CN201540347U - DC earth fault detector - Google Patents
DC earth fault detector Download PDFInfo
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- CN201540347U CN201540347U CN2009202479744U CN200920247974U CN201540347U CN 201540347 U CN201540347 U CN 201540347U CN 2009202479744 U CN2009202479744 U CN 2009202479744U CN 200920247974 U CN200920247974 U CN 200920247974U CN 201540347 U CN201540347 U CN 201540347U
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- analog
- digital conversion
- detection device
- ground fault
- fault detection
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Abstract
The utility model belongs to the technical field of a DC earth fault detector, and particular to a DC earth fault detector based on LabVIEW software and wavelet transformation, which comprises a hardware part and a software part. The hardware part comprises an industrial personal computer, a detector and a DC power supply network. The industrial personal computer is provided with a PCI acquisition card, an output analog/digital conversion channel and an input analog/digital conversion channel. The detector comprises the following components: a multipath analog quantity acquisition card connected with the output analog/digital conversion channel, a signal conditioning converter, an unbalanced bridge, a loading circuit connected with the DC power supply network, and a low-frequency signal source generator; the low-frequency signal source generator is connected with the input analog/digital conversion channel; and the software part is provided in the industrial personal computer. As the LabVIEW software is combined with the digital signal processing techniques such as advanced wavelet transformation, the DC earth fault detector has the following advantages: higher convenience, strong interference resistance, good real-time performance and high precision.
Description
Technical field
The utility model belongs to DC ground fault detection technique field, especially a kind of DC ground fault detection device.
Background technology
The straight-flow system of generating plant and transformer station provides power supply for various monitoring and protection equipment and operation circuit, and the quality of its operation conditions is directly connected to the generating plant and can transformer station normally move.Branch road ground connection is the modal fault of straight-flow system, as if can not in time finding and getting rid of it, when multipoint earthing occurring in system, will cause direct supply short circuit or protection equipment malfunction to do, and leads to grave consequences.
DC system earth fault is the problem that can not be ignored in the electric system always.At present, most ground fault detection device is to be based upon on the basis of single-chip microcomputer to realize, but the single-chip microcomputer Limited resources is difficult to finish some as the detection algorithm based on the advanced person of wavelet transformation in these devices.
The granted patent close with the utility model is " DC System Grounding Fault Detecting Device and detection method thereof " (application number: 200510014058).Apply for a patent 200510014058 a kind of DC System Grounding Fault Detecting Device and method are provided.Its device comprises microprocessor and a plurality of current transformer.Microprocessor is connected with low frequency signal source, detects electric bridge, display alarm and sampling hold circuit.The input end of its synchronism link is connected with the positive and negative busbar of straight-flow system, and the output terminal of synchronism link is connected with the input end of described multi-way switch by isolation link.Its method comprises: the insulation status of monitoring straight-flow system by two asymmetric electric bridges, when monitoring earth fault, judge polarity of ground, and send information to start low frequency signal source to microprocessor, inject stable sine or cosine low-frequency voltage signal to straight-flow system, handle when the current transformer electric current carries out characteristic of loop branches during greater than 1A, otherwise carry out step such as general branch road processing.The shortcoming of this scheme is that the speed of data transmission is slower, and the reliability of system is lower.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, for the straight-flow system of generating plant and transformer station provides the DC ground fault detection device based on LabVIEW software and wavelet transformation that a kind of antijamming capability is strong, real-time good, precision is high.
The purpose of this utility model realizes by following technical proposals:
According to DC ground fault detection device of the present utility model, it is characterized in that comprising hardware components and software section, hardware components comprises Industrial Control Computer, the pick-up unit that is connected of Industrial Control Computer therewith, the dc suppling network that is connected of pick-up unit therewith, be provided with a PCI capture card in the described Industrial Control Computer, output analog to digital conversion passage, input analog to digital conversion passage, be provided with the multi-analog capture card that is connected with described output analog to digital conversion passage in the described pick-up unit, the signal condition conversion equipment that is connected of multi-analog capture card therewith, the unbalanced bridge that is connected of signal condition conversion equipment therewith, the loaded circuit that is connected with described dc suppling network, the low frequency signal source generator that is connected of loaded circuit therewith, this low frequency signal source generator is connected with described input analog to digital conversion passage, and described software section is arranged in the described Industrial Control Computer.
LabVIEW is the abbreviation of Laboratory Virtual Instrument Engineering.Be a graphical development software of NI company.Utilize the development environment of LabVIEW, use development environment with the wavelet transformation function branch current signal that collects is handled.
Described unbalanced bridge is connected with the monitoring device that a direct current network positive and negative busbar insulating resistance to earth changes.What monitoring part in real time adopted is two asymmetric electric bridges.
Be provided with a second-order low-pass filter circuit in the described signal condition conversion equipment.
Described low frequency signal source generator adopts the Direct Digital frequency synthesized signal generator.
Be provided with power amplification circuit in the described loaded circuit, the control transformer that this power amplification circuit is selected for use is elementary to be input as～380V/220V, the secondary 36/24/12/6V that is output as.General～5V low-frequency voltage signal Access Control transformer secondary output 36V connection terminal is drawn through the low-frequency voltage signal after boosting from elementary～220V terminal, and the electric capacity that is 8 μ F/400V by two capacity injects the straight-flow system positive and negative busbar respectively.
Described PCI capture card is a pci bus, is the multiplexing local bus of a kind of high-performance 32/64 bit address data line, and this pci bus adopts the data-transmission mode of linear burst.
This device comes earth fault is handled by adopting the data analysis based on wavelet transformation, and the low-frequency voltage that utilization collects and the current value of each branch road calculate the resistance value on each road, thereby find out fault branch.
Compare with prior art, this device is by adopting LabVIEW and carrying out the design of dc system fault pick-up unit in conjunction with the PCI capture card, quickened the speed of data transmission, can fully use software and hardware resource abundant on the PC platform, tasks such as data processing, the target of finishing a large amount of complexity shows, parameter is provided with, overcome the shortcoming of the pick-up unit existence of in the past adopting the single-chip microcomputer design, the reliability of system is greatly improved.
The beneficial effect of this device is:
The design that this device adopts based on the failure detector of the DC distribution net of LabVIEW, a significant advantage is exactly to utilize powerful graphic programming ability of LabVIEW software and flexile data processing function, in conjunction with advanced Digital Signal Processings such as wavelet transformation, detection, control and warning interface by writing direct current network make failure detector more convenient to operate for the user.
Description of drawings
Fig. 1 is a hardware block diagram of the present utility model.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
As shown in Figure 1, according to DC ground fault detection device of the present utility model, it is characterized in that comprising hardware components and software section, hardware components comprises Industrial Control Computer, the pick-up unit that is connected of Industrial Control Computer therewith, the dc suppling network that is connected of pick-up unit therewith, be provided with a PCI capture card in the described Industrial Control Computer, output analog to digital conversion passage, input analog to digital conversion passage, be provided with the multi-analog capture card that is connected with described output analog to digital conversion passage in the described pick-up unit, the signal condition conversion equipment that is connected of multi-analog capture card therewith, the unbalanced bridge that is connected of signal condition conversion equipment therewith, the loaded circuit that is connected with described dc suppling network, the low frequency signal source generator that is connected of loaded circuit therewith, this low frequency signal source generator is connected with described input analog to digital conversion passage, and described software section is arranged in the described Industrial Control Computer.
Described unbalanced bridge is connected with the monitoring device that a direct current network positive and negative busbar insulating resistance to earth changes.What monitoring part in real time adopted is two asymmetric electric bridges.
Be provided with a second-order low-pass filter circuit in the described signal condition conversion equipment.
Described low frequency signal source generator adopts the Direct Digital frequency synthesized signal generator.
Be provided with power amplification circuit in the described loaded circuit, the control transformer that this power amplification circuit is selected for use is elementary to be input as～380V/220V, the secondary 36/24/12/6V that is output as.General～5V low-frequency voltage signal Access Control transformer secondary output 36V connection terminal is drawn through the low-frequency voltage signal after boosting from elementary～220V terminal, and the electric capacity that is 8 μ F/400V by two capacity injects the straight-flow system positive and negative busbar respectively.
Described PCI capture card is a pci bus, is the multiplexing local bus of a kind of high-performance 32/64 bit address data line, and this pci bus adopts the data-transmission mode of linear burst.
Compare with prior art, this device is by adopting LabVIEW and carrying out the design of dc system fault checkout gear in conjunction with the PCI capture card, accelerated the speed of transfer of data, can fully use software and hardware resource abundant on the PC platform, the tasks such as the data of finishing a large amount of complexity are processed, target shows, parameter arranges, overcome the shortcoming of the checkout gear existence of in the past adopting the single-chip microcomputer design, the reliability of system is greatly improved.
The beneficial effect of this device is:
The design based on the failure detector of the DC distribution net of LabVIEW that this device adopts, a significant advantage is exactly to utilize the powerful graphic programming ability of LabVIEW software and flexile data processing function, in conjunction with the advanced Digital Signal Processings such as wavelet transformation, by detection, control and the warning interface of writing direct current network, so that failure detector is more convenient to operate for the user.
Claims (6)
1. DC ground fault detection device, it is characterized in that comprising hardware components and software section, hardware components comprises Industrial Control Computer, the pick-up unit that is connected of Industrial Control Computer therewith, the dc suppling network that is connected of pick-up unit therewith, be provided with a PCI capture card in the described Industrial Control Computer, output analog to digital conversion passage, input analog to digital conversion passage, be provided with the multi-analog capture card that is connected with described output analog to digital conversion passage in the described pick-up unit, the signal condition conversion equipment that is connected of multi-analog capture card therewith, the unbalanced bridge that is connected of signal condition conversion equipment therewith, the loaded circuit that is connected with described dc suppling network, the low frequency signal source generator that is connected of loaded circuit therewith, this low frequency signal source generator is connected with described input analog to digital conversion passage, and described software section is arranged in the described Industrial Control Computer.
2. DC ground fault detection device according to claim 1 is characterized in that described unbalanced bridge is connected with the monitoring device that a direct current network positive and negative busbar insulating resistance to earth changes, and what monitoring part in real time adopted is two asymmetric electric bridges.
3. DC ground fault detection device according to claim 1 is characterized in that being provided with in the described signal condition conversion equipment second-order low-pass filter circuit.
4. DC ground fault detection device according to claim 1 is characterized in that described low frequency signal source generator adopts the Direct Digital frequency synthesized signal generator.
5. DC ground fault detection device according to claim 1, it is characterized in that being provided with power amplification circuit in the described loaded circuit, the control transformer that this power amplification circuit is selected for use is elementary to be input as～380V/220V, the secondary 36/24/12/6V that is output as, general～5V low-frequency voltage signal Access Control transformer secondary output 36V connection terminal, draw through the low-frequency voltage signal after boosting from elementary～220V terminal, the electric capacity that is 8 μ F/400V by two capacity injects the straight-flow system positive and negative busbar respectively.
6. DC ground fault detection device according to claim 1 is characterized in that described PCI capture card is a pci bus, is the multiplexing local bus of a kind of high-performance 32/64 bit address data line, and this pci bus adopts the data-transmission mode of linear burst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202479744U CN201540347U (en) | 2009-11-11 | 2009-11-11 | DC earth fault detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202479744U CN201540347U (en) | 2009-11-11 | 2009-11-11 | DC earth fault detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201540347U true CN201540347U (en) | 2010-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202479744U Expired - Fee Related CN201540347U (en) | 2009-11-11 | 2009-11-11 | DC earth fault detector |
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| Country | Link |
|---|---|
| CN (1) | CN201540347U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI610082B (en) * | 2016-07-07 | 2018-01-01 | 台達電子工業股份有限公司 | Power converting device and ground impedance value detecting method |
-
2009
- 2009-11-11 CN CN2009202479744U patent/CN201540347U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI610082B (en) * | 2016-07-07 | 2018-01-01 | 台達電子工業股份有限公司 | Power converting device and ground impedance value detecting 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20171111 |