CN104181398A - Ground resistance testing device and method - Google Patents
Ground resistance testing device and method Download PDFInfo
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- CN104181398A CN104181398A CN201410452884.4A CN201410452884A CN104181398A CN 104181398 A CN104181398 A CN 104181398A CN 201410452884 A CN201410452884 A CN 201410452884A CN 104181398 A CN104181398 A CN 104181398A
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Abstract
The invention provides a ground resistance testing device and method. The method comprises the steps that a voltage electrode, a current electrode and a lead are arranged according to a three electrode method; the frequency far from the power frequency is adopted as measuring current frequency; a constant measuring current is adopted, and different constant current tap positions are selected to conduct measurement; at a first measuring time point, a detection voltage of the voltage electrode containing an interference voltage is measured, and the detection voltage at the measuring current frequency is extracted through FFT; at a second measuring time point, an interference voltage of the voltage electrode is measured, and the interference voltage at the measuring current frequency is extracted through FFT; the interference voltage at the measuring current frequency is subtracted from the detection voltage at the measuring current frequency to obtain an actual interference-free measuring voltage, and the actual measuring voltage is divided by the constant measuring current to obtain a ground resistance value. By the adoption of the ground resistance testing device and method, all interference frequencies can be filtered out effectively, an accurate ground resistance measuring result can be obtained, and the effects of high testing speed, stable testing data and accurate testing result are achieved.
Description
Technical field
The present invention relates to test the technical field of stake resistance, relate in particular to a kind of proving installation and method of stake resistance.
Background technology
To the test of stake resistance, be that earth work final acceptance of construction and electrical safety check indispensable step.
Grounding resistance is validity, the security of confirming earthed system and identifies whether earthed system meets the important parameter of designing requirement.If imperfect earth gently causes electric equipment to damage in the time being struck by lightning, heavy may lose protection personal safety effect, national wealth and people's life security is caused to serious threat.The accuracy of grounding resistance measurement, directly affects lightningproof protection, the reliability that affects electrical equipment work and personal safety protection.But, general stake resistance surrounding environment more complicated, the interfering frequency of background environment becomes increasingly complex, as has high-power reactive power compensator, near electric railway and big machinery processing plant area etc., not only power frequency interference is very strong, and power frequency interference is around also very strong, now as adopted alien frequencies method or frequency variation method etc., cannot eliminate the impact of interference, and meter reading saltus step, is difficult to read standard, cause measurement result to have very large error.Disturb in order to suppress power frequency, classic method is to adopt power frequency heavy-current method to measure.The power frequency producing when preventing operation of power networks is disturbed, and improves the accuracy of measurement result, and insulation preventive trial code specifies: the test current of power frequency heavy-current method must not be less than 30 amperes.Thus, adopt this kind of method, surveying instrument is very heavy, and current feed is very thick, and survey crew working strength is large, have Danger Electric shock risk, and instrumentation complexity, and Measuring Time is long.
Summary of the invention
The invention provides a kind of proving installation and method of stake resistance, effectively each interfering frequency of filtering, obtains the measurement result of stake resistance accurately.
For achieving the above object, the technical solution used in the present invention is:
One aspect of the present invention provides a kind of proving installation of stake resistance, is provided with earthing device, voltage pole and the electric current utmost point, is also provided with the first voltage pole wiring pile, grounded screen wiring pile, second voltage utmost point wiring pile, electric current utmost point wiring pile; Draw lead-in wire from earthing device and be connected to described the first voltage pole wiring pile and grounded screen wiring pile, described voltage pole connects second voltage utmost point wiring pile, and the described electric current utmost point connects electric current utmost point wiring pile through switch.
Further, after described switch closure, the measuring voltage utmost point detects voltage, and described detection voltage is containing interference voltage;
After described switch disconnects, measuring voltage utmost point interference voltage.
The present invention provides a kind of method of testing of the stake resistance based on described proving installation on the other hand, comprising:
Press three electrode method and arrange voltage pole, the electric current utmost point and lead-in wire;
Adopt away from the frequency of power frequency as measuring power frequency;
Adopt constant measurement electric current, select different constant current gears to measure;
At the first Measuring Time point, measure the voltage pole that comprises interference voltage and detect voltage, convert and take out the detection voltage of measuring under power frequency by FFT;
At the second Measuring Time point, measuring voltage utmost point interference voltage, is converted and is taken out the interference voltage of measuring under power frequency by FFT;
The interference voltage that detection voltage under described measurement power frequency is deducted under described measurement power frequency obtains glitch-free actual measurement voltage, and described actual measurement voltage, divided by described constant measurement electric current, is calculated to stake resistance resistance.
Further, adopt conducting and the disconnection of the switch control electric current utmost point.
The present invention adopts constant measurement electric current, and away from the fixation measuring frequency of interfering frequency, timesharing is measured voltage pole, and converts filtering interfering by FFT, finally obtains grounding resistance accurately.Adopt proving installation of the present invention and method, there is the effect that surveying instrument is light, current feed is thin, safety, instrumentation that ensure survey crew are easy, shorten Measuring Time, and test speed is fast, test data stable, test result is accurate.
Brief description of the drawings
Fig. 1 is the structural representation of the proving installation of stake resistance of the present invention;
Fig. 2 is the schematic flow sheet of the method for testing of stake resistance of the present invention.
Embodiment
Specifically illustrate embodiments of the present invention below in conjunction with accompanying drawing, accompanying drawing is only for reference and use is described, does not form the restriction to scope of patent protection of the present invention.
As shown in Figure 1, the present embodiment provides a kind of proving installation of stake resistance on the one hand, be provided with earthing device G, voltage pole P and electric current utmost point C, be also provided with the first voltage pole wiring pile P1, grounded screen wiring pile C1, P1, second voltage utmost point wiring pile P2, electric current utmost point wiring pile C2; Draw lead-in wire from earthing device G and be connected to described the first voltage pole wiring pile P1 and grounded screen wiring pile C1, P1, described voltage pole P connects second voltage utmost point wiring pile P2, and described electric current utmost point C connects electric current utmost point wiring pile C2 through K switch 1.
After described K switch 1 closure, at the first Measuring Time point T1, the measuring voltage utmost point detects voltage, and described detection voltage is containing interference voltage;
After described K switch 1 disconnects, at the second Measuring Time point T2, measuring voltage utmost point interference voltage.
As shown in Figure 2, the present embodiment provides a kind of method of testing of the stake resistance based on described proving installation on the other hand, comprising:
Press three electrode method and arrange voltage pole, the electric current utmost point and lead-in wire; Wherein adopt conducting and the disconnection of the switch control electric current utmost point;
Adopt away from the frequency of power frequency as measuring power frequency Ftest; Power frequency is the frequency of 50HZ;
Adopt constant measurement electric current I, select different constant current gears to measure;
At the first Measuring Time point T1, measure the voltage pole that comprises interference voltage and detect voltage, convert and take out the detection voltage VT1 measuring under power frequency by FFT;
At the second Measuring Time point T2, measuring voltage utmost point interference voltage, is converted and is taken out the interference voltage VT2 measuring under power frequency by FFT;
Due to Measuring Time point T1 and T2 very short interval time, can think that the test environment of T1 and T2 is the same, interference source is the same.Therefore, the interference voltage VT2 that detection voltage VT1 under described measurement power frequency is deducted under described measurement power frequency obtains glitch-free actual measurement voltage V, described actual measurement voltage V, divided by described constant measurement electric current I, is calculated to stake resistance resistance R.
In embodiments of the present invention, adopt K switch 1 to control conducting and the disconnection of electric current utmost point C.
The proving installation of the stake resistance that the present embodiment provides and the course of work of method are:
In the present embodiment, 12 AD that selected instrument uses, the highest measuring accuracy can reach 0.2 milliohm, and numerical precision is got after radix point 3.The value of gained VT1 and VT2 is after converting by FFT, at frequency 128Hz, and the actual value of testing under constant current 0.1A;
(1) instrument test electrode G is connected to switchgear building by geodesic line, electrode P is inserted into from underground 0.3 meter of test 9 meters of of ground wire, and electrode C is inserted into from underground 0.3 meter of test 15 meters of of ground wire, and three test electrodes are arranged in a linear;
(2) instrument is selected manual measurement, and test voltage is selected in 20V gear (constant current 1A);
(3) while measurement, K1 closes, and instrument, by galvanic electrode C, is sent constant measurement electric current I 1 in the time of fixed frequency f1, measures this magnitude of voltage of detection voltage VT1(comprise interference voltage at voltage pole P);
(4) disconnect after K1, measure and detect the constant current that this voltage of voltage VT2(does not have instrument to send, just interference voltage at voltage pole P);
(5) VT1 and VT2 are carried out respectively to FFT conversion (being exactly frequency-domain analysis), take out respectively the component under instrument f1, voltage under the apparatus measures electric current of VT1-f1(frequency f 1 and interference voltage sum) and the interference voltage of VT2-f1(frequency f 1), the true measuring voltage V=(VT1-f1 of instrument)-(VT2-f1), draw and do not have noisy actual voltage value, then calculate stake resistance resistance R divided by continuous current I.
Table 1 is the concrete test data of the present embodiment:
Table 2 is that this earth resistance tester contrasts with the test result of VICIOR6412 earth resistance tester
Can find through test comparison, the earth resistance tester of the present invention's design, test speed is fast, test data is stable, test result is accurate.
Above disclosed is only preferred embodiment of the present invention, can not limit the scope of the present invention with this, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, still belongs to the scope that the present invention is contained.
Claims (4)
1. a proving installation for stake resistance, is provided with earthing device, voltage pole and the electric current utmost point, it is characterized in that: be also provided with the first voltage pole wiring pile, grounded screen wiring pile, second voltage utmost point wiring pile, electric current utmost point wiring pile; Draw lead-in wire from earthing device and be connected to described the first voltage pole wiring pile and grounded screen wiring pile, described voltage pole connects second voltage utmost point wiring pile, and the described electric current utmost point connects electric current utmost point wiring pile through switch.
2. the proving installation of stake resistance according to claim 1, is characterized in that:
After described switch closure, the measuring voltage utmost point detects voltage, and described detection voltage is containing interference voltage;
After described switch disconnects, measuring voltage utmost point interference voltage.
3. a method of testing for the stake resistance based on proving installation described in claim 1, is characterized in that, comprising:
Press three electrode method and arrange voltage pole, the electric current utmost point and lead-in wire;
Adopt away from the frequency of power frequency as measuring power frequency;
Adopt constant measurement electric current, select different constant current gears to measure;
At the first Measuring Time point, measure the voltage pole that comprises interference voltage and detect voltage, convert and take out the detection voltage of measuring under power frequency by FFT;
At the second Measuring Time point, measuring voltage utmost point interference voltage, is converted and is taken out the interference voltage of measuring under power frequency by FFT;
The interference voltage that detection voltage under described measurement power frequency is deducted under described measurement power frequency obtains glitch-free actual measurement voltage, and described actual measurement voltage, divided by described constant measurement electric current, is calculated to stake resistance resistance.
4. the method for testing of stake resistance according to claim 3, is characterized in that:
Adopt conducting and the disconnection of the switch control electric current utmost point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452884.4A CN104181398A (en) | 2014-09-05 | 2014-09-05 | Ground resistance testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452884.4A CN104181398A (en) | 2014-09-05 | 2014-09-05 | Ground resistance testing device and method |
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| CN104181398A true CN104181398A (en) | 2014-12-03 |
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| CN201410452884.4A Pending CN104181398A (en) | 2014-09-05 | 2014-09-05 | Ground resistance testing device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765432A (en) * | 2018-12-29 | 2019-05-17 | 国网山东省电力公司高唐县供电公司 | Public power distribution station ground resistance real-time monitoring system and its implementation |
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| KR100775601B1 (en) * | 2006-05-17 | 2007-11-15 | 제주대학교 산학협력단 | Measuring system for soil resistance |
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| CN102183694A (en) * | 2009-11-24 | 2011-09-14 | 弗卢克公司 | Earth ground tester with remote control |
| EP2717063A1 (en) * | 2012-10-04 | 2014-04-09 | Bender GmbH & Co. KG | Method for monitoring and measuring an insulating resistance with an interference-resistant measurement signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765432A (en) * | 2018-12-29 | 2019-05-17 | 国网山东省电力公司高唐县供电公司 | Public power distribution station ground resistance real-time monitoring system and its implementation |
| CN109765432B (en) * | 2018-12-29 | 2021-08-10 | 国网山东省电力公司高唐县供电公司 | Real-time monitoring system for ground resistance of public power distribution station area and implementation method thereof |
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Application publication date: 20141203 |