CN202305676U - Frequency hopping type earth screen resistance detector - Google Patents
Frequency hopping type earth screen resistance detector Download PDFInfo
- Publication number
- CN202305676U CN202305676U CN2011203883906U CN201120388390U CN202305676U CN 202305676 U CN202305676 U CN 202305676U CN 2011203883906 U CN2011203883906 U CN 2011203883906U CN 201120388390 U CN201120388390 U CN 201120388390U CN 202305676 U CN202305676 U CN 202305676U
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- microprocessor
- signal acquisition
- frequency hopping
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Abstract
The utility model provides a frequency hopping type earth screen resistance detector, which comprises a microprocessor (1), a current signal collection circuit (2) connected with the microprocessor (1) through an analog/digital (A/D) circuit I (6) and a voltage signal collection circuit (3) connected with the microprocessor (1) through an A/D circuit II (5) and further comprises a frequency selecting circuit (7) and a frequency selecting control circuit (8), the frequency selecting control circuit (8) is connected with the microprocessor (1) and controls frequency of the frequency selecting circuit (7) through the microprocessor (1), and the frequency selecting circuit (7) is respectively connected with the current signal collection circuit (2) and the voltage signal collection circuit (3) to control the operation frequency of the circuits. The frequency hopping type earth screen resistance detector has the advantages of utilizing small current for measurement and being accurate in test data.
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 frequency hopping 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 the earth mat resistance measurement in the railway ground system; 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, provides a kind of and utilizes little electric current to measure and test data frequency hopping earth mat resistance monitor accurately.
The technical solution of the utility model is; A kind of frequency hopping 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 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 be provided with the isolation operational amplifier between described voltage signal acquisition circuit and the A/D circuit.
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 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; In addition, 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 the A/D circuit;
Description of drawings
Fig. 1 is the circuit structure schematic block diagram of the frequency hopping 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 frequency hopping 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 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 with voltage signal acquisition circuit 3 to control its running frequency with current signal Acquisition Circuit 2 respectively; In the present embodiment, also be provided with between described voltage signal acquisition circuit 3 and the A/D circuit I I5 and isolate operational amplifier 4, what be connected with microprocessor reason 1 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 (3)
1. frequency hopping 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 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. frequency hopping earth mat resistance monitor according to claim 1 is characterized in that: also is provided with between described voltage signal acquisition circuit (3) and the A/D circuit (5) and isolates operational amplifier (4),
3. frequency hopping 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 |
|---|---|---|---|
| CN2011203883906U CN202305676U (en) | 2011-10-13 | 2011-10-13 | Frequency hopping type earth screen resistance detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203883906U CN202305676U (en) | 2011-10-13 | 2011-10-13 | Frequency hopping type earth screen resistance detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305676U true CN202305676U (en) | 2012-07-04 |
Family
ID=46374548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203883906U Expired - Fee Related CN202305676U (en) | 2011-10-13 | 2011-10-13 | Frequency hopping type earth screen resistance detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202305676U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155525A (en) * | 2014-05-14 | 2014-11-19 | 国家电网公司 | Multi-frequency scanning type tower grounding resistance measurement apparatus and method |
| CN104267263A (en) * | 2014-09-15 | 2015-01-07 | 北京东方计量测试研究所 | Method and device for measuring resistance of branches of ground wire network |
-
2011
- 2011-10-13 CN CN2011203883906U patent/CN202305676U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155525A (en) * | 2014-05-14 | 2014-11-19 | 国家电网公司 | Multi-frequency scanning type tower grounding resistance measurement apparatus and method |
| CN104267263A (en) * | 2014-09-15 | 2015-01-07 | 北京东方计量测试研究所 | Method and device for measuring resistance of branches of ground wire network |
| CN104267263B (en) * | 2014-09-15 | 2017-05-03 | 北京东方计量测试研究所 | Method and device for measuring resistance of branches of ground wire network |
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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 |