CN101521368B - DC protection system combined with DC bus voltage - Google Patents
DC protection system combined with DC bus voltage Download PDFInfo
- Publication number
- CN101521368B CN101521368B CN2008102340591A CN200810234059A CN101521368B CN 101521368 B CN101521368 B CN 101521368B CN 2008102340591 A CN2008102340591 A CN 2008102340591A CN 200810234059 A CN200810234059 A CN 200810234059A CN 101521368 B CN101521368 B CN 101521368B
- Authority
- CN
- China
- Prior art keywords
- bus
- direct current
- signal
- voltage
- current
- 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
Images
Abstract
The invention discloses a DC protection system combined with DC bus voltage. The system comprises a DC circuit breaker, a current divider, an isolation-amplification unit and a DC protection device, wherein the DC circuit breaker is positioned on an output line of a DC power source; the current divider is positioned on the output line of the DC power source and can convert DC of a DC system into weak-voltage signals; the isolation-amplification unit is connected with the current divider and can amplify the weak-voltage signals output by the current divider; and the DC protection device is connected with the isolation-amplification unit, comprises a data processing unit, and can set various types of current protection, analyze input signals, judge whether DC line faults exist and sent out tripping instructions. The system is characterized in that a voltage signal led out from a DC bus is connected to the input end of the isolation-amplification unit through a voltage conversion unit. The system has the advantages of taking the DC bus as an auxiliary criterion, effectively excluding noise and interfering signals and accurately cutting off fault current.
Description
Technical field
The present invention relates to a kind of relaying protection system, specifically a kind of DC protection system that can be applicable to the combined with DC bus voltage in the DC power-supply system belongs to electrical technology field.
Background technology
DC power-supply system outputs in the rectifying device after by rectifier transformer the voltage of ac power supply system being adjusted to the rectifying device required voltage usually, and through the rectification of rectifying device, the output of rectifying device is the DC power supply that DC power-supply system needs.
Usually on the output line of DC power supply, shunt is installed; this shunt converts the direct current of direct current system to light current and presses signal; through isolating the conversion of amplifying unit, output in the direct current protecting device, as the primary signal of direct current protecting device input; the direct current protecting device is analyzed based on this signal; various types of current protections are set, and are DC line faults if judge, and then send trip command; fault is eliminated in the dc circuit breaker tripping.The weak point that this scheme exists is:
At first, direct current system is a power frequency component unlike AC system, extracts characteristic signal easily, filtering interfering, and direct current system is not owing to having power frequency component as the essential characteristic amount, so be difficult to the load current of fault current and sudden change and interference are made a distinction.
Secondly, shunt converts dc current signal to voltage signal, and signal is very weak, though through isolating the conversion of amplifying unit, noise and interference also are exaggerated, so be difficult to fault-signal is distinguished.
Summary of the invention
Technical problem to be solved by this invention provides a kind ofly can effectively get rid of noise and interference signal, accurately the DC protection system of disengagement failure electric current.
For solving the problems of the technologies described above, the invention provides a kind of DC protection system of combined with DC bus voltage, comprise
Be positioned at the dc circuit breaker on the output line of DC power supply;
Be positioned on the output line of DC power supply, the direct current of direct current system can be converted to the shunt that light current is pressed signal;
The isolation amplifying unit that joins with shunt, can press signal to amplify the light current of shunt output;
With isolate amplifying unit and join, comprise data processing unit, various types of current protections can be set, the signal of input is analyzed, judged whether to DC line fault and sends the direct current protecting device of trip command,
It is characterized in that: one road voltage signal of drawing from dc bus is connected to isolation amplifying unit input by voltage conversion unit, and the DC bus-bar voltage that utilization has been gathered is as the assistant criteria of direct current protection, and concrete deterministic process may further comprise the steps:
1) when dc current signal suddenlys change, checks DC bus-bar voltage simultaneously;
2) if when direct current increases, DC bus-bar voltage descends, and then may be to break down, if be fault really, then sends trip signal by the direct current protecting device, and the dc circuit breaker tripping is with the excision fault;
3) if when direct current increases, DC bus-bar voltage does not descend, and then is to disturb or noise, and the direct current protecting device does not send trip signal.
The direct current protecting observe and control device is gathered DC bus-bar voltage; be used for protection and supervision; DC bus-bar voltage is passed through voltage conversion unit; again through isolating amplifying unit; the signal of DC bus-bar voltage is sent to data processing unit in the direct current protecting device; this d. c. voltage signal is a large-signal with respect to dc current signal, thus can combined with DC bus as assistant criteria, the direct current protection is set.
The beneficial effect that the present invention reached:
The DC protection system of combined with DC bus voltage of the present invention sends to data processing unit in the direct current protecting device to the signal of DC bus-bar voltage; this d. c. voltage signal is a large-signal with respect to dc current signal; so can be with DC bus-bar voltage as assistant criteria; can effectively get rid of noise and interference signal, accurately the disengagement failure electric current.
Description of drawings
Fig. 1 is the DC protection system structural representation of combined with DC bus voltage of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.Fig. 1 is the DC protection system structural representation of combined with DC bus voltage of the present invention.
The invention provides a kind of DC protection system of combined with DC bus voltage, comprise
Be positioned at the dc circuit breaker on the output line of DC power supply;
Be positioned on the output line of DC power supply, the direct current of direct current system can be converted to the shunt that light current is pressed signal;
The isolation amplifying unit that joins with shunt, can press signal to amplify the light current of shunt output;
With isolate amplifying unit and join, comprise data processing unit, various types of current protections can be set, the signal of input is analyzed, judged whether to DC line fault and sends the direct current protecting device of trip command,
It is characterized in that: one road voltage signal of drawing from dc bus is connected to isolation amplifying unit input by voltage conversion unit.
The course of work of the DC protection system of combined with DC bus voltage of the present invention is: when dc current signal suddenlys change, check DC bus-bar voltage simultaneously.When if direct current increases, DC bus-bar voltage descends, and then may be to break down.If be fault really, then send trip signal by the direct current protecting device, the dc circuit breaker tripping is with the excision fault.When if direct current increases, DC bus-bar voltage does not descend, and then may be to disturb or noise, and then the direct current protecting device does not send trip signal, therefore this interference of filtering or noise effectively.
The DC protection system of combined with DC bus voltage of the present invention is under the situation that does not increase the investment of primary equipment and secondary device; utilize DC bus-bar voltage that the direct current protecting observe and control device gathered as assistant criteria, improve fail safe, rapidity and the sensitivity of direct current protection.
Claims (1)
1. the DC protection system of a combined with DC bus voltage comprises:
Be positioned at the dc circuit breaker on the output line of DC power supply;
Be positioned on the output line of DC power supply, the direct current of direct current system can be converted to the shunt that light current is pressed signal;
The isolation amplifying unit that joins with shunt, can press signal to amplify the light current of shunt output;
With isolate amplifying unit and join, comprise data processing unit, various types of current protections can be set, the signal of input is analyzed, judged whether to DC line fault and sends the direct current protecting device of trip command,
It is characterized in that: one road voltage signal of drawing from dc bus is connected to isolation amplifying unit input by voltage conversion unit, and the DC bus-bar voltage that utilization has been gathered is as the assistant criteria of direct current protection, and concrete deterministic process may further comprise the steps:
1) when dc current signal suddenlys change, checks DC bus-bar voltage simultaneously;
2) if when direct current increases, DC bus-bar voltage descends, and then may be to break down, if be fault really, then sends trip signal by the direct current protecting device, and the dc circuit breaker tripping is with the excision fault;
3) if when direct current increases, DC bus-bar voltage does not descend, and then is to disturb or noise, and the direct current protecting device does not send trip signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102340591A CN101521368B (en) | 2008-11-20 | 2008-11-20 | DC protection system combined with DC bus voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102340591A CN101521368B (en) | 2008-11-20 | 2008-11-20 | DC protection system combined with DC bus voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101521368A CN101521368A (en) | 2009-09-02 |
| CN101521368B true CN101521368B (en) | 2011-05-04 |
Family
ID=41081801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102340591A Active CN101521368B (en) | 2008-11-20 | 2008-11-20 | DC protection system combined with DC bus voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101521368B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814721B (en) * | 2009-11-24 | 2013-10-09 | 国电南瑞科技股份有限公司 | Direct current protection method with rectifying transformer alternating current protection in direct current power supply system |
| CN101707356B (en) * | 2009-11-24 | 2012-01-25 | 国电南瑞科技股份有限公司 | DC protection method by using analog AC rectification in DC supply system |
| CN101764394B (en) * | 2009-11-24 | 2012-06-20 | 国电南瑞科技股份有限公司 | Direct current differential protection method of rectification unit |
| CN101707357B (en) * | 2009-11-24 | 2012-04-25 | 国电南瑞科技股份有限公司 | DC protection method by using AC electric quantity for verification in DC supply system |
| CN102255275A (en) * | 2011-08-01 | 2011-11-23 | 常熟开关制造有限公司(原常熟开关厂） | DC low voltage circuit breaker protection device |
| CN104184124B (en) * | 2014-08-15 | 2017-09-29 | 北京人民电器厂有限公司 | Dc circuit breaker and overload protection method that high frequency switch power supply system is used |
| CN107069647A (en) * | 2016-12-07 | 2017-08-18 | 上海磊跃自动化设备有限公司 | Intelligent direct-current controller applied to DC circuit Control protection system |
| CN109752583A (en) * | 2018-12-04 | 2019-05-14 | 上海电器科学研究所（集团）有限公司 | A kind of isolated DC current detection circuit with prime protection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2565028Y (en) * | 2002-08-27 | 2003-08-06 | 北京华星恒业电气设备有限公司 | Module for detecting insulation resistance of DC system |
| CN101257201A (en) * | 2007-02-09 | 2008-09-03 | 天津新技术产业园区凯发电气成套设备有限公司 | Direct current protecting observe and control system |
-
2008
- 2008-11-20 CN CN2008102340591A patent/CN101521368B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2565028Y (en) * | 2002-08-27 | 2003-08-06 | 北京华星恒业电气设备有限公司 | Module for detecting insulation resistance of DC system |
| CN101257201A (en) * | 2007-02-09 | 2008-09-03 | 天津新技术产业园区凯发电气成套设备有限公司 | Direct current protecting observe and control system |
Non-Patent Citations (1)
| Title |
|---|
| 王军等.地铁牵引变电所直流保护隔离放大器的研制.《城市轨道交通研究》.2008,(第8期),第43-46、52页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101521368A (en) | 2009-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101521368B (en) | DC protection system combined with DC bus voltage | |
| US9865411B2 (en) | Safety device for a photovoltaic system | |
| CN207684680U (en) | Band-type brake coil control circuit, band-type brake control power-supply device and elevator | |
| EP3467525A1 (en) | Noise generation circuit, self-test circuit, afci and photovoltaic power generation system | |
| CN102801131B (en) | A kind of neutral line breakage detection protection method and device | |
| CN201805222U (en) | Series fault arc detection device adopting wavelet entropy | |
| CN201331555Y (en) | Power unit input open-phase detector of high-voltage inverter | |
| CN101447667A (en) | High voltage transducer power unit input phase loss detector | |
| JP2005024469A (en) | Higher harmonic monitoring system, and higher harmonic monitoring method | |
| CN104332948A (en) | Arc fault protection device | |
| CN201562031U (en) | Alternating-current induction voltage withstand testing device of graded insulating type voltage transformer | |
| CN101582632A (en) | Switching power supply and electric equipment using switching power supply | |
| CN102761098B (en) | Device and method for residual current protection | |
| CN103384062A (en) | Isolation control system of grid power distribution fault detection | |
| CN105244994A (en) | Power switch and standby control power supply system for internal control devices of power switch | |
| CN102324723B (en) | Flameproof phase-sensitive short circuit protection feed switch and working method thereof | |
| CN101707357B (en) | DC protection method by using AC electric quantity for verification in DC supply system | |
| CN103107519B (en) | A kind of protective relaying device of large-scale Rectification Power Factor | |
| CN205489493U (en) | Arc light protective device | |
| CN204835513U (en) | Voltage type arc light protection device | |
| CN204069002U (en) | Based on number, the electric simultaneous interpretation device of insulate line remote auto power supply technique | |
| CN203595753U (en) | Alternating-current component detection device for direct-current power supply | |
| CN203574349U (en) | Vehicle power supply security control device | |
| CN101202432B (en) | Control method of relay control circuit | |
| CN206698019U (en) | A kind of mining low tension switch microcomputer monitor and protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NARI NANJING CONTROL SYSTEM LTD. Effective date: 20141202 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141202 Address after: High road high tech Development Zone Nanjing city Jiangsu province 210061 No. 20 Patentee after: NARI Technology Development Co., Ltd. Patentee after: SGCC NARI Nanjing Control System Co., Ltd. Address before: High road high tech Development Zone Nanjing city Jiangsu province 210061 No. 20 Patentee before: NARI Technology Development Co., Ltd. |