CN213753986U - Overvoltage protector - Google Patents
Overvoltage protector Download PDFInfo
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- CN213753986U CN213753986U CN202021954294.9U CN202021954294U CN213753986U CN 213753986 U CN213753986 U CN 213753986U CN 202021954294 U CN202021954294 U CN 202021954294U CN 213753986 U CN213753986 U CN 213753986U
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- resistor
- piezo
- compensation
- overvoltage
- protection
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- 230000001012 protector Effects 0.000 title claims abstract description 38
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 7
- 230000001419 dependent effect Effects 0.000 description 7
- 239000006004 Quartz sand Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229940057995 liquid paraffin Drugs 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
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Abstract
The utility model relates to an overvoltage protector, including insulating casing (7) and encapsulate main protection piezo-resistor (1), first compensation piezo-resistor (2), second compensation piezo-resistor (3), first PTC thermal protector (4), second PTC thermal protector (5) and fuse (6) in insulating casing (7), binding post is connected to the one end of main protection piezo-resistor (1), and the other end is established ties in proper order with first compensation piezo-resistor (2), second compensation piezo-resistor (3) are established ties the back with fuse (6), are connected with binding post, first PTC thermal protector (4) second PTC thermal protector (5) respectively with first compensation piezo-resistor (2) second compensation piezo-resistor (3) are parallelly connected. Compared with the prior art, the utility model has the advantages of incomplete pressure is low, can protect power frequency overvoltage.
Description
Technical Field
The utility model relates to a power protection equipment especially relates to an overvoltage protection device.
Background
The zero-phase open circuit of a single-phase user causes overvoltage to damage electric appliances, and the zero-phase open circuit occurs in each power supply station, so that the zero-phase open circuit is more common in summer load peaks. The zero-phase open circuit damaged electrical appliances often cause high-value compensation to the power department and also easily cause adverse social effects of power grid enterprises. The three-phase four-wire system transformer adopts direct grounding, the zero line and the ground have the same potential, under the general condition, the zero line is not electrified, and in the three-phase four-wire system power supply line, because the zero line (neutral line) is arranged, the voltage of each phase of the load is always equal and is about 220V no matter whether the three-phase load is balanced, so that the household appliance is safe and reliable to work under the normal voltage. However, in some cases, dangerous voltages appear on the zero line, causing serious economic losses to the user of burning out the appliance.
Therefore, the most economic means is to popularly install the overvoltage protection device, and the overvoltage protection device can not only solve the overvoltage that zero phase opens a way and lead to, can also absorb the thunder and lightning invasion ripples, and is significant to the reliability and the security that promote rural power grids. Meanwhile, the method has great significance for reducing high compensation of the user electrical equipment damaged by zero line open circuit overvoltage in the power supply department.
However, the overvoltage protector in the prior art has three major disadvantages, namely, the residual voltage is high, and the overvoltage with a low amplitude of zero-phase open circuit cannot be protected, because the zinc oxide resistor disc is easy to fail if the operating voltage of the zinc oxide protection device is high, and the protection characteristic is poor due to the large residual voltage; and secondly, power frequency overvoltage cannot be protected, and because the overvoltage energy absorbed by the oxidation type voltage-sensitive device is extremely limited, the overvoltage can not bear power frequency overvoltage with longer duration, so that rural power grid low-voltage users cannot well select an overvoltage protector to overcome the problem of zero-phase open-circuit protection. Third, most of the overvoltage protection circuit breakers in the prior art rely on a large number of electronic components, the reliability and the service life are general, and the overvoltage protection circuit breaker needs to use an electrolytic capacitor and a transistor component, the two components have poor overvoltage tolerance capability, and the electrolytic capacitor has a service life limitation, so that the overvoltage protection circuit breaker has low protection reliability and short service life.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to provide an overvoltage protection device with low residual voltage, high protection reliability and long service life, which can protect power frequency overvoltage and overcome the defects of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides an overvoltage protector, includes insulating casing and encapsulates main protection piezo-resistor, first compensation piezo-resistor, second compensation piezo-resistor, first PTC thermal protector, the hot protector of second PTC and fuse in insulating casing, binding post is connected to main protection piezo-resistor's one end, and the other end is established ties in proper order with first compensation piezo-resistor, second compensation piezo-resistor is connected with binding post after establishing ties with the fuse, first PTC thermal protector second PTC thermal protector respectively with first compensation piezo-resistor second compensation piezo-resistor is parallelly connected.
Further, the action voltage of the main protection voltage dependent resistor is 1.1 times of the peak value of the rated power supply voltage.
Further, the action voltage of the first compensation voltage dependent resistor and the second compensation voltage dependent resistor is 0.1 time of the peak value of the rated power supply voltage.
Furthermore, quartz sand and liquid paraffin are poured into the insulating shell.
The utility model provides an overvoltage protector compares in prior art, has following beneficial effect at least:
1. the residual voltage of the overvoltage protector is greatly reduced: the utility model discloses an ingenious compensation piezo-resistor that sets up, can make the piezo-resistor's that main protection was used the rate of charge set up higher, leakage current increases after the piezo-resistor of main protection is ageing, make parallelly connected and compensate piezo-resistor's PTC thermal protection ware disconnection, compensation piezo-resistor inserts, raise action voltage, can be very low with whole overvoltage protection device's residual pressure setting, thereby promote the overvoltage protection effect by a wide margin, set for 1.1 times rated voltage's overvoltage just can be effectively absorbed, it is that prior art is difficult to accomplish.
2. Power frequency overvoltage protection is realized: the utility model discloses a encapsulate whole circuit element in insulating casing, pour into the extremely strong quartz sand of arc extinguishing fire behavior in insulating casing to and the liquid paraffin that specific heat capacity is very big, after the protection device generates heat because of bearing the overvoltage energy, its energy of generating heat will be absorbed by the paraffin that fills, simultaneously under the protection of quartz sand, make the ability that the piezo-resistor absorbed the overvoltage rise with the order of magnitude, realized the ability of absorbing the power frequency overvoltage.
3. An extremely high level of protection reliability is achieved: the overvoltage protection circuit breaker in the prior art depends on a large number of electronic elements, the reliability is general with the service life, the utility model discloses only need piezo-resistor can realize the whole protective function of prior art, the piezo-resistor is regarded as the mature passive device that the reliability is extremely high, compare with the overvoltage protection device that adopts a large amount of active detection circuit designs, the cost is reduced when the reliability improves by a wide margin; compare in the overvoltage protection circuit breaker that needs used electrolytic capacitor and transistor element, the utility model discloses only need piezo-resistor can realize whole protect function, it is stronger to tolerate the overvoltage ability, and has avoided the life-span restriction of component itself, has apparent high protection reliability and high life's advantage.
Drawings
Fig. 1 is a schematic circuit diagram of an overvoltage protector according to the present invention in an embodiment;
the reference numbers in the figures indicate:
1. the main protection piezoresistor, 2, the first compensation piezoresistor, 3, the second compensation piezoresistor, 4, the first PTC thermal protector, 5, the second PTC thermal protector, 6, the fuse, 7, insulating housing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the utility model relates to an overvoltage protector, including main protection piezo-resistor 1, first compensation piezo-resistor 2, second compensation piezo-resistor 3, first PTC thermal protector 4, second PTC thermal protector 5, fuse 6 and insulating casing 7. The utility model discloses a main protection piezo-resistor 1, first compensation piezo-resistor 2, second compensation piezo-resistor 3, first PTC thermal protector 4, second PTC thermal protector 5 and fuse 6 all encapsulate in insulating casing 7.
One end of the main protection piezoresistor 1 is connected with the wiring terminal, and the other end of the main protection piezoresistor 1 is sequentially connected with the first compensation piezoresistor 2 and the second compensation piezoresistor 3 in series, and then connected with the wiring terminal after being connected with the fuse 6 in series. The first PTC thermal protector 4 and the second PTC thermal protector 5 are respectively connected with the first compensation piezoresistor 2 and the second compensation piezoresistor 3 in parallel and used for overheat protection of the compensation piezoresistor. The action voltage of the main protection voltage dependent resistor 1 is 1.1 times of the peak value of the rated power supply voltage, and the action voltages of the first compensation voltage dependent resistor 2 and the second compensation voltage dependent resistor 3 are 0.1 times of the peak value of the rated power supply voltage.
As preferred scheme, the utility model discloses a fill quartz sand and liquid paraffin among the insulating casing 7 for realize each piezo-resistor self heat-resisting, heat dissipation, heat accumulation ability's improvement by a wide margin, make it possess the ability of absorbing millisecond overvoltage energy, and then make after the overvoltage takes place until dozens to hundreds of milliseconds of tripping operation in, all have incessant overvoltage absorption protection, realized the seamless overvoltage protection that prior art can't realize. The utility model discloses a encapsulate whole circuit element in insulating casing 7, pour the extremely strong quartz sand of arc extinguishing fire behavior in insulating casing 7 to and the very big liquid paraffin of specific heat capacity, after the protection device generates heat because of bearing the overvoltage energy like this, its energy of generating heat will be absorbed by the paraffin that fills, simultaneously under the protection of quartz sand, make each piezo-resistor absorb the ability of overvoltage and rise with the order of magnitude, realized absorbing the ability of power frequency overvoltage.
The utility model provides an overvoltage protector, fall into main protection with piezo-resistor, two kinds of functions are used in the compensation, establish ties on the circuit, main protection piezo-resistor 1's that main protection was used the rate of charge is very high, can realize low residual voltage protection, rethread ingenious sets up first compensation piezo-resistor 2, second compensation piezo-resistor 3, after main protection piezo-resistor 1 of main protection is ageing, leakage current increases, at this moment rely on parallelly connected and each compensation piezo-resistor 2, 3 PTC thermal protection ware 4, 5 disconnection, make compensation piezo-resistor 2, 3 insert, raise the action voltage, this is very low that just makes whole overvoltage protector's residual voltage can set up, thereby promote the overvoltage protection effect by a wide margin. If the action voltage of the main protection voltage dependent resistor 1 of the main protection is set to be 1.1 times of the system operation voltage, the overvoltage of the circuit, which is 1.1 times of the rated voltage, can be effectively absorbed, and the overvoltage protection of extremely low residual voltage is realized.
The utility model provides an overvoltage protector has realized the protection reliability of very high level, through ingenious compensation piezo-resistor that sets up, can make the piezo-resistor's that main protection used the rate of charging set up higher, and then very low with whole overvoltage protector's residual voltage setting to promote the overvoltage protection effect by a wide margin. Compare in prior art and rely on a large amount of electronic component's overvoltage protection circuit breaker, the utility model discloses an overvoltage protector only needs piezo-resistor to realize the whole protect function of prior art, and piezo-resistor compares with the overvoltage protection device who adopts a large amount of active detection circuit design as the extremely high ripe passive device of reliability, and the promotion of its reliability can not be in the same day, and life is higher.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The utility model provides an overvoltage protector, its characterized in that, includes insulating casing (7) and encapsulates main protection piezo-resistor (1), first compensation piezo-resistor (2), second compensation piezo-resistor (3), first PTC thermal protector (4), second PTC thermal protector (5) and fuse (6) in insulating casing (7), binding post is connected to the one end of main protection piezo-resistor (1), and the other end is established ties in proper order with first compensation piezo-resistor (2), second compensation piezo-resistor (3) are established ties the back with fuse (6), are connected with binding post, first PTC thermal protector (4) second PTC thermal protector (5) respectively with first compensation piezo-resistor (2) second compensation piezo-resistor (3) are parallelly connected.
2. Overvoltage protector according to claim 1, characterized in that the operating voltage of the main protection varistor (1) is 1.1 times the peak value of the rated supply voltage.
3. Overvoltage protector according to claim 1, characterized in that the first (2) and second (3) compensation piezoresistors have an operating voltage of 0.1 times the peak value of the nominal supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021954294.9U CN213753986U (en) | 2020-09-09 | 2020-09-09 | Overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021954294.9U CN213753986U (en) | 2020-09-09 | 2020-09-09 | Overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213753986U true CN213753986U (en) | 2021-07-20 |
Family
ID=76842271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021954294.9U Active CN213753986U (en) | 2020-09-09 | 2020-09-09 | Overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213753986U (en) |
-
2020
- 2020-09-09 CN CN202021954294.9U patent/CN213753986U/en active Active
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