CN202276143U - Bus type large-capacity overvoltage protection device - Google Patents
Bus type large-capacity overvoltage protection device Download PDFInfo
- Publication number
- CN202276143U CN202276143U CN2011203930593U CN201120393059U CN202276143U CN 202276143 U CN202276143 U CN 202276143U CN 2011203930593 U CN2011203930593 U CN 2011203930593U CN 201120393059 U CN201120393059 U CN 201120393059U CN 202276143 U CN202276143 U CN 202276143U
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- China
- Prior art keywords
- zinc oxide
- zno resistors
- overvoltage protection
- resistors device
- bus type
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Abstract
The utility model discloses a bus type large-capacity overvoltage protection device which consists of a zinc oxide overvoltage protector. Particularly, the zinc oxide overvoltage protector consists of a first zinc oxide resistor (2) and a second zinc oxide resistor (3) which are connected with each other in parallel; an angle alpha of a middle electric field area of the second zinc oxide resistor (3) is 10-120 percent of that of the first zinc oxide resistor (2), and the direct current reference voltage value of the second zinc oxide resistor (3) is 90-95 percent of that of the first zinc oxide resistor (2); the angle alpha of the middle electric field area of the second zinc oxide resistor (3) is 115 percent of that of the first zinc oxide resistor (2), and the direct current reference voltage value of the second zinc oxide resistor (3) is 93 percent of that of the first zinc oxide resistor (2); and the second zinc oxide resistor (3) consists of more than two zinc oxide resistors which are connected in parallel. The bus type large-capacity overvoltage protection device can be used for overvoltage protection of a power system.
Description
Technical field
The utility model relates to a kind of big capacity overvoltage protection, the big capacity overvoltage protection of especially a kind of bus type.
Background technology
In electric power system; People are in order to prevent that atmospheric over-voltage and switching overvoltage are to system and the wherein infringement of equipment; The overvoltage protection that cross-over connection is made up of the zinc oxide overvoltage protection device between bus and the ground of being everlasting is as just widely used in the present electric power system.Though these overvoltage protections can suppress various overvoltage effectively; Exist the shortcoming part also: the situation that long-time sustained overvoltage takes place in the electric power system is many; Like system resonance overvoltage etc.; It is long, not obvious to the infringement of equipment that these overvoltage generally show as the duration, but just relatively more serious to the infringement of overvoltage protection, improved the rate of failure of overvoltage protection widely.If the capacity of all overvoltage protections is all improved, with the construction cost that greatly improves electric power system; If only reduce the operating value of bus over voltage protection device, and improve its capacity, then can cause any overvoltage all can only absorb, finally cause the damage of bus over voltage protection device by the bus over voltage protection device.
The utility model content
The technical problem that the utility model will solve provides a kind of rational in infrastructure for overcoming shortcoming part of the prior art, the practical big capacity overvoltage protection of bus type.
For solving the technical problem of the utility model, the technical scheme that is adopted is: the big capacity overvoltage protection of bus type is made up of the zinc oxide overvoltage protection device, particularly,
Said zinc oxide overvoltage protection device is connected in parallel by the first ZnO resistors device and the second ZnO resistors device and constitutes; The α angle of the middle electric field region of the said second ZnO resistors device is that the DC reference voltage value of 110～120%, the second ZnO resistors device at electric field region α angle in the first ZnO resistors device is 90～95% of the first ZnO resistors device DC reference voltage value.
Further improvement as the big capacity overvoltage protection of bus type; The α angle of the middle electric field region of the described second ZnO resistors device is that the DC reference voltage value of 115%, the second ZnO resistors device at electric field region α angle in the first ZnO resistors device is 93% of the first ZnO resistors device DC reference voltage value; The described second ZnO resistors device is connected in parallel by the ZnO resistors device more than two and constitutes.
Beneficial effect with respect to prior art is; The applicant goes through various superpotential long-term substantive tests; The all smaller basically objective fact of overcurrent based on long-term overvoltage generation; Adopting the zinc oxide overvoltage protection device to be connected in parallel by the first ZnO resistors device and the second ZnO resistors device constitutes; And the α angle of the middle electric field region of the second ZnO resistors device be in the first ZnO resistors device electric field region α angle 110～120%; The DC reference voltage value of the second ZnO resistors device is 90～95% a technical scheme of the first ZnO resistors device DC reference voltage value, make the voltage-current characteristic of the first and second ZnO resistors devices produce intersection point, and the first and second ZnO resistors utensils has had different residual voltage values; Thereby make it in the face of various overvoltage the time, can press the size of the overcurrent of overvoltage generation, the action of classification automatically when promptly overcurrent is less than 90～110A, is absorbed by the second ZnO resistors device, otherwise, absorb by the first ZnO resistors device.The overvoltage protection of this structure; Can suppress various overvoltage fully effectively; Reduced the rate of failure of overvoltage protection again widely; Also do not need the capacity of all overvoltage protections is all improved, or on the basis that reduces bus over voltage protection device action value, improve its capacity, rational in infrastructure, practical characteristics is more arranged.
Further embodiment as beneficial effect; One be the α angle of the middle electric field region of the second ZnO resistors device be preferably electric field region α angle in the first ZnO resistors device 115%; The DC reference voltage value of the second ZnO resistors device is preferably 93% of the first ZnO resistors device DC reference voltage value, is beneficial to classification action automatically more accurately; Two is that the second ZnO resistors device preferably is connected in parallel by the ZnO resistors device more than two and constitutes, and not only is beneficial to its heat radiation, also is easy to reduce the cost of single ZnO resistors device.
Description of drawings
Be described in further detail below in conjunction with the optimal way of accompanying drawing the utility model.
Fig. 1 is a kind of basic structure sketch map of the utility model.
Embodiment
Referring to Fig. 1; Being constructed as follows of the big capacity overvoltage protection of bus type: being connected in parallel by the first ZnO resistors device 2 and the second ZnO resistors device 3 constitutes this device; The α angle of the middle electric field region of the second ZnO resistors device 3 wherein is 115 (can be 110～120) % at electric field region α angle in the first ZnO resistors device 2, and the DC reference voltage value of the second ZnO resistors device 3 is 93 (can be 90～95) % of the first ZnO resistors device, 2 DC reference voltage values.The second ZnO resistors device 3 is connected in parallel by two ZnO resistors devices and constitutes.
During use, only need the across of this device is got final product between the bus 1 of electric power system and ground.When atmosphere or switching overvoltage in system, occurring; At first absorb energy by the second lower ZnO resistors device 3 of DC reference voltage value; When the superpotential electric current that takes place during greater than 100A; Because the residual voltage value after the action of the second ZnO resistors device 3 is higher, can't absorb overcurrent that overvoltage produces in time and scabble or reduce superpotential peak value, residual superpotential peak value will force 2 conductings of the first ZnO resistors device; Add that the residual voltage value after 2 actions of the first ZnO resistors device is lower; Thereby make the most current directions first ZnO resistors device 2 in the overcurrent, and, guaranteed that the second ZnO resistors device 3 can not suffer damage because of the superpotential energy of long-term absorption by its absorption.
Obviously, those skilled in the art can be to the bus type of the utility model big capacity overvoltage protection carry out various changes and modification and do not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (3)
1. the big capacity overvoltage protection of bus type is made up of the zinc oxide overvoltage protection device, it is characterized in that:
Said zinc oxide overvoltage protection device is by the first ZnO resistors device (2) and the second ZnO resistors device (3) formation that is connected in parallel; The α angle of the middle electric field region of the said second ZnO resistors device (3) is that the DC reference voltage value of 110～120%, the second ZnO resistors device (3) at electric field region α angle in the first ZnO resistors device (2) is 90～95% of first ZnO resistors device (2) the DC reference voltage value.
2. the big capacity overvoltage protection of bus type according to claim 1; The α angle that it is characterized in that the middle electric field region of the second ZnO resistors device (3) is that the DC reference voltage value of 115%, the second ZnO resistors device (3) at electric field region α angle in the first ZnO resistors device (2) is 93% of first ZnO resistors device (2) the DC reference voltage value.
3. the big capacity overvoltage protection of bus type according to claim 2 is characterized in that the second ZnO resistors device (3) is connected in parallel by the ZnO resistors device more than two to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203930593U CN202276143U (en) | 2011-10-14 | 2011-10-14 | Bus type large-capacity overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203930593U CN202276143U (en) | 2011-10-14 | 2011-10-14 | Bus type large-capacity overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202276143U true CN202276143U (en) | 2012-06-13 |
Family
ID=46196480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203930593U Expired - Fee Related CN202276143U (en) | 2011-10-14 | 2011-10-14 | Bus type large-capacity overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202276143U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050952A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Bus type large-capacity overvoltage protection device |
-
2011
- 2011-10-14 CN CN2011203930593U patent/CN202276143U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050952A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Bus type large-capacity overvoltage protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120613 Termination date: 20151014 |
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| EXPY | Termination of patent right or utility model |