CN2826788Y - Middle/low pressure short circuit optical fibre differential protection device - Google Patents
Middle/low pressure short circuit optical fibre differential protection device Download PDFInfo
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- CN2826788Y CN2826788Y CN 200520074456 CN200520074456U CN2826788Y CN 2826788 Y CN2826788 Y CN 2826788Y CN 200520074456 CN200520074456 CN 200520074456 CN 200520074456 U CN200520074456 U CN 200520074456U CN 2826788 Y CN2826788 Y CN 2826788Y
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- circuit
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- relay
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a middle or low pressure short circuit optical fiber differential protection device, which belongs to an innovation application of optical fiber current differential protection in middle or low voltage electrical power system short circuit. The utility model comprises a pair of protection devices for a main machine which are connected by optical fibers in a protection circuit and a protection device for an accessory machine, wherein the protection devices for the main machine and the accessory machine are composed of a subsidiary transducer, a low-pass filters, an analog digital converter, CPU, RAM, ROM, EEPROW, a watch-dog circuit, a serial communication interface, a driver, an inlet quantity interface circuit, a liquid crystal display device, an indicator light, a keyboard and an outlet quantity drive circuit. The utility model has the advantages of no peripheral subsidiary device, low cost, simple structure, convenient adjustment and reliable operation, and can rapidly satisfy the requirement of relay protection for a middle or low voltage electric network.
Description
One, technical field
The utility model relates to power system relay protection device, is specifically related to be applicable to the short-term road fibre-optic current longitudinal difference protection of the following middle low-pressure system of 110kV.
Two, background technology
Compare with traditional current protection or distance protection, transmission line current differential protection alternative route two lateral current magnitudes, have exempt load current influence, non-response system oscillation, selectivity is good and advantage such as sensitivity height.Compare with other data channel, optical-fibre channel has that anti-electromagnetic interference capability is strong, the error rate is low, the advantage of working stability.Therefore, along with the maturation of optical-fibre channel technology, optical fiber differential protective is used widely on the grid power transmission circuit.
The high-tension line optical-fiber longitudinal difference protection is realized the synchronized sampling of circuit both sides protective device by the high-speed data communication interface at present, because employing synchronous communication mode and transmitted data amount are big, causes the peripheral auxiliary circuits complexity of protective device and cost very high.Above-mentioned reason has limited the application of optical fiber differential protective on the mesolow short haul circuits.
Three, utility model content
For promoting the application of optical fiber differential protective at middle low-pressure system; the fibre-optic current longitudinal difference protection of the following middle low-pressure system short haul circuits of a kind of 110kV of being applicable to is provided; need not complicated peripheral auxiliary equipment; with low cost, principle is simple, debugging is convenient, reliable, can rapidity satisfies the protective device of the requirement of mesolow electric grid relay protection.
This mesolow short-term road equipment for protecting optical fibre longitudinal difference uses on protected circuit in pairs, and an end is the Host Protection device, and the other end is from protector, adopts optical fiber to be connected with each other between the two.The on-the-spot AC signal that protective device is gathered is through auxiliary converter; low pass filter is to the analog to digital converter that links to each other with data processing module; by CPU; random asccess memory; read-only memory interconnect and the output of the data processing module formed by interface respectively with LCD; indicator light; keyboard links to each other; driver links to each other with CPU by serial data interface; CPU also links to each other with opening into the amount interface circuit with watchdog circuit respectively, and by the amount of leaving drive circuit respectively with the tripping operation exit relay; the trip signal relay; the alarm signal relay; installing unusual relay links to each other.
Four, description of drawings
Fig. 1 is a mesolow short-term road equipment for protecting optical fibre longitudinal difference composition frame chart.
Fig. 2 is the connection diagram of protective device of the present utility model on protected circuit.
Five, embodiment
This device uses on protected circuit in pairs, with GF (light is sent out), GS (light receipts) terminal of optical fiber connection protective device, as shown in Figure 2.Require to adopt multimode fiber, the optical fiber splice mode is the ST type.Communication mode is asynchronous communication, and transmission rate is 9600bps.The recommended line distance is less than 3 kilometers.
Different to offside transmission three-phase current sampled value with the high-tension line optical-fiber longitudinal difference protection, optical-fiber longitudinal difference protection is that electric current is comprehensively measured to the data of offside transmission in this device, so the data volume that the circuit both sides need exchange obtains compressing, and has alleviated the burden of optical fiber communication.Electric current is comprehensively measured I
∑=I
1+ 6I
2, I wherein
1Be forward-order current, I
2Be negative-sequence current.
The hardware block diagram of protective device as shown in Figure 1, primary processor adopts 32 high-performance CPU, hardware circuit comprises data acquisition module, data processing module, switching value input/output module and communication interface.The task of data acquisition module is that on-the-spot AC signal is converted to required digital quantity, comprises auxiliary converter, low pass filter and analog to digital converter etc.Data processing module is the CPU main system, and analyzing and processing is carried out in the output of data acquisition module, finishes the relaying protection function, comprises CPU, read-only memory (EPROM and EEPROM), random access memory ram etc.The switching value input/output module is finished functions such as protection outlet tripping operation, signal demonstration, warning.The communication interface of device comprises 1 CAN bus mouth (omitting among Fig. 2) and 1 serial port, and wherein CAN bus mouth is used for the constructing communication network of electric substation automation system, and serial port RS-232 links to each other with optical fiber interface after the SN75451 chip drives.
Protective device is main frame by adjusting the synchronized sampling that sampling instant realizes the both sides protective device with an end, and the other end is a slave, and it is synchronous with main frame that the clock of slave keeps.Behind the device electrification reset; slave is sent out a frame synchronization message and is preserved delivery time; after main frame is received synch command; through time-delay synchronizing information is returned; slave utilizes the actual reception moment and the difference of synchronous regime between the following time of reception that the sampling instant of oneself is adjusted, thereby realizes the sample-synchronous of circuit both sides protective device.
The both sides protective device is realized beginning exchanges data after the sample-synchronous.Protective device is deposited in the transmission buffering area with ready side data, per 5 milliseconds of transmissions once, the data that send buffering area refresh once for per 10 or 20 milliseconds.The data that receive offside are finished in interruption.
Adopt the CRC check method in the communication process, earlier all state corresponding check sign indicating numbers are obtained, make checklist and be stored among the EPROM, obtain the CRC check sign indicating number of data by look-up table, real-time is greatly improved.
Though the protective device of circuit both sides has been realized sample-synchronous through synchronous adjustment process, owing to the both sides crystal oscillator, adjust factors such as error and program running difference separately at first and cause to lose synchronously both sides after a period of time.The sampling markers that protective device utilizes the data exchange process frame information to be comprised monitors synchronously, utilize the Theoretical Calculation markers and actual time target difference judge whether that both sides lose synchronously, if lose synchronously then protective device restart synchronously to the time process.
Claims (1)
1; a kind of mesolow short-term road equipment for protecting optical fibre longitudinal difference; it is characterized in that: be included on the protected circuit adopt a pair of Host Protection device that optical fiber couples together with from protector; it is main; the on-the-spot AC signal of gathering from protective device is through auxiliary converter; low pass filter is to the analog to digital converter that links to each other with data processing module; by CPU; random asccess memory; read-only memory interconnect and the output of the data processing module formed by interface respectively with LCD; indicator light; keyboard links to each other; driver links to each other with CPU by serial data interface; CPU also links to each other with opening into the amount interface circuit with watchdog circuit respectively, and by the amount of leaving drive circuit respectively with the tripping operation exit relay; the trip signal relay; the alarm signal relay; installing unusual relay links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520074456 CN2826788Y (en) | 2005-08-15 | 2005-08-15 | Middle/low pressure short circuit optical fibre differential protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520074456 CN2826788Y (en) | 2005-08-15 | 2005-08-15 | Middle/low pressure short circuit optical fibre differential protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2826788Y true CN2826788Y (en) | 2006-10-11 |
Family
ID=37066971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520074456 Expired - Fee Related CN2826788Y (en) | 2005-08-15 | 2005-08-15 | Middle/low pressure short circuit optical fibre differential protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2826788Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464479C (en) * | 2006-12-12 | 2009-02-25 | 赵建青 | Electric grid system and method for resolving electric grid large area power cut |
| CN101159373B (en) * | 2007-04-23 | 2010-05-19 | 国电南京自动化股份有限公司 | Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process |
| CN102364799A (en) * | 2011-11-07 | 2012-02-29 | 四川省电力公司遂宁公司 | Differential protection system for power system substation |
| CN101296062B (en) * | 2007-04-28 | 2012-04-11 | 许继集团有限公司 | Double-channel data transmission method in optical fiber longitudinal differential protection |
| CN108512204A (en) * | 2018-06-07 | 2018-09-07 | 广东科瑞德电气科技有限公司 | A kind of power grid differential protection |
-
2005
- 2005-08-15 CN CN 200520074456 patent/CN2826788Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464479C (en) * | 2006-12-12 | 2009-02-25 | 赵建青 | Electric grid system and method for resolving electric grid large area power cut |
| CN101159373B (en) * | 2007-04-23 | 2010-05-19 | 国电南京自动化股份有限公司 | Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process |
| CN101296062B (en) * | 2007-04-28 | 2012-04-11 | 许继集团有限公司 | Double-channel data transmission method in optical fiber longitudinal differential protection |
| CN102364799A (en) * | 2011-11-07 | 2012-02-29 | 四川省电力公司遂宁公司 | Differential protection system for power system substation |
| CN108512204A (en) * | 2018-06-07 | 2018-09-07 | 广东科瑞德电气科技有限公司 | A kind of power grid differential protection |
| CN108512204B (en) * | 2018-06-07 | 2024-11-01 | 广东科瑞德电气科技有限公司 | Differential protection device for power grid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| ASS | Succession or assignment of patent right |
Owner name: GUODIAN NANNUI TECH CO., LTD. Free format text: FORMER OWNER: NANJING NANRUI GROUP CO.,LTD. Effective date: 20091120 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091120 Address after: High road Nanjing high tech Development Zone of Jiangsu City, No. 20, zip code: 210061 Patentee after: NARI Technology Development Co., Ltd. Address before: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Patentee before: Nanjing Nari Co., Ltd. |