CN204882720U - Intelligent computer direct current system monitoring facilities - Google Patents
Intelligent computer direct current system monitoring facilities Download PDFInfo
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- CN204882720U CN204882720U CN201520613817.6U CN201520613817U CN204882720U CN 204882720 U CN204882720 U CN 204882720U CN 201520613817 U CN201520613817 U CN 201520613817U CN 204882720 U CN204882720 U CN 204882720U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 238000004092 self-diagnosis Methods 0.000 description 1
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Abstract
The utility model relates to an intelligent computer direct current system monitoring facilities belongs to the direct current system monitoring technology field. The utility model discloses a direct current system monitoring facilities includes the electric bridge board, the electric bridge board includes electric bridge and electric bridge control circuit, this electric bridge control circuit includes MCU and the busbar voltage detection branch road and hourglass current detection branch road be connected with MCU, busbar voltage detects the branch road and is arranged in detecting electric bridge positive bus -bar voltage -to -ground, negative busbar voltage -to -ground and just, voltage between the negative busbar, leak the leakage current that the current detection branch road is used for detecting the branch road, MCU is used for calculating insulation resistance according to detecting busbar voltage and leakage current, generating line and branch road insulation resistance's monitoring has been realized, the utility model discloses on -line monitoring direct current system's insulation against ground situation in real time makes the direct current system can the steady operation.
Description
Technical field
The utility model relates to a kind of intelligent microcomputer direct current system monitoring equipment, belongs to straight-flow system monitoring technical field.
Background technology
Growing along with Power Electronic Technique; and the development trend of straight-flow system; operative practice proves; the harm of DC system grounding not only makes protective relaying device malfunction, tripping; even can cause the primary equipment malfunction of employing DC control, tripping, seriously jeopardize power system safety and stability and run.So, the insulation against ground situation of real time on-line monitoring straight-flow system and Real-Time Monitoring AC compounent must seal in the situation of straight-flow system, occur that ground connection and interchange seal in, direct current is altered mutually, system distributed capacitance is excessive, time will fix a breakdown in time.
Utility model content
The purpose of this utility model is to provide a kind of intelligent microcomputer direct current system monitoring equipment, to realize the monitoring to intelligent microcomputer direct current system busbar and branch insulation resistance.
The utility model provides a kind of intelligent microcomputer direct current system monitoring equipment for solving the problems of the technologies described above, this monitoring equipment comprises electric bridge plate, described electric bridge plate comprises electric bridge and electric bridge control circuit, this electric bridge control circuit comprises MCU and the busbar voltage detection branch that is connected with MCU and leakage current test branch road, described busbar voltage detection branch is for detecting positive bus-bar voltage-to-ground in electric bridge, negative busbar voltage-to-ground and just, voltage between negative busbar, described leakage current test branch road is used for the leakage current of detection branch, the value that described MCU is used for detecting according to busbar voltage detection branch and leakage current test branch road calculates insulation resistance.
Described insulating detection equipment also comprises core board, and this core board is connected with the serial communication interface of MCU in electric bridge plate, for realizing man-machine conversation, communication and warning.
Described electric bridge control circuit adopts ARM+ peripheral circuit to realize, and core board adopts ARM+uCOSII operating system to realize.
Described electric bridge control circuit also comprises interchange and seals in detecting signal unit, direct current and go here and there fault detection unit, electric bridge switching control module and distributed capacitance detecting unit mutually, and described electric bridge switching control module carries out by controlling contactless electronic beam switch the switching realizing electric bridge.
The beneficial effects of the utility model are: straight-flow system monitoring equipment of the present utility model comprises electric bridge plate, electric bridge plate comprises electric bridge and electric bridge control circuit, this electric bridge control circuit comprises MCU and the busbar voltage detection branch that is connected with MCU and leakage current test branch road, busbar voltage detection branch is for detecting positive bus-bar voltage-to-ground in electric bridge, negative busbar voltage-to-ground and just, voltage between negative busbar, leakage current test branch road is used for the leakage current of detection branch, MCU is used for according to detecting that busbar voltage and leakage current calculate insulation resistance, achieve the monitoring of bus and branch insulation resistance, the utility model can the insulation against ground situation of real time on-line monitoring straight-flow system.
Simultaneously monitoring equipment of the present utility model also comprises interchange and seals in detecting signal unit, direct current and go here and there fault detection unit, electric bridge switching control module and distributed capacitance detecting unit mutually, can the situation of Real-Time Monitoring AC compounent string straight-flow system, can fix a breakdown in time when occurring that ground connection and interchange seal in, direct current is altered mutually, system distributed capacitance is excessive, enabling straight-flow system stable operation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model intelligent microcomputer direct current system monitoring equipment;
Fig. 2 is the structured flowchart of electric bridge plate in the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, this monitoring equipment uses ARM9 (S3C2410) chip to be main core board+ARM3 (STM32F107) chip to be the modular design structure of main electric bridge plate to intelligent microcomputer direct current system monitoring equipment of the present utility model.Wherein ARM3 be the electric bridge plate of master chip for realizing all intelligent acquisitions, measurement function, ARM9 be the core board of master chip for realizing the functions such as man-machine conversation, communication, warning, ARM+uCOSII operating system can be adopted to realize.Electric bridge plate as shown in Figure 2, comprise electric bridge and electric bridge control circuit, this electric bridge control circuit comprises MCU (ARM) and the busbar voltage detection branch be connected with MCU and leakage current test branch road, if figure voltage detecting branch road is for detecting positive bus-bar voltage-to-ground in electric bridge, negative busbar voltage-to-ground and just, voltage between negative busbar, leakage current test branch road is used for the leakage current of detection branch, MCU is used for according to detecting that voltage and current calculates insulation resistance, realize the monitoring of bus and branch insulation resistance, MCU adopts ST32F107VC, there are 5 independently serial communication ports its inside, wherein 4 communication ports are used for communicating with leakage current transformer, 1 communicates with core board.
Be provided with bus, branch insulation resistance detection unit in electric bridge plate, exchange and seal in detecting unit, direct current and go here and there fault detection unit, learning bridge switching control module and system distributed capacitance detecting unit mutually.
Wherein the concrete testing process of bus insulation resistance detection unit is as follows: positive and negative busbar voltage U1+, U1-detected when MCU control S1, S3, S4 drop into, control S2, S3, S4 detect positive and negative busbar voltage U2+, U2-when dropping into, as shown in Figure 2, the voltage signal detected is by being transferred to MCU after basis, isolation, lifting and amplification process, MCU is according to ohm law I=f (U, I)=U/I and kirchhoff electric current theorem Σ I=0 can draw two equation a and b, can calculate positive and negative bus resistance to earth Rz and Rf:
f(U1+,(Rz//R5//(R1+R2)))+f(U1-,(Rf//R6//(R4+R3)))＝0a
f(U2+,(Rz//R5//(R1+R2)))+f(U2-,(Rf//R6//(R4+R3)))＝0b
In formula a, b, Rz and Rf is unknown number, and these two formulas of simultaneous can obtain positive and negative bus resistance to earth Rz and Rf, thus realize the detection of bus resistance to earth.
Branch insulation resistance detection specific implementation way: by the above-mentioned switching of S1-S4, the leakage current test of branch road CT goes out Id1 and Id2, draws according to above-mentioned theorem and can calculate branch road positive and negative electrode insulation against ground resistance.
Exchange that to seal in be fault form in a kind of straight-flow system, refer to that positive pole in straight-flow system or negative pole are directly or indirectly connected with the L (live wire) of AC system.This fault can cause the load switch in straight-flow system to burn or misoperation.
Exchange and seal in the specific implementation way of input: the positive and negative bus collected over the ground instantaneous voltage Uz, Uf by DC component U_ and AC compounent U ~ superposition, i.e. Uz=Uz_+U ~ and Uf=Uf_+U ~, wherein AC compounent U ~ calculate through the RMS (real effective calculating) of software.
When " interchange seals in " fault appears in straight-flow system, check out that positive and negative busbar industrial frequency AC over the ground seals in component of voltage, the failure mode that industrial frequency AC seals in occur in straight-flow system and can be divided into following several:
Table 1
Exchange the faulty circuit identification sealed in:
Recognition principle: bus alternating voltage seals in detection+branch road leakage current exclusive method+minimum resistance method.
There is the fault type that direct current alters fault mutually in straight-flow system and can be summarized as following 6 kinds:
Direct current " just, just " alters recognition principle mutually: when this fault produces, the positive bus-bar voltage-to-ground that there will be two straight-flow systems keeps identical for a long time, and as switching S1 ~ S4, the amplitude of the positive bus-bar voltage-to-ground fluctuation that two straight-flow systems " just, just " are altered mutually and phase place keep synchronous;
Direct current " negative, negative " alters recognition principle mutually: when this fault produces, the negative busbar voltage-to-ground that there will be two straight-flow systems keeps identical for a long time, and as switching S1 ~ S4, the amplitude of the negative busbar voltage-to-ground fluctuation that two straight-flow systems " negative, negative " are altered mutually and phase place keep synchronous;
Direct current " positive and negative " alters recognition principle mutually: when this fault produces, the negative busbar voltage-to-ground of the positive bus-bar voltage-to-ground and an other road that there will be a straight-flow system keeps identical for a long time, and as switching S1 ~ S4, the amplitude of the voltage-to-ground fluctuation that two straight-flow systems " positive and negative " are altered mutually and phase place keep synchronous;
Direct current " negative, positive " alters recognition principle mutually: when this fault produces, the positive bus-bar voltage-to-ground of the negative busbar voltage-to-ground and an other road that there will be a straight-flow system keeps identical for a long time, and as switching S1 ~ S4, the amplitude of the voltage-to-ground fluctuation that two straight-flow systems " negative, positive " are altered mutually and phase place keep synchronous;
Direct current " just, just " or " negative, negative " alter recognition principle mutually by coil: when this fault produces, there will be two straight-flow systems just, just or negative, negative busbar voltage-to-ground keep identical difference for a long time, and as switching S1 ~ S4, two straight-flow systems " just, just " or " negative, negative " alter mutually just or the amplitude of negative busbar voltage-to-ground fluctuation and phase place keep identical deviation;
Direct current " positive and negative " or " negative, positive " alter recognition principle mutually by coil: when this fault produces, positive and negative or the negative, positive Bus Voltage that there will be two straight-flow systems keeps identical difference for a long time, and as switching S1 ~ S4, two straight-flow systems " positive and negative " or " negative, positive " alter mutually just or negative busbar voltage-to-ground fluctuation amplitude and phase place keep identical deviation;
Recognition principle: by comparing the measuring voltage value of different system, under normal circumstances, measuring voltage all can exist certain deviation.If the magnitude of voltage that certain period measures is identical, or there is very little deviation, both can start software criterion and identify further.
The special software algorithm that electric bridge switching control module adopts software to control uneven resistor bridge realizes, realized by software control contactless electronic beam switch in the present embodiment, utilize the switching of software control stake resistance to reach and apply simulated failure leakage current to mutual inductor, whether normally carry out detection branch mutual inductor, realize the switching function of learning bridge.
System distributed capacitance detecting unit, the switching sample circuit collection voltage variety du just (bear) on bus of learning bridge is adopted within the 0-t time, to carry out integration then divided by the positive bus-bar voltage-to-ground U after stablizing, the positive arm resistance R dropped into is known, that is: (bearing) bus distributed capacitance over the ground is just being calculated by formula C=Q/U=(∫ di*dt)/U=(∫ du*dt)/(R*U), thus the collection that realization is carried out system distributed capacitance.
This monitoring equipment can realize Intelligent self-diagnosis function: regularly (can set) diagnoses self detection whether can lose efficacy (this is very important to the reliability improving system) automatically.Specific implementation way: utilize one of equipment output the lead-out terminal of the constant current source on a series electrical bridge plate and then with wire, all CT be together in series with one, by software regularly closed this output node to each CT apply one just as leakage current at this moment reexamine each CT and whether meeting give this leakage current value, if the leakage current value that indivedual CT send exists severe deviations both can judge that this CT existed fault.
Claims (4)
1. an intelligent microcomputer direct current system monitoring equipment, it is characterized in that, this monitoring equipment comprises electric bridge plate, described electric bridge plate comprises electric bridge and electric bridge control circuit, this electric bridge control circuit comprises MCU and the busbar voltage detection branch that is connected with MCU and leakage current test branch road, described busbar voltage detection branch is for detecting positive bus-bar voltage-to-ground in electric bridge, negative busbar voltage-to-ground and just, voltage between negative busbar, described leakage current test branch road is used for the leakage current of detection branch, the value that described MCU is used for detecting according to busbar voltage detection branch and leakage current test branch road calculates insulation resistance.
2. intelligent microcomputer direct current system monitoring equipment according to claim 1, it is characterized in that, described insulating detection equipment also comprises core board, and this core board is connected with the serial communication interface of MCU in electric bridge plate, for realizing man-machine conversation, communication and warning.
3. intelligent microcomputer direct current system monitoring equipment according to claim 2, is characterized in that, described electric bridge control circuit adopts ARM+ peripheral circuit to realize, and core board adopts ARM+uCOSII operating system to realize.
4. intelligent microcomputer direct current system monitoring equipment according to claim 3, it is characterized in that, described electric bridge control circuit also comprises interchange and seals in detecting signal unit, direct current and go here and there fault detection unit, electric bridge switching control module and distributed capacitance detecting unit mutually, and described electric bridge switching control module carries out by controlling contactless electronic beam switch the switching realizing electric bridge.
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| CN201520613817.6U CN204882720U (en) | 2015-08-14 | 2015-08-14 | Intelligent computer direct current system monitoring facilities |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249108A (en) * | 2016-08-26 | 2016-12-21 | 国网辽宁省电力有限公司 | The Fault Locating Method of a kind of the AC in the DC system and positioner |
| CN106645963A (en) * | 2016-12-27 | 2017-05-10 | 北京天诚同创电气有限公司 | Insulation resistance detection circuit and insulation resistance detection method |
| CN107677906A (en) * | 2017-09-30 | 2018-02-09 | 江苏方天电力技术有限公司 | A kind of transformer station direct current system failure detector circuit and inspection method |
| CN108398644A (en) * | 2018-01-30 | 2018-08-14 | 南京理工大学 | A kind of power battery of pure electric automobile Insulation Inspection System and method |
| CN108983030A (en) * | 2018-08-29 | 2018-12-11 | 国网辽宁省电力有限公司丹东供电公司 | A kind of fault locator and method of the AC in the DC system based on round cut resistance |
| CN109143114A (en) * | 2018-08-01 | 2019-01-04 | 深圳市泰昂能源科技股份有限公司 | A kind of direct current mutually alters fault detection means and method |
| CN111490530A (en) * | 2019-01-25 | 2020-08-04 | 上海颐坤自动化控制设备有限公司 | Leakage protection self-adaptive low-voltage intelligent comprehensive protection device and method |
| CN111929501A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation resistance value change detection circuit, insulation detection system and method |
| CN113064029A (en) * | 2021-03-17 | 2021-07-02 | 南京传积兴自动化科技有限公司 | High-voltage direct-current insulation monitoring system and monitoring method |
| CN113589040A (en) * | 2021-06-08 | 2021-11-02 | 重庆市公安局 | Operation algorithm of 240V direct current power supply system insulation monitoring device |
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2015
- 2015-08-14 CN CN201520613817.6U patent/CN204882720U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249108B (en) * | 2016-08-26 | 2019-01-22 | 北京丹华昊博电力科技有限公司 | A kind of Fault Locating Method and positioning device of the AC in the DC system |
| CN106249108A (en) * | 2016-08-26 | 2016-12-21 | 国网辽宁省电力有限公司 | The Fault Locating Method of a kind of the AC in the DC system and positioner |
| CN106645963A (en) * | 2016-12-27 | 2017-05-10 | 北京天诚同创电气有限公司 | Insulation resistance detection circuit and insulation resistance detection method |
| CN106645963B (en) * | 2016-12-27 | 2019-06-04 | 北京天诚同创电气有限公司 | Insulating resistor detecting circuit and its detection method |
| CN107677906A (en) * | 2017-09-30 | 2018-02-09 | 江苏方天电力技术有限公司 | A kind of transformer station direct current system failure detector circuit and inspection method |
| CN107677906B (en) * | 2017-09-30 | 2020-06-09 | 江苏方天电力技术有限公司 | Transformer substation direct current system fault detection circuit and detection method |
| CN108398644A (en) * | 2018-01-30 | 2018-08-14 | 南京理工大学 | A kind of power battery of pure electric automobile Insulation Inspection System and method |
| CN109143114A (en) * | 2018-08-01 | 2019-01-04 | 深圳市泰昂能源科技股份有限公司 | A kind of direct current mutually alters fault detection means and method |
| CN108983030A (en) * | 2018-08-29 | 2018-12-11 | 国网辽宁省电力有限公司丹东供电公司 | A kind of fault locator and method of the AC in the DC system based on round cut resistance |
| CN108983030B (en) * | 2018-08-29 | 2022-09-09 | 国网辽宁省电力有限公司丹东供电公司 | Fault positioning device and method for alternating current series connection direct current system based on wheel cutting resistor |
| CN111490530A (en) * | 2019-01-25 | 2020-08-04 | 上海颐坤自动化控制设备有限公司 | Leakage protection self-adaptive low-voltage intelligent comprehensive protection device and method |
| CN111929501A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation resistance value change detection circuit, insulation detection system and method |
| CN111929501B (en) * | 2019-05-13 | 2023-04-25 | 上海海拉电子有限公司 | Insulation resistance change detection circuit, insulation detection system and method |
| CN113064029A (en) * | 2021-03-17 | 2021-07-02 | 南京传积兴自动化科技有限公司 | High-voltage direct-current insulation monitoring system and monitoring method |
| CN113589040A (en) * | 2021-06-08 | 2021-11-02 | 重庆市公安局 | Operation algorithm of 240V direct current power supply system insulation monitoring device |
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