Differential relay protection device, equipment, system, method and storage medium

Abstract

The embodiment of the invention provides a differential relay protection device, equipment, system and method and a storage medium, the differential relay protection device comprises a clock module, the clock module is configured to create a first clock for the differential relay protection device, the first clock is configured in a precision time protocol domain, and the clock module is configured to create a second clock for the differential relay protection device, the second clock is configured in a precision time protocol domain; the second clock and the first clock operate independently; a power data obtaining module configured to obtain power data collected based on a second clock; and a processing module configured to perform a differential relay protection function through the first clock. According to the differential relay protection device disclosed by the invention, an independent precise time protocol domain can be configured for a differential relay protection function, so that power data synchronization is realized in a mode of low hardware cost, low system framework complexity, high flexibility and high operation stability, and the differential relay protection function is realized.

Description

Technical Field

[0001] This invention relates to power systems, and more particularly to differential relay protection devices, equipment, systems, methods, and storage media. Background Technology

[0002] Differential relay protection is based on Kirchhoff's current theorem (the sum of the currents flowing into a node in a circuit is equal to zero). It treats the protected electrical equipment (e.g., transformers, transmission lines, etc.) as a node. When the equipment is operating normally, the current flowing into and out of the equipment is equal, the differential current is zero, and the differential relay protection does not operate. However, when a fault occurs inside the equipment, the currents flowing into and out are no longer equal, the differential current is greater than zero, and when this current exceeds the setting value of the differential relay protection device, the protection operates, disconnecting the power supply to the faulty equipment.

[0003] One of the key technologies for implementing differential relay protection lies in synchronizing the current sampling values ​​at each end of electrical equipment, such as transmission lines. In some solutions, time synchronization of substations can be achieved based on the Global Positioning System (GPS), thereby synchronizing current sampling values. However, GPS-based current sampling value synchronization schemes have many uncertainties. For example, due to obstructions from buildings, terrain, and other obstacles, as well as weather factors, GPS signals may become very weak for periods of time. In such cases, the synchronization effect of GPS-based current sampling value synchronization schemes may deteriorate or fail. Therefore, a power data synchronization scheme with low hardware cost, low system architecture complexity, high flexibility, and high operational stability is desired to achieve differential relay protection functionality. Summary of the Invention

[0004] Embodiments of this disclosure provide a differential relay protection device, comprising: a clock module configured to: create a first clock for the differential relay protection device, the first clock being configured in a precise time protocol domain; create a second clock for the differential relay protection device, the second clock operating independently of the first clock; a power data acquisition module configured to acquire power data collected based on the second clock; and a processing module configured to perform differential relay protection functions via the first clock.

[0005] According to an embodiment of the present disclosure, a differential relay protection device is provided, wherein the precise time protocol domain is further configured with a first clock of one or more other differential relay protection devices, wherein one of the first clocks of the one or more other other differential relay protection devices and the first clock of the differential relay protection device is set as the master clock of the precise time protocol domain.

[0006] According to an embodiment of the present disclosure, in a differential relay protection device, the power data acquisition module is configured to acquire power data from the power system locally on the differential relay protection device based on a second clock.

[0007] According to an embodiment of the present disclosure, in a differential relay protection device, the power data acquisition module is configured to: acquire the power data acquired based on a second clock from an external merging unit, wherein the power data acquired based on the second clock is acquired by the external merging unit based on the second clock.

[0008] According to an embodiment of the present disclosure, in a differential relay protection device, the processing module is configured to: convert the power data acquired by the power data acquisition module based on a second clock into first power data based on a first clock, and use the first power data to perform a differential relay protection function.

[0009] The differential relay protection device according to an embodiment of the present disclosure further includes a communication module configured to receive second power data based on a first clock from at least a portion of the one or more other differential relay protection devices; wherein the processing module is configured to perform the differential relay protection function using the first power data and the second power data.

[0010] According to embodiments of the present disclosure, in a differential relay protection device, the communication module is further configured to send the first power data to at least a portion of the one or more other differential relay protection devices.

[0011] According to an embodiment of the differential relay protection device of the present disclosure, the second clock is timed by the internal crystal oscillator of the differential relay protection device.

[0012] According to an embodiment of the present disclosure, a differential relay protection device is installed in a substation, wherein the second clock is timed by the main clock of the substation via the clock module.

[0013] According to an embodiment of the differential relay protection device of this disclosure, the second clock is timed by the main clock of the substation using one of the precise time protocol domain and the inter-range instrument group-B code via the clock module.

[0014] Embodiments of this disclosure provide a differential relay protection device, comprising: a first clock module configured to create a first clock for the differential relay protection device, the first clock being configured in a precise time protocol domain; a second clock module configured to create a second clock for the differential relay protection device, the second clock operating independently of the first clock; a power data acquisition module configured to acquire power data collected based on the second clock; and a processing module configured to perform differential relay protection functions via the first clock.

[0015] Embodiments of this disclosure provide an electrical device including the relay protection device described above.

[0016] Embodiments of this disclosure provide a relay protection system, including the relay protection device or power equipment described above.

[0017] Embodiments of this disclosure provide a method for a differential relay protection device, comprising: creating a first clock for the differential relay protection device, the first clock being configured in a precise time protocol domain; creating a second clock for the differential relay protection device, the second clock operating independently of the first clock; obtaining power data acquired based on the second clock; and performing a differential relay protection function via the first clock.

[0018] Embodiments of this disclosure provide a computer-readable storage medium having computer-executable instructions stored thereon, which, when executed by a processor, are used to implement the method described above.

[0019] According to the embodiments of the present disclosure, the differential relay protection device, equipment, system, method, and storage medium can be configured with an independent precise time protocol domain for the differential relay protection function, so as to realize power data synchronization in a way with low hardware cost, low system architecture complexity, high flexibility, and high operational stability, thereby realizing the differential relay protection function. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. It is clear that the drawings described below are merely some exemplary embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] Figure 1A This is a schematic diagram of a differential relay protection device according to an embodiment of the present disclosure.

[0022] Figure 1B This is another schematic diagram of a differential relay protection device according to an embodiment of the present disclosure.

[0023] Figure 2A This is a schematic diagram illustrating the implementation of differential relay protection function by a differential relay protection device according to an embodiment of the present disclosure.

[0024] Figure 2B This is another schematic diagram illustrating the implementation of differential relay protection function by a differential relay protection device according to an embodiment of the present disclosure.

[0025] Figure 3 This is a schematic diagram of an electrical device according to an embodiment of the present disclosure.

[0026] Figure 4 This is a schematic diagram of a relay protection system according to an embodiment of the present disclosure.

[0027] Figure 5 A flowchart of a method for a differential relay protection device according to an embodiment of the present disclosure is shown.

[0028] Figure 6 This is a schematic diagram of a non-transitory computer-readable medium according to embodiments of the present disclosure. Detailed Implementation

[0029] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this disclosure. The terms “comprising” and “including” and their derivatives mean, but are not limited to, “including”. The phrase “at least one”, when used with a list of items, means that different combinations of one or more of the listed items may be used, and that only one item in the list may be required. For example, “at least one of A, B, and C” includes any one of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C.

[0030] Definitions of other specific words and phrases are provided throughout this disclosure. Those skilled in the art will understand that, in many, if not most, cases, such definitions apply to the prior and future use of the words and phrases thus defined.

[0031] The various embodiments of the principles of this disclosure described below in conjunction with the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this disclosure in any way. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged system or device. In some cases, the actions described in this disclosure may be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific order or sequential sequence to achieve the desired result. In certain embodiments, multitasking and parallel processing may be advantageous.

[0032] The text and accompanying drawings are provided by way of example only to aid in understanding this disclosure. They should not be construed as limiting the scope of the claims appended to this disclosure in any way. Throughout the drawings, the same reference numerals generally indicate the same elements. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the content of this disclosure, that changes may be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0033] Although differential relay protection devices are shown in the accompanying drawings as corresponding modules, those skilled in the art will understand that the configuration of the corresponding modules is illustrative and not restrictive. In this specification, modules can be implemented by software, hardware, or a combination of software and hardware. For example, in some embodiments, multiple modules implementing multiple functions shown in the drawings may be combined into a single module implementing the same multiple functions. In other embodiments, a single module implementing some functions shown in the drawings may be split into multiple modules implementing the same some functions.

[0034] Figure 1A This is a schematic diagram of a differential relay protection device according to an embodiment of the present disclosure. Figure 1A As shown, the differential relay protection device 1000 may include a clock module 1100, a power data acquisition module 1200, and a processing module 1300.

[0035] Clock module 1100 can create a first clock 1110 for differential relay protection device 1000. The first clock 1110 is configured in a Precision Time Protocol (PTP) domain. A PTP domain is a high-precision time synchronization protocol. PTP domains can be used in communication networks to ensure time consistency between different devices. A PTP domain can be a logical group of devices using PTP. A physical network can be divided into multiple PTP domains, each with a synchronization time. Devices within a domain achieve time synchronization through PTP, and different PTP domains are independent of each other. The first clock 1110 can be used by differential relay protection device 1000 to perform differential relay protection functions. That is, differential relay protection device 1000 can reside in a dedicated PTP time domain for implementing differential relay protection functions.

[0036] The clock module 1100 can create a second clock 1120 for the differential relay protection device 1000. The second clock 1120 can operate independently of the first clock 1110. The second clock 1120 can be out of sync with the first clock 1110. For example, the second clock 1120 can be in a different time domain that is timed by other devices. Furthermore, the second clock 1120 can operate freely. The second clock 1120 can be used to collect power data. In other words, the differential relay protection device 1000 can also be in a different time domain for implementing functions other than differential relay protection.

[0037] The power data acquisition module 1200 can acquire power data collected based on the second clock 1120. The power data may include parameters such as current, voltage, and frequency. The power data can be collected based on the second clock 1120. For example, the power data can be collected by the differential relay protection device 1000 itself based on the second clock 1120. Alternatively, the power data can be collected by other devices based on the second clock 1120, and the differential relay protection device 1000 receives this power data from those other devices.

[0038] The processing module 1300 can perform differential relay protection functions via the first clock 1110. For example, the processing module 1300 can perform differential relay protection functions using power data based on the first clock 1110. The power data based on the first clock 1110 can be converted by the processing module 1300 or can be received by the differential relay protection device 1000 from other differential relay protection devices.

[0039] Although not shown, the differential relay protection device 1000 may also include a storage module. For example, one or more computer programs may be stored in the storage module and configured to be read and executed by the processing module 1300. These one or more computer programs include methods for performing differential relay protection according to at least one embodiment of the present disclosure. When executed by the processing module 1300, these methods can perform the differential relay protection method according to at least one embodiment of the present disclosure. The method for differential relay protection will be referred to below. Figure 5 Detailed description.

[0040] The storage module and processing module 1300 can be interconnected via a bus system and / or other forms of connection / communication mechanisms (not shown). For example, the bus can be a Peripheral Component Interconnect Standard (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc.

[0041] For example, the processing module 1300 may be a central processing unit (CPU), a digital signal processor (DSP), a graphics processing unit (GPU), or other processing units with data processing capabilities and / or program execution capabilities, such as a field-programmable gate array (FPGA). The processing module 1300 may be a general-purpose processor or a dedicated processor, capable of controlling other components in the differential relay protection device 1000 to perform desired functions.

[0042] Exemplarily, the storage module may include any combination of one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, erasable programmable read-only memory (EPROM), portable compact disc read-only memory (CD-ROM), USB memory, flash memory, etc. One or more computer programs may be stored on the computer-readable storage medium, and the processing module 1300 may run one or more computer programs to implement various functions of the relay protection device 1000. Various application programs and various data, as well as various data used and / or generated by the application programs, may also be stored in the computer-readable storage medium.

[0043] For example, the differential relay protection device 1000 may further include a peripheral interface (not shown in the figure). This peripheral interface can be various types of interfaces, such as a USB interface, a Lightning interface, a fiber optic interface, etc. The differential relay protection device 1000 can communicate with networks and other devices via wired or wireless communication, such as the Internet, intranets and / or wireless networks such as cellular telephone networks, wireless local area networks (LANs) and / or metropolitan area networks (MANs), and wired networks such as fiber optic Ethernet. Wired communication can include fiber optic communication, coaxial cable communication, etc. Wireless communication can use any of a variety of communication standards, protocols, and technologies, including but not limited to Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), Wideband Code Division Multiple Access (W-CDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Bluetooth, Wi-Fi (e.g., based on IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, and / or IEEE 802.11n standards), Voice over Internet Protocol (VoIP), Wi-MAX, protocols for email, instant messaging, and / or Short Message Service (SMS), or any other suitable communication protocol.

[0044] The differential relay protection device 1000 may be, for example, a system-on-a-chip (SOC) or a device including the SOC. For example, it may be any combination of data processing modules and hardware, and the embodiments disclosed herein are not limited thereto.

[0045] Figure 1B This is another schematic diagram of a differential relay protection device according to an embodiment of the present disclosure. Figure 1B As shown, the differential relay protection device 1001 may include a first clock module 1101, a second clock module 1102, a power data acquisition module 1200, and a processing module 1300. Figure 1B In the differential relay protection device 1001, and Figure 1A The same components will not be described again.

[0046] The first clock module 1101 can create a first clock 1110 for the differential relay protection device 1001. The first clock 1110 is configured in the PTP domain. The first clock 1110 can be used by the differential relay protection device 1001 to perform differential relay protection functions. That is, the differential relay protection device 1001 can be in the PTP time domain dedicated to implementing differential relay protection functions.

[0047] The second clock module 1102 can create a second clock 1120 for the differential relay protection device 1001. The second clock 1120 can operate independently of the first clock 1110. The second clock 1120 can be out of sync with the first clock 1110. For example, the second clock 1120 can be in a different time domain that is timed by other devices. Furthermore, the second clock 1120 can operate freely. The second clock 1120 can be used to collect power data. In other words, the differential relay protection device 1001 can also be in a different time domain for implementing functions other than differential relay protection.

[0048] According to one disclosed embodiment, the first clock module 1101 and the second clock module 1102 can perform functions similar to those performed by the clock module 1100.

[0049] Figure 2A This is a schematic diagram illustrating the implementation of differential relay protection function by a differential relay protection device according to an embodiment of the present disclosure.

[0050] Figure 2A In the differential relay protection device 1000, and Figure 1A The same components will not be described again. Those skilled in the art will understand that... Figure 2A Some configurations of the differential relay protection device 1000 and differential relay protection device 2000 (e.g., clock module 1100) can be replaced with Figure 1BThe configuration of the differential relay protection device 1001 shown (e.g., first clock module 1101 and second clock module 1102). Figure 2A As shown, the differential relay protection device 1000 may further include a communication module 1400. The differential relay protection device 2000 may be another differential relay protection device with the same or similar configuration as the differential relay protection device. A description of the differential relay protection device 2000 can be made with reference to the description of the differential relay protection device 1000.

[0051] like Figure 2A As shown, the PTP domain can also be configured with the first clocks of one or more other differential relay protection devices. For example, in addition to the first clock 1110 of differential relay protection device 1000, the PTP domain can also be configured with the first clock 2110 of differential relay protection device 2000. Although Figure 2A Only one other differential relay protection device 2000 is shown in the figure, but those skilled in the art will understand that more differential relay protection devices can be configured in the PTP domain with a first clock.

[0052] Using the Best Master Clock Algorithm (BMCA), a first clock in the PTP domain can be set as the master clock of the PTP domain, while the remaining first clocks in the PTP domain can serve as slave clocks. For example, one of the first clocks of one or more other differential relay protection devices, including first clock 2110, and first clock 1110, can be set as the master clock of the PTP domain. The other first clocks in the PTP domain can be timed by this master clock.

[0053] like Figure 2A As shown, the power data acquisition module 1200 can be configured to acquire power data locally from the power system based on the second clock 1120 within the differential relay protection device 1000. For example, the power data acquisition module 1200 may include power data acquisition units such as current sensors and voltage sensors. That is, the differential relay protection device 1000 itself can acquire power data based on the second clock 1120 without the need for an external power data acquisition device.

[0054] like Figure 2AAs shown, the differential relay protection device can be installed in substation 3000. Although not shown, the differential relay protection device 2000 can also be located in another substation. When the power data is collected by the differential relay protection device 1000 itself, the second clock 1120 may or may not be timed by the substation's master clock via a clock module. In one embodiment, the second clock 1120 may be timed by the internal crystal oscillator of the differential relay protection device 1000, rather than by an external device or equipment such as substation 3000. In another embodiment, the second clock 1120 may be timed by the substation master clock (GMC) 3100 of substation 3000. The substation master clock 3100 can obtain time information using satellite positioning / communication signals. For example, the substation master clock 3100 can obtain time information using Global Positioning System (GPS) signals, Global Navigation Satellite System (GLONASS) signals, Galileo signals, BeiDou signals, Indian Regional Navigation Satellite System (NAVIC), Quasi-Zenith Satellite System (QZSS), etc. When the second clock 1120 is timed by the substation master clock 3100, the substation master clock 3100 can time the second clock 1120 via clock module 1100 using either the PTP domain or the Inter-Range Instrument Group-B code (IRIG-B). For example, the substation master clock 3100 can be in a different PTP domain than the first clock 1110 (the PTP domain of which the second clock 1120 is located). Figure 2A (Not shown in the image). The substation master clock 3100 can be the master clock in the PTP domain where the second clock 1120 is located. For example, the substation master clock 3100 can use IRIG-B technology to provide time synchronization to the second clock 1120.

[0055] The processing module 1300 can be configured to convert power data acquired by the power data acquisition module 1200 based on the second clock 1120 into power data based on the first clock 1110. The conversion process of the power data may include a resampling process. For ease of description, the power data based on the first clock 1110 obtained by the processing module 1300 of the differential relay protection device 1000 is referred to here as the first power data.

[0056] The processing module 1300 can perform differential relay protection functions using the first power data. Specifically, the processing module 1300 can perform differential relay protection functions based on the first power data and power data from other relay protection devices based on a first clock.

[0057] like Figure 2AAs shown, the differential relay protection device 1000 may further include a communication module 1400. The communication module 1400 may be configured to receive power data based on a first clock from at least a portion of one or more other differential relay protection devices (e.g., differential relay protection device 2000 among other differential relay protection devices). For ease of description, the power data based on the first clock received by the communication module 1400 of the differential relay protection device 1000 is referred to herein as second power data. That is, when the differential relay protection device 1000 is configured in substation 3000 and the differential relay protection device 2000 is configured in another substation, for the differential relay protection device 1000, the first power data may be power data relative to substation 3000, and the second power data may be power data relative to the other substation. For example, the second power data received by the communication module 1400 from the differential relay protection device 2000 can be obtained by the processing module 2300 of the differential relay protection device 2000 converting the power data obtained by the power data acquisition module 2200.

[0058] The processing module 1300 can perform differential relay protection functions using the first power data and the second power data. For example, the processing module 1300 can use the first power data and the second power data to calculate the vector sum of the currents to perform differential relay protection functions. The specific process of performing differential relay protection functions using the first power data and the second power data may include more steps, which will not be described in detail here to avoid obscuring the focus of the present invention.

[0059] The communication module 1400 can also be configured to send first power data to at least a portion of one or more other differential relay protection devices. For example, the communication module 1400 can also send the first power data to the differential relay protection device 2000 for the differential relay protection device 2000 to perform differential relay protection functions. Alternatively or additionally, the communication module 1400 can also directly send a trip signal to at least a portion of one or more other differential relay protection devices based on the execution result of the differential relay protection function.

[0060] like Figure 2AAs shown, the differential relay protection device 1000 according to an embodiment of this disclosure can configure an independent PTP domain for the differential relay protection function. To implement the differential relay protection function, the differential relay protection device can exchange power data via a wired communication network such as fiber optic Ethernet. The PTP domain for the differential relay protection function can also be implemented via this wired communication network. By reusing this wired communication network, power data synchronization can be achieved with low hardware cost and low system architecture complexity, thereby realizing the differential relay protection function. Since the PTP domain for the differential relay protection function is implemented via a wired communication network such as fiber optic Ethernet, power data synchronization is unaffected or almost unaffected by environmental factors, resulting in high operational stability. Furthermore, according to the embodiments of this disclosure, time synchronization between individual substations (e.g., the master clocks of each substation) is not required when implementing the differential relay protection function, thus providing high system flexibility.

[0061] Figure 2B This is another schematic diagram illustrating the implementation of differential relay protection function by a differential relay protection device according to an embodiment of the present disclosure.

[0062] Figure 2B In the differential relay protection device 1000, and Figure 2A The same components will not be described again. Those skilled in the art will understand that... Figure 2B Some configurations of the differential relay protection device 1000 and differential relay protection device 2000 (e.g., clock module 1100) can be replaced with Figure 1B The configuration of the differential relay protection device 1001 shown (e.g., first clock module 1101 and second clock module 1102). Figure 2B As shown, the power data acquisition module 1200 obtains power data from the external merging unit (MU) 3200 of the substation 3000. The external merging unit 3200 can be an intelligent component within the substation, a physical unit used to perform time-related combination of current and voltage data from the secondary converter. The external merging unit 3200 can be a component of the instrument transformer or a discrete unit. The external merging unit 3200 can merge and synchronize the electrical quantities sent by the primary instrument transformer, and forward the processed digital signal to the bay-level equipment according to a specific format. In other words, the external merging unit 3200 can collect power data from the power system and send the collected power data to the power data acquisition module 1200.

[0063] External merging unit 3200 can acquire power data based on the second clock 1120. For example, when power data is acquired by external merging unit 3200, the second clock and external merging unit 3200 can be timed by the substation master clock. When the second clock 1120 and external merging unit 3200 are timed by the substation master clock 3100, the substation master clock 3100 can use either the PTP domain or the Inter-Range Instrument Group-B code (IRIG-B) to time the second clock 1120 and external merging unit 3200. For example, the substation master clock 3100 can be in a different PTP domain than the first clock 1110, separate from the PTP domain of the second clock 1120 and external merging unit 3200. Figure 2B (Not shown in the image). The substation master clock 3100 can be the master clock in the PTP domain where the second clock 1120 and the external merging unit 3200 are located. For example, the substation master clock 3100 can use IRIG-B technology to provide time synchronization to the second clock 1120 and the external merging unit 3200.

[0064] Figure 3 This is a schematic diagram of an electrical device according to an embodiment of the present disclosure. The electrical device may include transformers, transmission lines, etc., but the present disclosure is not limited thereto. Figure 3 As shown, the power equipment 300 may include a differential relay protection device 310. The differential relay protection device 310 may be a reference... Figure 1A-Figure 2B One of the differential relay protection devices described.

[0065] Figure 4 This is a schematic diagram of a relay protection system according to an embodiment of the present disclosure. The relay protection system 400 can be configured in a power system to implement relay protection functions. Figure 4 As shown, the relay protection system 400 may include a differential relay protection device 410 and power equipment 420. The differential relay protection device 410 may be a reference... Figure 1A-Figure 2B One of the differential relay protection devices described. Power equipment 420 can be referenced. Figure 3 The electrical equipment described.

[0066] Figure 5 A flowchart of a method for a differential relay protection device according to an embodiment of the present disclosure is shown.

[0067] like Figure 5 As shown, the method for a differential relay protection device may include steps S510-S540.

[0068] In step S510, a first clock can be created for the differential relay protection device, and the first clock is configured in a precise time protocol domain. For example, this precise time protocol domain can be configured for the differential relay protection function.

[0069] In step S510, a second clock can be created for the differential relay protection device. The second clock operates independently of the first clock. For example, this second clock can be used for power data acquisition.

[0070] In step S530, power data acquired based on the second clock can be obtained. For example, the differential relay protection device can acquire power data based on the second clock either on its own or via an external device.

[0071] In step S540, the differential relay protection function is executed by the first clock.

[0072] Figure 6 This is a schematic diagram of a non-transitory computer-readable medium according to embodiments of the present disclosure.

[0073] like Figure 6 As shown, a non-transitory readable storage medium 600 stores computer instructions 610, which, when executed by a processor, perform one or more steps of the method for a differential relay protection device and its additional aspects as described above.

[0074] For example, the non-temporarily readable storage medium 600 may be any combination of one or more computer-readable storage media, such as a computer-readable storage medium containing program code for performing the various methods described above.

[0075] For example, when the program code is read by a computer, the computer can execute the program code stored in the computer storage medium to perform one or more steps of the various methods and additional aspects described above, such as those according to at least one embodiment of the present disclosure.

[0076] For example, the non-transitory readable storage medium may include a memory card of a smartphone, a storage component of a tablet computer, a hard disk of a personal computer, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), portable compact disc read-only memory (CD-ROM), flash memory, and other non-transitory readable storage media or any combination thereof.

[0077] Embodiments of this disclosure also provide a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform a method for a differential relay protection device according to embodiments of this disclosure.

[0078] According to the differential relay protection device, equipment, system, method, and storage medium disclosed herein, an independent precise time protocol domain can be configured for the differential relay protection function to achieve power data synchronization in a way that is low in hardware cost, low in system architecture complexity, highly flexible, and highly stable in operation, thereby realizing the differential relay protection function.

[0079] Although this disclosure has been described with reference to exemplary embodiments, various changes and modifications may be suggested to those skilled in the art. This disclosure is intended to cover such changes and modifications that fall within the scope of the appended claims.

[0080] Any description in this invention should not be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent application subject matter is defined only by the claims.

[0081] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing at least one executable instruction for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0082] In general, the various exemplary embodiments of this disclosure can be implemented in hardware or dedicated circuitry, software, firmware, logic, or any combination thereof. Some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device. When aspects of embodiments of this disclosure are illustrated or described as block diagrams, flowcharts, or using some other graphical representation, it will be understood that the blocks, apparatuses, systems, techniques, or methods described herein can be implemented as non-limiting examples in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0083] The exemplary embodiments of this disclosure described in detail above are merely illustrative and not restrictive. Those skilled in the art will understand that various modifications and combinations can be made to these embodiments or their features without departing from the principles and spirit of this disclosure, and such modifications should fall within the scope of this disclosure.

Claims

1. A differential relay protection device, comprising: Clock module, the clock module is configured to: A first clock is created for the differential relay protection device, and the first clock is configured in the precision time protocol domain. A second clock is created for the differential relay protection device, and the second clock operates independently of the first clock; The power data acquisition module is configured to acquire power data based on a second clock. as well as The processing module is configured to perform differential relay protection function via the first clock.

2. The differential relay protection device according to claim 1, wherein, The precise time protocol domain is also configured with a first clock for one or more other differential relay protection devices. Among them, one of the first clocks of the one or more other differential relay protection devices and the first clock of the differential relay protection device is set as the master clock of the precision time protocol domain.

3. The differential relay protection device according to claim 1, wherein, The power data acquisition module is configured as follows: Power data is collected locally from the power system based on a second clock at the differential relay protection device.

4. The differential relay protection device according to claim 1, wherein, The power data acquisition module is configured as follows: The power data acquired based on the second clock is obtained from an external merging unit, wherein the power data acquired based on the second clock is acquired by the external merging unit based on the second clock.

5. The differential relay protection device according to claim 2, wherein, The processing module is configured as follows: The power data acquired by the power data acquisition module based on the second clock is converted into first power data based on the first clock. The differential relay protection function is performed using the first power data.

6. The differential relay protection device according to claim 5 further includes a communication module, the communication module being configured to receive second power data based on a first clock from at least a portion of the one or more other differential relay protection devices; in, The processing module is configured as follows: The differential relay protection function is performed using the first power data and the second power data.

7. The differential relay protection device according to claim 5, wherein, The communication module is also configured to send the first power data to at least a portion of the one or more other differential relay protection devices.

8. The differential relay protection device according to claim 1, wherein the second clock is timed by the internal crystal oscillator of the differential relay protection device.

9. The differential relay protection device according to claim 1, wherein, The differential relay protection device is installed in the substation, and the second clock is timed by the main clock of the substation via the clock module.

10. The differential relay protection device according to claim 9, wherein the second clock is timed by the main clock of the substation using one of the precise time protocol domain and the inter-range instrument group-B code via the clock module.

11. A differential relay protection device, comprising: The first clock module is configured as follows: A first clock is created for the differential relay protection device, and the first clock is configured in the precision time protocol domain; The second clock module is configured as follows: A second clock is created for the differential relay protection device, and the second clock operates independently of the first clock; The power data acquisition module is configured to acquire power data based on a second clock. as well as The processing module is configured to perform differential relay protection function via the first clock.

12. An electrical device comprising a relay protection device as described in any one of claims 1-11.

13. A relay protection system, comprising a relay protection device as described in any one of claims 1-11 or a power equipment as described in claim 12.

14. A method for a differential relay protection device, comprising: A first clock is created for the differential relay protection device, and the first clock is configured in the precision time protocol domain. A second clock is created for the differential relay protection device, and the second clock operates independently of the first clock; Obtain power data based on a second clock; as well as Differential relay protection function is executed via the first clock.

15. A computer-readable storage medium having stored thereon computer-executable instructions, which, when executed by a processor, are used to implement the method of claim 14.

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