CN102916394A - On-site transformer protection system used for intelligent transformer substation - Google Patents
On-site transformer protection system used for intelligent transformer substation Download PDFInfo
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- CN102916394A CN102916394A CN2011104407051A CN201110440705A CN102916394A CN 102916394 A CN102916394 A CN 102916394A CN 2011104407051 A CN2011104407051 A CN 2011104407051A CN 201110440705 A CN201110440705 A CN 201110440705A CN 102916394 A CN102916394 A CN 102916394A
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- 238000005070 sampling Methods 0.000 description 10
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Abstract
The invention relates to an on-site transformer protection system used for an intelligent transformer substation. As for the transformer protection, the traditional transformer protection is characterized in that the analog quantity and the switching quantity of sides are introduced into the transformer protection device by a long cable to be concentrated and stored when the analog quantity and the switching quantity of sides of a transformer are required to be acquired. According to the on-site transformer protection system, a main control chamber is omitted, and the on-site transformer protection system can protect on-site devices, utilize communication network techniques, provide a corresponding network data transmission scheme, and artfully solve key technical problems of an on-site installed transformer protection realizing scheme. By virtue of redundant design, the on-site transformer protection system can send out warning information, and meanwhile maintain and protect the normal operation through the self-healing of a network switching technique after communication network faults are identified, so that the problem that the reliable operation of the transformer protection system is influenced by the communication network faults can be solved.
Description
Technical field
The invention belongs to the relaying protection automatic field in power engineering field, relate to the method for designing of the site tranformer protection of intelligent substation.
Background technology
In traditional transformer station; the traditional transformer protection is incorporated into each side analog quantity of transformer (electric current and voltage) and switching value in the protection equipment for transformer by long cable; finish analog quantity to the conversion of digital quantity by protection equipment for transformer, and carry out logic discrimination.
The problem that this way is brought has:
1, floor space is large.Need to build master-control room and place protection equipment for transformer, taken a large amount of soils, in the situation of land resource growing tension, the investment that takies is also increasing.
2, protection reliability is subjected to the impact of secondary cable.In the conventional substation, because secondary cable suffers electromagnetic interference and primary equipment transmission overvoltage to cause the secondary device operation exception easily.In addition, the interference of the multipoint earthing of secondary circuit and coupling capacitance also may cause the protective relaying device misoperation.According to the statistics of State Grid control centre, the protection incorrect operation that causes because of the secondary cable problem accounts for 4 one-tenth of fault sum, and in fact secondary cable has consisted of the main hidden danger of substation safety operation.
Summary of the invention
The problem to be solved in the present invention is to realize the site design of tranformer protection, satisfies the demand for development of intelligent substation.
For finishing above-mentioned task, technical scheme of the present invention is: the site tranformer protection system that is used for intelligent substation, the equal correspondence of each side of transformer is provided with logical block, and each logical block is corresponding being placed in the switch cubicle of each side respectively, is connected to each other by optical fiber between each logical block; Each logical block is respectively applied to finish the function of a data acquisition, data interaction and the backup protection logic discrimination of respective side.
Each side of described transformer comprises the high-pressure side, medium voltage side and low-pressure side.
The invention belongs to the intelligent substation relaying protection automatic field in power engineering field, relate to the tranformer protection method for designing of site in the intelligent substation.In intelligent substation, it is the trend of development that cancellation master-control room, protection site are placed.For tranformer protection, owing to need to gather analog quantity and the switching value of each side of transformer, tranformer protection traditionally is incorporated into analog quantity and the switching value of each side in the protection equipment for transformer of concentrating placement by long cable.This implementation method can not be applied in the intelligent substation.Therefore, must for the Liquified gas tanker of intelligent substation, corresponding tranformer protection design be proposed.
The present invention utilizes communication network technique, has proposed corresponding network data transmission scheme, has solved cleverly the key technical problem of the tranformer protection implementation of site installation.And by Redundancy Design, after identifying the communication network fault, when sending warning information, can pass through the self-healing of network handoff technique, and keep the normal operation of protection, solved the problem of communication network fault effects tranformer protection reliability service.Utilize network communications technology, realized that the site of tranformer protection is placed, and solved dexterously data synchronization problems by software algorithm, do not rely on outside lock-out pulse.Simultaneously, by redundant technique, solved the problem that communication link failure causes system to be blocked, effectively improved the reliability of differential protection, using value is high.
Description of drawings
Fig. 1 is site tranformer protection logical block allocation plan;
Fig. 2 is site tranformer protection logical block optical-fibre channel connection layout;
Fig. 3 adjusts to calculate schematic diagram synchronously.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
Along with the IEC-61850 standard is promulgated, the development of the network communications technology, the construction of intelligent substation is more and more faster.In intelligent substation, it is the trend of development that collecting unit is transferred.After collecting unit was transferred, difference, sampling crystal oscillator deviation and data sent, the transmission time difference of reception owing to device powers on constantly, must cause the difference of sampling instant.Correctness for guaranteeing that differential protection calculates must guarantee that the sampled data of respectively holding electric parameters of calculating is synchronous.Synchronous for the sampled data that realizes each side, adoptable method has:
1, each device access outside to the time signal, such as GPS pulse or B code, device take the outside to the time signal be benchmark, sampled data is stamped markers, realize that the data of each device are synchronous, satisfy the requirement of tranformer protection.
2, each device do not access outside to the time signal, adopt specific software algorithms, realize that the data of each device are synchronous, satisfy the requirement of tranformer protection.
Software algorithm adopts the isosceles trapezoid algorithm that generally adopts at present.
The isosceles trapezoid algorithm principle:
Calculate on the Mathematical Modeling that all is based upon transceiving data time-delay equal " isosceles trapezoid algorithm " based on the synchronous adjustment of digital channel.As shown in Figure 3:
In this figure isosceles trapezoid, if from the upper base of side known trapezoidal and the length of going to the bottom, use geometric knowledge to try to achieve easily the master Frame and send some T
M1Corresponding with moment point T from side
M1' constantly.That is to say target relation when just knowing offside Frame transmitting time and this side from side by simple computation.
Concrete processing procedure is as follows: every side protective device need be remembered following content: Δ t blanking time of the moment that sent data last time and the nearest time of reception
2=t
2-T
M0, Δ t
1=t
1-T
N2, and with T
N0, Δ t
2Utilize digital channel to pass over, the transmission data break is the set time, is made as T (this installs every cycle 24 points of sampling, and each sampling period sends frame data to offside), then at the t from side
1Constantly can obtain the side data delivery time
T
m1′＝[(T
n2-T
n0+Δt
1)+(T-Δt
2)]/2 (1)
Channel transfer time-delay t
dComputing formula as follows:
t
d＝[(T
n2-T
n0+Δt
1)-(T-Δt
2)]/2 (2)
From side and master sampling instant deviation delta t s
A=(T
N2-T
M1')/T remainder number (3)
If a＜T/2, then Δ ts gets a; Then from end hysteresis main side | Δ ts|; If a＞T/2, Δ ts get-| T-a|, then from holding leading main side | Δ ts|; According to the sampling instant deviation from side and master | Δ ts|, make corresponding adjustment from side, can reach the purpose of synchronized sampling.
The computing formula of the poor Δ Num of both sides sampling sequence number is as follows:
Δ Num=offside sampling sequence number-[this side sampling sequence number-round ((t
d-Δ t
1)/T+0.5)] (4)
The site tranformer protection system that is used for intelligent substation as shown in Figure 1, the equal correspondence of each side of transformer is provided with logical block, and each logical block is corresponding being placed in the switch cubicle of each side respectively, is connected to each other by optical fiber between each logical block; Each logical block is respectively applied to finish the function of a data acquisition, data interaction and the backup protection logic discrimination of respective side.Take three coil transformers as example, the component units of tranformer protection has: high-pressure side logical block, medium voltage side logical block and low-pressure side logical block.Each logical block is finished respectively a data acquisition, the data interaction of respective side, the function of backup protection logic discrimination.Differential protection is finished by one of them logical block.The protection high-pressure side, medium voltage side, the synchronous reference side of order adaptive setting data of low-pressure side.At communication link all in the normal situation, to carry out data synchronous as benchmark take the high-pressure side.In the situation of reference side and other certain side communication link fails, the punctual function by each logical block guarantees the synchronous of data in short-term, automatically changes afterwards reference side, and it is synchronous that system re-starts data.Continue to send out a channel alarm signal, remind operations staff's selection interruption maintenance of selecting a good opportunity.
The high-pressure side logical block is finished the high-pressure side data acquisition, high-pressure side circuit breaker trip, differential protection, the functions such as high-pressure side backup protection.
The medium voltage side logical block is finished the medium voltage side data acquisition, medium voltage side circuit breaker trip, the functions such as medium voltage side backup protection.
The low-pressure side protective device is finished the low-pressure side data acquisition, low-pressure side circuit breaker trip, the functions such as low-pressure side backup protection.
Each logical block directly connects in twos by optical fiber.
Therefore transformer differential protection needs each side electric current to realize sample-synchronous owing to calculate the vector sum of each side electric current.The protection equipment for transformer of patent of the present invention, do not access outside to the time signal, adopt trapezoidal software algorithm, realize that the data of each device are synchronous, satisfy the requirement of transformer differential protection.
System is according to the high-pressure side, and the order of medium voltage side and low-pressure side arranges reference side.At communication link all in the normal situation, to carry out data synchronous as benchmark take the high-pressure side.In the situation of reference side and a certain communication link fault of other sides; system relies on the punctual function of the clock chip of each logical block; the differential protection data of keeping are in short-term calculated; concurrent channel abnormal alarm signal; simultaneously automatically changing other sides is reference side, and it is synchronous that system re-starts data.
For the standby protection in each rear flank of transformer (comprising the high-pressure side backup protection, medium voltage side backup protection and low-pressure side backup protection), this side electric current and voltage are measured in simulation, do not have each side data stationary problem.Therefore, the standby protection in each rear flank of this programme drops into all the time, is not subjected to the impact of communication link.
Each side logical block of transformer is positioned in each side switch cubicle of transformer on the spot, and each side logical block is all carried out communication by optical fiber.
The high-pressure side logical block is finished the high-pressure side data acquisition, high-pressure side circuit breaker trip, differential protection, the functions such as high-pressure side backup protection.The medium voltage side logical block is finished the medium voltage side data acquisition, medium voltage side circuit breaker trip, the functions such as medium voltage side backup protection.The low-pressure side logical block is finished the low-pressure side data acquisition, low-pressure side circuit breaker trip, the functions such as low-pressure side backup protection.
For the standby protection in each rear flank, each side logical block is independently differentiated, and it is synchronous not rely on data.
For differential protection, it is synchronous that the calculating of differential current need to be carried out data.
Present design can also realize that synchrodata is redundant except realizing that each logical block data synchronously, guarantee that any one communication link damages, and system does not withdraw from differential protection.The step that realizes is:
(1) order that reference side is set is H side (being the high-pressure side), M side (being medium voltage side), L side (being low-pressure side).
When (2) whether system's detection communication link of detecting H side and other both sides (M side and L side) was normal, system was automatically take the H side as synchronous base, and M side and L side are adjusted sampled data, realize system data synchronization.
(3) system detects any a-road-through news link of H side and other sides when unusual, whether whether then detect in order the M side normal with the communication link of other both sides (H side and L side), if normal, then system realizes system data synchronization take the M side as benchmark.
(3) system detects the H side and the M side is all unusual with other side communication links, and then system realizes system data synchronization take the L side as benchmark.
(4) system detects H side, M side and L side and all has the unusual situation of communication link, and the expression system has at least the two-way communication link unusual, then Blocking Differential Protection.
Tranformer protection traditionally is incorporated into analog quantity and the switching value of each side in the protection equipment for transformer of concentrating placement by long cable.This implementation is not only built master-control room because of needs and is placed protective device, takies a large amount of soils, and two vice-minister's cables also threaten the normal reliable operation of protection.Patent of the present invention is complied with the development need of intelligent substation, has realized the site of transformer, and has solved dexterously data synchronization problems and the integrity problem of differential protection, has innovation and creation.
Above embodiment is the unrestricted technical method of the present invention in order to explanation only, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: the present invention is made amendment or is equal to replacement, and do not break away from any modification or partial replacement of the spirit and scope of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. be used for the site tranformer protection system of intelligent substation, it is characterized in that the equal correspondence of each side of transformer is provided with logical block, each logical block is corresponding being placed in the switch cubicle of each side respectively, is connected to each other by optical fiber between each logical block; Each logical block is respectively applied to finish the function of a data acquisition, data interaction and the backup protection logic discrimination of respective side.
2. the site tranformer protection system for intelligent substation according to claim 1 is characterized in that each side of described transformer comprises the high-pressure side, medium voltage side and low-pressure side.
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| CN201110440705.1A CN102916394B (en) | 2011-12-24 | 2011-12-24 | On-site transformer protection system used for intelligent transformer substation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393567A (en) * | 2014-11-20 | 2015-03-04 | 许继集团有限公司 | Differential protection method for distributed transformer |
| CN104538933A (en) * | 2015-01-14 | 2015-04-22 | 南京南瑞继保电气有限公司 | Motor differential protection system and motor differential protection method |
| CN105301989A (en) * | 2014-06-19 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Self compensation type pilot protection exchange synchronization controller based on mobile communication |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
| CN109768533A (en) * | 2018-12-28 | 2019-05-17 | 长园深瑞继保自动化有限公司 | The method of the more handset synchronization actions of site element protection looped network |
| CN110505259A (en) * | 2018-05-17 | 2019-11-26 | 许昌许继软件技术有限公司 | A kind of data processing method and device of intelligent substation |
| CN111564821A (en) * | 2020-04-17 | 2020-08-21 | 许昌许继软件技术有限公司 | Automatic configuration method of on-site management unit |
| CN112993949A (en) * | 2021-02-26 | 2021-06-18 | 许继集团有限公司 | Synchronization method and device for power transmission line longitudinal differential protection sampling |
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| US20050096772A1 (en) * | 2003-10-31 | 2005-05-05 | Cox David N. | Transformer performance prediction |
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2011
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| US20050096772A1 (en) * | 2003-10-31 | 2005-05-05 | Cox David N. | Transformer performance prediction |
| CN102025126A (en) * | 2011-01-19 | 2011-04-20 | 广东省电力设计研究院 | Relay protection method of transformer as well as system thereof |
Non-Patent Citations (1)
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| 刘有为等: "高压设备智能化方案及技术特征", 《电网技术》, vol. 34, no. 7, 31 July 2010 (2010-07-31), pages 1 - 4 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301989A (en) * | 2014-06-19 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Self compensation type pilot protection exchange synchronization controller based on mobile communication |
| CN105301989B (en) * | 2014-06-19 | 2018-03-02 | 国网山西省电力公司电力科学研究院 | Self-compensating formula pilot protection based on mobile communication exchanges isochronous controller |
| CN104393567A (en) * | 2014-11-20 | 2015-03-04 | 许继集团有限公司 | Differential protection method for distributed transformer |
| CN104393567B (en) * | 2014-11-20 | 2017-08-29 | 许继集团有限公司 | A kind of distribution transformer differential protecting method |
| CN104538933A (en) * | 2015-01-14 | 2015-04-22 | 南京南瑞继保电气有限公司 | Motor differential protection system and motor differential protection method |
| CN104538933B (en) * | 2015-01-14 | 2018-03-13 | 南京南瑞继保电气有限公司 | A kind of motor differential protective system and method |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
| CN110505259A (en) * | 2018-05-17 | 2019-11-26 | 许昌许继软件技术有限公司 | A kind of data processing method and device of intelligent substation |
| CN109768533A (en) * | 2018-12-28 | 2019-05-17 | 长园深瑞继保自动化有限公司 | The method of the more handset synchronization actions of site element protection looped network |
| CN111564821A (en) * | 2020-04-17 | 2020-08-21 | 许昌许继软件技术有限公司 | Automatic configuration method of on-site management unit |
| CN112993949A (en) * | 2021-02-26 | 2021-06-18 | 许继集团有限公司 | Synchronization method and device for power transmission line longitudinal differential protection sampling |
| CN112993949B (en) * | 2021-02-26 | 2023-11-14 | 许继集团有限公司 | Synchronization method and device for longitudinal differential protection sampling of power transmission line |
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| CN102916394B (en) | 2015-07-15 |
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