Signal acquisition module structure with alarm function

Abstract

A signal acquisition module structure with an alarm function is characterized in that a signal acquisition unit is electrically connected with a microprocessor, and the signal acquisition unit is used for acquiring a current transformer signal of a feeder branch of a direct current system; the indicator light control sub-module is electrically connected with the microprocessor, and the indicator light control sub-module is used for indicating the state of the feeder branch of the direct current system according to the current transformer signal acquired by the signal acquisition unit; the communication sub-module is electrically connected with the microprocessor, the communication sub-module is also electrically connected with the insulation monitoring host, and the insulation monitoring host is used for monitoring the insulation capability of the direct current system bus; the display submodule is electrically connected with the microprocessor, and the display submodule is used for displaying the alarm information of the feeder branch of the direct current system. According to the utility model, the design is simplified, on-site installation and wiring work is reduced, and operation and maintenance personnel can master feeder branch state information, fault properties and the like in the fault split screen at the first time.

Description

Technical Field

[0001] The utility model relates to a signal acquisition module structure with an alarm function, belonging to the technical field of insulation detection for feeder branches in a DC system. Background Art

[0002] At present, the insulation monitoring device for the station DC system generally adopts a modular design for the insulation detection of feeder branches. Since there are many feeder circuits in systems of 220 kV and above, the number of sub-panels carried is large, and the number of signal acquisition modules required is also large. When the distance between the sub-panel and the main panel is far or the main and sub-panels are not in the same small room, a sub-machine is generally installed on the sub-panel to view the insulation status of the feeder branches in the sub-panel and the alarm branch information. The sub-machine "connects to the upper" the host and "connects to the lower" the modules in the corresponding sub-panel. It transmits the received host instructions to the modules connected to it and sends the data uploaded by the modules to the host.

[0003] However, at the present stage, after installing the sub-machine, when the interfaces of the main and sub-machines and the interfaces of the host and the modules use different circuits respectively, the modules originally directly connected to the host are connected to the host through the sub-machine, increasing the complexity of the system software, hardware and on-site wiring, and also weakening the real-time detection ability of the system for feeder insulation; when the communication between the main and sub-machines shares the interfaces of the host and the modules, the number of modules connected to the host is reduced, increasing the data traffic of the communication channels between the host and the modules and slowing down the communication speed between the host and the modules; limited by the installation space, it is very difficult to install the sub-machine on some sub-panels. Summary of the Utility Model

[0004] Therefore, the utility model provides a signal acquisition module structure with an alarm function, which solves the problems that the traditional technology is prone to weaken the real-time detection ability of the system for feeder insulation and slow down the communication speed between the host and the modules.

[0005] In order to achieve the above object, the utility model provides the following technical solution: A signal acquisition module structure with an alarm function, comprising a signal acquisition unit, a microprocessor, an indicator light control sub-module, a communication sub-module and a display sub-module;

[0006] The signal acquisition unit is electrically connected to the microprocessor, and the signal acquisition unit is used for acquiring the current transformer signals of the feeder branches in the DC system;

[0007] The indicator light control sub-module is electrically connected to the microprocessor, and the indicator light control sub-module is used for indicating the state of the feeder branches in the DC system according to the current transformer signals acquired by the signal acquisition unit;

[0008] The communication sub-module is electrically connected to the microprocessor, and the communication sub-module is also electrically connected to an insulation monitoring host, which is used to monitor the insulation ability of the DC system busbar;

[0009] The display sub-module is electrically connected to the microprocessor, and the display sub-module is used to display the alarm information of the DC system feeder branch.

[0010] As a preferred structure of the signal acquisition module with an alarm function, the signal acquisition unit has sixteen channels, and the signal acquisition unit includes signal acquisition units A1 to A16; the signal acquisition units A1 to A16 are respectively connected to the current transformers of a DC system feeder branch.

[0011] As a preferred structure of the signal acquisition module with an alarm function, the indicator light control sub-module uses a serial input / output and parallel output shift register with the model number 74HC595.

[0012] As a preferred structure of the signal acquisition module with an alarm function, the indicator light control sub-module includes shift registers U1, U2, U3, and U4;

[0013] The shift registers U1, U2, U3, and U4 are cascaded to indicate the states of 16 DC system feeder branches.

[0014] As a preferred structure of the signal acquisition module with an alarm function, the indicator light control sub-module is configured with sixteen branch status indicator lights; the sixteen branch status indicator lights include LED1 to LED16;

[0015] LED1, LED2, LED3, and LED4 are connected to the shift register U1;

[0016] LED5, LED6, LED7, and LED8 are connected to the shift register U2;

[0017] LED9, LED10, LED11, and LED12 are connected to the shift register U3;

[0018] LED13, LED14, LED15, and LED16 are connected to the shift register U4.

[0019] As a preferred structure of the signal acquisition module with an alarm function, the indicator light control sub-module is configured with module operation indicator lights, and the module operation indicator lights include a power indicator light, an operation indicator light, an alarm indicator light, a communication indicator light, and a synchronization indicator light.

[0020] As a preferred structure of the signal acquisition module with an alarm function, a signal acquisition panel is also configured; sixteen current transformer signal input terminals are provided at the edge of the signal acquisition panel, and sixteen branch status indicators correspond to the sixteen current transformer signal input terminals;

[0021] A current transformer common ground terminal input terminal is also provided at the edge of the signal acquisition panel.

[0022] As a preferred structure of the signal acquisition module with an alarm function, the display sub-module is configured with a liquid crystal display integrated on the signal acquisition panel;

[0023] The communication sub-module is configured with a CAN port integrated on the signal acquisition panel.

[0024] As a preferred structure of the signal acquisition module with an alarm function, a power supply sub-module is further included, and the power supply sub-module is electrically connected to the microprocessor;

[0025] The power supply sub-module is configured with a module working power supply interface integrated on the signal acquisition panel, and the module working power supply interface is used to supply power to the signal acquisition module.

[0026] The present utility model has the following advantages: it includes a signal acquisition unit, a microprocessor, an indicator light control sub-module, a communication sub-module, and a display sub-module; the signal acquisition unit is electrically connected to the microprocessor, and the signal acquisition unit is used to acquire the current transformer signals of the DC system feeder branches; the indicator light control sub-module is electrically connected to the microprocessor, and the indicator light control sub-module is used to indicate the status of the DC system feeder branches according to the current transformer signals acquired by the signal acquisition unit; the communication sub-module is electrically connected to the microprocessor, and the communication sub-module is also electrically connected to an insulation monitoring host, and the insulation monitoring host is used to monitor the insulation ability of the DC system bus; the display sub-module is electrically connected to the microprocessor, and the display sub-module is used to display the alarm information of the DC system feeder branches. The present utility model simplifies the circuit design, reduces the on-site installation and wiring work, ensures the reliability of the device while also saving production costs, and at the same time, the status information of each feeder branch in the sub-screen is clear, which is convenient for the operation and maintenance personnel to master the status information and fault nature of the feeder branches in the fault sub-screen in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0028] The structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0029] Figure 1 It is a schematic structural framework diagram of a signal acquisition module with an alarm function provided in an embodiment of the present utility model;

[0030] Figure 2 It is a schematic circuit diagram of an indicator light control sub-module of a signal acquisition module with an alarm function provided in an embodiment of the present utility model;

[0031] Figure 3 It is a schematic diagram of a signal acquisition panel of a signal acquisition module with an alarm function provided in an embodiment of the present utility model;

[0032] Figure 4 It is an application schematic diagram of a signal acquisition module with an alarm function provided in an embodiment of the present utility model.

[0033] In the figure, 1 is a signal acquisition unit; 2 is a microprocessor; 3 is an indicator light control sub-module; 4 is a communication sub-module; 5 is a display sub-module; 6 is an insulation monitoring host; 7 is a module operation indicator light; 8 is a signal acquisition panel; 9 is a current transformer signal input terminal; 10 is a current transformer common ground terminal input terminal; 11 is a liquid crystal display screen; 12 is a CAN port; 13 is a power supply sub-module; 14 is a module working power supply interface; 15 is a branch status indicator light. Specific Embodiments

[0034] The following specific embodiments illustrate the implementation manners of the present utility model. Those familiar with this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] See Figure 1 、 Figure 2 and Figure 3 An embodiment of the present utility model provides a signal acquisition module structure with an alarm function, including a signal acquisition unit 1, a microprocessor 2, an indicator light control sub-module 3, a communication sub-module 4, and a display sub-module 5;

[0036] Among them, the signal acquisition unit 1 is electrically connected to the microprocessor 2, and the signal acquisition unit 1 is used to acquire the current transformer signals of the feeder branches of the DC system;

[0037] Among them, the indicator light control sub-module 3 is electrically connected to the microprocessor 2, and the indicator light control sub-module 3 is used to indicate the status of the feeder branches of the DC system according to the current transformer signals acquired by the signal acquisition unit 1;

[0038] Among them, the communication sub-module 4 is electrically connected to the microprocessor 2, and the communication sub-module 4 is also electrically connected to the insulation monitoring host 6, and the insulation monitoring host 6 is used to monitor the insulation ability of the DC system bus;

[0039] Among them, the display sub-module 5 is electrically connected to the microprocessor 2, and the display sub-module 5 is used to display the alarm information of the feeder branches of the DC system.

[0040] In this embodiment, the signal acquisition unit 1 has sixteen channels, and the signal acquisition unit 1 includes signal acquisition units A1 to A16; the signal acquisition units A1 to A16 are respectively connected to the current transformers of a feeder branch of the DC system; the indicator light control sub-module 3 adopts a serial input / output and parallel output shift register of model 74HC595; the indicator light control sub-module 3 includes shift registers U1, U2, U3, and U4; the shift registers U1, U2, U3, and U4 are cascaded to indicate the status of 16 feeder branches of the DC system.

[0041] Among them, the indicator light control sub-module 3 is configured with sixteen branch status indicator lights 15; the sixteen branch status indicator lights 15 include LED1 to LED16; LED1, LED2, LED3, and LED4 are connected to the shift register U1; LED5, LED6, LED7, and LED8 are connected to the shift register U2; LED9, LED10, LED11, and LED12 are connected to the shift register U3; LED13, LED14, LED15, and LED16 are connected to the shift register U4.

[0042] Specifically, the signal acquisition module has functions such as branch name (actual in-station branch name), status display, and branch alarm, and integrates the extension functions into the signal acquisition module. Taking a signal acquisition module connected to sixteen current transformers as an example, there are 16 status indicator lights in the signal acquisition module that need to be controlled, and each status indicator light requires two control ports, so a total of 16×2 = 32 control ports are needed. To save the I / O ports of the microprocessor 2, an indicator light control sub-module 3 with serial input and parallel output is used to control the status indicator lights. The indicator light control sub-module 3 uses a 74HC595 chip as a shift register for serial input / output and parallel output, with 8 output ports. By cascading four 74HC595 chips, the microprocessor 2 can control the four states of 16 status indicator lights.

[0043] Among them, in order to present various states of the feeder branch, the DC system feeder branch status indicator light 15 uses a two-color light (taking a red-green two-color light as an example):

[0044] 1) When the DC system feeder branch is working normally and the insulation of the DC system feeder branch is normal, the corresponding status indicator light shows green;

[0045] 2) When the insulation ability of the DC system feeder branch decreases but is higher than the grounding alarm threshold, the corresponding status indicator light flashes green;

[0046] 3) When the current transformer of the DC system feeder branch falls off, the corresponding status indicator light flashes red;

[0047] 4) When the DC system feeder branch has an insulation alarm (the insulation of the DC system feeder branch is lower than the grounding alarm threshold), the corresponding status indicator light shows red.

[0048] In this embodiment, the indicator light control sub-module 3 is configured with a module operation indicator light 7. The module operation indicator light 7 includes a power indicator light, an operation indicator light, an alarm indicator light, a communication indicator light, and a synchronization indicator light. The power indicator light is used to indicate the power status of the signal acquisition module, the operation indicator light is used to indicate the operation status of the signal acquisition module, the communication indicator light is used to indicate the communication status of the signal acquisition module, and the synchronization indicator light is used to indicate the synchronization status of the signal acquisition module.

[0049] See Figure 3, in this embodiment, a signal acquisition panel 8 is also configured; sixteen current transformer signal input terminals 9 are provided at the edge of the signal acquisition panel 8, and sixteen branch status indicators 15 correspond to the sixteen current transformer signal input terminals 9 one by one; a current transformer common ground terminal input terminal 10 is also provided at the edge of the signal acquisition panel 8; the display sub-module 5 is configured with a liquid crystal display screen 11 integrated on the signal acquisition panel 8; the communication sub-module 4 is configured with a CAN port 12 integrated on the signal acquisition panel 8; in addition, a power supply sub-module 13 is further included, and the power supply sub-module 13 is electrically connected to the microprocessor 2; the power supply sub-module 13 is configured with a module working power supply interface 14 integrated on the signal acquisition panel 8, and the module working power supply interface 14 is used to supply power to the signal acquisition module.

[0050] Specifically, the LED1~LED16 status indicators are arranged in sequence beside the corresponding current transformer signal input terminals 9, corresponding to the current transformer signal input terminals 9 one by one. The liquid crystal display screen 11 is arranged in the middle of the signal acquisition panel 8, and the display content includes module address, alarm branch number (internal branch number of the module, corresponding to the CT input serial number one by one), branch name, branch fault type, branch insulation resistance value, alarm time and other information. The CAN port 12 is used for communication with the insulation monitoring host 6, and the module working power supply interface 14 is used for external power supply. The overall size structure of the signal acquisition module and the wiring method with the host and current transformer are not changed, and on-site upgrading and transformation can be realized by replacing the signal acquisition module and upgrading the monitoring host software; without installing a sub-machine in the sub-screen, the fault branch, branch name, branch fault nature, alarm time and other information of the sub-screen can be viewed without checking the host alarm information, which simplifies the hardware circuit and program software design of the insulation monitoring device, reduces the on-site installation and wiring work of the device, ensures the reliability of the device and saves production costs at the same time. The alarm branch number corresponds to the specific name of the DC panel branch one by one, and there is no need to check the comparison table and the specific branch wiring.

[0051] See Figure 4 , in the application scenario of the signal acquisition module, the insulation monitoring host detects the insulation of the DC bus system. When the system insulation drops below the alarm threshold, the insulation monitoring host starts the bridge-changing signal (similar to a low-frequency AC signal), and the signal acquisition module collects the current signals of the current transformers installed on each branch (with the same frequency as the bridge-changing signal), and judges the size of the branch grounding resistance (branch insulation) according to the current signal. The smaller the resistance, the lower the insulation level of the branch, and the larger the resistance, the better the insulation level of the branch (under normal circumstances, the branch insulation is infinite).

[0052] In summary, the utility model includes a signal acquisition unit 1, a microprocessor 2, an indicator light control sub-module 3, a communication sub-module 4, and a display sub-module 5; the signal acquisition unit 1 is electrically connected to the microprocessor 2, and the signal acquisition unit 1 is used to acquire the current transformer signals of the feeder branches of the DC system; the indicator light control sub-module 3 is electrically connected to the microprocessor 2, and the indicator light control sub-module 3 is used to indicate the status of the feeder branches of the DC system according to the current transformer signals acquired by the signal acquisition unit 1; the communication sub-module 4 is electrically connected to the microprocessor 2, and the communication sub-module 4 is also electrically connected to an insulation monitoring host 6, and the insulation monitoring host 6 is used to monitor the insulation ability of the DC system bus; the display sub-module 5 is electrically connected to the microprocessor 2, and the display sub-module 5 is used to display the alarm information of the feeder branches of the DC system. The signal acquisition module of the utility model has functions such as branch name (actual branch name in the station), status display, and branch alarm, and integrates the extension function into the signal acquisition module. Taking a signal acquisition module connected to sixteen current transformers as an example, there are 16 status indicator lights in the signal acquisition module that need to be controlled, and each status indicator light requires two control ports, for a total of 16×2 = 32 control ports. To save the I / O ports of the microprocessor 2, a serial input parallel output indicator light control sub-module 3 is used to control the status indicator lights. The indicator light control sub-module 3 uses a 74HC595 chip, which is used as a serial input / output and parallel output shift register and has 8 output ports. By cascading four 74HC595 chips, the microprocessor 2 can control the four states of 16 status indicator lights. The LED1~LED16 status indicator lights are arranged in sequence beside the corresponding current transformer signal input terminals 9, corresponding one by one to the current transformer signal input terminals 9. The liquid crystal display screen 11 is arranged in the middle of the signal acquisition panel 8, and the display content includes module address, alarm branch number (internal branch number of the module, corresponding one by one to the input sequence number of the current transformer CT), branch name, branch fault type, branch insulation resistance value, alarm time and other information. The CAN port 12 is used to communicate with the insulation monitoring host 6, and the module working power supply interface 14 is used for external power supply. The overall size structure of the signal acquisition module and the wiring method with the host and the current transformer are not changed, and on-site upgrading and transformation can be achieved by replacing the signal acquisition module and upgrading the software of the monitoring host; without installing an extension in the sub-screen, the fault branch, branch name, branch fault nature, alarm time and other information of this sub-screen can be viewed without checking the host alarm information, which simplifies the hardware circuit and program software design of the insulation monitoring device, reduces the on-site installation and wiring work of the device, ensures the reliability of the device, and saves production costs at the same time. The alarm branch number corresponds one by one to the specific name of the DC panel branch, and there is no need to check the comparison table or the specific branch wiring.

[0053] In the foregoing, the present utility model has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present utility model, several conventional adjustments or further innovations can also be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present utility model, the technical solutions obtained from these conventional adjustments or further innovations also fall within the protection scope of the claims of the present utility model.

Claims

1. A signal acquisition module structure with an alarm function, characterized in that, It includes a signal acquisition unit (1), a microprocessor (2), an indicator light control sub-module (3), a communication sub-module (4) and a display sub-module (5); The signal acquisition unit (1) is electrically connected to the microprocessor (2), and the signal acquisition unit (1) is used to acquire the current transformer signals of the feeder branches of the DC system; The indicator light control sub-module (3) is electrically connected to the microprocessor (2), and the indicator light control sub-module (3) is used to indicate the status of the feeder branches of the DC system according to the current transformer signals acquired by the signal acquisition unit (1); The communication sub-module (4) is electrically connected to the microprocessor (2), and the communication sub-module (4) is also electrically connected to an insulation monitoring host (6), and the insulation monitoring host (6) is used to monitor the insulation ability of the DC system bus; The display sub-module (5) is electrically connected to the microprocessor (2), and the display sub-module (5) is used to display the alarm information of the feeder branches of the DC system.

2. The structure of a signal acquisition module with an alarm function according to claim 1, characterized in that, The signal acquisition unit (1) has sixteen channels, and the signal acquisition unit (1) includes signal acquisition units A1 to A16; the signal acquisition units A1 to A16 are respectively connected to the current transformers of a feeder branch of the DC system.

3. A signal acquisition module structure with an alarm function according to claim 1, characterized in that, The indicator light control sub-module (3) uses a serial input / output and parallel output shift register of model 74HC595.

4. The structure of a signal acquisition module with an alarm function according to claim 3, characterized in that, The indicator light control sub-module (3) includes shift registers U1, U2, U3, and U4; The shift registers U1, U2, U3, and U4 are cascaded to indicate the status of 16 feeder branches of the DC system.

5. The structure of a signal acquisition module with an alarm function according to claim 4, characterized in that, The indicator light control sub-module (3) is configured with sixteen branch status indicator lights (15); the sixteen branch status indicator lights (15) include LED1 to LED16; LED1, LED2, LED3, and LED4 are connected to the shift register U1; LED5, LED6, LED7, and LED8 are connected to the shift register U2; LED9, LED10, LED11, and LED12 are connected to the shift register U3; LED13, LED14, LED15, and LED16 are connected to the shift register U4.

6. The structure of a signal acquisition module with an alarm function according to claim 4, characterized in that, The indicator light control sub-module (3) is configured with a module operation indicator light (7), and the module operation indicator light (7) includes a power indicator light, an operation indicator light, an alarm indicator light, a communication indicator light, and a synchronization indicator light.

7. The structure of a signal acquisition module with an alarm function according to claim 6, characterized in that, A signal acquisition panel (8) is also configured; sixteen current transformer signal input terminals (9) are provided at the edge of the signal acquisition panel (8), and the sixteen branch status indicator lights (15) correspond to the sixteen current transformer signal input terminals (9); A current transformer common ground terminal input terminal (10) is also provided at the edge of the signal acquisition panel (8).

8. A signal acquisition module structure with an alarm function according to claim 7, characterized in that, The display sub-module (5) is configured with a liquid crystal display screen (11) integrated on the signal acquisition panel (8); The communication sub-module (4) is configured with a CAN port (12) integrated on the signal acquisition panel (8).

9. The structure of a signal acquisition module with an alarm function according to claim 8, characterized in that, It further includes a power supply sub-module (13), which is electrically connected between the power supply sub-module (13) and the microprocessor (2); The power supply sub-module (13) is configured with a module working power supply interface (14) integrated on the signal acquisition panel (8), and the module working power supply interface (14) is used to supply power to the signal acquisition module.

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