CN109360701B - Low-voltage lightning arrester with built-in disconnector - Google Patents
Low-voltage lightning arrester with built-in disconnector Download PDFInfo
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- CN109360701B CN109360701B CN201811309452.2A CN201811309452A CN109360701B CN 109360701 B CN109360701 B CN 109360701B CN 201811309452 A CN201811309452 A CN 201811309452A CN 109360701 B CN109360701 B CN 109360701B
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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
- H01C1/00—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
Abstract
A low-voltage arrester with a built-in disconnector belongs to the field of arresters. The low-voltage arrester is internally provided with a built-in hot-melting detachment assembly, a low-temperature hot-melting mode and a quick detachment structure are adopted, heat generated by a valve plate/a resistance plate when the low-voltage arrester breaks down is fully utilized within a working rated voltage range lower than 1kV, a hot-melting medium is melted, and a pressure storage spring acts, so that an automatic hot-melting detachment function of the broken-down arrester from a system is realized on the low-voltage arrester, and further expansion of accidents can be prevented; on the other hand, the low-voltage arrester which is quitted by the fault can be provided with an obvious visibility mark, so that maintenance personnel can find out fault points in time to maintain and replace the low-voltage arrester. The resistor disc in the low-voltage arrester is about to be thermally broken down, and the short-circuit current is about to act before being generated, so that the damaged arrester is withdrawn from the system, and accidents caused by the short-circuit current are avoided. The method can be widely applied to the fields of design, manufacture, operation and maintenance of low-voltage lightning arresters with working voltages of 1kV to below 0.5kV and the like.
Description
Technical Field
The invention belongs to the field of lightning arresters, and particularly relates to a lightning arrester for overvoltage protection of a low-voltage power system.
Background
A surge arrester is an electrical device used to protect electrical equipment from transient overvoltages (lightning strikes, operation, steep waves) and to rapidly cut off power frequency follow currents, usually in parallel with the line or equipment being protected.
Its main internal element is a non-linear resistor (such as zinc oxide resistor disc), and because of its good non-linearity, it is in high-resistance state under normal power frequency voltage, and the lightning arrester can not be operated. When overvoltage occurs, the lightning arrester acts to conduct the resistor disc, overvoltage impact current absorbs partial energy through the resistor disc and then leaks to the ground, so that the overvoltage is cut, the overvoltage value suffered by protected equipment is reduced, the overvoltage of a power supply circuit is limited, the insulation of electrical equipment is protected, and the effect of protecting the electrical equipment is achieved. When the overvoltage disappears, the lightning arrester is rapidly restored to the original state, so that the system can normally supply power.
At present, most of arresters selected in China are zinc oxide arresters, and the main types of the arresters are gapless arresters and gapless arresters. Gapped arresters, which are typically commonly used for line arresters, are spaced in the line from ground by a gap. The gapless lightning arrester is widely used for equipment such as power stations and transformers and distribution lines.
The lightning arresters are classified according to rated voltage values and can be divided into three categories:
high-pressure type: the zinc oxide lightning arrester is a zinc oxide lightning arrester series product with the grade of more than 66kV, and can be roughly divided into seven grades of 1000kV, 750kV, 500kV, 330kV, 220kV, 110kV and 66 kV;
medium-pressure type: the zinc oxide lightning arrester series products in the range of 3kV to 66kV (excluding 66kV series products) can be roughly divided into four voltage levels of 3kV, 6kV, 10kV and 35 kV;
low pressure type: it refers to zinc oxide arrester series products of 3KV or less (excluding 3KV series products), and is roughly classified into four voltage classes of 1KV, 0.5KV, 0.38KV, and 0.22 KV.
The gapless lightning arrester can break down and be grounded when the gapless lightning arrester per se fails (the resistance card is affected with damp and deteriorated) and a system is abnormal. A continuous ground may then be established at the point of failure. Even if a relay protection system in the system operates, the connection between the fault point and the power supply is cut off. However, if the damaged lightning arrester cannot be found out in time for dismounting and replacing, the power supply circuit still cannot normally transmit power for operation.
A disconnector (disconnector of arrester) is a device for disconnecting the lower end lead (also called grounding lead) of the arrester from the system to eliminate the continuous failure of the system when the arrester fails. The lightning arrester disconnecting device is connected with the lightning arrester in series for use, when the lightning arrester breaks down abnormally, the disconnector is enabled to act by utilizing fault current, and the grounding end of the broken lightning arrester is automatically disconnected, so that the broken lightning arrester is quitted from running, and further expansion of accidents is prevented.
The separator can be classified into a hot-melt type (also called hot-melt type, the same applies below) separator and a thermal explosion type separator according to the principle and performance of use.
The hot melt type disconnector realizes the purpose of disconnection by fusing an alloy fuse piece in the disconnector through fault current flowing through a failure lightning arrester. A typical thermal melting type release device is disclosed in the utility model patent "high sensitive and stable thermal melting type release device" with the publication number CN 2424526Y and the publication date 3/21 in 2001, and will not be described in detail herein.
The thermal explosion type disconnector is used for generating electric arc in the disconnector by utilizing fault current flowing through failure lightning protection to detonate a thermal explosion element so as to achieve the aim of disconnection. A typical thermal explosion type disconnector is disclosed in chinese patent application "thermal explosion type disconnector for lightning arrester" published as 2009, 7, 8, CN 101477861a, and will not be described in detail herein.
The existing external hot-melting type detacher or thermal explosion type detacher is only suitable for high-voltage and medium-voltage systems and cannot be applied to low-voltage systems with the voltage below 1kV and 0.5 kV. The reason for this is that the rated voltage/operating voltage of the arrester in the low-voltage system is low, the air gap between the two electrodes cannot be broken down, and the arc cannot be generated in the thermal explosion disconnector, so that the thermal explosion disconnector cannot achieve the purpose of disconnecting the grounding lead by igniting the thermal explosion element. Since the thermal melting type detacher is externally used, heat generated by fault current cannot be transferred to the detacher, so that the detacher cannot operate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-voltage lightning arrester with a built-in disconnector. The low-voltage arrester is internally provided with a built-in hot-melting detachment assembly, a low-temperature hot-melting mode and a quick detachment structure are adopted, heat generated by a valve plate/a resistance plate when the low-voltage arrester breaks down is fully utilized within a working rated voltage range lower than 1kV, a hot-melting medium is melted, and a pressure storage spring acts, so that an automatic hot-melting detachment function of the broken-down arrester from a system is realized on the low-voltage arrester, and further expansion of accidents can be prevented; on the other hand, the low-voltage arrester which is quitted by the fault can be provided with an obvious visibility mark, so that maintenance personnel can find out fault points in time to maintain and replace the low-voltage arrester.
The technical scheme of the invention is as follows: the utility model provides a low pressure arrester with built-in disconnector, including the last polar plate that is arranged in the low pressure arrester body, bottom plate and the valve block that is arranged in between the upper and lower polar plate to and be used for the ground lead who is connected with earth connection or earthing pole, characterized by:
a first separation sleeve is sleeved at the front end of the metal core wire of the grounding lead; the lower end of the first separation sleeve is provided with a limiting bulge;
a low-temperature hot-melting medium layer is arranged between the top of the first separation sleeve and the lower end face of the lower polar plate;
a first spring is sleeved on the periphery of the first separation sleeve;
the first spring is arranged between the lower end face of the lower pole plate and the limiting bulge at the lower end of the first separation sleeve, and is in a state of being pressed and having pre-stored elasticity;
the low-temperature hot melting medium layer, the first separation sleeve and the first spring form a built-in hot melting separation assembly;
when the low-voltage arrester normally operates, the low-temperature hot-melting dielectric layer is in a non-melting solid state, and a lower pole plate of the low-voltage arrester, the first separation sleeve and the metal core wire are connected into a whole to form an electric path so as to ensure the normal operation of the low-voltage arrester;
when the low-voltage arrester has internal faults, the leakage current of the arrester is increased, and the temperatures of the upper polar plate and the lower polar plate are increased;
after the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the low-temperature hot melting dielectric layer enters a semi-molten softening state or a molten state, and under the action of the pre-stored elastic force of the first spring, the first separation sleeve drives the metal core wire of the grounding lead to be separated from contact with the lower polar plate of the low-voltage lightning arrester, so that a disconnection point on circuit connection is formed, and the low-voltage lightning arrester with faults is withdrawn from operation.
Further, a bowl-shaped rubber sleeve is arranged on the periphery of the lower pole plate of the low-voltage arrester body;
a central hole is arranged at the central position of the bowl-shaped rubber sleeve;
the metal core wire, the first release sleeve and the first spring of the grounding lead are arranged by penetrating through the central hole;
when the low-voltage arrester has an internal fault, and the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the metal core wire, the first separation sleeve and the first spring fall off from the low-voltage arrester body, so that the fault low-voltage arrester is out of operation, and an obvious disconnection point is formed, so that maintenance personnel can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
Furthermore, a guide pipe is arranged in the center hole of the bowl-shaped rubber sleeve; the guide pipe is fixedly connected with the central hole of the bowl-shaped rubber sleeve into a whole; the metal core wire, the first separation sleeve and the first spring are coaxially arranged in the guide tube in a penetrating manner;
when the low-voltage arrester has an internal fault, under the guidance and limitation of the guide pipe, the metal core wire, the first separation sleeve and the first spring fall off from the low-voltage arrester body, so that the fault low-voltage arrester is withdrawn from operation, and an obvious disconnection point is formed, so that maintenance personnel can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
According to the low-voltage arrester with the built-in disconnector, the built-in hot melting disconnecting component is directly arranged on the lower polar plate of the low-voltage arrester, so that the hot melting medium is melted by fully utilizing the heat generated by the valve plate/resistance plate when the low-voltage arrester fails within the working rated voltage range of 1kV to 0.5kV, and the first spring action is initiated, and the automatic disconnecting function of the failed low-voltage arrester is realized.
Specifically, the bowl-shaped rubber sleeve is a silicone rubber bowl-shaped rubber sleeve; the open end of the bowl-shaped rubber sleeve is arranged upwards.
The low-voltage arrester is provided with the bowl-shaped rubber sleeve around the lower pole plate and the built-in hot melting detachment component, so that the action response lag of the detacher caused by the fault heat loss of the arrester is effectively reduced.
Furthermore, the metal core wire and the first separation sleeve are fixedly connected into a whole.
The internal fault at least comprises an internal flashover or deterioration fault of the low-voltage arrester.
In the technical scheme, the low-temperature hot melting medium forming the low-temperature hot melting medium layer is low-temperature soldering tin.
The solidus point or melting point of the low-temperature soldering tin is lower than 150 ℃.
Compared with the prior art, the invention has the advantages that:
1. the built-in hot-melt separation component is constructed by adopting a low-temperature hot-melt medium, so that on one hand, the function of automatic separation of a fault lightning arrester from a system is realized on the low-voltage lightning arrester, the fault lightning arrester is ensured to automatically quit operation, and further expansion of accidents can be prevented; on the other hand, the lightning arrester which is quitted by the fault can be provided with an obvious visibility mark, so that maintenance personnel can find out fault points in time to maintain and replace the fault points;
2. the built-in hot melting separation component is directly arranged on the lower pole plate of the low-voltage arrester, and a bowl-shaped rubber sleeve structure is used as an auxiliary material, so that the fault heat productivity of the low-voltage arrester can be fully collected and utilized, the action response lag of the hot melting separation component caused by the fault heat loss of the arrester is reduced, and the automatic separation function of the fault low-voltage arrester under lower working voltage is realized;
3. the low-temperature hot-melting dielectric layer is combined with the separation sleeve and the first spring, so that the quick separation of the grounding lead and the first separation sleeve after the low-voltage arrester fails is realized, the quick disconnection of the electric connection between the grounding lead and the arrester can be accelerated, the occurrence of an electrified arc discharge phenomenon is avoided, and the running safety of electrified running equipment and a power supply line is ensured
4. In the technical scheme, the built-in hot melt separation component has the function of acting before the valve plate/resistor plate is about to be thermally broken down and short-circuit current is about to be generated, so that the damaged lightning arrester exits from the system to avoid accidents caused by the short-circuit current.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the present invention;
fig. 2 is a partially enlarged schematic view of the built-in hot melt detachment assembly of the present invention.
In the figure, 1 is a low-voltage arrester body, 2 is a lower polar plate, 3 is a bowl-shaped rubber sleeve, 3-1 is a central hole, 4 is a metal core wire, 5 is a grounding lead, 7 is a first spring, 8 is a first separation sleeve, 8-1 is a limiting bulge, 9 is a guide pipe, and 12 is a low-temperature hot melting medium layer.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
To facilitate understanding of the present technical solution, several technical problems that are easy to cause confusion are explained as follows:
1. the low-voltage lightning arrester is mainly used for preventing insulation damage caused by lightning, so that the low-voltage lightning arrester in the national standard has no operation and steep wave impact current residual voltage indexes.
2. Because of the excellent nonlinearity of the zinc oxide resistance card, the zinc oxide resistance card can quickly drain and reduce the lightning stroke voltage amplitude under the nominal lightning impulse current, so that no power frequency short-circuit current is generated.
3. For a low-voltage lightning arrester, the short-circuit current is generated because the resistance card (also called a valve plate) is degraded to cause the increase of leakage current so as to cause the heating of the resistance card, the heating of the resistance card is increased more rapidly, the leakage current is increased in sequence, the heating is increased in sequence, vicious cycle causes the thermal breakdown of the resistance card, and as a result, the resistance card is broken down to form a short circuit, and power-frequency short-circuit current is formed between a power supply line and the ground, so that vicious accidents of the.
4. Usually, the arc grounding is generated by power frequency overvoltage and not by lightning overvoltage.
5. The power supply system has two operation modes of grounding or not grounding a neutral point. But for the arrester, it must be grounded.
6. For a low-voltage lightning arrester, a built-in hot-melt separation component (also called a separator) acts before a resistor disc is about to be thermally broken down and short-circuit current is about to generate, so that the damaged lightning arrester is withdrawn from a system, and accidents caused by the short-circuit current are avoided. Therefore, the ampere-second characteristic test of the type test of the disconnector is not short-circuit current, and for a neutral grounding system, the test current is as follows: 20A, 200A, 800A.
7. For a low-voltage lightning arrester, the disconnector should be operated before the short-circuit current is generated, so as to play a corresponding protection role.
In fig. 1 and fig. 2, the technical solution of the present invention provides a low-voltage arrester with a built-in disconnector, which includes an upper polar plate and a lower polar plate 2 in a low-voltage arrester body 1, a valve plate between the upper and lower polar plates, and a grounding lead 5 for connecting with a grounding wire or a grounding electrode, and the invention is characterized in that:
a first separation sleeve 8 is sleeved at the front end of the grounding lead metal core wire 4; the lower end of the first separation sleeve is provided with a limiting bulge 8-1;
a low-temperature hot-melt medium layer 12 is arranged between the top of the first separation sleeve and the lower end face of the lower polar plate;
a first spring 7 is sleeved on the periphery of the first separation sleeve;
the first spring is arranged between the lower end surface of the lower pole plate and the limiting bulge 8-1 at the lower end of the first separation sleeve, and is in a pressed state with pre-stored elasticity;
the low-temperature hot melting medium layer, the first release sleeve and the first spring form a built-in hot melting release assembly;
when the low-voltage arrester normally operates, the low-temperature hot-melting dielectric layer is in a non-melting solid state, and a lower pole plate of the low-voltage arrester, the first separation sleeve and the metal core wire are connected into a whole to form an electric path so as to ensure the normal operation of the low-voltage arrester;
when the low-voltage lightning arrester has internal faults, the temperature of the lower polar plate rises;
after the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the low-temperature hot melting dielectric layer enters a semi-molten softening state or a molten state, and under the action of the pre-stored elastic force of the first spring, the first separation sleeve drives the metal core wire of the grounding lead to be separated from the contact with the lower polar plate of the low-voltage lightning arrester, so that a disconnection point on circuit connection is formed, and the fault low-voltage lightning arrester is withdrawn from operation.
A bowl-shaped rubber sleeve 3 is arranged on the periphery of the lower polar plate of the low-voltage arrester body; a central hole 3-1 is arranged at the central position of the bowl-shaped rubber sleeve;
the metal core wire, the first release sleeve and the first spring of the grounding lead are arranged by penetrating through the central hole;
when the low-voltage arrester has an internal fault, the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the metal core wire, the first separation sleeve and the first spring drop from the low-voltage arrester body, so that the fault low-voltage arrester is withdrawn from operation, and an obvious disconnection point is formed, so that maintenance personnel can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
Furthermore, a guide tube 9 can be arranged in the central hole of the bowl-shaped rubber sleeve; the guide pipe is fixedly connected with the central hole of the bowl-shaped rubber sleeve into a whole; the metal core wire, the first separation sleeve and the first spring are coaxially arranged in the guide tube in a penetrating manner;
when the low-voltage arrester has an internal fault, under the guidance and limitation of the guide pipe, the metal core wire, the first separation sleeve and the first spring fall off from the low-voltage arrester body, so that the fault low-voltage arrester is withdrawn from operation, and an obvious disconnection point is formed, so that a maintenance worker can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
According to the low-voltage arrester with the built-in disconnector, the built-in hot melting disconnector is directly arranged on the lower polar plate of the low-voltage arrester, so that the fault heat productivity of the low-voltage arrester is fully utilized within the working voltage range of 1kV to 0.5kV, and the automatic disconnection function of the fault low-voltage arrester is realized.
In the technical scheme, the built-in hot-melting disconnecting component (short for a disconnector) has the function of acting before the resistor disc is about to be thermally broken down and short-circuit current is about to be generated, so that the damaged lightning arrester is withdrawn from the system, and accidents caused by the short-circuit current are avoided.
In this solution, the disconnector should be operated before the short-circuit current.
The bowl-shaped rubber sleeve is a silicon rubber bowl-shaped rubber sleeve; the open end of the bowl-shaped rubber sleeve is arranged upwards.
According to the technical scheme, the bowl-shaped rubber sleeve is arranged around the lower pole plate and the built-in hot melting separation assembly, so that the heat generated by the valve plate/resistance plate of the low-voltage lightning arrester during fault is fully utilized within the working rated voltage range of 1kV to 0.5kV, and the hot melting medium is melted to cause the first spring (namely the pressure storage spring) to act.
The metal core wire and the first separation sleeve are fixedly connected into a whole.
The internal fault at least comprises an internal flashover or deterioration fault of the low-voltage arrester.
In the technical scheme, the low-temperature hot melting medium forming the low-temperature hot melting medium layer is low-temperature soldering tin.
The solidus point or melting point of the low-temperature soldering tin is lower than 150 ℃.
According to the technical scheme, the low-temperature hot-melting dielectric layer is arranged between the lower pole plate of the low-voltage arrester and the grounding lead, and the bowl-shaped rubber sleeve is used for effectively reducing the working heat loss of the arrester, so that the hot-melting type quitting operation of the fault low-voltage arrester and the automatic 'separation' function of the fault low-voltage arrester are realized within the working voltage range of 1kV to 0.5 kV; it has realized that low pressure arrester breaks down the back ground lead and the first quick breaking away from of sleeve through breaking away from the structure that sleeve and first spring combined together, helps speeding up the rapid disconnection of the electric connection relation between ground lead and the arrester, avoids the resistance card to puncture and forms the short circuit, and power frequency short-circuit current causes the emergence of the circuit malignant accident, has guaranteed the operation safety of live working equipment and power supply line.
The invention can be widely applied to the fields of design, manufacture, operation and maintenance of low-voltage lightning arresters with working voltages of 1kV to below 0.5kV and the like.
Claims (10)
1. The utility model provides a low pressure arrester with built-in disconnector, is including the last polar plate that is arranged in the low pressure arrester body, bottom plate and the valve block that is arranged in between the upper and lower polar plate to and be used for the ground lead who is connected with earth connection or earthing pole, characterized by:
a first separation sleeve is sleeved at the front end of the metal core wire of the grounding lead; the lower end of the first separation sleeve is provided with a limiting bulge;
a low-temperature hot-melting medium layer is arranged between the top of the first separation sleeve and the lower end face of the lower polar plate;
a first spring is sleeved on the periphery of the first separation sleeve;
the first spring is arranged between the lower end face of the lower pole plate and the limiting bulge at the lower end of the first separation sleeve, and is in a state of being pressed and having pre-stored elasticity;
the low-temperature hot melting medium layer, the first separation sleeve and the first spring form a built-in hot melting separation assembly;
when the low-voltage arrester normally operates, the low-temperature hot-melting dielectric layer is in a non-melting solid state, and a lower pole plate of the low-voltage arrester, the first separation sleeve and the metal core wire are connected into a whole to form an electric path so as to ensure the normal operation of the low-voltage arrester;
when the low-voltage arrester has internal faults, the leakage current of the arrester is increased, and the temperatures of the upper polar plate and the lower polar plate are increased;
after the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the low-temperature hot melting dielectric layer enters a semi-molten softening state or a molten state, and under the action of the pre-stored elastic force of the first spring, the first separation sleeve drives the metal core wire of the grounding lead to be separated from the contact with the lower polar plate of the low-voltage lightning arrester, so that a disconnection point on the circuit connection is formed, and the fault low-voltage lightning arrester is withdrawn from operation;
the low-voltage arrester is internally provided with a built-in hot-melt separation component, a low-temperature hot-melt mode and a quick separation structure are adopted, heat generated by a valve plate/a resistance sheet when the low-voltage arrester breaks down is fully utilized within a working rated voltage range lower than lkV, a hot-melt medium is melted, and a pressure storage spring acts, so that the automatic hot-melt separation function of the broken-down arrester from a system is realized on the low-voltage arrester, and further expansion of accidents can be prevented.
2. A low-voltage arrester with built-in disconnector according to claim 1, characterized in that a bowl-shaped rubber sleeve is provided on the periphery of the lower plate of the low-voltage arrester body;
a central hole is arranged at the central position of the bowl-shaped rubber sleeve;
the metal core wire, the first release sleeve and the first spring of the grounding lead are arranged by penetrating through the central hole;
when the low-voltage arrester has an internal fault, and the temperature of the lower polar plate exceeds the hot melting temperature point of the low-temperature hot melting dielectric layer, the metal core wire, the first separation sleeve and the first spring fall off from the low-voltage arrester body, so that the fault low-voltage arrester is out of operation, and an obvious disconnection point is formed, so that maintenance personnel can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
3. A low-voltage arrester with built-in disconnector according to claim 2, characterized in that a guide tube is arranged in the central hole of said bowl-shaped rubber sleeve; the guide pipe is fixedly connected with the central hole of the bowl-shaped rubber sleeve into a whole; the metal core wire, the first separation sleeve and the first spring are coaxially arranged in the guide tube in a penetrating manner;
when the low-voltage arrester has an internal fault, under the guidance and limitation of the guide pipe, the metal core wire, the first separation sleeve and the first spring fall off from the low-voltage arrester body, so that the fault low-voltage arrester is withdrawn from operation, and an obvious disconnection point is formed, so that maintenance personnel can find the fault point quickly, and the fault low-voltage arrester can be replaced quickly.
4. The low-voltage arrester with built-in disconnector according to claim 1, 2 or 3, wherein the low-voltage arrester with built-in disconnector realizes the automatic disconnection function of the failed low-voltage arrester by fully utilizing the heat generated by the valve plate/resistance plate of the low-voltage arrester during failure to melt the hot-melt medium and trigger the first spring action within the rated operating voltage range of 1kV to 0.5kV by directly arranging the built-in hot-melt disconnection assembly on the lower polar plate of the low-voltage arrester.
5. A low voltage arrester with built-in disconnector according to claim 2 or 3, characterized in that said bowl-shaped rubber sleeve is a silicone rubber bowl-shaped rubber sleeve; the open end of the bowl-shaped rubber sleeve is arranged upwards.
6. A low voltage arrester with built-in disconnector according to claim 2 or 3, characterized in that said low voltage arrester is provided with a bowl-shaped rubber sleeve around the lower plate and the built-in thermal melting disconnector assembly to effectively reduce the response delay of the disconnector due to the thermal loss of the arrester from failure.
7. A low-voltage arrester with built-in disconnector according to claim 1, characterized in that said metal core wire is fixedly connected integrally with the first disconnector sleeve.
8. A low-voltage arrester with built-in disconnector according to claim 1, characterized in that said internal faults comprise at least internal flashover or deterioration faults of the low-voltage arrester.
9. The low-voltage arrester with built-in disconnector according to claim 1, wherein the low-temperature hot-melt medium constituting said low-temperature hot-melt medium layer is low-temperature solder.
10. A low-voltage arrester with built-in disconnector according to claim 9, characterized in that said low-temperature solder has a solidus or melting point below 150 ℃.
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| CN205451958U (en) * | 2015-12-21 | 2016-08-10 | 南阳恒特电气有限公司 | Novel low voltage surge arrester |
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