CN104749444A - Grounding resistance measuring device - Google Patents
Grounding resistance measuring device Download PDFInfo
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- CN104749444A CN104749444A CN201310755033.2A CN201310755033A CN104749444A CN 104749444 A CN104749444 A CN 104749444A CN 201310755033 A CN201310755033 A CN 201310755033A CN 104749444 A CN104749444 A CN 104749444A
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- microprocessor
- earth resistance
- grounding
- sensor
- communication
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Abstract
Description
Technical field
The present invention relates to electric power electrical apparatus field, particularly relate to a kind of novel measurement of Grounding Resistance system.
Background technology
Thunder and lightning aloft to be discharged the special meteor of caused one by charged cloud.Thunder and lightning is the major reason causing electronic equipment to damage, and it threatens the safe and stable operation of the every field electronic informations such as building, railway, civil aviaton, communication, industry control, military affairs.Lightning protection is one of measure solved the problem, in current lightning protection field, earthing device be set to very one of the key link, not only relate to releasing of thunder and lightning, more be related to the normal operation of personal safety, device security and system, present various technical manuals to the concrete setting of earthing device, as parameter, inspection criterion etc. all have explicit stipulation.
The size of grounding resistance weighs one of important indicator that whether grounded screen meet design requirement, and grounding resistance increases the effect that directly can affect lightning protection, even causes operation irregularity and the damage of system equipment.So the state understanding stake resistance is in real time necessary very much, and accurately to obtain Resistance of Grounding Grids value, the most important thing is the measuring method that GPRS is correct and technology.
In the method and technology of measurement of Grounding Resistance, noncontact measuring method and pincerlike method are more advanced one, have plurality of advantages.But, the resistance that tester records is the resistance in the whole loop comprising tested stake resistance.Such as a shaft tower is had to the situation of four grounded downlead, adopting jaw type ground resistance meter test result to be the loop resistance that four down conductors are formed, is not stake resistance.This is its limitation, needs effectively to utilize surrounding environment, could measure the earthed system of the overwhelming majority with it.
Pincerlike ground resistance table in use should notice that " noise " disturbs, the interference of " noise " interference and line-frequency induction, zero-sequence current, harmonic wave and spurious signal, very large on test accuracy impact; Whether single-point grounding should be noted, by geodesic line whether with equipment connection because there is no reliable ground loop during single-point grounding, need auxiliary pile conjunction measuring, and beat pile and can cause destruction to a certain degree to working environment; Should measuring position be noted, choose suitable measurement point, because different measurement results is all different.The result in most cases measured is also incorrect, only overcomes these difficult problems, the ground stud ground resistance actual value that the resistance value of measurement will could be surveyed close to us.
Summary of the invention
Therefore, the present invention proposes a kind of earth resistance metering device, solves existing method Problems existing.
One of this pick-up unit principal feature is the problem disturbed for " noise ", a measurement is adopted by multifrequency, interference current and measuring marking current are separated, make it not enter measuring system, to this eliminate by the interference of line-frequency induction, zero-sequence current, harmonic wave and spurious signal to measuring the error brought.
Another principal feature of this pick-up unit is the problem for not having reliable ground loop, by utilizing the earth point of electric main via the earth and earth point to be measured and form the stake resistance that earth point to be measured is measured in loop, wherein the earth point of electric main can conveniently obtain.
A this measurement mechanism again principal feature is the problem for measuring position, and carrying out node motion by utilizing pincerlike ground resistance measurement mechanism can measure diverse location, and the result obtained is more accurate.
The present invention realizes by the following technical solutions: this earth connection measurement plant by earthing device, launch pincers, receive pincers, launch pincerlike sensor, reception pincerlike sensor, converter plant, program control device, microprocessor, display device and communication device form.The pincerlike sensor of described transmitting is connected with converter plant, described converter plant is connected with microprocessor, the pincerlike sensor of described reception is connected with program-controlled transducer, described program-controlled transducer is connected with microprocessor, described earthing device is connected with wire, described microprocessor can connecting communication device, display device, and pincerlike sensor is launched in described transmitting clipper joint, and pincerlike sensor is launched in described reception clipper joint.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention.
As shown in Figure 1: 1 is earthing device, 2 is launch pincerlike sensor, and 3 is converter plants, and 4 is communication devices, 5 is microprocessors, and 6 is receive pincerlike sensor, and 7 is program control devices, and 8 is display device, 9 is electric mains, and 10 is earth points to be measured, and 11 is launch pincers, and 12 is receive pincers.
Embodiment
Embodiment specific embodiments is as follows:
Earth connection measurement plant by earthing device (1), launch pincers (11), receive pincers (12), launch pincerlike sensor (2), receive pincerlike sensor (6), converter plant (3), program control device (7), microprocessor (5) and display device (8) and communication device (4) form.The pincerlike sensor of described transmitting (2) is connected with converter plant (3), described converter plant (3) is connected with microprocessor (5), the pincerlike sensor of described reception (6) is connected with program control device (7), described program control device (7) is connected with microprocessor (5), described microprocessor (5) can connecting communication device (4), display device (8), described transmitting pincers (11) connection launches pincerlike sensor (2), and described reception pincers (12) connection launches pincerlike sensor (6).
Described earthing device (1), connects the upper end of ground resistance wire to be measured, as the beginning of ground loop by wire.The earth point to be measured that the wire connected by this earthing device (1), earthing device, this wire connect, greatly, the ground wire of this electric main and the loop formed, to measure the stake resistance of tested point.
Described microprocessor (5), can control converter plant (3) and program control device (7), and signal can be exported to communication device (4) and display device (8).
The pincerlike sensor of described transmitting (2), utilizes Direct frequency synthesizer and discrete fourier technology, will differ from the sinusoidal wave frequency conversion voltage signal injection ground loop of undesired signal frequency.
The pincerlike sensor of described reception (6), utilizes genlock technology and integrated filter, the voltage in the ground loop required for collection, current signal.
Described converter plant (3), controls by microprocessor (5), in succession produces the multiple sine voltage signal differing from undesired signal frequency.
Described program control device (7), by Microprocessor S3C44B0X (5), adopts digital regulation resistance and Premium Plus programming amplifying technique, can automatic switching range.
Described display device (8), directly can show signal testing result.
Described communication device (4), can carry out down loading updating to microprocessor program.
Utilize technical scheme of the present invention, reach corresponding technique effect, or not departing from the technical scheme equivalents under design philosophy of the present invention, all within protection scope of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310755033.2A CN104749444A (en) | 2013-12-31 | 2013-12-31 | Grounding resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310755033.2A CN104749444A (en) | 2013-12-31 | 2013-12-31 | Grounding resistance measuring device |
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| Publication Number | Publication Date |
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| CN104749444A true CN104749444A (en) | 2015-07-01 |
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| CN201310755033.2A CN104749444A (en) | 2013-12-31 | 2013-12-31 | Grounding resistance measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931792A (en) * | 2015-06-23 | 2015-09-23 | 中山市木易万用仪器仪表有限公司 | Clamp-shaped insulation resistance test device |
| CN105445560A (en) * | 2015-11-26 | 2016-03-30 | 国家电网公司 | Grounding resistor tester measurement method based on ZC-8 type |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08248076A (en) * | 1995-03-14 | 1996-09-27 | Tohoku Denki Hoan Kyokai | Arithmetic expression type grounding resistance measuring instrument |
| CN2809654Y (en) * | 2005-06-24 | 2006-08-23 | 宋国娥 | Double-jaw ground resistance tester |
| CN1828313A (en) * | 2006-02-21 | 2006-09-06 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN201508392U (en) * | 2009-07-16 | 2010-06-16 | 福建省普华电子科技有限公司 | Frequency-conversion grounding resistance measuring instrument |
| CN201576056U (en) * | 2009-09-18 | 2010-09-08 | 山东电力集团公司潍坊供电公司 | Grounding resistance online detector based on TMS320LF2407A |
| CN201780335U (en) * | 2010-01-04 | 2011-03-30 | 广东电网公司广州供电局 | Ground resistance detecting device of overhead transmission line pole tower |
| CN102680798A (en) * | 2012-02-28 | 2012-09-19 | 山东建筑大学 | Online measurement method and device for grounding resistor of rod tower |
-
2013
- 2013-12-31 CN CN201310755033.2A patent/CN104749444A/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08248076A (en) * | 1995-03-14 | 1996-09-27 | Tohoku Denki Hoan Kyokai | Arithmetic expression type grounding resistance measuring instrument |
| CN2809654Y (en) * | 2005-06-24 | 2006-08-23 | 宋国娥 | Double-jaw ground resistance tester |
| CN1828313A (en) * | 2006-02-21 | 2006-09-06 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN201508392U (en) * | 2009-07-16 | 2010-06-16 | 福建省普华电子科技有限公司 | Frequency-conversion grounding resistance measuring instrument |
| CN201576056U (en) * | 2009-09-18 | 2010-09-08 | 山东电力集团公司潍坊供电公司 | Grounding resistance online detector based on TMS320LF2407A |
| CN201780335U (en) * | 2010-01-04 | 2011-03-30 | 广东电网公司广州供电局 | Ground resistance detecting device of overhead transmission line pole tower |
| CN102680798A (en) * | 2012-02-28 | 2012-09-19 | 山东建筑大学 | Online measurement method and device for grounding resistor of rod tower |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931792A (en) * | 2015-06-23 | 2015-09-23 | 中山市木易万用仪器仪表有限公司 | Clamp-shaped insulation resistance test device |
| CN105445560A (en) * | 2015-11-26 | 2016-03-30 | 国家电网公司 | Grounding resistor tester measurement method based on ZC-8 type |
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Application publication date: 20150701 |
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