Medium voltage converter for direct current system insulation monitoring device

Abstract

The utility model discloses a medium voltage converter used for a DC system insulation monitoring device, the medium voltage converter comprises a box body and a box cover, an electrical assembly is arranged in the box body, the electrical assembly comprises a circuit board box and a control panel which are connected through a cable, the control panel is arranged on the wall of the box body, the circuit board box comprises a shell and a circuit board, and the circuit board is arranged in the shell. The shell comprises a bottom plate and at least two symmetrically-arranged side walls, the shell is fixedly installed in the box body, the circuit board is connected between the two side walls, vertical circuit board grooves are formed in the inner sides of the side walls, guide rails are arranged at the two ends, connected with the two side walls, of the circuit board, and the guide rails are installed in the circuit board grooves. And a circuit board cover plate connected with the side wall is arranged above the circuit board. The medium-voltage converter for the DC system insulation monitoring device effectively solves the problem that a circuit board in the medium-voltage converter is difficult to maintain and replace, and simplifies the access of electrical equipment and the access of a cable at the same time.

Description

Technical Field

[0001] The utility model relates to a converter, in particular to a medium voltage converter used for a DC system insulation monitoring device. Background Art

[0002] The medium-voltage DC grid is the source of the ship's power system, and its safe operation is of great significance to ensuring the stability of the entire power system. The DC system insulation monitoring device is an important monitoring device to ensure the safe operation of the medium-voltage DC grid. It is used to monitor the insulation status of the medium-voltage power system to the ground and prevent serious safety problems such as grounding faults. The medium-voltage converter is an important component of the DC system insulation monitoring device, which is used to collect the leakage current signal of the sensor and realize the fault branch location function of the DC system insulation monitoring device.

[0003] Since the voltage and current of medium-voltage load branches are large, and medium-voltage loads are all primary loads, once an insulation fault occurs in a single fault branch, it is impossible to cut off the power one by one to troubleshoot the fault, and the fault is difficult to find, and manual troubleshooting is difficult. As an important component of the DC system insulation monitoring device, the core function of the medium-voltage converter is to collect the leakage current signal detected by the sensor at the lower end of the load branch main switch, and transmit it to the host through the communication interface, providing data support for the medium-voltage monitoring host to realize the fault branch positioning function, and can locate and troubleshoot the fault point in a timely and convenient manner.

[0004] However, in practical applications, especially when ships are operating at sea, medium-voltage converters face many challenges. The hull is easily affected by shaking at sea, and the working environment is under high salt and high humidity conditions. These factors make the electronic components in the medium-voltage converter prone to damage and repair. However, the existing technology has the problem of complex and difficult operation when repairing medium-voltage converters. Utility Model Content

[0005] In view of the above-mentioned deficiencies of current medium voltage converters, the utility model provides a medium voltage converter for a DC system insulation monitoring device, which effectively solves the problem of difficulty in repairing and replacing circuit boards inside the medium voltage converter, and at the same time simplifies the access of electrical equipment and the process of cables entering and exiting.

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

[0007] A medium voltage converter for a DC system insulation monitoring device, the medium voltage converter comprising a hollow box body and a box cover detachably connected to the box body, an electrical component is arranged in the box body, the electrical component comprises a circuit board box and a control panel connected by cables, the control panel is arranged on the box body wall, the circuit board box comprises a shell and a circuit board, the shell comprises a bottom plate and at least two symmetrically arranged side walls, the shell is fixedly installed in the box body, the circuit board is connected between the two side walls, the inner side of the side wall is provided with a vertical circuit board groove, the two ends of the circuit board connected to the two side walls are provided with guide rails, the guide rails are installed in the circuit board groove and can slide up and down in the circuit board groove, a circuit board cover is provided above the circuit board, and the two ends of the circuit board cover are connected to the side walls to limit the circuit board.

[0008] According to one aspect of the present invention, the medium voltage converter further includes a filter disposed inside the box.

[0009] According to one aspect of the utility model, the circuit board box also includes a rectangular electrical connector, which includes a rectangular connector socket and a rectangular connector plug that are mutually matched and connected, the rectangular connector socket is fixedly arranged on the base plate and / or the circuit board cover, the rectangular connector plug is fixedly arranged on the circuit board, and the cable is connected to the rectangular connector socket.

[0010] According to one aspect of the utility model, the guide rail includes a base plate and a blade plate which are vertically connected, and the cross section thereof is L-shaped or T-shaped, the blade plate is connected to the circuit board, and the base plate is connected to the circuit board slot.

[0011] According to one aspect of the utility model, the housing and / or the circuit board cover is provided with a cable opening for accommodating the passage of cables.

[0012] According to one aspect of the present invention, the circuit board includes a power board, a control board and a fiber optic modem board.

[0013] According to one aspect of the utility model, a fixing portion is provided at the bottom of the box body, and a mounting hole is provided on the fixing portion.

[0014] According to one aspect of the utility model, a fixing frame is provided on the inner wall of the box body, and the circuit board box is fixedly connected to the inner wall of the box body through the fixing frame.

[0015] According to one aspect of the utility model, the control panel includes a power switch, an indicator light, an aviation plug, a stuffing box and a fuse.

[0016] According to one aspect of the utility model, the circuit board box further comprises a partition plate, which is arranged between two adjacent circuit boards, and a vertical partition plate groove is provided on the inner side of the side wall, and the partition plate is installed in the partition plate groove.

[0017] The advantages of the implementation of the utility model are as follows: by arranging a power switch, an indicator light, an aviation plug, a stuffing box and a fuse on the box body, the cables can be conveniently connected to the chassis, and the operation and the entry and exit of the cables are convenient; by arranging a circuit board box inside the box body, the circuit board box includes a shell and a circuit board cover, a circuit board groove is arranged on the side wall of the shell, and guide rails are arranged at both ends of the circuit board. The guide rails are installed in the circuit board groove, and the circuit board can be easily plugged in and out while fixing the circuit board so that it will not shake, thereby facilitating the maintenance and replacement of the circuit board; by setting the filter, the power supply clutter interference signal can be effectively eliminated, and the electromagnetic compatibility of the equipment and the reliability of the equipment operation can be effectively improved; by setting the partition, the electromagnetic interference between the circuit boards can be effectively reduced, and the working stability of the equipment can be increased; the medium voltage converter provided by the utility model effectively solves the problem of difficulty in repairing and replacing the circuit board inside it, and at the same time, simplifies the access of electrical equipment and the process of cable entry and exit. 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 a medium voltage converter used in a DC system insulation monitoring device according to the utility model;

[0020] Figure 2 It is a schematic diagram of the exploded structure of a medium voltage converter used in a DC system insulation monitoring device according to the utility model;

[0021] Figure 3 The utility model is a three-dimensional cross-sectional view of a medium voltage converter used in a DC system insulation monitoring device.

[0022] Numbers in the figure:

[0023] 1. Box body; 11. Fixing part; 111. Mounting hole; 12. Power switch; 13. Indicator light; 14. Aviation plug; 15. Stuffing box; 16. Insurance; 17. Fixing bracket; 2. Box cover; 3. Box cover screws; 4. Filter; 5. Circuit board; 51. Power board; 52. Control board; 53. Fiber optic modem board; 6. Guide rail; 61 Base plate; 62 Leaf plate; 7. Circuit board box; 71. Shell; 711. Bottom plate; 712. Side wall; 7121. Circuit board slot; 7122. Partition plate slot; 713. Cable port; 714. Rectangular electrical connector; 7141. Rectangular connector socket; 7142. Rectangular connector plug; 72. Circuit board cover; 73. Partition plate; 74. Fixing screws. DETAILED DESCRIPTION

[0024] 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.

[0025] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1 , Figure 2 and Figure 3As shown, a medium voltage converter for a DC system insulation monitoring device, the medium voltage converter includes an internally hollow box 1 and a box cover 2, the box cover 2 is detachably mounted on the top of the box 1 by box cover screws 3, the box 1 is provided with electrical components, the electrical components include a circuit board box and a control panel connected by cables, the control panel is arranged on the wall of the box 1, the circuit board box includes a shell 71 and a circuit board 5, the circuit board 5 includes a power board 51, a control board 52 and a fiber optic modem board 53, the circuit board is installed inside the circuit board box 7, the power board 51 is mainly used to power a single-chip microcomputer, a fiber optic modem and a sensor, the control board 52 is mainly provided with communication functions, sampling functions, etc., the fiber optic modem board 53 is mainly used to cooperate with the fiber optic microcurrent sensor for optical signal modulation and demodulation in the measurement process. The housing 71 includes a bottom plate 711 and at least two symmetrically arranged side walls 712. The circuit board 5 is connected between the two side walls 712. A vertical circuit board slot 7121 is arranged inside the side wall 712. The two ends of the circuit board 5 connected to the two side walls are fixedly connected with guide rails 6. The guide rails 6 are installed in the circuit board slot 7121 and can slide up and down in the circuit board slot, so that the circuit board can be taken out of the housing 71, which is convenient for the maintenance and replacement of the circuit board. A circuit board cover plate 72 is arranged above the circuit board 5. The circuit board cover plate 72 is connected to the side wall by fixing screws 74 to limit the position of the circuit board 5 and prevent the circuit board 5 from loosening up and down and causing the circuit board to slide out. The control panel includes one or more of a power switch 12, an indicator light 13, an aviation plug 14, a stuffing box 15 and a fuse 16. One or more of the power switch 12, the indicator light 13, the aviation plug 14, the stuffing box 15 and the fuse 16 are connected to the circuit board 5 through a cable. Preferably, the power switch 12, the indicator light 13 and the fuse 16 are arranged in front of the box body 1 for easy operation. The aviation plug 14 and the stuffing box 15 can be arranged at one end for convenient access to the device according to the chassis position to be accessed as needed. The cable can be connected to the chassis through the aviation plug, and the optical cable can enter the chassis through the stuffing box, so as to facilitate the entry and exit of the cable.

[0028] In actual applications, the guide rail 6 is fixedly connected to the circuit board 5 by screws. The guide rail 6 includes a base plate 61 and a blade 62 that are vertically connected to each other, and its cross-sectional shape can be "L", "T", "Y", "mountain" and other shapes. The base plate 61 is connected to the circuit board groove 7121, and the blade 62 is connected to the circuit board 5.

[0029] The shell 71 and / or the circuit board cover 72 are provided with a cable opening 713 for accommodating the passage of cables. Preferably, the cable opening 713 is mainly used for the passage of optical cables, so that the optical cables can pass through the circuit board box through the cable opening and then be connected to the external optical fiber microcurrent sensor through the stuffing box.

[0030] The circuit board box 7 also includes a rectangular electrical connector 714, which includes a rectangular connector socket 7141 fixedly mounted on the bottom plate 711 and / or the circuit board cover 72 and a rectangular connector plug 7142 fixedly mounted on the circuit board 5, the rectangular connector plug 7142 is matched and connected with the rectangular connector socket 7141, and the cable is connected with the rectangular connector socket (7141). The rectangular electrical connector 714 adopts a rectangular electrical connector with an anti-misinsertion design. The anti-misinsertion rectangular electrical connector 714 can prevent the circuit board from being misinserted during the installation process, resulting in a short circuit of the circuit board, thereby damaging the electronic components.

[0031] A fixing portion 11 is provided at the bottom of the box body 1, and a mounting hole 111 is provided on the fixing portion 11. The box body 1 can be easily and firmly mounted on the bottom plate of the mounting hull by fixing screws, thereby effectively preventing the medium voltage converter from moving or shaking during use, thereby increasing the stability and reliability of the converter.

[0032] A fixing frame 17 is disposed inside the box body 1 , and the circuit board box 7 is mounted on the fixing frame 17 .

[0033] The advantages of this embodiment are as follows: by arranging a power switch, an indicator light, an aviation plug, a stuffing box and a fuse on the box body, the cables can be conveniently connected to the chassis, and the operation and the entry and exit of the cables are convenient; by arranging a circuit board box inside the box body, the circuit board box includes a shell and a circuit board cover, a circuit board groove is arranged on the side wall of the shell body, and guide rails are arranged at both ends of the circuit board. The guide rails are installed in the circuit board groove, and the circuit board can be easily plugged in and out while fixing the circuit board so that it will not shake, thereby facilitating the maintenance and replacement of the circuit board.

[0034] Example 2

[0035] like Figure 1 , Figure 2 and Figure 3As shown, a medium voltage converter for a DC system insulation monitoring device, the medium voltage converter includes an internally hollow box 1 and a box cover 2, the box cover 2 is detachably mounted on the top of the box 1 by box cover screws 3, the box 1 is provided with electrical components, the electrical components include a circuit board box and a control panel connected by cables, the control panel is arranged on the wall of the box 1, the circuit board box includes a shell 71 and a circuit board 5, the circuit board 5 includes a power board 51, a control board 52 and a fiber optic modem board 53, the circuit board is installed inside the circuit board box 7, the power board 51 is mainly used to power a single-chip microcomputer, a fiber optic modem and a sensor, the control board 52 is mainly provided with communication functions, sampling functions, etc., the fiber optic modem board 53 is mainly used to cooperate with the fiber optic microcurrent sensor for optical signal modulation and demodulation in the measurement process. The housing 71 includes a bottom plate 711 and at least two symmetrically arranged side walls 712. The circuit board is connected between the two side walls 712. A vertical circuit board slot 7121 is arranged inside the side wall 712. The two ends of the circuit board 5 connected to the two side walls are fixedly connected with guide rails 6. The guide rails 6 are installed in the circuit board slot 7121 and can slide up and down in the circuit board slot, so that the circuit board can be taken out of the housing 71, which is convenient for the maintenance and replacement of the circuit board. A circuit board cover plate 72 is arranged above the circuit board 5. The circuit board cover plate 71 is connected to the side wall by fixing screws 74 to limit the position of the circuit board 5 to prevent the circuit board from loosening up and down and causing the circuit board to slide out. The control panel includes one or more of a power switch 12, an indicator light 13, an aviation plug 14, a stuffing box 15 and a fuse 16. One or more of the power switch 12, the indicator light 13, the aviation plug 14, the stuffing box 15 and the fuse 16 are connected to the circuit board 5 through a cable. Preferably, the power switch 12, the indicator light 13 and the fuse 16 are arranged in front of the box body 1 for easy operation. The aviation plug 14 and the stuffing box 15 can be arranged at one end for convenient access to the device according to the chassis position to be accessed as needed. The cable can be connected to the chassis through the aviation plug, and the optical cable can enter the chassis through the stuffing box, so as to facilitate the entry and exit of the cable.

[0036] In actual applications, the guide rail 6 is fixedly connected to the circuit board 5 by screws. The guide rail 6 includes a base plate 61 and a blade 62 that are vertically connected to each other, and its cross-sectional shape can be "L", "T", "Y", "mountain" and other shapes. The base plate 61 is connected to the circuit board groove 7121, and the blade 62 is connected to the circuit board 5.

[0037] In actual applications, the shell 71 and / or the circuit board cover 72 are provided with a cable opening 713 for accommodating the passage of cables. Preferably, the cable opening 713 is mainly used for the passage of optical cables, so that the optical cables can pass through the cable opening through the circuit board box and then be connected to the external optical fiber microcurrent sensor through the stuffing box.

[0038] The circuit board box 7 also includes a rectangular electrical connector 714, which includes a rectangular connector socket 7141 fixedly mounted on the base plate 711 and / or the circuit board cover plate 72 and a rectangular connector plug 7142 fixedly mounted on the circuit board 5. The rectangular connector plug 7142 is cooperatively connected with the rectangular connector socket 7141, and the cable is connected to the rectangular connector socket (7141). The rectangular electrical connector 714 adopts an anti-misinsertion rectangular electrical connector 714. The anti-misinsertion rectangular electrical connector 714 can prevent the circuit board from being misinserted during the installation process, causing a short circuit in the circuit board, thereby damaging electronic components.

[0039] A fixing portion 11 is provided at the bottom of the box body 1, and a mounting hole 111 is provided on the fixing portion 11. The box body 1 can be easily and firmly mounted on the bottom plate of the mounting hull by fixing screws, thereby effectively preventing the medium voltage converter from moving or shaking during use, thereby increasing the stability and reliability of the converter.

[0040] A fixing frame 17 is disposed on the inner wall of the box body 1 , and the circuit board box 7 is fixedly mounted on the fixing frame 17 .

[0041] In practical applications, the medium voltage converter further includes a filter 4 disposed inside the housing 1. The filter can effectively eliminate power supply clutter interference signals and effectively improve the electromagnetic compatibility of the device and the reliability of the device.

[0042] The advantages of this embodiment are as follows: by arranging a power switch, indicator light, aviation plug, stuffing box and fuse on the box body, the cables can be easily connected to the chassis, which is convenient for operation and the entry and exit of cables; by arranging a circuit board box inside the box body, the circuit board box includes a shell and a circuit board cover, a circuit board groove is arranged on the side wall of the shell, and guide rails are arranged at both ends of the circuit board. The guide rails are installed in the circuit board groove, and the circuit board can be easily plugged in and out while fixing the circuit board so that it will not shake, thereby facilitating the maintenance and replacement of the circuit board; by setting the filter, the power supply clutter interference signal can be effectively eliminated, and the electromagnetic compatibility of the equipment and the reliability of the equipment operation can be effectively improved.

[0043] Example 3

[0044] like Figure 1 , Figure 2 and Figure 3As shown, a medium voltage converter for a DC system insulation monitoring device, the medium voltage converter includes a hollow box 1 and a box cover 2, the box cover 2 is fixedly mounted on the top of the box 1 by box cover screws 3, the box 1 is provided with electrical components, the electrical components include a circuit board box and a control panel connected by cables, the control panel is arranged on the wall of the box 1, the circuit board box includes a shell 71 and a circuit board 5, the circuit board 5 includes a power board 51, a control board 52, and a fiber optic modem board 53, the left and right ends of the circuit board 5 are fixedly connected with guide rails 6, the circuit board is installed in the circuit board box 7, the power board 51 is mainly used to power a single-chip microcomputer, a fiber optic modem and a sensor, the control board 52 is mainly provided with communication functions, sampling functions, etc., the fiber optic modem board 53 is mainly used to cooperate with the fiber optic microcurrent sensor for optical signal modulation and demodulation in the measurement process. The housing 71 includes a bottom plate 711 and at least two symmetrically arranged side walls 712. The circuit board 5 is connected between the two side walls 712. A vertical circuit board slot 7121 is arranged inside the side wall 712. The two ends of the circuit board 5 connected to the two side walls are fixedly connected with guide rails 6. The guide rails 6 are installed in the circuit board slot 7121 and can slide up and down in the circuit board slot, so that the circuit board can be taken out of the housing 71, which is convenient for the maintenance and replacement of the circuit board. A circuit board cover plate 72 is arranged above the circuit board 5. The circuit board cover plate 72 is connected to the side wall by fixing screws 74 to limit the position of the circuit board 5 and prevent the circuit board 5 from loosening up and down and causing the circuit board to slide out. The control panel includes one or more of a power switch 12, an indicator light 13, an aviation plug 14, a stuffing box 15 and a fuse 16. The power switch 12, the indicator light 13, the aviation plug 14, the stuffing box 15 and the fuse 16 are connected to the circuit board 5 through cables. Preferably, the power switch 12, the indicator light 13 and the fuse 16 are arranged in front of the box body 1 for easy operation. The aviation plug 14 and the stuffing box 15 can be arranged at one end for convenient access to the device according to the chassis position to be accessed as needed. The cable can be connected to the chassis through the aviation plug, and the optical cable can enter the chassis through the stuffing box, so as to facilitate the entry and exit of the cable.

[0045] In actual applications, the guide rail 6 is fixedly connected to the circuit board 5 by screws. The guide rail 6 includes a base plate 61 and a blade 62 that are vertically connected to each other, and its cross-sectional shape can be "L", "T", "Y", "mountain" and other shapes. The base plate 61 is connected to the circuit board groove 7121, and the blade 62 is connected to the circuit board 5.

[0046] The shell 71 and / or the circuit board cover 72 are provided with a cable opening 713 for accommodating the passage of cables. Preferably, the cable opening 713 is mainly used for the passage of optical cables, so that the optical cables can pass through the circuit board box through the cable opening and then be connected to the external optical fiber microcurrent sensor through the stuffing box.

[0047] The circuit board box 7 also includes a rectangular electrical connector 714, which includes a rectangular connector socket 7141 fixedly mounted on the base plate 711 and / or the circuit board cover plate 72 and a rectangular connector plug 7142 fixedly mounted on the circuit board 5. The rectangular connector plug 7142 is cooperatively connected with the rectangular connector socket 7141, and the cable is connected to the rectangular connector socket (7141). The rectangular electrical connector 714 adopts an anti-misinsertion rectangular electrical connector 714. The anti-misinsertion rectangular electrical connector 714 can prevent the circuit board from being misinserted during the installation process, causing a short circuit in the circuit board, thereby damaging electronic components.

[0048] A fixing portion 11 is provided at the bottom of the box 1, and a mounting hole 111 is provided on the fixing portion 11. The box can be easily and firmly mounted on the bottom plate of the mounting hull by fixing screws, thereby effectively preventing the medium voltage converter from moving or shaking during use, thereby increasing the stability and reliability of the converter.

[0049] A fixing frame 17 is disposed on the inner wall of the box body 1 , and the circuit board box 7 is fixedly mounted on the fixing frame 17 .

[0050] The medium voltage converter further comprises a filter 4 arranged inside the housing 1, and the filter can effectively eliminate power supply clutter interference signals, thereby effectively improving the electromagnetic compatibility of the device and the reliability of the device operation.

[0051] The circuit board box 7 also includes a partition 73. A partition groove 7122 is provided on the inner side of the side wall 712. The partition 73 is installed in the partition groove 7122. Usually, the partition groove 7122 is located between two circuit board grooves 7121. The partition 73 is arranged between two adjacent circuit boards. Preferably, the partition is a metal partition, preferably a partition made of stainless steel. Through the arrangement of the partition 73, the electromagnetic interference between the circuit boards can be effectively reduced, and the working stability of the equipment can be increased.

[0052] The advantages of this embodiment are as follows: by arranging a power switch, an indicator light, an aviation plug, a stuffing box and a fuse on the box body, the cables can be conveniently connected to the chassis, and the operation and the entry and exit of the cables are convenient; by arranging a circuit board box inside the box body 1, the circuit board box includes a shell and a circuit board cover, a circuit board groove is arranged on the side wall of the shell, and guide rails are arranged at both ends of the circuit board. The guide rails are installed in the circuit board groove, and the circuit board can be easily plugged in and out while fixing the circuit board so that it will not shake, thereby facilitating the maintenance and replacement of the circuit board; by setting the filter, the power supply clutter interference signal can be effectively eliminated, and the electromagnetic compatibility of the equipment and the reliability of the equipment operation can be effectively improved; by setting the partition, the electromagnetic interference between the circuit boards can be effectively reduced, and the working stability of the equipment can be increased.

[0053] The advantages of the implementation of the utility model are as follows: by arranging a power switch, an indicator light, an aviation plug, a stuffing box and a fuse on the box body, the cables can be conveniently connected to the chassis, and the operation and the entry and exit of the cables are convenient; by arranging a circuit board box inside the box body, the circuit board box includes a shell and a circuit board cover, a circuit board groove is arranged on the side wall of the shell, and guide rails are arranged at both ends of the circuit board. The guide rails are installed in the circuit board groove, and the circuit board can be easily plugged in and out while fixing the circuit board so that it will not shake, thereby facilitating the maintenance and replacement of the circuit board; by setting the filter, the power supply clutter interference signal can be effectively eliminated, and the electromagnetic compatibility of the equipment and the reliability of the equipment operation can be effectively improved; by setting the partition, the electromagnetic interference between the circuit boards can be effectively reduced, and the working stability of the equipment can be increased; the medium voltage converter provided by the utility model effectively solves the problem of difficulty in repairing and replacing the circuit board inside it, and at the same time, simplifies the access of electrical equipment and the process of cable entry and exit.

[0054] 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 medium voltage converter for a DC system insulation monitoring device, the medium voltage converter comprising a hollow box (1) and a box cover (2) detachably connected to the box, wherein an electrical component is arranged in the box, characterized in that: The electrical component comprises a circuit board box (7) and a control panel connected by a cable, the control panel being arranged on the wall of a box body (1), the circuit board box (7) comprising a shell (71) and a circuit board (5), the shell (71) comprising a bottom plate (711) and at least two symmetrically arranged side walls (712), the shell (71) being fixedly installed in the box body (1), the circuit board (5) being connected between the two side walls (712), the inner side of the side wall (712) being provided with a vertical circuit board groove (7121), guide rails (6) being provided at both ends of the circuit board (5) connected to the two side walls, the guide rails (6) being installed in the circuit board groove (7121) and being able to slide up and down in the circuit board groove (7121), a circuit board cover plate (72) being provided above the circuit board (5), the two ends of the circuit board cover plate (72) being connected to the side walls (712) to limit the circuit board (5).

2. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The medium voltage converter also includes a filter (4) arranged inside the box.

3. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The circuit board box (7) also includes a rectangular electrical connector (714), which includes a rectangular connector socket (7141) and a rectangular connector plug (7142) that are mutually matched and connected, the rectangular connector socket (7141) is fixedly arranged on the base plate (711) and / or the circuit board cover plate (72), the rectangular connector plug (7142) is fixedly arranged on the circuit board (5), and the cable is connected to the rectangular connector socket (7141).

4. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The guide rail (6) comprises a vertically connected base plate (61) and a blade plate (62), the cross section of which is L-shaped or T-shaped, the blade plate (62) being connected to the circuit board (5), and the base plate (61) being connected to the circuit board slot (7121).

5. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The housing (71) and / or the circuit board cover (72) is provided with a cable opening (713) for accommodating the passage of cables.

6. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The circuit board (5) comprises a power board (51), a control board (52) and an optical fiber modem board (53).

7. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The bottom of the box body (1) is provided with a fixing portion (11), and the fixing portion is provided with a mounting hole (111).

8. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The inner wall of the box body (1) is provided with a fixing frame (17), and the circuit board box (7) is fixedly connected to the inner wall of the box body via the fixing frame.

9. The medium voltage converter for a DC system insulation monitoring device according to claim 1, characterized in that: The control panel comprises a power switch (12), an indicator light (13), an aviation plug (14), a stuffing box (15) and a fuse (16).

10. The medium voltage converter for a DC system insulation monitoring device according to any one of claims 1 to 9, characterized in that: The circuit board box (7) further comprises a partition (73), which is arranged between two adjacent circuit boards (5); a vertical partition groove (7122) is provided on the inner side of the side wall (712), and the partition (73) is installed in the partition groove (7122).

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