CN2824252Y - Explosion prevention device for high capacity metal oxide voltage limiter - Google Patents
Explosion prevention device for high capacity metal oxide voltage limiter Download PDFInfo
- Publication number
- CN2824252Y CN2824252Y CN 200520106566 CN200520106566U CN2824252Y CN 2824252 Y CN2824252 Y CN 2824252Y CN 200520106566 CN200520106566 CN 200520106566 CN 200520106566 U CN200520106566 U CN 200520106566U CN 2824252 Y CN2824252 Y CN 2824252Y
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- arc
- pilot arc
- explosion
- metal oxide
- utility
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Abstract
The utility model discloses an explosion-proof device for high-capacity metal-oxide voltage limiters. The utility model is composed of two sections of pilot arc channels which are respectively arranged on an upper and a lower electrodes of a core body of a large-capacity metal-oxide voltage limiter. The pilot arc channels are round pilot arc channels and composed of more than two arc-shaped pilot arc rods which are mutually enclosed, or the pilot arc channels are polygon-shaped pilot arc channels and composed of more than two straight or curved pilot arc rods which are mutually enclosed. The tail pars and the head parts of all arc-shaped pilot arc rods are provided with position difference. One end of each arc-shaped pilot arc rod is fixed on the electrode, and is electrically communicated with the electrode; the other end can be fixed on the electrode through an insulating block. The utility model has obvious explosion-proof effect, and does not affect the self characteristic of heat dispersion, etc. of the voltage limiter. The utility model can ensure that an explosion-proof film is exploded first as low-current voltage relief or heavy-current voltage relief, and a ceramic sleeve is unbroken. The utility model thoroughly eliminates the potential hazard of MOV ceramic-sleeve explosion.
Description
Technical field
The utility model belongs to electrical equipment technical field, relates in particular to a kind of large capacity metal oxide pressure-limiting device explosion-protection equipment.
Background technology
The lightning arrester of porcelain insulating overcoat sealing when inner valve block thermal runaway or other fault, can cause lightning arrester inside to produce immense pressure in a short period of time.If there is not pressure to discharge measure, will make the insulator blast, broken ceramics can injure surrounding devices even crisis operations staff's safety.Therefore present porcelain insulating coat lightning arrester both domestic and external has all been installed rupture pressure disc at its two ends.Its principle has designed the pressure weak link at lightning arrester insulator two ends exactly; when lightning arrester normally moves; rupture pressure disc plays sealing function; when the inner generation of lightning arrester immense pressure; because rupture pressure disc is fragile more a lot of than insulator; so rupture pressure disc at first breaks under immense pressure, pressure obtains discharging, thereby has protected insulator.
Though present porcelain insulating coat lightning arrester both domestic and external has all been installed rupture pressure disc, improper or other reason owing to selecting for use of rupture pressure disc, being in operation still has the accident of Explosion of on Arrester to take place.Therefore there is a lot of lightning arrester manufacturer to adopt the preventing arc barrel structure, promptly between lightning arrester insulator inwall and valve block post, added protective layer, make not direct contact arc of insulator, playing certain effect aspect the lightning arrester insulator protecting in lightning arrester inside.But there is a drawback in such measure, has promptly influenced the valve block radiating rate after lightning arrester moves.For large capacity metal oxide pressure-limiting device (MOV), radiating rate needs fast as far as possible, protects the method for insulator infeasible so install the preventing arc bucket additional in big capacity MOV.
Show by test in addition, also exist a kind of potential hazard: in little electric current pressure releasing process, MOV unexplosive insulator can occur and break, it is not to be the reason that is subjected to immense pressure, but the electric arc of MOV inside is fixed on the result of burning in the somewhere always in process of the test, the MOV insulator is because local overheating just can be broken by non-explosivity, and it also may work the mischief to the scene.
Summary of the invention
The purpose of this utility model provides a kind of large capacity metal oxide pressure-limiting device explosion-protection equipment, it is not changing on the basis of present MOV core as far as possible, arc burning generation of fracture phenomena to making MOV insulator local overheating in the time of effectively avoiding the MOV internal fault.
For achieving the above object, the utility model is taked following design: a kind of large capacity metal oxide pressure-limiting device explosion-protection equipment, it is located on the upper and lower electrode of large capacity metal oxide pressure-limiting device core body two groups by branch and leads the arc road and constitute.
The described arc road of leading is that the circle that plural arch starting rod surrounds is mutually led the arc road, or leads the arc road for plural straight or bending arc guide rod surrounds polygon mutually; Wherein an end is fixed on the electrode and electrical communication.Its other end place can be fixed on the electrode by collets.
The utility model has the advantages that:
1, the processing of this explosion-protection equipment is simple, installs additional conveniently, and reliable, effect is obvious, and does not influence the characteristic of the voltage limiters such as heat radiation of voltage limiter itself.
2, in the time of can guaranteeing no matter to be little electric current or the release of big electric current pressure all are the explosions of rupture pressure disc elder generation, and insulator is excellent, has eliminated the potential hazard of MOV insulator blast.
Description of drawings
Fig. 1-a is the utility model structural representation (main looking)
Fig. 1-b is the utility model structural representation (overlooks, do not show the bottom electrode of MOV core body)
Fig. 2-a is the utility model arc guide rod structural representation (main looking)
Fig. 2-b is the utility model arc guide rod structural representation (overlooking)
Fig. 3-a revolves arc principle schematic (electric current flows from top to bottom) for the utility model explosion-protection equipment
Fig. 3-b revolves arc principle schematic (electric current flows from the bottom up) for the utility model explosion-protection equipment
Embodiment
The utility model large capacity metal oxide pressure-limiting device explosion-protection equipment, it constitutes (promptly being divided into upper and lower two parts according to the installation site) by the arc road of leading that two components are located on the upper and lower electrode of large capacity metal oxide pressure-limiting device core body, and these two parts are laterally zygomorphic.
Fig. 1-a, Fig. 1-b have only provided the part that is installed in bottom electrode.Each of large capacity metal oxide pressure-limiting device explosion-protection equipment is led the circle (or polygon circle) that the arc road is made up of a plurality of (being generally 3～4) arc guide rod 1.It is good that arc guide rod is circular arc, and referring to Fig. 2-a, Fig. 2-b, an end directly links to each other with the electrode 3 of MOV core body by bolt, and an arc guide rod has only this point to link to each other with battery lead plate.In order to strengthen its mechanical strength, near arc guide rod other end place, by insulator 2 be bolted on the battery lead plate, this fixing point and battery lead plate insulate.For easy for installation, can be welded with brace 4,5 earlier in the tie point place on arc guide rod.
The operation principle of this device is as follows: after the voltage limiter core body is loaded onto explosion-protection equipment, if the flashover situation appears in core body, then no matter be electric current stream or electric current flows from the bottom up from top to bottom, it is a direction all the time that its arc road is subjected to electrodynamic action direction, shown in Fig. 3-a, Fig. 3-b.Move with regard to make electric arc in combustion process, be subjected to the electrodynamic action of same direction always like this, the arc guide rod of this device provides the path of moving to electric arc, when electric arc moves to the end of arc guide rod, can jump to and continue on the next arc guide rod to move up to arc extinction.So electric arc can not be fixed on certain burning when the voltage limiter fault, thereby avoided voltage limiter overcoat local overheating and the danger of exploding.
This explosion-protection equipment is applicable to big capacity voltage limiter (lightning arrester, MOV, MOA), it can be installed at the two ends of MOV core body, and purpose is when in voltage limiter inside electric arc being arranged, and makes electric arc at the inner rotary combustion of voltage limiter, insulator wall thermally equivalent is avoided local overheating and is exploded.
This explosion-protection equipment not only can be applicable to the production of big capacity voltage limiter, but also can be applicable to similar lightning arrester manufacturing.
Claims (5)
1, a kind of large capacity metal oxide pressure-limiting device explosion-protection equipment is characterized in that: it is located on the upper and lower electrode of large capacity metal oxide pressure-limiting device core body two groups by branch and leads the arc road and constitute.
2, large capacity metal oxide pressure-limiting device explosion-protection equipment according to claim 1 is characterized in that: the described arc road of leading is that the circle that plural arch starting rod surrounds is mutually led the arc road, and wherein an end is fixed on the electrode and electrical communication.
3, large capacity metal oxide pressure-limiting device explosion-protection equipment according to claim 1, it is characterized in that: the described arc road of leading is that plural circle or polygon straight or that the bending arc guide rod surrounds are mutually led the arc road, and wherein an end is fixed on the electrode and electrical communication.
4, according to claim 2 or 3 described large capacity metal oxide pressure-limiting device explosion-protection equipments, it is characterized in that: the other end place of described arc guide rod is fixed on the electrode by collets.
5, large capacity metal oxide pressure-limiting device explosion-protection equipment according to claim 1 is characterized in that: the described arc road of respectively leading is surrounded mutually by 3 to 4 arch starting rods and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520106566 CN2824252Y (en) | 2005-08-31 | 2005-08-31 | Explosion prevention device for high capacity metal oxide voltage limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520106566 CN2824252Y (en) | 2005-08-31 | 2005-08-31 | Explosion prevention device for high capacity metal oxide voltage limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2824252Y true CN2824252Y (en) | 2006-10-04 |
Family
ID=37033371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520106566 Expired - Lifetime CN2824252Y (en) | 2005-08-31 | 2005-08-31 | Explosion prevention device for high capacity metal oxide voltage limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2824252Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280792A (en) * | 2013-04-24 | 2013-09-04 | 国家电网公司 | Voltage limiter with porcelain housing for series compensation device |
-
2005
- 2005-08-31 CN CN 200520106566 patent/CN2824252Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280792A (en) * | 2013-04-24 | 2013-09-04 | 国家电网公司 | Voltage limiter with porcelain housing for series compensation device |
| CN103280792B (en) * | 2013-04-24 | 2016-09-21 | 国家电网公司 | A kind of series compensation device porcelain overcoat voltage limiter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER OWNER: BEIJING FUAN ELECTRIC EQUIPMENT CO.,LTD. Effective date: 20091120 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091120 Address after: Beijing City, Haidian District small business Qinghe Road No. 15 Chinese Electric Power Research Institute of the Ministry of science and technology, zip code: 100192 Patentee after: China Electric Power Research Institute Address before: No. 4, 1 Street, 3 floor, Beijing, Haidian District. Zip code: 100085 Patentee before: Beijing Fuan Electric Corp. |
|
| CX01 | Expiry of patent term |
Expiration termination date: 20150831 Granted publication date: 20061004 |
|
| EXPY | Termination of patent right or utility model |