CN203871139U - Structure for restraining low-voltage winding neutral point potential from drifting - Google Patents
Structure for restraining low-voltage winding neutral point potential from drifting Download PDFInfo
- Publication number
- CN203871139U CN203871139U CN201320758331.2U CN201320758331U CN203871139U CN 203871139 U CN203871139 U CN 203871139U CN 201320758331 U CN201320758331 U CN 201320758331U CN 203871139 U CN203871139 U CN 203871139U
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- neutral point
- winding
- low
- voltage winding
- point potential
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- 238000004804 winding Methods 0.000 title claims abstract description 50
- 230000007935 neutral effect Effects 0.000 title claims abstract description 32
- 230000000452 restraining effect Effects 0.000 title abstract 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
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Abstract
A structure for restraining a low-voltage winding neutral point potential from drifting comprises a high-voltage winding, a low-voltage winding and a balancing winding. The structure for restraining the low-voltage winding neutral point potential from drifting specifically includes one of the following points: (1) if the low-voltage winding neutral point potential has a lead-out end, a Y-connection winding neutral point of the low-voltage winding is grounded; (2) if the low-voltage winding neutral point potential does not have a lead-out end, the grounded point of the balancing winding is unconnected and is grounded after being in serial connection with an arrester. The structure is simple, practical, easy to rectify and efficient, saves energy, eliminates drifting of the low-voltage winding neutral point potential after a transformer with the balancing winding is put into operation, and avoids the situation that power transmission lines, the transformer, a mutual inductor, the arrester and other power equipment are damaged due to three-phase voltage unbalance caused by the neutral point potential.
Description
Technical field
The utility model relates to power transformer technical field, is specifically related to a kind of structure for the inhibition low pressure winding neutral point potential drifting with balance winding transformer.
Background technology
Existing in 220 kilovolts of autotransformers of system interconnection transformer, its connection is generally YNa0yn0+d, transformer connection also conventional YNyn0+d for some 500 kilovolts of Converter Station, these transformer device structure features are that Working winding is star (Y) connection, in order to allow transformer can obtain the sinusoidal magnetic flux corresponding with applying voltage waveform, the distribution channel that is generally used for providing triple harmonic current at the inner balance winding that increases delta connection of transformer, makes transformer in free excited state.This winding is not generally with live load, draws by single sleeve pipe or by two sleeve pipes.
In the time that transformer moves, because low pressure winding is 35kV and following electric pressure, neutral point is conventionally earth-free or through grounding through arc, and in balance winding triangle, only has one point earth, typical case connects signal as shown in Figure 2, now drift about because the capacitive coupling effect between winding makes low-pressure side neutral point current potential, thereby cause low-pressure side three phase-to-ground voltages that in various degree asymmetric occurs.As shown in Figure 3.The imbalance of three-phase voltage being caused by neutral point current potential will form serious threat to power equipments such as power transmission line, transformer, instrument transformer, lightning arresters, must eliminate in time.
Summary of the invention
Technical problem to be solved in the utility model is: after putting into operation for prior art band balance winding transformer, the phenomenon of drift in various degree occurs low pressure neutral point current potential, and a kind of structure that suppresses low pressure winding neutral point potential drifting is proposed, the threat that the imbalance of three-phase voltage that elimination is caused by neutral point current potential forms power equipments such as power transmission line, transformer, instrument transformer, lightning arresters, ensures power equipment safety reliability service.
The technical solution adopted in the utility model is:
A kind of structure that suppresses low pressure winding neutral point potential drifting, comprise high pressure winding, low pressure winding and balance winding, the concrete structure that suppresses low pressure winding neutral point potential drifting is: when low pressure winding neutral point has exit, the Y of low pressure winding is connect to winding neutral ground.
The utility model is simple in structure, practical, energy-conservation, efficient, rectification easily, eliminate the low pressure neutral point potential drifting after putting into operation with balance winding transformer, avoided the infringement to power equipments such as power transmission line, transformer, instrument transformer, lightning arresters of the imbalance of three-phase voltage that caused by neutral point current potential.Application of the present utility model has successfully solved the problem of station, 500 kilovolts, Yue Loong station, Sichuan transformer low voltage neutral point potential drifting, has avoided the scene of station, Yue Loong station transformer to hang cover and rectification lead-in wire, saves the hundreds thousand of units of rectification expense.
Brief description of the drawings
Fig. 1 is the utility model embodiment 1 principle schematic;
Fig. 2 is background technology principle schematic;
Fig. 3 is background technology coordinate analysis figure.
In Fig. 1, Fig. 2,1-high pressure winding, 2-low pressure winding, 3-balance winding, 4-neutral ground; In Fig. 3, the winding neutral point that OS-is virtual, low pressure winding neutral point after the actual drift of O-.
Embodiment
Embodiment 1 shown in Figure 1, the present embodiment is that low pressure neutral point has exit, thereby as long as the Y that is Working winding by low pressure winding connects winding neutral ground, just can suppress low pressure winding neutral point potential drifting.
Claims (1)
1. one kind is suppressed the structure of low pressure winding neutral point potential drifting, comprise high pressure winding, low pressure winding and balance winding, it is characterized in that, the concrete structure that suppresses low pressure winding neutral point potential drifting is: when low pressure winding neutral point has exit, the Y of low pressure winding is connect to winding neutral ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320758331.2U CN203871139U (en) | 2013-11-27 | 2013-11-27 | Structure for restraining low-voltage winding neutral point potential from drifting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320758331.2U CN203871139U (en) | 2013-11-27 | 2013-11-27 | Structure for restraining low-voltage winding neutral point potential from drifting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203871139U true CN203871139U (en) | 2014-10-08 |
Family
ID=51652064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320758331.2U Expired - Lifetime CN203871139U (en) | 2013-11-27 | 2013-11-27 | Structure for restraining low-voltage winding neutral point potential from drifting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203871139U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185555A (en) * | 2015-11-05 | 2015-12-23 | 广西柳州特种变压器有限责任公司 | Main boosting transformer for wind farm |
| CN107230967A (en) * | 2017-06-07 | 2017-10-03 | 国网山西省电力公司电力科学研究院 | voltage transformer secondary neutral point potential drift monitoring method |
-
2013
- 2013-11-27 CN CN201320758331.2U patent/CN203871139U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185555A (en) * | 2015-11-05 | 2015-12-23 | 广西柳州特种变压器有限责任公司 | Main boosting transformer for wind farm |
| CN107230967A (en) * | 2017-06-07 | 2017-10-03 | 国网山西省电力公司电力科学研究院 | voltage transformer secondary neutral point potential drift monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |
|
| CX01 | Expiry of patent term |