CN102044867A - Device for reducing lightning invasion wave gradient of transformer - Google Patents

Device for reducing lightning invasion wave gradient of transformer Download PDF

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Publication number
CN102044867A
CN102044867A CN2011100055180A CN201110005518A CN102044867A CN 102044867 A CN102044867 A CN 102044867A CN 2011100055180 A CN2011100055180 A CN 2011100055180A CN 201110005518 A CN201110005518 A CN 201110005518A CN 102044867 A CN102044867 A CN 102044867A
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CN
China
Prior art keywords
lightning
transformer
magnet ring
invaded
lightning arrester
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CN2011100055180A
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Chinese (zh)
Inventor
吴文宣
廖福旺
张榕林
黄海鲲
叶进强
游浩
郭清滔
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
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Priority to CN2011100055180A priority Critical patent/CN102044867A/en
Publication of CN102044867A publication Critical patent/CN102044867A/en
Pending legal-status Critical Current

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Abstract

The invention relates to transformer lightning protection equipment, in particular to a device for reducing lightning invasion wave gradient of a transformer. The structure of the device comprises a magnetic ring string formed by arranging a plurality of high-frequency magnetic rings in turn, wherein the magnetic ring string is arranged at the front end of a lightning arrester, namely between the transformer and the lightning arrester, or arranged at the rear end of the lightning arrester, namely between the lightning arrester and a bus. The device can remarkably reduce the invasion wave gradient so as to remarkably reduce the electric potential gradient among turns and greatly reduce the voltage leveling and breakdown risks among the turns, and then the turn-to-turn insulation discharge fault rate can be reduced exponentially and even by dozens of times; the device has obvious and effective technical effect on lightning wave amplitude and gradient of the invaded transformer, further completes the lightning protection measures of the transformer, has great significance for ensuring safe operation of the transformer, and creates a very favorable condition for long-term safe and stable operation of the transformer in a frequent lightning strike region.

Description

Reduce the transformer thunder and lightning and invade the device of wave steepness
Technical field
The present invention relates to a kind of transformer lightning protection equipment, particularly a kind of device that reduces transformer thunder and lightning intrusion wave steepness.
Background technology
It is a key factor that causes transformer insulated damage that transformer station's thunder and lightning is invaded ripple.When transformer station's outlet circuit takes place closely to be struck by lightning, it is short that lightning wave propagates into the distance of transformer station, it is little to decay, the thunder and lightning intrusion ripple that arrives transformer has very high steepness usually, on Transformer Winding, will produce serious uneven distribution, and usually make the turn-to-turn insulation of end winding suffer serious overvoltage, will bring bigger danger Transformer Winding, the southern area that special thunder and lightning takes place frequently, the incident that the damage of transformer thunder and lightning takes place is more frequent.Especially become for terminal, the inlet wire loop is few usually, and main electrical scheme is comparatively simple, and the lightning wave amplitude and the steepness of invading the main transformer winding are all higher, and its danger is also bigger.Therefore, it will be bigger invading the injury that transformer that ripple becomes terminal brings.The analysis showed that, Transformer Winding end fault mainly be thunder and lightning invade the too high local turn-to-turn electric potential gradient of bringing of wave steepness excessive due to, because there is parasitic capacitance over the ground in winding, invade ripple transient overvoltage major part and drop near the winding head end, make near the head end winding that the turn-to-turn insulation fault takes place especially easily and damage.Lightning arrester as protection usefulness can limit the amplitude that thunder and lightning is invaded ripple; but the influence to steepness is smaller; the high steepness overvoltage injury of invading for the near region lightning fault can not effectively protect, and therefore single lightning arrester is very inabundant and perfect as the lightning protection measure of restriction amplitude.
Summary of the invention
The objective of the invention is to provides the reduction transformer thunder and lightning of lightning protected measure that can be abundant, perfect to invade the device of wave steepness according to the deficiencies in the prior art part.
The present invention is achieved through the following channels:
Reduce the transformer thunder and lightning and invade the device of wave steepness, include lightning arrester, its structural feature is, also include the magnet ring string that a plurality of high frequency magnet rings rearrange in regular turn, it is installed in the lightning arrester front end, be between transformer and the lightning arrester, or be installed in the lightning arrester rear end, promptly between lightning arrester and the bus.
The high frequency magnet ring is enclosed within on the aerial condutor, an inductance element is equivalent to connect in the circuit, to increase the inductance of lead, effectively suppressed to invade the rate of climb of the lightning wave of transformer, and enforcing reflection, change propagation and the distribution of lightning wave in transformer station, reduce the amplitude and the steepness of transformer port lightning wave.Because the impedance of high frequency magnet ring is very little, loss is also little, to the almost not influence of the normal runnability of lead, therefore can set up new technical measures to existing equipment under the situation that does not influence normal operation.
The high frequency magnet ring mainly is used in the electron trade, the antagonism interference signal, interference signal is played shielding action, also have in the power industry high frequency magnet ring is used to suppress temporary overvoltage, but because the particularity of lightning wave, the amplitude of its generation and steepness are not that general circuit can be compared because of the temporary overvoltage that operation produces, its frequency is different fully, the lightning wave attribute has not confirmability, can't predict, therefore project team has carried out a large amount of simulation analysis and simulated experiment with regard to this technology especially, and observation and analysis of high frequency magnet ring are to the influence of lightning wave, the validity of the structural requirement of high frequency magnet ring and high frequency magnet ring installation site.Therefore the high frequency magnet ring being rearranged in regular turn the magnet ring string is installed between transformer and the lightning arrester or between lightning arrester and the bus; the intrusion wave steepness can be significantly reduced and just the turn-to-turn electric potential gradient can be significantly reduced; thereby reduce the risk of turn-to-turn voltage levvl and puncture significantly; turn-to-turn insulation discharge fault rate just can at double even tens of times reduce like this; have obviously reducing transformer lightning wave amplitude and steepness; the otherwise effective technique effect; replenish and the perfect lightning protection measure of transformer; have bigger practical significance for the safe operation that guarantees transformer, also transformer has been created very advantageous conditions in the long-term safety stable operation of multi-thunder area.
The high frequency magnet ring can have following selection:
The high frequency magnet ring adopts the amorphous magnetic core material of sandwich construction to constitute, and a plurality of magnet rings closely form the magnet ring string by touching.
Simple and easy magnet ring string can be made up of pure magnet ring units in series.Core material should be selected the material of high saturation magnetic flux density and high magnetic permeability.
Can also be compound magnet ring string:
Compound magnet ring string comprises magnet ring, insulating barrier and damping layer, magnet ring is made of toroidal core shape, insulating barrier is coated on the magnetic core appearance aspect, and damping layer is that conductive metallic material then is nested on the appearance aspect of insulating barrier, and a plurality of magnet rings that install damping layer additional form the magnet ring string by touching in regular turn.
This is a kind of magnet ring that installs damping layer additional, damping layer equivalence on circuit is a damping resistance, the high frequency magnet ring that has installed damping resistance additional is by damping resistance absorption inductor energy, suppress ascensional range, can improve the effect that suppresses lightning wave steepness and amplitude, because the effect of magnet ring equivalent inductance makes a part of lightning current by way of damping resistance, consumes the wave head energy and produces attenuation; In addition, damping resistance produces shunting action to the lightning current through the magnet ring string, to reduce the magnet ring saturation depth, helps the effect of performance magnet ring string under the big electric current.The equivalent inductance of magnet ring is big more, and the big more damping resistance of corresponding selection resistance obtains bigger attenuation.Also can be directly install suitable damping resistance additional, make it to satisfy shunting action lightning wave at the skin of magnet ring string.
Show by simulation analysis and experiment:
1, under the situation of not using damping resistance, the magnet ring string should be installed between lightning arrester and the bus, and obtainable optimal inhibition effect is: amplitude descends about 26%, and steepness descends about 46%;
2, when magnet ring installed damping resistance additional and constitutes the magnet ring string, this magnet ring string should be installed between transformer and the lightning arrester, can obtain optimal inhibition effect to be: amplitude descends about 30%, and steepness descends about 60%;
Magnet ring string related parameter choosing is as follows:
The length of magnet ring string is chosen as 3-10 rice, specifically decides on the effect of local lightening activity intensity and expectation acquisition.
Analysis and experiment show, under the effect of transformer lightning surge intrusion, the magnet ring string length is not to be linear with suppressing effect, when particularly between transformer and lightning arrester the magnet ring string being installed, suppress effect and saturated sign can occur, so magnet ring string length the best should be between 4-8 rice.
The overall diameter of magnet ring string is 30-50mm.Specifically look conductor size and the running current size adjusts accordingly.
According to the difference of running current, the overall diameter of magnet ring string also should be different to some extent, should consider bigger magnet ring diameter when running current is big, can reduce the adverse effect that running current brings because strengthen the magnet ring diameter.Draw according to a large amount of experimental analysis data: for the transformer of 220kV, best magnet ring is of a size of internal diameter 30mm, external diameter 40mm.
According to simulation calculation with research and analyse data in a large number and show, transformer for the area with more lightning activities operation, as long as between lightning arrester and transformer or lightning arrester and bus, install when having the magnet ring string of damping resistance, no matter whether there is running current, in suitable damping resistance scope was set, the inhibition effect of the thunder and lightning of invading transformer being invaded wave amplitude and steepness was all very remarkable, comparatively speaking, the technique effect of preceding a kind of application mode is more remarkable and economical, is the application model of the best.
In sum; the invention provides a kind of device that the transformer thunder and lightning is invaded wave steepness that reduces; it adopts the high frequency magnet ring to rearrange the magnet ring string in regular turn to be installed between transformer and the lightning arrester or between lightning arrester and the bus; can significantly reduce the intrusion wave steepness and just can reach remarkable reduction turn-to-turn electric potential gradient; thereby reduce the risk of turn-to-turn voltage levvl and puncture significantly; turn-to-turn insulation discharge fault rate just can at double even tens of times reduce like this; have obviously reducing the lightning wave amplitude and the steepness of invading transformer; the otherwise effective technique effect; the further perfect lightning protection measure of transformer; have bigger practical significance for the safe operation that guarantees transformer, also very advantageous conditions has been built in the long-term safety stable operation of the transformer of multi-thunder area.
Description of drawings
Fig. 1,2 is depicted as the application principle block diagram that reduction transformer thunder and lightning of the present invention is invaded the device of wave steepness;
Figure 3 shows that of the present invention not with the structural representation of the high frequency magnet ring string of damping resistance;
Figure 4 shows that the structural representation of the high frequency magnet ring string of band damping resistance of the present invention;
Below in conjunction with embodiment the present invention is described further.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 1 and accompanying drawing 2, reduce the transformer thunder and lightning and invade the device of wave steepness, include the magnet ring string that lightning arrester and a plurality of high frequency magnet ring rearrange in regular turn, accompanying drawing 1 is installed in the lightning arrester front end for this high frequency magnet ring string, be between transformer and the lightning arrester, accompanying drawing 2 is installed in the lightning arrester rear end for this high frequency magnet ring string, promptly between lightning arrester and the bus.
High frequency magnet ring string has two kinds of selections:
1, with reference to accompanying drawing 3, not with the magnet ring string of damping resistance, promptly pure magnet ring structure adopts the amorphous magnetic core material of multi-lay winding to constitute, and a plurality of magnet rings closely form the magnet ring string by touching.
2, with reference to accompanying drawing 4, the compound magnet ring string of band damping resistance, include magnetic core, insulating barrier and damping layer, magnetic core forms ring-shaped structure, insulating barrier is coated on the magnetic core appearance aspect, damping layer is then nested or be coated on the appearance aspect of insulating barrier, and a plurality of magnet rings that install damping layer additional form the magnet ring string by touching in regular turn.
Above-mentioned magnetic core need adopt the material of high saturation magnetic flux density and high magnetic permeability.
The present invention can derive four kinds of record schemes like this:
1, undamped magnet ring string is installed between transformer and lightning arrester:
In this kind application mode, thunder and lightning is invaded the superpotential steepness of wave edge of ripple and descended to some extent, but amplitude is higher than the situation when the magnet ring string is not installed, and is next more unfavorable in the situation of considering operating condition, so this technical scheme generally will not adopt.
2, undamped magnet ring string is installed between lightning arrester and bus:
In this kind application mode, thunder and lightning is invaded the superpotential steepness of ripple and amplitude all is suppressed, and effect is better than being installed between transformer and the lightning arrester.Optimal inhibition effect is: amplitude descends about 26%, and steepness descends about 46%; Under the situation of considering operating condition, with power frequency positive voltage counter current situation optimum, under the inverted running function of current, the amplitude and the steepness of lightning overvoltage further reduce.The operation power current has been offset a part of lightning current, makes magnet ring more difficult saturated, and is more favourable to reducing lightning overvoltage.With the operating mode least favorable of power frequency negative voltage positive current, this moment, the inhibition effect of magnet ring string was the poorest, and power-frequency voltage is opposite with intrusion wave voltage direction, has occurred vibration in the circuit.Simultaneously, when power current was identical with the lightning current direction, magnet ring was easier to be saturated, had reduced the effect that suppresses lightning overvoltage.
3, the compound magnet ring string that has damping resistance is installed between transformer and lightning arrester:
In this kind application mode, thunder and lightning is invaded the superpotential steepness of ripple and amplitude all is subjected to very big inhibition, and the damping resistance of this moment exists one to optimize span, could produce better overvoltage and suppress effect.The inhibition effect need be taken all factors into consideration the inhibition to steepness and amplitude.In simulation calculation, when damping resistance value during at 200~1000 Ω, effect is near optimum state, promptly the L/R time constant about 0.5~1.0 μ s, too big and too little, the overvoltage steepness is suppressed effect will significantly reduce.Therefore, when selecting the magnet ring material, select the material of higher saturation magnetic induction and magnetic permeability coefficient just more favourable.
Under the situation of considering operating condition, with power frequency positive voltage, counter current situation optimum, the amplitude and the steepness of invading ripple are all littler.Negative side's power current has reduced the degree of saturation of magnet ring.Under the situation that damping resistance is optimized, can provide 17% amplitude to suppress and 79% steepness suppresses effect.This technical scheme also is the best-of-breed technology scheme in all application models.
4, the compound magnet ring string that has damping resistance is installed between lightning arrester and bus:
In this kind application mode, thunder and lightning is invaded the superpotential steepness of ripple and amplitude also is subjected to very big inhibition, and is same, and damping resistance exists one to optimize span, and could producing preferably, overvoltage suppresses effect.When damping resistance is 400~1000 Ω left and right sides, also be the L/R time constant about 0.5~1.0 μ s, the inhibition effect of the amplitude of transformer lightning overvoltage and steepness is near best.Damping resistance has significantly been shunted the lightning current in the magnet ring string, thereby has reduced the degree of saturation of magnet ring string, improves and suppresses effect.
Under the situation of considering operating condition, be optimum with power frequency positive voltage, counter current, it is best that magnet ring string and damping resistance suppress effect, and its overvoltage amplitude is also minimum.Under the situation of parameter optimization, can provide 28% amplitude to suppress and 76% steepness suppresses effect.
According to simulation analysis, in technique scheme, the parameter of magnet ring string selects also to have optimization range:
Invade at thunder and lightning under the effect of ripple, the magnet ring string length is proportional with the inhibition effect, but is not to be linear, and the magnet ring string of same length is installed between transformer and the lightning arrester than the better effects if that is installed between bus and the lightning arrester.And after reaching certain-length, suppress effect and saturated sign can occur.Therefore the magnet ring string length should be chosen between the 3-10 rice, and most economical length is between 4-8 rice.
According to the difference of running current, the overall diameter of magnet ring string also should be different to some extent, are typically chosen between the 30-50mm.Bigger magnet ring diameter should be considered when running current is big, the adverse effect that running current brings can be reduced because strengthen the magnet ring diameter.According to a large amount of service data statistics as can be known, for the transformer of 220kV, best magnet ring is of a size of internal diameter 30mm, external diameter 40mm.
It is same as the prior art that the present invention does not state part.

Claims (10)

1. reduce the device that the transformer thunder and lightning is invaded wave steepness, include lightning arrester, it is characterized in that, also include the magnet ring string that a plurality of high frequency magnet rings rearrange in regular turn, it is installed in the lightning arrester front end, be between transformer and the lightning arrester, or be installed in the lightning arrester rear end, promptly between lightning arrester and the bus.
2. reduction transformer thunder and lightning according to claim 1 is invaded the device of wave steepness, it is characterized in that, the amorphous magnetic core material that the high frequency magnet ring adopts plural layer to twine constitutes, and a plurality of magnet rings closely form pure high frequency magnet ring string by touching.
3. reduction transformer thunder and lightning according to claim 1 is invaded the device of wave steepness, it is characterized in that, the high frequency magnet ring includes magnetic core, insulating barrier and damping layer, magnetic core forms ring-shaped structure, insulating barrier is coated on the magnetic core appearance aspect, damping layer is then nested or be coated on the appearance aspect of insulating barrier, and a plurality of magnet rings that install damping layer additional form the magnet ring string by touching in regular turn.
4. reduction transformer thunder and lightning according to claim 2 is invaded the device of wave steepness, it is characterized in that, pure high frequency magnet ring string is installed between lightning arrester and bus.
5. reduction transformer thunder and lightning according to claim 2 is invaded the device of wave steepness, it is characterized in that, pure high frequency magnet ring string is installed between transformer and lightning arrester.
6. reduction transformer thunder and lightning according to claim 3 is invaded the device of wave steepness, it is characterized in that the high frequency magnet ring string of mounting strap damping layer between lightning arrester and bus.
7. reduction transformer thunder and lightning according to claim 3 is invaded the device of wave steepness, it is characterized in that the high frequency magnet ring string of mounting strap damping layer between transformer and lightning arrester.
8. reduction transformer thunder and lightning according to claim 1 is invaded the device of wave steepness, it is characterized in that the length of magnet ring string is 3-10 rice.
9. reduction transformer thunder and lightning according to claim 1 is invaded the device of wave steepness, it is characterized in that the overall diameter of magnet ring string is 30-50mm.
10. reduction transformer thunder and lightning according to claim 6 is invaded the device of wave steepness, it is characterized in that damping resistance is 500 Ω ± 300 Ω.
CN2011100055180A 2011-01-12 2011-01-12 Device for reducing lightning invasion wave gradient of transformer Pending CN102044867A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972396A (en) * 2017-03-20 2017-07-21 平高集团有限公司 VFTO restraining devices, damping bus unit, bus and GIS
CN109888757A (en) * 2019-01-23 2019-06-14 平高集团有限公司 VFTO inhibits device and GIS device
CN110060179A (en) * 2019-04-24 2019-07-26 国网山东省电力公司济南供电公司 Multi-voltage grade Maintenance Schedule Optimization method and device based on risk degree of overlapping
CN114336562A (en) * 2021-12-03 2022-04-12 广东电网有限责任公司 Transformer lightning overvoltage protection device
CN114678850A (en) * 2022-03-15 2022-06-28 昆明理工大学 Magnetic ring device for suppressing lightning waves

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2658998Y (en) * 2003-09-27 2004-11-24 孙文传 Combined over voltage protector
CN201975776U (en) * 2011-01-12 2011-09-14 福建省电力有限公司电力科学研究院 Device capable of reducing steepness of lightning intruding wave onto transformer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2658998Y (en) * 2003-09-27 2004-11-24 孙文传 Combined over voltage protector
CN201975776U (en) * 2011-01-12 2011-09-14 福建省电力有限公司电力科学研究院 Device capable of reducing steepness of lightning intruding wave onto transformer

Non-Patent Citations (1)

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Title
关永刚等: "应用高频磁环并联阻尼电阻抑制变压器雷电过电压的方法", 《电网技术》, vol. 34, no. 9, 30 September 2010 (2010-09-30), pages 149 - 154 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972396A (en) * 2017-03-20 2017-07-21 平高集团有限公司 VFTO restraining devices, damping bus unit, bus and GIS
CN109888757A (en) * 2019-01-23 2019-06-14 平高集团有限公司 VFTO inhibits device and GIS device
CN110060179A (en) * 2019-04-24 2019-07-26 国网山东省电力公司济南供电公司 Multi-voltage grade Maintenance Schedule Optimization method and device based on risk degree of overlapping
CN110060179B (en) * 2019-04-24 2023-04-18 国网山东省电力公司济南供电公司 Multi-voltage-level maintenance plan optimization method and device based on risk overlapping degree
CN114336562A (en) * 2021-12-03 2022-04-12 广东电网有限责任公司 Transformer lightning overvoltage protection device
CN114678850A (en) * 2022-03-15 2022-06-28 昆明理工大学 Magnetic ring device for suppressing lightning waves

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