CN2515854Y - Overvoltage protector - Google Patents
Overvoltage protector Download PDFInfo
- Publication number
- CN2515854Y CN2515854Y CN 01229764 CN01229764U CN2515854Y CN 2515854 Y CN2515854 Y CN 2515854Y CN 01229764 CN01229764 CN 01229764 CN 01229764 U CN01229764 U CN 01229764U CN 2515854 Y CN2515854 Y CN 2515854Y
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- Prior art keywords
- capacitor
- overvoltage
- resistive element
- utility
- overvoltage protection
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- 230000001012 protector Effects 0.000 title description 3
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of low-voltage electric appliances, comprising a plurality of non-linear resistance elements R<Z>, a plurality of parallel capacitances C and a plurality of serial inductances L. The utility model which has the advantages of fast operating and stable working can be widely applied for overvoltage protection to low-voltage electric appliances.
Description
Technical field
The utility model belongs to the low voltage electrical equipment technical field, and is particularly a kind of as the protective device that suppresses and absorb temporary overvoltage.
Background technology
Overvoltage protection device ensures that to the infringement of low voltage electrical equipment (as: low-voltage equipment in computer, low-voltage electrical apparatus, telephone exchange, the electrion etc.) elimination lightning overvoltage, internal overvoltage the low voltage electrical equipment safe operation plays a very good protection.
In the protector that can see on the market, be to utilize nonlinear resistive element to suppress superpotential mostly now, this element function instability is about the microsecond level operate time that has, and can reach nanosecond the operate time that has.Because operate time, instability may also very high overvoltage can occur on nonlinear resistance, can not well protect electric equipment.Its wiring is shown in Fig. 1 (a), and nonlinear resistive element also is connected on the protected circuit, and the voltage-current characteristic of this element is shown in Fig. 1 (b), and under normal working voltage (as 220V), its voltage is U
1, by the electric current I of element
1, when the overvoltage that surpasses operating voltage arrived circuit, the electric current by element was I
2,,, therefore can play inhibitory action to overvoltage so very high voltage can not occur at the two ends of nonlinear resistive element because the U-I curve of this element is a saturation curve.
Summary of the invention
The purpose of this utility model is for overcoming the weak point of prior art, propose a kind of overvoltage protection device, and it is fast to have an operate time, and the advantage of working stability, can be widely used in the overvoltage protection to low voltage electrical equipment.
The utility model has designed a kind of overvoltage protection device, comprises a plurality of nonlinear resistive element R
Z, it is characterized in that, be connected with the first nonlinear resistive element R at power end
Z, this first nonlinear resistive element R
ZTwo ends connect the first capacitor C group of forming by the capacitor C of two series connection, the mid point of two capacitor C of this first capacitor C group links to each other with ground wire, at second, third nonlinear resistance of the two ends of this each capacitor C parallel connection R
Z, the said first nonlinear resistive element R
ZThe two ends a pair of inductance L of also connecting respectively, the mid point of these two pairs of inductance L connects the second capacitor C group of being made up of the capacitor C of two series connection, the mid point of this second capacitor C group is connected on the earth connection.
The said inductance L of the utility model can be tens μ H to tens mH, and said capacitor C can be hundreds of PF to hundreds of μ F, said nonlinear resistance R
Z, can be 1A to 10kA.
The utility model also can comprise the protective tube R that is connected in power end
DWith indicator light D.
Principle of the present utility model:
Because the impedance of electric capacity is very big under low frequency, the impedance of inductance is very little, so power current can be smoothly by arriving load.Under high frequency situations (when overvoltage is arranged), the impedance of electric capacity is very little, and the impedance of inductance is very big; so overvoltage can be suppressed in this protector well; served as time of voltage wave when very little (as nanosecond), the better effects if of filtering then, thereby can better protect equipment.
Characteristics of the present utility model and application:
The utility model can filter out the overvoltage ripple.From the overvoltage ripple is carried out theory analysis as can be known, so-called overvoltage comprises: 1, lightning overvoltage, 2, internal overvoltage.These superpotential paces of change are very fast, are a kind of single pulse voltage waves as the thunder and lightning overvoltage, the about 1-2 microsecond of transformation period, and being equivalent to frequency is the hundreds of KHz.The circuit of the utility model design can pass through operating frequency for 50 hertz to arrive protected device smoothly, and the overvoltage ripple is then suppressed by circuit of the present utility model.
Overvoltage protection device of the present utility model can be widely used on the low voltage electrical equipment; only lift a few example explanations below; 1, overvoltage protection device is used for the low-voltage equipment of high-pressure discharging device, as the protection of control cubicle low-tension supply, the protection of measuring instrument, the protection of electric rotating machine.
2, computer, oscillographic protection.When the thunder discharge phenomenon takes place, through the break situation of oscilloscope, computer of regular meeting.After adding overvoltage protection device, can well protect oscilloscope, computer.
Description of drawings
The overvoltage protection schematic diagram of the existing employing nonlinear resistance of Fig. 1,
Wherein (a) is the circuit connection diagram, (b) is the circuit characteristic schematic diagram.
Fig. 2 is the utility model circuit connection diagram,
Wherein (a) is the circuit connection diagram, (b) is the circuit characteristic schematic diagram.
Embodiment
A kind of overvoltage protection device embodiment of the utility model design as shown in Figure 2, by 4 shunt capacitance C, 4 series inductance L, 3 nonlinear resistive element R
Z, two protective tube RD and indicator light D that are connected in power end constitute, shown in Fig. 2 (a), the parameter of its each element is: shunt capacitance C is that 1-2 μ F, series inductance L are 0.1-0.2mH, nonlinear resistive element R
ZBe 10-20kA.
The frequency protection characteristic of present embodiment is shown in Fig. 2 (b), and when frequency is high more, overvoltage is easy more to be absorbed.
Claims (3)
1, a kind of overvoltage protection device comprises a plurality of nonlinear resistive element R
Z, it is characterized in that, be connected with the first nonlinear resistive element R at power end
Z, this first nonlinear resistive element R
ZTwo ends connect the first capacitor C group of forming by the capacitor C of two series connection, the mid point of two capacitor C of this first capacitor C group links to each other with ground wire, at second, third nonlinear resistance of the two ends of this each capacitor C parallel connection R
Z, the said first nonlinear resistive element R
ZThe two ends a pair of inductance L of also connecting respectively, the mid point of these two pairs of inductance L connects the second capacitor C group of being made up of the capacitor C of two series connection, the mid point of this second capacitor C group is connected on the earth connection.
2, overvoltage protection device as claimed in claim 1 is characterized in that, said inductance L is tens μ H to tens mH, said capacitor C be hundreds of PF to hundreds of μ F, said nonlinear resistance R
ZFor 1A to 10kA.
3, overvoltage protection device as claimed in claim 1 is characterized in that, also comprises the protective tube RD and the indicator light D that are connected in power end.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 01229764 CN2515854Y (en) | 2001-07-06 | 2001-07-06 | Overvoltage protector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 01229764 CN2515854Y (en) | 2001-07-06 | 2001-07-06 | Overvoltage protector |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2515854Y true CN2515854Y (en) | 2002-10-09 |
Family
ID=33644550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 01229764 Expired - Fee Related CN2515854Y (en) | 2001-07-06 | 2001-07-06 | Overvoltage protector |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2515854Y (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105576391A (en) * | 2015-08-07 | 2016-05-11 | 仲杏英 | Lightning arrester grounding device |
CN106655143A (en) * | 2016-11-16 | 2017-05-10 | 合肥普望电子有限责任公司 | Three-phase combined overvoltage protector |
CN109888760B (en) * | 2019-03-12 | 2023-10-20 | 北京山图有源防雷科技有限公司 | Safety protection device for electrical equipment |
-
2001
- 2001-07-06 CN CN 01229764 patent/CN2515854Y/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105576391A (en) * | 2015-08-07 | 2016-05-11 | 仲杏英 | Lightning arrester grounding device |
CN105576391B (en) * | 2015-08-07 | 2018-06-05 | 潘云 | Earthing of lightening arrester |
CN106655143A (en) * | 2016-11-16 | 2017-05-10 | 合肥普望电子有限责任公司 | Three-phase combined overvoltage protector |
CN109888760B (en) * | 2019-03-12 | 2023-10-20 | 北京山图有源防雷科技有限公司 | Safety protection device for electrical equipment |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |