CN1046589C - Metal oxide lightning arrester - Google Patents
Metal oxide lightning arrester Download PDFInfo
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- CN1046589C CN1046589C CN 95100070 CN95100070A CN1046589C CN 1046589 C CN1046589 C CN 1046589C CN 95100070 CN95100070 CN 95100070 CN 95100070 A CN95100070 A CN 95100070A CN 1046589 C CN1046589 C CN 1046589C
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- metal oxide
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- arrester
- linear resistor
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Abstract
The present invention relates to an overvoltage protector in high-voltage technique, namely a metal oxide surge arrester. The present invention is characterized in that quartz sand of arc-extinguishing thermal conductivity material is filled in an isolating layer 12 between a ceramic sleeve 7 and a non-linear resistor 8 of the arrester; electric arc flashover inside a product is eradicated, the ageing of the non-linear resistor is retarded, so the service life of the product is prolonged, and the reliability of the product is increased; a disengagement and explosion protector 5 can also be arranged at the lower section of a low-voltage arrester to make the product immediately quit operation once the service life of the product is end, and the occurrence of power cut accidents of an electric power system caused by the comminuted explosion of the product is prevented; the present invention can be widely used for the overvoltage protection of transmission and distribution departments such as power plants, transformer stations, electric railways, etc.
Description
The invention belongs to a kind of overvoltage protection, be specifically related to a kind of metal oxide arrester.
The silicon-carbide series lightning arrester, because power consumption is high, high material consumption, and lightning-arrest poor-performing replaced by metal oxide arrester gradually, however existing metal oxide arrester still fundamentally do not solve because of electric arc flashover blast problem takes place in inside, influenced useful life.Be provided with pressure relief device for the high voltage lightning arrester both at home and abroad, the low-voltage lightning arrester can break away from electric power system by being connected in series when disconnector is died of old age lightning arrester automatically when operation, a kind of automatic release unit metal oxide arrester of being with is disclosed as CN92213768, be characterized in heat transferred low-melting alloy by valve block, behind the alloy melting, spring releases energy, and makes lightning arrester out of service.This lightning arrester does not solve the inner problem that the electric arc flashover takes place, and simultaneously, this kind disconnector is because spring energy-storage is little, and disengaging initial velocity is little, is difficult to breaking arc, the generation that can't solve Explosion of on Arrester, power outage.
The objective of the invention is to provides a kind of metal oxide arrester that can thoroughly solve the internal arc flashover and can break away from electric power system automatically when dying of old age at the deficiency of existing metal oxide arrester.
Metal oxide arrester of the present invention, comprise insulator, be positioned at the metal oxide non-linear resistor at center in the insulator, and be positioned at separator in the middle of insulator and the non-linear resistor, two ends are respectively by upper and lower spring up and down, caulking gum, seal cover give in sealing, and its characteristics are to be filled with in the described separator extinguishing arc thermal conductivity material.
Test shows, the inconsistent aluminium nitride of granular size paper money, aluminium oxide sand extinguishing arc, thermal conductivity is splendid, but it is very expensive, quartz sand extinguishing arc thermal conductivity is good, and the source is wide, low price, it is the material that optimum is promoted, in the RLS-50 fast acting fuse, only put the quartzy sand of 2～3 grams, at 500V, under the situation of circuit merit string factor 〉=0.3, its ultimate breaking capacity reaches 40KA, the present invention has solved existing metal oxide arrester inside up hill and dale and produces the electric arc flashover because of the voltage distributed pole is inhomogeneous and cause the problem of exploding by fill extinguishing arc thermal conductivity material in separator, has prolonged the useful life of lightning arrester greatly.
The metal oxide arrester that 35KV of the present invention is following, can also be provided with one at its insulator hypomere and break away from explosion-protection equipment, take over control punching on the explosion-protection equipment, non-linear resistor, pass through upper spring, top cover labyrinth and top high-voltage connection bolt join, lower spring is passed through in its underpart, lower sealing cover and bottom low pressure connection bolt join, explosion-protection equipment then comprises a pressure pipe, constantan wire on the insulation mandrel is housed in the pipe, tungsten filament and the steel bushing that propellant is housed, pressure pipe is equipped with the fuse of imbedding in the quartz sand outward, constantan wire, tungsten filament series connection back is by conductive strips, and the plate washer that conducts electricity up and down is in parallel with fuse.
Be described further below in conjunction with the structure of accompanying drawing metal oxide arrester of the present invention.
Fig. 1 is the structural representation of metal oxide arrester of the present invention.
Fig. 2 is that metal oxide arrester of the present invention breaks away from the explosion-protection equipment structural representation.
Fig. 3 is that metal oxide arrester of the present invention breaks away from explosion-protection equipment structure working principle schematic diagram.
As shown in Figure 1, general high voltage (when 35KV is above) lightning arrester comprises that the boundary is in the separator 12 between 8 of insulator 7 and the metal oxide non-linear resistors, resistor disc is respectively by upper and lower spring 10,3 and seal cover 9,2 and connection bolt 11 up and down, 1 joins, owing to be filled with extinguishing arc heat conduction material in the separator, produce the electric arc flashover because of the voltage distributed pole is inhomogeneous and cause the problem of exploding thereby solved existing metal oxide arrester inside, prolonged the useful life of lightning arrester greatly.For low-voltage (35KV is following) lightning arrester, insulator 7 hypomeres at above-mentioned lightning arrester are provided with a disengaging explosion-protection equipment 5, on take over control punching 6, non-linear resistor 8, by upper spring 10, top cover labyrinth 9 is connected with top connection bolt 11, the bottom is by lower spring 3, lower sealing cover 2 is connected with bottom connection bolt 1, as shown in Figure 2, this disengaging explosion-protection equipment has a pressure pipe 54, constantan wire 51 on the insulation mandrel 52 is housed in the pipe, tungsten filament 59 and the steel bushing 57 that propellant 58 is housed, the outer fuse of imbedding in the quartz sand 53, the constantan wire 51 of being equipped with of pipe, tungsten filament 59 series connection backs are by conductive strips 56, the plate washer 55 that conducts electricity up and down is in parallel with tungsten filament 53.
As shown in Figure 3, under the situation of normal voltage operation, because nonlinear resistance R0 is in state of insulation, the electric current that flows through lightning arrester is less than 100 μ A, but under the surge voltage effect, nonlinear resistance R0 is in ON state, big electric current arrives ground by the resistance r3 of R0 and fuse 53, and the constantan wire inductance L, constantan wire resistance r1, the impedance of tungsten filament 59 resistance r2 generally is 1500 times of r3 at least, so flow through L, r1, the electric current of r2 is minimum, heating tungsten filament temperature is very low, behind the lightning arrester long-play, R0 laborization, resistance reduces to increase gradually by the electric current of r3 gradually, when electric current is raised to a certain set point, r3 fusing produces electric arc, and electric arc is cut off by quartz sand, electric current will pass through L this moment, r1, r2, r2 is produced electric arc by big current fusing, lights propellant 58 (HT powder) and produces gases at high pressure, and steel bushing 57 is released, bump lower sealing cover 2, at first rush at earth stud 1 underground, cut off electric current, simultaneously seal cover 2 is washed open a hole, the gases at high pressure in the lightning arrester are discharged, guarantee that lightning arrester withdraws from electric power system automatically, avoid the comminuted blast of lightning arrester and cause the generation of grid power blackout accident.
When actual fabrication breaks away from explosion-protection equipment, the size of r3 is by the nominal current of lightning arrester, the square wave discharge capacity, the material and the shape thereof of fuse decide, and the r3 fuse is at 18 nominal electric currents, the square wave discharge capacity should not be blown under impacting, but must be molten disconnected in 1 second under 100 peaces, L1, r1, the r2 total impedance should be more than 1500 times of r3, the lightning arrester of 1.0KV for example, L can be that 0.01 constantan wire coiled diameter is 10, the inductance of 20～30 circles, r1 (constantan wire) is 50～80 Ω, r2 (tungsten filament) is 0.2～1.0 Ω, and r3 (can be three filamentary silvers) is 0.1～0.5m Ω.Embodiment 1:
The 35KV lightning arrester, external diameter 190mm, high 600mm, internal diameter 80mm, the non-linear resistor of interior dress φ 56 * 560mm, pack in the separator quartz sand of sphere diameter about 0.3～0.6, made big electric current 20KA in December, 94 at national High-Voltage Electrical Appliances quality testing center (Xi'an), the pressure of little electric current 0.8KA discharges (explosion-proof) test, and big electric current was by 0.2 second time, 0.5 second conduction time of little electric current, twice test pressure releasing device all moves, and product is not blasted, and result of the test is qualified, and the 35KV lightning arrester of similar no quartz sand, external diameter φ 220mm, high 850mm, internal diameter φ 112mm, not only volume is big, and is difficult to realize that explosion-proof pressure discharges.Embodiment 2:
The 10KV lightning arrester, all do not develop the like product that has pressure relief device at present both at home and abroad, therefore when the product electrical characteristic becomes bad, can blast, take to be connected in series the way of disconnector abroad, electrical characteristic become bad do not blast as yet before, the disconnector action makes lightning arrester break away from electrical network, and is out of service, avoid blast, domestic then taking made regular check on, and the more bad product of transformation reduces the generation of product explosion accident as far as possible.
A kind of low-voltage 10KV lightning arrester of the present invention, external diameter φ 110mm, high 260mm, internal diameter 60mm, epimere is equipped with the non-linear resistor of φ 35 * 22, fill sphere diameter 0.3～0.6 quartz sand in the separator, the hypomere quick-fried disconnector of setting up defences, the copper wire of its fuse r3 ≈ 0.3m Ω, the tungsten filament of heater r2=1 Ω, r1=60 Ω constantan wire, L is r1 constantan wire coiled φ 10,20 circle inductance fill up the quartz sand that arc extinguishing is used around molten silk r3, carry out 5KA through-flow time 0.2 second through national High-Voltage Electrical Appliances quality testing center (Xi'an) in December, 94,0.8KA 1 second through-flow time type approval test, find: the lower end connection bolt reliably breaks away from, the lower end seal cover is washed the hole of an about 20mm of diameter open, and the hyperbar that inside is produced has discharged, and does not blast.
Claims (3)
1. metal oxide arrester, comprise the metal oxide non-linear resistor (8) that is positioned at the center in insulator (7), the insulator and be positioned at insulator and the separator (12) of non-linear resistor centre, non-linear resistor is respectively by upper and lower spring (10,3), seal cover (9), (2), with upper and lower connection bolt (11,1) joins, it is characterized in that being filled with in the described separator (12) extinguishing arc thermal conductivity material.
2. metal oxide arrester as claimed in claim 1 is characterized in that described extinguishing arc thermal conductivity material is a quartz sand.
3. metal oxide arrester as claimed in claim 1 or 2, it is characterized in that insulator 7 hypomeres are provided with one and break away from explosion-protection equipment (5), take over control punching (6) on this explosion-protection equipment, non-linear resistor (8), upper spring (10), top cover labyrinth (9), high-voltage connection bolt (11), the bottom is by spring (3), lower sealing cover (2) is joined with low pressure wiring screw (1), and described disengaging explosion-protection equipment (5) comprises a pressure pipe (54), constantan wire (51) on the insulation mandrel (52) is housed in the pipe, the tungsten filament 53 and steel bushing (57) of propellant (58) is housed, pressure pipe is equipped with the fuse of imbedding in the quartz sand (53), constantan wire (51) outward, tungsten filament (59) series connection back is by conductive strips (56), and the plate washer (55) that conducts electricity up and down is in parallel with fuse (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95100070 CN1046589C (en) | 1995-01-24 | 1995-01-24 | Metal oxide lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95100070 CN1046589C (en) | 1995-01-24 | 1995-01-24 | Metal oxide lightning arrester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127922A CN1127922A (en) | 1996-07-31 |
| CN1046589C true CN1046589C (en) | 1999-11-17 |
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ID=5073233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95100070 Expired - Fee Related CN1046589C (en) | 1995-01-24 | 1995-01-24 | Metal oxide lightning arrester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1046589C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10136617C1 (en) * | 2001-07-17 | 2002-10-10 | Siemens Ag | Surge arrester for use in power transmission networks comprises several varistor blocks which have coating which initiates arc-over when its temperature exceeds preset value |
| DE102011001509B4 (en) * | 2011-03-23 | 2016-04-07 | Phoenix Contact Gmbh & Co. Kg | Surge protection device |
| CN103151123A (en) * | 2013-03-07 | 2013-06-12 | 江苏新澳电力技术有限公司 | Porcelain insulator with wire breakage preventing function |
| CN110987456A (en) * | 2019-11-18 | 2020-04-10 | 上海新力动力设备研究所 | Engine simulation device for ignition device test |
-
1995
- 1995-01-24 CN CN 95100070 patent/CN1046589C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1127922A (en) | 1996-07-31 |
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