CN210349473U - Composite insulator device with built-in piezoresistor unit - Google Patents
Composite insulator device with built-in piezoresistor unit Download PDFInfo
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- CN210349473U CN210349473U CN201920549429.4U CN201920549429U CN210349473U CN 210349473 U CN210349473 U CN 210349473U CN 201920549429 U CN201920549429 U CN 201920549429U CN 210349473 U CN210349473 U CN 210349473U
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Abstract
The utility model discloses a composite insulator device of built-in piezo-resistor unit, include: the device comprises a piezoresistor unit, an insulating strut, an arc quenching gap enhancing unit and an installation hardware fitting; the piezoresistor unit comprises a piezoresistor subunit core, an insulation core rod and a piezoresistor unit insulation outer sleeve, and the enhanced arc quenching gap unit comprises an arc quenching cavity, an insulation support piece and a gap electrode; the reinforced arc quenching gap units are fixedly arranged at two ends of the insulating support or are uniformly arranged along the axial direction of the insulating support. The lightning arrester and the insulator are integrated, and meanwhile, the rated voltage of the piezoresistor unit is reduced by utilizing the strong arc extinguishing capability of the enhanced arc extinguishing type gap unit, so that the miniaturization, the light weight and the low manufacturing cost of the device are realized; the device finishes assembly when leaving a factory, does not need to adjust assembly parts on site, does not need to strip a wire insulating layer when being connected with an insulated wire, and is simple and convenient to install and construct.
Description
Technical Field
The utility model relates to a lightning grounding technical field, concretely relates to composite insulator device of built-in piezo-resistor unit.
Background
The existing lightning arrester with the external series gap adopts a structure that the lightning arrester body is connected with a pure air gap in series or a gap with a supporting piece, and is limited by inherent insufficient stability of the open-type external series gap interruption power frequency follow current and incapability of supporting the research of the long-gap power frequency follow current interruption test under the current stage test condition, so that the arc extinguishing capability of the external series gap cannot be deeply and finely utilized, and the existing lightning arrester with the external series gap has the problems that the rated voltage value of the existing lightning arrester body with the external series gap is higher, the device is large in size, large in weight, high in overall cost and large in consumption of manpower and; the lightning arrester with the out-of-band series gap and the line insulator are independently designed and produced in a traditional mode, the lightning arrester and the line insulator are assembled on site, the production link consumption is large, the site installation operation is complex, the occupied space of the lightning arrester is reduced, and adverse effects are brought to later-stage live working. The above defects cause high lightning protection comprehensive cost when the lightning arrester with the out-of-band series gap is adopted in the current engineering.
SUMMERY OF THE UTILITY MODEL
The present invention aims to solve at least one of the technical problems in the related art to a certain extent.
Therefore, the utility model provides a composite insulator device with the integrated design of outband series gap arrester and circuit suspension composite insulator, simplifies production processes, reduces the material loss, reduces the device volume, adopts the reinforcing to put out the arc formula clearance and replaces pure air gap or take the support piece clearance simultaneously, reduces the rated voltage of piezo-resistor unit.
In order to achieve the above object, an embodiment of the present invention provides a composite insulator device, the composite insulator device includes: the device comprises a piezoresistor unit, an insulating support, an arc quenching gap strengthening unit and an installation hardware fitting.
The piezoresistor unit comprises a piezoresistor subunit core body, an insulation core rod and a piezoresistor unit insulation outer sleeve, wherein the piezoresistor subunit core body comprises a resistor disc, a potential leading-out electrode and a curing sleeve.
The resistor disc is axially and uniformly arranged, the potential leading-out electrode is positioned at the tail end of the outer side of the resistor disc in the axial direction, the resistor disc and the potential leading-out electrode are axially stacked and pressed tightly, and the curing sleeve coats the resistor disc and the local outer surface of the potential leading-out electrode.
The insulating support column comprises an insulating core rod and an insulating support column insulating outer sleeve.
The insulation core rod axially penetrates through the piezoresistor subunit core body and the insulation support; the outer surface and the end face of the piezoresistor subunit core, the inner surface of the piezoresistor subunit core and gaps between the outer surfaces of the insulating core rods, and the outer surface of the insulating core rod corresponding to the insulating support rod are integrally coated, filled with a piezoresistor unit insulating sleeve and an insulating support rod insulating sleeve, wherein the piezoresistor unit insulating sleeve and the insulating support rod insulating sleeve are made of silicon rubber composite materials and are molded by one-step molding, and the piezoresistor unit insulating sleeve and the insulating support rod insulating sleeve form an umbrella skirt shape.
The reinforced arc quenching gap unit comprises an arc quenching cavity, an insulating support part and a gap electrode; the reinforced arc quenching gap units are fixed at two ends of the insulating support or are uniformly distributed along the axial direction of the insulating support.
The piezoresistor subunit core is fixed on the mounting hardware fitting through the second connecting part of the potential leading-out electrode.
According to the utility model discloses an embodiment, the cavity of putting out an arc is the ring form, includes two cavity unit sections of putting out an arc at least.
According to the utility model discloses an embodiment, insulating support piece is located the wheel hub position of putting off the arc cavity, the clearance electrode is located the wheel hub position and the spoke side of putting off the arc cavity, two clearance electrodes that put off the arc cavity unit festival spoke side are corresponding to become a sharp and are arranged.
The gap electrodes are positioned on the spoke side of the arc quenching cavity and are symmetrically arranged in pairs in a curved surface formed by the two arc quenching cavity unit sections and the insulating support.
According to an embodiment of the present invention, the first connecting portion of the potential leading-out electrode is electrically connected to the gap electrode adjacent thereto.
According to the utility model discloses an embodiment, the cavity unit festival that puts out an arc is followed insulating pillar axial evenly distributed forms the series connection discharge channel.
According to an embodiment of the utility model, the cavity unit section of putting out an arc includes at least one air gap cavity, the air gap cavity includes: the arc quenching chamber comprises an insulating outer sleeve, an arc quenching electrode, an isolation air chamber, an air jet and an insulating core rod of the arc quenching chamber.
According to the utility model discloses an embodiment, the electrode of putting off arc is arranged in pairs in the air gap cavity, the electrode of putting off arc is the solid spheroid, and the material is steel or copper, the electrode spheroid diameter range of putting off arc is 8mm ~ 18mm, and is adjacent the shortest distance scope between the electrode of putting off arc is 2mm ~ 20 mm.
According to the utility model discloses an embodiment, the insulating plug material of cavity of putting off arc is epoxy glass fiber drawing rod, the insulating plug cross-section of cavity of putting off arc is square, the insulating plug side length scope of cavity of putting off arc is 5mm ~ 30 mm.
According to the utility model discloses an embodiment, the air vent is located on the insulating overcoat positive outside surface body of cavity of putting off arc, the air vent is cylindrical, the circular cross-section diameter scope of air vent is 2mm ~ 6 mm.
According to an embodiment of the utility model, the insulating plug of cavity of putting off arc is followed the insulating overcoat of cavity of putting off arc, close on air gap chamber cavity runs through the setting.
The composite insulator device provided by the utility model has the electrical insulation performance and mechanical strength of the conventional line insulator, and can play a role in supporting and fixing the conducting wire; meanwhile, the lightning protection function is realized, the ground flashover path of the lead subjected to lightning stroke can be limited, the stable discharge action voltage is maintained, the power frequency follow current can be reliably interrupted after the lightning stroke, and the lead and the insulator are protected from being damaged by the lightning stroke; the lightning arrester and the insulator are integrated, and meanwhile, the rated voltage of the piezoresistor unit is reduced by utilizing the strong arc extinguishing capability of the enhanced arc extinguishing type gap unit, so that the miniaturization, the light weight and the low manufacturing cost of the device are realized; the device is assembled when leaving factory, on-site adjustment of assembled parts is not needed, the insulating layer of the wire is not needed to be stripped when the device is connected with the insulated wire, and the installation and construction are simple and convenient; the piezoresistor unit of the device is divided into two sections, so that the stress is more balanced, and the piezoresistor unit has better rigidity and sealing performance; because the air gap is isolated, the power frequency operating voltage is mainly applied to the insulating support column part, and the power frequency voltage endured by the voltage dependent resistor unit for a long time is very low, so that the problem of resistor disc aging is effectively solved; the device has smooth and compact appearance, and reduces the risk of hanging foreign matters by strong wind.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings:
fig. 1 is a structural diagram of a conventional arrester with external series gaps, which is disclosed by the embodiment of the invention;
fig. 2 is another structural diagram of a conventional arrester with external series gaps according to an embodiment of the present invention;
fig. 3 is a structural view of the external form of a composite insulator device disclosed in the embodiment of the present invention;
fig. 4 is a schematic view of a cross-sectional structure of a composite insulator device along a central axis according to an embodiment of the present invention;
fig. 5 is a schematic view of a typical structure of an enhanced arc quenching gap unit of a composite insulator device according to an embodiment of the present invention;
fig. 6 is a schematic structural view of an enhanced arc quenching gap unit of a composite insulator device using a plurality of arc quenching cavity unit sections connected in series according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an internal structure of an arc extinguishing cavity of the enhanced arc extinguishing gap unit of the composite insulator device disclosed in the embodiment of the present invention.
Reference numerals: 1-a varistor unit; 2-insulating support; 3-enhancing the arc quenching gap unit; 4, mounting hardware fittings; 101-resistance card; 102-potential extraction electrode; 103-curing sleeve; 104-piezoresistor unit insulating outer sleeve; 201-insulating core rod; 202-insulating jacket of insulating support; 301-arc quenching chamber; 302-insulating support; 303 — gap electrodes; 3011 — arc quenching cavity unit section; 30100 — air gap chamber; 30101 — arc quenching cavity insulating jacket; 30102-arc quenching electrode; 30103 isolating the air chamber; 30104 air jet; 30105 insulating core rod of arc quenching chamber.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of thoroughly and completely disclosing the present invention and fully conveying the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is made in detail with reference to the flow diagram.
The main structure of the lightning arrester comprises a lightning arrester body consisting of a metal oxide resistance card and an insulating outer sleeve, and two parts of an outer series gap, which are usually installed beside a line insulator (string) in parallel. The external series gap currently used is divided into two forms: one is a pure air gap, as shown in fig. 1, which is composed of two electrodes, one electrode is fixed at the high-voltage end of the arrester body, and the other electrode is fixed on the line conductor or the lower end of the insulator string; the other is a gap with a support, as shown in fig. 2, which is composed of two electrodes fixed at two ends of the composite insulating support respectively, and the lightning discharge paths of the two forms with the outer series gap are both air gaps between the electrodes.
The effect of outer series connection clearance is that the power frequency voltage that the arrester body was born for a long time under the reduction circuit normal operating condition slows down the ageing of resistance card, reduces the operation and maintenance work load, and only after the lightning overvoltage punctured outer series connection clearance, the arrester body just can probably bear the biggest power frequency overvoltage of system for a short time (the most severe operating mode). Therefore, the rated voltage parameter of the lightning arrester body is selected according to the principle that the power frequency follow current arc can be reliably interrupted after lightning stroke action under the most severe working condition. In the existing technical standard GB/T32520-2016 technical standard "metallic oxide arrester with external series gap for overhead transmission and distribution line with over 1kV AC (alternating current) and" composite casing metallic oxide arrester for AC transmission line "DL/T815-2012 technical standard GB/T32520, the rated voltage of the arrester body is selected according to the principle, the specific selection condition is that the rated voltage is not less than (the corresponding power frequency follow current is in mA magnitude) or slightly less than (the arc extinguishing capability of the external series gap is properly considered at this time, the corresponding power frequency follow current is about a few amperes) standard specified or the maximum allowable power frequency overvoltage value of the system acceptable in engineering operation is adopted, and the typical recommended value of the rated voltage standard of the arrester body with external series gap for AC lines with different voltage levels is shown in Table 1.
TABLE 1 typical recommended value of rated voltage standard of lightning arrester body with out-of-band series gap
Although the arc quenching capacity of the outer series gap itself has been properly considered in the selection of the rated voltage of the arrester body, table 1 shows that, for rated voltages less than the maximum power frequency overvoltage of the system, the maximum deviation is not more than 5% of the maximum power frequency overvoltage, the corresponding interruption power frequency follow current is at most several amperes, and obviously, the arc quenching capacity of the outer series gap is not deeply utilized. The reason is that the long-gap power-frequency follow current interruption test cannot be carried out due to the limitation of the test conditions at the current stage, the arc extinguishing test data support is insufficient, the fine design cannot be naturally realized, and then the arc extinguishing capability of the open type outer series connection gap of the pure air gap and the gap with the supporting piece is greatly influenced by the operating environment (factors such as wind, temperature, humidity and air density), and the reliability of the device for determining the instability of the arc extinguishing performance is poor. The above reasons determine that a technical route which tries to reduce the rated voltage of the arrester body by deeply utilizing the arc extinguishing capability margin of the outer series gap cannot be realized under the structural form of the existing arrester with the outer series gap, so that the value of the rated voltage of the arrester body is higher at present.
On the other hand, the lightning arrester with the out-of-band series gap and the line insulator are independently designed and produced in a traditional mode and are assembled in a combined mode on site. Although there have been design attempts to integrate the external series gap arrester with the line insulator in recent years, the conventional gap with the support is still used for the external series gap of the integrated varistor unit (corresponding to the arrester body), so that the rated voltage of the selected varistor unit is not changed from table 1.
The lightning arrester with the out-of-band series gap in split design with the line insulator is adopted, and the main problems or defects highlighted in engineering application at present are high manufacturing cost, high installation difficulty and the like, so that the lightning arrester is limited to be popularized and applied in a power transmission and distribution overhead line in a larger range. The lightning arrester body is high in rated voltage, which means that more resistance cards are needed in manufacturing, technical problems of potential distribution, mechanical strength, explosion-proof performance and the like caused by large height need to be solved, the design and production difficulty of the lightning arrester is high, the lightning arrester and the insulator are designed in a split mode, which means that more insulating and metal materials need to be consumed, more production procedures are needed, and the manufacturing cost of the lightning arrester is high finally; the lightning arrester body is high in rated voltage, which means that the size and the weight of the lightning arrester are large, particularly for a high-voltage-class power transmission line and a lightning stroke fault high-voltage line section which is often in complex terrains such as mountains and hills, the mechanical strength of a pole tower and the space of a tower window are required to be reserved sufficiently, more manpower and material resources are required to be consumed for carrying and hoisting, in addition, the lightning arrester is assembled with an insulator on site, in order to meet the requirement of insulation fit, the gap distance is required to be manually adjusted during installation so as not to exceed the allowable deviation, and the difficulty of site installation and construction is large; the occupation of the lightning arrester further compresses the residual space of the tower head, and troubles are caused to the subsequent hot-line work. The lightning protection economic cost increased by the application defects is remarkable corresponding to the huge amount of the lightning arrester with the out-of-band series gap applied on the transmission line, wherein the total operating mileage of the overhead transmission line in China is close to 200 kilometers, the total operating mileage of the overhead distribution line exceeds 400 kilometers.
Obviously, to outband series gap arrester, if can obviously reduce the rated voltage of arrester body, improve production and installation effectiveness, can reduce device volume and weight, reduce the cost, this is to reducing engineering lightning protection cost, improves the power transmission and distribution lines and resists the thunderstorm damage risk ability, promotes circuit operational reliability and operation benefit, has important meaning.
The existing lightning arrester with the external series gap adopts a structure that the lightning arrester body is connected with a pure air gap in series or a gap with a supporting piece, and is limited by inherent insufficient stability of the open-type external series gap interruption power frequency follow current and incapability of supporting the research of the long-gap power frequency follow current interruption test under the current stage test condition, so that the arc extinguishing capability of the external series gap cannot be deeply and finely utilized, and the existing lightning arrester with the external series gap has the problems that the rated voltage value of the existing lightning arrester body with the external series gap is higher, the device is large in size, large in weight, high in overall cost and large in consumption of manpower and; the lightning arrester with the out-of-band series gap and the line insulator are independently designed and produced in a traditional mode, the lightning arrester and the line insulator are assembled on site, the production link consumption is large, the site installation operation is complex, the occupied space of the lightning arrester is reduced, and adverse effects are brought to later-stage live working. The above defects cause high lightning protection comprehensive cost when the lightning arrester with the out-of-band series gap is adopted in the current engineering. The utility model is not enough to the above-mentioned technique, a built-in piezo-resistor suspension composite insulator is put out in reinforcing is proposed, with the integrated design of outband series gap arrester and circuit suspension composite insulator, simplify the production processes, reduce the material loss, reduce the device volume, adopt the reinforcing to put out the arc formula clearance simultaneously and replace pure air gap or take the support piece clearance, utilize the reinforcing to put out the great interruption power frequency afterflow ability (kA magnitude of order) that the arc formula clearance has, and reliable and stable arc action performance of putting out, reduce the rated voltage of piezo-resistor unit. The utility model discloses compare conventional outband series connection clearance arrester and circuit insulator components of a whole that can function independently assembled mode, have that the device is small, light in weight, on-the-spot construction installation are simple and convenient, advantage such as comprehensive cost low.
In order to solve the above-mentioned not enough that exists among the prior art, the utility model provides a composite insulator device. In structural form, as shown in fig. 3 and 4, the composite insulator device comprises 4 parts of a piezoresistor unit, an insulating support, an arc quenching gap reinforcing unit and an installation hardware fitting, wherein the piezoresistor unit comprises a piezoresistor subunit core, an insulating core rod and an insulating outer sleeve, and the piezoresistor subunit core comprises a resistor disc, a potential extraction electrode and a curing sleeve. The resistance cards are axially and uniformly arranged, and the potential leading-out electrode is positioned at the tail end of the outer side of the resistance card in the axial direction. The resistor disc and the potential leading-out electrode are axially stacked and pressed tightly, and the curing sleeve coats the resistor disc and the local outer surface of the potential leading-out electrode. The piezoresistor unit is designed into two subunits with equal rated voltage, the two subunits are respectively arranged on the high-voltage side and the low-voltage side of the device, the middle parts of the two subunits are insulating support columns, in order to meet the requirement of tensile strength, the piezoresistor unit and the insulating support columns share one insulating core rod, and the insulating core rod is made of epoxy resin glass fiber drawing rods. The inner part of the piezoresistor unit is provided with annular metal oxide resistor discs, a plurality of resistor discs and two potential leading-out electrodes with the same outer diameter as the resistor discs are axially stacked and pressed, the potential leading-out electrodes are arranged on the outer sides of the resistor discs, the partial outer surfaces of all the resistor discs and the potential leading-out electrodes are coated with a curing sleeve to form a rigid body, the curing sleeve is made of glass fiber reinforced plastics, the combined body of the resistor discs, the potential leading-out electrodes and the curing sleeve is called a piezoresistor subunit core body, an insulating core rod penetrates through the middle of the two piezoresistor subunit core bodies, two ends of the insulating core rod are connected with mounting hardware fittings in a pressing mode, and the piezoresistor subunit core body is respectively screwed on the mounting hardware fittings at the high end. The outer surface of the piezoresistor subunit core, the gap between the inner surface of the piezoresistor subunit core and the outer surface of the insulating core rod corresponding to the insulating support are integrally coated and filled with silicon rubber composite materials to form an insulating outer sleeve outwards, the insulating outer sleeve is provided with an umbrella skirt, and one-time compression molding is carried out, so that the integral external insulation of the device is provided, the stability of the piezoresistor subunit core is further enhanced, and the insulating core rod is completely sealed outwards. And the reinforced arc-quenching type gap units are arranged in parallel with the insulating support columns to form an outer series gap of the piezoresistor units.
The appearance structure of the reinforced arc quenching type gap unit is shown in figure 5 and comprises an arc quenching cavity, insulating support pieces and gap electrodes, the space occupation is not too large, the arc quenching cavity is designed into a circular ring shape and is segmented into arc quenching cavity unit sections, the gap electrodes are arranged at two ends of each arc quenching cavity unit section and are supported and fixed on the surfaces of two end parts of an insulating support column through the insulating support pieces, and potential leading-out electrodes of a piezoresistor subunit core body are electrically connected with the gap electrodes of the adjacent arc quenching cavity unit sections. The gap electrode material is made of steel, the surface is galvanized, and the structural shape is specifically designed according to requirements. The number of the arc quenching cavity unit sections is not limited to 2, the arc quenching cavity unit sections are positively correlated with the line voltage grade, the arc quenching cavity unit sections are uniformly arranged along the axial direction of the insulating support column according to the design requirement, and a series discharge channel is formed, as shown in fig. 6.
The schematic diagram of the internal structure of the arc quenching cavity is shown in fig. 7, and the arc quenching cavity is composed of a plurality of air gap cavities connected in series, the series number of the air gap cavities is related to the voltage grade of the line, and the higher the voltage grade is, the more the series number is. Each air gap cavity is composed of a pair of metal arc quenching electrodes wrapped in the arc quenching cavity insulating outer sleeve and an inter-electrode isolation air chamber, each isolation air chamber is provided with an external air jet, and in order to increase the overall mechanical strength of the arc quenching cavity, an arc quenching cavity insulating core rod is arranged in the arc quenching cavity insulating outer sleeve in a penetrating mode. Specifically, the arc quenching electrode is a solid sphere made of steel or copper, and the sphere diameter is in the range of 8-18 mm; the arc quenching electrodes are equal in distance, and the shortest distance between two adjacent arc quenching electrodes ranges from 2mm to 20 mm; the insulating outer sleeve of the arc quenching cavity is made of a silicon rubber composite material; the insulating core rod material of the arc quenching cavity is an epoxy resin glass fiber drawing rod, the cross section can be long (square), and the side length range is 5-30 mm; the radial section of the air nozzle is circular, and the diameter range is 2 mm-6 mm.
The suspension type composite insulator with the built-in piezoresistor for enhancing arc extinguishing provided by the utility model has the electrical insulation performance and the mechanical strength of a conventional line insulator, and can play a role in supporting and fixing a lead; meanwhile, the lightning protection function is realized, the ground flashover path of the lead subjected to lightning stroke can be limited, the stable discharge action voltage is maintained, the power frequency follow current can be reliably interrupted after the lightning stroke, and the lead and the insulator are protected from being damaged by the lightning stroke; the lightning arrester and the insulator are integrated, and meanwhile, the rated voltage of the piezoresistor unit is reduced by utilizing the strong arc extinguishing capability of the enhanced arc extinguishing type gap unit, so that the miniaturization, the light weight and the low manufacturing cost of the device are realized; the device is assembled when leaving factory, on-site adjustment of assembled parts is not needed, the insulating layer of the wire is not needed to be stripped when the device is connected with the insulated wire, and the installation and construction are simple and convenient; the piezoresistor unit of the device is divided into two sections, so that the stress is more balanced, and the piezoresistor unit has better rigidity and sealing performance; because the space gap is isolated, the power frequency operating voltage is mainly applied to the insulating support column part, and the power frequency voltage endured by the voltage dependent resistor unit for a long time is very low, so that the problem of resistor disc aging is effectively solved; the device has smooth and compact appearance, and reduces the risk of hanging foreign matters by strong wind.
The lightning protection action process of the suspension type composite insulator with the enhanced arc extinguishing type built-in piezoresistor comprises the following steps: the overhead line group is struck by lightning, when the amplitude of the lightning overvoltage exceeds the discharge action voltage of the enhanced arc-extinguishing type built-in piezoresistor suspension composite insulator (the discharge action voltage is less than the minimum gap discharge voltage of a line insulator or a tower window, generally, the discharge action voltage is at least less than 15 percent of the minimum gap discharge voltage of the line insulator or the tower window), the air breakdown between arc-extinguishing electrodes in the enhanced arc-extinguishing gap unit is enhanced, the piezoresistor unit bears the lightning overvoltage, the low impedance characteristic is presented instantly, the lightning energy is released to the ground along the enhanced arc-extinguishing type built-in piezoresistor suspension composite insulator channel, meanwhile, a power frequency follow current electric arc is formed along the lightning impulse discharge channel, and the electric arc is divided into a plurality of short power frequency electric. The high temperature generated by the electric arc rapidly heats the air in the air gap cavity, the air expands to form air pressure difference with the outside and is sprayed out along the air spraying port, and the electric arc is stretched and lengthened in the axial direction as the electric arc root is always maintained on the surface of the arc quenching electrode and the hot air flow brings the electric arc column out of the air gap cavity together; meanwhile, the arc column is positioned in a magnetic field generated by line current and is also under the action of electromagnetic thrust. The arc column is pushed out of the air gap cavity and directly contacts with the outside air, so that the diffusion of plasma in the arc and the dissipation of heat are enhanced, and the dissociation removing process of the arc is accelerated. At the initial stage of power frequency follow current electric arc, the electric arc passageway is not enough because the particle free, arc track resistance is great, along with electric arc development, arc track resistance reduces gradually, and electric arc current rises to the maximum value when arc track resistance reduces to the minimum, afterwards, the process of going to the free of the electric arc of being promoted air gap cavity plays the domination effect to arc track resistance, and electric arc current rotates along with arc track resistance's increase again and descends, and this process is irreversible and continues the development, until arc track resistance rise to enough big messenger electric arc current reduces to zero, and power frequency follow current is prior to the voltage zero crossing usually. Research shows that the maximum interruptable power frequency follow current peak value of the enhanced arc quenching gap unit can reach 1 kA-3 kA related to design parameters, and the stability of the interruptable follow current is hardly influenced by the operating environment due to the non-open air gap, even under the condition that the insulating outer sleeve surface of the arc quenching cavity and the isolating air chamber are frozen, the interruptable follow current can still be stably interrupted, and the effective action times of the enhanced arc quenching gap unit can reach dozens of times, so that the operating requirement of the action of the matched piezoresistor unit can be completely met.
After the lightning impulse, the most harsh operating mode of piezo-resistor unit bears the biggest power frequency overvoltage of system, and the piezo-resistor unit resumes the high impedance state in the twinkling of an eye this moment, recommends under the nominal voltage value at current technical standard, and piezo-resistor unit self can restrain the power frequency afterflow at the level of several amperes at the most, directly interdiction afterflow, the utility model discloses can reduce the nominal voltage value of piezo-resistor unit, utilize the enhancement to put out the arc ability of arc clearance unit and come to interdict the power frequency afterflow that increases because of the reduction of piezo-resistor unit nominal voltage in the return circuit. Therefore, only the rated voltage of the voltage dependent resistor unit needs to be reasonably selected, so that the power frequency follow current peak value in the loop does not exceed the arc quenching capability of the enhanced arc quenching gap unitThe power frequency follow current can be effectively interrupted. For the value range of the rated voltage of the voltage dependent resistor unit, the voltage-current characteristic curve of the metal oxide resistor disc is analyzed in the typical process at the present stage, and the cross section area of the resistor disc is 615mm2To 7850mm2The voltage ratio range corresponding to the impact current of 1 kA-3 kA is about 1.3-1.5, the rated voltage of the piezoresistor unit is reduced according to the proportion, and compared with the current standard recommended value (table 1), the voltage ratio can be reduced by about 23% -33%, the reduction range is obvious, and the good design targets of miniaturization, light weight and low manufacturing cost are realized.
TABLE 2 typical metal oxide resistor disc operating impact residual voltage test results
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the above disclosed are equally possible within the scope of the invention, as would be apparent to a person skilled in the art, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A composite insulator device with built-in varistor units, said composite insulator device comprising:
the device comprises a piezoresistor unit (1), an insulating strut (2), an arc quenching gap enhancing unit (3) and an installation fitting (4);
the piezoresistor unit (1) comprises a piezoresistor subunit core body, an insulating core rod (201) and a piezoresistor unit insulating outer sleeve (104), wherein the piezoresistor subunit core body comprises resistor discs (101), potential leading-out electrodes (102) and a curing sleeve (103), the resistor discs (101) are uniformly arranged in the axial direction, the potential leading-out electrodes (102) are positioned at the tail end positions of the outer sides of the resistor discs (101) in the axial direction, the resistor discs (101) and the potential leading-out electrodes (102) are stacked and pressed in the axial direction, and the curing sleeve (103) covers the resistor discs (101) and the partial outer surfaces of the potential leading-out electrodes (102);
the insulating support column (2) comprises an insulating core rod (201) and an insulating support column insulating outer sleeve (202);
the insulation core rod (201) axially penetrates into the piezoresistor subunit core body and the insulation support column (2); gaps between the outer surface and the end surface of the piezoresistor subunit core, the inner surface of the piezoresistor subunit core and the outer surface of the insulating core rod (201), and the outer surface of the insulating core rod (201) corresponding to the insulating support (2) are integrally coated and filled with the piezoresistor unit insulating coat (104) and the insulating support insulating coat (202), the piezoresistor unit insulating coat (104) and the insulating support insulating coat (202) are made of silicon rubber composite materials and are molded by one-step molding, and the piezoresistor unit insulating coat (104) and the insulating support insulating coat (202) form an umbrella skirt shape;
the reinforced arc quenching gap unit (3) comprises an arc quenching cavity (301), an insulating support piece (302) and a gap electrode (303); the arc quenching gap strengthening units (3) are fixed at two ends of the insulating support (2) or are uniformly distributed along the axial direction of the insulating support (2);
the piezoresistor subunit core body is fixed on the mounting hardware (4) through the second connecting part of the potential leading-out electrode (102).
2. The composite insulator device according to claim 1, characterised in that the arc-quenching chamber (301) is circular and comprises at least two arc-quenching chamber unit segments (3011).
3. The composite insulator device according to claim 2, characterized in that the insulating support (302) is located at the hub position of the arc quenching cavity (301), the gap electrodes (303) are located at the hub position and the spoke side of the arc quenching cavity (301), and the gap electrodes (303) at the spoke side of the two arc quenching cavity unit sections (3011) are correspondingly arranged in a straight line.
4. A composite insulator device according to claim 1, characterised in that the first connection portion of the potential extraction electrode (102) is electrically connected to the adjacent gap electrode (303).
5. A composite insulator device according to claim 3, characterised in that the arc-quenching cavity unit segments (3011) are evenly distributed along the axial direction of the insulating support (2) forming a series discharge channel.
6. The composite insulator device according to claim 2, characterised in that the arc-quenching cavity unit section (3011) comprises at least one air gap chamber (30100), the air gap chamber (30100) comprising: the arc quenching chamber comprises an insulating outer sleeve (30101) of an arc quenching chamber body, an arc quenching electrode (30102), an isolation air chamber (30103), a gas nozzle (30104) and an insulating core rod (30105) of the arc quenching chamber body.
7. The composite insulator device according to claim 6, characterized in that the arc quenching electrodes (30102) are arranged in pairs in the air gap chamber (30100), the arc quenching electrodes (30102) are solid spheres made of steel or copper, the diameter of the sphere of the arc quenching electrodes (30102) ranges from 8mm to 18mm, and the shortest distance between adjacent arc quenching electrodes (30102) ranges from 2mm to 20 mm.
8. The composite insulator device according to claim 7, characterized in that the arc quenching cavity insulating core rod (30105) is made of epoxy resin glass fiber drawing rod, the cross section of the arc quenching cavity insulating core rod (30105) is square, and the side length of the arc quenching cavity insulating core rod (30105) ranges from 5mm to 30 mm.
9. The composite insulator device according to claim 6, characterized in that the air vent (30104) is located on a positive outer side body of the insulating outer sleeve (30101) of the arc quenching cavity, the air vent (30104) is cylindrical, and the circular cross-section diameter of the air vent (30104) ranges from 2mm to 6 mm.
10. The composite insulator arrangement according to claim 6, characterised in that the arc-quenching cavity insulating core rod (30105) is arranged through the arc-quenching cavity insulating sheath (30101) adjacent to the cavity of the air gap chamber (30100).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920549429.4U CN210349473U (en) | 2019-04-22 | 2019-04-22 | Composite insulator device with built-in piezoresistor unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920549429.4U CN210349473U (en) | 2019-04-22 | 2019-04-22 | Composite insulator device with built-in piezoresistor unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467519A (en) * | 2020-11-12 | 2021-03-09 | 广东电网有限责任公司湛江供电局 | Lightning protection device for overhead line |
| CN113922320A (en) * | 2021-10-29 | 2022-01-11 | 润世达工程有限公司 | Overvoltage protection combined lightning arrester of power system |
| CN115693406A (en) * | 2022-10-25 | 2023-02-03 | 云南电力试验研究院(集团)有限公司 | Structured medium-voltage overhead line lightning protection device |
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2019
- 2019-04-22 CN CN201920549429.4U patent/CN210349473U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467519A (en) * | 2020-11-12 | 2021-03-09 | 广东电网有限责任公司湛江供电局 | Lightning protection device for overhead line |
| CN113922320A (en) * | 2021-10-29 | 2022-01-11 | 润世达工程有限公司 | Overvoltage protection combined lightning arrester of power system |
| CN115693406A (en) * | 2022-10-25 | 2023-02-03 | 云南电力试验研究院(集团)有限公司 | Structured medium-voltage overhead line lightning protection device |
| CN115693406B (en) * | 2022-10-25 | 2023-08-15 | 云南电力试验研究院(集团)有限公司 | Structured medium-voltage overhead line lightning protection device |
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