CN101764394B - Direct current differential protection method of rectification unit - Google Patents
Direct current differential protection method of rectification unit Download PDFInfo
- Publication number
- CN101764394B CN101764394B CN2009102343378A CN200910234337A CN101764394B CN 101764394 B CN101764394 B CN 101764394B CN 2009102343378 A CN2009102343378 A CN 2009102343378A CN 200910234337 A CN200910234337 A CN 200910234337A CN 101764394 B CN101764394 B CN 101764394B
- Authority
- CN
- China
- Prior art keywords
- direct current
- data processing
- processing unit
- rectifying
- differential protection
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct current (DC) differential protection method of a rectification unit, comprising the following steps of: (1) inputting alternating current (AC) amount of a rectifier transformer connected with a rectifier into a data processing unit of a DC protection device, wherein the data processing unit comprises a DC data processing unit and an AC data processing unit; (2) arranging a simulation AC rectifying module in the data processing unit, wherein the AC amount is simulation rectifying current value obtained by the simulation AC rectifying module; (3) forming the differential protection by the simulation rectifying current value and DC value obtained in the DC protection device so as to completely protect the rectifying unit. In the invention, the method can strictly distinguish faults in an area or out of the area due to the formed differential protection, and because the response on the faults in the rectifying unit is sensitive, the rectifying unit can be efficiently protected. Because a primary system is usually configured with a current transducer for collecting the AC, the cost of the system is not increased.
Description
Technical field
The present invention relates to a kind of relaying protection that can be applicable in the DC power-supply system, belong to electrical technology field.
Background technology
DC power-supply system outputs in the rectifying device after adjusting to the rectifying device required voltage to the voltage of ac power supply system through rectifier transformer usually, and through the rectification of rectifying device, the output of rectifying device is the DC power supply that DC power-supply system needs.Rectifier transformer and rectifying device constitute rectification unit.
Usually on the output line of DC power supply, shunt is installed, the output of this shunt outputs in the direct current protecting through conversion; Primary signal as the input of direct current protecting device; The direct current protecting device is analyzed based on this signal, is DC line fault if judge, and then sends trip command; Fault is eliminated in the dc circuit breaker tripping.
Usually the alternating current protection of current transformer is picked up from the protection of rectifier transformer, and sensitivity is not high, and rectifying device is not established protection usually, leans on the interchange protection of rectifier transformer to come indirect protection, and sensitivity is poorer.
Summary of the invention
Technical problem to be solved by this invention provides a kind of guard method of highly sensitive rectifying device.
State technology for solving problem; The present invention provides a kind of direct current differential protection method of rectification unit; Rectification unit comprises rectifier transformer and the rectifying device that links to each other successively, and said rectifying device links to each other with the direct current protecting device, and said direct current protecting device comprises the isolation amplifying unit; Comprise various types of direct current protecting functions can being set, the signal of input being analyzed, judged whether to DC line fault and sends the data processing unit of trip command, it is characterized in that: may further comprise the steps
1) can perhaps pass through the data processing unit that optical fiber inserts digital quantity in the direct current protecting device to the AC electric quantity of the rectifier transformer that links to each other with rectifying device to analog quantity through cable; Said data processing unit comprises the dc data processing unit and exchanges data processing unit that said AC electric quantity draws the input of self-rectifying transformer;
2) utilize the simulation rectification module in the said data processing unit that alternating current is simulated rectification, obtain simulating the rectified current flow valuve;
3) will simulate the rectified current flow valuve and constitute differential protection with the DC current values of in the direct current protecting device, directly gathering, and come rectification unit is carried out complete protection with this, said DC current values is the signal of shunt output.
The beneficial effect that the present invention reached:
The advantage of guard method of the present invention is owing to constituted differential protection, can strictly distinguish in the district and external area error, and sensitive to the fault reaction in the rectification unit, can effectively protect rectification unit.Owing to disposed the current transformer that is used to gather alternating current usually in the primary system, so this rectification unit DC differential protection does not increase the cost of system.
Description of drawings
Fig. 1 is that each device in the direct current differential protection method of rectification unit of the present invention connects sketch map.
Embodiment
The present invention provides a kind of direct current differential protection method of rectification unit; Rectification unit comprises rectifier transformer and the rectifying device that links to each other successively; Said rectifying device links to each other with the direct current protecting device; Said direct current protecting device comprises the isolation amplifying unit, comprises various types of direct current protecting functions can be set, the signal of input be analyzed, judged whether to DC line fault and sends the data processing unit of trip command, the data processing unit of the AC electric quantity of the rectifier transformer that links to each other with rectifying device access direct current protecting device; Use the software simulation rectification to alternating current; Obtain simulating the rectified current flow valuve, constitute differential protection to it and the DC current values of in the direct current protecting device, gathering, come rectification unit is carried out complete protection with this.
Because the mutual inductor ratio of the no-load voltage ratio of the amplitude of the sampled value of AC side size and rectifier transformer, the no-load voltage ratio of instrument transformer, direct current protecting device is relevant; And the sampled value of DC side changes relevant with the no-load voltage ratio of shunt, the conversion of direct current protecting device; So they the two amplitude is unequal; So in practical application, the reduction coefficient is set for the sampled value of AC side, after its reduction; Use the software simulation rectification again, the direct current signal of value after this rectification and direct current protecting device Direct Sampling constitutes differential protection.
Claims (2)
1. direct current differential protection method of rectification unit; A kind of DC power-supply system comprises rectifier transformer, rectifying device, shunt and the dc circuit breaker that links to each other successively; The direct current protecting device inserts the output signal of shunt; Said direct current protecting device comprises can be provided with various types of defencive functions, the signal of input is analyzed, judged whether fault and sends the data processing unit of trip command, it is characterized in that, may further comprise the steps:
1) the data processing unit of the AC electric quantity of the rectifier transformer that links to each other with rectifying device access direct current protecting device; Said data processing unit comprises the dc data processing unit and exchanges data processing unit that said AC electric quantity draws the input of self-rectifying transformer;
2) the analog AC rectification module is set in data processing unit, AC electric quantity obtains simulating the rectified current flow valuve through the analog AC rectification module;
3) will simulate the rectified current flow valuve and constitute differential protection with the DC current values of in the direct current protecting device, gathering, and come rectification unit is carried out complete protection with this, said DC current values is the signal of shunt output.
2. direct current differential protection method of rectification unit according to claim 1 is characterized in that: AC electric quantity inserts the direct current protecting device to digital quantity through cable analog quantity or through optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102343378A CN101764394B (en) | 2009-11-24 | 2009-11-24 | Direct current differential protection method of rectification unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102343378A CN101764394B (en) | 2009-11-24 | 2009-11-24 | Direct current differential protection method of rectification unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101764394A CN101764394A (en) | 2010-06-30 |
| CN101764394B true CN101764394B (en) | 2012-06-20 |
Family
ID=42495427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102343378A Active CN101764394B (en) | 2009-11-24 | 2009-11-24 | Direct current differential protection method of rectification unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101764394B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218543B (en) * | 2013-05-30 | 2016-12-28 | 南京南瑞继保电气有限公司 | Current source type converter differential protecting method |
| CN106066447B (en) * | 2016-07-04 | 2018-12-04 | 许昌许继软件技术有限公司 | The method of discrimination and system of rectifier transformer valve side direct current system short trouble |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2342507Y (en) * | 1998-09-17 | 1999-10-06 | 郑云辉 | Charging and discharging protector for DC operation power source |
| CN101232177A (en) * | 2008-01-29 | 2008-07-30 | 西安交通大学 | HVDC transmission line distance protecting method |
| CN101521368A (en) * | 2008-11-20 | 2009-09-02 | 国电南瑞科技股份有限公司 | DC protection system combined with DC bus voltage |
-
2009
- 2009-11-24 CN CN2009102343378A patent/CN101764394B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2342507Y (en) * | 1998-09-17 | 1999-10-06 | 郑云辉 | Charging and discharging protector for DC operation power source |
| CN101232177A (en) * | 2008-01-29 | 2008-07-30 | 西安交通大学 | HVDC transmission line distance protecting method |
| CN101521368A (en) * | 2008-11-20 | 2009-09-02 | 国电南瑞科技股份有限公司 | DC protection system combined with DC bus voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101764394A (en) | 2010-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101420116A (en) | Intelligent integrated electricity leakage protection device | |
| CN106646120A (en) | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal | |
| CN101764394B (en) | Direct current differential protection method of rectification unit | |
| CN109406897A (en) | Detection device and detection method | |
| CN204882848U (en) | Photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side | |
| CN105068033A (en) | Verification device for photoelectric current transformer and method thereof | |
| CN101707357B (en) | DC protection method by using AC electric quantity for verification in DC supply system | |
| CN201765271U (en) | Signal conditioner for power grid signal acquisition | |
| CN103900777A (en) | Strut type electronic current transformer one-time vibration detecting device and method | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN100358205C (en) | All fault-current sensitive protection device | |
| CN207215898U (en) | A kind of portable oscillograph with breaker Dynamic Characteristics function | |
| CN106526298B (en) | A kind of zero sequence current measurement device and its mode of connection | |
| CN110018384A (en) | Method for detecting the ground fault condition in power conversion unit | |
| CN102073277A (en) | Computer control system for power frequency insulating test | |
| CN106324407B (en) | Detector for secondary resonance elimination device of voltage transformer | |
| CN205544591U (en) | Power station monitoring system is joined in marriage to touch -sensitive screen | |
| CN101860005B (en) | Uninterrupted power test residual current protective device | |
| CN206960595U (en) | A kind of FTU devices for possessing adaptive singlephase earth fault identification | |
| CN107888471A (en) | A kind of electrical isolation formula USB RS485 converters | |
| CN201903622U (en) | Voltage resistance tester | |
| CN207571206U (en) | A kind of lightning arrestor movement detecting system based on traveling wave detector | |
| CN101707356B (en) | DC protection method by using analog AC rectification in DC supply system | |
| CN102110975A (en) | Microcomputer monitoring motor protector | |
| CN201199628Y (en) | Protecting equipment for electric force power distribution PLC control detection line |
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: 20141128 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141128 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. |