CN201876499U - Tower impact grounding resistance measuring instrument - Google Patents
Tower impact grounding resistance measuring instrument Download PDFInfo
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- CN201876499U CN201876499U CN2010201437959U CN201020143795U CN201876499U CN 201876499 U CN201876499 U CN 201876499U CN 2010201437959 U CN2010201437959 U CN 2010201437959U CN 201020143795 U CN201020143795 U CN 201020143795U CN 201876499 U CN201876499 U CN 201876499U
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Abstract
The utility model relates to a tower impact grounding resistance measuring instrument which consists of an impulse current generator (1), a high-speed data acquisition board (2), a main control panel (3), a data display part (4), a direct current (DC)/ DC convertor (5), a voltage divider, a shunt (6) and a power circuit, wherein all parts of the instrument are assembled in a portable instrument shell; and the impulse current generator (1), the high-speed data acquisition board (2) and the data display part (4) are respectively connected with the main control panel. The impulse current which is used for measurement and generated by the impulse current generator (1) is injected into the ground, the voltage component and the current component on the voltage divider and the shunt (6) are acquired by the data acquisition board (2) immediately and then are transmitted into the micro-programmed control unit (MCU) main control panel (3) for data processing and calculation, the destination data can be obtained, and the calculation result can be displayed by the display part (4). The tower impact grounding resistance measuring instrument is applicable to measuring the impact grounding resistance of a power transmission line tower.
Description
Technical field
The utility model relates to a kind of shaft tower impulse earthed resistance measuring instrument, belongs to the electrical circuitry equipment field of measuring technique.
Background technology
For working earthing and protective ground, stake resistance is meant the resistance when direct current or power current flow through.And the earthing device of electric power line pole tower mainly is to be used for lightning protection, and for lightning protection, it is bigger to measure its impulse earthed resistance parameter meaning, and impulse earthed resistance is lightning current (dash current) resistance that earthing device presents when flowing through.
The measurement and the calculating of impact stake resistance at present has following several method:
(1) on the basis of theory analysis, concrete earthing device is set up mathematics physics model, by separating partial differential equation or difference equation, thereby calculate the impulse earthed resistance of obtaining this earthing device.The shortcoming of this method is to set up the mathematics physics model difficulty, finds the solution complicated loaded down with trivial detailsly, and different earthing device has different mathematics physics model, and versatility is poor, and the result can't verify.
(2) carry out simulation test, be primarily aimed at concentrated grounding body.
(3) utilize the power frequency earthing resistance that measures to multiply by coefficient of impact, obtain impulse earthed resistance.
(4) rule of thumb formula is estimated.
Though it is simple and convenient that the two kinds of methods in back are calculated, its shortcoming is that accuracy is low, can only be used for estimation.And above-mentioned several method is except second method, and all the other are not directly to measure the result by experiment, all are to utilize indirect means to obtain impulse earthed resistance, and its result's reliability remains to be proved to be improved.
The impulse earthed resistance surveying instrument of part colleges and universities and scientific research institutions design at present, the dash current amplitude that produces is mostly below 5A, signal to noise ratio (S/N ratio) is not high, measuring accuracy is not high, and incident current waveforms amplitude and steepness all differ greatly with lightning current, can't simulate the ground connection situation of grounded screen under the lightning current effect, mainly, still not possess the condition that engineering is applied as experimental study.
Summary of the invention
The purpose of this utility model is, a portable impulse current generator is provided, inject dash current to earthing device, realization is measured the impulse earthed resistance of shaft tower, the steepness of injection current and amplitude are all much larger than other like products (the dash current amplitude reaches as high as 10A), the signal to noise ratio (S/N ratio) height, the measuring accuracy height.
The technical scheme that the utility model is realized is: produce dash current by a portable impulse current generator and inject grounded screen, the impulse earthed resistance of the earth mat that achieves a butt joint is measured.Utilize such injection current, obtain voltage responsive under the lightning current waveform effect that earthing device is steep at wave head, amplitude is bigger, thereby obtain the impulse earthed resistance of earthing device by the Fourier transform computing method.
The utility model shaft tower impulse earthed resistance measuring instrument is made up of with shunt 6 and power circuit impulse current generator 1, high-speed data acquisition plate 2, MCU master control board 3, data presentation parts 4, DC/DC transducer 5, voltage divider, all parts of instrument all are assembled in the portable tool housing, and impulse current generator 1, high-speed data acquisition plate 2, data presentation parts 4 link with the MCU master control board respectively; The DC/DC transducer is supplied with each component circuitry with the DC voltage that supply voltage is transformed into different sizes, and instrument panel is provided with binding post, is used for being connected with voltage pole, the electric current utmost point, the earthing pole that the shaft tower impulse earthed resistance is measured respectively.During instrument work, produce a measuring dash current by impulse current generator 1 and inject the earth, by voltage, the current component of high-speed data acquisition plate 2 instantaneous acquirings on voltage divider and the shunt 6, and be sent to MCU master control board 3, carry out data processing, calculating, obtain destination data, by data presentation device 4 result of calculation is shown at last.
Because portable impulse current generator capacity is very limited, can't produce the high amplitude current source of high frequency of similar lightning current, the utility model carries out analog-converted by the software for calculation of instrument internal, the injection current of low steepness low amplitude value is converted to the standard lightning impulse (1.2/50 μ s) of the high amplitude of high frequency, try to achieve the response of earth mat under this shock wave effect by mathematic(al) manipulation, and show.Compare other same quasi-instruments, more the fit theoretical definition of impulse earthed resistance of the result who records more can characterize the ground connection situation of earth mat under the lightning wave effect.
When using, measures the utility model, as shown in Figure 2 by traditional three electrode method wiring.During measurement, by the switch on the instrument panel, control novel shaft tower impulse earthed resistance measuring instrument and produce a dash current injection earthing device E, data collector synchronous acquisition in the measuring instrument is injected the impulse current waveform of earth mat and the voltage waveform of voltage pole P, and is connected with this measuring instrument backstage by communicator.Calculate through measuring instrument backstage software for calculation, the voltage responsive under the lightning current waveform effect that this earthing device is steep at wave head, amplitude is bigger is obtained in conversion.At last by the equivalent voltage that obtains, current peak, according to the engineering definition formula
Obtain the impulse earthed resistance of this earthing device.
In the measurement, after the MCU master control board was received and measured instruction, the charge circuit of controlling impulse current generator according to the charging voltage default value charged to capacitor.Disconnect charge circuit after charging is finished, trigger discharge loop then and produce dash current injection earthing device; Measure portion work simultaneously, record are passed through shunt and voltage divider and are penetrated with the current-voltage waveform after following the tracks of, and sampling result is stored in the raw data district.After sampling was finished, the MCU master control board was carried out smothing filtering to the data that collect, and is incorporated into capable convolution algorithm with standard lightning current waveform then, obtains the voltage responsive of grounding body under the effect of standard lightning current; The maximal value of this response voltage is found out, divided by standard lightning current maximal value, promptly got shaft tower impulse earthed resistance value, the impulse earthed resistance value that draws send LCD to show.If current waveform data or voltage waveform data overrange or too little that sampling obtains are unfavorable for obtaining sufficiently high measuring accuracy, then regulate charging voltage automatically, to obtain the highest resistance measurement precision.
The utility model beneficial effect compared with the prior art is:
(1) measure conveniently: the utility model installation weight is light, volume is little, makes things convenient for the staff to be carried into the field and carries out field survey.
(2) measure accurately: it is higher relatively that the utility model injects the dash current amplitude of grounded screen, avoided in the ground stray current to the influence of measurement result, and accuracy height, antijamming capability are strong.
(3) the utility model more can react earth mat impulse earthed resistance situation under the lightning impulse current effect, to low frequency injection current by a narrow margin, obtain voltage responsive under the lightning current waveform effect that earthing device is steep at wave head, amplitude is bigger by the Fourier transform computing method.
The utility model is applicable to the impulse earthed resistance of measuring electric power line pole tower.
Description of drawings
Fig. 1 is the utility model shaft tower impulse earthed resistance measuring instrument block diagram
Fig. 2 is that present embodiment shaft tower impulse earthed resistance measuring instrument uses elementary diagram
Picture in picture number and letter representation: (1) impulse current generator; (2) high-speed data acquisition plate; (3) MCU master control board; (4) data presentation parts; A, b, c, d: instrument wiring knob; E: earthing device; P: voltage pole; C: the electric current utmost point; The distance of P, C to E is by related standard requirements.
Embodiment
The utility model embodiment shaft tower impulse earthed resistance measuring instrument is made up of with shunt 6 and power circuit impulse current generator 1, high-speed data acquisition plate 2, MCU master control board 3, data presentation parts 4, DC/DC transducer 5, voltage divider.All parts of instrument all are assembled in the portable tool housing, and impulse current generator 1, high-speed data acquisition plate 2, data presentation parts 4 link with the MCU master control board respectively.The highest amplitude of dash current that present embodiment produces can reach 10A, and the maximum voltage amplitude can reach 1000V.The wave head time of dash current is 1 μ s.Its data collector is the analog acquisition device, and sampling rate is 50MS/s.
Fig. 2 is that present embodiment shaft tower impulse earthed resistance measuring instrument uses elementary diagram, four binding post a, b, c, d are arranged on the dashboard face, wherein, a connects that voltage pole P, c meet electric current utmost point C, b and d receives grounded screen E, this is because when physical cabling, connecting line from instrument to grounded screen E may be long, and taking this mode of connection mainly is for the impedance of removing this section line itself influence to measurement result.
When present embodiment is measured pole tower ground resistance, should determine that shaft tower and grounded screen disconnect fully, it uses step as follows:
(1) disconnects being connected of tested shaft tower body of the tower and grounded screen fully;
(2) connect up according to three electrode method, and consider that instrument is long because of the influence of impedance to measurement result own to the connecting line of grounded screen E, b, the d of instrument are connected with E with earthing device, and a meets voltage pole P, c and meets electric current utmost point C, will confirm that before wiring instrument is in off-mode;
(3) start after the self check, is measured by " measurement " key;
(4) read measured value;
(5) read test data automatically three times, show mean value.
Claims (2)
1. shaft tower impulse earthed resistance measuring instrument, it is characterized in that, described resistance measuring instrument is made up of with shunt (6) and power circuit impulse current generator (1), high-speed data acquisition plate (2), MCU master control board (3), data presentation parts (4), DC/DC transducer (5), voltage divider, all parts of instrument all are assembled in the portable tool housing, and impulse current generator (1), high-speed data acquisition plate (2), data presentation parts (4) link with the MCU master control board respectively; Instrument panel is provided with binding post, is used for being connected with voltage pole, the electric current utmost point, the earthing pole that the shaft tower impulse earthed resistance is measured respectively.
2. shaft tower impulse earthed resistance measuring instrument according to claim 1, it is characterized in that, described impulse current generator (1) produces a measuring dash current and injects the earth, by voltage, the current component of high-speed data acquisition plate (2) instantaneous acquiring on voltage divider and the shunt (6), and be sent to MCU master control board (3), carry out data processing, calculating, obtain destination data, result of calculation is shown by data presentation parts (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201437959U CN201876499U (en) | 2010-03-29 | 2010-03-29 | Tower impact grounding resistance measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201437959U CN201876499U (en) | 2010-03-29 | 2010-03-29 | Tower impact grounding resistance measuring instrument |
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| CN201876499U true CN201876499U (en) | 2011-06-22 |
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| CN2010201437959U Expired - Fee Related CN201876499U (en) | 2010-03-29 | 2010-03-29 | Tower impact grounding resistance measuring instrument |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998603A (en) * | 2012-12-12 | 2013-03-27 | 重庆大学 | Device and method for measuring impact current divergence characteristics of earth electrode |
| CN103675462A (en) * | 2013-12-17 | 2014-03-26 | 厦门红相电力设备股份有限公司 | Small-current lightning impulse grounding impedance testing method and device |
| CN104749443A (en) * | 2013-12-31 | 2015-07-01 | 孙巍巍 | Measuring device for grounding resistance |
| CN105116230A (en) * | 2015-08-20 | 2015-12-02 | 云南电网有限责任公司电力科学研究院 | Method using multi-frequency combination to measure impulse grounding resistance of grounding device |
| CN106199202A (en) * | 2015-05-05 | 2016-12-07 | 国家电网公司 | A kind of line steel tower grounded screen Transient grounding resistance measuring instrument |
| CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
-
2010
- 2010-03-29 CN CN2010201437959U patent/CN201876499U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998603A (en) * | 2012-12-12 | 2013-03-27 | 重庆大学 | Device and method for measuring impact current divergence characteristics of earth electrode |
| CN103675462A (en) * | 2013-12-17 | 2014-03-26 | 厦门红相电力设备股份有限公司 | Small-current lightning impulse grounding impedance testing method and device |
| CN103675462B (en) * | 2013-12-17 | 2016-05-04 | 厦门红相电力设备股份有限公司 | Little electric current lightning impulse earth loop impedance test method and device thereof |
| CN104749443A (en) * | 2013-12-31 | 2015-07-01 | 孙巍巍 | Measuring device for grounding resistance |
| CN106199202A (en) * | 2015-05-05 | 2016-12-07 | 国家电网公司 | A kind of line steel tower grounded screen Transient grounding resistance measuring instrument |
| CN105116230A (en) * | 2015-08-20 | 2015-12-02 | 云南电网有限责任公司电力科学研究院 | Method using multi-frequency combination to measure impulse grounding resistance of grounding device |
| CN105116230B (en) * | 2015-08-20 | 2017-10-24 | 云南电网有限责任公司电力科学研究院 | A kind of method of use multi-frequency measurement in a closed series earthing or grounding means impulse earthed resistance |
| CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121212 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121212 Address after: 330000 No. 88 min Qiang Road, private science and Technology Park, Jiangxi, Nanchang Patentee after: Jiangxi Electric Power Science Academy Patentee after: State Grid Corporation of China Address before: 330000 No. 88 min Qiang Road, private science and Technology Park, Jiangxi, Nanchang Patentee before: Jiangxi Electric Power Science Academy |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20180329 |