CN101814721B - Direct current protection method with rectifying transformer alternating current protection in direct current power supply system - Google Patents
Direct current protection method with rectifying transformer alternating current protection in direct current power supply system Download PDFInfo
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- CN101814721B CN101814721B CN 200910234335 CN200910234335A CN101814721B CN 101814721 B CN101814721 B CN 101814721B CN 200910234335 CN200910234335 CN 200910234335 CN 200910234335 A CN200910234335 A CN 200910234335A CN 101814721 B CN101814721 B CN 101814721B
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Abstract
The invention discloses a direct current protection method with rectifying transformer alternating current protection in a direct current power supply system. The direct current power supply system comprises a rectifying transformer, a rectifying device, a flow splitter and a direct current breaker which are connected in turn, wherein a direct current protective device accesses an output signal of the flow splitter and comprises a data processing unit capable of setting various types of protection functions, analyzing an input signal, judging whether failure occurs and sending a tripping command. The method is characterized by comprising the following steps: 1) accessing alternating current electric quantity of the rectifying transformer connected with the rectifying device into the data processing unit of the direct current protective device, wherein the data processing unit comprises a direct current data processing unit and an alternating current data processing unit; and 2) performing digital processing and operation on the acquired alternating electric quantity by using the alternating current data processing unit of the direct current protective device to form alternating current protection. The method can avoid additionally and independently configuring an alternating current protective device for the rectifying transformer and can lower system cost.
Description
Technical field
The present invention relates to a kind of relay protecting method 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 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 at the output line of DC power supply shunt is installed; the output of this shunt is through conversion; output in the direct current protecting; 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 rectifier transformer will arrange the AC transformer protective device separately in addition, can increase the cost of equipment.
Summary of the invention
Technical problem to be solved by this invention provides a kind of direct current protecting method, can save equipment cost and can realize excising fast, accurately and safely fault.
For solving the problems of the technologies described above; the invention provides the direct current protecting method that has the rectifying transformer alternating protection in a kind of DC power-supply system; 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; described direct current protecting device comprises and various types of direct current protecting functions is set, the signal of input is 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) 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, described data processing unit comprises the DC data processing unit and exchanges data processing unit;
2) the interchange data processing unit of direct current protecting device through digital processing and computing, forms the AC electric quantity of gathering to exchange protection.
Have the direct current protecting method of rectifying transformer alternating protection in the aforesaid DC power-supply system, it is characterized in that: AC electric quantity inserts direct current protecting device analog quantity or by optical fiber digital quantity or by other form by cable.And the direct current protecting device can have the operation circuit of AC transformer.
The interchange defencive function that can comprise has: overcurrent, impedance, low-voltage, zero sequence overcurrent etc.
The beneficial effect that the present invention reaches:
The present invention can not need in addition the alternating current protective device of configuration rectifier transformer separately, can reduce system cost.But and exchange protection and direct current protecting collaborative work, play a protective role better, for example: the direct current protecting device determines the direct current fault; tripping dc circuit breaker then can start simultaneously and exchanges protection, when through a time delay; the fault direct current is still arranged, then tripping AC circuit breaker.
Embodiment
The direct current protecting method that has the rectifying transformer alternating protection in the DC power-supply system of the present invention; utilize the data processing unit of direct current protecting device; various types of current protections are set; signal to input is analyzed, is judged whether to DC line fault and sends the direct current protecting device of trip command; simultaneously the of ac of the rectifier transformer that links to each other with rectifying device is inserted the direct current protecting device, in the direct current protecting device, comprise the interchange defencive function of rectifier transformer.And the direct current protecting device has the operation circuit of AC transformer.
The present invention can not need in addition the alternating current protective device of configuration rectifier transformer separately, reduces system cost.But and interchange protection and direct current protecting collaborative work; play a protective role better; for example: determine the direct current fault; the tripping dc circuit breaker; can start simultaneously and exchange protection; when through a time delay, fault component is still arranged, then the operation circuit tripping alternating current interruption of direct current protecting device thus.
Claims (3)
1. have the direct current protecting method that rectifying transformer alternating is protected in a DC power-supply system; 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; described direct current protecting device comprises and various types of defencive functions is set, 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, described data processing unit comprises the DC data processing unit and exchanges data processing unit;
2) the interchange data processing unit of direct current protecting device is AC electric quantity process digital processing and the computing of gathering; form and exchange protection; exchange protection and direct current protecting collaborative work; the direct current protecting device determines the direct current fault; tripping dc circuit breaker then starts simultaneously and exchanges protection, when through a time delay; the fault direct current is still arranged, then tripping AC circuit breaker.
2. have the direct current protecting method of rectifying transformer alternating protection in the DC power-supply system according to claim 1, it is characterized in that: AC electric quantity inserts the direct current protecting device to digital quantity by cable analog quantity or by optical fiber.
3. have the direct current protecting method of rectifying transformer alternating protection in the DC power-supply system according to claim 1, it is characterized in that: the direct current protecting device has the operation circuit of AC transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910234335 CN101814721B (en) | 2009-11-24 | 2009-11-24 | Direct current protection method with rectifying transformer alternating current protection in direct current power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910234335 CN101814721B (en) | 2009-11-24 | 2009-11-24 | Direct current protection method with rectifying transformer alternating current protection in direct current power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101814721A CN101814721A (en) | 2010-08-25 |
| CN101814721B true CN101814721B (en) | 2013-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910234335 Active CN101814721B (en) | 2009-11-24 | 2009-11-24 | Direct current protection method with rectifying transformer alternating current protection in direct current power supply system |
Country Status (1)
| Country | Link |
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| CN (1) | CN101814721B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551441A (en) * | 2003-05-15 | 2004-12-01 | 西门子公司 | All fault-current sensitive protection device |
| CN101141061A (en) * | 2007-06-29 | 2008-03-12 | 包头铝业股份有限公司 | Commutation locker cabinet electric arc protecting equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521368B (en) * | 2008-11-20 | 2011-05-04 | 国电南瑞科技股份有限公司 | DC protection system combined with DC bus voltage |
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2009
- 2009-11-24 CN CN 200910234335 patent/CN101814721B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551441A (en) * | 2003-05-15 | 2004-12-01 | 西门子公司 | All fault-current sensitive protection device |
| CN101141061A (en) * | 2007-06-29 | 2008-03-12 | 包头铝业股份有限公司 | Commutation locker cabinet electric arc protecting equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101814721A (en) | 2010-08-25 |
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Owner name: NARI NANJING CONTROL SYSTEM LTD. Effective date: 20141208 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141208 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. |