CN103926502B - A kind of alternating current-direct current of dc source alters electric detection means - Google Patents
A kind of alternating current-direct current of dc source alters electric detection means Download PDFInfo
- Publication number
- CN103926502B CN103926502B CN201410167101.8A CN201410167101A CN103926502B CN 103926502 B CN103926502 B CN 103926502B CN 201410167101 A CN201410167101 A CN 201410167101A CN 103926502 B CN103926502 B CN 103926502B
- Authority
- CN
- China
- Prior art keywords
- source
- signal
- direct current
- input
- fpga
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
Electric detection means is altered the invention provides a kind of alternating current-direct current of dc source, including blocking wave filter, divider, RMS conversion device, A/D samplers, FPGA and audible-visual annunciator, after blocking wave filter is filtered to dc bus, AC signal is exported to divider, exported after voltage divider to RMS conversion device, exported to A/D samplers after the conversion of RMS conversion device, exported after A/D sampler samples to FPGA, audible-visual annunciator is connected with FPGA again.Whether this detection means quickly can detect to there is alternating current-direct current to alter electricity in DC power supply circuit.
Description
Technical field
Electric detection means is altered the present invention relates to a kind of alternating current-direct current, especially a kind of alternating current-direct current for dc source alters electric-examination
Survey device.
Background technology
DC system earth fault in power system is a kind of easy generation and the failure larger to power system harmfulness.
Either plus earth or negative pole are grounded, and in the case of two points ground fault, are all likely to result in false protection or relay fail,
Harm primary system normally runs.Patrol mode being used existing direct current monitoring device, completing one-time detection needs the time long more,
Efficiency comparison is low, and existing direct current on-Line Monitor Device is only monitored to insulation, and the exchange in straight-flow system is altered
Electric fault is mutually altered failure with direct current and cannot but be monitored.
The content of the invention
Quickly can be carried out to whether there is alternating current-direct current to alter electricity in DC power supply circuit it is an object of the invention to provide one kind
The detection means of detection.
To achieve these goals, electric detection means is altered the invention provides a kind of alternating current-direct current of dc source, including every
Straight wave filter, divider, RMS conversion device, A/D samplers, FPGA and audible-visual annunciator, the input of blocking wave filter
It is connected with the dc bus of dc source, the output end of blocking wave filter is connected with the input of divider, the output of divider
End is connected with the input of RMS conversion device, and the output end of RMS conversion device is connected with the input of A/D samplers,
The output end of A/D samplers is connected with the signal input part of FPGA, the signal output part of FPGA and the input of audible-visual annunciator
It is connected.
After being filtered to dc bus using blocking wave filter, AC signal is exported to divider, then by voltage divider
After export to RMS conversion device, exported again to A/D samplers, after A/D sampler samples after the conversion of RMS conversion device
Export again to FPGA, so as to being judged whether to have scurried into AC compounent according to sampled result by FPGA, if AC compounent, then to
Audible-visual annunciator sends alarm signal.
Scheme as a further improvement on the present invention, also including constant current signal source, voltage data collector and MCU, constant current
The output end of signal source is connected with the dc bus of dc source, two inputs of voltage data collector respectively with direct current
Two differences on the dc bus in source are connected, and the signal input part of MCU is connected with the output end of voltage data collector,
The control end of MCU is connected with the input in constant current signal source, and the signal output part of MCU is connected with the input of audible-visual annunciator.
DC source is injected to dc bus using constant current signal source, then by voltage data collector to two differences on dc bus
It is acquired, finally judges whether that direct current is mutually altered according to collection signal by MCU, is mutually altered if there is direct current, then to acousto-optic
Alarm sends alarm signal.
Scheme as a further improvement on the present invention, also including a display screen, the signal input part of display screen respectively with
The signal output part of FPGA is connected with the signal output part of MCU.Testing result is shown using display, facilitates testing staff to inspection
Surveying result carries out on-the-spot record.
The beneficial effects of the present invention are：(1) fast and effeciently AC compounent can be separated from dc bus,
And AC compounent is acquired, and judged whether to have scurried into AC compounent by FPGA, if AC compounent, then by acousto-optic report
Alert device sends alarm；(2) two differences on dc bus are acquired by voltage data collector, then are judged by MCU
Mutually altered with the presence or absence of direct current, mutually altered if there is direct current, then alarm is sent by audible-visual annunciator；(3) inspection is shown using display
Result is surveyed, facilitates testing staff to carry out on-the-spot record to testing result.
Brief description of the drawings
Fig. 1 is AC detection circuit schematic diagram of the invention；
Fig. 2 is that alternating current-direct current of the invention detects circuit diagram；
Fig. 3 is the circuit diagram with display function of the invention.
Specific embodiment
As shown in figure 1, the alternating current-direct current of dc source of the invention alters electric detection means, including blocking wave filter, divider,
RMS conversion device, A/D samplers, FPGA and audible-visual annunciator, the input of blocking wave filter and the direct current of dc source
Bus is connected, and the output end of blocking wave filter is connected with the input of divider, the output end and RMS conversion of divider
The input of device is connected, and AC signal accurately can be converted into direct current signal, RMS conversion by RMS conversion device
The output end of device is connected with the input of A/D samplers, and A/D samplers can complete the sampling of 10000 times per second, A/D samplings
The output end of device is connected with the signal input part of FPGA, and the signal output part of FPGA is connected with the input of audible-visual annunciator.
This detection means operationally, is filtered by blocking wave filter to the signal on dc bus first, is filtered straight
Flow component, only retains AC compounent therein, then again exports to divider AC signal, then is exported by after voltage divider
To RMS conversion device, AC signal is converted into direct current signal by RMS conversion, after the conversion of RMS conversion device again
Output is exported to FPGA again to A/D samplers, after A/D sampler samples, in finally judging direct current according to collection result by FPGA
Whether AC compounent is scurried into, if AC compounent, then alarm has been sent by audible-visual annunciator.
As shown in Fig. 2 in order to the phenomenon for determining whether mutually to be altered with the presence or absence of direct current signal in dc bus, this hair
It is bright also to include constant current signal source, voltage data collector and MCU, the output end in constant current signal source and the dc bus of dc source
It is connected, two inputs of voltage data collector are connected with two differences on the dc bus of dc source respectively, MCU
Signal input part be connected with the output end of voltage data collector, the control end of MCU is connected with the input in constant current signal source,
The signal output part of MCU is connected with the input of audible-visual annunciator.
This detection means operationally, also injects DC source using constant current signal source to dc bus, then by voltage number
Two differences on dc bus are acquired according to collector, finally carrying out judgement to the collection signal for receiving by MCU is
No have direct current and mutually alter, and is mutually altered if there is direct current, then send alarm by audible-visual annunciator.
As shown in figure 3, carrying out on-the-spot record to further facilitate testing staff, the present invention have also been devised also includes one
Display screen, the signal input part of display screen is connected with the signal output part of FPGA and the signal output part of MCU respectively.Using display
Device shows testing result in real time, facilitates testing staff to carry out on-the-spot record to testing result.
Claims (2)
1. a kind of alternating current-direct current of dc source alters electric detection means, it is characterised in that：Including blocking wave filter, divider, really have
Valid value converter, A/D samplers, FPGA and audible-visual annunciator, the input of the blocking wave filter and the direct current of dc source
Bus is connected, and the output end of the blocking wave filter is connected with the input of divider, and the output end of the divider has with really
The input of valid value converter is connected, and the output end of the RMS conversion device is connected with the input of A/D samplers, described
The output end of A/D samplers is connected with the signal input part of FPGA, and the signal output part of the FPGA is defeated with audible-visual annunciator
Enter end to be connected；Also include constant current signal source, voltage data collector and MCU, the output end and direct current in the constant current signal source
The dc bus in source is connected, two inputs of the voltage data collector respectively with the dc bus of dc source on two
Individual difference is connected, and the signal input part of the MCU is connected with the output end of voltage data collector, the control end of the MCU
Input with constant current signal source is connected, and the signal output part of the MCU is connected with the input of audible-visual annunciator.
2. the alternating current-direct current of dc source according to claim 1 alters electric detection means, it is characterised in that：Also include one to show
Display screen, the signal input part of the display screen is connected with the signal output part of FPGA and the signal output part of MCU respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410167101.8A CN103926502B (en) | 2014-04-23 | 2014-04-23 | A kind of alternating current-direct current of dc source alters electric detection means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410167101.8A CN103926502B (en) | 2014-04-23 | 2014-04-23 | A kind of alternating current-direct current of dc source alters electric detection means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103926502A CN103926502A (en) | 2014-07-16 |
| CN103926502B true CN103926502B (en) | 2017-06-23 |
Family
ID=51144795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410167101.8A Active CN103926502B (en) | 2014-04-23 | 2014-04-23 | A kind of alternating current-direct current of dc source alters electric detection means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103926502B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391256A (en) * | 2014-12-03 | 2015-03-04 | 浙江科畅电子有限公司 | Direct-current power supply looped network fault diagnosis device |
| CN105988088B (en) * | 2015-01-30 | 2018-12-04 | 深圳奥特迅电力设备股份有限公司 | A kind of method and system that detection DC bus branch is mutually altered |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08320352A (en) * | 1995-03-20 | 1996-12-03 | Matsushita Electric Ind Co Ltd | Earth leakage detection device |
| CN202421312U (en) * | 2011-12-20 | 2012-09-05 | 首瑞（北京）投资管理集团有限公司 | Device for monitoring alternating current being in series connection with direct current system |
| CN103135038A (en) * | 2013-02-01 | 2013-06-05 | 广州优维电子科技有限公司 | Alternative current electric crosstalk and insulation fault monitoring line selection method of direct current system |
| CN203350333U (en) * | 2013-06-18 | 2013-12-18 | 国家电网公司 | DC (direct current) system alternating current fault detection apparatus |
| CN103698651A (en) * | 2013-12-27 | 2014-04-02 | 国家电网公司 | Method and device for monitoring crossing of direct current insulated buses |
| CN203909197U (en) * | 2014-04-23 | 2014-10-29 | 国家电网公司 | AC/DC channeling detecting device for DC power supply |
-
2014
- 2014-04-23 CN CN201410167101.8A patent/CN103926502B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08320352A (en) * | 1995-03-20 | 1996-12-03 | Matsushita Electric Ind Co Ltd | Earth leakage detection device |
| CN202421312U (en) * | 2011-12-20 | 2012-09-05 | 首瑞（北京）投资管理集团有限公司 | Device for monitoring alternating current being in series connection with direct current system |
| CN103135038A (en) * | 2013-02-01 | 2013-06-05 | 广州优维电子科技有限公司 | Alternative current electric crosstalk and insulation fault monitoring line selection method of direct current system |
| CN203350333U (en) * | 2013-06-18 | 2013-12-18 | 国家电网公司 | DC (direct current) system alternating current fault detection apparatus |
| CN103698651A (en) * | 2013-12-27 | 2014-04-02 | 国家电网公司 | Method and device for monitoring crossing of direct current insulated buses |
| CN203909197U (en) * | 2014-04-23 | 2014-10-29 | 国家电网公司 | AC/DC channeling detecting device for DC power supply |
Non-Patent Citations (2)
| Title |
|---|
| 变电站直流系统两段母线串电分析;李修金等;《江苏电机工程》;20110531;第30卷(第3期);正文第40页左栏倒数第1段-右栏第2段 * |
| 直流系统交流窜电故障监测技术的研究;赵应春等;《电工技术》;20131110(第11期);正文第78页右栏第2-4段以及附图2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103926502A (en) | 2014-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203070069U (en) | Integrated monitoring system for power cable tunnel | |
| CN209102839U (en) | Movable type cable monitors prior-warning device on-line | |
| CN205880122U (en) | Railway link up line cord running state monitoring devices | |
| CN105116283A (en) | Downhole power cable insulation monitoring device | |
| CN102890259B (en) | Line-failure indicator detection system | |
| CN103323655B (en) | Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method | |
| CN105319524A (en) | A high tension switchgear partial discharge live detection effectiveness judgment method | |
| CN103926502B (en) | A kind of alternating current-direct current of dc source alters electric detection means | |
| CN104391256A (en) | Direct-current power supply looped network fault diagnosis device | |
| CN101750540B (en) | Method for detecting parasitic loop of transformer station direct current system | |
| CN104931408A (en) | Method for diagnosing substation grounding-grid corrosion and endpoints | |
| CN102539902A (en) | Method for identifying direct lightning strike and inductive lightning strike of transmission line based on direct measurement of traveling wave | |
| CN103884930A (en) | Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring | |
| CN204065296U (en) | There is the ring main unit fault-indicating system of anti-misoperation function | |
| CN203658521U (en) | Mobile insulation supervision instrument of transformer station DC system | |
| CN203117325U (en) | Operating cable grounding state detecting circuit in dc measurement manner | |
| CN102736003A (en) | Portable partial discharge pulse current sensor | |
| CN202393833U (en) | SiC resistance property detector | |
| CN104330626A (en) | Power grid harmonic wave monitor | |
| CN105277903A (en) | Method for performing remote monitoring on UPS | |
| CN204256102U (en) | Interchange is scurried into and grounding fault searching instrument | |
| CN202886581U (en) | Line fault indicator detecting system | |
| CN103675613B (en) | Transformer station DC system movable type insulation supervision instrument | |
| CN203606415U (en) | On-line monitoring device for grounding current of transformer core | |
| CN205809139U (en) | Oppose electricity-stealing data acquisition unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |