CN1015286B - Anti-thunderstruck device for distribution transformer - Google Patents
Anti-thunderstruck device for distribution transformerInfo
- Publication number
- CN1015286B CN1015286B CN 89105752 CN89105752A CN1015286B CN 1015286 B CN1015286 B CN 1015286B CN 89105752 CN89105752 CN 89105752 CN 89105752 A CN89105752 A CN 89105752A CN 1015286 B CN1015286 B CN 1015286B
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- CN
- China
- Prior art keywords
- winding
- transformer
- balance
- low
- discharging gap
- 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.)
- Expired
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Abstract
The present invention relates to an anti-thunderstruck device for a distribution transformer, which is characterized in that a group of balancing windings of which the phase number is the same as that of a low-voltage side winding but the winding direction is reverse to that of the low-voltage side winding are added to the iron core of a transformer; a gap discharge box is additionally arranged out of the transformer, an indicator lamp, a hollow inductance magnetic quenching coil and a high resistance carbon rod are connected in series and then connected in parallel at both ends of a discharge gap, and the top end and the tail end of each balancing winding are connected to both of the two ends of the discharge gap in series to form a loop. In this way, positive and negative transformation superpotential amplitude values caused by that electric waves invade high voltage circuits and low voltage circuits when the transformer is struck by lightning can be limited within a certain range so as to protect the normal operation of the distribution transformer without extra circuit loss.
Description
The present invention relates to a kind of distribution transformer that has lightning proof, particularly have the Y/Y of lightning proof
o-12 distribution transformers.
Current, increase along with distribution network power supply area, power supply unit rolls up, the chance that causes distribution transformer to be struck by lightning is more, except that the thunderbolt of direct thunder, the voltage that to also have a reason be exactly distribution transformer causes suffering lightning wave to invade high-pressure side or low-pressure side just, inverse transformation overvoltage and cause transformer high-voltage lateral coil insulation breakdown and damage.A general area thunderbolt year spoilage is 1%, and therefore indivedual multi-thunder area thunderbolt year spoilages are a kind of serious threats to distribution transformer up to 30%.At present both at home and abroad about this Y/Y
oThe anti-lightning strike problem of-12 distribution transformers is not also than effective measures.As the invention (patent No. 86100489) of U.S. Kuhlman Corporation (US) 2565 West Maple Road, Troy, Michigan 48084, U.S.A. of applying for a patent in China, adopt the conductive shield of making electric coupling with transformer lead to protect toroidal transformer not to be subjected to the infringement of transient voltage.Domestic present use be at Y/Y
oBe installed at the zinc oxide arrester without gaps that has improved on the MY31 type zinc oxide varistor on-12 distribution transformer low-pressure side circuits, the lightning distribution transformer spoilage can be reduced to 0.7% by year 1.4%, but, it is promoted the use of be subjected to certain restriction because the selectivity characteristic of Zinc-oxide piezoresistor and MY31 type zinc oxide arrester fuse fuse easily in the strong area of lightening activity and the fuse of MY31 type zinc oxide arrester inside is inconvenient in distribution transforming detection in service.
The purpose of this invention is to provide the Y/Y that a kind of cost is low, parameter is easily adjusted, adaptability is strong, easy to detect
oThe distribution transformer of-12 band lightning proofs.
Characteristics of the present invention are at Y/Y
oInstall additional on the iron core of-12 distribution transformers one group identical with the low pressure winding number of phases, around to opposite balance winding, this balance winding can be contained between iron core and the low pressure winding, also can be contained between low, the high pressure winding or the high pressure winding outside; At the external discharging gap box that installs additional of transformer, discharging gap two ends and balance winding first and last end are linked constitute a loop; One indicator light be connected in parallel on the discharging gap two ends after an air core inductor blowout coil and a high resistance carbon-point are connected so that whether discharging gap is normally reached fusible link monitor by indicator light.Like this, when lightning wave during from high-pressure side three-phase afferent echo, lightning current flows through earth resistance and produces pressure drop by the high-pressure side lightning arrester; This pressure drop is added in and makes it flow through induction lightening stream on the low pressure winding, and produces a magnetic flux variable φ in iron core
' L; Because electrostatic component also makes the terminal current potential of the balance winding on the iron core raise, when terminal current potential is elevated to the gap discharge voltage that balance winding first and last end installed, to in the balance winding, flow through induction lightening stream, and generation one and above-mentioned magnetic flux variable φ in iron core
' LThe flux component φ that direction is opposite
' PThereby, the electromagnetic induction component in the iron core is reduced, make high pressure obtain restriction around the amplitude of neutral point overvoltage.When lightning wave during, will in the low pressure winding, flow through a lightning current, and in iron core, produce a magnetic flux variable φ from low-pressure side three-phase afferent echo
" LMake to produce in high-pressure side winding and the balance winding and impact the magnetic induction high voltage, because high pressure winding neutral point is unearthed, so not having the induced current of impact in the high pressure winding passes through, when the magnetic induction overvoltage of balance winding is elevated to the gap discharge voltage that is serially connected in balance winding first and last end, then in the balance winding, flow through one and impact induced current, and generation one and magnetic flux variable φ in iron core
" LThe magnetic flux variable φ that direction is opposite
" PMake resultant flux component minimizing in the iron core, the high-pressure side coil neutral point voltage amplitude that the voltage direct transform is caused obtains restriction, and when distribution transformer normally moves, in the balance winding power-frequency voltage will be arranged, but fail to reach the discharge voltage value owing to be serially connected in the gap of balance winding first and last end, balance coil is in open-circuit condition, so can in coil, not have power current to pass through, so can not increase distribution loss after installing the balance winding additional.
Fig. 1 is the elementary diagram that installs distribution transformer behind the balance winding additional
Fig. 2 a is the main cutaway view of balance winding at the transformer interior location
Fig. 2 b is the vertical view of balance winding at the transformer interior location
Fig. 3 is the discharging gap circuit diagram
The drawing explanation:
1. transformer core 2. low pressure windings 3. high pressure windings
4. balance winding 5. gap discharge balls 6. fusible links
7. connect lead 8. high resistance carbon-points 9. air core inductor blowout coils
10. indicator light
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 2, balance winding 4 is installed in Y/Y
oBetween-12 distribution transformer high pressure windings 3 and the low pressure winding 2, these balance winding 4 numbers of phases are identical with low pressure winding 2, and around on the contrary, the number of turn of balance winding 4 determines that according to the strong and weak degree of different regions thunder and lightning thunder and lightning is strong, and the number of turn is many, and a little less than the thunder and lightning, the number of turn is few; At the external discharging gap box of laying of transformer, an one high resistance carbon-point 8 and an air core inductor blowout coil 9 and one monitor after the indicator light 10 of balance coil 4 operations is connected and are connected in parallel on the discharging gap two ends, as shown in Figure 1, link with balance winding 4 first and last ends then and constitute a loop.No matter be to cause behind the afferent echo of high-pressure side that the earth resistance pressure drop is increased or the low-pressure side afferent echo, in the low-pressure side winding, all there is the lightning impulse induced current to flow through, its electric current produces one and impacts magnetic flux variable △ φ in iron core
LAnd, impact the induced current loop, so can not form one and △ φ so can not form one in the coil of high-pressure side because high-pressure side coil neutral point is unearthed
LThe flux component that balances each other is therefore at △ φ
LIn iron core, form a magnetizing inrush current, cause that the high-pressure side coil occurs impacting induced voltage, cause high-pressure side coil insulation to be damaged.After installing the balance winding additional, the discharging gap that the balance winding is connected in series is as long as conducting will form one and impact the induced current loop in the balance winding, and a magnetic flux variable of corresponding generation △ φ
PWith △ φ
LBalance each other, thereby make the magnetizing inrush current in the iron core be difficult to form.Whether the indicator light of installing in the discharging gap box is easily normal for detecting the balance winding loop.
Claims (5)
1, a kind of distribution transformer that has lightning proof particularly has the Y/Y of lightning proof
0-12 distribution transformers, constitute by high-pressure side lightning arrester, coil windings and discharging gap box, it is characterized in that on transformer core, installing additional a balance winding, this balance winding is identical with the low pressure winding number of phases, around on the contrary, the discharging gap two ends in its first and last end discharging gap box external with being positioned over transformer connect and constitute a loop.
2, device according to claim 1 is characterized in that the balance winding can be between transformer core and low pressure winding.
3, device according to claim 1 is characterized in that the balance winding can be between low pressure winding and high pressure winding.
4, device according to claim 1 is characterized in that the balance winding can be in the outside of high pressure winding.
5, device according to claim 1 is connected in parallel on the discharging gap two ends after it is characterized in that in the discharging gap box high resistance carbon rod and an air core inductor blowout coil and an indicator light being connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105752 CN1015286B (en) | 1989-08-12 | 1989-08-12 | Anti-thunderstruck device for distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105752 CN1015286B (en) | 1989-08-12 | 1989-08-12 | Anti-thunderstruck device for distribution transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041845A CN1041845A (en) | 1990-05-02 |
| CN1015286B true CN1015286B (en) | 1992-01-01 |
Family
ID=4856401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89105752 Expired CN1015286B (en) | 1989-08-12 | 1989-08-12 | Anti-thunderstruck device for distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015286B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110152223B (en) * | 2019-06-21 | 2024-03-29 | 中国科学技术大学 | Extra-high voltage converter transformer protection structure |
| CN113782321A (en) * | 2021-09-26 | 2021-12-10 | 云南电网有限责任公司红河供电局 | Method and device for restraining forward and reverse transformation overvoltage of distribution transformer |
| CN114336562A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司 | Transformer lightning overvoltage protection device |
-
1989
- 1989-08-12 CN CN 89105752 patent/CN1015286B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1041845A (en) | 1990-05-02 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| 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 |