CN205005020U - Photovoltaic power plant leakage detection device - Google Patents
Photovoltaic power plant leakage detection device Download PDFInfo
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- CN205005020U CN205005020U CN201520752605.6U CN201520752605U CN205005020U CN 205005020 U CN205005020 U CN 205005020U CN 201520752605 U CN201520752605 U CN 201520752605U CN 205005020 U CN205005020 U CN 205005020U
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- Prior art keywords
- signal
- signal generator
- photovoltaic plant
- analog
- earth detector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Alarm Systems (AREA)
Abstract
The utility model provides a photovoltaic power plant leakage detection device, includes signal generator, signal receiver, signal collector and LCD, behind signal collector collection photovoltaic system's the associated data, by signal generator carries out signal amplification and post -filter output signal frequency to the associated data, signal receiver receives signal generator outgoing letter breath erupts simultaneously and delivers to LCD shows, descends signals information, warning positive pole or negative pole electric leakage when just showing, bearing the bus insulation value. The utility model discloses a photovoltaic power plant leakage detection device basis signal filtering amplification among the signal generator takes to eliminate behind the different the magnification influence of leakage current according to the signal size that detects, improves detection device's sensitivity and precision, guarantees the accuracy that earth fault judges, reduces the misstatement rate.
Description
Technical field
The utility model relates to electric fault checkout gear field, particularly a kind of photovoltaic plant earth detector.
Background technology
The direct current system more complicated of power plant and transformer station, it needs power supply to power, emergency lighting, control, signal, relaying protection and automatics, ac uninterrupted power supply etc., plays a part very important to the reliability service of power plant and transformer station., if search not in time, just may there is second point ground connection in direct current system generation one point earth.After direct current system generation two points ground fault fault; just ground short circuit can be formed; cause relaying protection, signal, automatics malfunction or tripping; or cause DC insurance to fuse; make protection and automatics, control loop loses power supply; the safety of direct threat primary equipment, thus the reliability of electric power system to direct current system has very high requirement.Direct current system is the storage battery operational system that supplies DC load in parallel with float charger.Under normal circumstances, the positive and negative bus of DC power supply is insulation over the ground, when one point earth occurs in loop, does not affect the operation of direct current system in the ordinary course of things.But when or multipoint earthing occur in loop, both positive and negative polarity short circuit can be caused at 2, switch and false protection or tripping.Earth fault often occurs, poor for running environment, the equipment of long operational time, and the chance broken down is more, and often occurs several earth point simultaneously, searches very difficult.Therefore need, when earth fault occurs, to detect accurately it, realize the quick protection of fault.
Current most earth detector detects sensitive not, easily by the interference of other factors, and limited accuracy.
Utility model content
Based on this, the purpose of this utility model is to provide the high photovoltaic plant earth detector of a kind of accuracy of detection.
A kind of photovoltaic plant earth detector, comprise signal generator, signal receiver, signal picker and liquid crystal display, described signal picker gathers the related data of photovoltaic system, and send to described signal generator, described signal generator carries out signal amplification and filtering, the information that described signal generator sends is received again according to described signal receiver, and information is sent in described liquid crystal display and shows, once the ground connection level of system reaches the trip level of setting, output signal is reported to the police, warning negative or positive electrode earth leakage.
Described signal generator comprises analog to digital conversion circuit and signal amplification circuit filter, and described signal generator is connected with a controller, and described controller controls the state of described signal generator.
Further, also comprise an analog multichannel switch, each path analoging switch of described analog multichannel switch is connected with a road positive/negative input signal, completes the switching of a road input signal.
Further, alarm unit and push-button unit is also comprised.
The voltage of described liquid crystal display display unit positive and negative electrode bus, total voltage and both positive and negative polarity insulation against ground resistance, when both positive and negative polarity busbar voltage and insulation resistance do not meet setting value, control alarm unit by described controller and send alarm signal.
Described keyboard unit and described controller carry out communication by wired or wireless mode, if the positive and negative bus insulation of the direct current system detected declines, send alarm signal by described alarm unit, and remove alarm signal by described keyboard unit.
Leakage current signal detected by photovoltaic plant earth detector of the present utility model is very little, and positive and negative bus voltage signal value is very large, according to the signal amplification circuit filter in described signal generator, the impact of leakage current is eliminated after the signal magnitude detected is taked different multiplication factors, improve sensitivity and the precision of checkout gear, ensure the accuracy that earth fault judges, reduce rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the application drawing of the photovoltaic plant earth detector in the utility model one embodiment.
Fig. 2 is a kind of photovoltaic plant earth detector schematic diagram in the utility model one embodiment.
Fig. 3 is the schematic diagram of the signal generator in Fig. 2.
Fig. 4 is the schematic diagram of the signal receiver in Fig. 2.
Embodiment
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.First-selected embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, the object of these embodiments is provided to be make to disclosure of the present utility model more thoroughly comprehensively.
It should be noted that, when element is called as " being fixedly arranged on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually.The object of the term used in specification of the present utility model herein just in order to describe specific embodiment, is not intended to be restriction the utility model.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Refer to Fig. 1, for the application drawing of the photovoltaic plant earth detector in the utility model one embodiment, the positive and negative end of photovoltaic module 1 is connected with inverter 4 with the second fusible link 3 respectively by the first fusible link 2, by the 3rd fusible link 5, signal is sent afterwards, photovoltaic plant earth detector 6 is placed between photovoltaic module first fusible link 2 and the second fusible link 3, is connected with positive/negative by fuse 7.Described photovoltaic plant earth detector 6 is by the leakage current of positive and negative for direct-detection bus, once the ground connection level of system reaches the trip level of setting, sends the electric leakage of signal warning negative or positive electrode.
Refer to Fig. 2, be a kind of photovoltaic plant earth detector schematic diagram of the present utility model, comprise signal generator 12, signal receiver 13 signal picker 11 and liquid crystal display 14.
Described signal generator 12 comprises analog to digital conversion circuit 121 and signal amplification circuit filter 122.Analog-digital conversion circuit as described 121 is converted to digital signal for the analog signal collected by described signal picker 11.
Further, also comprise an analog multichannel switch 111, each path analoging switch of described analog multichannel switch 111 is connected with a road positive/negative input signal, complete the switching of a road input signal, in a particular embodiment, when positive pole leaks electricity, the path analoging switch connecting positive pole closes, other analog switch will be in off-state, and this road input signal be strobed outputs to the output of described analog multichannel switch 111; When negative pole leaks electricity, the path analoging switch connecting negative pole closes, and other analog switches will be in off-state, and this road input signal be strobed outputs to the output of described analog multichannel switch 111
Further, described signal generator 12 is connected with a controller 16, and described controller 16 controls the state of described signal generator 12.
Further, described controller 16 is connected with an alarm unit 17 and a push-button unit 18.
Described keyboard unit 18 carries out communication by display interface and described controller 14 by wired or wireless mode, the voltage of described liquid crystal display 14 display unit positive and negative electrode bus, total voltage and both positive and negative polarity insulation against ground resistance, when both positive and negative polarity busbar voltage and insulation resistance do not meet setting value, control described alarm unit 17 by described controller 14 and send alarm signal, under keeper gets the information, remove alarm signal by described keyboard unit 18.
Refer to Fig. 3, for the schematic diagram of the signal generator 12 of the utility model embodiment, analog signal is converted to digital signal through analog-digital conversion circuit as described 121 by the analog signal of signals collecting, be sent to after signal is analyzed in described liquid crystal display 14 and show data message, again data message is fed back to controller 16, then by the operational mode of described controller 16 control device.
Refer to Fig. 4, for the schematic diagram of the signal receiver of the utility model embodiment, signals collecting to signal carry out signal amplification and filtering by described signal amplification circuit filter 122, through analog-digital conversion circuit as described 121, analog signal is converted to digital signal, by showing data message to being sent to after signal transacting and accident analysis in described liquid crystal display 14.
Leakage current signal detected by photovoltaic plant earth detector of the present utility model is very little, and positive and negative bus voltage signal value is very large, according to the signal amplification circuit filter in described signal generator and power amplification circuit, the impact of leakage current is eliminated after taking different multiplication factors according to detected signal magnitude, improve sensitivity and the precision of checkout gear, ensure the accuracy that earth fault judges, reduce rate of false alarm.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (6)
1. a photovoltaic plant earth detector, comprise signal generator, signal receiver, signal picker and liquid crystal display, it is characterized in that, after described signal picker gathers the related data of photovoltaic system, by described signal generator, output signal frequency after signal amplification and filtering is carried out to related data, described signal receiver receives information that described signal generator sends and is sent to described liquid crystal display and shows, when the positive and negative bus insulation value of display declines, send signal message, the electric leakage of warning negative or positive electrode.
2. photovoltaic plant earth detector according to claim 1, it is characterized in that, described signal generator comprises analog to digital conversion circuit and signal amplification circuit filter, and the analog-signal transitions that analog-digital conversion circuit as described is used for described signal picker to collect is digital signal.
3. photovoltaic plant earth detector according to claim 1, is characterized in that, also comprises an analog multichannel switch, and each path analoging switch of described analog multichannel switch is connected with a road positive/negative input signal, completes the switching of a road input signal.
4. photovoltaic plant earth detector according to claim 1, is characterized in that, also comprises a controller, and described signal generator is connected with described controller, and described controller controls the running status of described signal generator.
5. photovoltaic plant earth detector according to claim 4, is characterized in that, also comprises an alarm unit, and described alarm unit is connected with described controller, and described controller controls described alarm unit and sends alarm signal.
6. photovoltaic plant earth detector according to claim 5, it is characterized in that, also comprise a push-button unit, described push-button unit transmits relevant information by display interface and described controller by communication modes, and described push-button unit controls the closed condition of described alarm unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520752605.6U CN205005020U (en) | 2015-09-25 | 2015-09-25 | Photovoltaic power plant leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520752605.6U CN205005020U (en) | 2015-09-25 | 2015-09-25 | Photovoltaic power plant leakage detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205005020U true CN205005020U (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520752605.6U Expired - Fee Related CN205005020U (en) | 2015-09-25 | 2015-09-25 | Photovoltaic power plant leakage detection device |
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| Country | Link |
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| CN (1) | CN205005020U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342805A (en) * | 2018-11-21 | 2019-02-15 | 陕西电器研究所 | A kind of high-precision micro-ampere current detection circuit |
| WO2023284230A1 (en) * | 2021-07-14 | 2023-01-19 | 科华数据股份有限公司 | Multi-channel photovoltaic module ground fault detection device and detection method |
-
2015
- 2015-09-25 CN CN201520752605.6U patent/CN205005020U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342805A (en) * | 2018-11-21 | 2019-02-15 | 陕西电器研究所 | A kind of high-precision micro-ampere current detection circuit |
| CN109342805B (en) * | 2018-11-21 | 2020-12-22 | 陕西电器研究所 | High-precision microampere current detection circuit |
| WO2023284230A1 (en) * | 2021-07-14 | 2023-01-19 | 科华数据股份有限公司 | Multi-channel photovoltaic module ground fault detection device and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160127 Termination date: 20170925 |
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| CF01 | Termination of patent right due to non-payment of annual fee |