CN102967767A - High-precision low-power-consumption grounding resistance testing device - Google Patents
High-precision low-power-consumption grounding resistance testing device Download PDFInfo
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- CN102967767A CN102967767A CN201210497631XA CN201210497631A CN102967767A CN 102967767 A CN102967767 A CN 102967767A CN 201210497631X A CN201210497631X A CN 201210497631XA CN 201210497631 A CN201210497631 A CN 201210497631A CN 102967767 A CN102967767 A CN 102967767A
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- 238000010586 diagram Methods 0.000 description 7
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- 238000006243 chemical reaction Methods 0.000 description 4
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Abstract
The invention discloses a high-precision low-power-consumption grounding resistance testing device which comprises a carframe and a measuring instrument box, wherein the measuring instrument box is fixed in the middle of the carframe, a saddle and a handlebar are arranged on the carframe, the front end of the carframe is provided with a front wheel, the rear end of the carframe is provided with a rear wheel and a first flywheel sprocket which are coaxially arranged, a first driving sprocket and a second driving sprocket which are coaxially arranged are arranged in the middle of the carframe, and the first driving sprocket and the first flywheel sprocket are connected through a first chain; a grounding resistance measuring instrument is arranged in the measuring instrument box, the side wall of the measuring instrument box is provided with a chain port, a rotating shaft of a generator of the measuring instrument box is provided with a second flywheel sprocket, the second driving sprocket and the second flywheel sprocket are connected through a second chain, and the second chain passes through the chain port; and a shaft of the first driving sprocket and the second driving sprocket is provided with a pedal, and the pedal is provided with a strap. The testing device disclosed by the invention is suitable for walking between measuring points in a short distance, and applicable to wild environments with complex terrains, and facilitates the field operations of measurers; and in the process of measuring, the physical exhaustion is reduced, therefore, the testing device is practical, convenient and quick.
Description
Technical field
The present invention relates to the power system measuring device, specifically a kind of high-precision low-power consumption earth resistance device.
Background technology
Earth resistance tester is the Common Instrument of checking measurements stake resistance, also is electrical safety inspection and the indispensable instrument of earth work final acceptance of construction.Because how in the open air the earth resistance tester place to use, distant between each measurement point, survey crew need to carry instrument and hurry back and forth between each measurement point, and open-air location is complicated, is not suitable for the vehicles such as automobile and uses; During measurement, need manually to shake fast the alternator shaft of earth resistance tester, physical demands is larger, uses inconvenient.
Summary of the invention
In order to address the above problem, the invention provides a kind of high-precision low-power consumption earth resistance device.
The present invention for achieving the above object, be achieved through the following technical solutions: a kind of high-precision low-power consumption earth resistance device, comprise vehicle frame and measuring instrument casing, the measuring instrument casing is fixed on the vehicle frame middle part, vehicle seat and handlebar are installed on the vehicle frame, and the vehicle frame front end is installed front-wheel, and coaxial trailing wheel and the first freewheel sprockets are installed in the vehicle frame rear end, central frame beam is installed coaxial the first drive sprocket and the second drive sprocket, the first drive sprocket be connected freewheel sprockets and connect by the first chain; Ground resistance measuring instrument is installed in the measuring instrument casing, offer the chain Tiaokou on the measuring instrument wall box, the second freewheel sprockets is installed on the alternator shaft of ground resistance measuring instrument, the second drive sprocket be connected freewheel sprockets and connect by the second chain, the second chain is by the chain Tiaokou; On the axle of the first drive sprocket and the second drive sprocket pedal is installed, band is installed on the pedal.
In order further to realize purpose of the present invention, can also be by the following technical solutions: on the vehicle frame at described measuring instrument casing top support set is installed, support set upper end operator's console, rotary knob rod is set in the support set, the rotary knob rod lower end is connected with the lower knob of ground resistance measuring instrument, the rotary knob rod upper end arranges upper knob, display screen is installed on the operator's console, the camera of mounting strap illuminating lamp in the measuring instrument casing, the camera lens of camera aligns with the ground resistance measuring instrument panel board, and camera is connected by wire with display screen.
The invention has the advantages that: when walking between each measurement point, directly forward can be walked to pedal, the present invention is particularly suitable for the walking between the measurement point between the short distance, simultaneously, can be applicable to the field environment of complex-terrain, be convenient for measuring personnel's operation in the open air; During measurement, the back-pedal pedal can shake the alternator shaft of earth resistance tester fast, and physical demands reduces, and is applicable convenient and swift, and Measuring Time reduces, the measurement of every day can increase by 50%.The present invention also has compactness simple for structure, the advantage such as cheap for manufacturing cost and easy to use.
Description of drawings
Fig. 1 is structural representation of the present invention; Fig. 2 is the right TV structure synoptic diagram of Fig. 1; Fig. 3 is the left TV structure synoptic diagram of Fig. 1; Fig. 4 is that the A of Fig. 1 is to the TV structure synoptic diagram; Fig. 5 is control system MCU control circuit figure; Fig. 6 is the signal generator module circuit diagram; Fig. 7 is A/D conversion module circuit diagram; Fig. 8 is that the multi-way switch in the potential circuit module is selected module physical circuit figure; Fig. 9 is that multi-way switch is selected module circuit diagram in the current circuit module; Figure 10 control system control chart.
Reference numeral: 1 ground resistance measuring instrument, 2 lower knobs, 3 front-wheels, 4 display screens, 5 handlebars, 6 operator's console, 7 upper knobs, 8 support sets, 9 parcel trays, 10 vehicle seats, 11 vehicle frames, 12 first drive sprockets, 13 first chains, 14 trailing wheels, 15 pedals, 16 bands, 17 second chains, 18 chain Tiaokous, 19 second freewheel sprockets, 20 rotary knob rods, 21 cameras, 22 measuring instrument casings, 23 connection jaws, 24 first freewheel sprockets, 25 second drive sprockets.
Embodiment
A kind of high-precision low-power consumption earth resistance device, such as Fig. 1, Fig. 2 and shown in Figure 3, comprise vehicle frame 11 and measuring instrument casing 22, measuring instrument casing 22 is fixed on vehicle frame 11 middle parts, vehicle seat 10 and handlebar 5 are installed on the vehicle frame 11, and vehicle frame 11 front ends are installed front-wheel 3, and coaxial trailing wheel 14 and the first freewheel sprockets 24 are installed in vehicle frame 11 rear ends, the first coaxial drive sprocket 12 and the second drive sprocket 25, the first drive sprockets 12 are installed in the middle of the vehicle frame 11 and are connected freewheel sprockets 24 by 13 connections of the first chain; Measuring instrument casing 22 interior installation ground resistance measuring instruments 1, offer chain Tiaokou 18 on measuring instrument casing 22 sidewalls, the second freewheel sprockets 19 is installed on the alternator shaft of ground resistance measuring instrument 1, the second drive sprocket 25 be connected freewheel sprockets 19 and connect by the second chain 17, the second chain 17 is by chain Tiaokou 18; The structure of the first freewheel sprockets 24 and the second freewheel sprockets 19 is identical with bicycle freewheel, and pedal 15 is installed on the axle of the first drive sprocket 12 and the second drive sprocket 25, and band 16 is installed on the pedal 15.When between each measurement point, walking, with identical by bike, only need forward to pedal, direction as shown in Figure 1, the present invention is mobile to the right, the second freewheel sprockets 19 can drive earth resistance tester 1 when being rotated counterclockwise alternator shaft rotates, and this moment, earth resistance tester 1 was in off position; After arriving measurement point, connect the line, pin is inserted in the band 16 back-pedal pedal 15, the second drive sprocket 25 rotates, and the second freewheel sprockets 19 is rotated under the drive of the second chain 17, earth resistance tester 1 work, at this moment, conveniently finish measurement, physical demands is low.
For convenient the adjusting and record data in the measuring process, as shown in Figure 1, support set 8 is installed on the vehicle frame 11 at described measuring instrument casing 22 tops, support set 8 upper end operator's console 6, the support set 8 interior rotary knob rods 20 that arrange, rotary knob rod 20 lower ends are connected with the lower knob 2 of ground resistance measuring instrument 1, as shown in Figure 4, rotary knob rod 20 upper ends arrange upper knob 7, display screen 4 is installed on the operator's console 6, the camera 21 of measuring instrument casing 22 interior mounting strap illuminating lamps, the camera lens of camera 21 aligns with ground resistance measuring instrument 1 panel board, and camera 21 and display screen 4 are connected by wire.Drive rotary knob rod 20 by rotating upper knob 7, rotary knob rod 20 drives lower knob 2 and rotates, and the adjusting of the earth resistance measuring instrument 1 that achieves a butt joint by the information that the camera 21 of reality in the display screen 4 is collected, is carried out record to data.During measurement, survey crew keeps lifting torso up erect, and work posture is comfortable, and delay fatigue increases work efficiency.Parcel tray 9 is installed on the described vehicle frame 11.
In order to make things convenient for carrying of other survey instruments, as shown in Figure 1, parcel tray 9 is installed on the described vehicle frame 11.Can be placed in the parcel tray 9 with instruments such as wire, drill rod, hammers measuring, easy to carry.
Described ground resistance measuring instrument 1 detachable rear separately use, concrete structure is: comprise power circuit, voltage generating circuit, electric current retaking of a year or grade circuit, control system MCU control circuit, startup self-detection circuit, measurement module, wireless transport module and power supply device.Control system MCU control circuit physical circuit figure as shown in Figure 5, the potential circuit module selects module, output power driver module to form by signal generator module, amplifying circuit module, multi-way switch.Signal generator module physical circuit figure as shown in Figure 6, multi-way switch in the potential circuit module is selected the module physical circuit as shown in Figure 8.The current circuit module selects module, Power arithmetic amplification module, filter circuit module, envelope detecting circuit, A/D conversion module to form by multi-way switch.A/D conversion module physical circuit figure as shown in Figure 7.Multi-way switch is selected module circuit diagram as shown in Figure 9 in the current circuit module.That control system MCU adopts is 16 single-chip microcomputer MSP430 of super low-power consumption.
When single-chip microcomputer MSP430 enters low-power consumption mode, 1 μ A is only arranged; We adopt the A/D conversion chip is the ADS7822 of 12 high-precision low-power consumptions, and power-down mode only is 3 μ A; The low-power consumption that can be grounded resistance is measured.Signal generating module adopts chip AD9850, and this chip signal output is sine-wave current signal, through outer meeting resistance current signal is converted to voltage signal.Multi-way switch selects module to adjust the output voltage of signal generating module by the outer meeting resistance resistance of the control break AD9850 of control system MCU, can realize 0.4V, 0.8V, three kinds of Voltage-outputs of 1.6V.Multi-way switch in the current module selects module also can select different amplification by the control of control system MCU, can realize 4.4,13.2,33, the amplification of 66 4 kind of enlargement factor, for the retaking of a year or grade current signal that varies in size, enlargement factor by Circuit tuning, so that the input signal of AD module is more suitable value, thereby improve measuring accuracy.Measurement module comprises pincerlike voltage transformer (VT) (being called for short PT) and split core type current transformer (being called for short CT), pincerlike voltage transformer pt connects the sinusoidal signal of potential circuit output, and sinusoidal voltage is induced to measured resistance, split core type current transformer CT output signal is to current circuit.Wireless transport module can realize that the long distance wireless of data sends and the order reception, is grounded the remote measurement of resistance.
As shown in figure 10, the job step of ground resistance measuring instrument 1 circuit is: at first, the AD9850 signal generating module is sent sine voltage signal, by pincerlike voltage transformer pt sinusoidal voltage is induced to measured resistance, on the measured resistance with the generation current signal, by split core type current transformer CT, current value is measured, and by amplifying element signal is amplified, by filtering link filtering clutter, by the envelope detecting circuit alternating current is converted to direct current, and by the AD modular converter signal is delivered to the MCU unit, realize current measurement, the ratio of calculating voltage and electric current draws the stake resistance resistance again.Stake resistance resistance data can be by the long-range central computer that is sent to of GPRS wireless sending module, and central computer also can by the GPRS module to the long-range transmission measuring command of earth resistance tester, be grounded the remote measurement of resistance simultaneously.
The high-acruracy survey scheme of ground resistance measuring instrument 1 circuit is: at first selecting module to adjust its output voltage by multi-way switch is minimum output voltage 0.4V, by pincerlike voltage transformer pt sinusoidal voltage is induced to measured resistance, electric current retaking of a year or grade circuit retaking of a year or grade electric current again, and judge that whether current value is greater than 5mA, and less than 100mA, to guarantee the output linearity degree of mutual inductor.If greater than 100mA, can judge that then resistance is 0, if less than 5mA, then adjust multi-way switch and select module, and whether rejudge current value greater than 5mA, and less than 100mA.When occurring greater than 5mA in the measured resistance and during less than the electric current of 100mA, CT measures current value by split core type current transformer, and by multi-way switch select the adjustable amplifying element of module controls enlargement factor with signal amplify, by filtering link filtering clutter, by the envelope detecting circuit alternating current is converted to direct current, and by the AD modular converter signal is delivered to the MCU unit.Judge that the AD value whether between 500 to 2000, if be lower than 500, then heightens current amplification factor, if be higher than 2000, then turn down current amplification factor, thereby improve measuring accuracy.
True, reliable for guaranteeing that monitor sends to the stake resistance data of monitoring center, the temperature of eliminating circuit float and environmental change on the impact of measurement result precision, need in monitor, add selftest module, the resistance that the resistance that seals in is known in PT and CT.When tester is started shooting at every turn, at first measure known resistance, then can be with this value as benchmark, by the detected current value that comes of resistance and reference value comparison, float with regard to the temperature of eliminating circuit like this and the impact of environmental change.Specific practice is: the resistance with 4 resistances is done self check, forms 3 linearity ranges, can calculate the numerical value that A/D converts with the linear difference method when normal the measurement, thereby obtain accurately current value.
The advantage of described ground resistance measuring instrument 1 is: 1, measuring accuracy is high; 2, adopt wireless transport module, highly reliable, data transmission cheaply is provided, the variation of acquisition side joint shaft tower zone stake resistance that can not timing; 3, whole system low-power consumption, volume is little, lightweight, reliability is high, failure rate is low; 4, the automaticity of whole device is high, need not manual maintenance, has improved greatly the efficient of engineering maintenance and measurement.
Technical scheme of the present invention is not restricted in the scope of embodiment of the present invention.The present invention not technology contents of detailed description is known technology.
Claims (3)
1. high-precision low-power consumption earth resistance device, it is characterized in that: comprise vehicle frame (11) and measuring instrument casing (22), measuring instrument casing (22) is fixed on vehicle frame (11) middle part, upper vehicle seat (10) and the handlebar (5) installed of vehicle frame (11), vehicle frame (11) front end is installed front-wheel (3), coaxial trailing wheel (14) and the first freewheel sprockets (24) are installed in vehicle frame (11) rear end, coaxial the first drive sprocket (12) and the second drive sprocket (25) are installed in the middle of the vehicle frame (11), and the first drive sprocket (12) and the freewheel sprockets (24) of being connected are passed through the first chain (13) connection; Ground resistance measuring instrument (1) is installed in the measuring instrument casing (22), offer chain Tiaokou (18) on measuring instrument casing (22) sidewall, the second freewheel sprockets (19) is installed on the alternator shaft of ground resistance measuring instrument (1), the second drive sprocket (25) be connected freewheel sprockets (19) and connect by the second chain (17), the second chain (17) is by chain Tiaokou (18); Pedal (15) is installed, the upper band (16) of installing of pedal (15) on the axle of the first drive sprocket (12) and the second drive sprocket (25).
2. a kind of high-precision low-power consumption earth resistance device according to claim 1, it is characterized in that: the upper support set (8) of installing of the vehicle frame (11) at described measuring instrument casing (22) top, support set (8) upper end operator's console (6), rotary knob rod (20) is set in the support set (8), rotary knob rod (20) lower end is connected with the lower knob (2) of ground resistance measuring instrument (1), rotary knob rod (20) upper end arranges upper knob (7), the upper display screen (4) of installing of operator's console (6), the camera (21) of the interior mounting strap illuminating lamp of measuring instrument casing (22), the camera lens of camera (21) aligns with ground resistance measuring instrument (1) panel board, and camera (21) is connected by wire with display screen (4).
3. a kind of high-precision low-power consumption earth resistance device according to claim 1 is characterized in that: the upper parcel tray (9) of installing of described vehicle frame (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210497631.XA CN102967767B (en) | 2012-11-29 | 2012-11-29 | High-precision low-power-consumption grounding resistance testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210497631.XA CN102967767B (en) | 2012-11-29 | 2012-11-29 | High-precision low-power-consumption grounding resistance testing device |
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| CN102967767A true CN102967767A (en) | 2013-03-13 |
| CN102967767B CN102967767B (en) | 2014-09-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977472A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Clip-on grounding resistor device |
| CN108627703A (en) * | 2018-07-30 | 2018-10-09 | 国网辽宁省电力有限公司铁岭供电公司 | A kind of tower bar grounding resistance monitoring device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131347A (en) * | 2000-10-24 | 2002-05-09 | Nippon Telegraph & Telephone East Corp | Grounding resistance measurement device and its method |
| CN101216515A (en) * | 2007-12-27 | 2008-07-09 | 武汉华瑞防雷科技股份有限公司 | Powerline pole tower ground resistance measurement method and its tester |
| CN203101518U (en) * | 2012-11-29 | 2013-07-31 | 山东电力集团公司检修公司 | High-precision low-power-consumption grounding resistance testing device |
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2012
- 2012-11-29 CN CN201210497631.XA patent/CN102967767B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131347A (en) * | 2000-10-24 | 2002-05-09 | Nippon Telegraph & Telephone East Corp | Grounding resistance measurement device and its method |
| CN101216515A (en) * | 2007-12-27 | 2008-07-09 | 武汉华瑞防雷科技股份有限公司 | Powerline pole tower ground resistance measurement method and its tester |
| CN203101518U (en) * | 2012-11-29 | 2013-07-31 | 山东电力集团公司检修公司 | High-precision low-power-consumption grounding resistance testing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977472A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Clip-on grounding resistor device |
| CN108627703A (en) * | 2018-07-30 | 2018-10-09 | 国网辽宁省电力有限公司铁岭供电公司 | A kind of tower bar grounding resistance monitoring device |
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| CN102967767B (en) | 2014-09-03 |
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