Grounding resistance collector for DC system insulation monitoring device

Abstract

The utility model discloses a grounding resistance collector for a DC system insulation monitoring device, which relates to the technical field of electronic devices and comprises a case, a power switch and a fuse are arranged on the case, the power switch is respectively connected with an external power supply and the fuse, and the fuse is connected with the external power supply. A filter, a voltage source, a power panel, a control panel, a relay panel and a power resistor are arranged in the case, the fuse is connected with the filter, the filter is connected with the voltage source and the power panel, the power panel is connected with the control panel and the relay panel, the control panel, the relay panel and the power resistor are sequentially connected, and the fuse is connected with the power resistor. And the power resistor is connected with the grounding resistor. The grounding resistance collector used for the DC system insulation monitoring device provided by the utility model fills the market blank, can conveniently complete the signal injection measurement work of the grounding resistance of a medium-voltage DC power grid, and is simple in overall structure, convenient to disassemble, assemble and maintain, and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, in particular to a ground resistance collector for a medium voltage DC system insulation monitoring device. Background Art

[0002] In the J ship power supply system, the medium voltage DC power grid is the backbone network of the J ship power supply system and the starting point of the entire power system. Its stability directly determines the power supply safety of the entire power system and is an important guarantee for the vitality and combat effectiveness of the J ship power system.

[0003] However, the medium-voltage DC power grid with neutral point grounding is significantly different from the previous low-voltage AC and DC in terms of power system and voltage level. Its insulation resistance measurement method is different from other previous insulation monitoring devices. Therefore, in order to ensure the stable operation and accurate monitoring of the medium-voltage DC power grid, a DC system insulation monitoring device specifically used for grid insulation monitoring is required. The grounding resistance collector is an important component of the DC system insulation monitoring device, which is mainly used to provide the voltage signal source required for injection measurement into the grounding resistance of the medium-voltage power grid.

[0004] Therefore, it is necessary to design a new ground resistance collector that can facilitate the signal injection measurement of the ground resistance in the medium voltage DC system insulation monitoring device. Utility Model Content

[0005] In view of the above needs, the utility model provides a grounding resistance collector for a DC system insulation monitoring device, which fills the market gap and can facilitate the signal injection measurement of the grounding resistance of a medium-voltage DC power grid. The overall structure is simple, easy to disassemble and maintain, and easy to use.

[0006] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0007] A grounding resistance collector for a DC system insulation monitoring device comprises a chassis, wherein the chassis is provided with a power switch and a fuse, wherein the power switch is connected to an external power supply and the fuse respectively, wherein a filter, a voltage source, a power supply board, a control board, a relay board and a power resistor are arranged in the chassis, wherein the fuse is connected to the filter, wherein the filter is connected to the voltage source and the power supply board respectively, wherein the power supply board is connected to the control board and the relay board respectively, wherein the control board, the relay board and the power resistor are connected in sequence, and wherein the power resistor is connected to a grounding resistor.

[0008] According to one aspect of the utility model, the relay board is provided with a high-voltage relay, there are four high-voltage relays, and there are a plurality of power resistors, which are used in parallel.

[0009] According to one aspect of the utility model, the relay board is further provided with internal wiring terminals, the chassis is further provided with external wiring terminals, and the high-voltage relay, internal wiring terminals, power resistors, external wiring terminals, and grounding resistors are connected in sequence.

[0010] According to one aspect of the utility model, the chassis is connected with a fixed base plate, a mounting seat, and a mounting plate, the voltage source is installed on the fixed base plate, the power board, the control board, and the relay board are installed on the mounting seat in sequence, and the power resistor and external wiring terminals are installed on the mounting plate.

[0011] According to one aspect of the utility model, the chassis is also provided with an electrical connector, a stuffing box, and an indicator light.

[0012] According to one aspect of the utility model, the chassis includes a box body and a box cover, the box cover is detachably connected to the box body, and the power switch, fuse, electrical connector, stuffing box, and indicator light are all arranged on the box body.

[0013] According to one aspect of the utility model, a nameplate is provided on the box cover.

[0014] According to one aspect of the utility model, it also includes a mounting bracket and a shock absorber, wherein one end of the shock absorber is connected to the mounting bracket, and the other end is connected to the chassis.

[0015] According to one aspect of the utility model, a fixing hole is provided on the mounting bracket.

[0016] According to one aspect of the utility model, a communication module, a sampling circuit, and an analog signal detection circuit are provided on the control board.

[0017] Advantages of the implementation of the utility model: When the grounding resistance collector receives the measurement instruction from the host in the medium-voltage DC system insulation monitoring device, the control board in the chassis controls the high-voltage relay on the relay board to put the voltage source (i.e., signal source) into the power grid to be measured, that is, the high-voltage relay is controlled to superimpose DC200V on the grounding resistance segment resistance of the medium-voltage power grid in both positive and negative directions, and perform signal injection and measurement processes; in this way, the grounding resistance collector can easily complete the signal injection measurement of the grounding resistance of the medium-voltage DC power grid, filling the market gap. By arranging a shock absorber and a mounting bracket at the bottom of the box, the grounding resistance collector can be installed vertically or wall-mounted, and has buffering and vibration reduction performance, a stable structure, convenient assembly, and strong applicability. By setting the box cover to be detachably connected to the box, the grounding resistance collector can open the cover to repair and replace the internal components, and disassembly and maintenance are more convenient. At the same time, the overall structure of the grounding resistance collector is simple, easy to manufacture and process, and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0021] Figure 3 It is the front view of the utility model;

[0022] Figure 4 It is a top view of the utility model.

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] 1. Box body; 2. Power switch; 3. Box cover; 4. Shock absorber; 5. Mounting bracket; 6. Filter; 7. External wiring terminal; 8. Power resistor; 9. Voltage source; 10. Power board; 11. Control board; 12. Relay board; 13. Fuse; 14. Electrical connector; 15. Nameplate; 16. Fixed base plate; 17. Mounting base; 18. Mounting plate; 19. Fixing hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] like Figure 1-Figure 4As shown, a ground resistance collector for a medium voltage DC system insulation monitoring device is installed in the DC system insulation monitoring device and connected to the host in the device; the ground resistance collector includes a chassis, a power switch 2, a fuse 13, an electrical connector 14, a stuffing box, an indicator light, a filter 6, a voltage source 9, a power board 10, a control board 11, a relay board 12, a power resistor 8, and an external terminal 7. The chassis includes a box body 1 and a box cover 3, wherein the box body 1 is in the shape of a hollow rectangular parallelepiped and the box cover 3 is in the shape of a rectangular plate; the four corners of the box cover 3 are connected to the box body 1 by bolts, so that it is convenient to replace and repair the components inside the box body 1; a nameplate 15 is provided on the box cover 3. The power switch 2, fuse 13, electrical connector 14, stuffing box and indicator light are all arranged on the box body 1; the power switch 2 is used as a power supply switch, and the model specification is KN32250V AC. The power switch 2 is connected to the external power supply (i.e., AC220V working power supply) and the fuse 13 respectively; the fuse 13 is used for power protection, and the model specification is 250V / 4A, and the fuse 13 is connected to the filter 6; the electrical connector 14 uses the circular electrical connector 14 of the AVIC Optronics series, which is used for external cable connection; the stuffing box uses the Glengall series for the measurement line to enter and exit; the indicator light is used as a power indicator light, and the model specification selected is GQ8G-D / N. The filter 6, voltage source 9, power board 10, control board 11, relay board 12, power resistor 8, and external wiring terminal 7 are all installed in the box 1; wherein the filter 6 is connected to the voltage source 9 and the power board 10 respectively, the filter 6 is used for power filtering, and the selected model specification is FLCE83M-6A; the voltage source 9 is used as the signal source required for measurement, and the model specification is 4NIC-TD400 / 200G, that is, DC200V Chaoyang power supply; the power board 10 is connected to the control board 11 and the relay board 12 respectively, and the power board 10 is used to convert the external AC220V power supply into the working power required by the internal circuit boards; the control board 11, the relay board 12, the power resistor 8, and the external wiring terminal 7 are connected in sequence, and the external wiring terminal 7 is used as the wiring terminal of the measurement line, The control board 11 is a CPU board, which belongs to a single-chip microcomputer control circuit board, on which a CAN communication module, an AD sampling circuit, and a 4-20mA analog signal detection circuit are arranged to meet the needs of communication sampling measurement and the like; the relay board 12 is a circuit board, on which internal wiring terminals and four high-voltage relays are arranged, the high-voltage relay has a withstand voltage of not less than 4000v, and is mainly used for electrical safety isolation between the device and the external measurement line when no measurement is performed, the high-voltage relay, the internal wiring terminals, the power resistor 8, the external wiring terminals 7, and the grounding resistor are connected in sequence; the power resistor 8 is used as a current limiting resistor used in measurement, and the model specification is RXG-2450Ω / 500W, and there are two of them, and the two power resistors 8 are used in parallel to increase the power and heat dissipation of the resistor.

[0028] In this embodiment, a fixed bottom plate 16, a mounting seat 17, and a mounting plate 18 are connected to the box body 1. The voltage source 9 is mounted on the fixed bottom plate 16; the fixed bottom plate 16 is a plate-shaped structure, welded to the side of the box body 1, and provides fixing and heat dissipation functions for the voltage source 9. The power board 10, the control board 11, and the relay board 12 are installed on the mounting seat 17 in sequence from left to right; the mounting seat 17 has a U-shaped cross section, and is a shape structure composed of a bottom plate and two front and rear plates perpendicular to it; three groups of corresponding AVIC Optronics 60-core rectangular electrical connections are fixed on the mounting seat 17, and the three circuit boards (power board 10, control board 11, relay board 12) are connected through the cable on the back of the AVIC Optronics 60-core rectangular electrical connection. The power resistor 8 and the external terminal 7 are both installed on the mounting plate 18; the mounting plate 18 is a square plate-shaped structure, made of steel, and is welded and fixed to the side of the box body 1; a bakelite board is added between the external terminal 7 and the mounting plate 18 to improve the insulation and withstand voltage performance of the external terminal 7 connected to the outside.

[0029] In this embodiment, the AC220V working power supply is connected to the inside of the box body 1 through the AVIC Optoelectronics circular electrical connector 14 arranged on the box body 1, and then connected to the power switch 2 and the fuse 13 in turn, and then connected to the filter 6, and after filtering by the filter 6, it is output to the AC DC200V Chaoyang power supply and the power supply end of the power board 10; the DC200V Chaoyang power supply is connected to the AVIC Optoelectronics 60-core rectangular electrical connection on the mounting seat 17 corresponding to the relay board 12 through a cable; the CAN communication module on the CPU board is connected to the AVIC Optoelectronics circular electrical connector 14 arranged on the box body 1 through the cable of the AVIC Optoelectronics 60-core rectangular electrical connection on the mounting seat 17 (corresponding to it), so as to complete the communication with other devices; the CPU board controls the combination of four high-voltage relays to superimpose DC200V on the segmented resistance of the grounding resistance of the medium-voltage power grid in both positive and negative directions, which is convenient for signal injection and completion of the measurement process; the cable is connected to the chassis through the electrical connector 14 and the stuffing box.

[0030] In this embodiment, the height of the chassis is 230 mm, the length (in the main viewing direction) is 310 mm, and the width (in the side viewing direction) is 370 mm.

[0031] In this embodiment, the power switch 2, fuse 13, electrical connector 14, stuffing box, indicator light, terminal blocks (internal and external), AVIC Optronics 60-core rectangular electrical connection, etc. are all existing mature conventional technologies and will not be described in detail.

[0032] The working principle of this device is as follows: when this grounding resistance collector receives a measurement instruction from the host in the medium-voltage DC system insulation monitoring device, the control board 11 in the chassis controls the high-voltage relay on the relay board 12 to input the voltage source 9 (i.e., the signal source) into the power grid to be measured, that is, by controlling the combination of four high-voltage relays to superimpose DC200V on the medium-voltage power grid grounding resistance segment resistance in both positive and negative directions, and perform signal injection and measurement processes.

[0033] The beneficial effect of this embodiment is that the ground resistance collector can easily complete the signal injection measurement of the ground resistance of the medium voltage DC power grid, filling the market gap. By setting the box cover 3 to be detachably connected to the box body 1, the ground resistance collector can open the cover to repair and replace the internal components, making disassembly and maintenance more convenient. At the same time, the overall structure of the ground resistance collector is simple, easy to manufacture and process, and easy to use.

[0034] Embodiment 2

[0035] The difference between this embodiment and the first embodiment is that the ground resistance collector further includes a mounting bracket 5 and a vibration damper 4 , one end of the vibration damper 4 is connected to the mounting bracket 5 , and the other end is connected to the bottom of the box 1 .

[0036] In this embodiment, the mounting bracket 5 is provided with a plurality of waist-shaped fixing holes 19; bolt-type fasteners are used to pass through the fixing holes 19 to install the mounting bracket 5, that is, the entire device, into the DC system insulation monitoring device, and the entire device can be installed vertically or wall-mounted. The vibration absorber 4 uses a wire rope vibration absorber 4, the model specification is ALJ-8210, and is used for buffering and vibration reduction.

[0037] In this embodiment, the mounting bracket 5 is in the shape of a U-shaped plate, and there are two of them, which are symmetrically arranged at the two ends of the bottom of the chassis; two wire rope vibration dampers 4 are arranged on one mounting bracket 5.

[0038] In this embodiment, the center distance of the fixing holes 19 on the same horizontal line of the two mounting brackets 5 is 190 mm, the center distance of the fixing holes 19 at the head and tail ends of one mounting bracket 5 is 381 mm, and the width of the mounting bracket 5 (or the length of the longest side) is 400 mm. The distance between the bottom surface of the mounting bracket 5 and the upper surface of the chassis (i.e., the upper surface of the box cover 3) is 292 mm. The outermost tangent distance of the arc-shaped contour of the fixing hole 19, i.e., the waist-shaped hole (left and right sides), is 14 mm, and the semicircular hole diameter is 6 mm.

[0039] The beneficial effects of this embodiment are: by arranging the shock absorber 4 and the mounting bracket 5 at the bottom of the box body 1, the ground resistance collector can be installed both vertically and wall-mounted, and has buffering and vibration reduction performance, a stable structure, convenient assembly, and strong applicability. The ground resistance collector can easily complete the signal injection measurement of the ground resistance of the medium-voltage DC power grid, filling the market gap. By setting the box cover 3 detachably connected to the box body 1, the ground resistance collector can open the cover to repair and replace the internal components, and disassembly and maintenance are more convenient. At the same time, the overall structure of the ground resistance collector is simple, easy to manufacture and process, and easy to use.

[0040] Advantages of the utility model:

[0041] 1. It can easily and accurately complete the signal injection and measurement process of the grounding resistance of the medium-voltage DC power grid, providing a new market style and filling the market gap;

[0042] 2. Convenient disassembly and maintenance, stable structure and strong applicability;

[0043] 3. The overall structure is simple, easy to manufacture and process, and easy to use.

[0044] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A ground resistance collector for a DC system insulation monitoring device, comprising a chassis, wherein the chassis is provided with a power switch (2) and a fuse (13), wherein the power switch (2) is connected to an external power supply and the fuse (13) respectively, and wherein: The chassis is provided with a filter (6), a voltage source (9), a power board (10), a control board (11), a relay board (12), and a power resistor (8); the fuse (13) is connected to the filter (6); the filter (6) is connected to the voltage source (9) and the power board (10) respectively; the power board (10) is connected to the control board (11) and the relay board (12) respectively; the control board (11), the relay board (12), and the power resistor (8) are connected in sequence; and the power resistor (8) is connected to a grounding resistor.

2. The ground resistance collector for a DC system insulation monitoring device according to claim 1, characterized in that: The relay board (12) is provided with a high-voltage relay, and there are four of the high-voltage relays. The power resistors (8) are provided in a plurality, and the plurality of power resistors (8) are used in parallel.

3. The ground resistance collector for a DC system insulation monitoring device according to claim 2, characterized in that: The relay board (12) is also provided with an internal wiring terminal, and the chassis is also provided with an external wiring terminal (7). The high-voltage relay, the internal wiring terminal, the power resistor (8), the external wiring terminal (7), and the grounding resistor are connected in sequence.

4. The ground resistance collector for a DC system insulation monitoring device according to claim 3, characterized in that: The chassis is connected with a fixed base plate (16), a mounting seat (17), and a mounting plate (18); the voltage source (9) is mounted on the fixed base plate (16); the power board (10), the control board (11), and the relay board (12) are sequentially installed on the mounting seat (17) at intervals; and the power resistor (8) and the external wiring terminal (7) are installed on the mounting plate (18).

5. The ground resistance collector for a DC system insulation monitoring device according to claim 1, characterized in that: The chassis is also provided with an electric connector (14), a stuffing box and an indicator light.

6. The ground resistance collector for a DC system insulation monitoring device according to claim 5, characterized in that: The case comprises a case body (1) and a case cover (3); the case cover (3) is detachably connected to the case body (1); and the power switch (2), fuse (13), electrical connector (14), stuffing box, and indicator light are all arranged on the case body (1).

7. The ground resistance collector for a DC system insulation monitoring device according to claim 6, characterized in that: The box cover (3) is provided with a nameplate (15).

8. The ground resistance collector for a DC system insulation monitoring device according to claim 1, characterized in that: It also comprises a mounting bracket (5) and a shock absorber (4), wherein one end of the shock absorber (4) is connected to the mounting bracket (5) and the other end is connected to the chassis.

9. The ground resistance collector for a DC system insulation monitoring device according to claim 8, characterized in that: The mounting bracket (5) is provided with a fixing hole (19).

10. The ground resistance collector for a DC system insulation monitoring device according to claim 1, characterized in that: The control board (11) is provided with a communication module, a sampling circuit, and an analog signal detection circuit.

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