CN1427428A - High efficiency lightning protection transformer - Google Patents
High efficiency lightning protection transformer Download PDFInfo
- Publication number
- CN1427428A CN1427428A CN 01131872 CN01131872A CN1427428A CN 1427428 A CN1427428 A CN 1427428A CN 01131872 CN01131872 CN 01131872 CN 01131872 A CN01131872 A CN 01131872A CN 1427428 A CN1427428 A CN 1427428A
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- lightning
- filter network
- lightning protection
- coil
- high efficiency
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Abstract
An efficient lightning-protecting transformer is composed of iron core, windings, filter network with one end connected to ground, choking winding parallel to filter network, and shielding layer between primary and secondary windings. Its advantage is high effect and reliability.
Description
Technical field
The present invention relates to a kind of lightning protection electrical installation, especially a kind of high efficiency lightning protection transformer.
Background technology
Present lightning protection transformer mainly is simple screen isolating transformer, this transformer total reflection can occur when lightning wave arrives elementary winding, the lightning voltage multiplication, the overtension that the lightning arrester that is installed in primary coil is born, cause the lightning arrester short circuit easily, and the lightning current of going into ground after the lightning arrester action is very big, because arrester ground point is a same point ground connection with shielding layer grounding point, the online impact current potential that produces is very high on ground in lightning arrester action back, cause the current potential of screen very high, the high potential of screen can be coupled to secondary by the distributed capacitance between screen and secondary winding, the coupling of formation secondary, the mistake high potential is coupled to secondary winding so that isolation effect is very poor.The surge voltage that the primary coil of while transformer bears is very high, and isolating transformer is easy to damage under long-term surge voltage effect.In sum, the shield type isolating transformer is because of existing secondary coupling isolation effect bad; The surge voltage that isolating transformer itself bears is very high, easily causes the isolating transformer insulation damages; Lightning arrester damages easily so that causes short trouble, can not realize round-the-clock lightning protection.
Summary of the invention
Technical problem to be solved by this invention be overcome the weak point in the above-mentioned background technology and provide a kind ofly can realize high efficiency lightning protection transformer non-maintaining, round-the-clock lightning protection, it mainly contains parts such as iron core, coil, filter network and screen, primary coil, secondary coil and choking-winding are arranged on the iron core, the choking-winding two ends are in parallel with the filter network two ends, filter network one end ground connection has screen between primary coil and the secondary coil; Filter network is an above series resonant circuit, and resonant circuit is formed by inductance, capacitances in series.The present invention has following beneficial effect: eliminate the invasion of lightning wave by the complete negative reflection to lightning wave, thereby lightning arrester need not be installed, solved the caused fault of lightning arrester short circuit; Owing to there is not consumable accessory, greatly improved the lightning protection reliability, can realize non-maintaining, round-the-clock lightning protection function.
Description of drawings
Accompanying drawing is embodiments of the invention.
Fig. 1 is an electrical schematic diagram of the present invention.
Fig. 2 is a structural representation of the present invention.
Embodiment
With reference to accompanying drawing, this high efficiency lightning protection transformer is made up of iron core (1), coil (L1, L2, L3), filter network (T) and screen parts such as (2), primary coil (L1), secondary coil (L2) and choking-winding (L3) are arranged on the iron core (1), choking-winding (L3) two ends are in parallel with filter network (T) two ends, filter network (T) end ground connection has the closed loop screen between primary coil (L1) and the secondary coil (L2).Filter network (T) is an above series resonant circuit, and resonant circuit is formed by inductance, capacitances in series.Produce lightning current when lightning voltage affacts primary coil (L1), and get corresponding magnetic flux, wherein DC component makes iron core (1) saturated, and the harmonic component magnetic flux induces electromotive force in choking-winding (L3); Because filter network (T) has the frequency-selecting effect to the harmonic wave of a plurality of concentration of energy, make filter network (T) straight-through, thereby forming loop current, the resistance magnetic flux that this electric current produces balances out the magnetic flux of concentration of energy in the harmonic wave, thereby in secondary coil (L2), will no longer have the induced voltage of thunder and lightning component, DC component makes iron core (1) saturated, more helps eliminating the thunder and lightning harmonic wave induced voltage in the secondary coil (L2).In addition, filter network (T) suitable short circuit when resonance, promptly the equal ground connection in choking-winding (L3) two ends (the direct ground connection of an end, the other end is by filter network (T) ground connection) by impedance conversion, is equivalent to primary coil (L1) coil two ends ground connection simultaneously.Thereby lightning wave produces negative total reflection, the voltage that is added in coil primary coil (L1) is reduced rapidly, as long as follow-up lightning wave amplitude is greater than the lightning wave amplitude that has reflected, the lightning wave input is just arranged in the primary coil (L1), the lightning wave component is just arranged in the magnetic flux, choking-winding (L3) just remains short circuit ground connection, primary coil (L1) is kept ground state, follow-up incoming wave just continues to produce automatically negative reflection, after reflecting back to the lightning wave maximum, follow-up incoming wave just is lowered, and reflected wave is offset fully and reduced to zero.The invasion of lightning wave will stop, and choking-winding this moment (L3) is just opened a way automatically, and reflection process stops.The keeping of reflex depended on the size behind incoming wave and the reflected wave superposition.If greater than zero, reflection is just kept, if zero (not containing less than zero), reflection just stops.For power frequency component,, can not cause the power frequency short circuit because filter network (T) is equivalent to open circuit.Lightning wave can be born reflection automatically after affacting on the isolating transformer, lightning voltage is descended rapidly, therefore lightning arrester can be installed, thereby can solve the lightning-arrest caused fault of short circuit, has improved the reliability of lightning protection, realizes round-the-clock lightning protection.Because negative reflection reduces the lightning voltage on the primary coil (L1) rapidly, and there is not lightning current to flow in the earth mat, therefore screen (2) current potential is zero, has good shield effectiveness, can cut off fully by distributed capacitance from the coupling lightning voltage of primary coil (L1) to secondary coil (L2).Filter network (T) can have a plurality of frequency resonances, and near these frequencies frequency also can carry out quasi-resonance, the harmonic wave part of lightning current in the magnetic flux, all the resistance magnetic flux that produces in the choking-winding (L3) is offset, very ambassador's iron core (1) frequency is saturated to add in the magnetic flux thunder and lightning DC component, so no longer includes the thunder and lightning component in secondary coil (L2) coil voltage.
Claims (2)
1. high efficiency lightning protection transformer, it mainly contains parts such as iron core, coil, filter network and screen, it is characterized in that: primary coil (L1), secondary coil (L2) and choking-winding (L3) are arranged on the iron core (1), choking-winding (L3) two ends are in parallel with filter network (T) two ends, filter network (T) end ground connection, between primary coil (L1) and the secondary coil (L2) screen (2) is arranged, the disconnected place of screen (2) adds insulation.
2. high efficiency lightning protection transformer according to claim 1 is characterized in that: filter network (T) is an above series resonant circuit, and resonant circuit is formed by inductance, capacitances in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01131872 CN1427428A (en) | 2001-12-20 | 2001-12-20 | High efficiency lightning protection transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01131872 CN1427428A (en) | 2001-12-20 | 2001-12-20 | High efficiency lightning protection transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1427428A true CN1427428A (en) | 2003-07-02 |
Family
ID=4670936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01131872 Pending CN1427428A (en) | 2001-12-20 | 2001-12-20 | High efficiency lightning protection transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1427428A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572177B (en) * | 2008-04-30 | 2011-02-02 | 永硕联合国际股份有限公司 | Network transformer as well as network module and electronic device using same |
| CN104064333A (en) * | 2014-06-06 | 2014-09-24 | 合肥鑫伟电力设备有限公司 | Outdoor anti-thunder transformer |
| CN112242791A (en) * | 2019-07-16 | 2021-01-19 | Abb瑞士股份有限公司 | Transformer assembly with intermediate frequency transformer |
-
2001
- 2001-12-20 CN CN 01131872 patent/CN1427428A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572177B (en) * | 2008-04-30 | 2011-02-02 | 永硕联合国际股份有限公司 | Network transformer as well as network module and electronic device using same |
| CN104064333A (en) * | 2014-06-06 | 2014-09-24 | 合肥鑫伟电力设备有限公司 | Outdoor anti-thunder transformer |
| CN112242791A (en) * | 2019-07-16 | 2021-01-19 | Abb瑞士股份有限公司 | Transformer assembly with intermediate frequency transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |