CN203101518U - 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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- CN203101518U CN203101518U CN2012206434068U CN201220643406U CN203101518U CN 203101518 U CN203101518 U CN 203101518U CN 2012206434068 U CN2012206434068 U CN 2012206434068U CN 201220643406 U CN201220643406 U CN 201220643406U CN 203101518 U CN203101518 U CN 203101518U
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Abstract
The utility model discloses a high-precision low-power-consumption grounding resistance testing device. The device comprises a frame and a measuring instrument box, wherein the measuring instrument box is fixed in the middle of the frame, a saddle and a handlebar are mounted on the frame, a front wheel is mounted at a front end of the frame, a rear wheel and a first flywheel sprocket are coaxially mounted at a rear end of the frame, a first driving sprocket and a second driving sprocket are coaxially arranged in the middle of the frame, 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, a side wall of the measuring instrument box is provided with a chain port, a second flywheel sprocket is mounted on a rotating shaft of a generator of the grounding resistance measuring instrument, 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 utility model is suitable for walking between measuring points in a short distance, and applicable to wild environments with complex terrains, facilitating the field operations of measuring personnel; and in the process of measuring, the physical exhaustion is reduced, and the testing device is practical, convenient and quick.
Description
Technical field
The utility model relates to the power system measuring device, a kind of specifically 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, the distance between each measurement point is far away, and survey crew need carry instrument and hurry back and forth between each measurement point, and open-air location complexity is not suitable for vehicles uses such as automobile; During measurement, need manually to shake fast the alternator shaft of earth resistance tester, physical demands is bigger, uses inconvenient.
The utility model content
In order to address the above problem, the utility model provides a kind of high-precision low-power consumption earth resistance device.
The utility model 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 the coaxial trailing wheel and first freewheel sprockets are installed in the vehicle frame rear end, central frame beam is installed coaxial first drive sprocket and second drive sprocket, and first drive sprocket is connected by first chain with first freewheel sprockets; Ground resistance measuring instrument is installed in the measuring instrument casing, offer the chain Tiaokou on the measuring instrument wall box, second freewheel sprockets is installed on the alternator shaft of ground resistance measuring instrument, and second drive sprocket is connected by second chain with second freewheel sprockets, and second chain is by the chain Tiaokou; The axle of first drive sprocket and second drive sprocket is gone up pedal is installed, and band is installed on the pedal.
In order further to realize the purpose of this utility model, 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 is provided with 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 lead with display screen.
Advantage of the present utility model is: when walking between each measurement point, directly forward can be walked to pedal, the utility model 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 suitable for convenient and swiftly, and Measuring Time reduces, the measurement of every day can increase by 50%.The utility model also has compactness simple for structure, advantage such as cheap for manufacturing cost and easy to use.
Description of drawings
Fig. 1 is a structural representation of the present utility model; 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 an 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, 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 the coaxial trailing wheel 14 and first freewheel sprockets 24 are installed in vehicle frame 11 rear ends, coaxial first drive sprocket 12 and second drive sprocket, 25, the first drive sprockets 12 are installed in the middle of the vehicle frame 11 to be connected by first chain 13 with first freewheel sprockets 24; Ground resistance measuring instrument 1 is installed in the measuring instrument casing 22, offer chain Tiaokou 18 on measuring instrument casing 22 sidewalls, second freewheel sprockets 19 is installed on the alternator shaft of ground resistance measuring instrument 1, second drive sprocket 25 is connected by second chain 17 with second freewheel sprockets 19, and second chain 17 is by chain Tiaokou 18; The structure of first freewheel sprockets 24 and second freewheel sprockets 19 is identical with bicycle freewheel, and the axle of first drive sprocket 12 and second drive sprocket 25 is gone up pedal 15 is installed, 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 utility model moves to the right, 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, second drive sprocket 25 rotates, and second freewheel sprockets 19 is rotated under the drive of 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, rotary knob rod 20 is set in the support set 8, 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 are provided with upper knob 7, display screen 4 is installed on the operator's console 6, the camera 21 of mounting strap illuminating lamps in the measuring instrument casing 22, 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 lead.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.
Carrying of other survey instruments as shown in Figure 1, installed parcel tray 9 on the described vehicle frame 11 for convenience.Can be placed in the parcel tray 9 with instruments such as lead, drill rod, hammers measuring, easy to carry.
Use separately described ground resistance measuring instrument 1 detachable back, 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, filtering 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 a 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 voltages 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, by adjusting the enlargement factor of circuit, make the input signal of AD module be 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, to produce current signal on the measured resistance, by split core type current transformer CT, current value is measured, and signal is amplified by amplifying element, by filtering link filtering clutter, by the envelope detecting circuit alternating current is converted to direct current, and signal is delivered to the MCU unit, realize current measurement by the AD modular converter, 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 be grounded the remote measurement of resistance by the GPRS module to the long-range transmission measuring command of earth resistance tester 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 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 signal is delivered to the MCU unit by the AD modular converter.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 to the influence 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 detected current value that comes of resistance and reference value comparison, float with regard to the temperature of eliminating circuit like this and the influence 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 changes out with the linear difference method when normal the measurement, thereby obtain the exact current value.
The advantage of described ground resistance measuring instrument 1 is: 1, measuring accuracy height; 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, total system low-power consumption, volume is little, in light weight, reliability is high, failure rate is low; 4, the automaticity height of whole device need not manual maintenance, has improved the efficient of engineering maintenance and measurement greatly.
The technical solution of the utility model is not restricted in the scope of embodiment described in the utility model.The utility model 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, vehicle frame (11) is gone up vehicle seat (10) and handlebar (5) is installed, vehicle frame (11) front end is installed front-wheel (3), coaxial trailing wheel (14) and first freewheel sprockets (24) are installed in vehicle frame (11) rear end, coaxial first drive sprocket (12) and second drive sprocket (25) are installed in the middle of the vehicle frame (11), and first drive sprocket (12) is connected by first chain (13) with first freewheel sprockets (24); Ground resistance measuring instrument (1) is installed in the measuring instrument casing (22), offer chain Tiaokou (18) on measuring instrument casing (22) sidewall, second freewheel sprockets (19) is installed on the alternator shaft of ground resistance measuring instrument (1), second drive sprocket (25) is connected by second chain (17) with second freewheel sprockets (19), and second chain (17) is by chain Tiaokou (18); The axle of first drive sprocket (12) and second drive sprocket (25) is gone up pedal (15) is installed, and pedal (15) is gone up band (16) is installed.
2. a kind of high-precision low-power consumption earth resistance device according to claim 1, it is characterized in that: the vehicle frame (11) at described measuring instrument casing (22) top is gone up support set (8) is installed, 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 is provided with upper knob (7), operator's console (6) is gone up display screen (4) is installed, 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 lead with display screen (4).
3. a kind of high-precision low-power consumption earth resistance device according to claim 1 is characterized in that: described vehicle frame (11) is gone up parcel tray (9) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206434068U CN203101518U (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 |
|---|---|---|---|
| CN2012206434068U CN203101518U (en) | 2012-11-29 | 2012-11-29 | High-precision low-power-consumption grounding resistance testing device |
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| Publication Number | Publication Date |
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| CN203101518U true CN203101518U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012206434068U Expired - Fee Related CN203101518U (en) | 2012-11-29 | 2012-11-29 | High-precision low-power-consumption grounding resistance testing device |
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| CN (1) | CN203101518U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967767A (en) * | 2012-11-29 | 2013-03-13 | 山东电力集团公司检修公司 | High-precision low-power-consumption grounding resistance testing device |
| CN106025664A (en) * | 2016-06-27 | 2016-10-12 | 国网山东省电力公司济南供电公司 | Grounding device convenient for measurement |
-
2012
- 2012-11-29 CN CN2012206434068U patent/CN203101518U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967767A (en) * | 2012-11-29 | 2013-03-13 | 山东电力集团公司检修公司 | High-precision low-power-consumption grounding resistance testing device |
| CN106025664A (en) * | 2016-06-27 | 2016-10-12 | 国网山东省电力公司济南供电公司 | Grounding device convenient for measurement |
| CN106025664B (en) * | 2016-06-27 | 2018-07-20 | 国网山东省电力公司济南供电公司 | A kind of earthing or grounding means convenient for measuring |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20130731 Termination date: 20171129 |