CN111627622A - 10KV automatic-adjustment lightning-protection ice porcelain insulator with pressure-sensitive device and manufacturing method thereof - Google Patents
10KV automatic-adjustment lightning-protection ice porcelain insulator with pressure-sensitive device and manufacturing method thereof Download PDFInfo
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- CN111627622A CN111627622A CN202010510967.XA CN202010510967A CN111627622A CN 111627622 A CN111627622 A CN 111627622A CN 202010510967 A CN202010510967 A CN 202010510967A CN 111627622 A CN111627622 A CN 111627622A
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- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 98
- 239000012212 insulator Substances 0.000 title claims abstract description 90
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000007787 solid Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 208000025274 Lightning injury Diseases 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/46—Means for providing an external arc-discharge path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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Abstract
The invention discloses a 10KV automatic-adjustment lightning-protection ice porcelain insulator with a pressure-sensitive device and a manufacturing method thereof. Wherein, the porcelain insulator body end connected with the puncture wire clamp is a high-voltage end, and the porcelain insulator body end connected with the grounding fixing device is a low-voltage end. The lower part of the porcelain insulator body is provided with a cavity chamber, and a ZnO piezoresistor is arranged in the cavity chamber to form a whole. And an arc striking rod is arranged at the high-voltage end of the porcelain insulator body and is opposite to the lightning protection trigger connected to the ZnO piezoresistor. The invention has reasonable design, can be used in high-cold, high-temperature and high-sea areas, has simple installation and lower investment and operation maintenance cost, can effectively improve the reclosing success rate after lightning stroke failure, can improve the anti-icing flashover capability and ensures normal operation. The safety reliability and stability of long-term operation of the power grid are guaranteed.
Description
Technical Field
The invention relates to the technical field of overvoltage protection of porcelain insulators, in particular to a porcelain insulator which is made of a non-metal ceramic composite material and is provided with a pressure-sensitive device and a 10KV automatic-adjustment lightning protection ice and a manufacturing method thereof, and the porcelain insulator is used for a protection product of the lightning protection ice overvoltage of a high-medium voltage distribution (power transmission) power grid.
Background
The existing lightning-protection anti-icing composite insulator device with fiber cement composite material applied to 10KV distribution lines comprises a ball head, a composite umbrella group, a connector, an electrode ball, a wave spring, a shell, resistance cards and a core rod, wherein the resistance cards are sleeved on the core rod, and the resistance cards can be in good contact with electrodes at two ends when the product bears different mechanical tensile deformation through the wave spring, so that the through-flow performance of the resistance cards is good, and the device has a lightning-protection function. The successful development of the lightning-protection and anti-icing composite insulator obtains the approval of national electricity. However, after years of use, the following problems are found: 1. has climate selectivity and is not suitable for high-temperature and high-cold areas; 2. the machine parts are easy to age and deform; 3. The long-time transmission operation is not stable enough; 4. the replacement frequency is high; 5. the manufacturing and production cost is high; 6. secondary pollution affects the environment. In addition, the umbrella skirts of the composite coat are easily bridged by ice edges, so that ice covering flashover and even tripping accidents are caused, and the operation safety and stability of a power grid are seriously influenced.
Disclosure of Invention
In order to solve the defects, the invention aims to innovatively research and develop a ceramic insulator which is made of an inorganic non-metal ceramic composite material and has a pressure-sensitive device and is used for automatically adjusting 10KV lightning protection ice by utilizing the technical principle and characteristics of a ZnO piezoresistor and the mechanism of a main part related to a lightning protection, ice protection and rainproof ceramic umbrella skirt and a manufacturing method thereof.
The technical scheme of the invention is as follows:
a10 KV automatic-adjustment lightning protection ice porcelain insulator with a pressure-sensitive device comprises a porcelain insulator main body, a puncture wire clamp, a connector, an anti-icing porcelain umbrella skirt and a grounding fixing device; the two ends of the porcelain insulator main body are respectively provided with a piercing clamp and a grounding fixing device, wherein the piercing clamp is connected to the high-voltage end of the porcelain insulator main body, and the grounding fixing device is connected to the low-voltage end of the porcelain insulator main body; the periphery of the porcelain insulator main body is composed of an anti-icing porcelain umbrella skirt, the porcelain insulator main body is provided with an arc striking rod and a lightning protection trigger, and the arc striking rod and the lightning protection trigger are opposite in a spaced mode.
The upper part of the porcelain insulator main body close to the high-voltage end is a solid body, the lower part of the porcelain insulator main body close to the low-voltage end is a cavity, and a packaged ZnO piezoresistor is arranged in the porcelain insulator main body and is associated with the porcelain insulator main body into a whole.
The bottom of ZnO varistor is connected with the grounding fixing device, the lightning protection trigger is connected on the top of ZnO varistor, the lightning protection trigger penetrates out from the hole arranged on the porcelain insulator main body, and the terminal of the lightning protection trigger is provided with a trigger head.
A method for manufacturing a 10KV automatic-adjustment lightning protection ice porcelain insulator with a pressure-sensitive device comprises the following steps:
1) the porcelain insulator main body is respectively provided with a plurality of porcelain umbrella skirts with different sizes;
2) the two ends of the porcelain insulator body are respectively provided with a puncture wire clamp and a grounding fixing device, wherein one end of the porcelain insulator body connected with the puncture wire clamp is a high-voltage end, one end of the porcelain insulator body connected with the grounding fixing device is a low-voltage end, and the grounding fixing device is fastened on the low-voltage end of the porcelain insulator body;
3) a cavity chamber is arranged at the lower end of the porcelain insulator body, and a ZnO piezoresistor is arranged in the cavity chamber and is connected with a lightning protection trigger;
4) a joint with an arc striking rod is arranged between the high-voltage end of the porcelain insulator body and the puncture wire clamp, and the arc striking rod extends out of the porcelain insulator body;
5) adjusting the direction of an arc striking rod to enable an arc striking head of the arc striking rod to be opposite to a trigger head of the lightning protection trigger, and then fastening a puncture wire clamp and a connector on a high-voltage end of a porcelain insulator body; and (5) finishing the manufacturing.
Compared with the prior art, the invention greatly overcomes the technical defects of the prior project, has reasonable design, simple installation and lower investment and operation maintenance cost, can effectively improve the reclosing success rate after lightning stroke fault, can improve the anti-icing flashover capability and ensures normal operation. The lightning protection device can be used in high-cold, high-temperature and high-sea areas, the investment and operation maintenance cost is low, the reclosing success rate after lightning stroke faults can be effectively improved, the anti-icing flashover capacity can be improved, and the normal operation is ensured. The implementation of the invention ensures the safety reliability and stability of the long-term operation of the power grid.
Drawings
FIG. 1 is a schematic view of the structure of a porcelain insulator with a pressure-sensitive device for 10KV automatic-adjustment lightning protection ice of the invention,
fig. 2 is a current-voltage characteristic diagram of a ZnO varistor.
In the figure: 1. porcelain insulator main part, 2, puncture fastener, 3, connect, 4, anti-icing porcelain full skirt, 5, lightning protection trigger, 5.1, trigger head, 6, ZnO piezo-resistor, 7, striking stick, 7.1, striking head, 8, ground connection fixing device.
Detailed Description
The invention relates to a 10KV automatic-adjustment lightning-protection ice porcelain insulator with a pressure-sensitive device, which is shown in figure 1 and comprises a porcelain insulator main body 1, a puncture wire clamp 2, a connector 3, an anti-icing porcelain umbrella skirt 4 and a grounding fixing device 8. And the two ends of the porcelain insulator main body 1 are respectively and fixedly provided with a puncture wire clamp 2 and a grounding fixing device 8, and the porcelain insulator main body has high tensile strength. Wherein, the puncture wire clamp 2 is connected with the high-voltage end of the porcelain insulator main body 1, and the grounding fixing device 8 is connected with the low-voltage end of the porcelain insulator main body 1. The periphery of the porcelain insulator main body 1 is composed of anti-icing porcelain sheds 4, the anti-icing porcelain sheds 4 are different in size, and the first one close to the puncture wire clamp 2 must be a large shed to play a role in anti-icing. The large umbrella skirt and the small umbrella skirt can be arranged at intervals in sequence.
The lightning protection design of the invention is as follows: a joint 3 is also arranged between the puncture wire clamp 2 and the high-voltage end of the porcelain insulator main body 1 and is electrically connected with the puncture wire clamp 2. An arc striking rod 7 is connected and extends out of one side of the joint 3, the arc striking rod 7 is bent downwards and inwards, and the end is an arc striking head 7.1. The upper portion of the porcelain insulator main body 1 close to the high-voltage end is a solid body, the lower portion of the porcelain insulator main body 1 close to the low-voltage end is a cavity, the built-in packaged ZnO piezoresistor 6 is connected with the porcelain insulator main body 1 into a whole, and the built-in packaging of the ZnO piezoresistor 6 is realized by arranging an insulating layer on the inner wall of the porcelain insulator main body 1. The bottom end of the ZnO varistor 6 is electrically connected with the grounding fixing device 8, the top end is connected with a lightning protection trigger 5, the lightning protection trigger 5 penetrates out of a hole arranged on the porcelain insulator main body 1, and the terminal of the lightning protection trigger is provided with a trigger head 5.1. The lightning protection trigger 5 and the arc striking rod 7 extend out in the same direction, and the trigger head 5.1 is opposite to the arc striking head 7.1 in a spaced mode.
In the invention, the application of ZnO piezoresistor is one of the key technologies. The technical principle and characteristics of the ZnO varistor will be explained with reference to fig. 2:
the invention utilizes the characteristic principle that the ZnO piezoresistor is connected with the protected electrical equipment or components in parallel for use. When lightning overvoltage or transient operation overvoltage Vs occurs in a circuit, voltage is not directly grounded, but is led into a ground end through the ZnO piezoresistor, and the ZnO piezoresistor and protected equipment and components bear the Vs at the same time.
The current (I) -voltage (V) curve of the ZnO varistor is in a nonlinear volt-ampere characteristic, and the I-V curve can be roughly divided into 3 regions, namely a pre-breakdown region, a breakdown region and a rebound region.
A pre-breakdown region: the ZnO voltage dependent resistor has small applied voltage and high resistance, and the I-V curve is nearly linear. Of course, the ZnO pressure sensitive properties are also affected by temperature. When the voltage exceeds the inflection point, the breakdown region is entered.
A breakdown region: the ZnO varistor is an I-V nonlinear region of the ZnO varistor, and at the moment, grain boundaries are broken down, so that the resistance value of the ZnO varistor can be changed by several orders of magnitude when the voltage change is small. The flatter the curve in this region, the more sensitive the current is to changes in voltage, and the better the non-linear performance.
A rebound area: in the high current region, the nonlinear characteristic of the ZnO piezoresistor basically disappears, the grain boundary layer is conducted, and the resistance value is obviously reduced.
According to the conductive principle and characteristics of ZnO piezoresistor, it is suitable for over-currentThe response speed of the pressure is very fast, such as the products with lead wires and special electrodes, and the response time is generally less than 25 nanoseconds. Therefore, as long as the ZnO voltage dependent resistor is properly selected and used, the ZnO voltage dependent resistor has excellent inhibiting effect on the transient overvoltage appearing in the circuit, thereby achieving the purpose of protecting other elements in the circuit from being damaged by the overvoltage. ZnO pressure-sensitiveResistance (RC)The function and the characteristic of the pressure-sensitive conductivity which is automatically adjusted are provided.
The performance of the ZnO varistor is generally evaluated by a nonlinear coefficient, and the larger the value is, the better the performance of the ZnO varistor is. The values can be determined from the I-V curve of the ZnO varistor.
The faster the response speed of the ZnO varistor is, the more effective electronic components and electric power equipment can be protected. Faster response times indicate shorter response times, which typically require less than 25 ns.
The through-flow rate represents the maximum current density allowed to flow, and is generally required to be more than 2500A/cm2。
The invention also discloses a manufacturing method of the porcelain insulator with the pressure-sensitive device for the 10KV automatic-adjustment lightning protection ice, which comprises the following steps:
1) the porcelain insulator main body is respectively provided with a plurality of porcelain umbrella skirts with different sizes;
2) the two ends of the porcelain insulator body are respectively provided with a puncture wire clamp and a grounding fixing device, wherein one end of the porcelain insulator body connected with the puncture wire clamp is a high-voltage end, one end of the porcelain insulator body connected with the grounding fixing device is a low-voltage end, and the grounding fixing device is fastened on the low-voltage end of the porcelain insulator body;
3) a cavity chamber is arranged at the lower end of the porcelain insulator body, and a ZnO piezoresistor is arranged in the cavity chamber and is connected with a lightning protection trigger;
4) a joint with an arc striking rod is arranged between the high-voltage end of the porcelain insulator body and the puncture wire clamp, and the arc striking rod extends out of the porcelain insulator body;
5) adjusting the direction of an arc striking rod to enable an arc striking head of the arc striking rod to be opposite to a trigger head of the lightning protection trigger, and then fastening a puncture wire clamp and a connector on a high-voltage end of a porcelain insulator body; and (5) finishing the manufacturing.
The invention has the following function principle:
when lightning strike occurs, flashover discharge is caused between an arc striking head of the arc striking rod and a trigger head of the lightning protection trigger to form a short circuit channel, and continuous power frequency electric arc moves to the position between the arc striking head and the trigger head to burn so as to protect the insulated wire from burning. The distance between the arc striking rod and the lightning protection trigger can form a discharge loop during lightning stroke, and the discharge can still be ensured under the power frequency voltage after the lightning stroke.
When the lightning overvoltage exceeds a certain value of insulation blockage, flashover discharge is caused between the arc striking rod and the grounding fixing device to form a short circuit channel, and charges are quickly conducted to the ground through the tower through the ZnO piezoresistor, so that the circuit is protected from being damaged by the lightning overvoltage to other equipment on the circuit, and the wire is protected from being burnt.
When the whole device recovers the insulating property again after discharging, flashover can not be formed on the surface of the ceramic umbrella skirt, the umbrella skirt can not be damaged, and the insulating property of the insulator can be maintained.
The above description is a preferred embodiment of the 10KV automatic adjusting lightning protection ice porcelain insulator with a pressure sensitive device and the manufacturing method thereof, and the above embodiment is not a limitation of the present invention, and any expert and ordinary skilled in the art, etc., based on the above description, should make modifications, amendments or equivalent substitutions, and fall within the scope of protection of the present invention.
Claims (7)
1. A10 KV automatic-adjustment lightning protection ice porcelain insulator with a pressure-sensitive device comprises a porcelain insulator main body (1), a puncture wire clamp (2), a connector (3), an anti-icing porcelain umbrella skirt (4) and a grounding fixing device (8); the two ends of the porcelain insulator main body (1) are respectively provided with a puncture wire clamp (2) and a grounding fixing device (8), wherein the puncture wire clamp (2) is connected to the high-voltage end of the porcelain insulator main body (1), and the grounding fixing device (8) is connected to the low-voltage end of the porcelain insulator main body (1); porcelain insulator main part (1) periphery comprises anti-icing porcelain full skirt (4), its characterized in that:
an arc striking rod (7) and a lightning protection trigger (5) are arranged on the porcelain insulator main body (1), and the arc striking rod (7) and the lightning protection trigger (5) are opposite in a spaced mode.
2. The 10KV automatic adjusting lightning protection ice porcelain insulator with pressure sensitive device according to claim 1, wherein: a joint (3) is also arranged between the puncture wire clamp (2) and the high-voltage end of the porcelain insulator main body (1) and is electrically connected with the puncture wire clamp (2); the arc striking rod (7) is connected with the joint (3) and extends out of one side of the joint (3), the arc striking rod (7) bends downwards and inwards, and the terminal is an arc striking head (7.1).
3. The 10KV automatic adjusting lightning protection ice porcelain insulator with pressure sensitive device according to claim 1, wherein: the upper part of the porcelain insulator main body (1) close to the high-voltage end is a solid body, the lower part of the porcelain insulator main body close to the low-voltage end is a cavity, and a packaged ZnO piezoresistor (6) is arranged in the porcelain insulator main body and is associated with the porcelain insulator main body (1) into a whole.
4. The 10KV automatic adjusting lightning protection ice porcelain insulator with pressure sensitive device according to claim 3, wherein: the bottom and the ground connection fixing device (8) electricity of ZnO piezo-resistor (6) are connected, the top at ZnO piezo-resistor (6) is connected in lightning protection trigger (5), and lightning protection trigger (5) are worn out from the hole that sets up on porcelain insulator main part (1), and its terminal has one and triggers head (5.1).
5. The 10KV automatic adjusting lightning protection ice porcelain insulator with pressure sensitive device according to claim 1, 2 or 4, characterized in that: the lightning protection trigger (5) and the arc striking rod (7) extend out in the same direction, and the trigger head (5.1) is opposite to the arc striking head (7.1) in a spaced mode.
6. The 10KV automatic adjusting lightning protection ice porcelain insulator with pressure sensitive device according to claim 1, wherein: the size of the anti-icing porcelain umbrella skirt (4) is different, the first umbrella skirt close to the puncture wire clamp (2) is a large umbrella skirt, and the large umbrella skirt and the small umbrella skirt are sequentially arranged at intervals.
7. A method for manufacturing a 10KV automatic-adjustment lightning protection ice porcelain insulator with a pressure-sensitive device is characterized by comprising the following steps:
1) the porcelain insulator main body is respectively provided with a plurality of porcelain umbrella skirts with different sizes;
2) the two ends of the porcelain insulator body are respectively provided with a puncture wire clamp and a grounding fixing device, wherein one end of the porcelain insulator body connected with the puncture wire clamp is a high-voltage end, one end of the porcelain insulator body connected with the grounding fixing device is a low-voltage end, and the grounding fixing device is fastened on the low-voltage end of the porcelain insulator body;
3) a cavity chamber is arranged at the lower end of the porcelain insulator body, and a ZnO piezoresistor is arranged in the cavity chamber and is connected with a lightning protection trigger;
4) a joint with an arc striking rod is arranged between the high-voltage end of the porcelain insulator body and the puncture wire clamp, and the arc striking rod extends out of the porcelain insulator body;
5) adjusting the direction of an arc striking rod to enable an arc striking head of the arc striking rod to be opposite to a trigger head of the lightning protection trigger, and then fastening a puncture wire clamp and a connector on a high-voltage end of a porcelain insulator body; and (5) finishing the manufacturing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510967.XA CN111627622A (en) | 2020-06-05 | 2020-06-05 | 10KV automatic-adjustment lightning-protection ice porcelain insulator with pressure-sensitive device and manufacturing method thereof |
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| CN202010510967.XA CN111627622A (en) | 2020-06-05 | 2020-06-05 | 10KV automatic-adjustment lightning-protection ice porcelain insulator with pressure-sensitive device and manufacturing method thereof |
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