CN114678850A - Magnetic ring device for suppressing lightning waves - Google Patents
Magnetic ring device for suppressing lightning waves Download PDFInfo
- Publication number
- CN114678850A CN114678850A CN202210252874.0A CN202210252874A CN114678850A CN 114678850 A CN114678850 A CN 114678850A CN 202210252874 A CN202210252874 A CN 202210252874A CN 114678850 A CN114678850 A CN 114678850A
- Authority
- CN
- China
- Prior art keywords
- magnetic ring
- semi
- lightning
- enameled wire
- waves
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
Abstract
The invention discloses a magnetic ring device for suppressing lightning waves, which is characterized by comprising: a housing, a magnetic ring assembly; the magnetic ring assembly is fixedly arranged in the shell, and the shell is used as a carrier to be coated on the periphery of the cable; the magnetic ring assembly comprises a semi-arc magnet and an enameled wire surrounding the periphery of the semi-arc magnet, and two ends of the enameled wire are fixedly connected with damping resistors; the invention provides a magnetic ring device for inhibiting lightning waves, which is characterized in that an anti-group element is constructed by a magnetic ring, a coil and a damping resistor, the lightning waves are absorbed by the electromagnetic interference of the magnetic ring and are radiated in a heat energy mode, the impact damage of the lightning waves in a high-voltage distribution network line can be solved, primary and secondary equipment directly or indirectly connected with the distribution network line is protected, and the stability of a power system is improved.
Description
Technical Field
The invention belongs to the technical field of power protection devices, and particularly relates to a magnetic ring device for inhibiting lightning waves.
Background
With the rapid development of power systems, the generated electricity needs to be transmitted over a longer distance, and a transmission path is provided with a plurality of power devices, such as transformers, circuit breakers and the like, and secondary devices for monitoring the real-time state of a power transmission network, such as FTUs, fault indicators and the like. Due to the large size of the power transmission network, the risk of the power transmission network is greatly increased, and due to the numerous uncertain factors outdoors, the risk is increased by geometric factors, wherein the risk of lightning in the power system is serious and common.
Because the lightning wave has the characteristic of steeper wave front voltage, the voltage transmitted to the main transformer is approximately distributed on the winding in an exponential manner, so that the insulation at the head end bears higher voltage difference to break down the insulation; harmonic components of the lightning waves may also cause resonance in the transformer windings, breaking down the transformer insulation; porcelain bottles of the power transmission network are also seriously damaged, and because lightning waves have extremely high amplitude and are sharply increased in a short time, the porcelain bottles are particularly easy to be punctured, and a power line is damaged; the harm of the lightning waves to the secondary equipment for online monitoring is terrorist, once the lightning waves are driven in, the amplitude of the lightning waves is incomparable to the voltage used by the secondary equipment, and all components are difficult to be avoided.
At present, the common modes of installing arc striking gaps and lightning arresters at home and abroad reduce the risk of lightning waves. The principle of the arc striking gap is to find a point capable of releasing lightning current, install the arc striking gap and directly introduce the point on the line to the underground to play a role in protecting the line, but the application range is narrow, the line cannot be protected on a multi-transmission line, and the arc striking gap is only suitable for remote places. The principle of installation arrester is parallelly connected the arrester on the protection point, the arrester is equivalent to and ground circuit break when not having the thunder and lightning, when meeting the thunder and lightning, the arrester is equivalent to and ground circuit break, directly flow into ground with voltage reduction electric current, such method is introduced the thunder and lightning wave to the ground effectively, the lightning-arrest effect has been played to protective apparatus, but the arrester is disposable, just need change after the thunder and lightning punctures also difficult discovery, this has just increased the uncertainty for protective apparatus, increase the risk simultaneously.
The Japan adopts a mode of adding a negative protection angle and an insulator string with a arcing horn to prevent lightning. The application of Japan is wide, the former reduces the shielding ability to avoid shielding failure, and the latter reduces the lightning stroke accident rate by reducing the damage effect of short circuit current after lightning stroke flashover. In other words, the lightning protection capability of the line is enhanced by connecting annular outer gap metal oxide arresters in series. The method has good effect on protecting the whole line, but has high price and complex construction.
Therefore, the research on the more economic and effective inhibition of the lightning wave energy has important significance on the power system because the lightning wave energy does not harm the power grid line.
Disclosure of Invention
In order to solve the technical problems, the invention designs a magnetic ring device for suppressing lightning waves, and designs a high-frequency magnetic ring to be sleeved on equipment to be protected so as to solve the problems of high price, complex operation and poor stability of the traditional lightning wave suppression.
In order to achieve the technical effect of solving the technical problems, the invention is realized by the following technical scheme: a magnetic ring device for suppressing a lightning wave, comprising: a housing, a magnetic ring assembly;
The magnetic ring assembly is fixedly arranged in the shell, and the shell is used as a carrier to be coated on the periphery of the cable;
the magnetic ring assembly comprises a semi-arc magnet and an enameled wire surrounding the periphery of the semi-arc magnet, and two ends of the enameled wire are fixedly connected with damping resistors;
furthermore, the shell is in a semi-cylindrical shape, every two of the shell are fixedly spliced by bolts to form an integral shell of the device, a plurality of semi-arc magnets are arranged in the shell in a regular arrangement mode, and the shell is filled with organic silicon elastic glue;
furthermore, the enameled wire is wound by more than two turns of the semi-arc magnet;
further, the damping resistors are welded at two ends of the enameled wire;
the invention has the beneficial effects that:
the invention provides a magnetic ring device for inhibiting lightning waves, which is characterized in that an anti-group element is constructed by a magnetic ring, a coil and a damping resistor, electromagnetic interference of the magnetic rings with different characteristics absorbs energy sections of the lightning waves and radiates the energy sections in a heat energy mode, so that the impact damage of the lightning waves in a high-voltage distribution network line can be solved, primary and secondary equipment directly or indirectly connected with the distribution network line is protected, and the stability of a power system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an overall structural view of a magnetic ring device for suppressing a lightning wave;
FIG. 2 is a schematic view of a magnetic ring assembly and its attached structure of a magnetic ring device for suppressing lightning waves;
in the drawings, the reference numbers indicate the following list of parts:
1-damping resistor, 2-enameled wire, 3-semi-circular magnet, 4-shell, 5-magnetic ring component and 6-cable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 2, a magnetic ring device for suppressing lightning waves includes: a shell 4 and a magnetic ring assembly 5;
the magnetic ring assembly 5 is fixedly arranged in the shell 4 and is coated on the periphery of the cable 6 by taking the shell 4 as a carrier;
the magnetic ring assembly 5 comprises a semi-arc magnet 3 and an enameled wire 2 surrounding the periphery of the semi-arc magnet 3, and two ends of the enameled wire 2 are fixedly connected with damping resistors 1;
The shell 4 is in a semi-cylindrical shape, every two of the shell are fixedly spliced by bolts to form an integral shell of the device, the semi-arc magnets 3 are provided with a plurality of blocks and are regularly arranged in the shell 4, and the shell 4 is filled with organic silicon elastic glue;
the enameled wire 2 winds the semi-arc magnet 3 for more than two turns;
the damping resistor 1 is welded at two ends of the enameled wire 2;
the lightning wave suppression device provided by the invention can solve the lightning wave impact damage degree in a high-voltage distribution network line, protect primary and secondary equipment directly or indirectly connected with the distribution network line and improve the stability of a power system.
The principle is that the lightning suppression device is sleeved on a cable in front of a protective device or in a transmission path, namely, an impedance element is connected in series on the cable, the impedance at low frequency band (power frequency) mainly comprises inductive reactance of an inductor, and the magnetic ring formed by two semi-circular magnetic rings 3 has extremely low integral loss energy. Because the semi-arc magnetic ring 3 has high magnetic conductivity and large inductance, electromagnetic interference is reflected and restrained, the whole device is an inductor with low loss and high Q value, resonance is easy to occur, and the anti-interference capability is weakened; in a high frequency band (lightning wave), the magnetic conductivity of the semi-arc magnetic ring 3 becomes lower, the inductance of the whole semi-arc magnetic ring 3 is reduced, and the inductive reactance is reduced; meanwhile, as the frequency rises, the integral loss formed by the two semi-arc magnetic rings 3 is mainly that the eddy current loss increases, and the resistance component of the semi-arc magnetic ring 3 increases along with the increase of the frequency.
The impedance formed by the two semi-circular arc magnetic rings 3 under high frequency mainly comprises resistance components, the total impedance is increased rapidly along with the increase of frequency, and electromagnetic interference waves passing through the semi-circular arc magnetic rings 3 are absorbed by the impedance and are emitted in a heat energy mode; the enameled wire 2 of the magnetic ring externally connected with the damping resistor 1 induces current and consumes when the magnetic induction line in the semi-arc magnetic ring 3 is suddenly increased, and the integrally absorbable thunder and lightning wave energy is enlarged.
Example 2
This embodiment is a further preferable embodiment of the lightning wave suppression device according to embodiment 1 above;
semi-arc magnetic ring 3: the material is preferably ferrite and a ferrite material magnetic ring is a magnetic ring which is mainly matched with a nanocrystalline material, and the purpose is to enlarge the bandwidth of the semi-arc magnetic ring 3 and ensure that the magnetic ring can play an excellent role in inhibiting lightning waves in different frequency bands; the ferrite has higher initial permeability, is suitable for absorbing larger impact energy of lightning waves, has the working frequency of 100kHz-1MHz, and has stronger effect on national standard lightning of about 300 KHz; the working frequency of the nanocrystalline magnetic ring is 10kHz-200kHz, and the nanocrystalline magnetic ring has strong magnetic saturation characteristics, about 1.2T, and can effectively inhibit the low-frequency energy of lightning waves; the inner diameter of the semi-arc magnetic ring 3 is selected according to the outer diameter of the high-voltage cable, a certain winding space is reserved, the common inner diameter is 27mm-40mm, the outer diameter is 55mm-70mm, and the height is 25 mm; the opening of the semi-arc magnetic ring 3 is sleeved on the cable oppositely, and the two openings are tightly attached.
Enameled wire 2: the material is preferably internally formed by twisting a plurality of thin copper wires, so that induced current under the high-frequency condition can pass through the material, partial energy in the semi-arc magnetic ring 3 is absorbed greatly and converted into electric energy, and the magnetic saturation characteristic of the semi-arc magnetic ring 3 is improved indirectly; the enameled wire 2 is wound on the semi-circular magnetic ring 3, the number of turns is preferably three, the wire diameter is about 1.5mm, and the two left ports are arranged on the outer surface of the outer diameter of the semi-circular magnetic ring 3.
Damping resistance 1: the damping resistor is used for consuming partial energy generated by an enameled wire, the damping resistor is preferably small in size, the damping resistor 1 with small parasitic inductance is used, the too large resistance value of the damping resistor hinders the consumed energy, the too small resistance value can affect the absorption of the energy of the semi-arc magnetic ring 3, the optimal resistance value is matched with the equivalent resistance of the semi-arc magnetic ring 3, the calculation formula is R0 kR k rho L/S, R is the equivalent resistance of the semi-arc magnetic ring 3, rho is the resistivity of the semi-arc magnetic ring 3, L is the effective length of the semi-arc magnetic ring 3, S is the effective sectional area of the semi-arc magnetic ring 3, k is a coefficient, and the optimal value range of the k is 5-30.
The shell 4: the high-strength BMC material has good waterproof performance, high-temperature resistance, flame retardant performance and insulating performance, can perform well under the condition of facing outdoor severe environment, and prolongs the service life; the hollow semi-circular truncated cone is combined by a hollow semi-cylinder with the middle part being 55mm in inner diameter and about 700mm in length, a hollow semi-circular truncated cone with the two ends being 23mm in small inner diameter and 55 in large inner diameter and 60mm in mm length, and the thickness of the hollow semi-circular truncated cone is 3 mm; the outer diameter of the semi-circular magnetic ring 3 and the wound enameled wire 2 are attached to the inner surface of the hollow semi-cylinder, a plurality of the semi-circular magnetic rings are uniformly and tightly arranged, and are encapsulated by high-heat-conductivity and high-temperature-resistant organic silicon elastic glue, and the other half of the semi-circular magnetic rings is also encapsulated so that two half of electric power insulation fixing sleeves can be tightly clamped on a high-voltage cable 6, wherein the semi-circular magnetic rings 3 also need to be tightly attached, and high-strength glue is encapsulated in hollow round tables at two ends so that the semi-circular magnetic rings can be tightly occluded and cannot shake when clamped on the cable; fixing bolts with round holes with the radius of 5mm in the middle are arranged on two sides of the fixing sleeve, and the two halves can be fixed by using insulating bolts.
In summary, the invention provides a magnetic ring device for suppressing a lightning wave, wherein an anti-group element is constructed by a magnetic ring, a coil and a damping resistor, the lightning wave is absorbed by electromagnetic interference of the magnetic ring and is radiated in a heat energy form, so that the impact damage of the lightning wave in a high-voltage distribution network line can be solved, a secondary device directly or indirectly connected with the distribution network line is protected, and the stability of a power system is improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A magnetic ring device for suppressing a lightning wave, comprising: a housing, a magnetic ring assembly;
the magnetic ring assembly is fixedly arranged in the shell, and the shell is used as a carrier to be coated on the periphery of the cable;
the magnetic ring assembly comprises a semi-arc magnet and an enameled wire surrounding the periphery of the semi-arc magnet, and damping resistors are fixedly connected to two ends of the enameled wire.
2. The magnetic ring device for suppressing lightning waves as recited in claim 1, wherein said housing is a semi-cylindrical shape, two by two, said housing being assembled together by bolts to form an integral casing of said device, said semi-circular magnets being disposed in a plurality of pieces, said pieces being regularly arranged in said housing, said housing being filled with silicone elastomer.
3. A magnetic ring apparatus for suppressing lightning waves as defined in claim 1, wherein said enameled wire is wound around the semi-arc magnet for two or more turns.
4. A magnetic ring device for suppressing lightning waves as defined in claim 1, wherein said damping resistors are welded to both ends of the enameled wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210252874.0A CN114678850A (en) | 2022-03-15 | 2022-03-15 | Magnetic ring device for suppressing lightning waves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210252874.0A CN114678850A (en) | 2022-03-15 | 2022-03-15 | Magnetic ring device for suppressing lightning waves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114678850A true CN114678850A (en) | 2022-06-28 |
Family
ID=82074759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210252874.0A Pending CN114678850A (en) | 2022-03-15 | 2022-03-15 | Magnetic ring device for suppressing lightning waves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114678850A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621981A (en) * | 2022-12-20 | 2023-01-17 | 西华大学 | Overvoltage protection method and system for circuit of wind power plant |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05153728A (en) * | 1991-11-26 | 1993-06-18 | Chubu Electric Power Co Inc | Large current high voltage surge reducer |
| JP2002095158A (en) * | 2000-09-08 | 2002-03-29 | Tokin Corp | Lightning surge suppressor |
| CN102044867A (en) * | 2011-01-12 | 2011-05-04 | 福建省电力有限公司电力科学研究院 | Device for reducing lightning invasion wave gradient of transformer |
| CN203086127U (en) * | 2012-12-07 | 2013-07-24 | 国家电网公司 | Magnetic choked flow device |
| CN103474975A (en) * | 2013-09-28 | 2013-12-25 | 成都星河科技产业有限公司 | Lightning-protection nanometer magnet choke device |
| CN107968390A (en) * | 2017-11-01 | 2018-04-27 | 李宝华 | A kind of Lightning Electromagnetic Pulse energy absorption filtering system |
-
2022
- 2022-03-15 CN CN202210252874.0A patent/CN114678850A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05153728A (en) * | 1991-11-26 | 1993-06-18 | Chubu Electric Power Co Inc | Large current high voltage surge reducer |
| JP2002095158A (en) * | 2000-09-08 | 2002-03-29 | Tokin Corp | Lightning surge suppressor |
| CN102044867A (en) * | 2011-01-12 | 2011-05-04 | 福建省电力有限公司电力科学研究院 | Device for reducing lightning invasion wave gradient of transformer |
| CN203086127U (en) * | 2012-12-07 | 2013-07-24 | 国家电网公司 | Magnetic choked flow device |
| CN103474975A (en) * | 2013-09-28 | 2013-12-25 | 成都星河科技产业有限公司 | Lightning-protection nanometer magnet choke device |
| CN107968390A (en) * | 2017-11-01 | 2018-04-27 | 李宝华 | A kind of Lightning Electromagnetic Pulse energy absorption filtering system |
Non-Patent Citations (1)
| Title |
|---|
| 浙江省电力中心试验所高压试验组等: "《串联电容补偿装置在电力系统中的应用》", 水利电力出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621981A (en) * | 2022-12-20 | 2023-01-17 | 西华大学 | Overvoltage protection method and system for circuit of wind power plant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8929048B2 (en) | Very fast transient suppressing device | |
| CN114678850A (en) | Magnetic ring device for suppressing lightning waves | |
| US7606017B2 (en) | Protection device: surge suppressing conductor | |
| CN115696889A (en) | Electromagnetic wave shielding filter | |
| CN102044867A (en) | Device for reducing lightning invasion wave gradient of transformer | |
| CN201975776U (en) | Device capable of reducing steepness of lightning intruding wave onto transformer | |
| CN204257253U (en) | Novel building lightning protection cable | |
| CN103474975B (en) | A kind of thunder-lightning nano magnetic choke apparatus | |
| JP2010246350A (en) | Lightning-protection coaxial cable | |
| CN103956215A (en) | Shielding cable | |
| CN209881404U (en) | Lightning overvoltage shielding device of 10kV distribution transformer | |
| CN212210490U (en) | Lightning protection circuit and lightning protection device | |
| KR102420249B1 (en) | Filter for Shielding Electro-Magnetic Wave | |
| CN106531415A (en) | Electric reactance device with over voltage suppression and preparation method thereof | |
| CN107578901A (en) | A kind of transformer electromagnetic interference protecting system | |
| CN212516730U (en) | Join in marriage net high climbing torpedo insulator | |
| RU194412U1 (en) | Noise suppression cable | |
| CN106099897B (en) | Arc-extinguishing resonance-extinguishing device | |
| CN211150221U (en) | Lightning arrester for distribution network | |
| CN203491691U (en) | Lightning protection nanometer magnetic choke | |
| CN213070882U (en) | Lightning protection transformer | |
| CN203193267U (en) | Video lightning protection device and video monitoring system | |
| CN214123572U (en) | Copper conductor structure for lightning protection cable of mobile base station | |
| CN210325463U (en) | Transformer for station | |
| CN105071364A (en) | Method for restricting parasitic current of cable shielding layer of secondary system of transformer station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |