CN102684172B - Bus differential protection method for realizing sectional dead zone protection based on virtual bus - Google Patents
Bus differential protection method for realizing sectional dead zone protection based on virtual bus Download PDFInfo
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- CN102684172B CN102684172B CN201210166109.3A CN201210166109A CN102684172B CN 102684172 B CN102684172 B CN 102684172B CN 201210166109 A CN201210166109 A CN 201210166109A CN 102684172 B CN102684172 B CN 102684172B
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Abstract
The invention relates to a bus differential protection method for realizing sectional dead zone protection based on a virtual bus. The bus differential protection method comprises the following steps: independently arranging a bus differential protection device for each section of bus in a plurality of single bus sections; virtualizing the corresponding bus according to the position and the quantity of sectional switches connected with each section of bus; after the current equivalence of each sectional switch is taken, calculating into a side bus differential protection device logic; and when a dead zone in a sectional switch generation zone fails, jumping the sectional switch at the side and then sending out a command to jump a virtual bus sectional switch or borrowing a bus differential protection exit loop of a virtual bus self. The bus differential protection method has the benefits that due to the arrangement of the virtual bus, when the dead zone in the generation zone fails, a CT signal is not required to be alternately sealed by a side bus differential protection device and an opposite side bus differential protection device; the protection function of dead zone failure of the sectional switches is realized inside the side bus differential protection device through the virtual bus; and an external signal is not required to be connected, so that a connecting line between the side bus differential protection device and the opposite side bus differential protection device is reduced.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, relate to a kind of list female many section wirings mode by the bus differential protection method realizing segmentation dead zone protection in bus bar configuration bus differential protection situation based on virtual bus.
Background technology
Along with the development of electric power system, many for one-end substation low-voltage load outlet growing number, general employing single-busbar multi-segment wiring mode; And bus protection is limited to hardware resource (current circuit), the complete current differential protection to whole bus cannot be realized in a set of protective device.Current generic way is every section of a set of bus protection of bus bar configuration, needs to access respectively in two cover protection equipment for busbars for section breaker electric current; When there is segmentation dead-zone fault, the differential protection of two buses be connected with block switch is needed to cooperatively interact and could realize trip protection, isolated fault point.
For section breaker only in the situation of side installing CT, be dead-zone fault when fault point is between circuit breaker and CT; If CT is arranged near II female side, for I female protective device, belongs to troubles inside the sample space when block switch generation dead-zone fault, external area error is belonged to for II female protective device.In fact fault point cannot be isolated from system after I female protective device tripping operation, now I female protective device judges that section breaker is in and jumps position but sealing segmentation CT(segmented current through constant time lag after having stream is not counted in little difference); Envelope segmentation CT signal is needed to pass to II female protective device; after II female protective device receives this signal, the little poor calculating of this bus is not counted in segmentation difference stream; destroy II female difference mobile equilibrium, the adjacent circuit breaker that connects of II female protective device action tripping completes fault point from isolation of system.
For existing scheme, two cover protection equipment for busbars need to exchange envelope CT signal, and this deration of signal needs to ensure that another set of protection can complete protection and judge and tripping operation; One is the increase in line between protection screen; Two is increase the complexity of protection cooperation, is unfavorable for expansion and general.
Summary of the invention
The object of this invention is to provide a kind of bus differential protection method realizing segmentation dead zone protection based on virtual bus, overlap protection equipment for busbar and need exchange to solve existing method two problem that envelope CT signal brings.
For achieving the above object, the step realizing the bus differential protection method of segmentation dead zone protection based on virtual bus of the present invention is as follows:
(1) every section of bus in single-busbar multi-segment all independently arranges busbar differential protection device;
(2) every section of bus according on bus connect the position of block switch and quantity is carried out virtual to respective bus bars, fictionalize corresponding virtual bus;
(3) by after equivalent for the electric current of each block switch negate, this side bus differential protection logic is counted;
(4) when block switch generation dead-zone fault; and troubles inside the sample space is belonged to for this side bus differential protection; when external area error is belonged to for the virtual bus of its correspondence; jump this side block switch, then send instruction jump virtual busbar sectional izing switch or use the bus differential protection outlet loop of virtual bus itself.
Further, the realization of described step (3) has two kinds of modes: one is outside by the input terminal of segmented current reversed polarity access of virtual outlet; Two is the inputs of virtual outlet not outer portion, by after segmented current negate stored in virtual outlet corresponding stored district, described virtual outlet is connected with virtual bus, and the setting electric current of virtual outlet is contrary with segmented current amplitude identical polar.
The bus differential protection method realizing segmentation dead zone protection based on virtual bus of the present invention; during dead-zone fault in generating region; due to the setting of virtual bus; do not need this side, offside busbar differential protection device exchange envelope CT signal; by virtual bus at the defencive function of this side bus differential protection inside realization to the dead-zone fault of block switch; external signal is not needed to access; decrease the line between this side and offside busbar differential protection device, just can realize same bus differential protecting function.
Accompanying drawing explanation
Fig. 1 is segmentation dead-zone fault schematic diagram under single mother partition;
Fig. 2 is the system schematic that the virtual bus of the embodiment of the present invention is formed.
Embodiment
The bus differential protection method of segmentation dead zone protection is realized outside this section of bus of original protection based on virtual bus, another bus be connected with block switch is fictionalized according to the block switch that this bus connects, simultaneously using the electric current reversed polarity access of virtual bus of block switch as virtual outlet, so normal run time true bus and virtual bus on electric current be all balance; When there is dead-zone fault, assuming that segmentation CT is arranged near virtual bus bar side; When there is dead-zone fault, actual bus is judged to troubles inside the sample space, after section breaker correctly trips, virtual bus still provides short circuit current through segmentation CT to short dot, protection enters segmentation dead zone protection logic, segmented current is no longer counted two little differences of bus, thus destroy the current balance type of virtual bus, virtual bus action tripping operation; Require the voltage of access adjacent bus during use, during action, drive the relative breaker of jumping adjacent bus.
Be described the bus differential protection method realizing segmentation dead zone protection based on virtual bus below in conjunction with accompanying drawing, concrete steps are as follows:
(1) every section of bus in single-busbar multi-segment all independently arranges busbar differential protection device;
(2) every section of bus according on bus connect the position of block switch and quantity is carried out virtual to respective bus bars, fictionalize corresponding virtual bus, if the bus of segmentation is in two ends, the block switch be then connected with end bus is respectively one, the virtual bus of the block switch other end that the actual bus that now only need fictionalize end connects, if certain sectionalized bus is not be in end, what be then connected with this sectionalized bus has two block switches, now needs to fictionalize two virtual buses that two block switches that this sectionalized bus is connected are connected;
(3) by after equivalent for the electric current of each block switch negate, this side bus differential protection logic is counted; Can be realized by two kinds of modes: one is outside by the input terminal of segmented current reversed polarity access of virtual outlet; Two is the inputs of virtual outlet not outer portion, software inhouse by after segmented current negate stored in virtual outlet corresponding stored district;
(4) when block switch generation dead-zone fault, and troubles inside the sample space is belonged to for this side bus differential protection, when the virtual bus corresponding for this side bus belongs to external area error, jump this side block switch, then send instruction jump virtual busbar sectional izing switch or use the bus differential protection outlet loop of virtual bus itself, namely this side bus differential protection directly send instruction jump virtual busbar sectional izing switch or trip signal is directly issued the busbar differential protection device of virtual bus, this busbar differential protection device directly jumps its busbar sectional izing switch.
As shown in Figure 1, be segmentation dead-zone fault schematic diagram under single mother partition; Fig. 2 is the system schematic that the virtual bus of the present embodiment is formed.Just give the bus that a block switch connects in figure, be single female many segmentations during actual use, Method And Principle is identical.
Shown in Fig. 1, I mother is connected by a block switch with II mother, CT is provided with between block switch and II mother, and two buses all independently arrange busbar differential protection device, when adopting the bus differential protection method realizing segmentation dead zone protection based on virtual bus, first determine to need virtual bus (corresponding actual bus) according to I female concrete connection segment switch, namely the other end of I female connection segment switch is as shown in Figure 2 virtual bus, the actual bus that this virtual bus is corresponding is II mother, and the busbar differential protection device of I mother all need not be accessed for the connection original paper on wanted virtual bus i.e. II mother, this virtual bus only connects two elements: segmentation elements and virtual outlet, virtual outlet setting electric current is contrary with segmented current amplitude identical polar.
During normal operation, busbar differential protection device does single mother partition operation logic, and differential current computing and the operating criterion of virtual bus put into operation; Except generation segmentation dead-zone fault needs envelope segmentation CT, under this method, virtual bus does not all answer action to export when various fault;
When protected bus i.e. I mother judges segmentation dead-zone fault occurs, envelope segmentation CT logic removes segmented current simultaneously in the little poor differential current computing of virtual bus and actual bus; Virtual bus is caused to meet criterion action outlet; Virtual bus does not carry out segmentation dead-zone fault differentiation (access model causes virtual bus not react other faults).
The outlet of virtual busbar trip can be adopted in two ways: this side bus differential protection direct output action node to the breaker operation cabinet of virtual bus connection; Two be use the bus differential protection outlet loop of virtual bus itself.
Claims (1)
1. realize a bus differential protection method for segmentation dead zone protection based on virtual bus, it is characterized in that, the step of the method is as follows:
(1) every section of bus in single-busbar multi-segment all independently arranges busbar differential protection device;
(2) every section of bus according on bus connect the position of block switch and quantity is carried out virtual to respective bus bars, fictionalize corresponding virtual bus; If the bus of segmentation is in two ends, the block switch be then connected with end bus is respectively one, the virtual bus of the block switch other end that the actual bus now fictionalizing end connects, if certain sectionalized bus is not be in end, what be then connected with this sectionalized bus has two block switches, now fictionalizes two virtual buses that two block switches that this sectionalized bus is connected are connected;
(3) by after equivalent for the electric current of each block switch negate, this side bus differential protection logic is counted;
(4) when block switch generation dead-zone fault, and troubles inside the sample space is belonged to for this side bus differential protection, when external area error is belonged to for the virtual bus of its correspondence, jump this side block switch, then send instruction jump virtual busbar sectional izing switch or use the bus differential protection outlet loop of virtual bus itself;
The realization of described step (3) has two kinds of modes: one is outside by the input terminal of segmented current reversed polarity access of virtual outlet; Two is the inputs of virtual outlet not outer portion, by after segmented current negate stored in virtual outlet corresponding stored district, described virtual outlet is connected with virtual bus, and the setting electric current of virtual outlet is contrary with segmented current amplitude identical polar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210166109.3A CN102684172B (en) | 2012-05-25 | 2012-05-25 | Bus differential protection method for realizing sectional dead zone protection based on virtual bus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210166109.3A CN102684172B (en) | 2012-05-25 | 2012-05-25 | Bus differential protection method for realizing sectional dead zone protection based on virtual bus |
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| CN102684172A CN102684172A (en) | 2012-09-19 |
| CN102684172B true CN102684172B (en) | 2015-01-07 |
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| CN103887779A (en) * | 2014-04-04 | 2014-06-25 | 国家电网公司 | Transfer trip method of power transmission line |
| CN103872669B (en) * | 2014-04-04 | 2017-01-18 | 国家电网公司 | Remote tripping method of electric transmission line |
| CN104993460A (en) * | 2015-06-21 | 2015-10-21 | 南京南瑞继保电气有限公司 | Improvement method of simple bus protection |
| CN105375446B (en) * | 2015-11-18 | 2018-08-17 | 许昌许继软件技术有限公司 | A kind of bus bar protecting method in complicated wiring applied to micro-capacitance sensor |
| CN106026040B (en) * | 2016-08-04 | 2018-05-11 | 南京国电南自电网自动化有限公司 | It is a kind of to prevent the abnormal differential protection method for bus several greatly of sampling |
| CN107317308B (en) * | 2017-07-28 | 2019-04-05 | 国网江苏省电力公司镇江供电公司 | Sectionalized single busbar connection 110kV bus differential protection is adaptively latched prepared auto restart guard method |
| CN108281944B (en) * | 2018-03-13 | 2023-11-24 | 中国电建集团北京勘测设计研究院有限公司 | Differential protection connection system suitable for single bus sectionalized wiring and tripping logic method thereof |
| CN111668816B (en) * | 2020-05-14 | 2022-07-12 | 许昌许继软件技术有限公司 | Breaker dead zone fault processing method based on electronic transformer |
| CN113937732B (en) * | 2021-10-11 | 2023-05-02 | 国网山东省电力公司滨州供电公司 | Multi-functional high overload distribution transformer's segmentation protection device |
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Owner name: XUJI ELECTRIC CO., LTD. Free format text: FORMER OWNER: XUJI GROUP CO., LTD. Effective date: 20131129 Owner name: XUCHANG XUJI SOFTWARE TECHNOLOGY CO., LTD. STATE G Free format text: FORMER OWNER: XUJI ELECTRIC CO., LTD. XUCHANG XUJI SOFTWARE TECHNOLOGY CO., LTD. SHANDONG ELECTRIC POWER CORP. QINGDAO POWER SUPPLY COMPANY OF SHANDONG ELECTRIC POWER CORPORATION Effective date: 20131129 |
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Effective date of registration: 20131129 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: Xuji Electric Co., Ltd. Applicant after: Xuchang Xuji Software Technology Co., Ltd. Applicant after: State Grid Shandong Electric Power Company Applicant after: Qingdao Power Supply Company, State Grid Shandong Electric Power Company Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Group Co., Ltd. Applicant before: Xuji Electric Co., Ltd. Applicant before: Xuchang Xuji Software Technology Co., Ltd. Applicant before: Shandong Electric Power Corp. Applicant before: Qingdao Power Supply Co., Ltd., Shandong Electric Power Corporation |
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Granted publication date: 20150107 Termination date: 20190525 |