JP5782832B2 - Remote maintenance device for digital protective relay system - Google Patents

Description

  The present invention relates to a remote maintenance device for a digital protection relay system, and more particularly to remote maintenance of a terminal device for a ring system protection relay.

  FIG. 8 shows a configuration diagram of a ring system protection relay system (hereinafter referred to as a loop relay). The loop relay includes a central device 1 installed in the substation 3 and power from the substation 3 through the loop system. It is comprised with the some terminal device 2 installed in consumers, such as a building and a factory supplied. The current information of the terminal device 2, the device information such as the circuit breaker CB, and the presence / absence information of the device abnormality are sent to the central device 1 through the transmission path 5 made of an optical fiber or the like. It is configured to be able to confirm.

  However, there is a limit to the amount of information transmitted, and detailed information processed by each arithmetic processing unit CPU of the terminal relay unit provided in each terminal device 2 (response history at CB trip, analog input amount at abnormality, The information prepared for maintaining the device, such as recording of events such as DI / O output, etc.) is not sent over the transmission line 5 by the optical fiber because of the amount of information and real-time constraints. There is a maintenance problem that, when a problem occurs, it is necessary to enter the consumer and check with the terminal device 2. The loop relay has a configuration in which a maximum of 10 terminal devices are connected, and when checking the state of each customer terminal, it takes a lot of work time and affects the power system protection stop time.

  Patent Document 1 is publicly known as a solution to the above-described maintenance problem. As shown in FIG. 9, this patent document 1 transmits data obtained by sampling the detailed information of the terminal device 2 to the demultiplexing unit, and transmits the data sampled by the demultiplexing unit of the terminal device 2 to the loop line. Multiplexed on unused channels in the frame format, transmitted to the central device 1 via the transmission line 5, and collected and monitored the detailed data of each terminal device 2 by the central device 1, thereby solving the maintenance problem. Is.

  The transmission frame format used in Patent Document 1 has the frame configuration shown in FIG. 10, and Patent Document 2 is used as a specific method for the communication method and demultiplexing processing.

JP2011-55660 Japanese Patent No. 2689508

  Incidentally, a system configuration as shown in FIG. 11 exists as a system configuration requiring a maintenance function. FIG. 6A shows a case where the personal computer PC as a terminal and the protective relay Ry are configured. When maintenance is performed, the personal computer PC accesses the processing unit CPU1 of the protective relay Ry in the terminal mode and refers to the memory of the CPU1. Rewrite.

FIG. 11B shows a case where a plurality of processing units CPU1 and CPU2 are provided as the protective relay Ry. The personal computer PC accesses the processing unit CPU1 of the protective relay Ry in the terminal mode and performs rewriting while referring to the memory of the CPU1. Further, there is a need to perform rewriting while referring to the memory of the processing unit CPU2.
In FIG. 11C, the protective relay Ry includes a plurality of RyA and RyB, the personal computer PC and RyA, and RyA and RyB are connected by different coupling methods (CPU bus or communication circuit), and further the processing unit CPU2 -A remote maintenance function may be required also for CPU6.

  The purpose of the present invention is particularly applicable to a case where a remote maintenance function is required in a system configured by different coupling methods as shown in FIG. 11C, and can handle a large amount of information. A digital maintenance relay system remote maintenance device is provided.

Claim 1 of the present invention connects a central device and a plurality of terminal devices via a loop line and a communication processing unit included in each terminal device, and the data obtained by the terminal relay unit of each terminal device is transmitted to the central device. A digital protection relay system that performs a protection operation by inputting to a central relay unit of the terminal, wherein a plurality of processing unit CPU memories are provided in the terminal relay unit of each terminal device, and the bus B1 is connected among the plurality of processing unit CPU memories. The processing unit CPU memory that is directly connected to the communication processing unit via the bus B2 having a coupling method different from the bus B1 is connected between the plurality of processing unit CPU memories, and the communication processing unit is connected to the bus B1. are connected via a processing unit CPU memory that is, to those collected in the central unit the data recorded in the respective processing unit CPU memory connected with different coupling system and a terminal connected to the central unit Stomach,
The central device and each terminal device are provided with an SDLC line unit capable of one-to-N (plurality) communication, and a function for selecting the processing unit CPU of the terminal device and a function for the selected processing unit CPU are provided in the SDLC line unit. A remote maintenance function having a read / write function is installed, and the processing unit CPU memory selected by the terminal is read / written via the SDLC line unit,
An accessible area is provided in advance in the memory area of the processing unit CPU, a read / write prohibited area for the remote maintenance function is provided, a restriction that cannot be read for an area that cannot be read by the remote maintenance function, and writing is performed. This is characterized in that a restricted area that cannot be written is provided for an area that should not be done.

According to a second aspect of the present invention, a history buffer area is provided in the processing unit CPU memory, and when data is rewritten by the remote maintenance function, data in the rewrite memory area is saved to the history buffer area and it is determined whether or not there is a write change. If the write is permitted, the process ends. If the write is not permitted and the communication line is abnormal, the saved data in the history buffer area is restored to the original area.

According to a third aspect of the present invention, an identification display of the terminal device of the communication destination and the processing unit CPU is added to the man-machine interface of the terminal, and the added identification display is displayed at a prompt of the terminal. Is.

Claim 4 of the present invention, the remote maintenance function, the unique number of the terminal device, the board number for specifying the processing unit CPU, is obtained by, characterized in that cause address, and identifiably displays the number of data .

The fifth aspect of the present invention is characterized in that the remote maintenance function has a function of recognizing a serial number indicating the continuity of processing between the processing units CPU of the terminal device and final data. .

As described above, according to the present invention, the central device and each terminal device are provided with an SDLC line unit capable of 1-to-N communication and are equipped with a remote maintenance function, and a plurality of arbitrary terminal relay units are selected from the central device. It is possible to do.
As a result, it is possible to read and write on the memory map for a plurality of processing units CPU of the remote terminal relay unit, and without having to enter a remote facility at the time of maintenance, the terminal device installed in the remote place The processing unit CPU status can be grasped.

The block diagram which shows embodiment of this invention. The information acquisition explanatory drawing of a terminal device. Remote maintenance execution explanatory drawing. Memory map for explanation. Memory map for explanation. The flow chart of data evacuation. data format. The remote maintenance block diagram in the protection relay system of a ring line system. Protective relay system diagram of the ring line system. Frame configuration diagram. Functional explanatory diagram of remote maintenance.

  The present invention provides a communication line SDLC based on a data link control protocol, is equipped with a remote maintenance function, selects a plurality of processing unit CPUs of a remote terminal relay unit, and the selected processing unit CPU The memory map can be read and written.

FIG. 1 shows a configuration diagram of a loop relay to which the present invention is applied, and corresponds to a case where the remote maintenance function of FIG. 11C is required.
A central device 1 installed in a substation has a central relay unit 1a and a transmission / reception unit 1b.
The central apparatus 1 is connected to a personal computer PC (hereinafter referred to as a terminal), and exchanges signals with terminal software (terminal mode) via an interface such as RS232C.
Further, between the central apparatus 1 and the N terminal apparatuses 2, downlink communication from the central apparatus 1 to the terminal apparatus 2 and uplink communication from the terminal apparatus 2 to the central apparatus 1 are N lines (1 to N lines). ) Are prepared and multiplexed and transmitted on serial data in the transmission format.

  The central relay unit 1a of the central device 1 includes a processing unit 10 that performs signal relay processing with the transmission / reception unit 1b, and a protection calculation processing unit 11 that performs protection calculation. The transmission / reception unit 1b includes a communication processing unit 12, an SDLC line unit 13, a multiplexing unit 14, a demultiplexing unit 15, an uplink transmission unit 16a, a reception unit 16b, and a downlink transmission unit 17a and a reception unit 17b. ing. Between the central device 1 and the N terminal devices 2, N-line communication is prepared for downlink communication from the central device 1 to the terminal device 2 and uplink communication from the terminal device 2 to the central device 1. Multiplexed on serial data.

  Each of the plurality of terminal devices 2 includes a terminal relay unit 2a and a transmission / reception unit 2b, and the terminal relay unit 2a collects electrical equipment information installed in a consumer and performs a processing calculation on the plurality of processing units CPU1 to CPU1. 4. The transmission / reception unit 2b includes a multiplexing unit 24, a demultiplexing unit 25, transmission units 26a and 27a, and reception units 26b and 27b, and further includes an SDLC line unit 23 added according to the present invention. That is, the apparatus configuration of the present invention is the one in which the SDLC line unit 23 is added as shown by the dotted line in place of the functional part of the line control unit 41 in FIG. 9, and the loopback control and monitoring of the communication unit of the terminal are performed. An SDLC line unit 23 for remote maintenance function is further added to the communication processing unit 22 to be performed, and the communication processing unit 22 realizes the remote maintenance function by software as shown in FIG.

As a transmission format used in the present invention, data for the remote maintenance function is multiplexed on unused channels CH18 to CH28 in channels CH1 to CH28, for example, unused channels of CH26.
Using the newly added bit synchronization line of the SDLC line unit 23, communication is made with the terminal relay unit 2a via the communication processing unit 22, and each terminal device 2 is looped with N nodes that are characteristic of SDLC. Communication processor 22 and communication processor 12 of central device 1
Are connected, and in order to realize a remote maintenance function between the central apparatus 1 and each terminal apparatus 2, data is transferred using the SDLC loop transmission function.
In the frame example, the bit multiplex channel is 192 kbps (= 6.312 Mbps / 263 bit × 8 bit) and 192 kbps, which is obtained by dividing the transmission rate (6.312 Mbps) of the entire transmission format. The SDLC line can be installed.

  The terminal relay unit 2a of each terminal device 2 is composed of a plurality of processing units CPU1 to CPU4. Each processing unit CPU is equipped with software that implements a remote maintenance function. 1 is configured to be connected via the communication processing unit 22 of the transmission / reception unit 2b as described above. In each transmitting / receiving unit 2b, the communication processing unit 22 and the processing unit CPU1 (or CPU4) are connected by a bus B1, and the processing units CPU2 and CPU3 are connected by a bus B2 that is further different from the processing unit CPU1, and these CPU2, By providing the CPU 3 with a remote maintenance function, all the detailed information stored in the terminal relay unit 2a can be browsed on the terminal PC via the central device upon request, and can be written as necessary.

Further, the communication processing unit 12 of the central apparatus 1 has a man-machine function for realizing remote maintenance, and the maintenance is connected by terminal software of the terminal PC, and the terminal is connected by RS232C 19.2 kbps, 9.6 kbps, etc. Execute access by mode.
The remote maintenance function includes a selection function of each processing unit CPU1 to 4 provided in each remote terminal device 2 and its terminal relay unit 2b, and reading (reading and referencing) on the memory map for the selection CPU. The remote maintenance function is realized by providing the functions of writing (writing, updating) and collecting detailed data of each terminal device 2.

Next, the operation will be described.
When data is collected from the terminal device 2 through the terminal PC and the central device 1, the terminal device 2 that collects data is designated in the terminal PC.
FIG. 2 shows an example of designation. RS1, RS2,... Are identification numbers unique to the terminal device, and “2-3” of RS2-3 is the number of the processing units CPU1 to CPU4 of the terminal relay unit 2a. 0 to 3 are assigned as shown in FIG.
For example, when collecting data of the terminal relay processing unit CPU 4 of the RS 2, when “N2-3” is input from the PC keyboard, the screen of FIG. 2B is displayed. FIG. 2C shows an example of a command for logging in to the remote maintenance function, and is a table showing the designation method of the terminal device and its CPU.

  The terminal device designation signal is input to the multiplexing unit 14 via the communication processing unit 12 and the SDLC line unit 13 of the central device 1, and designates the terminal device 2 to be communicated from the central device 1 via the SDLC line in the loop transmission, and is transmitted. It transmits through the part 16a. The SDLC line unit 23 of the designated terminal device 2 decodes its own device data acquisition designation, collects predetermined data, and returns it to the central device 1 via the communication processing unit 22.

When the communication processing unit 22 of the designated terminal device deciphers that the data of the terminal relay unit 2a is necessary, the communication processing unit 22 transmits the data to the processing unit CPU1 of the terminal relay unit 2a through the bus B1 . When the request data is, for example, data of the CPU 3, the processing unit CPU1 collects data of the CPU 3 (here, the CPU 3 is specified as the processing unit for HDLC) via the high-speed serial bus B2, and returns the data to the communication processing unit 22 To do.
If the acquired data is the CPU 4, the data of the CPU 4 is collected from the processing unit CPU 1 directly via the bus B 1 and returned to the communication processing unit 22. Therefore, the information transmission path changes corresponding to the processing unit CPU that acquires data.

  FIG. 3 shows an embodiment of the maintenance function. Information such as date, event occurrence, abnormality occurrence, error return, etc., addresses of the processing units CPU1 to CPU4 of each terminal relay unit, the number of data, etc. It is written in the format and returned to the terminal PC.

  According to this embodiment, a communication line SDLC based on a data link control protocol is prepared and a remote maintenance function is installed, and a plurality of arbitrary terminal relay units can be selected from the central device. The remote maintenance function installed in the communication function includes a function for selecting a plurality of processing unit CPUs in a remote terminal relay unit, and reading (reading, reference) on the selected processing unit CPU on the memory map. ) And write (write, update) are possible, and it is possible to grasp the state of the processing unit CPU of the terminal device installed at a remote place without entering a remote facility during maintenance.

  In this embodiment, the remote maintenance function is provided with a filter (access via the permission table) in the read / write area, the read is restricted for the read-prohibited area, and the write is restricted for the write-prohibited area. It is something that has

  When supporting with the remote maintenance function of the processing unit CPU, for the access to the memory map of the processing units CPU1 to 4 of the terminal relay unit, prepare a data definition as an access permission table that defines an accessible area at the design time in advance. deep. Even when an arbitrary area is accessed by the remote maintenance function, as shown by the memory area C in the memory map of FIG. 4, only the area defined in the permission table can be accessed.

For example, if the read or write prohibited area is RS1 terminal device, there was an access to RS1> prohibited area. Message is displayed. Alternatively, when access is made to a prohibited area, for example, a method is adopted in which permission is granted for security. RS1> There was an access to the prohibited area. Please enter your password.
If authenticated by entering a password, access is allowed, but if not authenticated, RS1> access is denied. Are displayed on the terminal PC screen.

  This makes it possible to prevent unnecessary access in prohibited areas, such as shared memory behavior, areas that are cleared only by executing read, interrupt factor registers and interrupt generation areas to another processing unit CPU only by access, The original soundness of the system that operates with software can be maintained.

  According to this embodiment, the remote maintenance function is provided with a filter for the read / write area, so that the read prohibition area cannot be read, and the write prohibition area On the other hand, there is a restriction that cannot be written. As a result, it is possible to lock the system so that the continuity of automatic processing of the system due to human error is not hindered. Therefore, by defining a remote accessible area in advance, unnecessary troubles when using the remote maintenance function can be prevented.

In this embodiment, when writing is performed by the remote maintenance function, a function for checking the validity of data rewriting is incorporated so as to have a function of automatically returning when inappropriate.
Normal CPU processing is based on the continuity of periodic processing. While constantly monitoring the input, the processing corresponding to the condition is processed, automatic control processing is performed, and processing is performed or controlled by establishing the output. In that case, a test mode may be provided as a maintenance function, the test mode flag may be set to move from the normal process to the test mode, and the input result may be changed by a person to see the result of the process and the result of automatic control.

  If this action can be performed with the remote maintenance function, there is an advantage that this test can be performed from a distance without entering the site. However, if the line is opened for some reason such as disconnection during this test, it is assumed that the test mode cannot be canceled. For this purpose, a remote maintenance function having a function of automatically returning at the time of such test mode switching is required.

FIG. 5 is a schematic diagram of a function for automatically returning, and FIG. 6 shows the flow.
The CPU process monitors the input in real time and performs the process based on the result. In addition, output is controlled in real time according to the processing result. In such real-time processing, a test mode is set in advance in the part where the function may be changed by the remote maintenance function. When the test mode is entered, it is designed not to update input or output in real time. Is done. During this test mode, the remote maintenance function is used to change the input value or output value to check the response of the device. The operation of the memory in the area that does not operate in real time can be confirmed by human response, so the test mode condition is not required.

  When a write access by the remote maintenance function occurs, the real-time input area or output area is prohibited from being updated by the test mode condition provided in advance. Therefore, when it is determined in step S1 that the test mode is selected, the data in the area (area C in FIG. 4) is temporarily saved and written before writing in step S2. If there are N save data, after N times according to the saving order, the data before the write access is managed and checked for response so that it can be restored to the ring buffer memory together with the write processing history in step S3. .

  In step S4, it is determined whether or not the writing process is cancelled. If there is no cancel, the process ends. If there is a cancellation, the process proceeds to step S5. In step S5, when a response is confirmed by a series of remote maintenance functions and the access result is left as it is, it is left as it is when a normal end command is issued by the remote maintenance function. Or, if you want to return to the original state, when you cancel from the ring buffer memory that manages the data before change stored together with the history of write processing so far by issuing the cancel end command by the remote maintenance function It is possible to return to the state before writing by the remote maintenance function by performing the process of restoring by the reverse procedure (recovery order by cancellation process).

Also, if the line is disconnected while the remote maintenance function is being used due to some failure during execution of the save operation, in step S6, due to a timeout due to the communication disconnection monitoring process in the remote maintenance function, the access before the cancel end command is performed. The process of step S5 for restoring the state is performed.
If the test mode is not set in step S1, the area corresponding to the input is updated in step S7, and the process ends.

According to this embodiment, when writing by the remote maintenance function, a function for checking the validity of data rewriting is incorporated, and when it is inappropriate, a function for automatically returning is provided. Thereby, the response of the system can be confirmed by a human operation by the access provided with the test mode.
In addition, even if the continuity of automatic processing of the system is hindered by the write operation, it can be restored to the original state by preparing a cancellation process, and this restoration is restored even if communication is interrupted during remote maintenance. It becomes possible to do.

  In this embodiment, a remote maintenance function between remote processing unit CPUs is realized by adding an identification display to the processing unit CPU of the communication destination terminal device in the man-machine interface of the terminal PC.

  When remote maintenance is performed using a terminal man-machine interface, a plurality of terminal devices and a plurality of processing unit CPUs in each terminal relay unit are accessed, so that a communication destination can be identified by display on the terminal. It is requested.

  After logging in, it is specified which CPU of which terminal device is connected. Further, the CPU to be connected is designated. In order to indicate which command is designated by the terminal prompt each time, commands as shown in FIGS. 2 and 3 are prepared. For example, the first terminal device in the down direction with respect to the central device 1 is No. 1 and this No. 1 is selected, “RS1>” is displayed. For example, No. 1 terminal device 2 is displayed. When the processing unit CPU3 in the one terminal device is selected, “RS1-2>” is displayed and can be identified.

  According to this embodiment, by adding an identification display to the processing unit CPU of the communication destination in the man-machine interface of the terminal, it is displayed at the terminal prompt when performing remote maintenance, and which CPU is currently connected to Therefore, it is possible to identify whether the remote maintenance function is being implemented and to prevent erroneous operations.

  This embodiment makes it possible to select an arbitrary remote device (device having a device unique number), and to identify a CPU to be accessed by a plurality of CPUs (selection by board number) in the device, and The required number of data can be referred to the address of the designated CPU. Similarly, it is possible to write in a predetermined format to a CPU designated.

  FIG. 7 shows the data format. FIG. 7 (a) is for downlink data, FIG. 7 (b) is for uplink data, 0, 4, 8... On the vertical axis are relative addresses, and the numbers (a) described at addresses 0 to 3 are specific to the terminal device. (B) is a board number, and the terminal relay processing units CPU1 to CPU4 are written with symbols 0, 1, 2, and 3, respectively. (C) is a size, and (d) is a serial number indicating continuity. For example, the last bit is a bit representing the final data. Symbols (e) at addresses 4 to 7 represent reference addresses, and symbols (f) at addresses 12 and 13 represent the number of data. In FIG. 3, (a) selects the corresponding terminal device as “RS1”, (b) selects the CPU 2 as “−1”, (e) starts from the address “a400ab58”, (f ) Corresponds to the meaning of referring to “a0” pieces, and is displayed on each predetermined part. Uplink data is displayed in the same manner, but in the case of uplink, read data is written at address 16 and above.

In FIG. 3, “20110414”, “20063600”, and “ff0111924” are displayed from address A400AB58. This is because the event of ff0111924 is on 11/04/14 (year / month / day) and 20:06:36 (time). The same event log that was collected by entering the terminal device without using the remote maintenance function is displayed.
The writing is the same from (a) to (f), but the writing data (g1), (g2). In the example of the data format in FIG. 7, eight byte data writes are described.

That is, as a data format, when there are a plurality of CPUs in a device having a device-specific number (a) for designating a target device to be remotely accessed and a device-specific number, the plurality of processing units This is composed of a board number of a number (b) for designating a target CPU for remote access among CPUs, an address (e) indicating a command for remote access, the number of data of reference data (f), and the like.
In the response phase (upstream data) format, the command phase (downstream data) new processes (a) to (f) and the read data are expressed in a continuous manner.

  According to this embodiment, by adopting a data format corresponding to the remote maintenance function, memory reference and memory writing can be performed with respect to a plurality of remote processing unit CPUs.

This embodiment considers the case where the communication medium between remote processing unit CPUs is different, and when performing remote maintenance, considering the case where there is an amount that cannot be processed by a single access, it is possible to perform any amount of processing by repeatedly performing processing. Data can be accessed via a communication medium.
The serial number (d) shown in FIG. 7 is applied in order to enable repeated processing while taking into account the amount of access processing performed once. An end packet when the command is divided is provided in the serial number (d). For example, a bit representing the final data is set in a bit that is the final data in a series of access data, thereby indicating that the packet is an end packet, thereby supporting an access process for divided data.

  According to this embodiment, even if there is an amount of data that cannot be processed by a single access, it is possible to access any amount of data by repeatedly processing. Therefore, the transmission capability of the communication medium between the processing units CPU of the terminal and the terminal relay unit allows continuous repetition processing by the serial number and end flag even if it is not completed in one transfer. Data transparency required for maintenance can be guaranteed.

DESCRIPTION OF SYMBOLS 1 ... Central apparatus 1a ... Central relay part 1b ... Transmission / reception part 2 ... Terminal apparatus 2a ... Terminal relay part 2b ... Transmission / reception part 13,23 ... SDLC circuit part 12, 22 ... Communication processing part PC ... Terminal (personal computer)

Claims (5)

Connect the central unit and a plurality of terminal units via a loop processing line via the communication processing unit of each terminal unit, and input the data obtained by the terminal relay unit of each terminal unit to the central relay unit of the central unit A digital protection relay system that executes a protection operation, wherein a plurality of processing unit CPU memories are provided in a terminal relay unit of each terminal device, and a communication processing unit is directly connected to the communication processing unit via a bus B1 among the plurality of processing unit CPU memories. The processing unit CPU memory to be connected is connected to the plurality of processing unit CPU memories via a bus B2 having a coupling method different from that of the bus B1, and the communication processing unit is connected to the processing unit CPU memory via the processing unit CPU memory connected to the bus B1. connected Te, in which collected in the central unit the data recorded in the respective processing unit CPU memory connected with different coupling system and a terminal connected to the central unit,
The central device and each terminal device are provided with an SDLC line unit capable of one-to-N (plurality) communication, and a function for selecting the processing unit CPU of the terminal device and a function for the selected processing unit CPU are provided in the SDLC line unit. A remote maintenance function having a read / write function is installed, and the processing unit CPU memory selected by the terminal is read / written via the SDLC line unit,
An accessible area is provided in advance in the memory area of the processing unit CPU, a read / write prohibited area for the remote maintenance function is provided, a restriction that cannot be read for an area that cannot be read by the remote maintenance function, and writing is performed. A remote maintenance device for a digital protective relay system, wherein a restricted area that cannot be written is provided for an area that must not be written. A history buffer area is provided in the processing unit CPU memory, and when the data is rewritten by the remote maintenance function, the data in the rewrite memory area is saved to the history buffer area, and it is determined whether or not there is a write change. 2. The remote maintenance device for a digital protection relay system according to claim 1, wherein when the write is not permitted and the communication line is abnormal, the saved data in the history buffer area is restored to the original area. The digital terminal according to claim 1 or 2, wherein an identification display of the terminal device and processing unit CPU of the communication destination is added to a man-machine interface of the terminal, and the added identification display is displayed at a terminal prompt. Remote maintenance device for protective relay system. The remote maintenance function displays the unique number of the terminal device, the board number designating the processing unit CPU, the address, and the number of data in an identifiable manner. Remote maintenance device for digital protective relay system. 5. The digital protection relay system according to claim 4, wherein the remote maintenance function has a function of recognizing a serial number indicating the continuity of processing between the processing units CPU of the terminal device and final data. Remote maintenance device.

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