DTU multi-interval simultaneous automatic point alignment test method and device

Abstract

The invention discloses a DTU multi-interval simultaneous automatic point alignment test method and device, and belongs to the field of power systems. The device comprises a current signal source, a current output control module, a plurality of groups of control switches, a primary side coil, a plurality of corresponding secondary side coils, a main interval current output port, a plurality of interval switches and secondary interval current output ports in one-to-one correspondence with the interval switches, the current signal source is respectively connected with the primary side coil and the main interval current output port through a plurality of groups of control switches; each secondary side coil is connected with a corresponding secondary interval current output port through an interval switch; and the current output control module is used for controlling the output of the current signal source and the opening and closing of the multiple groups of control switches and each interval switch. The device can realize switching between single-interval output and multi-interval output, so that current output has no extra loss during single-interval output, the power is maximized, and self-definition of the number of interval output during multi-interval current output is realized.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a DTU multi-interval simultaneous automatic point-to-point testing method and device. Background Art

[0002] As an important equipment for distribution network automation, the stability and reliability of the functions and performance of distribution automation terminals directly affect the safety of electricity use and property safety for industry and residents. Since the distribution network is a power grid that is distributed to various users step by step, there are many corresponding distribution network projects and the corresponding distribution terminals are huge in scale. In order to achieve safe and reliable distribution networks, whether from the factory inspection of distribution terminal manufacturers or the acceptance inspection and annual inspection tests of power companies, relevant enterprises and units must invest a lot of manpower and material resources to carry out inspection and testing of distribution terminals.

[0003] Taking the protection terminal of the distribution terminal unit (DTU) ring main unit as an example, the ring main unit on site usually has four compartments, while the conventional distribution network tester usually has one compartment of voltage and current output. In the traditional DTU device point-to-point joint debugging method, manual communication with the distribution automation master station is usually adopted to conduct point-to-point joint debugging and function and performance testing of the DTU device interval by interval, which is extremely inefficient. In addition, due to manual uncertainties, the accuracy of point-to-point joint debugging is usually low and the coverage of test items is incomplete, resulting in great safety hazards when the DTU device is put into operation. Summary of the invention

[0004] The main purpose of the present invention is to solve the problems of low accuracy of multi-interval point-to-point joint debugging, incomplete coverage of test items and low test efficiency in the point-to-point joint debugging process of the DTU device.

[0005] The present invention provides a DTU multi-interval simultaneous automatic point-to-point testing device, comprising: a current signal source, a current output control module, a plurality of control switches, a primary coil and a plurality of corresponding secondary coils, a main interval current output port, a plurality of interval switches and secondary interval current output ports corresponding to the interval switches one by one; the current signal source is respectively connected to the primary coil and the main interval current output port through the plurality of control switches; each secondary coil is connected to the corresponding secondary interval current output port through an interval switch; the current output control module controls the output of the current signal source, the plurality of control switches and the opening and closing of each interval switch.

[0006] In the DTU multi-interval simultaneous automatic point-to-point testing device of the present invention, the transformation ratio relationship between the primary coil and the plurality of secondary coils is decreasing in sequence.

[0007] In the DTU multi-interval simultaneous automatic point-to-point test device of the present invention, there are three secondary coils, and the transformation ratio of the primary coil and the three secondary coils is 10:9:8:7.

[0008] The DTU multi-interval simultaneous automatic point-to-point testing device of the present invention also includes a voltage output module; the voltage output module is connected to the voltage output interface and provides a voltage signal source.

[0009] The DTU multi-interval simultaneous automatic point-to-point testing device of the present invention also includes a communication module for communicating with a power distribution master station.

[0010] The present invention also provides a method for automatic point-to-point testing of multiple intervals of a DTU, based on the above-mentioned device, comprising: when a current output of one interval is detected, controlling multiple groups of control switches to close the connection with the current output port of the main interval, and disconnecting the connection with the primary coil; when a current output of multiple intervals is detected, controlling multiple groups of control switches to close the connection with the current output port of the main interval, and controlling the closing of the corresponding interval switches according to the number of secondary intervals to be output; after detecting the current output signal, controlling the current signal source to output the rated value.

[0011] In the DTU multi-interval simultaneous automatic point-to-point test method of the present invention, before the control current signal source outputs the rated value, it also includes: sending a fixed value modification request to the master station, and waiting for the master station to modify the fixed value to complete the remote adjustment point-to-point test; In the DTU multi-interval simultaneous automatic point-to-point testing method of the present invention, the modified overcurrent protection action constants of different intervals are different, and the size corresponds to the ratio of the primary coil to the secondary coil.

[0012] In the DTU multi-interval simultaneous automatic point-to-point testing method of the present invention, before the control current signal source outputs the rated value, it also includes: waiting for the master station to test the opening and closing operations of each interval exit position of the DTU device to complete the remote control point-to-point test, and accordingly, after the remote control point-to-point test is qualified, the control current signal source outputs the rated value.

[0013] The present invention also provides a computer storage medium, which stores a computer program executable by a processor, and the computer program executes any of the above-mentioned DTU multi-interval simultaneous automatic point-to-point testing methods.

[0014] The beneficial effects of the present invention are as follows: single-interval output and multi-interval output switching can be realized, so that the current output has no additional loss and the power is maximized during single-interval output, and the customization of the number of sub-interval outputs during multi-interval current output is realized at the same time. The simultaneous output of multiple intervals can effectively control the test variables during point testing and realize the diversification of test schemes, thereby solving the problems of low accuracy of point-to-point joint debugging, incomplete coverage of test items, and low test efficiency of the DTU device during the point-to-point joint debugging process, thereby improving the online rate and coverage rate of distribution automation terminals and ensuring the safe and reliable operation of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 2 is a schematic diagram of the structure of a DTU multi-interval simultaneous automatic point-to-point testing device according to an embodiment of the present invention; Figure 2 This is a multi-interval output logic control flow chart of the DTU multi-interval simultaneous automatic point-to-point testing device according to an embodiment of the present invention; Figure 3 It is a schematic diagram of an application scenario of a DTU multi-interval simultaneous automatic point-to-point testing device according to an embodiment of the present invention; Figure 4 This is a flowchart of the simultaneous automatic point alignment test method for DTU multiple intervals according to an embodiment of the present invention; Explanation of the accompanying drawings: 1. Current signal source; 2. Current output control module; 3. Multiple groups of control switches 3; 41. Primary coil; 42. Secondary coil; 5. Interval switch; 61. Main interval current output port; 62. Secondary interval current output port. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] The present invention provides a method and device for realizing automatic point-to-point testing of multiple intervals of DTU at the same time, aiming to improve the efficiency of automatic point-to-point testing of DTU devices and ensure the online rate and coverage rate of distribution automation terminals. Figures 1 to 4 The DTU multi-interval simultaneous automatic point testing method and device of the present invention are described. Figure 1Schematic diagram of the structure of the DTU multi-interval simultaneous automatic point-to-point testing device according to an embodiment of the present invention. Figure 1 As shown, the present invention provides a DTU multi-interval simultaneous automatic point-to-point testing device, comprising: A current signal source 1, a current output control module 2, multiple groups of control switches 3, a primary coil 41 and corresponding secondary coils 42, multiple interval switches 5, a main interval current output port 61 and multiple secondary interval current output ports 62; the current signal source 1 is connected to the primary coil 41 and the main interval current output port 62 respectively through the multiple groups of control switches 3; each secondary coil 42 is connected to the corresponding secondary interval current output port 62 through an interval switch 5; the current output control module 2 controls the output of the current signal source, the multiple groups of control switches 3 and the opening and closing of each interval switch 5.

[0019] Among them, the multi-interval current output of the present invention adopts the principle of electromagnetic induction, and uses a method such as a multi-tap current transformer to realize the output of currents of different amplitudes at different intervals. Among them, the branch formed by the secondary coil and the corresponding switch can be one or more. The current signal source 1 adopts a high-power current signal source. First, the high-power current signal source 1 is connected to different intervals through multiple groups of control switches 3 and interval switches 5. Those directly connected through multiple groups of control switches 3 are called main intervals here, and those connected through a single interval switch 5 are called secondary intervals. Secondly, the output ports of different secondary intervals are respectively connected to the secondary coils 42 of different transformation ratios of the multi-tap current transformer through the interval switch 5. Finally, the current output control module 2 controls the high-power signal source 1, multiple groups of control switches 3 and interval switches 5, and according to the setting parameters of the host computer system or the received parameters, it can realize the synchronous control output of currents of different amplitudes at different intervals.

[0020] The DTU multi-interval simultaneous automatic point-to-point testing device provided by the present invention can realize the switching between single-interval output and multi-interval output by controlling the main interval and the primary coil simultaneously through multiple groups of control switches, so that the current output has no additional loss and the power is maximized during single-interval output; each sub-interval of the multi-interval output is controlled by the interval switch, so that the number of sub-interval outputs during multi-interval current output is customized. Based on this, single-interval output and multi-interval simultaneous output can be performed according to demand, and multi-interval simultaneous output can effectively control the test variables during point testing and realize the diversification of test schemes, thereby solving the problems of low accuracy of point-to-point joint debugging, incomplete coverage of test items, and low test efficiency of the DTU device during point-to-point joint debugging, thereby improving the online rate and coverage rate of distribution automation terminals and ensuring the safe and reliable operation of the distribution network.

[0021] In one embodiment, the transformation ratio relationship of the primary coil and the plurality of secondary coils is decreasing in sequence. As for the transformation ratio relationship of the coils, the transformation ratio decreases in sequence from the primary coil to each secondary coil, so that the current output by each secondary interval can be specifically distinguished, and the main interval is directly output through multiple groups of control switches, and the current of the output port of the main interval can be output differently from the secondary interval.

[0022] In one embodiment, there are three secondary coils, and the transformation ratio of the primary coil and the three secondary coils is 10:9:8:7. At present, the current intervals of a general DTU device are four, and the secondary coils are three. The secondary intervals corresponding to the secondary coils and the main intervals directly connected to multiple groups of control switches together constitute the current output of the four intervals. The transformation ratio of the primary coil and the three secondary coils is 10:9:8:7, based on which it can be ensured that different intervals output currents with different proportional coefficients, and the current difference between the intervals will not be too large.

[0023] Figure 2 1 is a multi-interval output logic control flow chart of the DTU multi-interval simultaneous automatic point-to-point test device according to an embodiment of the present invention, such as Figure 2 As shown, in specific use, the current output control module controls the high-power current signal source 1, multiple groups of control switches 3, and interval switches 5 as a whole according to the parameters sent by the host computer system, and the output current amplitude of the high-power current signal source 1 is In.

[0024] When the DTU device under test has only one bay, the multiple control switches 3 only close the connection with bay 1, so that the test current amplitude output by bay 1 is In, and the multiple control switches 3 disconnect the connection with the primary coil 41, so that there is no current output in other bays, while avoiding power loss of the coil.

[0025] When the DTU device under test has two bays, multiple groups of control switches are closed to connect bay 1 and the primary coil of the current transformer, and disconnector 1 is closed at the same time, so that the secondary induction coil 1 can be connected to the current output port of bay 2, so that the test current amplitudes of bay 1 and bay 2 are synchronously output to be In and 0.9In respectively.

[0026] When the DTU device under test has three bays, multiple groups of control switches are closed to connect with bay 1 and the primary coil of the current transformer, and isolating switch 1 and isolating switch 2 are closed at the same time, so that the secondary induction coil 1 can be connected to the current output port of bay 2, and the secondary induction coil 2 can be connected to the current output port of bay 3, so that the test current amplitudes of bay 1, bay 2 and bay 3 output synchronously are In, 0.9In and 0.8In respectively.

[0027] When the DTU device under test has 4 bays, multiple groups of control switches are closed to connect with bay 1 and the primary coil of the current transformer, and disconnectors 1, 2 and 3 are closed at the same time, so that the secondary induction coil 1 can be connected to the current output port of bay 2, the secondary induction coil 2 can be connected to the current output port of bay 3, and the secondary induction coil 3 can be connected to the current output port of bay 4, so that the test current amplitudes of bay 1, bay 2, bay 3 and bay 4 output synchronously are In, 0.9In, 0.8In and 0.7In respectively.

[0028] In one embodiment, the device further comprises a voltage output module, which is connected to the voltage output interface and provides a voltage signal source. In one embodiment, the device further comprises a communication module for communicating with a power distribution master station.

[0029] Specific as Figure 3 As shown, in the actual point-to-point joint debugging operation, the point-to-point test device and the DTU device simultaneously establish a communication connection with the front-end server of the distribution automation master station. At the same time, the voltage, current and switch position signals of the point test device are connected to the DTU device at different intervals through physical connections, thereby constructing a closed system formed by the point test device, the DTU device and the distribution automation master station.

[0030] The point-to-point test device outputs analog signals and simulates switch positions for multiple intervals of the DTU device simultaneously through the voltage, current and switch output ports, and sends the relevant analog signals and switch position signals to the front-end server of the distribution automation master station in the form of message data merging and compression according to the intervals, and the point-to-point debugging function module records and analyzes the data. After the DTU device collects the analog quantity and switch position signals of the point-to-point test device, it transmits the actual sampling information of the DTU at different intervals to the front-end server of the distribution automation master station in sequence in the mutation and cyclic upload mode. On the one hand, the control function module of the distribution automation master station visualizes the test information, and on the other hand, the point-to-point debugging function module of the distribution automation master station compares the multi-interval test information transmitted by the point-to-point test device and the DTU device, determines whether the test results of the DTU device at different intervals are normal, and generates relevant test reports.

[0031] In addition, the present invention also provides a DTU multi-interval simultaneous automatic point-to-point testing method based on the above device, comprising: S1. When one interval current output is detected, multiple groups of control switches are controlled to close the connection with the main interval current output port, and the connection with the primary coil is disconnected; when multiple interval current outputs are detected, multiple groups of control switches are controlled to close the connection with the main interval current output port, and the corresponding interval switches are controlled to close according to the number of sub-intervals to be output.

[0032] S2. After detecting the current output signal, control the current signal source to output the rated value.

[0033] Before S1, a test environment is built. The point test device is connected to the DTU device through a test line. The DTU device and the point test device establish communication with the distribution automation master station through 4G.

[0034] Then, the DTU multi-interval telemetry and telesignaling point-to-point test is carried out, the point-to-point test device increases the output, the voltage is output according to the rated value, and the four interval current amplitudes are output according to 10:9:8:7 to ensure that the four interval protections can act simultaneously. The distribution automation master station receives the telemetry and telesignaling messages sent by the distribution automation terminal, and analyzes the judgment results. It determines whether the telemetry is successful through the current amplitudes of different intervals, and determines whether the telesignaling of different intervals is successful through the specific interval protection action messages and switch positions sent to the distribution automation master station at different intervals. For details, please refer to the detailed description in the above device embodiment, which will not be repeated here.

[0035] In one embodiment, before the control current signal source outputs the rated value, the method further includes: sending a set value modification request to the master station, and waiting for the master station to complete the set value modification to complete the remote adjustment point test.

[0036] like Figure 4 As shown, before adding the amount, a point-to-point test of the DTU multi-interval remote adjustment setting is performed, and the point-to-point test device sends a setting modification request to the distribution automation master station to ensure that the overcurrent protection action settings of different intervals of the distribution master station are different. The distribution automation master station reads back the setting again to determine whether the setting modification of different intervals of the DTU device is successful.

[0037] In one embodiment, the modified overcurrent protection action settings for different intervals are different, and the size corresponds to the ratio of the primary coil to the secondary coil. That is, the current setting is set according to the coil ratio, such as setting the current setting ratio relationship of interval 1 to interval 4 according to the above ratio of 10:9:8:7.

[0038] In one embodiment, before the control current signal source outputs the rated value, it also includes: waiting for the master station to test the opening and closing operations of each interval exit position of the DTU device to complete the remote control point test, and accordingly, after the remote control point test is passed, the control current signal source outputs the rated value.

[0039] It is also necessary to carry out DTU multi-interval remote control point-to-point testing. The distribution automation master station remotely opens and closes the four interval exit positions of the distribution terminal in turn, and judges whether the remote control exit is correct by the change in the position of the input quantity of the point-to-point device.

[0040] After the above-mentioned remote adjustment, remote control, telemetry and telesignaling point-to-point tests are completed, the remote adjustment, remote control, telemetry and telesignaling point-to-point test results of the DTU device are recorded and a relevant test report is generated.

[0041] The present application also provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, a server, an App application store, etc., on which a computer program is stored, and the program realizes corresponding functions when executed by a processor. The computer-readable storage medium of this embodiment realizes the method embodiment DTU multi-interval simultaneous automatic point-to-point test method when executed by a processor.

[0042] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0043] The order of execution of each step in the above embodiment does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0044] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A DTU multi-interval simultaneous automatic point-to-point testing device, characterized in that: include: A current signal source, a current output control module, a plurality of control switches, a primary coil and a plurality of corresponding secondary coils, a main interval current output port, a plurality of interval switches and a secondary interval current output port corresponding to the interval switches one by one; The current signal source is connected to the primary coil and the main interval current output port respectively through the multiple groups of control switches; Each secondary coil is connected to a corresponding sub-interval current output port through an interval switch; The current output control module controls the output of the current signal source, the opening and closing of the multiple groups of control switches and each interval switch.

2. The DTU multi-interval simultaneous automatic point-to-point testing device according to claim 1 is characterized in that: The transformation ratio relationship between the primary coil and the plurality of secondary coils is decreasing in sequence.

3. The DTU multi-interval simultaneous automatic point-to-point testing device according to claim 2 is characterized in that: There are three secondary coils, and the transformation ratio of the primary coil and the three secondary coils is 10:9:8:

7.

4. The DTU multi-interval simultaneous automatic point-to-point testing device according to claim 1 is characterized in that: The device also includes a voltage output module; The voltage output module is connected to the voltage output interface and provides a voltage signal source.

5. The DTU multi-interval simultaneous automatic point-to-point testing device according to claim 1 is characterized in that: The device also includes a communication module for communicating with a power distribution master station.

6. A DTU multi-interval simultaneous automatic point testing method based on the device according to any one of claims 1 to 5, characterized in that: include: When a bay current output is detected, multiple groups of control switches are controlled to close the connection with the main bay current output port, and disconnect the connection with the primary coil; When multiple interval current outputs are detected, multiple groups of control switches are controlled to close the connection with the main interval current output port, and the corresponding interval switches are controlled to close according to the number of sub-intervals to be output; After the current output signal is detected, the current signal source is controlled to output the rated value.

7. The DTU multi-interval simultaneous automatic point-to-point testing method according to claim 6 is characterized in that: Before the control current signal source outputs the rated value, it also includes: Send a set value modification request to the master station and wait for the master station to complete the set value modification to complete the remote adjustment point test.

8. The DTU multi-interval simultaneous automatic point-to-point testing method according to claim 7 is characterized in that: After modification, the overcurrent protection action settings for different intervals are different, and the size corresponds to the ratio of the primary coil to the secondary coil.

9. The DTU multi-interval simultaneous automatic point-to-point testing method according to claim 6 is characterized in that: Before the control current signal source outputs the rated value, it also includes: Wait for the master station to test the opening and closing operations of each interval exit position of the DTU device to complete the remote control point test. Accordingly, after the remote control point test is passed, the control current signal source outputs the rated value.

10. A computer storage medium, characterized in that: A computer program executable by a processor is stored therein, and the computer program executes the DTU multi-interval simultaneous automatic point-to-point testing method as described in any one of claims 6 to 9.

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