CN85202138U - Parallel zinc oxide over-voltage limiter for vacuum switch - Google Patents
Parallel zinc oxide over-voltage limiter for vacuum switch Download PDFInfo
- Publication number
- CN85202138U CN85202138U CN 85202138 CN85202138U CN85202138U CN 85202138 U CN85202138 U CN 85202138U CN 85202138 CN85202138 CN 85202138 CN 85202138 U CN85202138 U CN 85202138U CN 85202138 U CN85202138 U CN 85202138U
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- vacuum switch
- zinc
- utility
- model
- voltage
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Abstract
The utility model belongs to the field of engineering technology of electric appliances and is used for limiting a vacuum switch which works to produce an over voltage. When a vacuum switch is used for switching on or switching off inductive load, such as an electric motor, a transformer, etc., the vacuum switch can produce an over voltage with a high cutoff. The limiter of the utility model is respectively connected in parallel with a set of zinc-oxide nonlinear resistors on the three phase fractures of the vacuum switch, and the over voltage is effectively limited. Therefore, the insulation of the load, such as an electric motor and a transformer, is protected and is not damaged. Simultaneously because the zinc-oxide nonlinear resistor is directly connected with the fracture, when the limiter of the utility model normally runs, the zinc-oxide is short-circuited and does not bear any electric voltage. The ageing of the zinc-oxide nonlinear resistor can be prevented. The service life is extended. The utility model can be used for a power supply system and a power distribution system with less than 10 kv.
Description
The invention belongs to the electro-engineering technical field.The overvoltage that produces when being used to limit the vacuum switch action.
Since vacuum switch comes out because its unique life-span height, noiseless, no explosion hazard, outstanding advantages such as operation maintenance is simple, at home and abroad each industrial circle has obtained using widely, and the trend that progressively replaces less oil and air circuit is arranged.But when cutting off inductive load,, the phenomenon of damming before the power current natural zero-crossing, promptly occurs, thereby produce very high overvoltage because the arc extinction performance of vacuum switch is strong.Load-the motor that the serious threat insulation margin is limited and the safe operation of transformer.Mainly take two kinds of approach in order to address this problem abroad, a kind of is material and the structure of improving switch contact.Another kind is adding between wiring on the external circuit or line overvoltage protection over the ground, as lightning arrester or capacitance-resistance surge absorber.But these ways or have certain technical problem, perhaps volume bulkiness, and cost an arm and a leg.For example existing contradictory elements between contact life-span and the over-voltage in the improvement of contact material.Between the line of external circuit and line add over the ground lightning arrester then since normal lightning arrester in service to bear power-frequency voltage and other overvoltage for a long time and cause other fault or the like easily.
We spy proposes a kind of novel vacuum switch overvoltage limiter for this reason.The present invention adopts the main element of high energy high pressure oxidation zinc nonlinear resistance as overvoltage protection; in the connection of external circuit with different abroad; be the fracture two ends that znr are directly parallel in vacuum switch; concrete tie lines is seen figure, and its operation principle is as follows:
Vacuum switch is in closure state during normal power supply, and znr device (1) is not born any voltage by vacuum switch (2) short circuit.Do not have any leakage current by (1) yet, just can not cause the aging of znr certainly yet.Vacuum switch tripping operation when cut-offfing action; when power current during near natural zero-crossing point electric current be compelled to block; when the induction overvoltage that is produced when inductive load (4) reaches the breakover voltage of znr; the instantaneous conducting of znr; because the non-linear voltage-current characteristic of znr has near constant voltage in sizable current range, thereby makes load (4) be able to protected.Vacuum switch cut-off fully the back isolation switch (8) thereupon deenergization can excise fully.The present invention can be widely used in the power supply-distribution system below 10 kilovolts.
Claims (1)
1. vacuum switch overvoltage Limiting device is characterized in that using one to be connected in parallel on switch ends.With zinc oxide is the nonlinear resistance of stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202138 CN85202138U (en) | 1985-04-01 | 1985-04-01 | Parallel zinc oxide over-voltage limiter for vacuum switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202138 CN85202138U (en) | 1985-04-01 | 1985-04-01 | Parallel zinc oxide over-voltage limiter for vacuum switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85202138U true CN85202138U (en) | 1986-03-26 |
Family
ID=4798020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85202138 Ceased CN85202138U (en) | 1985-04-01 | 1985-04-01 | Parallel zinc oxide over-voltage limiter for vacuum switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85202138U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728140B (en) * | 2008-10-27 | 2012-04-18 | 国网电力科学研究院 | High voltage or ultra-high voltage high-current circuit breaker |
| CN103578843A (en) * | 2013-11-08 | 2014-02-12 | 西安盟创电器有限公司 | Non-reignition disconnector |
| CN105356436A (en) * | 2014-08-18 | 2016-02-24 | 上海舒盈电气有限公司 | Multi-functional integrated circuit protection device |
-
1985
- 1985-04-01 CN CN 85202138 patent/CN85202138U/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728140B (en) * | 2008-10-27 | 2012-04-18 | 国网电力科学研究院 | High voltage or ultra-high voltage high-current circuit breaker |
| CN103578843A (en) * | 2013-11-08 | 2014-02-12 | 西安盟创电器有限公司 | Non-reignition disconnector |
| CN105356436A (en) * | 2014-08-18 | 2016-02-24 | 上海舒盈电气有限公司 | Multi-functional integrated circuit protection device |
| CN105356436B (en) * | 2014-08-18 | 2019-06-28 | 上海舒盈电气有限公司 | Multifunctional comprehensive circuit protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right | ||
| CE01 | Termination of patent right |