CN207994621U - A kind of surge protection circuit and device for earth resistance tester - Google Patents
A kind of surge protection circuit and device for earth resistance tester Download PDFInfo
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- CN207994621U CN207994621U CN201820543608.2U CN201820543608U CN207994621U CN 207994621 U CN207994621 U CN 207994621U CN 201820543608 U CN201820543608 U CN 201820543608U CN 207994621 U CN207994621 U CN 207994621U
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- clamper module
- interpole
- clamper
- module
- protection circuit
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Abstract
The utility model belongs to technical field of electronic equipment, provides a kind of surge protection circuit and device for earth resistance tester, which includes：First clamper module, second clamper module, third clamper module, by the way that the first clamper module is connected between the earthing pole of the earth resistance tester and voltage interpole, the second clamper module is connected between the voltage interpole of the earth resistance tester and electric current interpole, the third clamper module is connected between the earthing pole of the earth resistance tester and electric current interpole, by the potential difference clamper between three electrodes of earth resistance tester in predeterminable area, it solves at present when being tested ground resistance using three electrode method, since interpole is connect with the earth, when there is a situation where lightning stroke or surge, three extremely in appoint the two poles of the earth between will produce potential difference, will break when potential difference reaches a certain level ground meter the problem of.
Description
Technical field
The utility model belongs to technical field of electronic equipment more particularly to a kind of surge for earth resistance tester is protected
Protection circuit and device.
Background technology
When earth resistance tester measures the ground resistance of earthed system, the test of generally use three electrode method is that is, logical
The position installation voltage interpole and electric current interpole for being earthing pole certain distance are crossed, has a certain distance between three poles.
However, when being tested ground resistance using three electrode method, since interpole connect with the earth, be struck by lightning when occurring or
When the case where person's surge, three extremely in appoint the two poles of the earth between will produce potential difference, will break when potential difference reaches a certain level
Ground meter.
Utility model content
The purpose of this utility model is to provide a kind of surge protection circuit and device for earth resistance tester, purports
Solve at present ground resistance is tested using three electrode method when, due to interpole with the earth connect, when generation be struck by lightning or
When the case where surge, three extremely in appoint the two poles of the earth between will produce potential difference, will break when potential difference reaches a certain level connects
The problem of ground resistance instrument.
The utility model embodiment provides a kind of surge protection circuit for earth resistance tester, the ground connection electricity
Resistance tester is respectively equipped with earthing pole, voltage interpole and electric current interpole, and the surge protection circuit includes：First clamper
Module, the second clamper module, third clamper module；
The first clamper module is connected between the earthing pole and the voltage interpole, the second clamper module
It is connected between the voltage interpole and the electric current interpole, the third clamper module is connected to the earthing pole and institute
It states between electric current interpole.
As one embodiment of the utility model, the first end of the first clamper module is connect with the earthing pole, described
The second end of first clamper module is connect with the voltage interpole.
As one embodiment of the utility model, the first end of the second clamper module is connect with the voltage interpole,
The second end of the second clamper module is connect with the electric current interpole.
As one embodiment of the utility model, the first end of the third clamper module is connect with the earthing pole, described
The second end of third clamper module is connect with the electric current interpole.
The another object of the utility model is that it includes any one of above-described embodiment surge protection circuit to provide a kind of
The surge protective device for earth resistance tester.
A kind of surge protection circuit and device for earth resistance tester in the utility model, surge protection electricity
Road includes：First clamper module, the second clamper module and third clamper module, by the way that the first clamper module to be connected to
Between the earthing pole and voltage interpole of the earth resistance tester, the second clamper module is connected to the ground resistance
Between the voltage interpole and electric current interpole of tester, the third clamper module is connected to the earth resistance tester
Between earthing pole and electric current interpole, electricity will be grounded by the first clamper module, the second clamper module and third clamper module
The potential difference clamper between three electrodes of tester is hindered in predeterminable area, to play the role of surge protection, is solved and is adopted at present
When being tested ground resistance with three electrode method, since interpole is connect with the earth, when there is a situation where lightning stroke or surge,
Three extremely in appoint the two poles of the earth between will produce potential difference, the ground meter that will break when potential difference reaches a certain level is asked
Topic.
Description of the drawings
Fig. 1 is a kind of electricity for surge protection circuit for earth resistance tester that the utility model embodiment 1 provides
Line structure figure；
Fig. 2 is a kind of electricity for surge protection circuit for earth resistance tester that the utility model embodiment 2 provides
Line structure figure.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Fig. 1 is a kind of surge protection circuit for earth resistance tester 10 that the utility model embodiment 1 provides
Circuit structure diagram, for convenience of description, only the parts related to this embodiment are shown, and details are as follows：
As shown in Figure 1, the surge protection circuit in the present embodiment includes：First clamper module 21, the second clamper module 22,
Third clamper module 23, it is auxiliary that the earth resistance tester in the present embodiment is respectively equipped with earthing pole, voltage interpole and electric current
Help pole；Specifically, the first clamper module 21 is connected between the earthing pole of earth resistance tester 10 and voltage interpole, second
Clamper module 22 is connected between the voltage interpole of earth resistance tester 10 and electric current interpole, and third clamper module 23 connects
It is connected between the earthing pole of earth resistance tester 10 and electric current interpole.
In the present embodiment, under normal circumstances, between the earthing pole of earth resistance tester 10 and voltage interpole, ground connection
Between the voltage interpole and electric current interpole of resistance meter 10, the earthing pole of earth resistance tester 10 and electric current interpole
Between operating voltage be less than leading for the clampers module such as the first clamper module 21, the second clamper module 22, third clamper module 23
Be powered pressure, and therefore, the clampers module such as the first clamper module 21, the second clamper module 22, third clamper module 23 is for ground connection electricity
The normal work of resistance tester 10 does not influence, when the case where having thunder and lightning or surge occurs, earth resistance tester 10
Between earthing pole and voltage interpole, between the voltage interpole and electric current interpole of earth resistance tester 10 or ground connection electricity
It hinders and will produce potential difference between the earthing pole and electric current interpole of tester 10, when potential difference reaches the first clamper module 21, the
When the conducting voltages of clampers module such as two clamper modules 22, third clamper module 23, the first clamper module 21, the second clamper module
22, the clampers such as third clamper module 23 module will be connected, by by potential difference clamper in their breakdown voltage, to make to connect
Ground resistance instrument is protected at work.
As one embodiment of the utility model, user can be as needed to the first clamper module 21, the second clamper module
22, the conducting voltage of third clamper module 23 is limited, so that ground meter is prevented under different application environments
Surge protection.
Fig. 2 is a kind of surge protection circuit for earth resistance tester 10 that the utility model embodiment 2 provides
Circuit structure diagram, as shown in Fig. 2, the first end of the first clamper module 21 is connect with earthing pole, the second of the first clamper module 21
End is connect with voltage interpole.
As one embodiment of the utility model, referring to Fig. 2, the first clamper module 21 includes：First transient state inhibits two poles
Pipe TVS1 and the first discharge tube GDT1；Specifically, the first end of the first Transient Suppression Diode TVS1 and the first discharge tube GDT1
First end connect the first end as the first clamper module 21 altogether, the second end of the first Transient Suppression Diode TVS1 and first is put
The second end of fulgurite GDT1 connects the second end as the first clamper module 21 altogether.
As one embodiment of the utility model, the first discharge tube GDT1 can be gas-discharge tube, the sound of gas-discharge tube
Generally in hundreds of nanoseconds (ns) so that between several milliseconds (ms) between seasonable, response speed is slower, and Transient Suppression Diode
The response time of (Transient Voltage Suppressor, TVS) is up to picosecond (ps) rank；On the other hand, gas is put
The through-current capacity of fulgurite is bigger than TVS pipe, and gas-discharge tube is used for most prime, and the protection circuit of following stage is made of TVS pipe, this
The response time of device is quickly, more preferable to the protecting effect of late-class circuit.
As one embodiment of the utility model, referring to Fig. 2, the first end of the second clamper module 22 connects with voltage interpole
It connects, the second end of the second clamper module 22 is connect with electric current interpole.
As one embodiment of the utility model, referring to Fig. 2, the second clamper module 22 includes：Second transient state inhibits two poles
Pipe TVS2 and the second discharge tube GDT2；Specifically, the first end of the second Transient Suppression Diode TVS2 and the second discharge tube GDT2
First end connect the first end as the second clamper module 22 altogether, the second end of the second Transient Suppression Diode TVS2 and second is put
The second end of fulgurite GDT2 connects the second end as the second clamper module 22 altogether.
As one embodiment of the utility model, the second discharge tube GDT2 can be gas-discharge tube.
As one embodiment of the utility model, referring to Fig. 2, the first end of third clamper module 23 is connect with earthing pole,
The second end of third clamper module 23 is connect with electric current interpole.
As one embodiment of the utility model, referring to Fig. 2, third clamper module 23 includes：Third transient state inhibits two poles
Pipe TVS3 and third discharge tube GDT3；Specifically, the first end and third discharge tube GDT3 of third Transient Suppression Diode TVS3
First end connect the first end as third clamper module 23 altogether, the second end and third of third Transient Suppression Diode TVS3 are put
The second end of fulgurite GDT3 connects the second end as third clamper module 23 altogether.
As one embodiment of the utility model, third discharge tube GDT3 can be gas-discharge tube.
As one embodiment of the utility model, the surge guarantor for earth resistance tester 10 is also proposed in the present embodiment
Protection unit, the surge protective device include the surge protection circuit as described in any one of above-described embodiment.
A kind of surge protection circuit and device for earth resistance tester that the utility model embodiment provides, the wave
Gushing protection circuit includes：First clamper module, the second clamper module and third clamper module, by by the first clamper mould
Block is connected between the earthing pole of the earth resistance tester and voltage interpole, and the second clamper module is connected to described
Between the voltage interpole and electric current interpole of earth resistance tester, the third clamper module is connected to the ground resistance
Between the earthing pole and electric current interpole of tester, pass through the first clamper module, the second clamper module and third clamper module
By the potential difference clamper between three electrodes of earth resistance tester in predeterminable area, to play the role of surge protection, solve
It is current when being tested ground resistance using three electrode method, since interpole connect with the earth, when generation is struck by lightning or surge
The case where when, three extremely in appoint the two poles of the earth between will produce potential difference, will break when potential difference reaches a certain level ground connection electricity
The problem of hindering instrument.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle
Within the scope of shield.
Claims (8)
1. a kind of surge protection circuit for earth resistance tester, the earth resistance tester be respectively equipped with earthing pole,
Voltage interpole and electric current interpole, which is characterized in that the surge protection circuit includes the first clamper module, the second clamper
Module and third clamper module；
The first clamper module is connected between the earthing pole and the voltage interpole, the second clamper module connection
Between the voltage interpole and the electric current interpole, the third clamper module is connected to the earthing pole and the electricity
Between stream interpole.
2. surge protection circuit as described in claim 1, which is characterized in that the first end of the first clamper module with it is described
Earthing pole connects, and the second end of the first clamper module is connect with the voltage interpole.
3. surge protection circuit as claimed in claim 2, which is characterized in that the first clamper module includes：First transient state
Inhibit diode and the first discharge tube；
The first end of first Transient Suppression Diode and the first end of first discharge tube are connect altogether as first pincers
The second end of the first end of position module, the second end of first Transient Suppression Diode and first discharge tube connects conduct altogether
The second end of the first clamper module.
4. surge protection circuit as described in claim 1, which is characterized in that the first end of the second clamper module with it is described
Voltage interpole connects, and the second end of the second clamper module is connect with the electric current interpole.
5. surge protection circuit as claimed in claim 4, which is characterized in that the second clamper module includes：Second transient state
Inhibit diode and the second discharge tube；
The first end of second Transient Suppression Diode and the first end of second discharge tube are connect altogether as second pincers
The second end of the first end of position module, the second end of second Transient Suppression Diode and second discharge tube connects conduct altogether
The second end of the second clamper module.
6. surge protection circuit as described in claim 1, which is characterized in that the first end of the third clamper module with it is described
Earthing pole connects, and the second end of the third clamper module is connect with the electric current interpole.
7. surge protection circuit as claimed in claim 6, which is characterized in that the third clamper module includes：Third transient state
Inhibit diode and third discharge tube；
The first end of the third Transient Suppression Diode and the first end of the third discharge tube connect altogether to clamp as the third
The second end of the first end of position module, the second end of the third Transient Suppression Diode and the third discharge tube connects conduct altogether
The second end of the third clamper module.
8. a kind of surge protective device for earth resistance tester, which is characterized in that the surge protective device includes such as
Surge protection circuit described in any one of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820543608.2U CN207994621U (en) | 2018-04-13 | 2018-04-13 | A kind of surge protection circuit and device for earth resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820543608.2U CN207994621U (en) | 2018-04-13 | 2018-04-13 | A kind of surge protection circuit and device for earth resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207994621U true CN207994621U (en) | 2018-10-19 |
Family
ID=63831013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820543608.2U Active CN207994621U (en) | 2018-04-13 | 2018-04-13 | A kind of surge protection circuit and device for earth resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207994621U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512206A (en) * | 2018-04-13 | 2018-09-07 | 深圳远征技术有限公司 | A kind of surge protection circuit and device for earth resistance tester |
-
2018
- 2018-04-13 CN CN201820543608.2U patent/CN207994621U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512206A (en) * | 2018-04-13 | 2018-09-07 | 深圳远征技术有限公司 | A kind of surge protection circuit and device for earth resistance tester |
| WO2019196164A1 (en) * | 2018-04-13 | 2019-10-17 | 深圳远征技术有限公司 | Surge protection circuit and apparatus for ground resistance tester |
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