CN202351329U - Constant current different frequency voltage limiting type anti-interference ground grid resistance test system - Google Patents
Constant current different frequency voltage limiting type anti-interference ground grid resistance test system Download PDFInfo
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- CN202351329U CN202351329U CN2011204335415U CN201120433541U CN202351329U CN 202351329 U CN202351329 U CN 202351329U CN 2011204335415 U CN2011204335415 U CN 2011204335415U CN 201120433541 U CN201120433541 U CN 201120433541U CN 202351329 U CN202351329 U CN 202351329U
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Abstract
The utility model belongs to the technical field of electric power grounding device and relates to a constant current different frequency voltage limiting type anti-interference ground grid resistance test system. The utility model solves such technical problems as unreasonable design in the prior art, etc. The test system comprises a main control unit, wherein a display screen, an input device, a printer and a DC power supply are connected on the main control unit, a power supply control circuit is connected on the main control unit, the power supply control circuit is connected with an A/D (analog/digital) converting module via a current sampling circuit and a voltage sampling circuit, respectively, and the A/D converting module is connected with the main control unit. The constant current different frequency voltage limiting type anti-interference ground grid resistance test system has the advantages of having reasonable design and simple structure, well solving the problem of failing to obtain an accurate measurement result due to power frequency interference during a test process, greatly simplifying the test operation process, improving the precision and accuracy of test result, saving the test cost and reducing the labor intensity of test personnel, so that the test system can be used for conveniently and intuitively understanding and analyzing the grounding condition of grounding device.
Description
Technical field
The utility model belongs to device technique field power ground, relates to earth mat resistance detection system, especially relates to a kind of anti-interference earth mat resistance test system of constant current alien frequencies votage limit type that can measure multiple parameter.
Background technology
At present in electric system, mainly adopt power frequency, big electric current, three electrode method to measure to stake resistance, the impedance ground of large-scale earth mat.Insulation power frequency cranking test law regulation electric current is not less than 30A, can better prevent that just electrical network from disturbing because of the power frequency that operation produces, and just can obtain more accurate measurement result.Thus, need provide powerful power supply to measure, cause the testing equipment heaviness, test wires line footpath is big, problems such as the experimental measurement process is complicated, experimental measurement personnel's working strength is big, experimental measurement time length.
For this reason, people have carried out long-term exploration, have proposed various solutions.For example, the Chinese patent document discloses a kind of Resistance of Grounding Grids alien frequencies test macro [application number: 200820053888.5], is composed in series in regular turn by alien frequencies power supply, sensor, filtering circuit, A/D acquisition chip, single-chip microcomputer and touch-screen.This system changes into the signal in the acquisition chip sample range through sensor with voltage and current signal.
It is perfect inadequately that such scheme exists function, and it is convenient inadequately to manipulate, and the wiring labor capacity is big, and test result shows technical matterss such as directly perceived inadequately.
Summary of the invention
The purpose of the utility model is to the problems referred to above, provides a kind of reasonable in design, simple in structure, and diverse in function is easy for operation, the anti-interference earth mat resistance test system of constant current alien frequencies votage limit type that the measurement result precision is high.
For achieving the above object; The utility model has adopted following technical proposal: the anti-interference earth mat resistance test system of this constant current alien frequencies votage limit type, comprise main control unit, and on main control unit, be connected with display screen, input media, printer and direct supply; It is characterized in that; Be connected with power control circuit on the described main control unit, described power control circuit links to each other with the A/D modular converter with voltage sampling circuit through current sampling circuit respectively, and described A/D modular converter links to each other with main control unit.
In the above-mentioned anti-interference earth mat resistance test system of constant current alien frequencies votage limit type, described power control circuit comprises the variable-frequency power sources that links to each other with main control unit, on variable-frequency power sources, is connected with described isolating transformer.
In the above-mentioned anti-interference earth mat resistance test system of constant current alien frequencies votage limit type; Described current sampling circuit comprises the current amplifier that links to each other with power control circuit and is connected first wave filter on the current amplifier that described first wave filter links to each other with the A/D modular converter.
In the above-mentioned anti-interference earth mat resistance test system of constant current alien frequencies votage limit type; Described voltage sampling circuit comprises the voltage amplifier that links to each other with power control circuit and is connected second wave filter on the voltage amplifier that described second wave filter links to each other with the A/D modular converter.
Compared with prior art; The advantage of the anti-interference earth mat resistance test system of this constant current alien frequencies votage limit type is: reasonable in design; Simple in structure, solved well in the test process and disturbed the problem that can not get accurately measuring the result, short form test operating process greatly because of power frequency; Improved the precision and the accuracy of test result, saved experimentation cost, reduced the labour intensity of testing crew.Can make things convenient for the ground connection situation of understanding directly perceived, analysis earthing device.
Description of drawings
Fig. 1 is the structured flowchart that the utility model provides.
Fig. 2 is the detailed circuit diagram that the utility model provides.
Fig. 3 is the user mode figure of the utility model.
Among the figure, main control unit 1, display screen 2, input media 3, printer 4, direct supply 5, power control circuit 6, variable-frequency power sources 61, isolating transformer 62, current sampling circuit 7, current amplifier 71, first wave filter 72, voltage sampling circuit 8, voltage amplifier 81, second wave filter 82, A/D modular converter 9, current terminal 10, voltage end 11.
Embodiment
Shown in Fig. 1-3, the anti-interference earth mat resistance test system of this constant current alien frequencies votage limit type comprises main control unit 1, on main control unit 1, is connected with display screen 2, input media 3, printer 4 and direct supply 5.Be connected with power control circuit 6 on the main control unit 1; Power control circuit 6 links to each other with A/D modular converter 9 with voltage sampling circuit 8 through current sampling circuit 7 respectively; A/D modular converter 9 links to each other with main control unit 1; Be provided with current terminal 10 between described power control circuit 6 and the current sampling circuit 7, be provided with voltage end 11 between power control circuit 6 and the voltage sampling circuit 8.
Power control circuit 6 comprises the variable-frequency power sources 61 that links to each other with main control unit 1, on variable-frequency power sources 61, is connected with described isolating transformer 62.Current sampling circuit 7 comprises the current amplifier 71 that links to each other with power control circuit 6 and is connected first wave filter 72 on the current amplifier 71 that described first wave filter 72 links to each other with A/D modular converter 9.Voltage sampling circuit 8 comprises the voltage amplifier 81 that links to each other with power control circuit 6 and is connected second wave filter 82 on the voltage amplifier 81 that described second wave filter 82 links to each other with A/D modular converter 9.
Main control unit 1 is accepted to press key assignments, output print information, control survey start and stop, the frequency of control power work, voltage, electric current, the collection of data and processing.Display screen 2 shows measurement pattern, current system, frequency data, measurement result, historical data, calibration steps, comprehensive Chinese interface menu such as help information.Direct supply 5 provides the WV of instrument main control unit 1 with the work of each control module.Printer 4 printable current test result and historical datas.Input media 3 is set mode of operations, frequency, voltage, electric current, starts, stops, printing etc.Variable-frequency power sources 61 is according to the setup parameter work of main control unit 1, can setpoint frequency, voltage, electric current, and working method test pattern mode of operation when long.Voltage amplifier 81, second wave filter 82 are adopted and are assembled voltage signal, carry out amplification filtering.Current amplifier 71, first wave filter 72 are adopted and are assembled current signal, carry out amplification filtering.A/D modular converter 9 is converted into digital signal with the simulating signal that sampling obtains.
The utility model has adopted novel alien frequencies AC power, is provided at the different-frequency measure method that departs from power frequency 10Hz, in conjunction with modern computer processor to digital Signal Processing ability.Can under strong interference environment, accurately record the data that are equivalent under the power frequency 50Hz.The maximum output of measuring current 5A can not cause when test too highly because of the current potential of earthing device, can under the situation that power equipment does not have a power failure, measure stake resistance, step voltage, touch voltage.And, having solved well in the test process and disturbed the problem that can not get accurately measuring the result because of power frequency, short form test operating process has greatly improved precision and the accuracy of test result, saves experimentation cost, has reduced the labour intensity of testing crew.Can make things convenient for the ground connection situation of understanding directly perceived, analysis earthing device.
Measurement result power frequency equivalence is good, and the sinusoidal current of standard is provided, and optional frequency is selected single-frequency: 45Hz, 50Hz, 55Hz, 60Hz, 65Hz.Double frequency 45Hz/55Hz, 55Hz/60Hz, the 47.5Hz/52.5Hz. frequency error is less than 0.1HZ.The interference performance of anti-power frequency is strong, and the present invention adopts the non-power-frequency current method that grounded screen is measured, and cooperates existing hardware filtering, and the global function digital filtering obtains more accurate test findings under strongly disturbing environment.Interference voltage is less than 10V.The measurement result precision is high, and fundamental error is ± 1% ± 0.01 Ω, is suitable for to measure the very little large-scale earth mat of impedance ground.Employing standard four-electrode method voltage separates with current sample, eliminates the measuring error that lead causes.Apparatus measures is powerful.Can measure earth-continuity, voltage stake contact resistance, Resistance of Grounding Grids, earthing device step voltage, earthing device touch voltage.Measuring process is simple to operate.Full menu in Chinese formula operation directly demonstrates measurement result.The wiring labor capacity is little, need not big electric current line.Circuit structure is simple, adopts digital data processing, and the hardware filtering circuit is simple, and debugging is convenient.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as main control unit 1, display screen 2, input media 3, printer 4, direct supply 5, power control circuit 6, variable-frequency power sources 61, isolating transformer 62, current sampling circuit 7, current amplifier 71, first wave filter 72, voltage sampling circuit 8, voltage amplifier 81, second wave filter 82, A/D modular converter 9, current terminal 10, voltage end 11 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.
Claims (4)
1. anti-interference earth mat resistance test system of constant current alien frequencies votage limit type; Comprise main control unit (1); On main control unit (1), be connected with display screen (2), input media (3), printer (4) and direct supply (5); It is characterized in that; Be connected with power control circuit (6) on the described main control unit (1), described power control circuit (6) links to each other with A/D modular converter (9) with voltage sampling circuit (8) through current sampling circuit (7) respectively, and described A/D modular converter (9) links to each other with main control unit (1); Be provided with current terminal (10) between described power control circuit (6) and the current sampling circuit (7), be provided with voltage end (11) between described power control circuit (6) and the voltage sampling circuit (8).
2. the anti-interference earth mat resistance test system of constant current alien frequencies votage limit type according to claim 1; It is characterized in that; Described power control circuit (6) comprises the variable-frequency power sources (61) that links to each other with main control unit (1), on variable-frequency power sources (61), is connected with described isolating transformer (62).
3. the anti-interference earth mat resistance test system of constant current alien frequencies votage limit type according to claim 2; It is characterized in that; Described current sampling circuit (7) comprises the current amplifier (71) that links to each other with power control circuit (6) and is connected first wave filter (72) on the current amplifier (71) that described first wave filter (72) links to each other with A/D modular converter (9).
4. the anti-interference earth mat resistance test system of constant current alien frequencies votage limit type according to claim 2; It is characterized in that; Described voltage sampling circuit (8) comprises the voltage amplifier (81) that links to each other with power control circuit (6) and is connected second wave filter (82) on the voltage amplifier (81) that described second wave filter (82) links to each other with A/D modular converter (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204335415U CN202351329U (en) | 2011-11-03 | 2011-11-03 | Constant current different frequency voltage limiting type anti-interference ground grid resistance test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204335415U CN202351329U (en) | 2011-11-03 | 2011-11-03 | Constant current different frequency voltage limiting type anti-interference ground grid resistance test system |
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| CN202351329U true CN202351329U (en) | 2012-07-25 |
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| CN2011204335415U Expired - Fee Related CN202351329U (en) | 2011-11-03 | 2011-11-03 | Constant current different frequency voltage limiting type anti-interference ground grid resistance test system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777368A (en) * | 2015-05-05 | 2015-07-15 | 成都电兴科技有限责任公司 | On-line monitoring instrument and detection method of alternating current variable-frequency ground resistor |
| CN107102207A (en) * | 2016-12-02 | 2017-08-29 | 国家电网公司 | A kind of earth loop impedance test instrument controlled based on microcomputer with signal transacting |
| CN110308329A (en) * | 2019-05-23 | 2019-10-08 | 江苏云脉电气有限公司 | High frequency sweep impedance ground specificity analysis instrument |
| CN111880008A (en) * | 2020-08-07 | 2020-11-03 | 中国南方电网有限责任公司超高压输电公司梧州局 | Comprehensive tester for ground net conduction |
-
2011
- 2011-11-03 CN CN2011204335415U patent/CN202351329U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777368A (en) * | 2015-05-05 | 2015-07-15 | 成都电兴科技有限责任公司 | On-line monitoring instrument and detection method of alternating current variable-frequency ground resistor |
| CN104777368B (en) * | 2015-05-05 | 2016-03-02 | 成都电兴科技有限责任公司 | AC frequency conversion stake resistance on-line computing model and detection method |
| CN107102207A (en) * | 2016-12-02 | 2017-08-29 | 国家电网公司 | A kind of earth loop impedance test instrument controlled based on microcomputer with signal transacting |
| CN110308329A (en) * | 2019-05-23 | 2019-10-08 | 江苏云脉电气有限公司 | High frequency sweep impedance ground specificity analysis instrument |
| CN111880008A (en) * | 2020-08-07 | 2020-11-03 | 中国南方电网有限责任公司超高压输电公司梧州局 | Comprehensive tester for ground net conduction |
| CN111880008B (en) * | 2020-08-07 | 2021-12-07 | 中国南方电网有限责任公司超高压输电公司梧州局 | Comprehensive tester for ground net conduction |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20141103 |
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| EXPY | Termination of patent right or utility model |