CN111584175B - Low-voltage surge protector - Google Patents
Low-voltage surge protector Download PDFInfo
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- CN111584175B CN111584175B CN202010453352.8A CN202010453352A CN111584175B CN 111584175 B CN111584175 B CN 111584175B CN 202010453352 A CN202010453352 A CN 202010453352A CN 111584175 B CN111584175 B CN 111584175B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C13/00—Resistors not provided for elsewhere
- H01C13/02—Structural combinations of resistors
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Abstract
The invention discloses a low-voltage surge protector, which belongs to the field of surge protectors and comprises a zinc oxide valve plate and a silicon carbide valve plate which are combined into a protector in parallel, wherein the average electric field intensity per millimeter of the zinc oxide valve plate is 20-25V/mm, the maximum through-flow is 100A, the average electric field intensity per millimeter of the silicon carbide valve plate is 36-45V/mm, when the voltage is lower than 100V, the leakage current of the silicon carbide valve plate is 0.2-0.4mA, and the action voltage of the silicon carbide valve plate is smaller than the action voltage of the zinc oxide valve plate. The invention integrates surge, demagnetization and overvoltage, fully utilizes the characteristics of low leakage of the high-energy silicon carbide hair piece and rapid and stable clamping of the high-energy zinc oxide hair piece, constructs a release channel in advance, prevents the generation of surge overvoltage, and directly clamps and absorbs the surge with overlarge energy, thereby effectively making up the defects of the traditional surge protector in a 0-100V low-voltage power system.
Description
Technical Field
The invention relates to the technical field of surge protectors, in particular to a low-voltage surge protector.
Background
The rapid development of modern industry brings convenience, high efficiency and huge economic benefits to people, meanwhile, a plurality of large-capacity power electronic devices are adopted in a power grid, such as variable frequency air conditioners which are used in large quantities in cities and countryside, thyristor converter devices which are adopted in large-scale factories and the like, due to the nonlinear, impact and unbalanced frequently-switched power utilization characteristics, the power grid pollution is caused to a public power grid, a large amount of harmonic waves are injected, surge overvoltage is generated, interference is brought to the normal work of a plurality of electronic devices, instruments and meters and communication lines, and some serious devices can also damage precise components.
In order to eliminate overvoltage surge, a surge protector is commonly arranged in the industry at present. The traditional surge protector adopts a zinc oxide valve plate, the valve plate material shows non-ohmic conductance, the leakage current of the valve plate material under normal working voltage is far less than 1mA, and the zinc oxide ceramic material has overhigh threshold voltage (the lowest threshold voltage U)1mA160V), the single chip can be too small (the maximum through-flow is 60A), and the like, so that the surge protection effect is not obvious in the practical application of the low-voltage field of 0-100V; the action voltage is inevitably reduced to obtain an obvious protection effect, and the frequent action of the valve plate inevitably causes serious heating and endangers the safety of the valve plate under the same condition due to the capacity of a single valve plate.
Disclosure of Invention
The invention aims to provide a low-voltage surge protector which has the advantage of improving the surge protection effect in the low-voltage field of 0-100V.
The technical purpose of the invention is realized by the following technical scheme:
a low-voltage surge protector comprises a first nonlinear resistance valve plate and a second nonlinear resistance valve plate which are combined into a protector in parallel, wherein the first nonlinear resistance valve plate is a zinc oxide valve plate, the average thickness per millimeter electric field intensity of the first nonlinear resistance valve plate is 20-25V/mm, the maximum through current is 100A, the second nonlinear resistance valve plate is a silicon carbide valve plate, the average thickness per millimeter electric field intensity of the second nonlinear resistance valve plate is 36-45V/mm, when the voltage is lower than 100V, the leakage current of the second nonlinear resistance valve plate is 0.2-0.4mA, and the action voltage of the second nonlinear resistance valve plate is smaller than that of the first nonlinear resistance valve plate.
By adopting the technical scheme, the silicon carbide valve plate in the application has the characteristic of conventional high capacity, the leakage current is 0.2-0.4mA under the voltage of 100V and is almost zero, the silicon carbide valve plate is in an insulation state, the action voltage of the second nonlinear resistance valve plate is smaller than that of the first nonlinear resistance valve plate, the silicon carbide valve plate starts to work in the protector, and the zinc oxide valve plate works when the voltage is higher than a certain value. The surge protection is carried out by combining the advantages and characteristics of the valve plates made of two different materials, so that the problem that the valve plate made of single zinc oxide is limited in the low-voltage field of 0-100V in the prior art is solved, and a better surge protection effect is achieved.
The present invention in a preferred example may be further configured to: the first nonlinear resistance valve plate comprises the following ingredients in parts by weight: 98-99 parts of zinc oxide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder.
The present invention in a preferred example may be further configured to: the second nonlinear resistance valve plate comprises the following ingredients in parts by weight: 98-99 parts of silicon carbide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder.
The present invention in a preferred example may be further configured to: the environment-friendly and environment-friendly composite material also comprises plant ash, wherein the plant ash is compounded with the zinc oxide powder and the silicon carbide powder according to the weight ratio of 1: 13.
By adopting the technical scheme, the plant ash is the residue after the plant burns, can be used as fuel after being recovered, contains carbon and metal oxide as main components and also contains some trace elements, and is compounded with silicon carbide powder or zinc oxide powder to form the ceramic valve plate after being sintered at high temperature, so that the energy density of the valve plate can be further improved; in addition, the plant ash also belongs to waste recycling, and has excellent energy-saving and environment-friendly effects.
The present invention in a preferred example may be further configured to: the adhesive is prepared by mixing the following components in parts by weight: 25-35 parts of anionic clay, 10-15 parts of acetylene black, 5-10 parts of corn starch and 40-50 parts of water.
By adopting the technical scheme, the specific surface area of the anionic clay is large, and acetylene black and corn starch can be attached to the anionic clay, so that the prepared adhesive has excellent adhesion and good thermal conductivity, and after the adhesive is added into zinc oxide or silicon carbide powder, the compactness of the valve plate after sintering can be improved, and the heat dissipation performance of the valve plate can be promoted.
The present invention in a preferred example may be further configured to: the preparation process of the first nonlinear resistance valve plate comprises the following steps: (1) preparing materials: weighing zinc oxide powder, conductive carbon black and a binder in corresponding parts by weight according to a formula of the first nonlinear resistance valve plate;
(2) mixing materials;
(3) drying and forming: drying the slurry mixed in the step (2), and forming by adopting a stamping type press to form a first nonlinear resistance valve plate blank;
(4) pre-burning: placing the first nonlinear resistance valve plate blank in the step (3) in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 hours;
(5) spraying: introducing hydrogen into the sintering furnace after the pre-sintering in the step (4), heating to 1400-1600 ℃, and then preserving heat for 70-75 hours to form a first nonlinear resistor valve plate semi-finished product; and then cooling the first nonlinear resistance valve plate semi-finished product to 650-750 ℃ along with a furnace, taking out, spraying aluminum electrodes on two end surfaces of the first nonlinear resistance valve plate semi-finished product, continuously cooling naturally, and spraying insulating paint on the side surface of the first nonlinear resistance valve plate semi-finished product.
By adopting the technical scheme, zinc oxide powder, conductive carbon black, a binder and plant ash are blended, the ingredients are designed for independent research and development, the components are uniformly mixed and dried and sintered, the sintered semi-finished product of the first nonlinear resistance valve plate is cooled along with a furnace, when the temperature is reduced to 650-750 ℃, aluminum electrodes are sprayed to two ends of the valve plate, the surface temperature difference between the aluminum electrodes and the valve plate is small, an aluminum welding wire is quickly melted under the blow-welding action of a spot welding machine and is uniformly coated on the end surface of the valve plate, so that the aluminum electrodes and the valve plate are better combined together, the sealing performance of two ends of the valve plate taking zinc oxide as a main material is remarkably improved, moisture is prevented from invading from an air gap, the generation amount of leakage current is reduced, and the valve plate simultaneously having higher energy density and lower average thickness per millimeter electric field intensity is prepared.
The present invention in a preferred example may be further configured to: the preparation process of the second nonlinear resistance valve plate comprises the following steps: (1) preparing materials: according to the formula of the second nonlinear resistance valve plate, weighing the silicon carbide powder, the conductive carbon black and the binder in corresponding parts by weight;
(2) mixing materials;
(3) drying and forming: drying the slurry mixed in the step (2), and forming by adopting a stamping type press to form a second nonlinear resistance valve plate blank;
(4) pre-burning: placing the second nonlinear resistance valve plate blank in the step (3) in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 hours;
(5) spraying: introducing hydrogen into the sintering furnace after the pre-sintering in the step (4), heating to 1400-1600 ℃, and then preserving heat for 70-75 hours to form a second nonlinear resistance valve plate semi-finished product; and then cooling the second nonlinear resistance valve plate semi-finished product to 650-750 ℃ along with the furnace, taking out, spraying aluminum electrodes on two end surfaces of the second nonlinear resistance valve plate semi-finished product, continuously cooling naturally, and spraying insulating paint on the side surface of the second nonlinear resistance valve plate semi-finished product.
By adopting the technical scheme, the silicon carbide is a compound material consisting of silicon and carbon, is very stable in the aspects of heat, chemistry and machinery, the SiC has higher carrier mobility and higher energy density, and the SiC power device has the characteristics of high withstand voltage, low loss, high efficiency and the like, and belongs to an ideal power device; silicon carbide powder, conductive carbon black, a binder and plant ash are blended, the ingredients are designed for independent research and development, the components are uniformly mixed, drying and sintering are carried out, the sintered second nonlinear resistance valve plate semi-finished product is cooled along with a furnace, when the temperature is reduced to 650-750 ℃, aluminum electrodes are sprayed to two ends of the valve plate, the surface temperature difference between the aluminum electrodes and the ceramic valve plate is small, an aluminum welding wire is quickly melted under the blow welding action of a spot welding machine and is uniformly coated on the end face of the valve plate, so that the aluminum electrodes and the valve plate are better combined together, the sealing performance of two ends of the ceramic valve plate taking silicon carbide as a main material is remarkably improved, moisture is prevented from invading from an air gap, the generation amount of leakage current is reduced, and the valve plate with high energy density and small leakage current is prepared.
In conclusion, the beneficial technical effects of the invention are as follows:
when the circuit works normally, the protector does not work, the leakage current of the protector is 0, and the normal work of the protected circuit is not influenced at all; when surge occurs in the circuit, the voltage is only slightly higher than normal working voltage at the moment, the protector starts to work, the second nonlinear valve plate made of silicon carbide materials provides a discharge channel for surge overvoltage at the moment, leakage current flows through the discharge channel, electromagnetic energy is converted into heat energy through the valve plate in time, the purposes of energy consumption and demagnetization are achieved, the protector can work for a long time due to the fact that the energy density of the second nonlinear resistor valve plate is large, when overlarge surge impact and overvoltage impact occur, the protector starts to convert the second nonlinear resistor valve plate into the first nonlinear resistor valve plate made of zinc oxide materials to work, the overvoltage can be clamped rapidly, and the effect of surge absorption is achieved. Because the energy release channel is formed in the actual operation switching process, surge overvoltage can not be generated.
Drawings
Fig. 1 is a schematic diagram for embodying an operating circuit of the protector in the fifth embodiment.
Fig. 2 is a schematic diagram of a current-voltage characteristic principle for embodying the operation of the low-voltage surge protector in the fifth embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Acetylene black was purchased from acetylene black produced by Tianjin Yibo Rui chemical Co., Ltd, CAS: 1333-86-4; corn starch was purchased from suzhou blue-jet chemical technology ltd, CAS: 9005-25-8; the plant ash is purchased from Xinghua Sannong plant ash Co., Ltd; the anionic clay was prepared according to the method described in "preparation and characterization of anionic clay and study of its adsorption property to DNA" published by Li bin, university of south China's Rich chemical industry ".
The first embodiment is as follows:
the preparation process of the first nonlinear resistance valve plate comprises the following steps:
(1) preparing materials: preparing a binder in advance, and mixing the following components in parts by weight: weighing 25 parts of anionic clay, 10 parts of acetylene black, 5 parts of corn starch and 40 parts of water; then, 98 parts by weight of zinc oxide powder, 1 part by weight of conductive carbon black, and 0.3 part by weight of the prepared binder were weighed.
(2) Mixing materials: preferentially putting the zinc oxide powder weighed in the step (1) into an upright ball mill, introducing air flow, and uniformly adding the anionic clay, the conductive carbon black and the binder weighed in the step (1) into the upright ball mill at the rotating speed of 180r/min for ball milling for 10 hours.
(3) Drying and forming: drying the mixed slurry at 120 deg.C, spray drying to obtain powder, and molding to obtain a first non-linear resistance valve plate blank with a stamping press under a molding pressure of 8Mpa/cm2The pressure was maintained for 2.5 minutes. When the pressure is too low, the drying strength of the blank is too low, and when the pressure is too high, stress is easily formed in the blank due to uneven pressure transmission, thereby causing subsequent sintering defects.
Because the zinc oxide powder in the step (2) is added firstly, the zinc oxide powder is broken up by the action of airflow to form a dispersion carrier, so that the multiple powders are collided together at a high speed in an irregular state, and the powders are subjected to high-speed friction, so that the electrostatic adsorption among all the components can be improved, and the binding property during blank forming can be improved.
(4) Grinding: and (4) grinding the surface of the first nonlinear resistance valve plate blank in the step (3) by using a planetary grinding machine.
(5) Pre-burning: and (5) placing the first nonlinear resistance valve plate blank ground in the step (4) in a sintering furnace, controlling the temperature to be 500 ℃, and keeping for 2.5 hours.
(6) And (3) sintering: and (4) introducing hydrogen after pre-sintering, heating to 1500 ℃, and then preserving heat for 70 h.
(7) Aluminum spraying: and (4) cooling the pre-sintered first nonlinear resistance valve plate blank in the step (6) to 650 ℃ along with a furnace, taking out, spraying aluminum electrodes on two end surfaces of the first nonlinear resistance valve plate blank, continuously cooling naturally, and spraying insulating paint on the side surfaces of the first nonlinear resistance valve plate blank.
And (3) performing performance detection on the first nonlinear resistance valve plates in the same batch prepared in the first embodiment, wherein the number of detection samples is three, namely samples one to three:
example two: the preparation process of the first nonlinear resistance valve plate is different from the first embodiment in that 98/13 parts by weight of plant ash is added in the raw material compounding in the step (1).
And (3) performing performance detection on the first nonlinear resistance valve plates in the same batch prepared in the second embodiment, wherein the number of the detection samples is three, and the detection samples are four to six samples respectively.
And (3) purchasing MYN type zinc oxide valve plates produced by a combined fertilizer and fortune piezoresistor factory for performance detection, wherein the number of detection samples is three, namely seven samples to nine samples.
The nine samples are tested, and the specifications of the samples are all cylinders with the diameter phi of 30mm and the height h of 4 mm.
The detection means is as follows:
(1) a universal meter is adopted to be connected with each sample in series, and the direct current voltage at two ends of the sample is measured when the sample passes through a current of 1 mA: (2) increasing the current flowing through the sample, and measuring the maximum value of the current to burn out the valve plate; (3) energy density: and testing the energy density endured by the 2ms square wave by adopting a square wave tester.
From the above table, it can be seen that:
the thickness of the zinc oxide valve plates of samples I to six is 4mm in U1mAThe lower average thickness electric field intensity is between 20 and 25V/mm, and the lower the average thickness electric field intensity value is, the higher the energy density value is; the maximum through-flow of the samples I to six is larger than that of the samples seven to nine, the maximum through-flow can reach 100A, and the average electric field strength value per millimeter of the thickness is smaller than that of the samples seven to nine.
In the second embodiment, plant ash is added into the raw materials, the average electric field intensity per millimeter of the manufactured valve plate is smaller than that of the valve plate in the first embodiment, and the maximum through-flow and energy density are larger than those of the valve plate in the first embodiment.
Example three:
the preparation process of the second nonlinear resistance valve plate is different from that of the first embodiment in that zinc oxide powder is replaced by silicon carbide powder.
Example four:
the preparation process of the second nonlinear resistance valve plate is different from the second embodiment in that zinc oxide powder is replaced by silicon carbide powder.
And (3) performing performance detection on the second nonlinear resistance valve plates in the same batch prepared in the third embodiment, wherein the number of detection samples is three, namely the first sample to the third sample:
and (3) performing performance detection on the second nonlinear resistance valve plates in the same batch prepared in the fourth embodiment, wherein the number of the detection samples is three, and the detection samples are four to six samples respectively.
The six samples are taken for detection, and the specifications of the samples are all cylinders with the diameter phi of 30mm and the height h of 4 mm.
The detection means is as follows:
(1) a universal meter is connected with each sample in series, and the direct current voltage at two ends of the sample is measured when the sample passes through 1mA current; (2) leakage current: testing the leakage current of each sample by adopting a leakage current tester, wherein the experimental voltage is 100V; (3) energy density: and testing the energy density endured by the 2ms square wave by adopting a square wave tester.
From the above table, it can be seen that: the average electric field intensity per millimeter of the silicon carbide valve plates manufactured in the third embodiment and the fourth embodiment is between 36 and 45V/mm, the energy density is higher than that of the zinc oxide valve plate under the same conditions as the zinc oxide valve plate, the leakage current is between 0.2 and 0.4mA, and the silicon carbide valve plates are approximately in an insulation state. In the fourth embodiment, plant ash is added into the raw materials, the leakage current of the manufactured valve plate is smaller than that of the silicon carbide valve plate in the third embodiment, and the energy density of the valve plate is larger than that of the silicon carbide valve plate in the third embodiment.
Example five:
a low-voltage surge protector is obtained by connecting zinc oxide valve plates and silicon carbide valve plates prepared in the second embodiment and the fourth embodiment in parallel, and can be used according to a protection object in an actual application scene in a three-phase star connection mode or a two-phase connection mode and the like, as shown in figure 1.
As shown in fig. 2, the working currents of the zinc oxide valve plate and the silicon carbide valve plate are far less than 1mA at low voltage, and since the average per-millimeter thickness electric field intensity of the zinc oxide valve plate and the silicon carbide valve plate is known, the operating voltages of the two valve plates can be selected and determined according to the respective thicknesses, and it is always ensured that the operating voltage of the silicon carbide valve plate is less than the operating voltage of the zinc oxide valve plate, and the operating voltages of the two valve plates should be greater than the normal working voltage of the protected object and less than the voltage of the protected object at the insulation level.
When the protection circuit normally operates, the protector does not work, the leakage current is almost 0, and the normal operation of the protected circuit is not influenced;
when a surge occurs in the circuit, the voltage is slightly higher than the normal working voltage at the moment, the silicon carbide valve plate in the protector starts to work, namely, the silicon carbide valve plate runs in an H2-G interval, the silicon carbide valve plate provides a discharge channel for the surge overvoltage at the moment, leakage current flows through the silicon carbide valve plate, electromagnetic energy is converted into heat energy through the silicon carbide valve plate in time, the purpose of energy consumption and demagnetization is achieved, and the protector in the interval can work for a long time because the energy density of the silicon carbide is larger than that of a common valve plate, and compared with the scheme that only a zinc oxide valve plate is used at the stage in the prior art, the action voltage is reduced, the scheme is more effective and reliable;
when overlarge surge impact and overvoltage impact come, the protector starts to convert the original work of the silicon carbide valve plate into the work of the zinc oxide valve plate through a G point, so that the effects of quickly clamping the overvoltage and absorbing the surge are achieved. In the actual operation of the protector, the H2-G section forms an energy discharge channel, so surge overvoltage cannot be generated.
At present, in the surge protection industry in China, single materials are adopted. The design idea ingeniously combines the advantages and characteristics of two materials, namely the characteristics of low leakage of the high-energy silicon carbide valve plate and rapid and stable clamping pressure of the high-energy low-field zinc oxide valve plate manufactured by a special process and a formula are utilized. Compared with the traditional protector, the novel concept has qualitative leap, and the generated surge is eliminated. The surge protector in the embodiment constructs the release channel in advance, so that surge overvoltage is not generated, and the surge with overlarge energy is directly clamped and absorbed, thereby effectively making up the defects of the traditional surge protector in a 0-100V low-voltage power system.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (3)
1. A low-voltage surge protector is characterized in that: the device comprises a first nonlinear resistance valve plate and a second nonlinear resistance valve plate which are combined into a protector in parallel, wherein the first nonlinear resistance valve plate is a zinc oxide valve plate, the average electric field intensity per millimeter thickness of the first nonlinear resistance valve plate is 20-25V/mm, the maximum through-flow is 100A, the second nonlinear resistance valve plate is a silicon carbide valve plate, the average electric field intensity per millimeter thickness of the second nonlinear resistance valve plate is 36-45V/mm, when the voltage is lower than 100V, the leakage current of the second nonlinear resistance valve plate is 0.2-0.4mA, and the action voltage of the second nonlinear resistance valve plate is smaller than that of the first nonlinear resistance valve plate;
the first nonlinear resistance valve plate comprises the following ingredients in parts by weight: 98-99 parts of zinc oxide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder;
the preparation process of the first nonlinear resistance valve plate comprises the following steps:
(1) preparing materials: weighing zinc oxide powder, conductive carbon black and a binder in corresponding parts by weight according to a formula of the first nonlinear resistance valve plate;
(2) mixing materials;
(3) drying and forming: drying the slurry mixed in the step (2), and forming by adopting a stamping type press to form a first nonlinear resistance valve plate blank;
(4) pre-burning: placing the first nonlinear resistance valve plate blank in the step (3) in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 hours;
(5) spraying: introducing hydrogen into the sintering furnace after the pre-sintering in the step (4), heating to 1400-1600 ℃, and then preserving heat for 70-75 hours to form a first nonlinear resistor valve plate semi-finished product; then, cooling the first nonlinear resistance valve plate semi-finished product to 650-750 ℃ along with a furnace, taking out, spraying aluminum electrodes on two end faces of the first nonlinear resistance valve plate semi-finished product, continuously cooling naturally, and spraying insulating paint on the side surface of the first nonlinear resistance valve plate semi-finished product;
the second nonlinear resistance valve plate comprises the following ingredients in parts by weight: 98-99 parts of silicon carbide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder;
the preparation process of the second nonlinear resistance valve plate comprises the following steps:
(1) preparing materials: according to the formula of the second nonlinear resistance valve plate, weighing the silicon carbide powder, the conductive carbon black and the binder in corresponding parts by weight;
(2) mixing materials;
(3) drying and forming: drying the slurry mixed in the step (2), and forming by adopting a stamping type press to form a second nonlinear resistance valve plate blank;
(4) pre-burning: placing the second nonlinear resistance valve plate blank in the step (3) in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 hours;
(5) spraying: introducing hydrogen into the sintering furnace after the pre-sintering in the step (4), heating to 1400-1600 ℃, and then preserving heat for 70-75 hours to form a second nonlinear resistance valve plate semi-finished product; and then cooling the second nonlinear resistance valve plate semi-finished product to 650-750 ℃ along with the furnace, taking out, spraying aluminum electrodes on two end surfaces of the second nonlinear resistance valve plate semi-finished product, continuously cooling naturally, and spraying insulating paint on the side surface of the second nonlinear resistance valve plate semi-finished product.
2. A low voltage surge protector according to claim 1, wherein: the environment-friendly and environment-friendly composite material also comprises plant ash, wherein the plant ash is compounded with the zinc oxide powder and the silicon carbide powder according to the weight ratio of 1: 13.
3. A low voltage surge protector according to claim 1, wherein: the adhesive is prepared by mixing the following components in parts by weight: 25-35 parts of anionic clay, 10-15 parts of acetylene black, 5-10 parts of corn starch and 40-50 parts of water.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630998A (en) * | 2016-11-23 | 2017-05-10 | 华北科技学院 | Safe environment-friendly nonlinear piezoresistor and application thereof |
| CN107134332A (en) * | 2017-04-29 | 2017-09-05 | 国网江苏省电力公司职业技能训练基地 | A kind of non-linear cylindrical piezoresistor and its application |
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| JPS5937683A (en) * | 1982-08-25 | 1984-03-01 | 株式会社東芝 | Arrester |
| CN201319283Y (en) * | 2008-10-24 | 2009-09-30 | 白山发电厂 | Novel generator rotor demagnetization and over-voltage protecting device |
| CN101604566B (en) * | 2009-07-21 | 2011-07-20 | 中国地质大学（北京） | Zinc oxide piezoresistive material used for electrical appliances with low surge voltage and preparation method thereof |
| CN101661850B (en) * | 2009-08-27 | 2012-07-25 | 常州市明及电气技术开发有限公司 | Protector for preventing interception over-voltage and arc reignition over-voltage of vacuum circuit breaker |
| CN203180512U (en) * | 2013-03-12 | 2013-09-04 | 合肥伟创电力技术有限公司 | Low tension side power supply surge protector |
| CN110937901B (en) * | 2019-12-07 | 2021-10-22 | 常州市武进科华电力电子器材有限公司 | Preparation process of novel high-energy low-leakage ceramic valve plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630998A (en) * | 2016-11-23 | 2017-05-10 | 华北科技学院 | Safe environment-friendly nonlinear piezoresistor and application thereof |
| CN107134332A (en) * | 2017-04-29 | 2017-09-05 | 国网江苏省电力公司职业技能训练基地 | A kind of non-linear cylindrical piezoresistor and its application |
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