CN109360701A - A kind of low voltage surge arrester with built-in disconnector - Google Patents
A kind of low voltage surge arrester with built-in disconnector Download PDFInfo
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- CN109360701A CN109360701A CN201811309452.2A CN201811309452A CN109360701A CN 109360701 A CN109360701 A CN 109360701A CN 201811309452 A CN201811309452 A CN 201811309452A CN 109360701 A CN109360701 A CN 109360701A
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- low voltage
- voltage surge
- surge arrester
- low
- arrester
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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
-
- 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 kind of low voltage surge arrester with built-in disconnector belongs to arrester field.Built-in type hot melt is arranged in low voltage surge arrester and is detached from component for it, using low-temperature heat melting mode and quick-disconnecting structure, in the work range of nominal tension lower than 1kV, make full use of the low voltage surge arrester heat that valve block/resistor disc generates in failure, melt heat fusing medium, cause storage pressing spring movement, and then realize failure arrester from automatic hot melten type " disengaging " function in system on low voltage surge arrester, the further expansion of accident can be prevented；On the other hand, apparent visibility flag can be provided to the low voltage surge arrester that failure exits, personnel easy to repair have found that fault point is safeguarded and replaced in time.For its resistor disc in low voltage surge arrester i.e. by thermal runaway, short circuit current will generate preceding movement, so that the arrester of damage is logged off, to avoid accident caused by short circuit current.It can be widely used for the fields such as the design, manufacture or operation and maintenance of 1kV to 0.5kV or less operating voltage low voltage surge arrester.
Description
Technical field
The invention belongs to arrester field more particularly to a kind of lightning-arrest dresses for low-voltage power system overvoltage protection
It sets.
Background technique
Arrester is for protecting electrical equipment against transient overvoltage (lightning stroke, operation, steep wave) harm and cutting off rapidly
A kind of electrical installation of power frequency continued flow, it is usually in parallel with protected circuit or equipment.
Its internal main element is nonlinear resistance (such as zinc oxide resistance sheet), due to its it is good non-linear thus
It is in high-impedance state under normal power-frequency voltage, arrester will not act.Lightning arrestor movement resistor disc is connected when overvoltage occurs, excessively electric
Pressure dash current leaks into the earth after absorbing portion of energy by resistor disc, to carry out cutting width to overvoltage, reduction is set by protection
The standby overvoltage value being subjected to, limits the overvoltage of power supply line, to protect the insulation of electrical equipment, to reach protection electric power
The effect of equipment.After having served as loss of voltage, arrester restores to the original state rapidly, enables a system to normal power supply.
The arrester of selection in domestic is mostly Zinc-Oxide Arrester at present, and main Types, which are divided into, gap and gapless two
Kind.There is gap arrester to be separated over the ground by gap in the line, is generally usually used in leakage conductor.Gapless arrestyer is used extensively
In the equipment such as power station, transformer and distribution line.
Arrester is classified by load voltage value, can be divided into three classes:
High pressure class: it refers to the Zinc-Oxide Arrester series of products of 66KV ratings above, can substantially be divided into 1000kV,
Seven grades of 750kV, 500kV, 330kV, 220kV, 110kV, 66kV；
Middle pressure class: it refers to that the Zinc-Oxide Arrester series in 3kV~66kV (not including the product of 66kV series) range produces
Product can substantially be divided into tetra- voltage class of 3kV, 6kV, 10kV, 35KV；
Low pressure class: it refers to the Zinc-Oxide Arrester series of products of 3KV or less (not including the product of 3kV series), substantially may be used
It is divided into tetra- voltage class of 1kV, 0.5kV, 0.38kV, 0.22kV.
In faults itself (deterioration of resistor disc dampness) and system exception breakdown ground connection can occur for gapless arrestyer.At this moment
The ground connection of duration may be formed in fault point.Even if the relay protection system in system acts, disengagement failure point and power supply
Connection.But it removed, replaced as found out the arrester damaged not in time, power supply line still can not normal transmission operation.
Separator for lightning arrester (disconnector of arrester), is to make arrester lower end in surge arrester failure
Lead (also known as ground lead) and system disconnect, with a kind of device of removal system sustained fault.It is used in series with arrester,
When abnormal break down occurs in arrester, act disconnector using fault current, it is automatic to disconnect the arrester that breaks down
Ground terminal prevents the further expansion of accident so that failure arrester is out of service.
Disconnector, which is pressed, uses principle and performance, can be divided into hot melten type (also known as thermal fusion, similarly hereinafter) disconnector and heat explosion type
Disconnector two major classes.
Hot melten type disconnector makes the alloy fuse piece in disconnector fuse using the fault current flowed through in failure arrester
Reach disengaging purpose.Typical hot melten type disconnector such as Authorization Notice No. is CN 2424526Y, and authorized announcement date is 2001 3
Shown in the utility model patent " highly sensitive and reliable and stable thermal fusion disconnector " on the moon 21, this will not be detailed here.
Heat-explosion type disconnector be using flow through failure it is lightning-arrest in fault current electric arc is generated in disconnector, ignite thermal explosion
Element reaches disengaging purpose.Typical heat-explosion type disconnector such as Publication No. CN 101477861A, publication date are 2009 7
Shown in the Chinese invention patent application " heat-explosion type disconnector of arrester " on the moon 8, this will not be detailed here.
Existing external hot melten type disconnector or heat-explosion type disconnector are only applicable to high, medium voltage network, can not be applied to
In 1kV and 0.5kV voltage low-pressure system below.To find out its cause, being voltage rating/operation due to arrester in low-pressure system
Voltage is low, does not puncture the air gap between two electrodes, and electric arc can not be generated in heat-explosion type disconnector, causes heat explosion type de-
From device the purpose of lead " disengaging " can not be grounded by igniting thermal explosion element.And hot melten type disconnector is due to being external make
With the heat transfer that fault current generates is less than disconnector, therefore disconnector can not act.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of low voltage surge arresters with built-in disconnector.It is in low pressure
Built-in type hot melt is set in arrester and is detached from component, using low-temperature heat melting mode and quick-disconnecting structure, in the work for being lower than 1kV
In the range of nominal tension, the low voltage surge arrester heat that valve block/resistor disc generates in failure is made full use of, heat fusing medium is melted,
Cause storage pressing spring movement, and then realizes failure arrester from the automatic hot melten type " disengaging " in system on low voltage surge arrester
Function can prevent the further expansion of accident；On the other hand, apparent visibility can be provided to the low voltage surge arrester that failure exits
Mark, personnel easy to repair have found that fault point is safeguarded and replaced in time.
The technical scheme is that providing a kind of low voltage surge arrester with built-in disconnector, including kept away positioned at low pressure
Top crown, bottom crown in thunder device ontology and the valve block between upper and lower pole plate, and for connecting with ground line or earthing pole
The ground lead connect, it is characterized in that:
In the front end of ground lead metal core wire, suit one first disengaging sleeve of setting；First is detached from the lower end of sleeve
It is provided with retention bead；
It is detached from the top of sleeve between bottom crown lower end surface first, a low-temperature heat melting dielectric layer is set；
In the periphery that first is detached from sleeve, suit one the first spring of setting；
First spring is arranged in bottom crown lower end surface and first and is detached between the retention bead of sleeve lower end, is in
It is pressurized, the state with pre- storage elastic force；
Low-temperature heat melting dielectric layer, the first disengaging sleeve and first spring, constitutes built-in type hot melt and is detached from component；
When low voltage surge arrester operates normally, the low-temperature heat melting dielectric layer is in non-melt solid states, will be low
It presses the bottom crown of arrester to be connected as one with the first disengaging sleeve and metal core wire, constitutes electric pathway, guarantee low voltage surge arrester
Normal work；
When internal fault occurs in low voltage surge arrester, the leakage current of arrester increases, and the temperature of upper and lower pole plate rises；
When bottom crown temperature be more than low-temperature heat melting dielectric layer hot melting temperature point after, the low-temperature heat melting dielectric layer into
Enter semi-molten soft state or molten condition, under the action of the first spring stores up elastic force in advance, first, which is detached from sleeve, drives grounding lead
The metal core wire of line is detached from the contact between low voltage surge arrester bottom crown, forms the cut-off point in a circuit connection, makes event
It is out of service to hinder low voltage surge arrester.
Further, on the periphery of low voltage surge arrester ontology bottom crown, a bowl-shape gum cover is set；
In the center of bowl-shape gum cover, a centre bore is set；
The metal core wire of the ground lead, first are detached from sleeve and the first spring, are arranged through the centre bore；
When internal fault occurs in low voltage surge arrester, the temperature of bottom crown is more than the hot melting temperature point of low-temperature heat melting dielectric layer
Afterwards, the metal core wire, first are detached from sleeve and the first spring, fall off from low voltage surge arrester ontology, keep away failure low pressure
Thunder device is out of service, and forms an apparent cut-off point and quickly carry out failure to help maintenance personal to find fault point rapidly
The replacement of low voltage surge arrester.
Further, in the centre bore of the bowl-shape gum cover, a guide pipe is set；The guide pipe with it is bowl-shape
It fixes as one between the centre bore of gum cover；Metal core wire, the first disengaging sleeve and first spring, coaxially runs through
It is arranged in guide pipe；
When there is internal fault in low voltage surge arrester, under the guidance and limitation of guide pipe, the metal core wire, first
It is detached from sleeve and the first spring, falls off from low voltage surge arrester ontology, keeps failure low voltage surge arrester out of service, and forms one
A apparent cut-off point quickly carries out the replacement of failure low voltage surge arrester to help maintenance personal to find fault point rapidly.
The low voltage surge arrester with built-in disconnector, it is built-in by being directly arranged on low voltage surge arrester bottom crown
Hot melt is detached from component, works in the range of nominal tension in 1kV to 0.5kV or less, makes full use of low voltage surge arrester valve in failure
The heat that piece/resistor disc generates melts heat fusing medium, causes the first spring action, realizes the automatic of failure low voltage surge arrester
Detachment function.
Specifically, the bowl-shape gum cover is the bowl-shape gum cover of silicon rubber；The open end of the bowl-shape gum cover is set up.
Low voltage surge arrester described in it, by the way that bowl-shape gum cover is arranged around bottom crown and built-in type hot melt disengaging component,
Device action response lag is caused a departure to effectively reduce the failure thermal loss of arrester.
Further, it is connected to one between the metal core wire and the first disengaging sleeve.
Internal fault described in it, including at least the internal flashover or degradation failure of low voltage surge arrester.
In the technical scheme, the low-temperature heat melting medium of the low-temperature heat melting dielectric layer is constituted, is low temperature scolding tin.
The solidus or fusing point of its low temperature scolding tin are lower than 150 degrees Celsius.
Compared with the prior art, the invention has the advantages that
1. being detached from component using low-temperature heat melting medium building built-in type hot melt, event is on the one hand realized on low voltage surge arrester
Hinder arrester from automatic " disengaging " function in system, it is ensured that failure arrester can automatically exit from operation, can prevent accident into
One step expands；On the other hand, apparent visibility flag can be provided to the arrester that failure exits, personnel easy to repair send out in time
It is safeguarded and is replaced in existing fault point；
2. built-in heat is directly arranged on the bottom crown of low voltage surge arrester melts disengaging component, it is aided with the knot of bowl-shape gum cover
Structure can be collected sufficiently, using the failure calorific value of low voltage surge arrester, be reduced because surge arrester failure thermal loss causes hot melt to be detached from
The action response of component lags, and help to realize failure low voltage surge arrester under lower operating voltage automatically disengages function；
3. low-temperature heat melting dielectric layer is combined with disengaging sleeve and the first spring, realizes low voltage surge arrester and break down
Ground lead and the first disengaging sleeve are rapidly separated afterwards, can accelerate the rapid of electrical connection between ground lead and arrester
It disconnects, the generation of electrification " arcing " phenomenon is helped avoid, to ensure the operational safety of charging operation equipment and power supply line
It is exactly in valve block/resistor disc i.e. by thermal runaway that 4. in the technical scheme, built-in type hot melt, which is detached from the effect of component,
Short circuit current will generate preceding movement, so that the arrester of damage is logged off, to avoid accident caused by short circuit current.
Detailed description of the invention
Fig. 1 is basic structure schematic diagram of the invention；
Fig. 2 is the partial enlargement structural representation that built-in type hot melt of the present invention is detached from component.
1 is low voltage surge arrester ontology in figure, and 2 be bottom crown, and 3 be bowl-shape gum cover, and 3-1 is center hole, and 4 be metal core wire, 5
It is the first spring for ground lead, 7,8 are detached from sleeve for first, and 8-1 is retention bead, and 9 be guide pipe, and 12 are situated between for low-temperature heat melting
Matter layer.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
The technical program in order to facilitate understanding easily causes the technical issues of obscuring and is explained as follows to several:
1, low voltage surge arrester is primarily used to insulation damages caused by preventing thunder and lightning, so lightning-arrest for low pressure in national standard
Device does not operate and steep impulse current residual voltage index.
2, it due to excellent non-linear of zinc oxide resistance sheet, can quickly aerial drainage and be reduced under nominal lightning impulse current
Be struck by lightning voltage magnitude, so not having the generation of power frequency short circuit current.
3, for low voltage surge arrester, the producing cause of short circuit current is that resistor disc (also known as valve block) deterioration causes to leak
Electric current increase causes resistor disc to generate heat, and resistor disc fever more accelerates leakage current to increase, and fever successively increases, and vicious circle is made
At the thermal runaway of resistor disc, as a result resistor disc punctures to form short circuit, and power frequency short circuit electricity is formed between power supply line and the earth
Stream, causes route serious accident.
4, the usually described arc grounding is that power-frequency overvoltage generates, and is not that Lightning Over-voltage generates.
5, power supply system has neutral ground or earth-free two kinds of methods of operation.But for arrester, it is necessary to be grounded.
6, for low voltage surge arrester, the effect that built-in heat melts disengaging component (also known as disconnector) is exactly in resistor disc
I.e. by thermal runaway, short circuit current will generate preceding movement, so that the arrester of damage is logged off, to avoid caused by short circuit current
Accident.So the type approval test ampere-second characteristic test of disconnector is not short circuit current, and for earth neutral system, test
Electric current is: 20A, 200A, 800A.
7, for low voltage surge arrester, disconnector should act before short circuit current generates, and can just play corresponding guarantor
Shield effect.
In Fig. 1 and Fig. 2, technical solution of the present invention provides a kind of low voltage surge arrester with built-in disconnector, including
Top crown, bottom crown 2 in low voltage surge arrester ontology 1 and the valve block between upper and lower pole plate, and be used for and ground connection
Line or the ground lead 5 of earthing pole connection, inventive point is:
In the front end of ground lead metal core wire 4, suit one first disengaging sleeve 8 of setting；First is detached under sleeve
End is provided with retention bead 8-1；
It is detached from the top of sleeve between bottom crown lower end surface first, a low-temperature heat melting dielectric layer 12 is set；
In the periphery that first is detached from sleeve, suit one the first spring 7 of setting；
Its first spring is arranged in bottom crown lower end surface and first and is detached between the retention bead 8-1 of sleeve lower end, is in
It is pressurized, the state with pre- storage elastic force；
Above-mentioned low-temperature heat melting dielectric layer, the first disengaging sleeve and the first spring, constitutes built-in type hot melt and is detached from component；
When low voltage surge arrester operates normally, low-temperature heat melting dielectric layer is in non-melt solid states, and low pressure is taken shelter from the thunder
The bottom crown of device is connected as one with the first disengaging sleeve and metal core wire, is constituted electric pathway, is guaranteed the normal of low voltage surge arrester
Work；
When internal fault occurs in low voltage surge arrester, the temperature of bottom crown rises；
After the temperature of bottom crown is more than the hot melting temperature point of low-temperature heat melting dielectric layer, low-temperature heat melting dielectric layer enters fritting
Melt soft state or molten condition, under the action of the first spring stores up elastic force in advance, first is detached from the gold that sleeve drives ground lead
Belong to core wire and be detached from the contact between low voltage surge arrester bottom crown, forms the cut-off point in a circuit connection, make failure low pressure
Arrester is out of service.
On the periphery of low voltage surge arrester ontology bottom crown, it is provided with a bowl-shape gum cover 3；In the centre bit of bowl-shape gum cover
It sets, is provided with a centre bore 3-1；
The metal core wire of the ground lead, first are detached from sleeve and the first spring, are arranged through the centre bore；
When internal fault occurs in low voltage surge arrester, the temperature of bottom crown is more than the hot melting temperature point of low-temperature heat melting dielectric layer
Afterwards, metal core wire, first are detached from sleeve and the first spring, fall off from low voltage surge arrester ontology, move back failure low voltage surge arrester
It runs out, and forms an apparent cut-off point, to help maintenance personal to find fault point rapidly, quickly carry out failure low pressure and keep away
The replacement of thunder device.
Further, in the centre bore of the bowl-shape gum cover, an also settable guide pipe 9；Guide pipe and bowl-shape glue
It is fixed with one between the centre bore of set；Metal core wire, the first disengaging sleeve and first spring, coaxially runs through and sets
It sets in guide pipe；
When there is internal fault in low voltage surge arrester, under the guidance and limitation of guide pipe, the metal core wire, first
It is detached from sleeve and the first spring, falls off from low voltage surge arrester ontology, keeps failure low voltage surge arrester out of service, and forms one
Apparent cut-off point quickly carries out the replacement of failure low voltage surge arrester to help maintenance personal to find fault point rapidly.
The low voltage surge arrester with built-in disconnector, it is built-in by being directly arranged on low voltage surge arrester bottom crown
Hot melt is detached from component and makes full use of the failure calorific value of low voltage surge arrester in 1kV to 0.5kV or less operating voltage range, real
Showed failure low voltage surge arrester automatically disengages function.
In the technical scheme, built-in type hot melt be detached from component (abbreviation disconnector) effect be exactly i.e. will be hot in resistor disc
Collapse, short circuit current will generate preceding movement, so that the arrester of damage is logged off, to avoid accident caused by short circuit current.
In the technical scheme, disconnector should act in generation before short circuit current.
Above-mentioned bowl-shape gum cover is the bowl-shape gum cover of silicon rubber；The open end of bowl-shape gum cover is set up.
Bowl is arranged by being detached from around component in bottom crown and built-in type hot melt in low voltage surge arrester described in the technical program
Shape gum cover works in the range of nominal tension in 1kV to 0.5kV or less, makes full use of valve block/electricity in failure of low voltage surge arrester
The heat that piece generates is hindered, melts heat fusing medium and causes the first spring (i.e. storage pressing spring) movement.
It is connected to one between metal core wire and the first disengaging sleeve.
Internal fault described in it, including at least the internal flashover or degradation failure of low voltage surge arrester.
In the technical scheme, the low-temperature heat melting medium of the low-temperature heat melting dielectric layer is constituted, is low temperature scolding tin.
The solidus or fusing point of its low temperature scolding tin are lower than 150 degrees Celsius.
Technical solution of the present invention is situated between by the way that low-temperature heat melting is arranged between the bottom crown and ground lead of low voltage surge arrester
Matter layer, and it is aided with bowl-shape gum cover to effectively reduce the work calories loss of arrester, in 1kV to 0.5kV or less operating voltage model
In enclosing, " hot melten type " automatic " disengaging " function out of service with failure low voltage surge arrester of failure low voltage surge arrester is realized；
Its structure combined by being detached from sleeve and the first spring realizes ground lead and first after low voltage surge arrester breaks down
It is detached from being rapidly separated for sleeve, the rapid disconnection of electrical connection between ground lead and arrester is helped speed up, avoids electricity
Resistance piece punctures to form short circuit, and power frequency short circuit current causes the generation of route serious accident, it is ensured that charging operation equipment and power supply
The operational safety of route.
It invention can be widely used in the design, manufacture or operation and maintenance of 1kV to 0.5kV or less operating voltage low voltage surge arrester
Equal fields.
Claims (10)
1. a kind of low voltage surge arrester with built-in disconnector, including top crown, the bottom crown being located in low voltage surge arrester ontology
And the valve block between upper and lower pole plate, and the ground lead for being connect with ground line or earthing pole, it is characterized in that:
In the front end of ground lead metal core wire, suit one first disengaging sleeve of setting；First is detached from the lower end setting of sleeve
There is retention bead；
It is detached from the top of sleeve between bottom crown lower end surface first, a low-temperature heat melting dielectric layer is set；
In the periphery that first is detached from sleeve, suit one the first spring of setting；
First spring be arranged in bottom crown lower end surface and first be detached from sleeve lower end retention bead between, in by
Pressure, the state with pre- storage elastic force；
Low-temperature heat melting dielectric layer, the first disengaging sleeve and first spring, constitutes built-in type hot melt and is detached from component；
When low voltage surge arrester operates normally, the low-temperature heat melting dielectric layer is in non-melt solid states, and low pressure is kept away
The bottom crown of thunder device is connected as one with the first disengaging sleeve and metal core wire, is constituted electric pathway, is guaranteed low voltage surge arrester just
Often work；
When internal fault occurs in low voltage surge arrester, the leakage current of arrester increases, and the temperature of upper and lower pole plate rises；
After the temperature of bottom crown is more than the hot melting temperature point of low-temperature heat melting dielectric layer, the low-temperature heat melting dielectric layer enters half
Soft state or molten condition are melted, under the action of the first spring stores up elastic force in advance, first, which is detached from sleeve, drives ground lead
Metal core wire is detached from the contact between low voltage surge arrester bottom crown, forms the cut-off point in a circuit connection, keeps failure low
Press arrester out of service.
2. the low voltage surge arrester described in accordance with the claim 1 with built-in disconnector, it is characterized in that in low voltage surge arrester ontology
A bowl-shape gum cover is arranged in the periphery of bottom crown；
In the center of bowl-shape gum cover, a centre bore is set；
The metal core wire of the ground lead, first are detached from sleeve and the first spring, are arranged through the centre bore；
When internal fault occurs in low voltage surge arrester, the temperature of bottom crown is more than institute after the hot melting temperature point of low-temperature heat melting dielectric layer
Metal core wire, the first disengaging sleeve and the first spring stated, fall off from low voltage surge arrester ontology, move back failure low voltage surge arrester
It runs out, and forms an apparent cut-off point, to help maintenance personal to find fault point rapidly, quickly carry out failure low pressure and keep away
The replacement of thunder device.
3. the low voltage surge arrester of built-in disconnector is had according to claim 2, it is characterized in that in the bowl-shape gum cover
In centre bore, a guide pipe is set；It fixes as one between the centre bore of the guide pipe and bowl-shape gum cover；The gold
Belong to core wire, the first disengaging sleeve and the first spring, coaxially through setting in guide pipe；
When internal fault occurs in low voltage surge arrester, under the guidance and limitation of guide pipe, the metal core wire, first are detached from
Sleeve and the first spring fall off from low voltage surge arrester ontology, keep failure low voltage surge arrester out of service, and formation one is bright
Aobvious cut-off point quickly carries out the replacement of failure low voltage surge arrester to help maintenance personal to find fault point rapidly.
4. according to the low voltage surge arrester described in claim 1,2 or 3 with built-in disconnector, it is characterized in that described with built-in
The low voltage surge arrester of disconnector, by be directly arranged on low voltage surge arrester bottom crown built-in type hot melt be detached from component, 1kV extremely
0.5kV or less works in the range of nominal tension, makes full use of the low voltage surge arrester heat that valve block/resistor disc generates in failure,
Melt heat fusing medium, causes the first spring action, realize failure low voltage surge arrester automatically disengages function.
5. according to the low voltage surge arrester described in claim 2 or 3 with built-in disconnector, it is characterized in that the bowl-shape gum cover
For the bowl-shape gum cover of silicon rubber；The open end of the bowl-shape gum cover is set up.
6. according to the low voltage surge arrester described in claim 2 or 3 with built-in disconnector, it is characterized in that the low pressure is lightning-arrest
Bowl-shape gum cover is arranged by being detached from around component in bottom crown and built-in type hot melt in device, to effectively reduce the failure heat of arrester
Amount loss causes a departure from device action response lag.
7. the low voltage surge arrester described in accordance with the claim 1 with built-in disconnector, it is characterized in that the metal core wire with
It is connected to one between first disengaging sleeve.
8. the low voltage surge arrester described in accordance with the claim 1 with built-in disconnector, it is characterized in that the internal fault, until
It less include the internal flashover or degradation failure of low voltage surge arrester.
9. the low voltage surge arrester described in accordance with the claim 1 with built-in disconnector, it is characterized in that constituting the low-temperature heat melting
The low-temperature heat melting medium of dielectric layer is low temperature scolding tin.
10. the low voltage surge arrester of built-in disconnector is had according to claim 9, it is characterized in that the low temperature scolding tin is consolidated
Phase point or fusing point are lower than 150 degrees Celsius.
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| CN201811309452.2A CN109360701B (en) | 2018-11-05 | 2018-11-05 | Low-voltage lightning arrester with built-in disconnector |
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| CN201811309452.2A CN109360701B (en) | 2018-11-05 | 2018-11-05 | Low-voltage lightning arrester with built-in disconnector |
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| CN109360701B (en) | 2020-08-14 |
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