CN105242168A - Split type leakage current acquisition system - Google Patents
Split type leakage current acquisition system Download PDFInfo
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- CN105242168A CN105242168A CN201510724224.1A CN201510724224A CN105242168A CN 105242168 A CN105242168 A CN 105242168A CN 201510724224 A CN201510724224 A CN 201510724224A CN 105242168 A CN105242168 A CN 105242168A
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Abstract
The invention belongs to the technical field of power line electric leakage detection, and discloses a split type leakage current acquisition system, for automatically detecting leakage currents at a user side and transmitting the currents to a work station after onsite data processing. The system comprises a measuring module, a signal acquisition and conditioning module, a reference power supply module, a power supply module, a communication module, a liquid crystal display and keyboard module, a cock module, a data storage module and a high-speed microprocessor module, wherein each module employs a standard interface and are coupled by use of a loose coupling mode. According to the invention, manual acquisition is unnecessary, the leakage currents at the user side can be monitored automatically in real time, leakage points can be rapidly sought, and the power supply reliability and safety are improved.
Description
technical field:
The present invention relates to a kind of split type leakage current acquisition system, belong to power line leakage detection technique field.
background technology:
Earth leakage protective device being called " protector " by image; usually be arranged on power circuit; when electric leakage occurs power circuit and the electric current revealed reaches certain numerical value, it by dump in human electric shock's 0.1 second, thus can avoid the electric shock time long human injury caused.But buying at one's own expense because this device belongs to user, therefore there is great potential safety hazard in not solar obligation requirement.
Consider Electrical Safety and device security, power department is equipped with total earth leakage protective device at platform district leading-out terminal usually, and general threshold value is set to 200 milliamperes.If the problem such as power consumer mode of connection mistake or aging circuit of generation, usually cause tripping operation, cause whole piece line outage, need to investigate one by one all users to the maintenance of fault, workload is large and waste time and energy.
Traditional leakage current measurement to be worked at a selected spot collection by staff scene, conventional sampling instrument is current pincerlike meter, this acquisition method can only find continual leakage current, carelessness is usually easy to for intermittent residual current stream, transformer terminal and user side monitoring are difficult to ensure simultaneity, like this uncertain factor are brought for the analysis of leakage current and the location of rain supply.
summary of the invention:
In view of the deficiency that above prior art exists, the invention provides the split type leakage current acquisition system that a kind of each module can freely be replaced, test macro can be directly installed on user's slotted line terminal as resident devices, change traditional observation measurement into automatic sampling analysis, and realize the integrated of data and remote transmission, be good at the detection of period, sporadic user side drain conditions.
For achieving the above object, the technical solution adopted in the present invention is:
Split type leakage current acquisition system, comprises measurement module, signals collecting and conditioning module, communication module, data memory module and high speed microprocessor module, wherein:
Measurement module is used for the measurement of leakage current in circuit;
Signals collecting and conditioning module are used for carrying out collection to measurement data and go forward side by side digitized process;
Data memory module is electrically connected with high speed microprocessor module and realizes transmitted in both directions, for the data message that storage signal collection and conditioning module collect, and the communication information that communication module produces;
Communication module is electrically connected with high speed microprocessor module and realizes transmitted in both directions, for the data message be stored in data memory module is sent to workstation, and carry out real-time communication with workstation, obtain the instruction of workstation or report Real-time Collection situation to workstation;
Wherein, communication module, data memory module all use standard interface and adopt loose coupling mode to connect between module.
Following optimal design-aside can also be carried out in the basis of technique scheme:
Be punched-type or pincerlike formula for measuring the leakage current sensor of leakage current in measurement module.It is high that punched-type has measuring accuracy, and anti-electromagnetic interference capability is strong, the distinguishing features such as power supply accommodation is wide; Pincerlike formula is measured easy for installation, measures simple, can optional one as required.
Measurement module is provided with can the external interface of external measurement equipment, supports serial ports and cable port acquisition interface, facilitates staff's handheld device scene to read data.
Signals collecting and the embedded linux system of conditioning module, adopt Arm9 process chip, adopts digital signal processing method to process the data collected, adopt fast Fourier algorithm, and data processing speed is faster, guarantees that the leakage data of moment is not lost.
Communication module built-in motive objects networking card module, by the data upload of detecting to Internet of Things high in the clouds, can provide data, services.
Communication module is provided with wireline interface, and wireline interface supports serial ports, port and USB, when supporting simple network agreement pair, supports that asynchronous serial port is no less than 4, supports 2 Ethernet interfaces.
Communication module is provided with wave point, adopts China Mobile network, supports 4G.
Perfect further, split type leakage current acquisition system also comprises reference power supply module, liquid crystal display and Keysheet module, power module and clock module.
Clock module, liquid crystal display and Keysheet module all use standard interface, adopt loose coupling mode to connect between two modules.
Split type leakage current acquisition system provided by the present invention, can carry out Real-Time Monitoring to the leakage current of circuit in user family, Timeliness coverage potential safety hazard is got rid of in time, thus improves power supply reliability and security.By detecting the leakage current of user side; fast finding can be carried out to causing the reason of total leakage current protector action; thus improve the operational percentage of total leakage current protector; and adopt loose coupling to connect between each module of system; when prior art improves, each module can freely be replaced; accomplishing to obtain maximum value by minimum cost, is the solution from the measurement of data, collection, storage, communicating integral.
Below by way of the drawings and specific embodiments, the present invention is further elaborated.
accompanying drawing illustrates:
Fig. 1 is present system connection side block diagram;
Fig. 2 is that the present invention measures installation site schematic diagram in the user side TT mode of connection;
Fig. 3 is that the present invention measures installation site schematic diagram in the user side TN-S mode of connection;
Fig. 4 is that the present invention measures installation site schematic diagram in total line;
Fig. 5 is that the present invention measures installation site schematic diagram at branched line.
Label declaration:
Signals collecting and conditioning module 1, reference power supply module 2, power module 3, communication module 4, liquid crystal display and Keysheet module 5, clock module 6, data memory module 7, high speed microprocessor module 8, wireline interface 9, wave point 10, split type leakage current acquisition system 11, measurement module 12.
embodiment:
As shown in Figure 1, split type leakage current acquisition system 11 disclosed in this invention, comprises measurement module 12, signals collecting and conditioning module 1, reference power supply module 2, power module 3, communication module 4, liquid crystal display and Keysheet module 5, clock module 6, data memory module 7 and high speed microprocessor module 8.
Wherein, measurement module 12 for the leakage current in measuring circuit, by measurement module 12 for measuring the leakage current sensor of electric leakage around being arranged on tested power circuit, metering system can adopt punched-type also can adopt pincerlike formula.Need that measuring accuracy is higher just selects punched-type, want simple and more easy for installationly just select pincerlike formula.Utilize electromagnetic induction principle, when the situation that insulate in circuit is normal, the size of current flowing through leakage current sensor is equal, and direction is contrary, and its output signal is zero; When electric leakage appears in circuit, the balance of electric current is destroyed, and the output of leakage current sensor is non-vanishing.By detecting the output signal of each leakage current sensor, the drain conditions of each circuit can be judged.
Obtain measurement data for ease of staff scene, measurement module 12 is also provided with can the external interface of external measurement equipment, supports serial ports and cable port acquisition interface, staff's hand-holdable device context quick obtaining measurement data.
Signals collecting and conditioning module 1 are electrically connected with reference voltage module 2, and reference power supply module 2 provides reference voltage for signals collecting and conditioning module 1.Signals collecting and conditioning module 1 to be gone forward side by side digitized process for carrying out collection to measurement data, and the embedded linux system of this module, adopts Arm9 process chip, adopts multithreading acquisition technique and DSP treatment technology.Cycle sample 32 times and more than, with fast Fourier algorithm, calculate first-harmonic and 1 ~ 15 subharmonic; Calculated the effective value of leakage current by first-harmonic and 1 ~ 15 subharmonic again, guarantee that the leakage current of moment is not lost.
Power module 3 one end connects test line, and one end connects high speed microprocessor module 8 to system power supply.Direct employing test line 220V Alternating Current Power Supply, the power that consumes of split type leakage current acquisition system 11 exchanges and is not more than 15VA at rated loads, solves working site and gets a difficulty, can not the shortcoming of long-term work.
Data memory module 7 is electrically connected with high speed microprocessor module 8 and realizes transmitted in both directions, for the data message that storage signal collection and conditioning module 1 collect, and the communication information that communication module 4 produces.Data memory module 7 can the Coutinuous store image data of 30 days, automatically covers numerical value last time for the data exceeding the maximum storage cycle.
Communication module 4 is electrically connected with high speed microprocessor module 8 and realizes transmitted in both directions, and communication module 4 is provided with wireline interface 9 and/or wave point 10.Wireline interface 9 supports serial ports, port and USB, wire communication Refresh Data≤10 second, when supporting SNTP couple, support that asynchronous serial port is no less than 4, speed reaches as high as 115.2Kbps, supports 2 Ethernet interfaces (Shielded Twisted Pair), communication distance 100m single hop, extend by suitable means, traffic rate 10/100Mbps.Wave point 10 built-in motive objects networking card module, adopts China Mobile network, supports 4G, by data upload to Internet of Things high in the clouds, and can carry out real-time communication with workstation, obtains the instruction of workstation or reports Real-time Collection situation to workstation.
Clock module 6 is all electrically connected with high speed microprocessor module 8 with liquid crystal display and Keysheet module 5 and realizes transmitted in both directions, wherein, clock module 6 sends the clock signal of generation to high speed microprocessor module 8, and by the LCD MODULE in liquid crystal display and Keysheet module 5, calendar clock is shown, the Keysheet module in liquid crystal display and Keysheet module 5 is arranged by the calendar clock of high speed microprocessor module 8 pairs of clock modules 6.
Communication module 4 uses RS-485 interface, and data memory module 7 uses SPI interface, and clock module 6 uses IIC interface, and liquid crystal display and Keysheet module 5 use SPI interface, adopts loose coupling mode to connect between above each module.
When split type leakage current acquisition system 11 uses, installation site need be determined according to the difference of the power circuit mode of connection, and specific requirement is as follows:
Wherein, in Fig. 2 ~ Fig. 5, L1, L2, L3 represent the live wire of three different circuits, and N represents the neutral line, and PE represents ground wire.
For the TT mode of connection, as shown in Figure 2, its wiring feature is: power transformer neutral ground in split type leakage current acquisition system 11 installation site; Electrical appliance enclosure adopts protective ground, is namely connected to one independently on ground-electrode; Be used in the larger village of single, the three-phase mixing electricity consumption that the neutral line exports.Measuring method is: three phase electric equipment access triple-phase line and the neutral line; Single-phase electric devices access phase line and the neutral line.
For the TN-S mode of connection, as shown in Figure 3, its wiring feature is: low-tension transformer neutral point is directly connected with earthing pole in split type leakage current acquisition system 11 installation site; The exposed conductive part of device all uses PE line to be connected on same ground-electrode; PE is separated with neutral line N.Measuring method is: three phase electric equipment access triple-phase line and the neutral line; Single-phase electric devices access phase line and the neutral line.
Measure for total line, as shown in Figure 4, its measuring method is in split type leakage current acquisition system 11 installation site: access split type leakage current acquisition system 11 at exchanging electricity transformer leading-out terminal.
Measure for branched line, as shown in Figure 5, its measuring method is in split type leakage current acquisition system 11 installation site: in the split type leakage current acquisition system 11 of the place of picking out of branched line access.
The smallest particles degree that split type leakage current acquisition system of the present invention is applicable to is single power consumer, and user's service conductor carries out leakage current measurement, and the value that single-phase user measures is reliable and effective value.And in three-phase line every mutually under all may produce leakage current, it is the vector of each phase leakage current when measuring the leakage current of three-phase line, there is the angle of 120 degree in three electric currents, therefore the leakage current value measured is far below actual value, therefore the leakage current measuring three-phase line is nonsensical, only have when measuring a concrete phase circuit and be just of practical significance, route survey value can be used as the basis for estimation reducing location leakage, therefore, the value that three-phase user measures is vector value, accurately can not reflect drain conditions, if the value measured is greater than zero explanation three-phase user and certainly there is leakage current, if three-phase leaks electricity simultaneously, and leakage current homogeneous phase etc. under extreme case vector be zero.So the measuring object of this scheme the best is single-phase user.
Split type leakage current acquisition system 11 provided by the present invention is better than traditional on-site measurement method." will work at a selected spot " to measure and change sampling analysis into, reduce the input of human cost; Adopt punched-type and the configuration of pincers line formula mechanical flexibility, the Alternating Current Power Supply of 220V can ensure that equipment is powered for a long time; Dynamical DSP treatment technology, accurately locates leakage current unit in real time, and wireless communication technology solves data interconnection; Appearance design simplicity generosity, simple to operate, be easy to carry and installation, be applicable to secondary network, especially rural power line location electric leakage unit provides a kind of economic solution reliably.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in right of the present invention.
Claims (10)
1. split type leakage current acquisition system, is characterized in that: comprise measurement module, signals collecting and conditioning module, communication module, data memory module and high speed microprocessor module, wherein:
Described measurement module is used for the measurement of leakage current in circuit;
Described signals collecting and conditioning module are used for carrying out collection to measurement data and go forward side by side digitized process, and send the data message after process to described high speed microprocessor module;
Described data memory module is electrically connected with described high speed microprocessor module and realizes transmitted in both directions, for storing the data message that described signals collecting and conditioning module collect, and the communication information that described communication module produces;
Described communication module is electrically connected with described high speed microprocessor module and realizes transmitted in both directions, for the data message be stored in described data memory module is sent to workstation, and carry out real-time communication with workstation, obtain the instruction of workstation or report Real-time Collection situation to workstation;
Described communication module, data memory module all use standard interface and adopt loose coupling mode to connect between module.
2. split type leakage current acquisition system according to claim 1, is characterized in that: be punched-type or pincerlike formula for measuring the leakage current sensor of leakage current in described measurement module.
3. split type leakage current acquisition system according to claim 1, is characterized in that: described measurement module is provided with can the external interface of external measurement equipment.
4. the split type leakage current acquisition system according to claim 1 or 2 or 3, is characterized in that: described signals collecting and the embedded linux system of conditioning module, adopts Arm9 process chip, adopts digital signal processing method to process the data collected.
5. split type leakage current acquisition system according to claim 4, is characterized in that: described communication module built-in motive objects networking card module.
6. split type leakage current acquisition system according to claim 1, is characterized in that:
Described communication module is provided with wireline interface, and described wireline interface supports serial ports, port and USB, when supporting SNTP pair, supports that asynchronous serial port is no less than 4, supports 2 Ethernet interfaces.
7. split type leakage current acquisition system according to claim 5, is characterized in that:
Described communication module is provided with wave point.
8. split type leakage current acquisition system according to claim 5, is characterized in that:
Described split type leakage current acquisition system also comprises reference power supply module, liquid crystal display and Keysheet module, power module and clock module.
9. split type leakage current acquisition system according to claim 4, is characterized in that:
Described signals collecting and conditioning module adopt fast Fourier algorithm.
10. split type leakage current acquisition system according to claim 8, is characterized in that: described clock module, liquid crystal display and Keysheet module all use standard interface, adopts loose coupling mode to connect between two modules.
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| CN201510724224.1A CN105242168A (en) | 2015-10-29 | 2015-10-29 | Split type leakage current acquisition system |
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| CN201510724224.1A CN105242168A (en) | 2015-10-29 | 2015-10-29 | Split type leakage current acquisition system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105738763A (en) * | 2016-02-16 | 2016-07-06 | 国家电网公司 | Low-voltage TT wiring system transformer area electric leakage point positioning method and special-purpose detection tool |
| CN107976603A (en) * | 2017-11-21 | 2018-05-01 | 国网山东省电力公司淄博供电公司 | Portable concentrated gas meter box earth detector |
| CN108226701A (en) * | 2018-02-17 | 2018-06-29 | 曾世容 | A kind of intermittent electric leakage centralized monitoring system and method based on power line carrier, PLC |
| CN113325227A (en) * | 2021-05-31 | 2021-08-31 | 广东电网有限责任公司 | One-point grounding current acquisition method and device based on power line carrier communication |
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| DE19723130A1 (en) * | 1997-06-03 | 1999-01-07 | Condor Werk Frede Kg Geb | Leakage current display arrangement for electrical conductors in house |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738763A (en) * | 2016-02-16 | 2016-07-06 | 国家电网公司 | Low-voltage TT wiring system transformer area electric leakage point positioning method and special-purpose detection tool |
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| CN107976603A (en) * | 2017-11-21 | 2018-05-01 | 国网山东省电力公司淄博供电公司 | Portable concentrated gas meter box earth detector |
| CN108226701A (en) * | 2018-02-17 | 2018-06-29 | 曾世容 | A kind of intermittent electric leakage centralized monitoring system and method based on power line carrier, PLC |
| CN113325227A (en) * | 2021-05-31 | 2021-08-31 | 广东电网有限责任公司 | One-point grounding current acquisition method and device based on power line carrier communication |
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Application publication date: 20160113 |