CN2463935Y - Lighning protection distribution transformer with lightning protection coil - Google Patents
Lighning protection distribution transformer with lightning protection coil Download PDFInfo
- Publication number
- CN2463935Y CN2463935Y CN 00239429 CN00239429U CN2463935Y CN 2463935 Y CN2463935 Y CN 2463935Y CN 00239429 CN00239429 CN 00239429 CN 00239429 U CN00239429 U CN 00239429U CN 2463935 Y CN2463935 Y CN 2463935Y
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- Prior art keywords
- lightning
- distribution transformer
- lightning protection
- low
- voltage
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- Expired - Fee Related
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Abstract
The utility model adds a lightning protection inductance coil between a neutral point of a low-voltage winding of a distribution transformer and a grounding body, or between the neutral point of the low-voltage winding and a transformer casing, or the neutral point of the low-voltage winding, the casing and the grounding body. The utility model uses the characteristic that the impedance of the lightning protection inductance coil rapidly rises under the action of the high frequency impulse voltage of lightning to eliminate positive and inverse transforming over-voltage so as to achieve lightning protection effects. Except the effective prevention of the distribution transformer from damages by lightning, the utility model effectively prevents low voltage electric equipment from lightning. The utility model has the advantages of low cost and good lightning protection effects.
Description
The present utility model relates to a kind of lightning protection distribution transformer.
For a long time, traditional distribution transformer in use adopts the protected mode of high-voltage arrester earth terminal and low pressure winding neutral point and 3 common grounds of transformer case owing to lightning protection.On the high and low pressure circuit or near thunderbolt will produce " just, inverse transformation overvoltage ", the overvoltage of its generation exceeds the impulse withstand voltage several times of distribution transformer.So distribution transformer very easily damages because of being struck by lightning, according to statistics, distribution transformer is struck by lightning, and the spoilage whole nation is average to surpass 1%, and area with more lightning activities is up to about 10%, and bring the direct economic loss of billions of units to country every year.Indirect loss is even more serious.So a kind of novel distribution transformer that damages because of thunderbolt that can prevent effectively of design has great significance to reliability and the fail safe that improves power supply.
The object of the invention provides a kind of new lightning protection distribution transformer, it can prevent effectively that distribution transformer from damaging because of thunderbolt, simultaneously it can decay widely from the high-pressure side through earth electrode invade to low-pressure side lightning wave, thereby the power consumption equipment thunderbolt spoilage of low pressure 380v (220v) side is reduced widely.
Concrete grammar of the present invention is: be connected a resistance thunder and lightning sense coil between distribution transformer low pressure winding neutral point, shell and earth electrode, transformer case is connected with low pressure winding neutral point afterwards and hinders thunder and lightning sense coil one end and be connected, hinder the thunder and lightning sense coil other end and be connected with earth electrode.This resistance thunder and lightning sense coil also can be connected between distribution transformer low pressure winding neutral point and the shell.Before adopting during a kind of method.The distribution transformer shell needs and the crossbeam insulation of laying distribution transformer.
When the high-tension line thunderbolt, the lightning arrester action of distribution transformer high-pressure side, the high-frequency percussion voltage that produces on earth resistance through the lightning current of earth electrode need get on through the low-voltage coil that inductance coil just can be added to distribution transformer, because the surge voltage frequency is very high, inductance coil will present very high impedance, and surge voltage is decayed soon.Theoretical Calculation and evidence can be passed to earth resistance the thunder surge voltage on the distribution transformer low pressure winding, are reduced to below 10%.
During the low-voltage circuit thunderbolt, according to our Theoretical Calculation and field operation experiences, the direct transform overvoltage significantly reduces when the impact impedance (comprising earth resistance) that connects low pressure winding neutral point place raises.
So this inductance coil can be eliminated the inverse transformation overvoltage, can eliminate the direct transform overvoltage again.When normal operation, because the frequency of operating voltage is 50HZ, very low, the impedance of this inductance coil is very little.Can ignore, can not exert an influence normal operation.
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 be distribution transformer low pressure winding neutral point shell with earth electrode between the connect structural representation of an inductance coil.
Inductance coil can be fixed on the transformer case, should guarantee the safe distance with charged position.Also can be fixed on outside the transformer body.Connect with insulated conductor.The distribution transformer shell needs and the crossbeam insulation is installed.
This frame mode can be reequiped the distribution transformer that has moved.
Fig. 2 is the frame mode of an inductance coil of connecting between distribution transformer low pressure winding neutral point and shell.This frame mode.Transformer case does not need and the crossbeam insulation is installed.Resistance thunder and lightning sense coil is installed in the transformer tank.
Fig. 3 still is that inductance coil is installed on outside the transformer tank by the frame mode of the inductance coil of connecting between distribution transformer low pressure winding neutral point and shell.One end links to each other with low pressure winding neutral point through transformer low voltage, the other end, and the other end is connected with earth electrode with transformer case through insulated conductor.
The utility model can be eliminated the superpotential resistance thunder and lightning of positive inverse transformation sense coil 1 with general transformer difference for containing one.
Resistance thunder and lightning sense coil can adopt various forms of inductance coils, routine air core coil or iron-core coil
Resistance thunder and lightning sense coil should satisfy overcurrent and requirement of withstand voltage.
Low-voltage equipment damages that to have more than 85% be to be caused by the high pressure lightning wave owing to high pressure can be invaded the lightning impulse voltage decay of secondary network.So also can protect low-voltage equipment effectively.
The utility model is applicable to the 6-10KV distribution transformer, has good lightning protection properties, both can protect distribution transformer to avoid thunderbolt and damage, and can protect low voltage equipment again, and it is low to have cost in addition.And can transform the distribution transformer that has moved, thereby be worthy to be popularized very much.
Claims (4)
1, a kind of novel lightning protection distribution transformer with resistance thunder coil is characterized in that being connected one between distribution transformer low pressure winding neutral point and earth electrode hinders thunder and lightning sense coil.
2, novel lightning protection distribution transformer according to claim 1 is characterized in that: or between low pressure winding and transformer case, be connected a resistance thunder and lightning sense coil, can be installed in the transformer-cabinet, also can be installed in outside the transformer tank.
3, novel lightning protection distribution transformer according to claim 1 is characterized in that: or at low pressure winding neutral point, be connected a resistance thunder and lightning sense coil between shell and the earth electrode.
4, novel lightning protection distribution transformer according to claim 1, its inductance value of resistance thunder and lightning sense coil that is connected between low pressure winding neutral point and the earth electrode is advisable at 100 μ H～2000 μ H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239429 CN2463935Y (en) | 2000-09-13 | 2000-09-13 | Lighning protection distribution transformer with lightning protection coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239429 CN2463935Y (en) | 2000-09-13 | 2000-09-13 | Lighning protection distribution transformer with lightning protection coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2463935Y true CN2463935Y (en) | 2001-12-05 |
Family
ID=33600286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00239429 Expired - Fee Related CN2463935Y (en) | 2000-09-13 | 2000-09-13 | Lighning protection distribution transformer with lightning protection coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2463935Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801149A (en) * | 2012-08-14 | 2012-11-28 | 合肥南南电力保护设备有限公司 | Wire inlet protector |
| CN102904231A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Insulation protection device for preventing high-voltage counterattack of ground potential |
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
-
2000
- 2000-09-13 CN CN 00239429 patent/CN2463935Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801149A (en) * | 2012-08-14 | 2012-11-28 | 合肥南南电力保护设备有限公司 | Wire inlet protector |
| CN102904231A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Insulation protection device for preventing high-voltage counterattack of ground potential |
| CN102904231B (en) * | 2012-10-24 | 2016-07-06 | 深圳市雷博斯科技有限公司 | Prevent isolating and protecting device and isolation protective circuit thereof that earth potential high pressure strikes back |
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |