CN204230888U - A kind of neutral point of electric network mixed type earthing device - Google Patents
A kind of neutral point of electric network mixed type earthing device Download PDFInfo
- Publication number
- CN204230888U CN204230888U CN201420747068.1U CN201420747068U CN204230888U CN 204230888 U CN204230888 U CN 204230888U CN 201420747068 U CN201420747068 U CN 201420747068U CN 204230888 U CN204230888 U CN 204230888U
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- China
- Prior art keywords
- neutral point
- nonlinear resistance
- suppression coil
- valve block
- arc suppression
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- Expired - Fee Related
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 25
- 230000001629 suppression Effects 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 8
- 238000000205 computational method Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Abstract
A kind of neutral point of electric network mixed type earthing device, comprises high energy ZnO valve block group, fuse arc suppression coil; It is characterized in that: described high energy ZnO valve block group is connected with fuse, form nonlinear resistance branch road; Described nonlinear resistance branch road and arc suppression coil are connected in parallel; This neutral point of electric network mixed type earthing device, nonlinear resistance is in parallel with arc suppression coil; Existing arc suppression coil can eliminate the advantage of the fault such as electric arc and resonance; Again due to nonlinear resistance branch road in parallel, the overvoltage of system neutral is also limited in insulation allowed band, and add the real component of zero-sequence current, adopt specific computational methods that route selection accuracy rate can be made to improve, the reliability of power supply and fail safe are improved a lot; Overall structure is simple, practical, easily manufactured, is easy to promote the use of.
Description
Technical field
The utility model relates to electric power system earthing device field, especially a kind of neutral point of electric network mixed type earthing device.
Background technology
The neutral grounding mode of electric power system is mainly divided into direct grounding way and non_direct ground mode.Described direct grounding way comprises direct ground connection and through low resistance grounding, the effective grounding of medium voltage network is mainly through the mode of low resistance grounding, the overvoltage level of this mode is lower, route selection accuracy rate is high, earth fault can be found rapidly, but its power supply reliability and fail safe poor, serious threat personal safety, also can produce very large interference to secondary line and electronics.
Described non_direct ground mode comprises isolated neutral and through grounding through arc mode.Wherein earth-freely be mainly used in overhead transmission line and the less system of network, in China's legacy network, occupy larger ratio.Its cost is low, and structure is simple, and power supply reliability and fail safe are all higher, but overvoltage multiple is high, threatens larger to system insulation.Along with the increase of cable line, system earth capacitance current is increasing, and when there is single-phase earthing, electric arc not easily extinguishes, and can produce very high overvoltage, is mainly used in the larger system of earthing capacitance current through arc-suppression grounded.
It utilizes inductance current compensation of ground capacitance current, and make single-phase earthing residual less, after zero passage, electric arc is no longer restriked, have very high power supply reliability and fail safe, but its overvoltage multiple is high, precision tuning difficulty is large, route selection accuracy rate is low, and cost is high, is unfavorable for electrical network perspective long-term plan.
Prior art can not meet the needs of people, and for making up prior art deficiency, it is simple that the utility model aims to provide a kind of structure, stable performance, the neutral point of electric network mixed type earthing device that power supply reliability is high, automaticity is high.
For achieving the above object, the utility model by the following technical solutions: a kind of neutral point of electric network mixed type earthing device, comprises high energy ZnO valve block group, fuse arc suppression coil; It is characterized in that: described high energy ZnO valve block group is connected with fuse, form nonlinear resistance branch road; Described nonlinear resistance branch road and arc suppression coil are connected in parallel.
As further technical scheme of the present utility model: described high energy ZnO valve block group is formed by Multi-path non-linearity resistor coupled in parallel; Described earthing device is also provided with controller; When earth fault occurs, arc suppression coil can eliminate the fault such as electric arc and resonance; Due to nonlinear resistance branch road in parallel, the overvoltage of system neutral is also limited in insulation allowed band, and add the real component of zero-sequence current, adopt specific computational methods that route selection accuracy rate can be made to improve, the reliability of power supply and fail safe are improved a lot.After ground connection occurs, due to the characteristic of nonlinear resistance branch road, neutral point voltage is very low, and make mixed type earthing device be high-impedance state, system is equivalent to earth-free, improves power supply reliability and fail safe.
Further, described arc suppression coil, by inductance current compensation of ground capacitance current, makes single-phase earthing residual flow less, and circuit is high induction reactance state and resonance is disappeared.
Further, neutral point voltage can be limited within the scope of insulation according to different running statuses from fuse nonlinear resistance in series branch road by described high energy zinc valve block group; System is made to find earth fault rapidly.
Compared with prior art, the beneficial effects of the utility model are: this neutral point of electric network mixed type earthing device, and nonlinear resistance is in parallel with arc suppression coil; Existing arc suppression coil can eliminate the advantage of the fault such as electric arc and resonance; Again due to nonlinear resistance branch road in parallel, the overvoltage of system neutral is also limited in insulation allowed band, and add the real component of zero-sequence current, adopt specific computational methods that route selection accuracy rate can be made to improve, the reliability of power supply and fail safe are improved a lot; Overall structure is simple, practical, easily manufactured, is easy to promote the use of.
Utility model content
Accompanying drawing explanation
Fig. 1 is the structural representation of neutral point of electric network mixed type earthing device of the present utility model;
Fig. 2 is the using state schematic diagram of neutral point of electric network mixed type earthing device of the present utility model;
Wherein: 1, high energy ZnO valve block group, 2, fuse, 3, arc suppression coil.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of neutral point of electric network mixed type earthing device, comprises high energy ZnO valve block group 1, fuse 2 and arc suppression coil 3; It is characterized in that: described high energy ZnO valve block group 1 is connected with fuse 2, form nonlinear resistance branch road; Described nonlinear resistance branch road and arc suppression coil 3 are connected in parallel.
As further technical scheme of the present utility model: described high energy ZnO valve block group is formed by Multi-path non-linearity resistor coupled in parallel; Described earthing device is also provided with controller.
Action principle of the present utility model is: earthing device comprises arc suppression coil 3, high energy ZnO valve block group 1 and fuse 2.High energy ZnO valve block group 1 and fuse 2 nonlinear resistance branch road in series; Nonlinear resistance branch road is in parallel with arc suppression coil 3.Described high energy ZnO valve block group 1 is formed by Multi-path non-linearity resistor coupled in parallel; each road nonlinear resistance due to adopt equal energy, current-sharing, all press Computing Principle design; the consistent described fuse 2 of voltage-current characteristic safety on each road under extreme conditions can quick fuse; protection high energy zinc valve block group; prevent resistance self from producing a large amount of heats, improve the coefficient of reliability of self.
During use, this earthing device is connected between the neutral point of system and ground, the value of opening of high energy ZnO valve block group 1 is arranged on system phase voltage level, when ground connection occurs, its conducting flow is very large after switch to utilize the non-linear behavior of nonlinear resistance branch road, system neutral point voltage is limited in allowed band, limits the overvoltage value of system.After ground connection occurs, because high energy ZnO valve block is high-impedance state, system neutral is equivalent to earth-free state.
When earth fault occurs, arc suppression coil, by inductance current compensation of ground capacitance current, makes single-phase earthing residual flow less, impel electric arc from putting out and making the rate of climb of arc gap recovery voltage slow down, for the final extinguishing of electric arc provides condition, ensure that the extinguishing of electric arc, avoid restriking.In addition, circuit is high induction reactance state and resonance is disappeared.
When earth fault occurs, grounding through arc mode makes earth point residual flow very little, the earth current of Current Transmit secondary side sampling is very weak, cannot failure judgement, after arc suppression coil and nonlinear resistance branch circuit parallel connection, add the real component of zero-sequence current, adopt specific computational methods that route selection accuracy rate can be made to improve.This mixed type earthing device overcomes the inaccurate shortcoming of grounding through arc mode route selection.
In addition, current transformer and signal controller can be connected at earth terminal, for relaying protection provides foundation.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
The above; be only preferred embodiment of the present utility model; not in order to limit the utility model, every above embodiment is done according to technical spirit of the present utility model any trickle amendment, equivalently replace and improve, within the protection range that all should be included in technical solutions of the utility model.
Claims (3)
1. a neutral point of electric network mixed type earthing device, comprises high energy ZnO valve block group (1), fuse (2) and arc suppression coil (3); It is characterized in that: described high energy ZnO valve block group (1) is connected with fuse (2), form nonlinear resistance branch road; Described nonlinear resistance branch road and arc suppression coil (3) are connected in parallel.
2. a kind of neutral point of electric network mixed type earthing device according to claim 1, is characterized in that: described high energy ZnO valve block group (1) is formed by Multi-path non-linearity resistor coupled in parallel.
3. a kind of neutral point of electric network mixed type earthing device according to claim 1: described arc suppression coil (3), by inductance current compensation of ground capacitance current, makes single-phase earthing residual flow less, and circuit is high induction reactance state and resonance is disappeared; Neutral point voltage can be limited within the scope of insulation according to different running statuses from fuse (2) nonlinear resistance in series branch road by described high energy zinc valve block group (1), makes it possible to find earth fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420747068.1U CN204230888U (en) | 2014-12-03 | 2014-12-03 | A kind of neutral point of electric network mixed type earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420747068.1U CN204230888U (en) | 2014-12-03 | 2014-12-03 | A kind of neutral point of electric network mixed type earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204230888U true CN204230888U (en) | 2015-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420747068.1U Expired - Fee Related CN204230888U (en) | 2014-12-03 | 2014-12-03 | A kind of neutral point of electric network mixed type earthing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204230888U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159886A (en) * | 2016-08-18 | 2016-11-23 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of SPD wiring patterns protecting power-frequency overvoltage |
| CN107681646A (en) * | 2017-10-27 | 2018-02-09 | 国网河南省电力公司漯河供电公司 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
-
2014
- 2014-12-03 CN CN201420747068.1U patent/CN204230888U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159886A (en) * | 2016-08-18 | 2016-11-23 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of SPD wiring patterns protecting power-frequency overvoltage |
| CN107681646A (en) * | 2017-10-27 | 2018-02-09 | 国网河南省电力公司漯河供电公司 | It is a kind of to be used for guard method of the arc suppression coil under chopping 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20161203 |