Digital relay protection power distribution terminal device and operation method thereof

Abstract

The invention discloses a relay protection power distribution terminal device and an operation method thereof.The device comprises a shell, a CPU board, a first terminal communication channel and a second terminal communication channel, and the CPU board is arranged in the shell and connected with an acquisition unit installed on a switch circuit breaker through the first terminal communication channel and the second terminal communication channel; switch circuit breaker messages acquired by an acquisition unit are independently acquired, and the messages are simultaneously transmitted in a first terminal communication channel and a second terminal communication channel in a double-rule manner by adopting a data block interleaving and redundancy transmission technology; and the CPU board runs a relay protection program, verifies and reconstructs the messages obtained through the first terminal communication channel and the second terminal communication channel, identifies a distribution line fault, and controls tripping when the distribution line has a fault. According to the invention, the reliability of transmitting the message by using the cable is improved, and the occurrence of maloperation caused by the fact that the relay protection power distribution terminal cannot receive the correct message when the power distribution line fails is reduced, so that the anti-interference performance and the reliability of the digital relay protection power distribution terminal are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of relay protection, and relates to a digital relay protection power distribution terminal device and an operation method thereof. Background Art

[0002] Relay protection is the first line of defense for maintaining the safe and stable operation of the power system. It is necessary to quickly and reliably cut off system faults that endanger the safety of the power grid. Currently, relay protection functions are also widely configured in the distribution terminals used in the distribution network.

[0003] With the development of technology, the primary equipment of the distribution system, including switch circuit breakers, voltage transformers, current transformers, etc., has shown a trend of deep integration, that is, the voltage transformer and the current transformer are integrated into the pole of the switch circuit breaker, rather than being hung outside the switch circuit breaker. In this case, the output power of the voltage transformer and the current transformer will be reduced, so it is converted into a small signal output. Generally, the rated value of the secondary output voltage of the original external transformer is 100V, and the rated value of the secondary output current of the current transformer is 1A; after adopting the small signal output, the rated value corresponding to the rated voltage of the secondary output of the voltage transformer is converted to 3.25V, and the secondary output of the current transformer is also converted to a small voltage signal, and the corresponding rated value is 1V. Since the signal amplitude of the secondary output of the transformer is much smaller than that of the external type, and it has to pass through a 6-15 meter long cable to be transmitted to the relay protection distribution terminal, if it is interfered by the electromagnetic field in space, the measured value will change relatively greatly, which will increase the risk of relay protection misoperation.

[0004] In view of the fact that the direct transmission of small transformer signals is easily interfered with, some manufacturers have adopted a digital signal transmission solution, that is, using a collection device installed on the switch circuit breaker to convert the transformer small signal into a digital quantity, and transmit the sampled value to the relay protection distribution terminal through a message, thus becoming a digital relay protection distribution terminal. Since a check code is set in the message, if the message is interfered with during transmission and causes an error in the message, the error can be determined based on the check code, so that the wrong data will no longer be used, so as to prevent the risk of false operation of the relay protection distribution terminal due to interference in the transmission link.

[0005] The digital signal transmission scheme has been applied in substations. After the local sampling unit collects voltage, current and other signals, it converts them into digital signals and sends them to the relay protection device through the optical fiber channel using standardized protocol messages. Figure 1 As shown, Figure 1In the figure, CB is a switch, MU is a local sampling unit installed on CB, RLY is a relay protection device, and FB is a transmission optical fiber between the local sampling unit and the relay protection device. Compared with the traditional signal transmission method, this device uses optical signals to transmit information in optical fibers. Optical signals will not be interfered by the electromagnetic field in space, so the stability of message transmission is good. However, relay protection distribution terminals are used in distribution networks, and there are many long-term outdoor operations. If optical cables are used for transmission, the corresponding optical components are more easily damaged outdoors. Therefore, manufacturers who use digital signal transmission solutions believe that replacing optical cables with electrical cables, that is, using cables to transmit messages through electrical signals is more suitable, less prone to damage, and longer life. Therefore, electrical cables are used instead of optical cables. Figure 2 As shown, Figure 2 In the figure, CB is a switch, MU is an on-site sampling unit, MU is installed on CB, FTU is a relay protection distribution terminal device, MU and FTU are connected and communicated through two cables RX and TX, where RX is the cable used by FTU to receive signals, and TX is the cable used by FTU to send signals. Although using cables to transmit digital signals can increase the service life, the cables use electrical signals when transmitting messages. Electrical signals are easily interfered by electromagnetic fields in space and are not as stable as optical signals. When the transmitted messages are interfered with, errors may occur in the transmitted messages. At this time, although the error of the transmitted message can be verified by the check code instead of using the error message, the error message may also be the message sent when the distribution network fails. In particular, when the distribution network fails, it is the time when the electromagnetic field is most seriously affected by the electromagnetic transient process. At this time, if the error message caused by interference is discarded, it is easy to cause the relay protection distribution terminal to fail to receive the fault quantity due to the error of the message, and thus fail to perform fault judgment to remove the fault, resulting in the failure of the relay protection. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a digital relay protection terminal device and an operating method thereof, so as to avoid interference when using cables to transmit digital signals, which may easily lead to failure of the relay protection distribution terminal to operate.

[0007] The present invention adopts the following technical solution.

[0008] The first aspect of the present invention provides a relay protection power distribution terminal device, comprising a housing, a CPU board, a first terminal communication channel, a second terminal communication channel and a collection unit, wherein the collection unit is installed on a switch circuit breaker, and is characterized in that:

[0009] The CPU board is placed inside the housing and connected to a collection unit installed on the switch circuit breaker through a first terminal communication channel and a second terminal communication channel, respectively, to independently obtain switch circuit breaker messages collected by the collection unit, and the messages are transmitted simultaneously in the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology in dual protocol;

[0010] The CPU board runs a relay protection program to verify, reorganize and identify distribution line faults of messages transmitted by the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology, and control tripping when a distribution line fault occurs.

[0011] Preferably, the number of the acquisition unit is one, and a first acquisition end communication channel and a second acquisition end communication channel are provided. The first acquisition end communication channel and the second acquisition end communication channel are respectively connected to the first terminal communication channel and the second terminal communication channel to independently transmit messages.

[0012] Preferably, there are two collection units, namely a first collection unit and a second collection unit, and the first collection unit is provided with a first collection unit communication channel, and the second collection unit is provided with a second collection unit communication channel, and the first collection unit communication channel and the second collection unit communication channel are respectively communicatively connected with the first terminal communication channel and the second terminal communication channel to independently transmit messages.

[0013] Preferably, the first acquisition unit and the second acquisition unit are installed at different positions on the switch breaker.

[0014] Preferably, the dual protocol simultaneous transmission means that the message is transmitted simultaneously in the first terminal communication channel and the second terminal communication channel using different protocols.

[0015] Preferably, the data block interleaving transmission technology refers to the first terminal communication channel and the second terminal communication channel dividing the message into data blocks and transmitting them in an interleaved sequence.

[0016] Preferably, the data block redundant transmission technology means that the first terminal communication channel and / or the second terminal communication channel divides the message into data blocks for transmission, and each data block is transmitted at least twice in each frame of the message.

[0017] Preferably, the first terminal communication channel and the second terminal communication channel can simultaneously adopt data block interleaving and redundant transmission technology, specifically:

[0018] The first terminal communication channel and the second terminal communication channel divide the message into data blocks for transmission, and each data block is transmitted at least twice in each frame message and is transmitted in an interleaved order.

[0019] Preferably, the relay protection program verifies the messages transmitted by the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology. If the message verification of one channel fails while the message verification of the other channel is normal, the message with normal verification is parsed to identify the distribution line fault.

[0020] If both messages are checked to be normal, then either message is analyzed to identify the distribution line fault;

[0021] If both message checks are wrong, the parts of the two messages that are checked normally will be reassembled. If the correct complete message can be reassembled, the reassembled message will be used to identify the distribution line fault. If both message checks are wrong and the correct complete message cannot be reassembled, the protection will be locked and a verification prompt message will be issued.

[0022] Preferably, the relay protection program controls tripping when a distribution line fails by directly driving the tripping relay outlet configured by the device to trip; or, transmitting the tripping signal to the collection unit on the switch circuit breaker via the first terminal communication channel and the second terminal communication channel using communication messages, and the collection unit verifies and parses the message and then drives its built-in relay to trip.

[0023] A second aspect of the present invention provides an operation method according to the relay protection power distribution terminal device, comprising:

[0024] The CPU board obtains the switch circuit breaker message collected by the collection unit on the switch circuit breaker through the first terminal communication channel and the second terminal communication channel respectively, and adopts data block interleaving and redundant transmission technology to transmit the message simultaneously in dual protocol;

[0025] The CPU board runs the relay protection program to check, reorganize and identify distribution line faults of the messages transmitted through the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology, and control tripping when a distribution line fault occurs.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention adopts dual communication channels to transmit messages. When one communication channel of the relay protection distribution terminal device is disturbed and causes message verification errors, another undisturbed transmission cable can be used to obtain correct messages for relay protection program calculations, which can improve the probability of obtaining correct messages; and by using different protocols for dual communication channels, using staggered transmission of message contents, increasing the redundancy of transmission data blocks, and combining staggered sequence with redundant transmission, the reliability of using cables to transmit messages is further improved, and the occurrence of malfunctions caused by the relay protection distribution terminal not being able to receive correct messages when a distribution line fails is reduced, thereby improving the anti-interference and reliability of the digital relay protection distribution terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the information transmission by optical cable between the acquisition unit and the relay protection device in the prior art;

[0029] Figure 2 It is a schematic diagram of the information transmission by the cable between the acquisition unit and the relay protection distribution terminal device in the prior art;

[0030] Figure 3 It is a schematic diagram of a relay protection distribution terminal with two communication channels;

[0031] Figure 4 It is a schematic diagram of a relay protection distribution terminal connected to a dual communication channel acquisition unit through two channels;

[0032] Figure 5 It is a schematic diagram of a relay protection distribution terminal connected to two single communication channel acquisition units through two channels;

[0033] Figure 6 It is a schematic diagram of a dual communication channel interleaving content transmission message;

[0034] Figure 1-Figure 5 The figures are marked as: A-housing, B-CPU board, C-first terminal communication channel, D-second terminal communication channel, CB-switch breaker, E-first acquisition end communication channel, F-second acquisition end communication channel, MU1-first acquisition unit, MU2-second acquisition unit, G-first acquisition unit communication channel, H-second acquisition unit communication channel. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0036] like Figure 3 As shown, Embodiment 1 of the present invention provides a relay protection power distribution terminal device, comprising a housing A, a CPU board B, a first terminal communication channel C and a second terminal communication channel D for communication, and a collection unit, wherein the collection unit is installed on a switch circuit breaker CB;

[0037] The CPU board B is placed inside the housing A, and is connected to a collection unit installed on the switch circuit breaker CB through the first terminal communication channel C and the second terminal communication channel D, respectively, so as to independently obtain the switch circuit breaker CB message collected by the collection unit. The message adopts data block interleaving and redundant transmission technology in the first terminal communication channel C and the second terminal communication channel D, and is transmitted simultaneously in dual protocol;

[0038] The CPU board runs the relay protection program, receives the switch circuit breaker message (including analog signal and switch signal) independently uploaded by the first terminal communication channel C and / or the second terminal communication channel D using data block interleaving and redundant transmission technology, verifies and reorganizes it, and parses the message to obtain the transmitted analog quantities such as voltage and current, as well as switch quantity signals such as trip position, closing position, spring no energy storage, and low tripping and closing pressure on the switch, and uses the analog quantities and switch quantities obtained by analysis to implement the relay protection algorithm, identify distribution line faults, and trip when a fault occurs.

[0039] More preferably, if Figure 4 As shown, the acquisition unit is an acquisition unit MU2Port installed on the switch circuit breaker CB, which is provided with a first acquisition end communication channel E and a second acquisition end communication channel F. The first acquisition end communication channel E is connected to the first terminal communication channel C through the receiving cable RX1 of the first communication cable and the sending cable TX1 of the first communication cable, and the second acquisition end communication channel F is connected to the second terminal communication channel D through the receiving cable RX2 of the second communication cable and the sending cable TX2 of the second communication cable, forming communication channels for independent signal transmission. In specific implementation, Figure 4In the process, the acquisition unit MU2Port acquires analog quantities such as voltage and current of the switch circuit breaker, as well as switch quantity signals such as trip position, closing position, spring unstored energy, and low trip and closing pressure, and converts them into digital signals and sends them to the relay protection distribution terminal device through messages. The acquisition unit MU2Port has two communication channels, and each of the two communication channels sends a message. The analog quantity and switch quantity information contained in the message are the same.

[0040] The relay protection distribution terminal with two communication channels is connected to the two communication channels of the acquisition unit through two cables. The two messages sent by the acquisition unit are received. The CPU board determines whether the message has been interfered during the transmission process. If one of the messages has been interfered and caused a verification error, the other message that is not interfered with is parsed and used for the relay protection program to run. When the relay protection program determines that the distribution line fault requires tripping, if the tripping relay configured in the relay protection distribution terminal trips, the tripping relay outlet is directly driven to trip; if the message is sent to the switch circuit breaker to realize the tripping, the tripping signal is used as a communication message, and the message is transmitted to the acquisition unit on the switch circuit breaker through two communication channels. After the acquisition unit parses the message, it drives its built-in relay to trip. The acquisition unit will also verify whether the two communication messages have caused errors due to interference, and only execute the tripping command in the message with correct verification. When one of the communication cables is disturbed and an error occurs, the message transmitted by another undisturbed cable can be used to perform relay protection judgment, receive tripping commands, etc., thereby improving the anti-interference and reliability of the digital relay protection distribution terminal.

[0041] More preferably, if Figure 5 As shown, the number of the acquisition units is two, which are the first acquisition unit MU1 and the second acquisition unit MU2 installed on the switch circuit breaker CB, and each has a communication channel, that is, the first acquisition unit MU1 and the second acquisition unit MU2 are respectively provided with the first acquisition unit communication channel G and the second acquisition unit communication channel H, and the first acquisition unit communication channel G and the second acquisition unit communication channel H are respectively connected to the first terminal communication channel C and the second terminal communication channel D for communication, forming communication channels for independently transmitting signals. The first acquisition unit MU1 and the second acquisition unit MU2 are installed at different positions on the switch circuit breaker. The first acquisition unit MU1 and the second acquisition unit MU2 can receive the tripping command output sent by the relay protection distribution terminal device from the first terminal communication channel C and the second terminal communication channel D through their respective independent communication channels, and the switch circuit breaker where the tripping is tripped is tripped. In specific implementation, Figure 5In the example, MU1 and MU2 each only need one communication channel, and the relay protection distribution terminal with two communication channels is connected to the collection units MU1 and MU2 respectively through two communication cables. When the relay protection program determines that the distribution line fault requires tripping, if it trips through the trip relay configured in the relay protection distribution terminal, the trip relay is directly driven. If a message is sent to the switch relay to trip, the trip signal is transmitted through two communication channels using a communication message to the two collection units on the switch circuit breaker. After parsing the message, the collection unit drives its built-in relay to trip. The collection unit only executes the trip command in the message that has been verified to be correct. In order to improve anti-interference performance, the collection units MU1 and MU2 are preferably installed at different positions on the switch circuit breaker and keep a certain distance. Relative to Figure 4 , Figure 5 The acquisition unit is also independent and has stronger anti-interference performance.

[0042] Based on the above scheme, it can be known that the relay protection distribution terminal of the present invention has two channels located on the switch circuit breaker. A collection unit with two communication channels can be used on the switch circuit breaker, or two collection units can be installed on the switch circuit breaker to form two communication channels to transmit information respectively; when one message in the two communication channels is interfered and the verification fails, the relay protection program calculation is performed only according to the normal message content of the other channel.

[0043] The above-mentioned acquisition unit can receive the tripping command sent by the relay protection power distribution terminal device and trip the switch circuit breaker where the output is located.

[0044] Further preferably, in order to improve the anti-interference and reliability of the digital relay protection distribution terminal, the first terminal communication channel C and the second terminal communication channel D adopt data block interleaving and redundant transmission technology, and the relay protection program run by the CPU board B verifies, reorganizes and identifies distribution line faults for the messages transmitted by the first terminal communication channel C and the second terminal communication channel D using data block interleaving and redundant transmission technology, and controls tripping when a distribution line fault occurs:

[0045] The dual protocols are transmitted simultaneously, that is, the first terminal communication channel C and the second terminal communication channel D use different protocols to transmit messages.

[0046] Further preferably, after receiving the message, the relay protection program first verifies the message obtained through the first terminal communication channel C and the second terminal communication channel D. If the verification of one of the messages is erroneous, while the verification of the other message is normal, the message with normal verification is analyzed to identify the distribution line fault; if the verification of both messages is normal, any one of the messages is analyzed to identify the distribution line fault; if the verification of both messages is erroneous, the parts of the two messages with normal verification are reorganized, and if the correct and complete message can be reorganized, the reorganized message is used to identify the distribution line fault; if the verification of both messages is erroneous and the correct and complete message cannot be reorganized, the protection is temporarily locked and a verification prompt message is issued.

[0047] Among them, the two-way message check is wrong, and the parts of the two-way messages that are checked normally are reassembled, which includes at least the following situations:

[0048] 1) Reassembly during interleaved transmission of messages: The first terminal communication channel C and the second terminal communication channel D each divide the message obtained by the channel into data blocks and transmit them in an interleaved order. When data block verification errors occur in both messages, the correct data blocks in the two channels are used to reassemble into a correct overall message.

[0049] 2) Reorganization during redundant transmission of data blocks: The first terminal communication channel C and / or the second terminal communication channel D each divide the message obtained by this channel into data blocks and transmit them in a redundant manner. Each data block is transmitted at least twice in each frame message. When the data block verification of both messages is wrong, the normal message data blocks are verified and recombined to obtain the correct overall message. For example, if there is a situation where two or more data parts of the same data block in the same channel are disturbed and the verification is wrong, then the remaining normal message data blocks of the other channel are analyzed and recombined. If there is a situation where a data block of a certain channel is disturbed only once and the verification is wrong, it can be recombined by parsing the normal data blocks of the redundant transmission of this channel, or the normal data blocks of the other channel are recombined. The above two situations may exist in the two messages at the same time.

[0050] 3) Reorganization or data block redundancy and reorganization during message interleaved transmission: the first terminal communication channel C and the second terminal communication channel D each divide the message obtained by this channel into data blocks, and transmit them in an interleaved order and redundant manner. Each data block is transmitted at least twice in each frame of the message, and is transmitted in an interleaved order. When some data blocks are disturbed and the verification is wrong, the remaining message data blocks with normal verification are analyzed and reassembled to obtain the correct overall message.

[0051] The relay protection program controls tripping when the distribution line fails by directly driving the tripping relay outlet configured in the device to trip; or, transmitting the tripping signal to the acquisition unit on the switch breaker through the first terminal communication channel C and the second terminal communication channel D respectively using a communication message, and the acquisition unit verifies and parses the message and then drives its built-in relay to trip. That is, the tripping method can be to trip the switch through the cable through the tripping relay configured in the relay protection distribution terminal device, or to convert the tripping command into a digital quantity, transmit the message to the switch breaker through the communication channel, and then the switch breaker side parses the message and trips.

[0052] Embodiment 2 of the present invention provides an operation method of the above-mentioned relay protection power distribution terminal device. The relay protection power distribution terminal device of the present invention uses dual communication channels to receive messages and perform verification and switching, including the following steps:

[0053] Step 1, the relay protection power distribution terminal device receives two messages through two communication channels;

[0054] The CPU board B obtains the switch circuit breaker CB message collected by the collection unit on the switch circuit breaker CB through the first terminal communication channel C and the second terminal communication channel D respectively, and adopts data block interleaving and redundant transmission technology to simultaneously transmit the message in dual protocol;

[0055] Step 2, CPU board B runs the relay protection program to check, reorganize and identify distribution line faults for the messages transmitted through the first terminal communication channel C and the second terminal communication channel D using data block interleaving and redundant transmission technology, and control tripping when a distribution line fault occurs.

[0056] The relay protection distribution terminal device verifies the correctness of the message. The message is generally sent in a combination of a group of data + a check code. The check code is calculated based on the group of data and a check code is calculated according to a certain algorithm. When one or several of the data in the group change, the check code calculated after the change will be inconsistent with the original check code, thereby judging that the group of data has changed. Therefore, if the message is disturbed during transmission and the data is changed, the check code in the message will fail the check, that is, the check is wrong.

[0057] If both message verifications are correct, one of the messages is selected, and the analog information such as voltage and current and the switching information such as tripping position, closing position, spring no energy storage, low tripping and closing pressure, etc. are analyzed and used for relay protection program calculations; if one message verification fails and the other message is normal, only the normal message is used for relay protection program calculations, and the other message that fails the verification is discarded.

[0058] During specific implementation, the communication cable used to transmit messages is an internal protocol formulated by the manufacturer itself, or it may use the IEC61850 protocol, an international standard in the field of power system automation, for example, transmitting messages in the format specified by the IEC-60044-8 protocol and the IEC-61850-9-2 protocol.

[0059] In the above-mentioned dual communication channel message receiving processing flow, compared with the case of single-channel message receiving, the probability of obtaining a correct message will be increased, but there is still a situation where the messages received by both communication channels fail the verification. In this case, if no processing is done, the status information during this period can only be discarded and temporarily locked for protection; in order to improve the anti-interference ability of dual communication channel message reception, some improvements can be further made in the specific implementation, and there are the following improvement measures.

[0060] (1) Use dual-protocol simultaneous transmission technology. That is, two communication channels use different protocols to transmit information. For example, one communication channel uses the IEC-60044-8 protocol and the other communication channel uses the IEC-61850-9-2 protocol. Since different protocols have different data transmission formats and message transmission mechanisms, when interference occurs, it is possible that both messages will not fail verification due to interference.

[0061] (2) Use message interleaving transmission and reorganization technology. That is, the data content transmitted by the two communication channels is organized in an interleaved order and then transmitted separately. It is more common for digital relay protection distribution terminal devices to use the IEC-60044-8 protocol to transmit messages. The IEC-60044-8 protocol transmission message complies with the FT3 frame format, that is, the data is treated as 8 16-bit data + 1 16-bit check code as a data block. If 24 16-bit data need to be transmitted, 3 data blocks are required to be combined into a complete message frame for transmission. When using dual communication channels, in order to prevent interference at the same time that causes both data channels to be completely unavailable, a frame of data sent by the two channels is interleaved according to a certain rule and then sent separately, such as Figure 6 As shown, Figure 6 In the figure, Block1~Block3 are data blocks transmitted in the first channel of the dual communication channels, Block1'~Block3' are data blocks transmitted in the second channel of the dual communication channels. The figure only shows the data-related parts, and other information in the message, such as the message header flag and the message tail flag, is not drawn. D01~D24 in the figure are 24 data, C1~C3, C1'~C3' are the check codes of each data block. Assume that the two channels are interfered at the same time when the first data block is transmitted, such as Figure 6Due to the DISTURB signal in the transmission, the first data blocks transmitted by the two channels cannot be verified and cannot be used. However, when the second and third data blocks are transmitted, the interference has passed. Moreover, due to the use of the interleaved content transmission method, the correct second and third data blocks in the first channel and the second channel can be reassembled into a complete frame of correct data, thereby achieving the effect of improving anti-interference.

[0062] (3) Adopt data block redundant transmission and reassembly technology. That is, increase the redundancy of the transmitted data block, and transmit the data block at least twice in one frame of message. Still combined with the characteristics of IEC-60044-8 protocol message transmission, for the case of short-term interference, if the short-term interference only affects one or part of the data block, if the redundant transmission processing method is adopted during transmission, for example, each data block is sent twice, for example, one frame of message uses the transmission content of Block1, Block2, Block3 + the second Block1, Block2, Block3, when the two data parts of the same data block are interfered and the verification is not out of date, the whole message can still be obtained by parsing the remaining message data blocks with normal verification and reassembling, thereby achieving the effect of improving the anti-interference. However, after increasing the redundancy, it is equivalent to doubling the amount of data that needs to be sent in each frame of message. In order to complete the message transmission within the specified time, it may be necessary to increase the transmission speed accordingly. Therefore, if it is necessary to further increase the redundancy, for example, each data block in each frame of message is transmitted 3 times or more, the transmission speed needs to be further increased accordingly. The data block redundant transmission and reassembly technology is not limited to being used with two channels, and the technology is also effective with a single channel.

[0063] (4) Adopt data block redundancy and message interleaving transmission and reorganization technology. That is, combine message interleaving transmission technology with data block redundancy transmission technology, adopt dual communication channels, and use redundant data content transmitted by each communication channel. The data content transmitted by the two communication channels is organized in an interleaved order and transmitted separately. This can achieve a multiple redundancy effect, and the anti-interference effect will be stronger.

[0064] After adopting the above scheme, when one of the transmission cables is disturbed and causes a message check error, another undisturbed transmission cable can be used to obtain the correct message for relay protection program calculation; when part of the data block is disturbed and causes a message check error, the redundant undisturbed data block can be used to restore the data. This improves the reliability of using cables to transmit messages, reduces the occurrence of false operation of the relay protection distribution terminal due to the failure to receive the correct message when the distribution line fails, and thus improves the anti-interference and reliability of the digital relay protection distribution terminal.

[0065] The beneficial effects of the present invention are as follows:

[0066] The present invention adopts dual communication channels to transmit messages. When one communication channel of the relay protection distribution terminal device is disturbed and causes message verification errors, another undisturbed transmission cable can be used to obtain correct messages for relay protection program calculations, which can improve the probability of obtaining correct messages; and by using different protocols for dual communication channels, using staggered transmission of message contents, increasing the redundancy of transmission data blocks, and combining staggered sequence with redundant transmission, the reliability of using cables to transmit messages is further improved, and the occurrence of malfunctions caused by the relay protection distribution terminal not being able to receive correct messages when a distribution line fails is reduced, thereby improving the anti-interference and reliability of the digital relay protection distribution terminal.

[0067] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0068] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0069] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0070] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A relay protection power distribution terminal device, comprising a housing, a CPU board, a first terminal communication channel, a second terminal communication channel and a collection unit, wherein the collection unit is installed on a switch circuit breaker, and is characterized in that: The CPU board is placed inside the housing and connected to a collection unit installed on the switch circuit breaker through a first terminal communication channel and a second terminal communication channel, respectively, to independently obtain switch circuit breaker messages collected by the collection unit, and the messages are transmitted simultaneously in the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology in dual protocol; The CPU board runs a relay protection program to verify, reorganize and identify distribution line faults of messages transmitted by the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology, and control tripping when a distribution line fault occurs.

2. A relay protection power distribution terminal device according to claim 1, characterized in that: The number of the acquisition unit is one, and a first acquisition end communication channel and a second acquisition end communication channel are provided. The first acquisition end communication channel and the second acquisition end communication channel are respectively connected to the first terminal communication channel and the second terminal communication channel to transmit messages independently.

3. A relay protection power distribution terminal device according to claim 1, characterized in that: There are two collection units, namely a first collection unit and a second collection unit, and the first collection unit is provided with a first collection unit communication channel, and the second collection unit is provided with a second collection unit communication channel. The first collection unit communication channel and the second collection unit communication channel are respectively communicatively connected to the first terminal communication channel and the second terminal communication channel to independently transmit messages.

4. A relay protection power distribution terminal device according to claim 3, characterized in that: The first acquisition unit and the second acquisition unit are installed at different positions on the switch breaker.

5. A relay protection power distribution terminal device according to claim 1, characterized in that: The dual protocol simultaneous transmission means that messages are transmitted simultaneously in the first terminal communication channel and the second terminal communication channel using different protocols.

6. A relay protection power distribution terminal device according to claim 1, characterized in that: The data block interleaving transmission technology refers to the first terminal communication channel and the second terminal communication channel dividing the message into data blocks and transmitting them in an interleaved order.

7. A relay protection power distribution terminal device according to claim 1, characterized in that: The data block redundant transmission technology means that the first terminal communication channel and / or the second terminal communication channel divides the message into data blocks for transmission, and each data block is transmitted at least twice in each frame of the message.

8. A relay protection power distribution terminal device according to claim 1, characterized in that: The first terminal communication channel and the second terminal communication channel can simultaneously adopt data block interleaving and redundant transmission technology, specifically: The first terminal communication channel and the second terminal communication channel divide the message into data blocks for transmission, and each data block is transmitted at least twice in each frame message and is transmitted in an interleaved order.

9. A relay protection power distribution terminal device according to claim 1, characterized in that: The relay protection program verifies the messages transmitted by the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology. If the message verification of one channel fails while the message verification of the other channel is normal, the message with normal verification is parsed to identify the distribution line fault. If both messages are checked to be normal, then either message is analyzed to identify the distribution line fault; If both message checks are wrong, the parts of the two messages that are checked normally will be reassembled. If the correct complete message can be reassembled, the reassembled message will be used to identify the distribution line fault. If both message checks are wrong and the correct complete message cannot be reassembled, the protection will be locked and a verification prompt message will be issued.

10. A relay protection power distribution terminal device according to claim 1, characterized in that: The relay protection program controls tripping when a distribution line fails by directly driving the trip relay outlet configured by the device to trip; or transmitting the trip signal to the collection unit on the switch circuit breaker via the first terminal communication channel and the second terminal communication channel using communication messages, and the collection unit verifies and parses the message and then drives its built-in relay to trip.

11. An operating method of the relay protection power distribution terminal device according to any one of claims 1 to 10, characterized in that: The method comprises: The CPU board obtains the switch circuit breaker message collected by the collection unit on the switch circuit breaker through the first terminal communication channel and the second terminal communication channel respectively, and adopts data block interleaving and redundant transmission technology to transmit the message simultaneously in dual protocol; The CPU board runs the relay protection program to check, reorganize and identify distribution line faults of the messages transmitted through the first terminal communication channel and the second terminal communication channel using data block interleaving and redundant transmission technology, and control tripping when a distribution line fault occurs.

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