CN103575965A - Direct current system monitoring device and method - Google Patents
Direct current system monitoring device and method Download PDFInfo
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- CN103575965A CN103575965A CN201210283539.3A CN201210283539A CN103575965A CN 103575965 A CN103575965 A CN 103575965A CN 201210283539 A CN201210283539 A CN 201210283539A CN 103575965 A CN103575965 A CN 103575965A
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Abstract
The invention discloses a method for monitoring an alternating current power supply connected into a direct current power supply system in a transformer substation and a power plant. According to a direct current system monitoring device and method, the positive electrode and negative electrode of a direct current power supply loop of the transformer substation and the power plant are respectively provided with a nonpolarity coupling capacitor, the output ends of the two nonpolarity coupling capacitors are connected into a voltage indicator, and an alternating voltage of a direct current system can be read through the voltage indicator. According to the direct current system monitoring device and method, the alternating voltage is tested through the coupling capacitors installed in a direct current power supply and transmitted to the voltage indicator, the voltage indicator contrasts the monitored alternating voltage with a voltage value specified for the voltage indicator and gives an alarm at the same time, as a result, whether the alternating current power supply is connected into the direct current power supply can be judged so as to avoid rejection to operation or maloperation of a retaining device, and the situation that the alternating current power supply is connected into the direct current power supply in the transformer substation and the power plant can be well monitored.
Description
Technical field
The present invention relates to a kind of monitoring device, particularly relate to a kind of straight-flow system monitoring device; The invention still further relates to a kind of monitoring method of utilizing this monitoring system.
Background technology
In transformer station and generating plant direct supply, be an isolated neutral system, alternating voltage is the system of a ground connection.Once direct supply has AC power to scurry into, usually can there is the stack of alternating current-direct current signal, or produce DC earthing phenomenon, caused protective device generation tripping and nonaction.
，Ge transformer station and generating plant direct supply all do not set up relevant AC power to scurry into monitoring device and the method for direct current at present, conventionally after protection malfunction or tripping accident occur electrical network, by analyzing, judge, check, find out AC power.This mode is the work consuming danger that also increased consuming time both.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of monitoring device of direct current, can find out fast and effectively AC power.
For solving the problems of the technologies described above, a kind of straight-flow system monitoring device provided by the invention, is characterized in that, comprising:
One power supply;
One first capacitor, is arranged at the positive pole of described power supply;
One second capacitor, is arranged at the negative pole of described power supply;
One voltage table, is connected to the output terminal of described the first capacitor and the second capacitor;
One monitor screen, changes for supervisory system alternating voltage;
Wherein, the first capacitor and the second capacitor are for being coupled the alternating voltage of direct supply, and voltage table carries out voltage indication, when the magnitude of voltage detecting when monitor screen surpasses the magnitude of voltage of regulation, send alerting signal.
Further, described the first capacitor and described the second capacitor are nonpolarity coupling condenser.
Further, also comprise a switch, for controlling the whether conducting of described monitor screen.
A monitoring method for straight-flow system, comprising:
Step 1, the first capacitor and the second capacitor-coupled are to the alternating voltage in direct supply;
Step 2, voltage table read described alternating voltage;
Step 3, the ac voltage measuring when observing and controlling screen send alerting signal 203 in time while being greater than the magnitude of voltage of regulation.
Practical straight-flow system monitoring device of the present invention can be monitored the alternating voltage transfiniting fast and effectively, and whole system is safe and reliable, can obviously lower operations staff's danger.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is straight-flow system monitoring device schematic diagram of the present invention;
Fig. 2 is straight-flow system monitoring method process flow diagram of the present invention.
Critical piece mark is as follows:
Power supply 1 first capacitor 2
The second capacitor 3 voltage tables 4
Switch 5 monitor screens 6
Embodiment
For making auditor better understand the present invention, be now described below by reference to the accompanying drawings.
As shown in Figure 1, straight-flow system monitoring device of the present invention comprises, the first capacitor 2 of one power supply 1, power supply 1 positive terminal, the second capacitor 3 and the two electric capacity output terminals of power supply 1 negative pole end are connected by a voltage table 4, and a monitor screen 6, changes and report to the police for monitoring system alternating voltage.The first described capacitor 2 and the second capacitor 3 are nonpolarity coupling condenser.In addition, the present invention can also set up a switch 5 in monitor screen 6 one end, for controlling monitor screen 6, whether adds work.
As shown in Figure 2, straight-flow system monitoring method of the present invention, comprising:
1, the first capacitor and the second capacitor-coupled are to the alternating voltage 201 in direct supply.
2, voltage table reads described alternating voltage 202.
3, the ac voltage measuring when observing and controlling screen sends alerting signal 203 in time while being greater than the magnitude of voltage of regulation.
When operations staff receives alerting signal, in the very first time, report scheduling and carry out next step check processing, avoid occurring power grid accident.
By specific embodiment, the present invention is had been described in detail above, but these are not construed as limiting the invention.Without departing from the principles of the present invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (4)
1. a straight-flow system monitoring device, is characterized in that, comprising:
One power supply;
One first capacitor, is arranged at the positive pole of described power supply;
One second capacitor, is arranged at the negative pole of described power supply;
One voltage table, is connected to the output terminal of described the first capacitor and the second capacitor;
One monitor screen, changes for supervisory system alternating voltage;
Wherein, the first capacitor and the second capacitor are for being coupled the alternating voltage of direct supply, and voltage table carries out voltage indication, when the magnitude of voltage detecting when monitor screen surpasses the magnitude of voltage of regulation, send alerting signal.
2. straight-flow system monitoring device as claimed in claim 1, is characterized in that, described the first capacitor and described the second capacitor are nonpolarity coupling condenser.
3. straight-flow system monitoring device as claimed in claim 1, is characterized in that, also comprises a switch, for controlling the whether conducting of described monitor screen.
4. a monitoring method for straight-flow system, is characterized in that, comprising:
Step 1, the first capacitor and the second capacitor-coupled are to the alternating voltage in direct supply;
Step 2, voltage table read described alternating voltage;
Step 3, the ac voltage measuring when observing and controlling screen send alerting signal 203 in time while being greater than the magnitude of voltage of regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210283539.3A CN103575965A (en) | 2012-08-02 | 2012-08-02 | Direct current system monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210283539.3A CN103575965A (en) | 2012-08-02 | 2012-08-02 | Direct current system monitoring device and method |
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| CN103575965A true CN103575965A (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210283539.3A Pending CN103575965A (en) | 2012-08-02 | 2012-08-02 | Direct current system monitoring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942273A (en) * | 2017-10-24 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | The accuracy calibration method of monitoring device is scurried into exchange in DC power system |
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| CN101316050A (en) * | 2007-12-26 | 2008-12-03 | 上海市电力公司超高压输变电公司 | Method and device for monitoring running state of transforming station direct current system |
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Patent Citations (6)
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| JP2002350475A (en) * | 2001-05-23 | 2002-12-04 | Nec Eng Ltd | Negative voltage monitoring circuit |
| CN101316050A (en) * | 2007-12-26 | 2008-12-03 | 上海市电力公司超高压输变电公司 | Method and device for monitoring running state of transforming station direct current system |
| CN201359629Y (en) * | 2008-12-30 | 2009-12-09 | 浙江省送变电工程公司 | Direct-current power supply grounding alarm device |
| 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 |
| CN202177680U (en) * | 2011-08-22 | 2012-03-28 | 广州优维电子科技有限公司 | Portable DC earthing fault search instrument |
| CN202710647U (en) * | 2012-08-02 | 2013-01-30 | 温州市科星电子有限公司 | Monitoring device for direct current system |
Non-Patent Citations (2)
| Title |
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| 余荣胜: "一起交流串入直流回路故障原因的分析与处理", 《江西电力》 * |
| 温州市科星电子有限公司: "KX-DCX1交流电源串入电流电源报警装置", 《HTTP://WWW.WZKXDZ.CN/NEWS_DETAIL.ASP?NEWSID=617》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942273A (en) * | 2017-10-24 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | The accuracy calibration method of monitoring device is scurried into exchange in DC power system |
| CN107942273B (en) * | 2017-10-24 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | accuracy calibration method for alternating current entering monitoring device in direct current power supply system |
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Application publication date: 20140212 |