CN104810810A - Method and device for longitudinal differential protection of power transmission line - Google Patents
Method and device for longitudinal differential protection of power transmission line Download PDFInfo
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- CN104810810A CN104810810A CN201510254757.8A CN201510254757A CN104810810A CN 104810810 A CN104810810 A CN 104810810A CN 201510254757 A CN201510254757 A CN 201510254757A CN 104810810 A CN104810810 A CN 104810810A
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Abstract
The invention relates to the field of power transmission and provides a method and a device for longitudinal differential protection of a power transmission line. The power transmission line comprises a power supply side and a load side which are electrically connected with each other through the line. The device comprises a first collection device, a second connection device and a differential protection measuring and controlling device, wherein the first collection device comprises a first mutual inductor set and a first combination unit. The method comprises the following steps: receiving electric quantity information of the load side sent by the first combination unit and electric quantity information sent by the second collection device; judging whether the line between the power supply side and the load side has a fault according to the electric quantity information of the two sides; cutting off the electric connection between the power supply side and the load side by the differential protection measuring and controlling device if the line has the failures. By virtue of the method and the device, one differential protection measuring and controlling device can be used for judging whether the line between the power supply side and the load side has the failures; the number of the existing devices and the method steps are reduced; the stability and the reliability in working of the power transmission line are improved.
Description
Technical field
The present invention relates to power delivery technical field, in particular to a kind of method and device of longitudinal differential protection of transmission line.
Background technology
The pilot protection of so-called power transmission line; with certain communication port, the protective device at power transmission line two ends is longitudinally tied exactly; the electric parameters (direction etc. of electric current, power) of each end is sent to opposite end; the electric parameters at two ends is compared; with failure judgement in this line range or outside line range, thus determine whether cut off protected circuit.Therefore, this pilot protection has absolute selectivity in theory.
Differential protection is the protective device to electric equipment that a kind of change according to protected electric equipment line two ends current differential is formed, and is generally divided into longitudinal differential protection and transverse differential protection.The differential protection of transformer belongs to longitudinal differential protection, and transverse differential protection is then usually used in the protection of the equipment such as substation busbars.
When transmission line breaks down; fault current flows to fault point from mains side; circuit as receiving end does not have short circuit current to flow to fault point; the protection of receiving end just has no idea to start; cause the tripping of mains side longitudinal differential protection, although can adopt the protection seting of receiving end is weak feedback mode, it is from principle still needing send triggering signal to mains side; so there is hidden danger in the longitudinal differential protection of existing transmission line, poor reliability.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and device of longitudinal differential protection of transmission line, the method and device decrease the link of existing longitudinal differential protection, improve the reliability of the longitudinal differential protection of transmission line.
The present invention is achieved in that
First aspect, embodiments provide a kind of method of longitudinal differential protection of transmission line, be applied to the device of the longitudinal differential protection of transmission line, described transmission line comprises the mains side and load side that are electrically connected to each other by circuit, described device comprises the first harvester, for gathering the second harvester of the electric quantity information of described mains side and being arranged at the differential protection measure and control device of described mains side, described first harvester comprises the first instrument transformer group of the electric quantity information for gathering described load side and the first merge cells for the electric quantity information that sends load side, described method comprises:
Described differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission;
According to the electric quantity information of the electric quantity information of described load side and described mains side, described differential protection measure and control device judges whether the circuit between described mains side and described load side exists fault; If there is fault,
Then described differential protection measure and control device disconnects the electrical connection of described mains side and described load side.
In conjunction with first aspect; embodiments provide the first possible execution mode of first aspect; the device of wherein said longitudinal differential protection also comprises circuit breaker; described mains side is connected by described circuit breaker with described load side; the contiguous described mains side of described circuit breaker; described differential protection measure and control device disconnects the electrical connection of described mains side and described load side, comprising:
Described differential protection measure and control device controls described circuit breaker and disconnects, so that the connection of described mains side and described load side disconnects.
When differential protection measure and control device detects that the circuit between mains side and load side exists fault, differential protection measure and control device controls circuit breaker and disconnects, and realizes mains side and load side disconnection.
In conjunction with first aspect, embodiments provide the execution mode that the second of first aspect is possible, wherein said method also comprises:
If there is not fault,
Described differential protection measure and control device is after Preset Time; again receive the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission, again to judge whether the circuit between described mains side and described load side exists fault.
Differential protection measure and control device just judges whether the circuit between mains side and load side exists fault, improves the stability of Research Work of Power Transmission Line every Preset Time.
In conjunction with the execution mode that the second of first aspect is possible; embodiments provide the third possible execution mode of first aspect; wherein said differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission, comprising:
Described differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission by optical fiber.
Fiber transmission speeds is fast, flow is large, anti-interference is good, can be improved the reliability of the device of the longitudinal differential protection of transmission line by Optical Fiber Transmission electric quantity information.
Second aspect, the embodiment of the present invention additionally provides a kind of device of longitudinal differential protection of transmission line, described transmission line comprises the mains side and load side that are electrically connected to each other by circuit, described device comprises the first harvester, for gathering the second harvester of the electric quantity information of described mains side and being arranged at the differential protection measure and control device of described mains side, described first harvester comprises the first instrument transformer group of the electric quantity information for gathering described load side and the first merge cells for the electric quantity information that sends load side; Described differential protection measure and control device connects described first merge cells and described second harvester, and described differential protection measure and control device is also connected with the circuit breaker of the connection for mains side described in on/off and described load side.
In conjunction with second aspect, embodiments provide the first possible execution mode of second aspect, wherein said first instrument transformer group comprises current transformer and voltage transformer.
The current transformer that first instrument transformer group comprises and voltage transformer all gather analog quantity, and the analog quantity collected is sent to the first merge cells, so that subsequent treatment.
In conjunction with second aspect; embodiments provide the execution mode that the second of second aspect is possible; wherein said mains side is intelligent substation; described second harvester comprises the second instrument transformer group of the electric quantity information for gathering described intelligent substation and the second merge cells for the electric quantity information that sends mains side, and described second instrument transformer group connects described differential protection measure and control device by described second merge cells.
Intelligent substation requires that the amount of input is digital signal, so the analog quantity of the second instrument transformer group collection needs through the second merge cells conversion.
In conjunction with second aspect; embodiments provide the third possible execution mode of second aspect; wherein said mains side is conventional substation; described second harvester comprises the 3rd instrument transformer group of the electric quantity information for gathering described conventional substation, and described 3rd instrument transformer group connects described differential protection measure and control device.
Conventional substation can be analog input, so the analog quantity of the 3rd instrument transformer group collection is directly transferred to differential protection measure and control device, eliminates intermediate link, improves reliability.
In conjunction with the second or the third possible execution mode of second aspect, embodiments provide the 4th kind of possible execution mode of second aspect, wherein said differential protection measure and control device is by load side described in Fiber connection.
In conjunction with the third possible execution mode of second aspect, embodiments provide the 5th kind of possible execution mode of second aspect, wherein said 3rd instrument transformer group comprises current transformer and voltage transformer.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Embodiments provide a kind of method and device of longitudinal differential protection of transmission line; the method and device adopt a differential protection measure and control device being arranged at mains side just can judge whether the circuit between mains side and load side exists fault; simplify existing longitudinal differential protection device; also simplify the method for existing longitudinal differential protection; thus decrease intermediate link; reduce the probability broken down, improve stability and the reliability of Research Work of Power Transmission Line.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the flow process of the method for the longitudinal differential protection of a kind of transmission line that the embodiment of the present invention provides;
Fig. 2 shows the flow process of the method for the longitudinal differential protection of the another kind of transmission line that the embodiment of the present invention provides;
Fig. 3 shows the structure of the device of the longitudinal differential protection of a kind of transmission line that the embodiment of the present invention provides;
Fig. 4 shows a kind of structure being applied to the device of the longitudinal differential protection of the transmission line of intelligent substation that the embodiment of the present invention provides;
Fig. 5 shows a kind of structure being applied to the device of the longitudinal differential protection of the transmission line of conventional substation that the embodiment of the present invention provides.
Mark in figure: differential protection measure and control device 301, mains side 302, load side 303, the first harvester 304; second harvester 305, first instrument transformer group 306, first merge cells 307, circuit breaker 308; second instrument transformer group 309, second merge cells the 310, three instrument transformer group 311.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Transformer station, changes the place of voltage.In order to the power delivery that power plant is sent is to place far away, voltage must be raised, become high-tension electricity, on demand voltage be reduced near user again, the work of this buck/boost has come by transformer station.The capital equipment of transformer station is switch and transformer.
Intelligent substation refers to and adopts intelligentized primary equipment; with transformer station first and second equipment for digitlization object; based on express network platform; by carrying out standardization to digital information; realize the inside and outside information sharing in station and interoperability; and based on network data, realize the modernization transformer station of measuring the automation functions such as supervision, Control protection, information management.Its control system process be digital quantity.Conventional substation is corresponding with intelligent substation, in general refers to the transformer station not adopting photoelectric current transformer, adopt traditional instrument transformer and secondary device.
In order to make transformer station and transmission line normally work, be generally provided with the device of differential protection at transmission line.The device of existing differential protection is the electric quantity information gathering mains side and load side, and sends to offside.After the electric quantity information receiving offside transmission compared with the electric quantity information of this side, when both sides exist difference stream, be judged as fault, cut-off breaker, realize the disconnection that mains side is connected with load side.The following condition of cut-off breaker demand fulfillment: 1, this side starting component starts; 2, this side difference element action; 3, the permission signal of offside " differential action " is received.Such as: when transmission line breaks down, mains side protection starts, and now receives the signal of " load side protection starts " that load side sends, so mains side cut-off breaker.After load side receives the signal of " mains side protection starts " that mains side sends, load side is cut-off breaker also.According to the principle of existing differential protection, the mains side of transmission line and load side must install the differential protection measure and control device of same model simultaneously, could meet the needs of information interaction.Also there are the following problems for existing differential protection: during transmission line malfunction; electric current flows to fault point from mains side; the circuit of load side does not have short circuit current to flow to fault point; the protection of load side just cannot start; thus the signal of " load side protection starts " cannot be sent to mains side, cause the tripping of mains side differential protection.Although can adopt, the protection of load side is set as weak feedback mode, it is from principle still needing send signal to mains side.In sum; when the differential protection of single ended power supply transmission line arranges two differential protection measure and control devices, the intermediate link of differential protection is more, and information interaction is handed over complicated; so just cause the reliability of existing differential protection not high, also make the cost of equipment higher simultaneously.
In order to improve the reliability of the differential protection of single ended power supply transmission line, reduce link between differential protection, reduce installation cost, embodiments provide a kind of method of longitudinal differential protection of transmission line, consult Fig. 1, the method of the longitudinal differential protection of transmission line is applied to the device of the longitudinal differential protection of transmission line, transmission line comprises the mains side and load side that are electrically connected to each other by circuit, device comprises the first harvester, for gathering the second harvester of the electric quantity information of mains side and being arranged at the differential protection measure and control device of mains side, first harvester comprises the first instrument transformer group of the electric quantity information for gathering load side and the first merge cells for the electric quantity information that sends load side, method comprises:
S101: differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that the first merge cells sends and the mains side of the second harvester transmission.
S102: according to the electric quantity information of load side and the electric quantity information of mains side, differential protection measure and control device judges whether the circuit between mains side and load side exists fault.If there is fault,
S103: the electrical connection of differential protection measure and control device deenergization side and load side.
First instrument transformer group gathers the electric quantity information of load side, and the electric quantity information collected is sent to differential protection measure and control device by the first merge cells.Second harvester gathers the electric quantity information of mains side, and is sent to differential protection measure and control device.Differential protection measure and control device receives the electric quantity information of both sides, judges whether both sides exist difference stream.When both sides exist difference stream, there is fault in the circuit namely between mains side and load side, the electrical connection of differential protection measure and control device deenergization side and load side, realizes the longitudinal differential protection of transmission line.
In order to improve the reliability of the differential protection of transmission line further, consult Fig. 2, embodiments provide the method for the longitudinal differential protection of another kind of transmission line, be applied to the device of the longitudinal differential protection of transmission line, transmission line comprises the mains side and load side that are electrically connected to each other by circuit, device comprises the first harvester, for gathering the second harvester of the electric quantity information of mains side and being arranged at the differential protection measure and control device of mains side, first harvester comprises the first instrument transformer group of the electric quantity information for gathering load side and the first merge cells for the electric quantity information that sends load side, method comprises:
S201: differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that the first merge cells sends and the mains side of the second harvester transmission.
S202: according to the electric quantity information of load side and the electric quantity information of mains side, differential protection measure and control device judges whether the circuit between mains side and load side exists fault.If there is fault,
S203: the electrical connection of differential protection measure and control device deenergization side and load side; The device of longitudinal differential protection also comprises circuit breaker, and differential protection measure and control device controls circuit breaker and disconnects, so that the connection of mains side and load side disconnects.
If there is not fault,
Differential protection measure and control device is after Preset Time; again perform step S201; namely the electric quantity information of the electric quantity information of the load side that the first merge cells sends and the mains side of the second harvester transmission is again received, again to judge whether the circuit between mains side and load side exists fault.
In order to make the transmission of electric quantity information more stable and quick, differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that the first merge cells sends and the mains side of the second harvester transmission by optical fiber.
Consult Fig. 3, the embodiment of the present invention provides a kind of device of longitudinal differential protection of transmission line, transmission line comprises interconnective mains side 302 and load side 303, device comprises the first harvester 304, comprise the first instrument transformer group 306 of the electric quantity information for gathering load side 303 and the first merge cells 307 for the electric quantity information that sends load side 303 for the second harvester 305 of gathering the electric quantity information of mains side 302 and differential protection measure and control device 301, first harvester 304 that is arranged at mains side 302; Differential protection measure and control device 301 connects the first merge cells 307 and the second harvester 305, and differential protection measure and control device 301 is also connected with the circuit breaker 308 of the connection for on/off mains side 302 and load side 303.
First instrument transformer group 306 gathers the electric quantity information of load side 303, and the electric quantity information collected is sent to differential protection measure and control device 301 by the first merge cells 307.Second harvester 305 gathers the electric quantity information of mains side 302, and is sent to differential protection measure and control device 301.Differential protection measure and control device 301 receives the electric quantity information of both sides, judges whether both sides exist difference stream.When both sides exist difference stream, and there is fault in the circuit between mains side 302 and load side 303, and differential protection measure and control device 301 controls circuit breaker 308 deenergization side 302 and the connection of load side 303, realizes the longitudinal differential protection of transmission line.
When mains side 302 is intelligent substation; consult Fig. 4; the embodiment of the present invention provides a kind of device of longitudinal differential protection of transmission line; the device of the longitudinal differential protection of this transmission line is except the structure shown in Fig. 3; second harvester 305 comprises the second merge cells 310 and the second instrument transformer group 309; wherein the second instrument transformer group 309 gathers the electric quantity information that intelligent substation exports; second merge cells 310 converts the electric quantity information of the analog quantity of collection to light signal; be sent to differential protection measure and control device 301, so that the judgement of consequent malfunction.
When mains side 302 is conventional substation; consult Fig. 5; the embodiment of the present invention provides a kind of device of longitudinal differential protection of transmission line, and the device of the longitudinal differential protection of this transmission line is except the structure shown in Fig. 3, and the second harvester 305 comprises the 3rd instrument transformer group 311.Input due to conventional substation can be analog quantity; so in order to cut down the number of intermediate links; the electric quantity information that the conventional substation collected exports is sent to differential protection measure and control device 301 by the 3rd instrument transformer group 311, so that the judgement of consequent malfunction, the electric quantity information of transmission is analog quantity.
First instrument transformer group 306, second instrument transformer group 309 and the 3rd instrument transformer group 311 include current transformer and voltage transformer.
Differential protection measure and control device 301 is by Fiber connection load side 303, and when mains side 302 is intelligent substation, differential protection measure and control device 301 is by Fiber connection second merge cells 310.
First merge cells 307 and the second merge cells 310 convert analog quantity to light signal, so that Optical Fiber Transmission.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for the longitudinal differential protection of a transmission line, it is characterized in that, be applied to the device of the longitudinal differential protection of transmission line, described transmission line comprises the mains side and load side that are electrically connected to each other by circuit, described device comprises the first harvester, for gathering the second harvester of the electric quantity information of described mains side and being arranged at the differential protection measure and control device of described mains side, described first harvester comprises the first instrument transformer group of the electric quantity information for gathering described load side and the first merge cells for the electric quantity information that sends described load side, described method comprises:
Described differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission;
Described differential protection measure and control device, according to the electric quantity information of the electric quantity information of described load side and described mains side, judges whether the circuit between described mains side and described load side exists fault; If there is fault,
Then described differential protection measure and control device disconnects the electrical connection of described mains side and described load side.
2. the method for the longitudinal differential protection of transmission line according to claim 1; it is characterized in that; the device of described longitudinal differential protection also comprises circuit breaker; described mains side is connected by described circuit breaker with described load side; the contiguous described mains side of described circuit breaker; described differential protection measure and control device disconnects the electrical connection of described mains side and described load side, comprising:
Described differential protection measure and control device controls described circuit breaker and disconnects, so that the connection of described mains side and described load side disconnects.
3. the method for the longitudinal differential protection of transmission line according to claim 1, is characterized in that, described method also comprises:
If there is not fault,
Described differential protection measure and control device is after Preset Time; again receive the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission, again to judge whether the circuit between described mains side and described load side exists fault.
4. the method for the longitudinal differential protection of transmission line according to claim 1; it is characterized in that; described differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission, comprising:
Described differential protection measure and control device receives the electric quantity information of the electric quantity information of the load side that described first merge cells sends and the mains side of described second harvester transmission by optical fiber.
5. the device of the longitudinal differential protection of a transmission line, it is characterized in that, described transmission line comprises the mains side and load side that are electrically connected to each other by circuit, described device comprises the first harvester, for gathering the second harvester of the electric quantity information of described mains side and being arranged at the differential protection measure and control device of described mains side, described first harvester comprises the first instrument transformer group of the electric quantity information for gathering described load side and the first merge cells for the electric quantity information that sends load side; Described differential protection measure and control device connects described first merge cells and described second harvester, and described differential protection measure and control device is also connected with the circuit breaker of the connection for mains side described in on/off and described load side.
6. the device of the longitudinal differential protection of transmission line according to claim 5, is characterized in that, described first instrument transformer group comprises current transformer and voltage transformer.
7. the device of the longitudinal differential protection of transmission line according to claim 5; it is characterized in that; described mains side is intelligent substation; described second harvester comprises the second instrument transformer group of the electric quantity information for gathering described intelligent substation and the second merge cells for the electric quantity information that sends mains side, and described second instrument transformer group connects described differential protection measure and control device by described second merge cells.
8. the device of the longitudinal differential protection of transmission line according to claim 5; it is characterized in that; described mains side is conventional substation; described second harvester comprises the 3rd instrument transformer group of the electric quantity information for gathering described conventional substation, and described 3rd instrument transformer group connects described differential protection measure and control device.
9. the device of the longitudinal differential protection of the transmission line according to claim 7 or 8, is characterized in that, described differential protection measure and control device is by load side described in Fiber connection.
10. the device of the longitudinal differential protection of transmission line according to claim 8, is characterized in that, described 3rd instrument transformer group comprises current transformer and voltage transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510254757.8A CN104810810A (en) | 2015-05-19 | 2015-05-19 | Method and device for longitudinal differential protection of power transmission line |
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| CN201510254757.8A CN104810810A (en) | 2015-05-19 | 2015-05-19 | Method and device for longitudinal differential protection of power transmission line |
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| CN201510254757.8A Pending CN104810810A (en) | 2015-05-19 | 2015-05-19 | Method and device for longitudinal differential protection of power transmission line |
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| CN105048425A (en) * | 2015-08-18 | 2015-11-11 | 李金宫 | Protection device and protection method of vehicle low-voltage power supply line |
| CN105226621A (en) * | 2015-11-03 | 2016-01-06 | 成都交大许继电气有限责任公司 | A kind of distribution type fiber-optic longitudinal difference protection system and method being applicable to high-speed railway |
| CN116014898A (en) * | 2023-01-09 | 2023-04-25 | 北京国科恒通科技股份有限公司 | Power distribution network protection system based on electricity consumption demand |
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| CN103293414A (en) * | 2013-05-21 | 2013-09-11 | 国家电网公司 | Intelligent substation protection device synchronization performance test system and method based on GPS (globe positioning system) accurate time synchronization technology |
| CN103326333A (en) * | 2013-05-24 | 2013-09-25 | 广东电网公司东莞供电局 | Asymmetric electric transmission line fault differential protection method and system |
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| CN102510051A (en) * | 2011-11-08 | 2012-06-20 | 许继集团有限公司 | Method for identifying failure of sampling value data of intelligent substation based on waveform coefficient equation |
| CN103293414A (en) * | 2013-05-21 | 2013-09-11 | 国家电网公司 | Intelligent substation protection device synchronization performance test system and method based on GPS (globe positioning system) accurate time synchronization technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105048425A (en) * | 2015-08-18 | 2015-11-11 | 李金宫 | Protection device and protection method of vehicle low-voltage power supply line |
| CN105226621A (en) * | 2015-11-03 | 2016-01-06 | 成都交大许继电气有限责任公司 | A kind of distribution type fiber-optic longitudinal difference protection system and method being applicable to high-speed railway |
| CN105226621B (en) * | 2015-11-03 | 2018-05-29 | 成都交大许继电气有限责任公司 | A kind of distribution type fiber-optic longitudinal difference protection system suitable for high-speed railway |
| CN116014898A (en) * | 2023-01-09 | 2023-04-25 | 北京国科恒通科技股份有限公司 | Power distribution network protection system based on electricity consumption demand |
| CN116014898B (en) * | 2023-01-09 | 2023-07-11 | 北京国科恒通科技股份有限公司 | Power distribution network protection system based on electricity consumption demand |
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