CN1635384A - Test circuit and test method for earth resistance - Google Patents
Test circuit and test method for earth resistance Download PDFInfo
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- CN1635384A CN1635384A CN 200410077534 CN200410077534A CN1635384A CN 1635384 A CN1635384 A CN 1635384A CN 200410077534 CN200410077534 CN 200410077534 CN 200410077534 A CN200410077534 A CN 200410077534A CN 1635384 A CN1635384 A CN 1635384A
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Abstract
This invention relates to an earth connecting resistance measurement circuit, which mainly comprises earth resistance test unit composed of microprocessor, frequency generator, and scanning power enlarging part, clamp coil, standard model generator, comparer, and A/D converter. The said clamp coil is connected to both ends of resistance to be measured to receive the damp information of the resistance. The clamp coil joints leading part are separately connected to the frequency generator and comparer. The standard model generator is connected to the comparer and the enlarger is connected to the back of the comparer.
Description
Technical field
The present invention relates to a kind of earth resistance circuit and method of testing, particularly a kind of damping ground resistance test cell and method of testing.
Background technology
To the test of stake resistance, be the necessary step of electrical safety inspection and earth work final acceptance of construction.Existing grounding resistance measurement extensively adopts megger formula industrial frequency electric resistance measuring instrument or impulse resistance measuring instrument, because the potential electrode radius is big, under the big environment of urban architecture density, to measure difficulty big, underground pipe network has a strong impact on measuring accuracy.In addition, adopt the jaw type ground resistance measuring instrument of import to cost an arm and a leg, measurement is subjected to systematic influence big, and the test data read-write must be returned original production factory and be carried out data write, or adopts special-purpose read-write equipment, this read-write equipment costliness.
As depicted in figs. 1 and 2, be the present circuit theory diagrams of the method for testing of normal voltammetry that adopts and jaw type grounding resistance measurement.As shown in Figure 1 be the voltammetry method of testing, wherein, the A point is tested pilot, A point stake resistance RA=U/I.This method of testing needs the independent ground connection section that disconnects, and has influenced the operate as normal of system.The method workload and space requirement are all very big, wherein need increase the auxiliary earth point of B and C.And AB, BC distance generally must more than 20 meters guaranteeing measuring accuracy, and power supply adopts hand power, precision more be cannot say for sure card.
Jaw type ground resistance measurement method as shown in Figure 2 is in the system of its general use ground multipoint earthing.
Ra＝Vt/Ia+(1/Rb+1/Rc+1/Rd+1/Re……)
When earth point is many, can draw Vt/Ia 〉=(1/Rb+1/Rc+1/Rd+1/Re ...), can be similar to and draw Ra ≈ Vt/Ia.This measuring method, it is comparatively convenient to operate, only need two jaw head are placed about 1 meter of the conductor wire of measurement, just can obtain a result, but it needs abundant earth point, guarantee measuring accuracy, for the measurement result that system drew of having only high point or two or three earth points, error will be quite big.
Summary of the invention
Technical matters to be solved by this invention is: a kind of metering system is easy and measuring accuracy is high earth resistance circuit and method of testing are provided.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the test circuit that a kind of stake resistance is provided, mainly hinder test cell with comprising, with hinder test result transmitter unit and the test result receiving element that test cell is connected describedly, hinder test cell describedly and mainly include microprocessor, frequency generator, scan power is amplified, the jaw coil, the master pattern maker, comparer and analog to digital converter, described jaw coil is connected on the two ends for the treatment of the geodetic resistance, it can receive the damping information for the treatment of the geodetic resistance, the joint extension line of jaw coil is connected on frequency generator and the comparer, and described frequency generator is used to produce and is carried in the sweep frequency for the treatment of in the geodetic resistance; Be used for the comparative standard model and in the master pattern maker, can generate, this master pattern generator is connected with comparer, the data that the jaw coil is obtained can be in comparer be compared with the parameter of master pattern in the master pattern generator, and produce a comparative result, the amplifier that is connected the back level of comparer can amplify this comparative result, and through the A/D converter conversion, the result after will amplifying at last inputs in the microprocessor.
In the further improvement of the technical program, described test result transmitter unit adopts the radiating circuit of non-contact IC card induction, it includes an encoder/decoder and an emitter, scrambler/decoding links to each other with the microprocessor that ground hinders in the test cell, its test result can be encoded into can wireless transmit form, emitter is launched it.
In the further improvement of the technical program, described test result receiving element is a Wireless IC card, and it is used for message pick-up and storage, and it comprises a microprocessor, linking to each other with this microprocessor is connected to storer and encoder/decoder, and this encoder/decoder is connected with receiving trap.
In the further improvement of the technical program, described storer is EEPROM.
The present invention also provides a kind of method of testing of stake resistance, and it comprises the steps:
Generate the model parameter of standard by the master pattern maker;
The jaw coil is connected on the two ends for the treatment of the geodetic resistance;
Frequency generator treats that to this geodetic resistance carries out frequency sweeping;
Damping value that comparer will be obtained from the jaw coil and the parameter the master pattern maker compare, and draw a comparative result;
Amplifier amplifies this comparative result, and is transferred to microprocessor through the A/D converter conversion;
Microprocessor is through calculating the measured value for the treatment of the geodetic resistance.
In the further improvement of the technical program, also comprise by wireless mode this is treated that measured value of geodetic resistance stores the step in the storer of test result receiving element into.
Beneficial effect of the present invention is: the present invention is by the damping of different frequency scan test system, in order to determine stake resistance.This is a kind of novel test method that is used for stake resistance, and the present invention simplifies process and the workload that has loaded down with trivial details earth resistance now, and the precision that has improved test.The present invention has solved circuit well to the requirement highly sensitive, that sample rate is fast, is particularly useful for the little current peak collection of the earth resonance.
Description of drawings
Fig. 1 is existing a kind of grounding resistance measurement circuit theory diagrams.
Fig. 2 is existing another kind of grounding resistance measurement circuit theory diagrams.
Fig. 3 is a schematic block circuit diagram of the present invention.
Embodiment
As shown in Figure 3, be schematic block circuit diagram of the present invention.The present invention mainly hinders test cell, test result transmitter unit and test result receiving element with comprising.Wherein, resistance test cell in ground mainly includes microprocessor, frequency generator, scan power amplification, jaw coil, master pattern maker, comparer and A/D converter (analog to digital converter).Described jaw coil is connected on the two ends for the treatment of the geodetic resistance, and it can receive the damping information for the treatment of the geodetic resistance.The joint extension line of jaw coil is connected on frequency generator and the comparer, and described frequency generator is used to produce sweep frequency; Be used for the comparative standard model and in the master pattern maker, can generate, this master pattern generator is connected with comparer, the data that the jaw coil is obtained can be compared with a certain model parameter in the master pattern generator in comparer, and produce a comparative result, the amplifier that is connected the back level of comparer can amplify this comparative result, and through the A/D converter conversion, the result after will amplifying at last passes to microprocessor.
The test result transmitter unit adopts the radiating circuit of non-contact IC card induction, and it includes an encoder/decoder and an emitter, and scrambler/decoding links to each other with the microprocessor that ground hinders in the test cell.Its test result can be encoded into can wireless transmit form, then emitter is launched it.
The test result receiving element is a Wireless IC card, and it can be used for message pick-up and storage.It comprises a microprocessor, and linking to each other with this microprocessor is connected to storer and encoder/decoder, and this encoder/decoder is connected with receiving trap.Storer adopt can be erasable EEPROM (electricallyerasable ROM (EEROM)).In this test result receiving element, adopt independently power supply power supply.
In the present invention, at first to generate the model parameter of standard by the master pattern maker; The jaw coil is connected on the two ends for the treatment of the geodetic resistance; Frequency generator can treat that geodetic resistance carries out frequency sweeping to this; Damping value that comparer will be obtained from the jaw coil and the parameter the master pattern maker compare; Amplifier carries out processing and amplifying with this comparative result, and is transferred to microprocessor through the A/D converter conversion, and microprocessor is through calculating the occurrence of institute's geodetic resistance.Store in the storer of test result receiving element into by the occurrence that wireless mode will the resistance of this ground.
Test mode of the present invention is simple, only needs a jaw coil.Utilize the mode of frequency sweeping, antijamming capability is improved greatly, overcome the shortcoming that current measuring method can't be measured under big electromagnetic interference (EMI), be applicable to single-point grounding and multipoint earthing system, measuring accuracy only is subject to the precision of A/D and the precision of master pattern.
Adopt IC-card to store to test data, utilize wireless mode to read and write, it is quite convenient to read and write; The confidentiality height; Data are difficult for losing.
Claims (6)
1. the test circuit of a stake resistance, mainly hinder test cell with comprising, it is characterized in that: hinder test cell describedly and mainly include microprocessor, frequency generator, scan power amplification, jaw coil, master pattern maker, comparer and analog to digital converter, described jaw coil is connected on the two ends for the treatment of the geodetic resistance, it can receive the damping information for the treatment of the geodetic resistance, the joint extension line of jaw coil is connected on frequency generator and the comparer, and described frequency generator is used to produce and is carried in the sweep frequency for the treatment of in the geodetic resistance; Be used for the comparative standard model and in the master pattern maker, can generate, this master pattern generator is connected with comparer, the data that the jaw coil is obtained can be in comparer be compared with the parameter of master pattern in the master pattern generator, and produce a comparative result, the amplifier that is connected the back level of comparer can amplify this comparative result, and through the A/D converter conversion, the result after will amplifying at last inputs in the microprocessor.
2. the test circuit of a kind of stake resistance as claimed in claim 1, it is characterized in that: further include one with hinder the test result transmitter unit that test cell is connected describedly, this test result transmitter unit adopts the radiating circuit of non-contact IC card induction, it includes an encoder/decoder and an emitter, scrambler/decoding links to each other with the microprocessor that ground hinders in the test cell, its test result can be encoded into can wireless transmit form, emitter is launched it.
3. the test circuit of a kind of stake resistance as claimed in claim 2, it is characterized in that: further comprise a test result receiving element, this test result receiving element is a Wireless IC card, it is used for message pick-up and storage, it comprises a microprocessor, linking to each other with this microprocessor is connected to storer and encoder/decoder, and this encoder/decoder is connected with receiving trap.
4. the test circuit of a kind of stake resistance as claimed in claim 3, it is characterized in that: described storer is EEPROM.
5. the method for testing of a stake resistance is characterized in that comprising the steps:
Generate the model parameter of standard by the master pattern maker;
The jaw coil is connected on the two ends for the treatment of the geodetic resistance;
Frequency generator treats that to this geodetic resistance carries out frequency sweeping;
Damping value that comparer will be obtained from the jaw coil and the parameter the master pattern maker compare, and draw a comparative result;
Amplifier amplifies this comparative result, and is transferred to microprocessor through the A/D converter conversion;
Microprocessor is through calculating the measured value for the treatment of the geodetic resistance.
6. the method for testing of stake resistance as claimed in claim 5 is characterized in that: further comprise by wireless mode this is treated that measured value of geodetic resistance stores the step in the storer of test result receiving element into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100775340A CN1308695C (en) | 2004-12-23 | 2004-12-23 | Test circuit and test method for earth resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100775340A CN1308695C (en) | 2004-12-23 | 2004-12-23 | Test circuit and test method for earth resistance |
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| CN1635384A true CN1635384A (en) | 2005-07-06 |
| CN1308695C CN1308695C (en) | 2007-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100775340A Expired - Fee Related CN1308695C (en) | 2004-12-23 | 2004-12-23 | Test circuit and test method for earth resistance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397087C (en) * | 2006-02-21 | 2008-06-25 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN103499746A (en) * | 2013-09-27 | 2014-01-08 | 湖北省防雷中心 | Differnet-end double-display type earth resistance tester |
| CN103792434A (en) * | 2014-03-05 | 2014-05-14 | 国家电网公司 | Ground resistance monitoring device and monitoring method thereof |
| CN103792432A (en) * | 2014-01-15 | 2014-05-14 | 北京东方计量测试研究所 | Earth resistance meter and handheld terminal |
| CN104880607A (en) * | 2015-04-30 | 2015-09-02 | 国家电网公司 | GPS automatic positioning detection method and apparatus for grounding resistance |
| CN104950183A (en) * | 2015-07-21 | 2015-09-30 | 厦门一联高科信息技术有限公司 | Non-contact grounding line resistance detector |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| JPH10104290A (en) * | 1996-09-26 | 1998-04-24 | Terushi Sakurai | Digital grounding resistance measuring device |
| CN2322150Y (en) * | 1997-05-16 | 1999-06-02 | 武汉北苑科技开发公司 | Digital ground resistance tester |
| CN100473993C (en) * | 1999-09-17 | 2009-04-01 | 杨学昌 | Monitor of grounding system |
| US6396284B1 (en) * | 2000-06-09 | 2002-05-28 | Ramcom Systems, Inc. | Ground resistance monitor |
-
2004
- 2004-12-23 CN CNB2004100775340A patent/CN1308695C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397087C (en) * | 2006-02-21 | 2008-06-25 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN103499746A (en) * | 2013-09-27 | 2014-01-08 | 湖北省防雷中心 | Differnet-end double-display type earth resistance tester |
| CN103792432A (en) * | 2014-01-15 | 2014-05-14 | 北京东方计量测试研究所 | Earth resistance meter and handheld terminal |
| CN103792434A (en) * | 2014-03-05 | 2014-05-14 | 国家电网公司 | Ground resistance monitoring device and monitoring method thereof |
| CN104880607A (en) * | 2015-04-30 | 2015-09-02 | 国家电网公司 | GPS automatic positioning detection method and apparatus for grounding resistance |
| CN104950183A (en) * | 2015-07-21 | 2015-09-30 | 厦门一联高科信息技术有限公司 | Non-contact grounding line resistance detector |
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| Publication number | Publication date |
|---|---|
| CN1308695C (en) | 2007-04-04 |
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Application publication date: 20050706 Assignee: Shenzhen universal blue sky Technology Co., Ltd. Assignor: Shenzhen Compton Electronic Technology Co., Ltd. Contract record no.: 2012440020210 Denomination of invention: Test circuit and test method for earth resistance Granted publication date: 20070404 License type: Exclusive License Record date: 20120725 |
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