CN202817737U - FTU-based undercurrent grounding system - Google Patents
FTU-based undercurrent grounding system Download PDFInfo
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- CN202817737U CN202817737U CN 201220405598 CN201220405598U CN202817737U CN 202817737 U CN202817737 U CN 202817737U CN 201220405598 CN201220405598 CN 201220405598 CN 201220405598 U CN201220405598 U CN 201220405598U CN 202817737 U CN202817737 U CN 202817737U
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- 238000001514 detection method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 3
- 230000001934 delay Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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Abstract
Provided is an FTU-based undercurrent grounding system, comprising at least three breakers sequentially and serially connected via feed lines and FTUs arranged upon each breaker. When something is wrong with the line, the fault current flows through the first FTU, the second FTU, and the third FTU, and the first FTU, the second FTU, and the third FTU respectively generate the first voltage, the second voltage, and the third voltage which are corresponding to the fault current as well as the first time delay, the second time delay, and the third time delay which are corresponding to the first voltage, the second voltage, and the third voltage. The first FTU, the second FTU, and the third FTU respectively control the corresponding first breaker, the second breaker, and the third breaker according to the first voltage, the second voltage, and the third voltage as well as the first time delay, the second time delay, and the third time delay. The FTU-based undercurrent grounding system realizes the selectivity of the FTU motion, thus to realize the rapid isolation and reconstruction of the feed line fault.
Description
Technical field
The utility model particularly about small current neutral grounding system, is a kind of small current neutral grounding system based on FTU about electric power system concretely.
Background technology
Feeder automation is the core of power distribution automation, is the topmost control function of power distribution automation.Along with application and the development of Distribution Automation Technology, certain variation has occured in the principle of feeder automation and implementation, has experienced following four developing stage: the automatic circuit mode that (1) is traditional, and this stage has become history; (2) based on the centralized control automation of communication, be applied in present a large amount of pilots at home; (3) the centralized control mixed-control mode of being combined with decentralized control; the prerequisite in this stage is the extensive use of circuit breaker in distribution: the distributing that transfer fully (4) is protected control mode on the spot, and this stage might become the main way of feeder automation from now on.
In stage 3 and stage 4, electrical power distribution automatization system depends on the centralized automation scheme of local communication between the feeder automation detection and control terminal (Feeder terminal unit, FTU) and TOCOM total communication.The raising of communication level has determined form and the implementation level that automation realizes, has also greatly improved distribution network automated system integration degree simultaneously.All become a part in distribution network automated based on SCADA system, generalized information system and the various distribution operation function subsystem of TOCOM total communication mode.
The main purpose of feeder automation is to improve power supply reliability and improve the quality of power supply, this has proposed requirement to the reliability of centralized feeder automation when communication system breaks down, namely combine with the reserved regimen that does not rely on communication, on the other hand, the function of feeder automation merges with communicating by letter mutually to a certain extent, will be unfavorable for that distribution automation system is to functionalization, modularization development.When the communication system abnormal, the reliability of system is lower.
The utility model content
The utility model embodiment provides a kind of small current neutral grounding system based on FTU, and the residual voltage after the fault-time response curve is the basis, has realized the selectivity of FTU action, thereby realizes quick isolation and reconstruct to feeder fault.
The purpose of this utility model is, a kind of small current neutral grounding system based on feeder automation detection and control terminal FTU is provided, and specifically comprises: at least three circuit breakers of connecting successively by feeder line, be arranged on the FTU on each circuit breaker;
Wherein, the first circuit breaker is connected with the 3rd circuit breaker by the second circuit breaker,
The one FTU, the 2nd FTU, the 3rd FTU are separately positioned on described the first circuit breaker, the second circuit breaker, the 3rd circuit breaker;
When line fault, fault current flows through a described FTU, the 2nd FTU, the 3rd FTU, a described FTU, the 2nd FTU, the 3rd FTU generate respectively first voltage corresponding with described fault current, second voltage, tertiary voltage and with described the first voltage, second voltage, tertiary voltage, corresponding the first time delay, the second time delay, the 3rd time delay;
A described FTU, the 2nd FTU, the 3rd FTU are respectively according to described the first voltage, second voltage, tertiary voltage and the first time delay, the second time delay, corresponding the first circuit breaker, the second circuit breaker, the 3rd circuit breaker of the 3rd time delay control.
The beneficial effects of the utility model are, provide a kind of distributed feeder line of communication that do not rely on from system, the residual voltage of this system after the fault-time response curve is the basis, realized the selectivity of FTU action, thereby realize quick isolation and reconstruct to feeder fault, this system is separated feeder automation function and communication system to a certain extent, both can be applied to not have the less feeder automation of investment of communication system, also can be through transforming the reserved regimen as centralized feeder automation.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The schematic diagram of a kind of small current neutral grounding system based on FTU that Fig. 1 provides for the utility model embodiment;
The schematic diagram of the execution mode two of a kind of small current neutral grounding system based on FTU that Fig. 2 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
In the prior art, the troubleshooting of feeder automation is compared with Microcomputer Protection, depends on more a plurality of FTU of small current neutral grounding system are considered as an indivisible integral body solve the Fault Isolation problem.Ordinary circumstance, FTU itself does not have selectivity, and it places one's entire reliance upon to communicate by letter and realizes selectivity.If can make the FTU local message that places one's entire reliance upon realizes the selectivity of fault then can realizing not relying on the feeder automation of communication system.
Fig. 1 specifically comprises for the utility model embodiment provides a kind of small current neutral grounding system based on feeder automation detection and control terminal FTU: at least three circuit breakers of connecting successively by feeder line, be arranged on the FTU on each circuit breaker;
Wherein, the first circuit breaker is connected with the 3rd circuit breaker by the second circuit breaker,
The one FTU, the 2nd FTU, the 3rd FTU are separately positioned on described the first circuit breaker, the second circuit breaker, the 3rd circuit breaker;
When line fault, fault current flows through a described FTU, the 2nd FTU, the 3rd FTU, a described FTU, the 2nd FTU, the 3rd FTU generate respectively first voltage corresponding with described fault current, second voltage, tertiary voltage and with described the first voltage, second voltage, tertiary voltage, corresponding the first time delay, the second time delay, the 3rd time delay;
A described FTU, the 2nd FTU, the 3rd FTU are respectively according to described the first voltage, second voltage, tertiary voltage and the first time delay, the second time delay, corresponding the first circuit breaker, the second circuit breaker, the 3rd circuit breaker of the 3rd time delay control.When namely circuit breaker has fault current and corresponding voltage-drop is arranged under FTU detects it, send trip signal tripping circuit breaker under it through a time-delay.
In small current neutral grounding system, it is to need fast isolation that feeder fault only has three-phase shortcircuit and phase fault.When line fault, system as shown in Figure 1, the voltage on the feeder line (residual voltage) distributes different, and namely a FTU, the 2nd FTU are different with the 3rd FTU place residual voltage, are respectively U1, U2, U3.Can draw corresponding U-T curve according to different residual voltages, by visible different time delays in U-T curve.The one FTU, the 2nd FTU record simultaneously fault current and flow through, and the tripping operation time-delay of a FTU is Δ t1, and the tripping operation time-delay of the 2nd FTU is Δ t2, Δ t1＞Δ t2, U1〉U2, at this moment, the upper voltage-drop that occurs of the 2nd FTU, therefore the 2nd FTU controls the second circuit breaker and trips action with the excision fault.The one FTU continues output voltage, after the voltage recovery normally that it records, does not namely reach Δ t1, and when fault current disappearance, voltage recovery, a FTU regains trip signal.When namely between the second circuit breaker and the 3rd circuit breaker, breaking down, because the 3rd circuit breaker is interconnection switch, it is in open position, after the second circuit breaker excision fault, the first circuit breaker can also continue operation, can guarantee to greatest extent like this user's power supply.
The schematic diagram of the execution mode two of a kind of small current neutral grounding system based on FTU that Fig. 2 provides for the utility model embodiment, in execution mode two, be in series with successively 4 circuit breakers by feeder line, independently FTU is housed on each circuit breaker, in each FTU, has preseted time delays Δ t.When circuit breaker has fault current and corresponding voltage-drop is arranged under FTU detects it, send trip signal tripping circuit breaker under it through a time-delay.
The one FTU, the 2nd FTU record simultaneously fault current and flow through, the tripping operation time-delay of the one FTU is Δ t1, and the tripping operation time-delay of the 2nd FTU is Δ t2, Δ t1＞Δ t2, the second circuit breaker excision fault that trips first, after this a FTU will record and regain trip signal after voltage recovers.The 3rd circuit breaker is interconnection switch, be off-state at ordinary times, when the 3rd circuit breaker detects left side circuit (i.e. this side of the second circuit breaker) decompression, when the 3rd FTU that installs on the 3rd circuit breaker does not collect this side voltage of the second circuit breaker (being that U3 is close to zero), beginning timing Δ t3 closed a floodgate (not overlapping) after the time.Owing to be to close a floodgate in fault, the 4th circuit breaker has so far been realized Fault Isolation, network reconfiguration with tripping.
In other execution modes of a kind of small current neutral grounding system based on feeder automation detection and control terminal FTU that the utility model embodiment provides, it is a plurality of that the number of circuit breaker also can be 5,6 or other, repeats no more herein.
In sum, useful achievement of the present utility model is: a kind of small current neutral grounding system based on feeder automation detection and control terminal FTU is provided, do not rely on the distribution of communication, the residual voltage of this system after the fault-time response curve is the basis, realized the selectivity of FTU action, thereby realize quick isolation and reconstruct to feeder fault, this system is separated feeder automation function and communication system to a certain extent, both can be applied to not have the less feeder automation of investment of communication system, also can be through transforming the reserved regimen as centralized feeder automation.
Used specific embodiment in the utility model principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (1)
1. the small current neutral grounding system based on feeder automation detection and control terminal FTU is characterized in that, described small current neutral grounding system based on FTU specifically comprises: at least three circuit breakers of connecting successively by feeder line, be arranged on the FTU on each circuit breaker;
Wherein, the first circuit breaker is connected with the 3rd circuit breaker by the second circuit breaker,
The one FTU, the 2nd FTU, the 3rd FTU are separately positioned on described the first circuit breaker, the second circuit breaker, the 3rd circuit breaker;
When line fault, fault current flows through a described FTU, the 2nd FTU, the 3rd FTU, a described FTU, the 2nd FTU, the 3rd FTU generate respectively first voltage corresponding with described fault current, second voltage, tertiary voltage and with described the first voltage, second voltage, tertiary voltage, corresponding the first time delay, the second time delay, the 3rd time delay;
A described FTU, the 2nd FTU, the 3rd FTU are respectively according to described the first voltage, second voltage, tertiary voltage and the first time delay, the second time delay, corresponding the first circuit breaker, the second circuit breaker, the 3rd circuit breaker of the 3rd time delay control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405598 CN202817737U (en) | 2012-08-15 | 2012-08-15 | FTU-based undercurrent grounding system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405598 CN202817737U (en) | 2012-08-15 | 2012-08-15 | FTU-based undercurrent grounding system |
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| CN202817737U true CN202817737U (en) | 2013-03-20 |
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| CN 201220405598 Expired - Fee Related CN202817737U (en) | 2012-08-15 | 2012-08-15 | FTU-based undercurrent grounding system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113883A (en) * | 2021-11-13 | 2022-03-01 | 国网辽宁省电力有限公司葫芦岛供电公司 | Phase-asymmetric ground fault detection method |
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2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113883A (en) * | 2021-11-13 | 2022-03-01 | 国网辽宁省电力有限公司葫芦岛供电公司 | Phase-asymmetric ground fault detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20180815 |