CN206147037U - Fault line selection device based on nimble ground connection mode of neutral point - Google Patents
Fault line selection device based on nimble ground connection mode of neutral point Download PDFInfo
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- CN206147037U CN206147037U CN201621102453.6U CN201621102453U CN206147037U CN 206147037 U CN206147037 U CN 206147037U CN 201621102453 U CN201621102453 U CN 201621102453U CN 206147037 U CN206147037 U CN 206147037U
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- route selection
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- resistance
- line selection
- neutral point
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a fault line selection device based on nimble ground connection mode of neutral point belongs to distribution network phase to earth fault route selection technical field. Fault line selection device be by the collection module who possesses data acquisition function connect gradually through communication cable possess signal input, the main control unit of trouble route selection, data analysis, signal output function and possess the nimble ground resistance cabinet of neutral point of rapid change route selection resistance size function, main control unit signal output to data acquisition function 1. When distribution lines breaks down, the rate of accuracy of middle or small transition resistance situation trouble route selection at present can be improved through the different resistance route selection resistance of nimble switching by a wide margin, the collaborative work of a plurality of trouble route selection calculating unit is combined, many criterions parallel processing, metallicity earth fault route selection rate of accuracy can reach 100%. Quick route selection can be realized to the quick switching that uses quick gas switch to carry out distribution network neutral point route selection resistance, and control temporal accuracy reaches the microsecond magnitude.
Description
Technical field
This utility model is related to a kind of fault line selection device based on neutral point neutral flexible grounding mode, belongs to power distribution network single-phase
Earth fault line selection technical field.
Background technology
At present, domestic and international correlation technique unit is by having analysed in depth low current grounding system power distribution network singlephase earth fault
Feature, around characteristic informations such as voltage and current power frequency transient state, stable state, harmonic wave, energy, explores various faults selection method,
Such as zero sequence drying method, zero sequence power direction method, first half-wave transient current method, energy route selection method, and signal injection method etc., and phase
After being proposed several generations failure line selection protection device.Commercial low-current ground fault line selection device is with single-chip microcomputer mostly in the market
For hardware core, built based on above-mentioned a certain location design.But these following problems of product generally existing：The
One, the fault-line selecting method of single features Parameters variation is depended on, as the limitation that route selection theory and technology is realized causes choosing
The sensitivity of line apparatus and accuracy be not high, it is impossible to meets the detection of distribution network failure high-accuracy and requires；Second, it is existing to pass through
Switching route selection resistance carries out the device of route selection typically using general switchgear come switching route selection resistance, generally existing switch excision
Arc reignition during resistance, is difficult the shortcoming of fast shut-off；3rd, existing technology and product function it is single, be both for mostly
Failure line selection during metallic earthing failure, although achieve comparatively ideal achievement for this state of the art, but in arc grounding
Deng then seeming unable to do what one wishes under high resistant ground fault condition, route selection accuracy is generally relatively low.This is because in high resistive fault situation
When, the diagnosis capability for being used for traditional criterion of metallic earthing failure in the past declines to a great extent.
Utility model content
The purpose of this utility model is for the shortcoming for overcoming conventional failure line selection apparatus route selection accuracy low, there is provided Yi Zhongji
In the fault line selection device of neutral point neutral flexible grounding mode.
In order to realize object above, the technical scheme adopted by this utility model is：
A kind of fault line selection device based on neutral point neutral flexible grounding mode, is by the collection mould for possessing data acquisition function
Block be sequentially connected by communication cable possess signal input, failure line selection, data analysiss, the master controller of signal output function and
Possesses the rapid neutral point neutral flexible grounding resistor box for changing route selection resistance magnitude function, master controller signal output is to aobvious control
Terminal.
The acquisition module is by the current transformer (CT) for possessing measurement circuitry function of current and possesses measurement circuitry
Voltage transformer (PT) composition of voltage function, on transmission line of electricity.
The signal input unit for possessing Signals collecting function that the master controller is sequentially connected by data wire, possesses failure
The signal output of the failure line selection unit, the central control unit for possessing analytical data function and analysis result output of route selection function
Unit is constituted.
The neutral point neutral flexible grounding resistor box changes trouble point feature functionality by possessing of being connected in parallel of power cable
Multiple gas high-speed switch compositions of multiple route selection resistance and quick-switching route selection resistance function.
The neutral point neutral flexible grounding resistor box includes possessing signal processing energy by what holding wire, control cable were sequentially connected
Li Xiankong centers, the electronic display for showing failure line selection result in real time, the port of output fault alarm signal and output are disconnected
The port of road device divide-shut brake control instruction function.
The beneficial effects of the utility model：
When distribution line breaks down, middle or small transition electricity can be greatly improved by flexible switching difference resistance route selection resistance
The accuracy rate of resistance situation failure line selection at present, with reference to multiple failure line selection computing unit collaborative works, many criterion parallel processings, gold
Attribute earth fault line selection accuracy rate is up to 100%；The fast of power network neutral point route selection resistance is carried out using fast gas switch
Fast switching, the switch can very it is low it is under-voltage than under stably trigger, it is stable and reliable for performance；Switching arc is easy to extinguish, and does not deposit
In the difficult problem of breath arc, and control time precision is up to musec order, it is possible to achieve fast line selection, can realize higher high resistant
Failure line selection accuracy rate.
Description of the drawings
Composition and working principle figures of the Fig. 1 for this utility model fault line selection device；
Composition and working principle figures of the Fig. 2 for master controller；
Composition and fundamental diagram of the Fig. 3 for neutral point neutral flexible grounding resistor box；
Composition and fundamental diagram of the Fig. 4 for display and control terminal.
Specific embodiment
Following embodiments are only described in further detail to this utility model, but are not constituted to any limit of the present utility model
System.
As shown in figure 1, fault line selection device be by the acquisition module 101 for possessing data acquisition function by communication cable according to
Secondary connection possesses signal input, failure line selection, data analysiss, the master controller 102 of signal output function and possesses rapid change
The neutral point neutral flexible grounding resistor box 103 of route selection resistance magnitude function, master controller signal output is to display and control terminal 104.
Acquisition module 101 is by the current transformer (CT) for possessing measurement circuitry function of current and possesses measurement circuitry electricity
Voltage transformer (PT) composition of pressure function, which is arranged on transmission line of electricity.
As shown in Fig. 2 master controller 102 includes the signal input for possessing Signals collecting function being sequentially connected by data wire
Unit 201, the failure line selection unit 202 for possessing failure line selection function, 203 and of central control unit for possessing analytical data function
The signal output unit 204 of analysis result output is constituted.
As shown in figure 3, neutral point neutral flexible grounding resistor box 103 includes possessing change failure by what power cable was connected in parallel
305～308 groups of the gas high-speed switch of the route selection resistance 301～304 and quick-switching route selection resistance function of point feature functionality
Into.
As shown in figure 4, display and control terminal 104 includes possessing signal handling capacity by what holding wire, control cable were sequentially connected
Xian Kong centers 401, the electronic display 402 for showing in real time failure line selection result, 403 and of port of output fault alarm signal
The port 404 of output circuit-breaker switching on-off control instruction function constitutes.
The operation principle and flow process of above-mentioned line selection apparatus be：
(1), when power distribution network normally runs, through grounding through arc, line selection apparatus on-line real time monitoring is female for distribution neutral point
Line PT output signals；
(2) when data acquisition module 101 detects bus PT open deltas output residual voltage exceedes setting valve, tentatively
Judge that circuit occurs singlephase earth fault, master controller starts the CT current datas for gathering each outlet；
(3) the 305 quick triggering and conducting of gas switch in the control neutral point neutral flexible grounding of master controller 102 resistor box 103,
Route selection resistance 301 is incorporated to into distribution neutral point, while continuing to monitor the fault characteristic information in CT data；
(4) by switching 306～308 switching resistance 302～304, change the resistance of neutral point parallel connection route selection resistance, while
Observe and extract the fault characteristic information of faulty line；
(5) if it is determined that fault type is metallic earthing, master controller 102 starts metallic earthing failure line selection algorithm；
If it is determined that being high resistance earthing fault, master controller 102 starts carries out failure line selection for the algorithm of high resistance earthing fault；
(6) the preliminary route selection result that above-mentioned steps are obtained finally is collected by master controller central control unit 203, and is passed through
Mathematical model decision-making goes out final route selection result；
(7) after completing route selection, 305～308 rapid shut-off excision of the control plasma jet of master controller 102 trigger switch
Power network neutral point route selection resistance 301～304 in parallel；
(8) display and control terminal 104 shows failure line selection result outputting alarm indication signal.
Claims (5)
1. a kind of fault line selection device based on neutral point neutral flexible grounding mode, it is characterised in that：The fault line selection device is
It is sequentially connected by communication cable by the acquisition module (101) for possessing data acquisition function and possesses signal input, failure line selection, number
According to analysis, the master controller (102) of signal output function and possesses the neutral point of rapid change route selection resistance magnitude function
Neutral flexible grounding resistor box (103), master controller signal output to display and control terminal (104).
2. fault line selection device according to claim 1, it is characterised in that：The acquisition module (101) is by possessing survey
The current transformer of amount line current function, the voltage transformer composition of measurement circuitry voltage function, which is arranged on power transmission line
Lu Shang.
3. fault line selection device according to claim 1 and 2, it is characterised in that：The master controller (102) is by data wire
The signal input unit (201) for possessing Signals collecting function being sequentially connected, the failure line selection unit for possessing failure line selection function
(202), possesses signal output unit (204) group of central control unit (203) and the analysis result output of analytical data function
Into.
4. fault line selection device according to claim 1 and 2, it is characterised in that：The neutral point neutral flexible grounding resistor box
(103) by possessing of being connected in parallel of power cable change the route selection resistance (301) of trouble point feature functionality, route selection resistance (302),
The gas high-speed switch (305) of route selection resistance (303), route selection resistance (304) and quick-switching route selection resistance function, gas are quick
Switch (306), gas high-speed switch (307), gas high-speed switch (308) composition.
5. fault line selection device according to claim 1 and 2, it is characterised in that：Described neutral point neutral flexible grounding resistance
Cabinet (103) includes the Xian Kong centers (401) for possessing signal handling capacity being sequentially connected by holding wire, control cable, shows in real time
Show electronic display (402), the port (403) of output fault alarm signal and the output circuit-breaker switching on-off of failure line selection result
The port (404) of control instruction function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621102453.6U CN206147037U (en) | 2016-09-30 | 2016-09-30 | Fault line selection device based on nimble ground connection mode of neutral point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621102453.6U CN206147037U (en) | 2016-09-30 | 2016-09-30 | Fault line selection device based on nimble ground connection mode of neutral point |
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| Publication Number | Publication Date |
|---|---|
| CN206147037U true CN206147037U (en) | 2017-05-03 |
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| CN201621102453.6U Active CN206147037U (en) | 2016-09-30 | 2016-09-30 | Fault line selection device based on nimble ground connection mode of neutral point |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271850A (en) * | 2017-07-01 | 2017-10-20 | 合肥东玖电气有限公司 | A kind of Small Electric Current Earthing And Routing Device |
| CN111141990A (en) * | 2018-10-17 | 2020-05-12 | 李景禄 | Ground fault identification and ground line selection method based on zero sequence current resistive component |
-
2016
- 2016-09-30 CN CN201621102453.6U patent/CN206147037U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271850A (en) * | 2017-07-01 | 2017-10-20 | 合肥东玖电气有限公司 | A kind of Small Electric Current Earthing And Routing Device |
| CN111141990A (en) * | 2018-10-17 | 2020-05-12 | 李景禄 | Ground fault identification and ground line selection method based on zero sequence current resistive component |
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