CN204144934U - Slicing formula voltage protector - Google Patents
Slicing formula voltage protector Download PDFInfo
- Publication number
- CN204144934U CN204144934U CN201420338247.XU CN201420338247U CN204144934U CN 204144934 U CN204144934 U CN 204144934U CN 201420338247 U CN201420338247 U CN 201420338247U CN 204144934 U CN204144934 U CN 204144934U
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- point
- voltage
- resistor
- measuring instrument
- supply voltage
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- Expired - Fee Related
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- 230000001012 protector Effects 0.000 title claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 244000141353 Prunus domestica Species 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Abstract
Slicing formula voltage protector, belongs to electrotechnics technical field, when exceeding set point by capacitance resistance ware Za from the value that step-down high-voltage fence U obtains the low-tension supply voltage U x of measuring instrument N, the switching device in protector can conducting automatically, the two ends of Ux are connected on two ac input ends of rectifier bridge Do respectively, the positive output termination P1 point of Do, the negative output termination P3 point of Do, the two ends of varistor Rv1 connect P1 and P3 point respectively, the two ends of resistor R1 are connected on P1 and P2 point respectively, the two ends being connected into variable-resistance potentiometer Rp1 are connected on P2 and P3 point respectively, the negative pole of voltage stabilizing didoe D1 connects P2 point, the G that the positive pole of D1 is connected on MOS triode V1 extremely goes up, one end of resistor R2 is connected on P3 point, the G that the other end is connected on V1 extremely goes up, one end of resistor R3 is connected on P1 point, the D that the other end is connected on V1 extremely goes up, the S pole of V1 connects P3 point, adjustment potentiometer Rp1, when making the supply voltage Ux >=set point of measuring instrument N, the automatic conducting of V1.
Description
Technical field
The utility model belongs to electrotechnics technical field.
Background technology
In electric power system; some measuring instrument N, its supply voltage Ux are obtained from step-down high pressure netting twine U by capacitance resistance ware Za, generally get Ux≤300V; for the measuring instrument N determined, high-voltage fence U; the value of Za is also determined, therefore, when surge sudden change occurs high-voltage fence U; Ux value is often made to be greater than the safety value of setting; cause the damage of measuring instrument system, be therefore badly in need of a kind of voltage protection, to ensure the normal work of measuring instrument.
Summary of the invention
Technical problem to be solved in the utility model is: provide a kind of slicing formula voltage protector; for measuring instrument N; its supply voltage Ux is obtained from step-down high pressure netting twine U by capacitance resistance ware Za; when the value of Ux exceeds set point; switching device MOS triode energy conducting automatically in this voltage protector; ream the part higher than set point in supply voltage Ux, reach the object of monitoring for protection instrument.If the equiva lent impedance of measuring instrument N power supply is Zx; from electrotechnics principle; Ux=UZx/ (Za+Zx) under normal circumstances; when there is surge sudden change in high-voltage fence U; the automatic conducting of switching device MOS triode in slicing formula voltage protector; this is just equivalent to a small resistor in parallel on Zx, and Ux is remained unchanged.
The utility model adopts following technical scheme: the power supply by capacitance resistance ware Za from the voltage U x that step-down high pressure netting twine U obtains being the measuring instrument N that need protect, be connected on respectively at the two ends of Ux on two ac input ends of rectifier bridge Do, the positive output termination P1 point of rectifier bridge Do, the negative output termination P3 point of rectifier bridge Do, the two ends of varistor Rv1 connect P1 and P3 point respectively, the two ends of resistor R1 are connected on P1 and P2 point respectively, the two ends being connected into variable-resistance potentiometer Rp1 are connected on P2 and P3 point respectively, the negative pole of voltage stabilizing didoe D1 connects P2 point, the G that the positive pole of D1 is connected on MOS triode V1 extremely goes up, one end of resistor R2 is connected on P3 point, the G that the other end is connected on V1 extremely goes up, one end of resistor R3 is connected on P1 point, the D that the other end is connected on V1 extremely goes up, the S pole of MOS triode V1 connects P3 point, adjustment potentiometer Rp1, when making the supply voltage Ux >=set point of measuring instrument N, the automatic conducting of switching device MOS triode V1, to exceed the part of set point in the supply voltage Ux that prunes, reaches the object of the supply voltage Ux of monitoring for protection instrument N.
Owing to have employed such scheme; make required protection by the supply voltage Ux of capacitance resistance ware Za from the measuring instrument N of step-down acquisition high-voltage fence U; remain at the scope being less than or equal to set point; to ensure equipment safety operation; because the MOS triode switch time is less than 10 μ S; the voltage protector that the utility model is provided has extremely strong defencive function to electrical network surge and thunder and lightning interference, and linked network actual measurement shows reliable for effect.
Accompanying drawing illustrates:
Fig. 1 is electrical schematic diagram of the present utility model.Wherein U is high-tension electricity netting twine, and Za is the capacitance resistance ware for step-down, and N is protected measuring instrument, and Ux is the power supply of N, and remainder is the slicing formula voltage protector that the utility model provides.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described further.Select the relating to parameters of components and parts and protected supply voltage Ux; with Ux≤300V; maximum impact electric current≤30A is example; rectifier bridge Do should select withstand voltage 400V, and maximum operating currenbt is the device of 50A, and varistor Rv1 selects model to be MYD-05K471; the voltage stabilizing value of voltage stabilizing didoe D1 is 5V; the model of MOS triode V1 is 2SK1020, and resistor R3 electric furnace heating wire is made, and parameter is 10 Ω 1kW.Resistor R1 gets 1W100k Ω, and potentiometer Rp1 gets 1W10k Ω.
Claims (1)
1. a kind of slicing formula voltage protector is provided, when the value of the supply voltage Ux of measuring instrument N exceeds set point, the automatic conducting of switching device in this voltage protector, to ream the part higher than set point in Ux, reach the object of monitoring for protection instrument, it is characterized in that: the power supply by capacitance resistance ware Za from the voltage U x that step-down high pressure netting twine U obtains being the measuring instrument N that need protect, be connected on respectively at the two ends of Ux on two ac input ends of rectifier bridge Do, the positive output termination P1 point of rectifier bridge Do, the negative output termination P3 point of rectifier bridge Do, the two ends of varistor Rv1 connect P1 and P3 point respectively, the two ends of resistor R1 are connected on P1 and P2 point respectively, the two ends being connected into variable-resistance potentiometer Rp1 are connected on P2 and P3 point respectively, the negative pole of voltage stabilizing didoe D1 connects P2 point, the G that the positive pole of D1 is connected on MOS triode V1 extremely goes up, one end of resistor R2 is connected on P3 point, the G that the other end is connected on V1 extremely goes up, one end of resistor R3 is connected on P1 point, the D that the other end is connected on V1 extremely goes up, the S pole of MOS triode V1 connects P3 point, adjustment potentiometer Rp1, when making the supply voltage Ux >=set point of measuring instrument N, the automatic conducting of switching device MOS triode V1, to exceed the part of set point in the supply voltage Ux that prunes, reaches the object of the supply voltage Ux of monitoring for protection instrument N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420338247.XU CN204144934U (en) | 2014-06-24 | 2014-06-24 | Slicing formula voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420338247.XU CN204144934U (en) | 2014-06-24 | 2014-06-24 | Slicing formula voltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204144934U true CN204144934U (en) | 2015-02-04 |
Family
ID=52421599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420338247.XU Expired - Fee Related CN204144934U (en) | 2014-06-24 | 2014-06-24 | Slicing formula voltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204144934U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
| CN111049095A (en) * | 2019-12-13 | 2020-04-21 | 国家电网有限公司 | Cross-region integrated relay protection system |
-
2014
- 2014-06-24 CN CN201420338247.XU patent/CN204144934U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
| CN111049095A (en) * | 2019-12-13 | 2020-04-21 | 国家电网有限公司 | Cross-region integrated relay protection system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20210624 |