CN201820605U - Disperse-compensation capacitance-current transformer for medium voltage system - Google Patents
Disperse-compensation capacitance-current transformer for medium voltage system Download PDFInfo
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- CN201820605U CN201820605U CN2010202573255U CN201020257325U CN201820605U CN 201820605 U CN201820605 U CN 201820605U CN 2010202573255 U CN2010202573255 U CN 2010202573255U CN 201020257325 U CN201020257325 U CN 201020257325U CN 201820605 U CN201820605 U CN 201820605U
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- 238000004804 winding Methods 0.000 claims abstract description 33
- 230000007935 neutral effect Effects 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000001629 suppression Effects 0.000 description 12
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The utility model relates to a disperse-compensation capacitance-current transformer for a medium voltage system, belonging to the technical field of ungrounded neutral point power supply system and ground capacitance and current compensation. The transformer comprises a flexural winding transformer, a fixed grounding inductor and a magnetic isolation plate, wherein the magnetic isolation plate is arranged between the flexural winding transformer and the fixed grounding inductor; primary windings of the flexural winding transformer are characterized in that each phase of winding is divided into an upper section and a lower section; each section of winding has the same turns; one phase of the upper winding section and the other phase of the lower winding section of winding are reversely connected in series to form one group, wherein the upper sections of winding A, B and C are led out and used as the high-voltage three-phase line out end of the transformer; and the lower sections of winding are connected with one another and used as neutral N which is led out and connected with a fixed grounding resistor X. the disperse-compensation capacitance-current transformer has the benefits of being simple to install, needing no debugging, being flexible for use, being maintenance-free, being capable of compensating the ground capacitance current in real time, and improving the power supply reliability of a power gird radically.
Description
Technical field
The utility model belongs to the isolated neutral electric power system, carries out capacitive earth current compensation technique field.
Background technology
In the isolated neutral electric power system, when system's capacitive earth current increases, once circuit single-phase earthing, electric arc can't cease arc voluntarily, the overvoltage that arc reignition produces jeopardizes the insulation that perfects phase and can cause two-phase short-circuit fault, and the accident that causes power distribution network for single phase ground fault is of common occurrence, causes insulation breakdown, sleeve pipe bursts, line to line fault, even causes the switch cubicle " baked wheaten cake is operated " of transformer station; Existing for this reason isolated neutral electric power system, usually adopt grounding through arc at neutral point, inductive current by arc suppression coil compensates capacitive earth current, limit the capacitive earth current of electrical network, rules DL 620-1997 " overvoltage protection of alternating-current electric device and insulation coordination " has carried out specified in more detail to the qualification capacitive earth current of electrical network: " 3kV～10kV is the system of direct coupled generator and 35kV, 66kV system not; when the single phase ground fault capacitance current is no more than following numerical value, should adopt earth-free mode; When needing under earth-fault conditions, move again above following numerical value, should adopt the grounding through arc mode: the system that the overhead transmission line of 3kV～10kV armored concrete or metal shaft tower constitutes and all 35kV, 66kV system, 10A "; its aim is to guarantee the system stability safe operation, satisfies the demand of power supply reliability.
Particularly 10～66kV grade power grids fast development of isolated neutral network system in recent years, arc suppression coil design pre-allowance compensation capacity can't satisfy the capacitive earth current growth; In addition in isolated neutral system because capacitive earth current surpasses the arc suppression coil compensation capacity, make many arc suppression coils that in electrical network, put into operation be in the undercompensation running status for a long time, very easily cause the system resonance overvoltage when system operation mode changes, this has brought hidden danger also for system safety stable operation; Depend merely on the compensation capacity of arc suppression coil of continuous adjustment transformer station and the development that the compensation range way can't adapt to electrical network, need new methods to attempt having broken through traditional building-out capacitor current-mode, the arc suppression coil compensation capacity that solves transformer station's design lags behind the increase of system capacitive current, eliminates safe operation of electric network hidden danger.
About dispersion compensation capacitance current transformer, domestic and international many enterprises, scientific research institution are studied for this reason, similar achievement are also arranged for example at present: Chinese patent communique publication: " application number: 95229098.7, title: three use grounding transformer "; " application number: 99235580.X, title: the dry-type earth transformer of band arc suppression coil "; " application number: 200520071473.7; title: zero sequence short circuit high resistance grounding transformer type arc suppression coil " its design feature is: arc suppression coil and grounding transformer, with being loaded on one the three core five-column conjugated type iron core or four column iron cores and one, these inventions have shortcoming: they are mainly used with transformer station and carry out centralized compensation system capacitive earth current, the electromagnetism of arc suppression coil and grounding transformer interacts in addition, arc suppression coil is once existing problems directly influence the normal operation of transformer, system operation mode changes, when needing to break away from operation, can't guarantee the secondary power supply.
Summary of the invention
The utility model provides a kind of medium voltage network dispersion compensation capacitance current transformer, to solve the increase-volume problem of medium-pressure electricity supply system neutral ungrounded supply system arc suppression coil, the problem low with the power supply reliability of isolated neutral electrical network, the technical scheme that the utility model is taked is: comprise tortuous coiling transformer, dead earth inductance and magnetic isolation plate; Magnetic isolation plate is between complications coiling transformer and dead earth inductance, upper and lower two sections of windings of tortuous coiling transformer for each phase winding is divided into, every section umber of turn equates, the epimere winding of a phase and another hypomere winding anti-series mutually for becoming a phase, wherein epimere winding A, B, C draw the high pressure three-phase leading-out terminal as transformer, and the hypomere winding couples together to draw with fixing earthing reactance X as neutral point N and is connected.
The utility model is one and has the certain capacitive earth current function of compensation, the three-phase transformer that power supply capacity is arranged again, from the flow direction of zero-sequence current as can be seen, because the winding coil winding of two sections is reverse, when zero-sequence current equates to pass through, the zero sequence magnetic potential that makes core limb of cancelling out each other is approximately zero, therefore the zero sequence reactance of winding also is approximately zero, when neutral point is connected with the ground connection inductance of fixing, when electrical network generation single phase ground fault, zero-sequence current will flow through smoothly, the inductance current of fixing earth inductor can direct compensation power-to-ground capacitance electric current, and then realize reducing reducing the generation and the development of electric arc by the fault point earth current, prevent arc grounding voltage.
Because magnetic isolation plate is arranged, guaranteed that tortuous coiling transformer and dead earth inductance are relatively independent, electromagnetism is independent of each other, and compensating inductance is not once existing problems influence the normal operation of transformer, system operation mode changes, and the connection that disconnects X, N as required can be out of service with compensating inductance.
For dispersion compensation capacitive earth current transformer because electrical network keeps three-phase line of symmetry voltage, primary side obtains the positive sequence electromotive force from power supply, forward-order current then produces positive sequence magnetic flux and positive sequence electromotive force, magnetic flux is also responded to the positive sequence electromotive force in secondary winding, therefore secondary side can be powered for low-voltage customer, owing to have magnetic isolation plate tortuous coiling transformer and dead earth inductance relatively independent, dropping into and withdraw from the dead earth inductance does not influence the power supply of secondary side low-voltage customer.
The utility model has overcome the deficiencies in the prior art, compensating inductance and grounding transformer are united two into one, carrying out inside by magnetic isolation plate simultaneously separates, guaranteed that they are relatively independent, electromagnetism is independent of each other, and compensating inductance is not once existing problems influence the normal operation of transformer, and system operation mode changes, as required can compensating inductance is out of service, guaranteed the secondary power supply reliability.Beneficial effect: install simply, need not debugging, small investment, take up an area of for a short time, use flexibly, non-maintaining; Circuit puts into operation and withdraws from the dispersion compensation capacitance current transformer that is installed on the circuit and drop into thereupon and withdraw from, also can compensating inductance is directly out of service according to system's operation needs, the realization electrical network changes, compensation changes thereupon, simple to operate, the real-Time Compensation capacitive earth current has fundamentally improved the power supply reliability of electrical network.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Comprise tortuous coiling transformer 1, dead earth inductance 2 and magnetic isolation plate 3; Magnetic isolation plate is between complications coiling transformer and dead earth inductance, upper and lower two sections of 1 windings of tortuous coiling transformer for each phase winding is divided into, every section umber of turn equates, the epimere winding of a phase and another hypomere winding anti-series mutually for becoming a phase, wherein epimere winding A, B, C draw the high pressure three-phase leading-out terminal as transformer, and the hypomere winding couples together to draw with fixing earthing reactance X as neutral point N and is connected.
Claims (1)
1. a medium voltage network dispersion compensation capacitance current transformer is characterized in that: comprise tortuous coiling transformer, dead earth inductance and magnetic isolation plate; Magnetic isolation plate is between complications coiling transformer and dead earth inductance, upper and lower two sections of windings of tortuous coiling transformer for each phase winding is divided into, every section umber of turn equates, the epimere winding of a phase and another hypomere winding anti-series mutually for becoming a phase, wherein epimere winding A, B, C draw the high pressure three-phase leading-out terminal as transformer, and the hypomere winding couples together to draw with fixing earthing reactance X as neutral point N and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202573255U CN201820605U (en) | 2010-07-14 | 2010-07-14 | Disperse-compensation capacitance-current transformer for medium voltage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202573255U CN201820605U (en) | 2010-07-14 | 2010-07-14 | Disperse-compensation capacitance-current transformer for medium voltage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201820605U true CN201820605U (en) | 2011-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202573255U Expired - Lifetime CN201820605U (en) | 2010-07-14 | 2010-07-14 | Disperse-compensation capacitance-current transformer for medium voltage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201820605U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489594A (en) * | 2013-09-25 | 2014-01-01 | 三变科技股份有限公司 | Traction-type transformer coil structure |
| CN106026069A (en) * | 2016-07-18 | 2016-10-12 | 武汉大学 | Distribution network capacitive current distribution compensation method |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
-
2010
- 2010-07-14 CN CN2010202573255U patent/CN201820605U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489594A (en) * | 2013-09-25 | 2014-01-01 | 三变科技股份有限公司 | Traction-type transformer coil structure |
| CN106026069A (en) * | 2016-07-18 | 2016-10-12 | 武汉大学 | Distribution network capacitive current distribution compensation method |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JILIN PROV. POWER SCIENCE INST. CO., LTD. STATE EL Free format text: FORMER OWNER: JILIN PROV. POWER SCIENCE INST. CO., LTD. Effective date: 20120921 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120921 Address after: 130021 Jilin City, Changchun province people's street, No. 4433 Patentee after: Electric Power Research Institute of Jilin Electric Power Company Patentee after: Jilin Academy of Electric Power Science Patentee after: State Grid Corporation of China Address before: 130021 Jilin City, Changchun province people's street, No. 4433 Patentee before: Electric Power Research Institute of Jilin Electric Power Company Patentee before: Jilin Academy of Electric Power Science |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110504 |