CN206489960U - Three-phase electricity magnetic-type resonance free voltage transformer wiring group - Google Patents
Three-phase electricity magnetic-type resonance free voltage transformer wiring group Download PDFInfo
- Publication number
- CN206489960U CN206489960U CN201720198905.3U CN201720198905U CN206489960U CN 206489960 U CN206489960 U CN 206489960U CN 201720198905 U CN201720198905 U CN 201720198905U CN 206489960 U CN206489960 U CN 206489960U
- Authority
- CN
- China
- Prior art keywords
- coils
- wiring
- phases
- voltage transformer
- tail end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of three-phase electricity magnetic-type resonance free voltage transformer wiring group, including a three-phase coil, secondary side measurement loop, secondary side measurement protective loop, secondary side residual voltage loop increases b in the wiring of falling V in the secondary measurement loop1N windings, balance threephase load；Wiring group is：Three-phase coil wiring：The A termination A phases of AB coils, the x ends of AB coils are that the A ends of tail end connection BC coils are followed by B phases, and the x ends of BC coils are that tail end connects C phases；The A ends of BN coils are connected with B, the tail end x ends ground connection of BN coils.The utility model wiring principle determines the uniqueness of three-phase electricity electromagnetic type voltage transformer resonance free wiring group, and insulation system applications at different levels can be met while resonance is not produced.
Description
Technical field
The utility model is related to voltage transformer field, refers specifically to a kind of three-phase electricity magnetic-type resonance free voltage transformer wiring
Group.
Background technology
Electric insulation system generally uses the electromagnetic potential transformer of wiring group, principle such as Fig. 4 in world wide.Three
Phase power supply A, B, C are the insulation systems of no neutral ground.And voltage transformer neutral point N must be grounded.So, N point current potentials
It is easy to drift.When electric power system singlephase earth fault, N point voltage drifts, remaining two-phase voltage, which is increased to, to be more thanTimes.This
When produce zero-sequence current, voltage transformer magnetic circuit enters saturation state, and hurried diminish of impedance is connected with the equivalent formation of ground capacity
Resonance, produces overvoltage.Cause power system insulation breakdown accident.
Patent No. ZL200920143886X, it is entitled：Resonance free Integral three-phase voltage transformer develops into product
Afterwards, played a role among the operation of input Northwest Grid to eliminating resonance overvoltage, long-term hanging net operation proves, this connect
The operation of line group also needs to perfect.
Utility model content
The utility model provides a kind of three-phase electricity magnetic-type resonance free voltage transformer wiring group, eliminates resonance overvoltage
Problem, simultaneously, it is determined that the uniqueness of electromagnetic potential transformer resonance free wiring group.
Therefore, the technical scheme that is used of the utility model for：
A kind of three-phase electricity magnetic-type resonance free voltage transformer wiring group, including a three-phase coil, secondary side are measured back
Road, secondary side measurement protective loop, secondary side residual voltage loop increases b in the wiring of falling V in the secondary measurement loop1n
Winding, balances threephase load；Wiring group is：Three-phase coil wiring：The A termination A phases of AB coils, the x ends of AB coils
That is the A ends of tail end connection BC coils are followed by B phases, and the x ends of BC coils are that tail end connects C phases；The A ends of BN coils are connected with B, BN lines
The tail end x ends ground connection of circle；The * ends of three-phase coil and the * ends of secondary coil are Same Name of Ends;Every group of coil correspondence：One
Group primary winding and three groups of secondary coils, to subtract pole principle composition primary circuit and three secondary circuits, the wiring principle is determined
The uniqueness of three-phase electricity electromagnetic type voltage transformer resonance free wiring group.
Secondary side measurement loop of the present utility model reaches after being improved on the basis of the original connection circuit of falling V is " ∧ " wiring
To meeting insulation system applications at different levels.While the electromagnetic potential transformer connection principle of this wiring group（See Fig. 1）AB lines
Circle and BC coils are in parallel with power supply.Impedance due to the internal resistance of source much smaller than AB coils and BC coils, so two coil reactance
Do not produce resonance.And composition it is stable with power supply identical " △ " wiring phase.Only BN coils X ends are grounded, as long as BN lines
The phase voltage born is enclosed to be increased toTimes voltage electromagnetic circuit, which does not enter saturation region, impedance, not to be reduced and increases on the contrary, will not also be sent out
Raw resonance phenomena.
In insulation system in power supply " △ " phase phasor, any one phase is grounded, but the alternate electricity of power phase " △ "
Constant pressure is stable.The zero-sequence current very little of BN phases, i.e. impedance is very big, and series resonant tank is not constituted with ground capacity.This
Resonance overvoltage would not occur for sample transformer.Also the problem of just eliminating resonance overvoltage.
Brief description of the drawings
Fig. 1 is electromagnetic potential transformer elementary diagram of the present utility model；
Fig. 2 is secondary side measurement loop wiring diagram of the present utility model；
Fig. 3 is that secondary side of the present utility model measures protective loop wiring diagram；
Fig. 4 is traditional electromagnetic potential transformer elementary diagram.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings.
Such as Fig. 1,2,3, a kind of three-phase electricity magnetic-type resonance free voltage transformer wiring group, including a three-phase coil, two
Secondary side measurement loop, secondary side measurement protective loop, secondary side residual voltage loop, the V that falls in the secondary measurement loop connects
Increase b in line1N windings, balance threephase load, and wiring group is：Three-phase coil wiring：The A termination A phases of AB coils,
The x ends of AB coils are that the A ends of tail end connection BC coils are followed by B phases, and the x ends of BC coils are that tail end connects C phases；The A ends of BN coils and B
It is connected, the tail end x ends ground connection of BN coils；The * ends of three-phase coil and the * ends of secondary coil are Same Name of Ends;Every group
Coil correspondence：One group of primary winding and three groups of secondary coils, to subtract pole principle composition primary circuit and three secondary circuits, this connects
Line principle determines the uniqueness of three-phase electricity electromagnetic type voltage transformer resonance free wiring group.
In the increased b in secondary measurement loop1N winding load capacity is a1b1Or b1c1/ 5th of ability can meet two
Secondary load is the requirement of delta connection or star-star connection load capacity.
Designing points of the present utility model：
The impedance of the winding of AB, BC two meets Standard by load and required precision, dielectric level is met.BN impedance is pressed
And under 2 times of rated voltages, magnetization operating point does not enter saturation region and meets the water that insulated under normal operation to load and required precision
It is flat to meet national standard earthed voltage transformer requirement.So electrical sheet choosing >=2.25T silicon steel sheets, could meet requirement.
The sampling observation per batch, with symmetrical three-phase high-voltage power supply, detection " △ " and " Y " wiring load precision is consistent with nameplate.
Whole world power supply network uses isolated neutral system using two big systems of neutral ground and neutral insulation, China.
Isolated neutral system has many good qualities.But after system becomes huge, traditional YD/ydThe electromagnetic type electricity of -12 wiring groups
There is incompatible, generation resonance phenomena in pressure transformer.China is solved using many methods, is produced little effect.It is new using this practicality
The voltage transformer of type production will not produce resonance phenomena.Northwest Grid hanging net operation is most long existing 10 years, and operative practice is proved
Do not produce resonance.None damage of safe operation more than 200, none produces resonance overcurrent and resonance overvoltage.This more than 200
Platform set is all that each transformer station is iteratively produced resonance phenomena, is then more if I were you controlled comprehensively after the resonance free voltage transformer of company's research and development
Resonance problems are managed.
Resonance problems are tormented power industry decades, and management is high-rise always it has been proposed that insulation system is transformed into ground connection system
System.The East European countries are added after European Union, and European Union's technology of paying the bill out completes transformation.But China is a big country, and improvement expenses will be day
Literary numeral.The electricity charge of current China are also the first in the world.So the decision-making of transformation is difficult!According to utilization and extention the utility model
The nothing of production wipes the voltage transformer that shakes, and every Transfomer Substation Reconstruction takes 100,000 yuan or so.Inverted insulation system is than ground connection system
System is more superior, more economical.So change stiver is done great thing, and ground such a to China is big, net is big, electricity consumer economy is not had more than needed also
In the case of, this utility model innovation is even more the goodies true that China needs.Can to the money that industry is saved to country
It can be expressed with astronomical figure.Industry is benefited, and it is the act of national strong victory that the common people, which are benefited,.
Claims (1)
1. a kind of three-phase electricity magnetic-type resonance free voltage transformer wiring group, including a three-phase coil, secondary side measurement loop,
Secondary side measures protective loop, secondary side residual voltage loop, it is characterised in that：The wiring of falling V in the secondary measurement loop
Middle increase b1N windings, balance threephase load；Wiring group is：Three-phase coil wiring：The A termination A phases of AB coils, AB
The x ends of coil are that the A ends of tail end connection BC coils are followed by B phases, and the x ends of BC coils are that tail end connects C phases；The A ends of BN coils and B phases
Connection, the tail end x ends ground connection of BN coils；The * ends of three-phase coil and the * ends of secondary coil are Same Name of Ends;Every group of line
Circle correspondence：One group of primary winding and three groups of secondary coils, to subtract pole principle composition primary circuit and three secondary circuits, the wiring
Principle determines the uniqueness of three-phase electricity electromagnetic type voltage transformer resonance free wiring group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198905.3U CN206489960U (en) | 2017-03-02 | 2017-03-02 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198905.3U CN206489960U (en) | 2017-03-02 | 2017-03-02 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206489960U true CN206489960U (en) | 2017-09-12 |
Family
ID=59762991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720198905.3U Active CN206489960U (en) | 2017-03-02 | 2017-03-02 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206489960U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106783098A (en) * | 2017-03-02 | 2017-05-31 | 国网甘肃省电力公司兰州供电公司 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
-
2017
- 2017-03-02 CN CN201720198905.3U patent/CN206489960U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106783098A (en) * | 2017-03-02 | 2017-05-31 | 国网甘肃省电力公司兰州供电公司 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kalair et al. | Comparative study of HVAC and HVDC transmission systems | |
| Wang et al. | Efficient grounding for modular multilevel HVDC converters (MMC) on the AC side | |
| CA2567519A1 (en) | Method and equipment for the protection of power systems against geomagnetically induced currents | |
| Wang et al. | Research status and prospects of the half-wavelength transmission lines | |
| CN204390889U (en) | Scott balancing transformer | |
| Ray | Electrical Power Systems: Concept, Theory and Practice | |
| CN104617583A (en) | Mixed railway power quality control system based on multifunctional balanced transformer | |
| Palanisamy et al. | Basic Electrical and Instrumentation Engineering | |
| CN206489960U (en) | Three-phase electricity magnetic-type resonance free voltage transformer wiring group | |
| Liu et al. | Study of four-phase power transmission systems | |
| CN203746656U (en) | Three-phase anti-resonance voltage transformer | |
| Li et al. | Research on effects of transformer DC bias on negative sequence protection | |
| Söder | Static Analysis of Power Systems | |
| CN203813216U (en) | 10 kV ring network power distribution station | |
| CN110517873B (en) | Traction-compensation transformer | |
| CN102709045A (en) | Combined mutual inductor | |
| Kang et al. | Analysis on the impact of geomagnetic storm on reactive power and voltage in extrahigh voltage power grid | |
| CN205753426U (en) | Electric power compensation system based on TSC | |
| CN202633020U (en) | Combined transformer | |
| CN203813220U (en) | 10 kV switching station | |
| Patel et al. | Design and operational constraints of NEA+ 800kV, 6000MW UHVDC bipolar system | |
| Rioual et al. | Energization of step-up transformers for wind-farms: modeling and its validation by tests performed on a 10 MW site | |
| Nilsson et al. | AC System Characteristics | |
| CN202931209U (en) | Polarity reversal voltage generation device based on DC high-voltage cascade generation circuit | |
| MacLeod et al. | Enhancing system performance by means of HVDC transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |