CN202305677U - Novel resistance detector of earth screen having large interference current - Google Patents
Novel resistance detector of earth screen having large interference current Download PDFInfo
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- CN202305677U CN202305677U CN2011203884129U CN201120388412U CN202305677U CN 202305677 U CN202305677 U CN 202305677U CN 2011203884129 U CN2011203884129 U CN 2011203884129U CN 201120388412 U CN201120388412 U CN 201120388412U CN 202305677 U CN202305677 U CN 202305677U
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Abstract
The utility model provides a novel resistance detector of an earth screen having large interference current. The novel resistance detector of the earth screen having the large interference current includes a microprocessor (1), a current signal collecting circuit (2) connecting with the microprocessor (1) through an A/D circuit I (6), and a voltage signal collecting circuit (3) connecting with the microprocessor (1) through the A/D circuit II (5). An isolation operational amplifier (4) is arranged between the voltage signal collecting circuit (3) and the A/D circuit II (5). The novel resistance detector of the earth screen having the large interference current also includes a frequency-selecting circuit (7) and a frequency-selecting control circuit (8). The frequency-selecting control circuit (8) connects with the microprocessor (1) and the frequency of the frequency-selecting circuit (7) is controlled through the microprocessor (1). The frequency-selecting circuit (7) connects with the current signal collecting circuit (2) and the voltage signal collecting circuit (3), thereby controlling the operation frequency. The novel resistance detector of the earth screen having the large interference current in the utility model can utilize small current for measuring and has an advantage that the measuring data is accurate.
Description
Technical field
The utility model relates to electronic applications, relates in particular to a kind of electron detection device, specifically is meant a kind of novel perturbation electric current earth mat resistance monitor.
Background technology
Usually to utilize earth mat to improve the reliability of ground connection the ground connection in high voltage power transmission field; For the safety that guarantees ground connection then earth mat resistance be a very important parameters index, too high and cause potential safety hazard like the excessive touch voltage that then can cause of earth mat resistance to human body.
Thereby detect ground connection timely and whether well then need the stake resistance detector that stake resistance is measured; Thereby cause interference for the measurement of stake resistance owing to itself have electric current to flow through when measuring because in the ground wire; Conventional measurement then is to utilize the big electric current that many bigger than ground current to measure so that the interference of ground current is ignored; Though this measuring method circuit is simple; But owing to need great electric current, the lead of use more slightly and also needs the power supply of big electric current to support that present this measuring method is eliminated basically.
The measuring method that substitutes then is to adopt converter technique; Utilize the measurement electric current different to measure with the interference current frequency; And use filtering technique to get rid of the interference of interference current, advantages such as highly versatile and instrument volume are little, convenient test have obtained using widely this measuring method owing to having.
But above-mentioned frequency conversion measuring technology reality only is to have used a kind of measurement electric current different with interfering frequency to measure in measuring process; For in the medium earth mat resistance measurement of railway ground system with perturbation electric current; Since at railway through out-of-date; Interference current often will adopt above-mentioned frequency conversion measuring technique generally still will use relatively low frequency conversion to measure electric current and just must reach the purpose of comparatively accurately measuring up to amperes up to a hundred again.Thereby, need big electric current and the inaccurate problem of test data measured for the present ubiquity of the equipment of the measurement of the earth mat resistance under the perturbation current conditions.
The utility model content
The technical matters that the utility model will solve is to provide a kind of and utilize little electric current to measure and the novel accurately perturbation electric current of test data earth mat resistance monitor.
The technical solution of the utility model is; A kind of novel perturbation electric current earth mat resistance monitor is provided; Comprise microprocessor, connect the current signal Acquisition Circuit of microprocessor, connect the voltage signal acquisition circuit of microprocessor through A/D circuit I I through the A/D circuit I; Also be provided with the isolation operational amplifier between described voltage signal acquisition circuit and the A/D circuit; Also comprise frequency selection circuit and frequency-selecting control circuit, described frequency-selecting control circuit is connected with microprocessor and through the frequency of microprocessor control frequency selection circuit, described frequency selection circuit is connected to control its running frequency with the voltage signal acquisition circuit with the current signal Acquisition Circuit respectively.
As preferably, also comprise a kind of in the display that is connected with the microprocessor reason, printer, the keyboard or make up.
In sum; The utility model formula earth mat resistance monitor frequently is provided with frequency selection circuit and through the frequency-selecting control circuit running frequency of current signal Acquisition Circuit and voltage signal acquisition circuit is controlled; The detection of a plurality of frequency bands capable of using when earth mat resistance is detected like this, utilize then the software be installed in the microprocessor judge automatically and selects the general the most accurately earth mat resistance detection value calculate; And, also be provided with the isolation operational amplifier between voltage signal acquisition circuit of the utility model and the A/D circuit, improved the security of voltage signal acquisition, can effectively prevent infringement to the A/D circuit; In addition, the utility model keyboard also capable of using carries out the setting of parameter and display capable of using shows or through the printer prints test result of coming out.
Description of drawings
Fig. 1 is the circuit structure schematic block diagram of the novel perturbation electric current earth mat resistance monitor of the utility model.
Shown in the figure:
1, microprocessor, 2, the current signal Acquisition Circuit, 3, the voltage signal acquisition circuit, 4, isolate operational amplifier, 5, A/D circuit I I, 6, the A/D circuit I, 7, frequency selection circuit, 8, the frequency-selecting control circuit, 9, display, 10, printer, 11, keyboard.
Embodiment
For the technical scheme of the utility model better is described, be described in detail below in conjunction with the embodiment of accompanying drawing to the utility model.
Shown in accompanying drawing 1; A kind of novel perturbation electric current earth mat resistance monitor; Comprise microprocessor 1, connect the current signal Acquisition Circuit 2 of microprocessors 1, connect the voltage signal acquisition circuit 3 of microprocessor 1 through A/D circuit I I5 through A/D circuit I 6; Also be provided with between described voltage signal acquisition circuit 3 and the A/D circuit I I5 and isolate operational amplifier 4; Also comprise frequency selection circuit 7 and frequency-selecting control circuit 8, described frequency-selecting control circuit 8 is connected with microprocessor 1 and controls the frequency of frequency selection circuit 7 through microprocessor 1, and described frequency selection circuit 7 is connected with voltage signal acquisition circuit 3 to control its running frequency with current signal Acquisition Circuit 2 respectively; What be connected with microprocessor reason 1 in the present embodiment, also is provided with display 9, printer 10 and keyboard 11.
Should explain that each circuit module in the utility model is the circuit that arrives commonly used in the prior art, thereby its particular circuit configurations is no longer specified at this.
In the above-described embodiments; A kind of preferred forms of the utility model is described, obviously, under the inventive concept of the utility model; Still can make a lot of variations and improvement; At this, should explain that any change of under the inventive concept of the utility model, being made all will fall in the protection domain of the utility model.
Claims (2)
1. novel perturbation electric current earth mat resistance monitor; Comprise microprocessor (1), connect the current signal Acquisition Circuit (2) of microprocessor (1), connect the voltage signal acquisition circuit (3) of microprocessor (1) through A/D circuit I I (5) through A/D circuit I (6); It is characterized in that: also be provided with between described voltage signal acquisition circuit (3) and the A/D circuit (5) and isolate operational amplifier (4); Also comprise frequency selection circuit (7) and frequency-selecting control circuit (8); Described frequency-selecting control circuit (8) is connected with microprocessor (1) and through the frequency of microprocessor (1) control frequency selection circuit (7), described frequency selection circuit (7) is connected to control its running frequency with voltage signal acquisition circuit (3) with current signal Acquisition Circuit (2) respectively.
2. novel perturbation electric current earth mat resistance monitor according to claim 1 is characterized in that: also comprise a kind of in the display (9) that is connected with microprocessor reason (1), printer (10), the keyboard (11) or make up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203884129U CN202305677U (en) | 2011-10-13 | 2011-10-13 | Novel resistance detector of earth screen having large interference current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203884129U CN202305677U (en) | 2011-10-13 | 2011-10-13 | Novel resistance detector of earth screen having large interference current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305677U true CN202305677U (en) | 2012-07-04 |
Family
ID=46374549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203884129U Expired - Fee Related CN202305677U (en) | 2011-10-13 | 2011-10-13 | Novel resistance detector of earth screen having large interference current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202305677U (en) |
-
2011
- 2011-10-13 CN CN2011203884129U patent/CN202305677U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20131013 |