Monitoring host for insulation monitoring of alternating current medium voltage system

Abstract

The utility model discloses a monitoring host for insulation monitoring of an alternating current medium voltage system, which comprises a box body, a control panel is arranged on the box body, and a power board, a control board, a relay board, a signal source board, a filter, a transformer, an isolation board and the like are arranged in the box body. The monitoring host for insulation monitoring of the AC medium-voltage system provided by the utility model can inject a measurement signal into a power network, collect a voltage signal of the power network, monitor the insulation state of an AC medium-voltage power grid, timely find whether the power grid has a fault, and facilitate maintenance and debugging of the power grid; functional modularization and position layout are carried out, so that maintenance and debugging are facilitated; by arranging the isolation plate, electromagnetic interference between different circuit boards can be effectively reduced, and the working stability of equipment is improved; the device has the advantages of interference resistance, convenience in maintenance, large operation space, high structural stability and the like.

Description

Technical Field

[0001] The utility model relates to the field of power network monitoring, in particular to a monitoring host for insulation monitoring of an AC medium voltage system. Background Art

[0002] In a ship power system, the ungrounded neutral point method is generally used to reduce the overload current when the power system has a ground short circuit, keep the three-phase power of the system balanced, thus ensuring the safety of the system and maintaining the stability and continuity of the system power supply.

[0003] Therefore, studying the monitoring problem of the insulation state of an AC medium voltage power network, and timely discovering and solving problems when the power network fails, is of great significance for ensuring the normal operation of the power network, the power supply continuity of the power system, and reducing the labor intensity of staff.

[0004] In practical applications, especially in the scenario of a ship operating at sea, the monitoring host faces 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 it possible for the electronic components in the monitoring host to be damaged and repaired. However, the existing technology has problems of complex and difficult operation when repairing the monitoring host. Summary of the Utility Model

[0005] In view of the above problems, the utility model provides a monitoring host for insulation monitoring of an AC medium voltage system, which can monitor the insulation state of the power network and timely discover the fault problems of the power network.

[0006] To achieve the above object, the embodiments of the utility model adopt the following technical solutions:

[0007] A monitoring host for insulation monitoring of an AC medium voltage system, the monitoring host includes a box body with a hollow interior and a box cover detachably connected to the box body. It is characterized in that a control panel is arranged on the outer wall of the box body, and a circuit board and a power conversion component are arranged inside the box body; the box body includes a first partition and a second partition; the first partition includes two symmetrically arranged inner walls up and down, the circuit board is connected between the two inner walls, and horizontal circuit board grooves are arranged on the inner walls. Guide rails are provided at both ends of the circuit board connected to the two side walls, and the circuit board is detachably fixed in the circuit board groove through the guide rails; the second partition includes fixing holes, and the power conversion component is installed in the second partition through the fixing holes.

[0008] According to one aspect of the utility model, a power switch, a fuse, an indicator light, and a plurality of electrical connectors are arranged on the control panel.

[0009] According to one aspect of the present utility model, the electrical connector includes a terminal row, a 30-core electrical connection, a 41-core electrical connection, a 14-core electrical connection, a 24-core electrical connection, and a number of 4-core electrical connections; the terminal row, fuse, power switch, and indicator light are connected in sequence.

[0010] According to one aspect of the present utility model, the circuit board includes: a power supply board, a control board, a relay board, and a signal source board; the power supply board is respectively connected to the control board, the relay board, and the signal source board, the control board is connected to the relay board and the signal source board, the relay board is connected to the signal source board, and the control panel is connected to the power supply board, the control board, the relay board, and the signal source board.

[0011] According to one aspect of the present utility model, the power conversion component includes: a filter and a transformer; the filter, the transformer, and the power supply board are connected in sequence.

[0012] According to one aspect of the present utility model, the box body includes an inner shell; the inner shell is provided with a horizontal circuit board slot on the upper and lower shell walls in the first partition for installing a guide rail; the inner shell is provided with a fixing hole on one side shell wall in the second partition for installing the power conversion component.

[0013] According to one aspect of the present utility model, a circuit board cover plate is provided on the inner side of the box cover, and both ends of the circuit board cover plate are connected to the shell wall of the inner shell to limit the circuit board.

[0014] According to one aspect of the present utility model, a partition board is provided between two adjacent circuit boards in the first partition, and a horizontal partition board slot is further provided on the inner wall of the first partition, and the partition board is installed in the partition board slot.

[0015] According to one aspect of the present utility model, the box cover is detachably installed on the side of the box body through a fastener.

[0016] According to one aspect of the present utility model, fixing plates are provided at the four corners of the bottom of the box body, and the fixing plates are provided with fixing holes.

[0017] Advantages of the implementation of the present utility model:

[0018] The technical solution provided by the present utility model provides a monitoring host for insulation monitoring of an AC medium-voltage system, which can inject measurement signals into the power network, collect power network voltage signals, monitor the insulation status of the AC medium-voltage power grid, timely detect whether a fault occurs in the power grid, and facilitate the maintenance and debugging of the power grid.

[0019] The monitoring host provided by this application fixes the circuit board in the circuit board slot inside the box body in a pluggable manner. While ensuring that the circuit board does not shake during fixation, the circuit board can be easily inserted and removed vertically, thus facilitating the repair and replacement of the circuit board. By setting up a filter, it can effectively eliminate power supply clutter interference signals, effectively improve the electromagnetic compatibility of the device and the reliability of the device operation. By setting up an isolation board to isolate different circuit boards, it can effectively reduce the electromagnetic interference between different circuit boards and increase the working stability of the device.

[0020] Applying the monitoring host provided by this application and carrying out functional modularization and position layout can meet the creepage distance and electrical clearance of the medium-voltage system, enhance the anti-interference ability of the device, and facilitate maintenance and debugging.

[0021] The monitoring host provided by this application has the advantages of anti-interference, easy maintenance, large operating space, and strong structural stability. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is an exploded structural schematic diagram of a monitoring host for insulation monitoring of an AC medium-voltage system according to the present utility model;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of a monitoring host for insulation monitoring of an AC medium-voltage system according to the present utility model;

[0025] Figure 3 It is a three-dimensional sectional view of a monitoring host for insulation monitoring of an AC medium-voltage system according to the present utility model.

[0026] Reference Numerals: 1, box body; 2, box cover; 3, control panel; 4, circuit board; 5, power conversion component; 6, guide rail; 7, circuit board cover plate; 8, isolation board; 9, fixing plate; 31, power switch; 32, fuse; 33, indicator light; 341, terminal block; 342, 30-core electrical connection; 343, 41-core electrical connection; 344, 14-core electrical connection; 345, 24-core electrical connection; 346, 4-core electrical connection; 41, power supply board; 42, control board; 43, relay board; 44, signal source board; 51, filter; 52, transformer. Detailed Description of the Embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Embodiment 1

[0029] As Figure 1 、 2 As shown in FIGS. 2 and 3, a monitoring host for insulation monitoring of an AC medium voltage system, the monitoring host includes a box body 1 with a hollow interior and a box cover 2 detachably connected to the box body 1. It is characterized in that a control panel 3 is provided on the outer wall of the box body 1, and a circuit board 4 and a power conversion component 5 are provided inside the box body 1; the box body 1 includes a first partition and a second partition; the first partition includes two symmetrically arranged inner walls, the circuit board 4 is connected between the two inner walls, and horizontal circuit board grooves are provided on the inner walls. Rails 6 are provided at both ends of the circuit board 4 connected to the two side walls, and the circuit board 4 is detachably fixed in the circuit board groove through the rails 6; the second partition includes fixing holes, and the power conversion component 5 is installed in the second partition through the fixing holes.

[0030] The circuit board 4 includes: a power supply board 41, a control board 42, a relay board 43, and a signal source board 44; the power supply board 41 is respectively connected to the control board 42, the relay board 43, and the signal source board 44, the control board 42 is connected to the relay board 43 and the signal source board 44, the relay board 43 is connected to the signal source board 44, and the control panel 3 is connected to the power supply board 41, the control board 42, the relay board 43, and the signal source board 44.

[0031] Preferably, the box body 1 includes an inner shell; horizontal circuit board grooves are provided on the upper and lower shell walls of the inner shell in the first partition for installing the rails 6; fixing holes are provided on one side shell wall of the inner shell in the second partition for installing the power conversion component 5.

[0032] A plurality of connectors are provided on the control panel to connect to the external power network.

[0033] The control board controls the signal source board to generate a measurement signal, which is output to the external power network connected to the control panel through the relay board; the relay board collects the signal of the external power network through the control panel and outputs it to the control board, and the control board collects and calculates the signal to analyze whether there is a fault in the external power network.

[0034] The control panel is connected to the power board to supply power to the power board. The power board converts the external power supply into direct current output. The direct current output by the power board is ±24V, which supplies power to the control board, relay board and signal source board.

[0035] The working principle of the monitoring host is as follows: The control board controls the signal source board to generate measurement signals, which are injected into the external power network through the connectors on the relay board and the control panel; the relay board collects the voltage signals of the power network through the control panel and then transmits them to the control board; the control board receives the voltage signals of the power network obtained by the relay board and calculates and analyzes whether there is a fault in the power network accessed by the monitoring host.

[0036] The beneficial effects of this embodiment are as follows: This monitoring host can inject measurement signals into the power network, collect the voltage signals of the power network, monitor the insulation state of the AC medium-voltage power grid, and timely detect whether there is a fault in the power grid, which is convenient for the maintenance and debugging of the power grid. By setting a circuit board slot inside the box body, the circuit board is fixed in the circuit board slot in a pluggable manner. While the circuit board will not shake when fixed, it can be easily inserted and removed up and down, thus facilitating the maintenance and replacement of the circuit board.

[0037] Embodiment Two

[0038] As Figure 1 、 2 and shown in 3, a monitoring host for insulation monitoring of an AC medium-voltage system, the monitoring host includes a box body 1 with a hollow interior and a box cover 2 detachably connected to the box body 1. It is characterized in that a control panel 3 is provided on the outer wall of the box body 1, and a circuit board 4 and a power conversion component 5 are provided inside the box body 1; the box body 1 includes a first partition and a second partition; the first partition includes two symmetrically arranged inner walls, the circuit board 4 is connected between the two inner walls, and a horizontal circuit board slot is provided on the inner wall. Guide rails 6 are provided at both ends of the circuit board 4 connected to the two side walls, and the circuit board 4 is fixed in the circuit board slot in a pluggable manner through the guide rails 6; the second partition includes fixing holes, and the power conversion component 5 is installed in the second partition through the fixing holes.

[0039] The control panel 3 is provided with a power switch 31, a fuse 32, an indicator light 33, and a number of electrical connectors.

[0040] The electrical connectors include a terminal block, a 30-core electrical connection, a 41-core electrical connection, a 14-core electrical connection, a 24-core electrical connection, and a number of 4-core electrical connections; the terminal block, fuse 32, power switch 31, and indicator light 33 are connected in sequence.

[0041] The circuit board 4 includes: a power supply board 41, a control board 42, a relay board 43, and a signal source board 44; the power supply board 41 is respectively connected to the control board 42, the relay board 43, and the signal source board 44, the control board 42 is connected to the relay board 43 and the signal source board 44, the relay board 43 is connected to the signal source board 44, and the control panel 3 is connected to the power supply board 41, the control board 42, the relay board 43, and the signal source board 44.

[0042] The power conversion component 5 includes: a filter 51 and a transformer 52; the filter 51, the transformer 52, and the power supply board 41 are connected in sequence.

[0043] The box body 1 includes an inner shell; the inner shell is provided with a horizontal circuit board slot on the upper and lower shell walls of the first partition for installing a guide rail 6; the inner shell is provided with a fixing hole on one side shell wall of the second partition for installing the power conversion component 5.

[0044] Preferably, a circuit board cover plate 7 is provided on the inner side of the box cover 2, and both ends of the circuit board cover plate 7 are connected to the shell wall of the inner shell to limit the circuit board 4.

[0045] Preferably, a partition board 8 is provided between two adjacent circuit boards 4 in the first partition, and a horizontal partition board slot is further provided on the inner wall of the first partition, and the partition board 8 is installed in the partition board slot. In actual use, the partition board can be made of a metal material, which can better reduce the electromagnetic interference between the circuit boards 4.

[0046] Preferably, the box cover 2 is detachably installed on the side of the box body 1 through fasteners.

[0047] Preferably, fixing plates 9 are provided at the four corners of the bottom of the box body, and the fixing plates 9 are provided with fixing holes. In actual use, bolts can be used to fix the intelligent collector in a certain position by using the fixing holes.

[0048] In this embodiment, the monitoring host is turned on through the power switch on the control panel. The fuse can provide overload protection for the monitoring host to prevent internal components from being burned out. The indicator light can display the power status of the monitoring host.

[0049] The terminal block, the fuse, the power switch, the indicator light, the filter, the transformer, and the power supply board are connected in sequence.

[0050] The terminal block on the control panel is connected to an external 220V AC power supply. The AC power supply is supplied to the power supply board through the filter and the transformer. The power supply board converts the AC power into DC power and outputs DC power of ±24V to supply power to the control board, the relay board, and the signal source board.

[0051] The control board controls the signal source board to generate measurement signals, which are output to the external power network connected to the control panel 3 through the relay board; the relay board collects the signals of the external power network through the control panel 3 and outputs them to the control board, and the control board collects and calculates the signals to analyze whether there is a fault in the external power network.

[0052] The 30-core electrical connection on the control panel is connected to the relay board, and the relay board collects the power network voltage signal through the 30-core electrical connection.

[0053] The 41-core electrical connection on the control panel is connected to the control board, and the power network switch status is collected through the 41-core electrical connection.

[0054] The 14-core electrical connection on the control panel is connected to the power supply board. The monitoring host can be externally connected to a display, and the external display is powered through the 14-core electrical connection.

[0055] The 24-core electrical connection on the control panel is connected to the control board, and the monitoring host can be externally connected to the Ethernet through the 24-core electrical connection.

[0056] The 4-core electrical connection on the control panel is connected to the control board, and the monitoring host can communicate and transmit with external devices such as intelligent collectors through the 4-core electrical connection.

[0057] The monitoring host can communicate through an externally connected Ethernet or by connecting to external devices such as intelligent collectors.

[0058] The working principle of the monitoring host is as follows: the control board controls the signal source board to generate measurement signals, which are injected into the power network through the relay board and the terminal block on the control panel; the relay board collects the power network voltage signal through the 30-core electrical connection and then transmits it to the control board; the control board receives the power network voltage signal obtained by the relay board and calculates and analyzes whether there is a fault in the power network accessed by the monitoring host.

[0059] The beneficial effect of this embodiment is that this monitoring host can inject measurement signals into the power network, collect the power network voltage signal, monitor the insulation state of the AC medium-voltage power grid, and timely detect whether there is a fault in the power grid, which is convenient for the maintenance and debugging of the power grid.

[0060] This monitoring host converts external AC power supply into DC power available internally to provide power for internal components; it has a cover plate that can be detachably installed on the box body, and the cover plate can be opened to repair and replace internal components, making disassembly, installation, maintenance, and repair more convenient; by setting a circuit board slot inside the box body, the circuit board is fixed in the circuit board slot in a pluggable manner. While the circuit board is fixed without shaking, it can be easily inserted and removed vertically, thus facilitating the repair and replacement of the circuit board; through the setting of a filter, power supply noise interference signals can be effectively eliminated, effectively improving the electromagnetic compatibility of the device and the reliability of the device operation; by setting an isolation board to isolate different circuit boards, electromagnetic interference between different circuit boards can be effectively reduced, increasing the working stability of the device; there are also fixing plates and fixing holes at the bottom for easy installation and fixation.

[0061] The overall structure of this monitoring host is simple, easy to manufacture and process, and convenient to use.

[0062] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claimed rights.

Claims

1. A monitoring host for insulation monitoring of an AC medium voltage system, the monitoring host comprising a hollow box body (1) and a box cover (2) detachably connected to the box body (1), characterized in that: A control panel (3) is arranged on the outer wall of the box body (1), and a circuit board (4) and a transformer assembly (5) are arranged inside the box body (1); the box body (1) comprises a first partition and a second partition; the first partition comprises two symmetrically arranged inner walls, the circuit board (4) is connected between the two inner walls, a transverse circuit board slot is arranged on the inner wall, guide rails (6) are arranged at both ends of the circuit board (4) where the two side walls are connected, and the circuit board (4) is pluggably fixed in the circuit board slot via the guide rails (6); the second partition comprises a fixing hole, and the transformer assembly (5) is installed in the second partition via the fixing hole.

2. The monitoring host according to claim 1, characterized in that: The control panel (3) is provided with a power switch (31), a fuse (32), an indicator light (33), and a plurality of electrical connectors.

3. The monitoring host according to claim 2, characterized in that: The electrical connector comprises a terminal block (341), a 30-core electrical connection (342), a 41-core electrical connection (343), a 14-core electrical connection (344), a 24-core electrical connection (345), and a plurality of 4-core electrical connections (346); the terminal block (341), a fuse (32), a power switch (31), and an indicator light (33) are connected in sequence.

4. The monitoring host according to claim 1, characterized in that: The circuit board (4) comprises: a power board (41), a control board (42), a relay board (43), and a signal source board (44); the power board (41) is connected to the control board (42), the relay board (43), and the signal source board (44) respectively; the control board (42) is connected to the relay board (43) and the signal source board (44); the relay board (43) is connected to the signal source board (44); and the control panel (3) is connected to the power board (41), the control board (42), the relay board (43), and the signal source board (44).

5. The monitoring host according to claim 1, characterized in that: The power conversion component (5) comprises: a filter (51) and a transformer (52); the filter (51), the transformer (52) and the power supply board (41) are connected in sequence.

6. The monitoring host according to claim 1, characterized in that: The box body (1) comprises an inner shell; the upper and lower shell walls of the inner shell located in the first partition are provided with transverse circuit board grooves for installing guide rails (6); the side shell wall of the inner shell located in the second partition is provided with fixing holes for installing power conversion components (5).

7. The monitoring host according to claim 6, characterized in that: A circuit board cover plate (7) is arranged on the inner side of the box cover (2), and two ends of the circuit board cover plate (7) are connected to the shell wall of the inner shell to define the circuit board (4).

8. The monitoring host according to claim 1, characterized in that: An isolation plate (8) is arranged between two adjacent circuit boards (4) of the first partition, and a transverse isolation plate groove is also arranged on the inner wall of the first partition, and the isolation plate (8) is installed in the isolation plate groove.

9. The monitoring host according to claim 1, characterized in that: The box cover (2) is detachably mounted on the side of the box body (1) via fasteners.

10. The monitoring host according to claim 1, characterized in that: Fixing plates (9) are arranged at the four corners of the bottom of the box body (1), and the fixing plates (9) are provided with fixing holes.

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