Distributed power distribution monitoring device

Abstract

The invention relates to the field of geodetic network monitoring, in particular to a distributed power distribution monitoring device. The invention provides a distributed power distribution monitoring device which comprises a local monitoring cabinet and a plurality of outdoor monitoring boxes. The local monitoring cabinet comprises a first calculation unit and a plurality of first function units; the outdoor monitoring box comprises a second calculation unit and a plurality of second function units; the first functional unit is coupled with a plurality of first measuring sites located indoors through measuring cables, and the second functional unit is coupled with a plurality of second measuring sites located outdoors through measuring cables; the first computing unit and the second computing unit enable electrical integrity information transmission.

Description

Technical Field

[0001] This invention relates to the field of geogrid monitoring, and in particular to a distributed power distribution monitoring device. Background Technology

[0002] The power distribution monitoring device is used to monitor in real time the physical quantities of the grounding grid between different voltage levels in the substation, between grounding terminals of different equipment, and between the main control room and the grounding trunk line and the railway integrated grounding system, such as contact voltage, step voltage and electrical integrity, as well as the resistance value of the grounding grid and its changes, and the return current of the grounding grid.

[0003] The monitoring points for the aforementioned physical quantities are distributed in both the indoor and outdoor environments of the substation. The indoor monitoring points require monitoring equipment to be installed indoors and connected via cables, while the outdoor monitoring points also require monitoring equipment to be installed indoors and connected via cables extending outdoors.

[0004] Therefore, in traditional power distribution monitoring devices, there is a direct cable connection between the monitoring equipment installed indoors and the measurement points outdoors. When there is a lightning strike on the outdoor grounding grid, the lightning current may interfere with the monitoring equipment of the power distribution monitoring device through the cable at the outdoor measurement point, or affect other equipment installed indoors. Summary of the Invention

[0005] The purpose of this invention is to provide a distributed power distribution monitoring device that can prevent the current from the outdoor ground grid from interfering with the indoor monitoring equipment through the outdoor measurement points via cables.

[0006] On the one hand, the distributed power distribution monitoring device provided by the present invention includes a local monitoring cabinet and several outdoor monitoring boxes;

[0007] The local monitoring cabinet includes a first computing unit and several first functional units; the outdoor monitoring box includes a second computing unit and several second functional units; the first functional units are coupled to several first measurement points located indoors via measurement cables, and the second functional units are coupled to several second measurement points located outdoors via measurement cables.

[0008] The first computing unit and the second computing unit are capable of transmitting electrical integrity information.

[0009] Furthermore, the first computing unit and the second computing unit are coupled via optical fiber.

[0010] Furthermore, a plurality of the first functional units include a first electrical integrity monitoring unit electrically connected to the first computing unit;

[0011] The second functional units include a second electrical integrity monitoring unit, a return current monitoring unit, and a contact voltage step voltage monitoring unit, which are respectively electrically connected to the second computing unit.

[0012] Furthermore, the local monitoring cabinet also includes a first fiber optic conversion module, and the outdoor monitoring box also includes a second fiber optic conversion module.

[0013] Furthermore, the aforementioned outdoor monitoring boxes include a first monitoring box and a second monitoring box;

[0014] The first monitoring box contains the second electrical integrity monitoring unit, the return current monitoring unit, and the second calculation unit. The second monitoring box contains the contact voltage step voltage monitoring unit.

[0015] Furthermore, the measuring cable is provided with multiple control components, each of which includes a main circuit and a branch circuit. One end of the branch circuit is connected to the main circuit, and the other end is coupled to the first measuring point or the second measuring point. The branch circuit is provided with a switch, which can switch the main circuit to be connected to the first measuring point. The multiple control components are connected in series on the measuring cable through the main circuit.

[0016] Furthermore, the control component also includes a remote controller for controlling the switching element, and a plurality of the remote controllers are coupled to the first computing unit or the second computing unit via a two-bus connection.

[0017] Furthermore, the local monitoring cabinet also includes a return current indicator module and a contact voltage step voltage indicator module. The return current indicator module is coupled to the return current monitoring unit, and the contact voltage step voltage indicator module is coupled to the contact voltage step voltage monitoring unit.

[0018] Furthermore, the first monitoring box is also equipped with a grounding resistance monitoring unit.

[0019] Furthermore, the local monitoring cabinet includes a cabinet body and several drawers that move and cooperate with the cabinet body, with the first computing unit and several first functional units respectively located inside the drawers.

[0020] Beneficial effects:

[0021] In addition to the indoor local monitoring cabinet, this scheme also includes several outdoor monitoring boxes to measure specific physical quantities of the ground network at outdoor measurement points, and to process and transmit the measured results to the local monitoring cabinet.

[0022] Compared to existing solutions that require cables to be run from the indoor monitoring cabinet to the measurement point when measuring the outdoor grounding grid, this solution eliminates the direct cable connection between the second measurement point and the local monitoring cabinet, thus avoiding interference from external factors such as lightning strikes on the indoor local monitoring cabinet. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the layout of the distributed power distribution monitoring device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the electrical connection between the local monitoring cabinet and the first monitoring box provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the electrical connection between the local monitoring cabinet and the second monitoring box provided in an embodiment of the present invention;

[0027] Figure 4 A circuit diagram of the control component provided in an embodiment of the present invention.

[0028] Icons: 1-Local monitoring cabinet; 2-Outdoor monitoring box; 3-First calculation unit; 4-First functional unit; 5-Second calculation unit; 6-Second functional unit; 7-First monitoring box; 8-Second monitoring box; 9-First measurement point; 10-Second measurement point; 11-First fiber optic conversion module; 12-First electrical integrity monitoring unit; 13-Return current indicator module; 14-Contact voltage step voltage indicator module; 15-Second fiber optic conversion module; 16-Second electrical integrity monitoring unit; 17-Return current monitoring unit; 18-Contact voltage step voltage monitoring unit; 19-Control component; 20-Remote controller; 21-Main circuit; 22-Switch; 23-Branch circuit. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example

[0031] like Figures 1 to 4 The distributed power distribution monitoring device shown includes a local monitoring cabinet 1 and several outdoor monitoring boxes 2; the local monitoring cabinet 1 includes a first computing unit 3 and several first functional units 4; the outdoor monitoring boxes 2 include a second computing unit 5 and several second functional units 6; the first functional units 4 are coupled to several first measurement points 9 located indoors via measurement cables, and the second functional units 6 are coupled to several second measurement points 10 located outdoors via measurement cables; the first computing unit 3 and the second computing unit 5 can realize the transmission of electrical integrity information.

[0032] The function of the first computing unit 3 is to control the first functional unit 4 in the local monitoring cabinet 1 and the second computing unit 5 in the outdoor monitoring box 2, and to receive instructions from the host computer. The first functional unit 4 has sensors, measuring instruments or circuits that perform specific functions, and measures specific physical quantities of the ground network at the first measurement point located indoors. The first computing unit 3 analyzes, displays and transmits the results measured by the first functional unit 4 to the host computer.

[0033] The function of the second calculation unit 5 is to control the second functional unit 6 and receive instructions from the first calculation unit 3. The second functional unit 6 measures specific physical quantities of the ground grid at the outdoor measurement point. The second calculation unit 5 processes the results measured by the second functional unit 6 and transmits them to the first calculation unit 3.

[0034] Compared to existing solutions that require cables to be run from the indoor monitoring cabinet to the measurement point when measuring the outdoor grounding grid, this solution uses an outdoor monitoring box 2 located outdoors to monitor the outdoor grounding grid. The outdoor monitoring box 2 transmits measurement results to the indoor local monitoring cabinet 1. There is no direct cable connection between the second measurement point and the local monitoring cabinet 1, thus avoiding interference from external lightning currents and other factors to the indoor local monitoring cabinet 1.

[0035] In one alternative implementation, the first computing unit 3 and the second computing unit 5 are coupled via optical fiber.

[0036] The electrical integrity monitoring cabinet and several outdoor monitoring boxes 2 transmit information via optical fiber. The measurement result data of the second electrical integrity monitoring unit 16 is transmitted to the first calculation unit 3 inside the indoor electrical integrity monitoring cabinet, isolating external current interference.

[0037] Specifically, the local monitoring cabinet 1 is equipped with a first fiber optic conversion module 11, and the outdoor monitoring box 2 is equipped with a second fiber optic conversion module 15. The first fiber optic conversion module 11 is connected to the first computing module via a network cable port, and the second fiber optic conversion module 15 is connected to the second computing module via a network cable port. The first fiber optic conversion module 11 is used for the network cable port to fiber optic conversion of the signal transmission of the first computing unit 3.

[0038] The function and principle of the second fiber optic conversion module 15 are the same as those of the first fiber optic conversion module 11.

[0039] In one alternative implementation, a plurality of first functional units 4 include a first electrical integrity monitoring unit 12 electrically connected to the first computing unit 3;

[0040] Several second functional units 6 include a second electrical integrity monitoring unit 16, a return current monitoring unit 17, and a contact voltage step voltage monitoring unit 18, which are respectively electrically connected to the second computing unit 5.

[0041] The local monitoring cabinet 1 located indoors is equipped with a first electrical integrity monitoring unit 12. The first electrical integrity monitoring unit 12 is connected to the first computing unit 3 through a network cable port to realize information transmission. The first electrical integrity monitoring unit 12 includes an electrical integrity tester. When conducting indoor electrical integrity testing, the principle is to treat the indoor ground grid as a small resistor. The electrical integrity tester injects DC measurement current through the cable and the first measurement point. The measurement current flows through this small resistor. The voltage across the resistor is calculated by AD sampling. This voltage is compared with the voltage across the standard resistor inside the electrical integrity tester, and the resistance value of the small resistor of the indoor ground grid can be calculated proportionally.

[0042] The first monitoring box 7 is also equipped with a grounding resistance monitoring unit.

[0043] The local monitoring cabinet 1 includes a cabinet body and several drawers that move and cooperate with the cabinet body. The first computing unit 3, the first electrical integrity monitoring unit 12, the grounding resistance monitoring unit, the first optical fiber conversion module 11, and the power supply module are respectively located in the corresponding drawers.

[0044] In one optional implementation, the plurality of outdoor monitoring boxes 2 include a first monitoring box 7 and a second monitoring box 8;

[0045] The first monitoring box 7 contains a second fiber optic conversion module 15, a second electrical integrity monitoring unit 16, a return current monitoring unit 17, and a second computing unit 5. The second monitoring box 8 contains a second fiber optic conversion module 15 and a contact voltage / step voltage monitoring unit 18.

[0046] The first monitoring box 7 located outdoors is equipped with a second electrical integrity monitoring unit 16, which also includes an electrical integrity tester. When conducting outdoor electrical integrity testing, the testing principle is the same as that of the electrical integrity tester in the first electrical integrity monitoring unit 12.

[0047] The first monitoring box 7 is also equipped with a return current monitoring unit 17, which is equipped with a return current integrated monitoring terminal. The current transformer at the end of the cable of the measurement port of the return current integrated monitoring terminal is sleeved on each return current bus in the centralized grounding box to realize the acquisition of return current signal. The return current signal is converted into a small voltage signal by the sampling resistor. The small voltage signal is amplified and then sampled by AD. The AD sampling value is used as a reference voltage to calculate the return current small voltage signal. The voltage is divided by the resistance to calculate the return current magnitude. The second calculation unit 5 then transmits the return current magnitude information to the first calculation unit 3.

[0048] The second monitoring box 8, also located outdoors, is equipped with a contact voltage and step voltage monitoring unit 18. The first monitoring box 7 and the second monitoring box 8 are located in different areas outdoors. The contact voltage and step voltage monitoring unit 18 is used to monitor the contact voltage caused by backflow and to trigger an over-limit alarm. It adopts a passive measurement method. It is also used to monitor the step voltage caused by backflow and to trigger an over-limit alarm. It also adopts a passive measurement method. The contact voltage and step voltage monitoring unit 18 transmits the monitoring information to the first calculation unit 3. The first calculation unit 3 then controls the backflow indicator module 13 and the contact voltage and step voltage indicator module 14 in the local monitoring cabinet 1 according to the monitoring information. The backflow indicator module 13 and the contact voltage and step voltage indicator module 14 are respectively equipped with indicator boards or other devices for displaying information externally, such as displays, speakers or buzzers.

[0049] In one optional embodiment, the measuring cable is provided with a plurality of control components 19, each control component 19 including a main circuit 21 and a branch circuit 23. One end of the branch circuit 23 is connected to the main circuit 21, and the other end is coupled to a first measuring point or a second measuring point. The branch circuit 23 is provided with a switch 22, which can switch the main circuit 21 to be connected to the first measuring point. The plurality of control components 19 are connected in series on the measuring cable through the main circuit 21.

[0050] The first functional unit 4, such as the first electrical integrity monitoring unit 12, is electrically connected to multiple first measurement points via cables. The test port of the electrical integrity tester corresponds to each first measurement point via the control component 19. When it is necessary to perform an electrical integrity test on one of the first measurement points, the control component 19 can enable the first measurement point to form a connected circuit with the test port of the electrical integrity tester, and disconnect the circuit between the other first measurement points and the test port of the electrical integrity tester.

[0051] The control component 19 on the measurement cable between the first functional unit 4 and the first measurement point is electrically connected to the first computing unit 3 via a two-wire bus. One first measurement point corresponds to one control component 19. In this scheme, the main circuits 21 of multiple control components 19 are connected in series to form a main circuit. The main circuit is connected to the test port of the electrical integrity tester of the first electrical integrity monitoring unit 12 via a cable. Each control component 19 has a branch circuit 23, that is, multiple branch circuits 23 are connected to the main circuit. The end of each branch circuit 23 is connected to a first measurement point. Each branch circuit 23 is equipped with a switch 22, which is a relay structure. Controlled by the remote controller 20, which is electrically connected to the first computing unit 3, the first computing unit 3 sends a command to the remote controller 20 corresponding to the first measurement point requiring electrical integrity testing. Upon receiving the command, the remote controller 20 controls the switch 22 on that branch circuit 23 to close, while the switches 22 on other branches remain open. This creates a connected circuit between the first measurement point corresponding to the closed switch 22 and the test port of the electrical integrity tester in the first electrical integrity monitoring unit 12. The first computing unit 3 then sends a command to the electrical integrity tester in the first electrical integrity monitoring unit 12 to perform the electrical integrity test. After the test is completed, the switch 22 on that branch circuit 23 opens.

[0052] The second functional unit 6, such as the second electrical integrity monitoring unit 16, is also electrically connected to multiple second measurement points via cables. The test ports of the electrical integrity tester correspond to each second measurement point via the control component 19. When one of the second measurement points needs to be tested for electrical integrity, the control component 19 enables a connected circuit to be formed between that second measurement point and the test port of the electrical integrity tester of the second electrical integrity monitoring unit 16, and disconnects the circuit between other second measurement points and the test ports of the electrical integrity tester. The control component 19 on the measurement cable between the second functional unit 6 and the first measurement point is electrically connected to the second computing unit 5 via a two-wire bus.

[0053] The operating principle of the control component 19 on the measurement cable between the second functional unit 6 and the first measurement point is the same as that of the control component 19 on the measurement cable between the first functional unit 4 and the first measurement point.

[0054] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A distributed power distribution monitoring device, characterized in that, Includes a local monitoring cabinet (1) and several outdoor monitoring boxes (2); The local monitoring cabinet (1) includes a first computing unit (3) and several first functional units (4); the outdoor monitoring box (2) includes a second computing unit (5) and several second functional units (6); the first functional unit (4) is coupled to several first measurement points (9) located indoors via measurement cables, and the second functional unit (6) is coupled to several second measurement points (10) located outdoors via measurement cables; The first computing unit (3) and the second computing unit (5) are capable of transmitting electrical integrity information.

2. The distributed power distribution monitoring device according to claim 1, characterized in that, The first computing unit (3) and the second computing unit (5) are coupled together by optical fiber.

3. The distributed power distribution monitoring device according to claim 1, characterized in that, A plurality of the first functional units (4) include a first electrical integrity monitoring unit (12) electrically connected to the first computing unit (3); The second functional units (6) include a second electrical integrity monitoring unit (16), a return current monitoring unit (17), and a contact voltage step voltage monitoring unit (18), which are respectively electrically connected to the second computing unit (5).

4. The distributed power distribution monitoring device according to claim 2, characterized in that, The local monitoring cabinet (1) also includes a first optical fiber conversion module (11), and the outdoor monitoring box (2) also includes a second optical fiber conversion module (15).

5. The distributed power distribution monitoring device according to claim 3, characterized in that, The outdoor monitoring boxes (2) include a first monitoring box (7) and a second monitoring box (8); The first monitoring box (7) is equipped with the second electrical integrity monitoring unit (16), the return current monitoring unit (17) and the second calculation unit (5), and the second monitoring box (8) is equipped with the contact voltage step voltage monitoring unit (18).

6. The distributed power distribution monitoring device according to claim 1, characterized in that, The measuring cable is provided with multiple control components (19), each of the control components (19) includes a main circuit (21) and a branch circuit (23). One end of the branch circuit (23) is connected to the main circuit (21), and the other end is coupled to the first measuring point or the second measuring point. The branch circuit (23) is provided with a switch (22), which can switch the main circuit (21) to be connected to the first measuring point. The multiple control components (19) are connected in series on the measuring cable through the main circuit (21).

7. The distributed power distribution monitoring device according to claim 6, characterized in that, The control component (19) further includes a remote controller (20) for controlling the switch (22), and multiple remote controllers (20) are coupled to the first computing unit (3) or the second computing unit (5) via a two-bus connection.

8. The distributed power distribution monitoring device according to claim 1, characterized in that, The local monitoring cabinet (1) further includes a return current indicator module (13) and a contact voltage step voltage indicator module (14). The return current indicator module (13) is coupled to the return current monitoring unit (17), and the contact voltage step voltage indicator module (14) is coupled to the contact voltage step voltage monitoring unit (18).

9. The distributed power distribution monitoring device according to claim 5, characterized in that, The first monitoring box (7) is also equipped with a grounding resistance monitoring unit.

10. The distributed power distribution monitoring device according to any one of claims 1-9, characterized in that, The local monitoring cabinet (1) includes a cabinet body and several drawers that move in conjunction with the cabinet body. The first calculation unit (3) and several first functional units (4) are located in the drawers respectively.

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