of the present invention for a long time after being separated from the external timing signal is guaranteed.

[0031] Time synchronization and timing module: This module is mainly used for the device of the present invention to provide time synchronization to the relay protection tester 400 and other devices of the present invention as a temporary time synchronization signal after the device of the present invention maintains its own time stability through its own time synchronization high-precision timing module. It is mainly used in the case where the on-site substation time synchronization system 100 cannot provide a timing signal interface. After a device of the present invention is time synchronized through the satellite timing system 200, it outputs a time synchronization signal to the relay protection tester 400 and other devices of the present invention that are performing relay protection test and verification on site, thereby achieving time consistency between multiple devices of the present invention and the relay protection tester 400 used for testing.

[0032] Switch quantity acquisition and recording module: This module is mainly used for the device of the present invention to access the exit contact signal of the intelligent terminal device 600 of the intelligent substation and the circuit action contact signal of the relevant primary equipment mechanism 700. When the relay protection device is verified by the relay protection tester 400, the action or alarm of the relay protection device 500 will trigger the change of the closing and opening of the circuit action contact of the intelligent terminal device 600 and the relevant primary equipment mechanism 700. The device of the present invention records the time of each closing and opening of the accessed contact signal through the switch quantity acquisition and recording module.

[0033] Tester communication interaction module: This module is mainly used for communication interaction between the device of the present invention and the relay protection tester 400 used for calibrating the relay protection device 500. The communication interaction method can adopt the wired connection method of network cable and optical fiber, and also supports the use of wireless transmission methods such as WIFI, 4G, Bluetooth, etc. The tester communication interaction module establishes a data connection between the device of the present invention and the test relay protection tester 400, and sends the closing and opening change data of the circuit action contacts of all intelligent terminal devices 600 and related primary equipment mechanisms 700 recorded by the device of the present invention to the test relay protection tester 400.

[0034] Network data exchange module: This module is mainly used for network data exchange between multiple devices of the present invention and the experimental relay protection tester 400. When there are multiple devices of the present invention, the communication networking of multiple devices of the present invention can be realized through the network data exchange modules of multiple devices of the present invention. The experimental relay protection tester 400 can access the data of multiple devices of the present invention by connecting to the communication network of multiple devices of the present invention, and can read the corresponding switch quantity collection and recording data from multiple devices of the present invention at the same time, avoiding the inefficiency caused by the need to connect multiple devices of the present invention to the experimental relay protection tester 400 one by one.

[0035] It should be noted that if Figure 1 As shown, the time synchronization system 100 or the satellite time synchronization system 200 in the smart substation is used to synchronize the time synchronization signal to the device 1 of the present invention so that the time of the device 1 of the present invention is consistent with the time of the smart substation system. The substation time synchronization system 100 is a time synchronization system constructed by using the time synchronization device in the substation as a time synchronization signal source to synchronize all secondary devices in the station. The satellite time synchronization system 200 refers to a time synchronization system constructed by GPS satellites or Beidou satellites, which uses antennas to receive time synchronization signals. The process of time synchronization is as follows:

[0036] The time synchronization signals output by the substation time synchronization system 100 are mainly PPS and IRIG-B code signals, which are pulse signals themselves, while the satellite time synchronization system 200 outputs electromagnetic wave signals, which require the GPS signal receiving module configured by the device of the present invention to receive the electromagnetic wave signal and perform signal processing such as frequency conversion demodulation to convert it into a PPS pulse signal. This device has a built-in crystal oscillator (referred to as crystal oscillator), which generates the clock frequency signal required for the central processing unit (CPU) of the device of the present invention to execute instructions. Therefore, the time synchronization process is to adjust the time frequency of the crystal oscillator inside the device of the present invention according to the pulse frequency of the external time synchronization signal.

[0037] The device of the present invention counts the clock at a certain time period, and observes the difference between the count value and the count value of the crystal oscillator nominal frequency at the frequency, and adjusts the temperature-compensated voltage-controlled oscillator by controlling the voltage to achieve the correction of its own precise frequency within a continuous number of second pulse cycles. After the device of the present invention synchronizes with the external time synchronization signal, it synchronizes and locks the internal clock.

[0038] S2: After calibrating the local clock, disconnect the synchronization connection between the verification device and the external time, and maintain the stability of the device time through the time synchronization high-precision timekeeping module. When there is a lack of a time synchronization signal interface, provide a time synchronization signal through the time synchronization timing module.

[0039] It should be noted that by disconnecting the time synchronization signal connection between the device 1 of the present invention and the substation time synchronization system 100 or the satellite time synchronization system 200, the high-precision timekeeping module of the device 1 of the present invention is started to maintain the time stability of the device 1 of the present invention.

[0040] When the external satellite signal is lost, the device of the present invention loses the unified time reference, the crystal oscillator frequency can no longer be accurately sensed and corrected, and the synchronous clock module will switch to the punctual clock algorithm. The core of the synchronous punctual clock algorithm is to accurately predict the future frequency changes of the output crystal oscillator after losing the synchronous time reference. The crystal oscillator frequency has the characteristics of high stability in a short time, and it can be considered that the crystal oscillator frequency is constant in a short time. However, in the long term, due to reasons such as changes in its own stress, the crystal oscillator frequency will change slowly, which is called the aging drift phenomenon. At the same time, affected by the manufacturing process, there will be differences in physical structure between individual crystal oscillators, so it is difficult to analyze the crystal oscillator aging drift law in principle and derive an accurate description using mathematical formulas. Usually, an empirical model is used to estimate the frequency aging drift of the crystal oscillator. Therefore, if you want to obtain the crystal oscillator frequency aging drift law, the first condition is to have an accurate record of the crystal oscillator's historical state, otherwise the fitted mathematical model will be inaccurate. The error caused by the mathematical model will increase the cumulative time error of the acceleration device. Therefore, it is necessary to use filtering algorithms and neural network algorithms to record and train the historical status data of the crystal oscillator. The filtering algorithm is mainly used to filter out the relevant high-frequency components in the recorded historical data and perform smoothing. The good adaptability and data fitting ability of the neural network algorithm are then used to train the historical record data, and an accurate crystal oscillator frequency aging drift model can be obtained, so that the frequency change trend of the crystal oscillator frequency after the external time synchronization signal is removed can be predicted and corrected in time, thereby greatly improving the timekeeping ability of the device of the present invention.

[0041] like Figure 2 As shown, the device 1 of the present invention is used to synchronize time with other devices of the present invention, such as the device 2 to the device 4 of the present invention and the experimental relay protection tester 400, so that the time of all devices of the present invention and the experimental relay protection tester is consistent.

[0042] S3: The switch quantity acquisition and recording module records the signal changes of the action contacts of the intelligent terminal device 600 and the primary equipment mechanism 700. The detection device establishes a data connection with the relay protection tester 500 through the tester communication interaction module and communicates with it. The communication network of multiple detection devices and the relay protection tester 500 is constructed through the network data exchange module.

[0043] It should be noted that if Figure 3As shown, multiple devices of the present invention are deployed at the intelligent terminal 600 and the relevant primary equipment mechanism 700, respectively, and the contact signal of the required contact change verification is connected to the device of the present invention, and the test relay protection tester 500 is controlled to increase the quantity item by item according to the configured test items. The protection device realizes the corresponding alarm and action output according to the increase of the relay protection tester 500, and the corresponding contacts of the corresponding intelligent terminal 600 and the relevant primary equipment mechanism 700 are closed and opened alternately, and the device of the present invention records the displacement time of all connected contact signals. The relevant primary equipment mechanism 700 mainly refers to the primary equipment circuit breaker, isolation knife switch, etc. of the substation. The secondary equipment of the intelligent substation refers to the equipment that is not directly involved in the production, transmission, and distribution of electric energy, and is used for auxiliary functions such as monitoring, protection, control, communication and metering. The intelligent terminal device 600 in the figure refers to a secondary equipment of an intelligent substation.

[0044] like Figure 4 As shown, after all the test items of the experimental relay protection tester 400 are executed, all the devices of the present invention are moved to the experimental relay protection tester 400. The experimental device of the present invention builds an internal communication network through internal interactive networking, and connects the experimental relay protection tester 400. The internal interactive networking logic is that the device of the present invention is equipped with a switching chip and provides two externally connected network ports. The host computer, the externally connected network port 1 and the externally connected network port 2 of the device of the present invention are connected to the switching chip at the same time. According to the connection method shown in the figure, for the device 1 of the present invention, its externally connected network port 1 is connected to the experimental relay protection tester, and the externally connected network port 2 is connected to the externally connected network port 1 of the device 2 of the present invention, so as to realize the connection of the experimental relay protection tester, the device 1 of the present invention and the device 2 of the present invention on the same internal network. The network port 2 of the device 2 of the present invention continues to be connected to the network port 1 of the device 3 of the present invention, and the number of devices of the present invention that are connected can be continuously expanded by analogy, thereby realizing the internal networking between multiple devices of the present invention and the experimental relay protection tester 400.

[0045] The test relay protection tester 400 communicates with all the devices of the present invention to obtain the contact displacement information recorded in each device of the present invention. The test relay protection tester 400 reconstructs a unified time series based on the time when all test items recorded by itself output the test data and the time when all contact displacement information recorded in each device of the present invention, constructs the contact displacement information corresponding to each test item of the test relay protection tester 400, and compares and checks the contact displacement information with the contact displacement conditions preset in the test item, thereby realizing the judgment of the correctness of the mechanism circuit.

[0046] During the test process, the experimental relay protection tester and each device of the present invention will record the relevant data of the test process according to the internal clock of each device. For example, the experimental relay protection tester 400 will record the start and end time of each test, as well as the time when the test data output during the test changes, thereby forming a signal output time series of the experimental relay protection tester 400. As for the device of the present invention, it mainly records the change time of the relevant contacts in the connected secondary circuit. If the time between the experimental relay protection tester 400 and each device of the present invention is not synchronized, the corresponding recorded time will record the corresponding change sequence according to the internal time base of each device, such as Figure 5 As shown, since the time bases of various devices are inconsistent, the change sequences recorded by each device cannot be reconstructed by sequence normalization, and the alignment of the recorded data cannot be achieved.

[0047] like Figure 6 As shown, through time synchronization and time keeping, the time base of the experimental relay protection tester 400 and the device of the present invention can be unified, that is, the change moments of related records can refer to the same time base, so that they can be reconstructed into a unified time series.

[0048] In each test item set by the test relay protection tester 400, in addition to setting the test data to be output, the change results of the action signal contacts in the secondary circuit to be judged and verified can also be set, that is, which action signal contacts should be closed or opened in a certain test item, the time interval range of the change relative to the start time of the test, and the number of changes of the action contacts. The test relay protection tester 400 reconstructs a unified time series through the time of the test data output by the test item recorded by itself and the time of all contact displacement information recorded in each device of the present invention, and can extract the change information of the action contacts to be verified within the start and end time of each test item, thereby calculating the change of each action contact, the change relative to the start time of the test, and the number of changes, so as to realize the verification of the correctness of the action signal contact action.

[0049] Embodiment 2, the second embodiment of the present invention, is different from the previous embodiment in that:

[0050] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the device described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0051] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0052] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0053] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or devices can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

Claims

1. A smart substation relay protection secondary circuit verification device, characterized in that: include, Receive the time synchronization signal in the smart substation through the time synchronization module; After calibrating the local clock, disconnect the synchronization connection between the calibration device and the external time, and maintain the stability of the device time through the time synchronization high-precision timekeeping module. When there is no time synchronization signal interface, provide the time synchronization signal through the time synchronization timing module; The switch quantity acquisition and recording module records the signal changes of the action contacts of the intelligent terminal equipment and the primary equipment mechanism. The detection device establishes a data connection with the relay protection tester through the tester communication interaction module and communicates with it. The communication network of multiple detection devices and relay protection testers is constructed through the network data exchange module.

2. A smart substation relay protection secondary circuit verification device as claimed in claim 1, characterized in that: The time synchronization signal includes receiving a unified time synchronization signal broadcast by a time synchronization system in a smart substation or receiving a time synchronization signal from a GPS or Beidou satellite.

3. A smart substation relay protection secondary circuit verification device as claimed in claim 2, characterized in that: The method of maintaining the device time stability through the time synchronization high-precision timing module includes maintaining the device time deviation within 50ns / h after disconnecting the external timing signal.

4. A smart substation relay protection secondary circuit verification device as claimed in claim 3, characterized in that: The time synchronization module provides a time synchronization signal, including considering that when the time synchronization system of the smart substation cannot provide a timing signal interface, the verification device performs time synchronization through the satellite timing system, and outputs the time synchronization signal to the relay protection tester and the connected verification device that perform relay protection test and verification on site.

5. A smart substation relay protection secondary circuit verification device as claimed in claim 4, characterized in that: The signal changes include the closing and opening state changes of the action contacts of the intelligent terminal device and the primary device mechanism loop and the time of each contact change.

6. A smart substation relay protection secondary circuit verification device as claimed in claim 5, characterized in that: The data connection includes establishing a data connection between the detection device and the experimental relay protection tester, and sending the signal changes recorded by the detection device to the experimental relay protection tester.

7. A smart substation relay protection secondary circuit verification device as claimed in claim 6, characterized in that: The communication interaction includes adopting a wired connection mode and supporting a wireless transmission mode.

8. A smart substation relay protection secondary circuit verification device as claimed in claim 7, characterized in that: The communication networking includes building a communication networking of the detection devices through the network data interaction modules of the detection devices if there are multiple detection devices, and the relay protection tester accesses the communication networking to achieve data access and read the corresponding switch quantity collection and recording data.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the apparatus according to any one of claims 2 to 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the apparatus according to any one of claims 2 to 8 are implemented.

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