CN103207350A - Low voltage direct current power distribution fault line selection method - Google Patents
Low voltage direct current power distribution fault line selection method Download PDFInfo
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- CN103207350A CN103207350A CN2012100131278A CN201210013127A CN103207350A CN 103207350 A CN103207350 A CN 103207350A CN 2012100131278 A CN2012100131278 A CN 2012100131278A CN 201210013127 A CN201210013127 A CN 201210013127A CN 103207350 A CN103207350 A CN 103207350A
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Abstract
The invention belongs to the technical field of electric engineering and automation of the electric engineering and provides a low voltage direct current power distribution fault line selection method. When a low voltage direct current power distribution system has a ground fault, current is formed between a fault electrode and the ground through an additional power supply so as to cause unbalance of current between a positive feeder and a negative feeder on a fault feeder, the unbalanced current is detected so as to judge the line with the fault. The low voltage direct current power distribution fault line selection method provides a technological means for rapid detection of the ground fault of the direct current system so as to improve reliability and stability of operation of the low voltage direct current power distribution system.
Description
Technical field
The present invention relates to a kind of low-voltage direct distribution fault selection method, when earth fault appears in the low-voltage direct distribution system, between the fault utmost point and ground, form electric current by additional supply, thereby cause on the fault feeder current imbalance between positive feeder and negative feeder, detect this out-of-balance current, can judge the circuit that breaks down; This method provides technological means for the quick investigation of DC system earth fault, thereby improves low-voltage direct distribution system reliability of operation and stability, belongs to the Electrical Engineering and Its Automation technical field.
Background technology
The low-voltage DC origin system is used industrial circles such as power house, transformer station, operating office widely.In order to satisfy the needs of a plurality of equipment and components and parts direct supply, low-voltage dc power supply need be divided into multiloop output, thereby form the low-voltage direct distribution.In the low-voltage direct distribution system, because the aging or damage of insulation forms earth fault.Single-point does not influence the normal operation of direct-flow distribution system to the multiple spot on earth fault or the same polarity to earth fault, but may develop into short trouble at any time, thereby has brought potential safety hazard for whole direct-flow distribution system, needs investigation as early as possible.Present technology is to monitor earth fault, but has taken place behind the earth fault, specifically is which feedback line has taken place earth fault, can only investigate by the mode that has a power failure one by one; Not only efficient is low for this investigation mode, and workload is big, also influences the normal operation of equipment, and the risk of bringing new accident is arranged.
The present invention proposes a kind of low-voltage direct distribution fault selection method, injects electric current by additional supply between the fault utmost point and ground, produces out-of-balance current at feeder line, by detecting this out-of-balance current, the failure judgement feeder line; The present invention can be implemented in line and detects automatically, has quick, accurate, safe characteristics.
Summary of the invention
When in the low-voltage direct distribution, taking place earth fault, find faulty line for convenience quickly, low-voltage direct distribution fault selection method has been proposed, this method can not only be judged faulty line rapidly and accurately, can also be integrated with the automated watch-keeping facility of DC power system easily, thus the performance of raising DC power system.
To achieve these goals, technical solution of the present invention is:
At dc bus installing ground fault detection device and accessory power supply, additional supply can be that direct current also can be to exchange or the pulse power, power source voltage can be fixing or adjustable, one end ground connection of power supply, the other end can connect with the negative or positive electrode of direct supply by switch, at each feedback line installing current transformer or current sensor of output, detect the electric current algebraic sum of anodal and negative pole.
At first ground fault detection device detects the earth fault of direct-flow distribution system, after detecting earth fault, and judges plus earth or minus earth.Additional supply is applied between earthing pole and the ground by switch, forms a certain size electric current between earthing pole and ground; If current transformer or current sensor by installing on a certain feeder line detect this electric current, then this loop has earth fault.If all feeder lines all detect less than this electric current, then earth fault appears in dc bus.
The present invention has following advantage:
1, failure line selection is accurate.
2, in the process of failure judgement circuit, do not influence the operate as normal of direct-flow distribution system.
3, realize the robotization failure line selection easily, with the monitoring device of DC power system can be convenient integrated.
Embodiment
When the low-voltage direct distribution system takes place earth fault, between the fault utmost point and ground, apply additional supply, the positive feeder on the detection feeder line and the unbalancedness of negative feeder electric current are by the unbalancedness failure judgement circuit of this electric current.
Claims (4)
1. low-voltage direct distribution fault selection method is characterized in that: by apply additional supply between the fault utmost point of straight-flow system and ground, form electric current between the fault utmost point and ground, and by detecting this out-of-balance current at feeder line, judge faulty line.
2. according to the described low-voltage direct distribution fault of claim 1 selection method, it is characterized in that: the additional supply that applies is direct supply, or AC power, or the pulse power; Power source voltage immobilizes, or regulates as required.
3. according to the described low-voltage direct distribution fault of claim 1 selection method, it is characterized in that: the unbalanced current detection device on the feeder line is current transformer or current sensor.
4. according to the described low-voltage direct distribution fault of claim 1 selection method, it is characterized in that: this method can be used separately, also can with the integrated use of other monitoring system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100131278A CN103207350A (en) | 2012-01-17 | 2012-01-17 | Low voltage direct current power distribution fault line selection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100131278A CN103207350A (en) | 2012-01-17 | 2012-01-17 | Low voltage direct current power distribution fault line selection method |
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| Publication Number | Publication Date |
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| CN103207350A true CN103207350A (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012100131278A Pending CN103207350A (en) | 2012-01-17 | 2012-01-17 | Low voltage direct current power distribution fault line selection method |
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| CN (1) | CN103207350A (en) |
Cited By (4)
| 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 |
| US9762047B2 (en) | 2015-06-16 | 2017-09-12 | Abb Technology Ltd. | Technologies for zonal fault protection of DC distribution systems |
| CN107515356A (en) * | 2017-10-23 | 2017-12-26 | 华北电力大学（保定） | A kind of DC distribution net system and its method for diagnosing faults |
| CN112327207A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Portable direct current system ground fault judgment device and use method thereof |
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| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN201359630Y (en) * | 2009-03-03 | 2009-12-09 | 济南大学 | DC injection-type line selection and positioning device adopting self-adapting adjustable resistor |
| CN102004213A (en) * | 2010-10-26 | 2011-04-06 | 上海天晶电力科技发展有限公司 | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument |
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2012
- 2012-01-17 CN CN2012100131278A patent/CN103207350A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN201359630Y (en) * | 2009-03-03 | 2009-12-09 | 济南大学 | DC injection-type line selection and positioning device adopting self-adapting adjustable resistor |
| CN102004213A (en) * | 2010-10-26 | 2011-04-06 | 上海天晶电力科技发展有限公司 | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument |
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| 金伟一等: "配出中性线的IT***及其接地故障分析", 《电气技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9762047B2 (en) | 2015-06-16 | 2017-09-12 | Abb Technology Ltd. | Technologies for zonal fault protection of DC distribution systems |
| 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 |
| CN107515356A (en) * | 2017-10-23 | 2017-12-26 | 华北电力大学（保定） | A kind of DC distribution net system and its method for diagnosing faults |
| CN112327207A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Portable direct current system ground fault judgment device and use method thereof |
| CN112327207B (en) * | 2020-10-31 | 2022-09-16 | 贵州电网有限责任公司 | Portable direct current system ground fault judgment device and use method thereof |
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Application publication date: 20130717 |