CN204044250U - A kind of multi-frequency scanning formula pole tower ground resistance measurement mechanism - Google Patents
A kind of multi-frequency scanning formula pole tower ground resistance measurement mechanism Download PDFInfo
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- CN204044250U CN204044250U CN201420247877.6U CN201420247877U CN204044250U CN 204044250 U CN204044250 U CN 204044250U CN 201420247877 U CN201420247877 U CN 201420247877U CN 204044250 U CN204044250 U CN 204044250U
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- 230000008569 process Effects 0.000 claims abstract description 10
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Abstract
A kind of multi-frequency scanning formula high pressure shaft tower earth resistance metering device, this measurement mechanism is that core is equipped with the power circuit, automatic frequency sweep driving source circuit, signal acquisition circuit, LCD MODULE, GPRS radio communication unit, the storage unit that are connected with central processing unit and forms with central processing unit; The output terminal of described automatic frequency sweep driving source circuit is connected with tower grounding downlead, and its measuring junction is connected with the input end of signal acquisition circuit, and its input end processes with central authorities and is connected; The output terminal of described signal acquisition circuit is connected with central processing unit, and is connected with GPRS radio communication unit.Measurement mechanism cloth described in the utility model is extremely simple, does not need to disconnect ground lead, improves the efficiency of grounding resistance measurement work to a great extent.Make measuring error less, measurement is convenient and more accurate.It is low that it has power attenuation, highly sensitive, easy to carry, measures the advantages such as accurate.
Description
Technical field
The utility model relates to high pressure shaft tower grounding resistance fields of measurement, is related specifically to a kind of pick-up unit utilizing high frequency automatic frequency sweep driving source to carry out high pressure pole tower ground resistance.
Background technology
At present, mainly utilize three electrode method and high-frequency method to measure to the measurement of high pressure pole tower ground resistance both at home and abroad, but all there is respective shortcoming in these two kinds of methods.Three electrode method is based on voltage, electric current principle, the measuring system be made up of grounding body G, electric current pole C, voltage pole P.During measurement, first arrange voltage pole and electric current pole, then to grounding body G Injection Current I to be measured, and the voltage U that measuring voltage extremely goes up, pass through formula: R=U/I just can obtain stake resistance.The measurement points such as three electrode method is low at soil resistivity, physical features is smooth, there is accuracy higher, steady performance, but three electrode method is measured must disconnect ground lead, shaft tower One's name is legion in reality again, if when measuring one by one every base shaft tower, considerably increase intensity of workers and Measuring Time, inefficiency.High frequency multiple process adopts the auxiliary electrode arrangement identical with three electrode method, owing to not disconnecting ground lead when measuring, if now still adopt low frequency or power frequency to measure electric current, the pole tower ground resistance value then recorded is the parallel connection value of all pole tower ground resistances, its value is far smaller than the actual grounding resistance of tested shaft tower, so now high frequency multiple process measurement pole tower ground resistance time error is larger.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of multi-frequency scanning formula pole tower ground resistance measurement mechanism for above-mentioned Problems existing, this measurement mechanism cloth is extremely simple, and do not need to disconnect ground lead, thus make measuring error less, it is accurately convenient to measure.
For achieving the above object, the utility model adopts following technical scheme:
A kind of multi-frequency scanning formula high pressure shaft tower earth resistance metering device, this measurement mechanism is that core is equipped with the power circuit, automatic frequency sweep driving source circuit, signal acquisition circuit, LCD MODULE, GPRS radio communication unit, the storage unit that are connected with central processing unit and forms with central processing unit; The output terminal of described automatic frequency sweep driving source circuit is connected with tower grounding downlead, and its measuring junction is connected with the input end of signal acquisition circuit, and its input end is connected with central processing unit; The output terminal of described signal acquisition circuit is connected with central processing unit, and is connected with GPRS radio communication unit.
Described automatic frequency sweep driving source circuit comprises waveform generator and electric voltage-controlled current source; Signal acquisition circuit comprises signal amplification circuit, signal filter circuit and RMS-DC converter circuit.
Compared with prior art, measurement mechanism cloth described in the utility model is extremely simple, does not need to disconnect ground lead, improves the efficiency of grounding resistance measurement work to a great extent.Make measuring error less, measurement is convenient and more accurate.It is low that it has power attenuation, highly sensitive, easy to carry, measures the advantages such as accurate.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is automatic frequency sweep driving source function structure chart of the present utility model;
Fig. 3 is signal acquisition module structural drawing of the present utility model;
Fig. 4 is the workflow diagram of the utility model device;
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, a kind of multi-frequency scanning formula high pressure shaft tower earth resistance metering device, the power circuit 1 that this measurement mechanism is connected with central processing unit 4 for core is equipped with central processing unit 4, automatic frequency sweep driving source circuit 2, signal acquisition circuit 3, LCD MODULE 5, GPRS radio communication unit 6, storage unit 7 form.
The output terminal of described automatic frequency sweep driving source circuit 2 is connected with tower grounding downlead, and its measuring junction is connected with the input end of signal acquisition circuit 3, and its input end is connected with central processing unit 4; The output terminal of described signal acquisition circuit 3 is connected with central processing unit 4, and is connected with GPRS radio communication unit 6.
As shown in Figure 2, described automatic frequency sweep driving source circuit 2 comprises waveform generator 21 and electric voltage-controlled current source (VCCS) 22; As shown in Figure 3, signal acquisition circuit 3 comprises signal amplification circuit 31, signal filter circuit 32 and RMS-DC converter circuit 33.
The input termination central processing unit 4 of LCD MODULE 5; GPRS radio communication unit 6 processes 4 by communication interface circuit with central authorities and is connected; Storage unit 7 is connected with central processing unit 4 to remember pole tower ground resistance value and copies; Power circuit 1 is respectively automatic frequency sweep driving source circuit 2, signal acquisition circuit 3, central processing unit 4, GPRS radio communication unit 5 are powered.
Below modules is described in detail:
A () power circuit is the basis that whole system is effectively run, and due to asystem function unit more, the supply voltage of each unit is not identical, therefore needs to carry out conversion process to the voltage of lithium battery and normally effectively runs with ensuring equipment.In automatic frequency sweep driving source circuit, the PA05 chip power supply voltage range of VCCS is 15V to 45V, the 20V lithium battery group series connection extraction ± 20V voltage that serviceable life therefore can be adopted longer.And the general supply voltage of OP37 chip is ± 15V in signal amplification circuit and signal filter circuit, therefore step-down process need be carried out with 7815 and 1915 chips and export positive and negative 15V voltage to meet the demands.Another central processing unit required voltage is 5V, and high performance LM2576-5.0 chip can be adopted to realize voltage transitions.
B (), automatic frequency sweep driving source circuit are the sources that whole device produces measuring-signal, it is made up of waveform generator and electric voltage-controlled current source.What waveform generator adopted is the AD9833 waveform generation chip that AD company produces, and produces the alien frequencies waveform required for measuring.And the waveform signal that waveform generator produces does not reach the required signal amplitude of measurement, so utilization carries out signal amplification with the electric voltage-controlled current source that PA05 chip is core, under both collaborative works, produce the pumping signal required for native system measurement.
(c), signal acquisition circuit is used for gathering and pumping signal is injected the measuring voltage after grounding body, current signal, in the measuring junction number of winning the confidence of automatic frequency sweep driving source circuit, because the signal collected is AC signal, and central processing unit can only process direct current signal, therefore need first to change AC signal into direct current signal, so need a RMS-DC converter circuit, here the AD637 chip adopting AD company to produce changes AC signal into direct current signal, and the best transition voltage of AD637 chip is 0.7-7V, the signal of automatic frequency sweep driving source circuit measuring end exports as 0.4-4V, so need the amplification of two times, utilize OP37 chip and peripheral circuit can well realize signal to amplify, so that this basis to define signal amplification circuit, owing to measuring the signal obtained, there is Hz noise etc. again, need to carry out filtering process to it, signal after signal filter circuit process can input RMS-DC converter circuit, finally obtain the manageable measuring-signal of central processing unit.
D (), central processing unit adopt the high-performance microprocessor PIC18F4420 of U.S. Microchip company, carry out the display of pole tower ground resistance value, memory and prediction by LCD MODULE and GPRS radio communication unit.
E (), LCD MODULE adopt 12864 lattice lcds to carry out the display of pole tower ground resistance value.
F (), GPRS radio communication unit adopt the MC39I module of Siemens Company, communicated with PC by communication interface circuit.
The course of work of the present utility model is: as shown in Figure 4, utilize automatic frequency sweep driving source circuit in tested high pressure shaft tower grounding body, injected the high-frequency current signal of different frequency by down conductor, measuring circuit is formed based on three electrode method cloth pole principle, measuring-signal is gathered at automatic frequency sweep driving source circuit measuring end, signal acquisition circuit is utilized to gather measuring-signal, the electric current obtained will be measured, voltage signal is through amplifying, filtering, after change-over circuit, draw the grounding resistance corresponding to each frequency, input central processing unit, the result of measurement is shown by LCD MODULE, communicated with PC by GPRS wireless communication module simultaneously.Can also storage unit be passed through, the size of pole tower ground resistance value within a period of time be carried out copy record and export.
Claims (1)
1. a multi-frequency scanning formula high pressure shaft tower earth resistance metering device, is characterized in that: the power circuit (1) that this measurement mechanism is connected with central processing unit (4) for core is equipped with central processing unit (4), automatic frequency sweep driving source circuit (2), signal acquisition circuit (3), LCD MODULE (5), GPRS radio communication unit (6), storage unit (7) form;
The output terminal of described automatic frequency sweep driving source circuit (2) is connected with tower grounding downlead, and its measuring junction is connected with the input end of signal acquisition circuit (3), and its input end processes (4) with central authorities and is connected; The output terminal of described signal acquisition circuit (3) is connected with central processing unit (4), and is connected with GPRS radio communication unit (6); Automatic frequency sweep driving source circuit (2) comprises waveform generator (21) and electric voltage-controlled current source (VCCS) (22); Signal acquisition circuit (3) comprises signal amplification circuit (31), signal filter circuit (32) and RMS-DC converter circuit (33).
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104914313A (en) * | 2015-06-10 | 2015-09-16 | 国网上海市电力公司 | Grounding grid fault diagnosis method based on sweep frequency impedance measurement |
CN105116240A (en) * | 2015-06-05 | 2015-12-02 | 国网辽宁省电力有限公司葫芦岛供电公司 | Lightning-protection current discharge channel detection method for power transmission line tower and artificial earth electrode |
CN106093589A (en) * | 2016-08-09 | 2016-11-09 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
-
2014
- 2014-05-14 CN CN201420247877.6U patent/CN204044250U/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105116240A (en) * | 2015-06-05 | 2015-12-02 | 国网辽宁省电力有限公司葫芦岛供电公司 | Lightning-protection current discharge channel detection method for power transmission line tower and artificial earth electrode |
CN104914313A (en) * | 2015-06-10 | 2015-09-16 | 国网上海市电力公司 | Grounding grid fault diagnosis method based on sweep frequency impedance measurement |
CN106093589A (en) * | 2016-08-09 | 2016-11-09 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
CN106093589B (en) * | 2016-08-09 | 2018-09-18 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
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Granted publication date: 20141224 |