CN205317886U - Undercurrent earth fault route selection system - Google Patents
Undercurrent earth fault route selection system Download PDFInfo
- Publication number
- CN205317886U CN205317886U CN201620056745.4U CN201620056745U CN205317886U CN 205317886 U CN205317886 U CN 205317886U CN 201620056745 U CN201620056745 U CN 201620056745U CN 205317886 U CN205317886 U CN 205317886U
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- module
- selection system
- route selection
- small current
- earth fault
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Abstract
The utility model provides an undercurrent earth fault route selection system, includes control module, control module is connected to operation module, communication module, controlled circuit, display module and storage module through the electric conductor, controlled circuit includes three feeders of A, B and C, and three feeders of A, B and C all are connected to the transformer generating line of transformer substation, the neutral point department of three feeders of A, B and C all installs zero sequence voltage transformer, and zero sequence voltage transformer passes through grounding. The utility model discloses the difficult problem of phase to earth fault route selection among the small current neutral grounding sys tem has been solved effectively to not disturbed by electric power system, having improved the success rate and the rate of accuracy of route selection, when taking place phase to earth fault, non - fault voltage is less than 1.732 times phase voltage basically, require than lower the insulation of equipment in the electric wire netting, and can be when breaking down automatic alarm.
Description
Technical field
This utility model relates to small current ground connection technology field, is specially a kind of small current grounding failure wire selection system.
Background technology
Small current line selection full name Small Electric Current Earthing And Routing Device, is called for short small area analysis. it is the protection equipment of a kind of power industry use. this equipment is applicable to 3KV-66KV isolated neutral or neutral point through resistance, the single-phase grounding selecting of arc suppression coil earthing system, transformer station for power system, power plant, power station and chemical industry, recover the oil, metallurgical, coal, the electric power system of the large-scale industrial enterprise such as railway, it is able to indicate that the circuit that singlephase earth fault occurs, for 10kV isolated neutral power distribution network, when a certain bar circuit generation single-phase earthing, its principal character: the size of zero-sequence current on non-faulting line, capacitive earth current equal to this circuit itself, direction is flowed to circuit by bus, the size of zero-sequence current on fault wire, equal to all non-fault line capacitive earth current sums, direction is flowed to bus by circuit. at present, it is typically only capable to utilize the difference of above-mentioned zero-sequence current, adopts zero sequence power direction method or zero-sequence current amplitude com parison method to realize microcomputer earthing wire-selecting. owing to isolated neutral system singlephase earth fault amount is little, fault signature is inconspicuous, plus the impact being subject to the many factors such as electric network composition, nature of trouble, zero sequence current mutual inductor precision, earthing wire-selecting accuracy rate is not high, it is usually no more than 70%, for the problems referred to above, a kind of small current grounding failure wire selection system of special proposition.
Utility model content
The purpose of this utility model is in that to provide a kind of small current grounding failure wire selection system, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, this utility model provides following technical scheme: a kind of small current grounding failure wire selection system, including controlling module, described control module is connected to operation module, communication module, controlled circuit, display module and storage module by electric conductor, described controlled circuit includes three feeder lines of A, B and C, and three feeder lines of A, B and C are all connected to the power transformation bus of transformer station, described A, three feeder lines of B and C neutral point place be mounted on zero sequential potential transformer, and zero sequential potential transformer passes through resistance eutral grounding.
Preferably, described A, three feeder lines of B and C neutral point place arc suppression coil is installed.
Preferably, the electric connection mode of described operation module and control module is two-way electrical connection.
Preferably, described control module is connected to alarm module by electric conductor.
Compared with prior art, the beneficial effects of the utility model are: a kind of small current grounding failure wire selection system, efficiently solve the problem that single-phase grounding fault line selection in small current grounding is difficult, and do not disturbed by power system, improve success rate and the accuracy rate of route selection, when there is singlephase earth fault, non-faulting voltage is substantially less than the phase voltage of 1.732 times, apparatus insulated in electrical network is required relatively low, and can when breaking down automatic alarm.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of this utility model whole system;
Fig. 2 is the circuit diagram of controlled circuit in this utility model;
Fig. 3 is the flow chart controlling module in this utility model.
In figure: 1, control module, 2, operation module, 3, communication module, 4, controlled circuit, 5, display module, 6, storage module.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
Refer to Fig. 1-3, this utility model provides a kind of technical scheme: a kind of small current grounding failure wire selection system, including controlling module 1, described control module 1 is connected to operation module 2 by electric conductor, communication module 3, controlled circuit 4, display module 5 and storage module 6, described controlled circuit 4 includes A, three feeder lines of B and C, and A, three feeder lines of B and C are all connected to the power transformation bus of transformer station, described A, the neutral point place of three feeder lines of B and C is mounted on zero sequential potential transformer, and zero sequential potential transformer passes through resistance eutral grounding, efficiently solve the problem that single-phase grounding fault line selection in small current grounding is difficult, and do not disturbed by power system, improve success rate and the accuracy rate of route selection, when there is singlephase earth fault, non-faulting voltage is substantially less than the phase voltage of 1.732 times, apparatus insulated in electrical network is required relatively low.
Specifically, described A, three feeder lines of B and C neutral point place arc suppression coil is installed, it is possible to prevent the electric arc produced in use from can not certainly go out, the problem causing power outage and device damage.
Specifically, the electric connection mode of described operation module 2 and control module 1 is two-way electrical connection, it is possible to achieve the transmitted in both directions of data between operation module 2 and control module 1.
Specifically, described control module 1 is connected to alarm module 7 by electric conductor, it is possible to the automatic alarm when breaking down.
Operation principle: by by the neutral ground of three feeder lines of A, B and C in system, use the residual voltage in zero sequential potential transformer detection controlled circuit 4, and calculate zero-sequence current, faulty circuit differs 180 degree with the zero-sequence current of healthy circuit, and then calculate the position of faulty circuit automatic alarm.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, being appreciated that when without departing from principle of the present utility model and spirit and these embodiments can be carried out multiple change, amendment, replacement and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. a small current grounding failure wire selection system, including controlling module (1), it is characterized in that: described control module (1) is connected to operation module (2), communication module (3), controlled circuit (4), display module (5) and storage module (6) by electric conductor, described controlled circuit (4) includes three feeder lines of A, B and C, and three feeder lines of A, B and C are all connected to the power transformation bus of transformer station, described A, three feeder lines of B and C neutral point place be mounted on zero sequential potential transformer, and zero sequential potential transformer passes through resistance eutral grounding.
2. a kind of small current grounding failure wire selection system according to claim 1, it is characterised in that: described A, three feeder lines of B and C neutral point place arc suppression coil is installed.
3. a kind of small current grounding failure wire selection system according to claim 1, it is characterised in that: described operation module (2) and the electric connection mode controlling module (1) they are two-way electrical connection.
4. a kind of small current grounding failure wire selection system according to claim 1, it is characterised in that: described control module (1) is connected to alarm module (7) by electric conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620056745.4U CN205317886U (en) | 2016-01-20 | 2016-01-20 | Undercurrent earth fault route selection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620056745.4U CN205317886U (en) | 2016-01-20 | 2016-01-20 | Undercurrent earth fault route selection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205317886U true CN205317886U (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620056745.4U Expired - Fee Related CN205317886U (en) | 2016-01-20 | 2016-01-20 | Undercurrent earth fault route selection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN205317886U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221115A (en) * | 2019-07-10 | 2019-09-10 | 山东钢铁股份有限公司 | The determination method, apparatus and equipment of unbalanced earth fault capacitance current |
-
2016
- 2016-01-20 CN CN201620056745.4U patent/CN205317886U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221115A (en) * | 2019-07-10 | 2019-09-10 | 山东钢铁股份有限公司 | The determination method, apparatus and equipment of unbalanced earth fault capacitance current |
| CN110221115B (en) * | 2019-07-10 | 2021-07-02 | 山东钢铁股份有限公司 | Method, device and equipment for determining single-phase grounding capacitance current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160615 Termination date: 20170120 |
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| CF01 | Termination of patent right due to non-payment of annual fee |