CN104577974A - Ground fault detection system and method for direct current power system - Google Patents
Ground fault detection system and method for direct current power system Download PDFInfo
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- CN104577974A CN104577974A CN201310482721.6A CN201310482721A CN104577974A CN 104577974 A CN104577974 A CN 104577974A CN 201310482721 A CN201310482721 A CN 201310482721A CN 104577974 A CN104577974 A CN 104577974A
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Abstract
The invention relates to a ground fault detection system and method for a direct current power system. The system comprises a differential current detection device, an AC (alternating current) leakage current filtering device, a microprocessor, a fault removal control device and an alarm display device, wherein the differential current detection device and the fault removal control device are connected onto outlet loops of an output bus of the direct current power system; the AC leakage current filtering device is connected with the differential current detection device; the microprocessor is connected with the AC leakage current filtering device, the fault removal control device and the alarm display device respectively. The method comprises four steps of differential current detection, filtering, threshold determination and fault removal. Compared with the prior art, differential current between the outlet loops of the output bus is collected and subjected to filtering, so that influence of AC leakage current is eliminated, higher detection precision is achieved, the accuracy of ground fault judgment is guaranteed, and the false alarm rate is decreased.
Description
Technical field
The present invention relates to power failure detection field, especially relate to a kind of electric power DC system ground-fault detection system and method.
Background technology
The earth fault of direct current power system is the problem that can not be ignored in electric system always, and earth fault refers to that conductor is connected with the accident of the earth.When the impedance connected is little of when can ignore, this connection is called " dead ground ".The protection of earth fault is divided into three kinds of situations: utilize the overcurrent protection set by distribution line to double as earth-fault protection; Utilize zero-sequence current to be grounded emergency protection; Residual current is utilized to be grounded emergency protection.Therefore needing when earth fault occurs is detect accurately it, realizes the quick protection of fault, but current most ground fault detection device detects sensitive not, easily disturbs by other factors, limited accuracy.
Summary of the invention
Object of the present invention is exactly to overcome the defect and the electric power DC system ground-fault detection system that provides a kind of accuracy of detection high and method that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of electric power DC system ground-fault detection system, comprise differential current detection, AC leakage current filter, micro processor, apparatus, failure removal control device and alarm display apparatus, described differential current detection and failure removal control device are connected to electric power DC system and export on the transmission line circuit of bus, described AC leakage current filter connects differential current detection, and described micro processor, apparatus is connected with AC leakage current filter, failure removal control device and alarm display apparatus respectively.
This detection system also comprises fuse, and this fuse is arranged at electric power DC system and exports on each transmission line circuit of bus.
A kind of electric power DC system earth-fault detecting method, comprises the following steps:
1) difference current between each transmission line circuit of electric power DC system output bus is detected by differential current detection;
2) the AC leakage current component caused by ground capacitance in difference current is eliminated by AC leakage current filter;
3) will filtered difference current be carried out by micro processor, apparatus and predetermined threshold contrasts, if higher than predetermined threshold, then it is determined that the presence of earth fault, perform step 4); If lower than predetermined threshold, then judge to there is not earth fault, return step 1) again detect;
4) micro processor, apparatus sending controling instruction is to failure removal control device, and by failure removal control device disengagement failure loop, alarm display apparatus sends failure warning according to the result of determination of micro processor, apparatus simultaneously.
Compared with prior art, the present invention, by respectively occurring that the difference current between loop gathers to output bus, eliminates the impact of AC leakage current, thus reaches higher accuracy of detection after filtering, ensures the accuracy that earth fault judges, reduces rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system;
Fig. 2 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of electric power DC system ground-fault detection system, comprising: differential current detection 1, exports the difference current of the difference current between each transmission line circuit of bus for detecting straight-flow system; AC leakage current filter 2, for eliminating the AC leakage current component because electrostatic capacitance over the ground causes from difference current; Micro processor, apparatus 3, determines whether to have occurred ground-fault condition by being compared with a predetermined threshold by the current value of above-mentioned AC leakage current cancellation element output; Failure removal control device 4, for disengagement failure loop, realizes protection; With alarm display apparatus 5, for carrying out display alarm to fault; Fuse 6, exports each transmission line circuit of bus for the protection of electric power DC system.
Its annexation is: differential current detection 1 and failure removal control device 4 are connected to electric power DC system and export on the transmission line circuit of bus, AC leakage current filter 2 connects differential current detection 1, micro processor, apparatus 3 is connected with AC leakage current filter 2, failure removal control device 4 and alarm display apparatus 5 respectively, and fuse 6 is arranged at electric power DC system and exports on each transmission line circuit of bus.
A kind of electric power DC system earth-fault detecting method is realized by said system, comprises step as shown in Figure 2:
1) difference current between each transmission line circuit of electric power DC system output bus is detected by differential current detection;
2) the AC leakage current component caused by ground capacitance in difference current is eliminated by AC leakage current filter; Detailed process is leakage meter in AC leakage current filter and wave form analysis circuit, detect the amplitude and phase information of analyzing leakage current, shape information according to leakage current calculates, and the size of offset current and phase place identical with leakage current in contrast, thus carries out elimination filtering.
3) will filtered difference current be carried out by micro processor, apparatus and predetermined threshold contrasts, if higher than predetermined threshold, then it is determined that the presence of earth fault, perform step 4); If lower than predetermined threshold, then judge to there is not earth fault, return step 1) again detect;
4) micro processor, apparatus sending controling instruction is to failure removal control device, and by failure removal control device disengagement failure loop, alarm display apparatus sends failure warning according to the result of determination of micro processor, apparatus simultaneously.
Claims (3)
1. an electric power DC system ground-fault detection system, it is characterized in that, comprise differential current detection, AC leakage current filter, micro processor, apparatus, failure removal control device and alarm display apparatus, described differential current detection and failure removal control device are connected to electric power DC system and export on the transmission line circuit of bus, described AC leakage current filter connects differential current detection, and described micro processor, apparatus is connected with AC leakage current filter, failure removal control device and alarm display apparatus respectively.
2. a kind of electric power DC system ground-fault detection system according to claim 1, it is characterized in that, this detection system also comprises fuse, and this fuse is arranged at electric power DC system and exports on each transmission line circuit of bus.
3. an electric power DC system earth-fault detecting method, is characterized in that, comprises the following steps:
1) difference current between each transmission line circuit of electric power DC system output bus is detected by differential current detection;
2) the AC leakage current component caused by ground capacitance in difference current is eliminated by AC leakage current filter;
3) will filtered difference current be carried out by micro processor, apparatus and predetermined threshold contrasts, if higher than predetermined threshold, then it is determined that the presence of earth fault, perform step 4); If lower than predetermined threshold, then judge to there is not earth fault, return step 1) again detect;
4) micro processor, apparatus sending controling instruction is to failure removal control device, and by failure removal control device disengagement failure loop, alarm display apparatus sends failure warning according to the result of determination of micro processor, apparatus simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482721.6A CN104577974A (en) | 2013-10-15 | 2013-10-15 | Ground fault detection system and method for direct current power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310482721.6A CN104577974A (en) | 2013-10-15 | 2013-10-15 | Ground fault detection system and method for direct current power system |
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| CN104577974A true CN104577974A (en) | 2015-04-29 |
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| CN201310482721.6A Pending CN104577974A (en) | 2013-10-15 | 2013-10-15 | Ground fault detection system and method for direct current power system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548798A (en) * | 2016-02-29 | 2016-05-04 | 珠海格力电器股份有限公司 | Grounding detection method and device for direct current bus |
| CN106443320A (en) * | 2015-08-05 | 2017-02-22 | Abb股份公司 | Method for detecting ground faults in a LVDC electric line and electronic device thereof |
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| US6266219B1 (en) * | 1998-06-02 | 2001-07-24 | Pass & Seymour, Inc. | Combination ground fault and arc fault circuit interrupter |
| CN1373368A (en) * | 2001-02-02 | 2002-10-09 | 佳能株式会社 | Device and method for detecting earthing failure in solar generating system |
| CN2684433Y (en) * | 2003-05-05 | 2005-03-09 | X-L新纳基有限责任公司 | A conductor creepage detection and circuit breaking apparatus in distribution system |
| CN101900771A (en) * | 2009-05-31 | 2010-12-01 | 西门子公司 | RCD (Residual Current Device) detection device and detection method |
| CN203589693U (en) * | 2013-10-15 | 2014-05-07 | 上海中铁通信信号国际工程有限公司 | Power DC system ground fault detecting system |
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2013
- 2013-10-15 CN CN201310482721.6A patent/CN104577974A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266219B1 (en) * | 1998-06-02 | 2001-07-24 | Pass & Seymour, Inc. | Combination ground fault and arc fault circuit interrupter |
| CN1373368A (en) * | 2001-02-02 | 2002-10-09 | 佳能株式会社 | Device and method for detecting earthing failure in solar generating system |
| CN2684433Y (en) * | 2003-05-05 | 2005-03-09 | X-L新纳基有限责任公司 | A conductor creepage detection and circuit breaking apparatus in distribution system |
| CN101900771A (en) * | 2009-05-31 | 2010-12-01 | 西门子公司 | RCD (Residual Current Device) detection device and detection method |
| CN203589693U (en) * | 2013-10-15 | 2014-05-07 | 上海中铁通信信号国际工程有限公司 | Power DC system ground fault detecting system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443320A (en) * | 2015-08-05 | 2017-02-22 | Abb股份公司 | Method for detecting ground faults in a LVDC electric line and electronic device thereof |
| CN106443320B (en) * | 2015-08-05 | 2020-09-08 | Abb股份公司 | Method for detecting ground fault in LVDC wire and electronic device thereof |
| CN105548798A (en) * | 2016-02-29 | 2016-05-04 | 珠海格力电器股份有限公司 | Grounding detection method and device for direct current bus |
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Effective date of registration: 20161024 Address after: 200436 No. 248 West Road, Zhabei District, Shanghai Applicant after: CHINA RAILWAY SIGNAL & COMMUNICATION SHANGHAI ENGINEERING BUREAU GROUP CO., LTD. Address before: 200436 room 86, 88 and three, 501 Road, Zhabei District, Shanghai Applicant before: China Railway Signal & Communication Shanghai Engineering International Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150429 |
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| RJ01 | Rejection of invention patent application after publication |