CN204595150U - A kind of direct-current insulation monitoring device - Google Patents
A kind of direct-current insulation monitoring device Download PDFInfo
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- CN204595150U CN204595150U CN201520208452.9U CN201520208452U CN204595150U CN 204595150 U CN204595150 U CN 204595150U CN 201520208452 U CN201520208452 U CN 201520208452U CN 204595150 U CN204595150 U CN 204595150U
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Abstract
The utility model provides a kind of direct-current insulation monitoring device, can solve in direct-current insulation monitoring device to exist to fail to report wrong report phenomenon.Described device comprises: at least one current transducer, acquisition module, microcomputer, stabilized voltage supply and the display be connected with described microcomputer and alarm; Described current transducer, for gathering the current signal of each branch road in straight-flow system; Described acquisition module, for carrying out analog to digital conversion to the current signal obtained; Described microcomputer, for when positive and negative busbar insulation against ground resistance is lower than the alarm threshold value preset, patrols and examines each branch road in straight-flow system; Described display, the warning message that--insulation against ground resistance value of time curve, each branch road--time curve and microcomputer generate for showing positive and negative busbar insulation against ground resistance value; Described alarm, for display alarm information.The utility model is applicable to electronic circuit technology neck.
Description
Technical field
The utility model relates to electronic circuit technology field, refers to a kind of direct-current insulation monitoring device especially.
Background technology
Three phase #5 machine straight-flow system seals are Shenzhen Ke Lu Electronic Co., Ltd. product, model is: CL6884, wherein, 110V straight-flow system is control A group DC bus insulating monitor and B group DC bus insulating monitor respectively, normal operating mode is two sections of DC control buses independent operatings separately, when two sections of bus parallel runnings, wherein a set of insulating monitor is out of service; 220V power DC bus is a set of insulating monitor, shown in Fig. 1.When to be designed to 110V straight-flow system be 7 Κ Ω-10 Κ Ω, insulating monitor sends light and sound equipment anticipating signal; When 220V straight-flow system is 15 Κ Ω-20 Κ Ω, insulating monitor sends light and sound equipment anticipating signal.
In several years of the operation of #5 machine straight-flow system seal, because this device is the old product that Ke Lu company produces, of the remote past, product design Shortcomings, also exist when the impartial decline simultaneously of straight-flow system positive pole, negative insulation resistance, the electric bridge that DC system insulation monitoring device is formed still is in weighing apparatus state, can not be warned the defect of signal, can not accurately select warning branch road at work, often occur ground connection wrong report phenomenon, manufacturer repeatedly arrives scene and carries out upgrading and still can not deal with problems.Not only endanger equipment healthy, add workload, also reduce the reliability of DC network work, become a hidden trouble of #5 machine safe and stable operation.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of direct-current insulation monitoring device, with solve existing for prior art when straight-flow system positive pole, negative insulation resistance simultaneously impartial decline when, the electric bridge that DC system insulation monitoring device is formed still is in weighing apparatus state, can not be warned the defect of signal, can not accurately select warning branch road at work, often occur the problem that ground connection is reported by mistake.
For solving the problems of the technologies described above, the utility model embodiment provides a kind of direct-current insulation monitoring device, comprising: at least one current transducer, acquisition module, microcomputer, stabilized voltage supply and the display be connected with described microcomputer and alarm;
Described current transducer, for gathering the current signal of each branch road in straight-flow system;
Described acquisition module, for obtaining the current signal that current transducer gathers, carries out analog to digital conversion to described current signal, and the current signal after conversion is sent to described microcomputer;
Described microcomputer, for detecting voltage-to-ground, the positive and negative busbar insulation against ground resistance of positive and negative DC bus in real time, and when positive and negative busbar insulation against ground resistance is lower than the alarm threshold value preset, patrols and examines each branch road in straight-flow system;
Described display,--the warning message that time curve, positive and negative busbar insulation against ground resistance value--insulation against ground resistance value of time curve, each branch road--time curve and microcomputer generate for showing the voltage-to-ground value of positive and negative busbar;
Described alarm, sends warning message for the insulation against ground resistance value when positive and negative busbar insulation against ground resistance value, each branch road lower than during the alarm threshold value preset;
Described stabilized voltage supply, for providing power supply for described current transducer, acquisition module, microcomputer.
Alternatively, described current transducer is active electric current transmitter.
Alternatively, described acquisition module comprises: voltage sample circuit, analog to digital converter, sender unit, multi-channel switch;
Described multi-channel switch, for selecting the branch road in straight-flow system;
Described sender unit, for being sent to analog to digital converter by by the current signal of branch road selected;
Described voltage sample circuit, for gathering the voltage-to-ground value in straight-flow system between positive and negative busbar;
Described analog to digital converter, current signal for being sent by sender unit is converted to digital current signal, and the voltage-to-ground value between the positive and negative busbar of voltage sample circuit collection is converted to digital voltage signal, and described digital current signal and digital voltage signal are sent to described microcomputer.
Alternatively, described microcomputer, for gathering the voltage-to-ground of positive and negative DC bus, generates positive and negative busbar insulation against ground resistance, and according to the digital current signal received and digital voltage signal, generates the insulating resistance value of respective branch.
Alternatively, the signal of described acquisition module is uploaded to described microcomputer by serial ports.
The beneficial effect of technique scheme of the present utility model is as follows:
In such scheme, by utilizing the microcomputer 3 of electrical bridge principle to monitor straight-flow system positive and negative busbar voltage, when busbar voltage sends warning message lower than during predetermined threshold value; And according to the insulation against ground resistance of described positive and negative busbar voltage determination positive and negative busbar, when the insulation against ground resistance of positive and negative busbar sends warning message lower than during the alarm threshold value preset, and automatically start Branch-circuit check function, to patrol each branch road insulation against ground resistance, branch road accuracy of detection is high, speed is fast, and antijamming capability is strong, successfully solves in direct-current insulation monitoring device to exist to fail to report wrong report phenomenon.
Accompanying drawing explanation
The structural representation of the direct-current insulation monitoring device before the transformation that Fig. 1 provides for the utility model embodiment;
The structural representation of the improved direct-current insulation monitoring device that Fig. 2 provides for the utility model embodiment.
[main element symbol description]
1: current transducer;
2: acquisition module;
3: microcomputer;
4: display;
5: alarm;
6: stabilized voltage supply.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The utility model for existing when straight-flow system positive pole, negative insulation resistance simultaneously impartial decline when, the electric bridge that DC system insulation monitoring device is formed still is in weighing apparatus state, can not be warned the defect of signal, can not accurately select warning branch road at work, often occur the problem that ground connection is reported by mistake providing a kind of direct-current insulation monitoring device.
Be illustrated in figure 2 the structural representation of a kind of direct-current insulation monitoring device that the utility model embodiment provides, comprise: at least one current transducer 1, acquisition module 2, microcomputer 3, stabilized voltage supply 6 and the display 4 be connected with described microcomputer 3 and alarm 5;
Described current transducer 1, for gathering the current signal of each branch road in straight-flow system;
Described acquisition module 2, for obtaining the current signal that current transducer 1 gathers, carries out analog to digital conversion to described current signal, and the current signal after conversion is sent to described microcomputer 3;
Described microcomputer 3, for detecting voltage-to-ground, the positive and negative busbar insulation against ground resistance of positive and negative DC bus in real time, and when positive and negative busbar insulation against ground resistance is lower than the alarm threshold value preset, patrols and examines each branch road in straight-flow system;
Described display 4,--the warning message that time curve, positive and negative busbar insulation against ground resistance value--insulation against ground resistance value of time curve, each branch road--time curve and microcomputer 3 generate for showing the voltage-to-ground value of positive and negative busbar;
Described alarm 5, sends warning message for the insulation against ground resistance value when positive and negative busbar insulation against ground resistance value, each branch road lower than during the alarm threshold value preset;
Described stabilized voltage supply 6, for providing power supply for described current transducer 1, acquisition module 2, microcomputer 3.
Direct-current insulation monitoring device described in the utility model embodiment, by utilizing the microcomputer 3 of electrical bridge principle to monitor straight-flow system positive and negative busbar voltage, when busbar voltage sends warning message lower than during predetermined threshold value; And according to the insulation against ground resistance of described positive and negative busbar voltage determination positive and negative busbar, when the insulation against ground resistance of positive and negative busbar sends warning message lower than during the alarm threshold value preset, and automatically start Branch-circuit check function, to patrol each branch road insulation against ground resistance, branch road accuracy of detection is high, speed is fast, and antijamming capability is strong, successfully solves in direct-current insulation monitoring device to exist to fail to report wrong report phenomenon.
In the embodiment of the present invention, the technical parameter of improved direct-current insulation monitoring device is referring to table 1:
Table 1
In the embodiment of aforementioned direct-current insulation monitoring device, alternatively, described current transducer 1 is active electric current transmitter 1.
In the utility model embodiment, patrol and examine in process at each, adopt active electric current transmitter 1 to complete branch road leakage current test, do not need to straight-flow system Injection Signal.Normally work without impact on straight-flow system, the impact of straight-flow system on earth capacitance can be eliminated, the leakage current test of all branch roads carries out simultaneously, and a polling rate is basic and branch road quantity has nothing to do, current transducer 1 can eliminate the impact of the remanent magnetism after heavy current impact, ensures the long-time stability that current transducer 1 works.
In the embodiment of aforementioned direct-current insulation monitoring device, alternatively, the signal of described acquisition module 2 is uploaded to described microcomputer 3 by serial ports.
In the embodiment of aforementioned direct-current insulation monitoring device, alternatively, described acquisition module 2 comprises: voltage sample circuit, analog to digital converter, sender unit, multi-channel switch;
Described multi-channel switch, for selecting the branch road in straight-flow system;
Described sender unit, for being sent to analog to digital converter by by the current signal of branch road selected;
Described voltage sample circuit, for gathering the voltage-to-ground value in straight-flow system between positive and negative busbar;
Described analog to digital converter, current signal for being sent by sender unit is converted to digital current signal, and the voltage-to-ground value between the positive and negative busbar of voltage sample circuit collection is converted to digital voltage signal, and described digital current signal and digital voltage signal are sent to described microcomputer 3.
In the utility model embodiment, tested signal (current signal) is sent to acquisition module 2 by sender unit after being gathered by current transducer 1, the circuit signal gathered directly is converted to digital current signal in acquisition module 2 inside by analog to digital converter, gather the voltage-to-ground value in straight-flow system between positive and negative busbar by voltage sample circuit simultaneously, and by described analog to digital converter, the voltage-to-ground value between the positive and negative busbar of voltage sample circuit collection is converted to digital voltage signal, and described digital current signal and digital voltage signal are sent to described microcomputer 3, digital data transmission is adopted between acquisition module 2 and microcomputer 3, greatly reduce connecting line between acquisition module 2 and microcomputer 3 and easy to use, branch road accuracy of detection is high, speed is fast, antijamming capability is strong, successfully solve in DC earthing pick-up unit to exist and fail to report wrong report phenomenon, moreover, can also effectively monitor loop ground connection, straight-flow system insulating ground problem can be processed effectively in time.
In the embodiment of aforementioned direct-current insulation monitoring device, alternatively, described microcomputer 3, for gathering the voltage-to-ground of positive and negative DC bus, generate positive and negative busbar insulation against ground resistance, and according to the digital current signal received and digital voltage signal, generate the insulating resistance value of respective branch.
In the utility model embodiment, described microcomputer 3 is according to the voltage-to-ground of the positive and negative DC bus gathered, generate positive and negative busbar insulation against ground resistance and positive and negative busbar insulation against ground resistance-time curve, and according to the digital current signal received and digital voltage signal, generate the insulating resistance value of respective branch and the insulating resistance value-time curve of branch road, and can also automatically lock and store the insulating resistance value-time curve of positive and negative busbar insulation against ground resistance-time plot and branch road, insulating resistance value-the time curve of described positive and negative busbar insulation against ground resistance-time plot and branch road can display 4 show in real time again, be convenient to man-machine conversation.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some transformations and retouching, these transformations and retouching also should be considered as protection domain of the present utility model.
Claims (5)
1. a direct-current insulation monitoring device, is characterized in that, comprising: at least one current transducer, acquisition module, microcomputer, stabilized voltage supply and the display be connected with described microcomputer and alarm;
Described current transducer, for gathering the current signal of each branch road in straight-flow system;
Described acquisition module, for obtaining the current signal that current transducer gathers, carries out analog to digital conversion to described current signal, and the current signal after conversion is sent to described microcomputer;
Described microcomputer, for detecting voltage-to-ground, the positive and negative busbar insulation against ground resistance of positive and negative DC bus in real time, and when positive and negative busbar insulation against ground resistance is lower than the alarm threshold value preset, patrols and examines each branch road in straight-flow system;
Described display,--the warning message that time curve, positive and negative busbar insulation against ground resistance value--insulation against ground resistance value of time curve, each branch road--time curve and microcomputer generate for showing the voltage-to-ground value of positive and negative busbar;
Described alarm, sends warning message for the insulation against ground resistance value when positive and negative busbar insulation against ground resistance value, each branch road lower than during the alarm threshold value preset;
Described stabilized voltage supply, for providing power supply for described current transducer, acquisition module, microcomputer.
2. device according to claim 1, is characterized in that, described current transducer is active electric current transmitter.
3. device according to claim 1, is characterized in that, described acquisition module comprises: voltage sample circuit, analog to digital converter, sender unit, multi-channel switch;
Described multi-channel switch, for selecting the branch road in straight-flow system;
Described sender unit, for being sent to analog to digital converter by by the current signal of branch road selected;
Described voltage sample circuit, for gathering the voltage-to-ground value in straight-flow system between positive and negative busbar;
Described analog to digital converter, current signal for being sent by sender unit is converted to digital current signal, and the voltage-to-ground value between the positive and negative busbar of voltage sample circuit collection is converted to digital voltage signal, and described digital current signal and digital voltage signal are sent to described microcomputer.
4. device according to claim 1, is characterized in that, described microcomputer, for gathering the voltage-to-ground of positive and negative DC bus, generate positive and negative busbar insulation against ground resistance, and according to the digital current signal received and digital voltage signal, generate the insulating resistance value of respective branch.
5. device according to claim 1, is characterized in that, the signal of described acquisition module is uploaded to described microcomputer by serial ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520208452.9U CN204595150U (en) | 2015-04-08 | 2015-04-08 | A kind of direct-current insulation monitoring device |
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| CN201520208452.9U CN204595150U (en) | 2015-04-08 | 2015-04-08 | A kind of direct-current insulation monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938175A (en) * | 2016-05-31 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DSP-based DC system instantaneous grounding online monitoring method and apparatus manufacture |
| CN111766537A (en) * | 2020-07-29 | 2020-10-13 | 海南电网有限责任公司电力科学研究院 | Insulation trend analysis method for direct current system |
-
2015
- 2015-04-08 CN CN201520208452.9U patent/CN204595150U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938175A (en) * | 2016-05-31 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DSP-based DC system instantaneous grounding online monitoring method and apparatus manufacture |
| CN105938175B (en) * | 2016-05-31 | 2019-03-12 | 贵阳英纳瑞电气有限公司 | Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP |
| CN111766537A (en) * | 2020-07-29 | 2020-10-13 | 海南电网有限责任公司电力科学研究院 | Insulation trend analysis method for direct current system |
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