CN201965183U - Device for measuring grounding resistance of roof strap type lightening protector - Google Patents
Device for measuring grounding resistance of roof strap type lightening protector Download PDFInfo
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- CN201965183U CN201965183U CN201020294289XU CN201020294289U CN201965183U CN 201965183 U CN201965183 U CN 201965183U CN 201020294289X U CN201020294289X U CN 201020294289XU CN 201020294289 U CN201020294289 U CN 201020294289U CN 201965183 U CN201965183 U CN 201965183U
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Abstract
The utility model provides a device for measuring grounding resistance of a roof strap type lightening protector, belonging to the technical field of measuring the lightening-proof detection grounding resistance. The device comprises a resistance measuring instrument for measuring the grounding resistance of the roof strap type lightening protector, and a ground receiving instrument for receiving the measured data of the resistance measuring instrument; the resistance measuring instrument consists of a measurement gage, a data acquisition and control module and a first wireless communication module; and the ground receiving instrument consists of a power supply module, a single chip computer module and a second wireless communication module. The device is fast, simple and efficient, can fast detect the grounding resistance of a high-rise building; in addition, the labor intensity of inspectors is lightened, the danger during measurement is decreased, and the interference and influence from outside electromagnetic field in measuring can be reduced.
Description
Technical field:
The utility model relates to a kind of device that adopts wireless mode to measure roof lighting proof strip ground connection resistance, belongs to lightning protection and detects ground connection resistance field of measuring technique.
Background technology:
Good ground connection is one of the most effective means of shunting and release direct lightning strike and thunder and lightning electromagnetic interference (EMI) energy, also is potential balance bucking-out system basis.Lightning current is released to the earth by lighting proof strip, downlead, grounding body, thus the safety of protection buildings, personnel and equipment, so whether detect roof lighting proof strip ground connection resistance qualified very important.
At present each lightning protection center is the most frequently used is 4102,4102A, 4105 or ground resistance measuring instrument such as MI2124 whether detect stake resistance qualified, concrete grammar is to make two interpoles on ground, draw two lines to measuring instrument, and then draw single line from the roof lighting proof strip and receive on the measuring instrument, be i.e. three electrode method (0.618 method) or 30 ° of methods.Following regulation is arranged in the vocabulary of terms in DL/T621-1997 " ground connection of alternating-current electric device ": the summation of the resistance to earth of the earthing pole or the natural grounding utmost point and ground wire (downlead) resistance is called the stake resistance of earthing device.So comprising, stake resistance connects downlead resistance.And present a lot of newly-built buildings, the main muscle that all utilizes buildings does not have the disconnecting clamp or exposes measuring point at the building foundation as downlead, therefore must receive slotted line on the flooring lighting proof strip.
Original measurement lighting proof strip ground connection resistance has the following disadvantages:
1, the testing staff is relatively more arduous, measuring process is more tired.
The testing staff often must climb to the high building roof, down throws away p-wire from roof, take-up again after having surveyed.High building is more and more now, and required p-wire is very long, coils a big dish very heavy, so very tired very bitter.Not only increased the labour intensity of safeguarding, the waste lot of manpower and material resources, and also along with the urbanization development, the road surface sclerosis is more and more, and difficult finding can be for the soil of making interpole around the tested buildings.
2, testing process has danger.
It is relatively dangerous that the testing staff stands in roof, but also when lightning protection center, Sichuan Province testing staff occurring and detecting the lighting proof strip resistance, and when high roof was thrown away p-wire downwards, p-wire dropped on the hi-line, the unscheduled event that the testing staff gets an electric shock and dies at once.Also have in addition and use the jaw type ground resistance measuring instrument to test, but still need to go up high roof, and some hazardous areas, testing staff also inconvenience detects in the past.
There is electromagnetic interference (EMI) when 3, detecting.
In order to measure the stake resistance of high-rise top arrester, the E line of lengthening is thrown on " 4102 " on ground from the high-altitude, formed very big closed-loop path aloft, when neighbouring when electromagnetic field is arranged (as line of electric force, radio), will measure at this and produce interference current in loop, the closed-loop path area is big more, and interference current is big more, sometimes find not push button, pointer is just played table.This interference is at random, size that can't the quantitative Analysis error.
Even when utilizing ETCR2000 pincers type ground resistance measuring instrument, still need to climb to roof and go to measure, and when utilizing that reinforcing bar is done the situation of downlead in the building concrete, reinforcing bar constitutes the closed-loop path situation and also can't measure.
The utility model content
The utility model purpose:
The purpose of this utility model provides a kind of device that adopts wireless mode to measure lighting proof strip ground connection resistance, and the original detection method labour intensity of solution lighting proof strip ground connection resistance is big and the certain risk problem is arranged, and improves detection efficiency.
Technical scheme:
The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:
A kind of device of measuring the method for roof lighting proof strip ground connection resistance, comprise the ground connection resistance that is used to measure the roof lighting proof strip resistance measuring instrument, be used to receive the measurement data ground receiving instrument of resistance measuring instrument; Described resistance measuring instrument comprises meter, data acquisition and control module, first wireless communication module; Wherein said meter is connected with control module, first wireless communication module with data acquisition successively;
Described ground receiving instrument comprises power module, one-chip computer module, second wireless communication module; Wherein said power module is connected with one-chip computer module, second wireless communication module respectively, and one-chip computer module, second wireless communication module interconnect.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and data acquisition and control module adopt chip MSP430 as central processing unit CPU, the embedded 12/14ADC of described chip MSP430.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and first wireless communication module adopts the GPRS module.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and second wireless communication module of ground receiving instrument adopts integrated wireless data transmit-receive chip NRF403.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and the power module of ground receiving instrument adopts No. 5 dry cell power supplies of two joints.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and the resistance measuring instrument of roof also comprises metal shell, and described metal shell is connected with lighting proof strip.
Further, aforesaid employing wireless mode is measured the device of roof lighting proof strip ground connection resistance, and the one-chip computer module of ground receiving instrument comprises the A/D change-over circuit.
Beneficial effect:
1, the utility model is quick, simple, efficient is high, is beneficial to fast detecting high-rise stake resistance before summer, thunderstorm arrived, and pinpoints the problems, and in time rectification exempts from thunderbolt; In addition, alleviate testing staff's labour intensity, to roof, need not draw very long p-wire without stair climbing; Once more, do not use the high building roof, reduced the danger when measuring; At last, can reduce the interference and the influence of external electromagnetic field when measuring.
2, in the earthed system because of the corrosion or the loose contact of soil or some grounding body, can make whole ground loop resistance become big.Because the corrosion or the situation of loose contact not necessarily are present in the soil on the grounding body, and may be present in position such as downlead, so only rely on the stake resistance of measurement grounding body self not necessarily can find.Therefore what the utility model recorded is loop resistance, not only can survey the grounding body grounding resistance, the contact situation that can also find whole ground loop be connected situation, this is that traditional earth resistance method is not generally accomplished.
Description of drawings:
Fig. 1 is a measuring method principle flow chart of the present utility model.
Fig. 2 (a) is the instrumentation plan of measuring instrument; Fig. 2 (b) is the metering circuit schematic diagram of measuring instrument.
Fig. 3 is the hardware principle block diagram of measuring instrument of the present utility model.
Fig. 4 is data acquisition of the present utility model and control circuit figure.
Fig. 5 is the workflow diagram of measuring instrument of the present utility model, receiving instrument.
Fig. 6 is the synoptic diagram of measuring instrument riding position of the present utility model.
Fig. 7 is the downlead measuring instrument riding position synoptic diagram of establishing in addition of the present utility model.
Number in the figure: 1, secretly apply downlead; 2, measuring instrument; 3, lighting proof strip; 4, support card; 5, independent downlead; 6, steel bar framework.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
As shown in Figure 1, the flow process of the measuring method of lighting proof strip ground connection resistance of the present utility model, after roof adopts measuring instrument to measure roof lighting proof strip ground connection resistance, this resistance information translation is become digital signal, by wireless transmitting system, digital signal is sent to the ground receiving system of bottom of the building then.
As shown in Figure 2, among Fig. 2 (a), roof measurement device instrument comprises three parts: the circuit that 1. produces electromotive force E in the loop that lighting proof strip, downlead, grounding body, the earth constitute; 2. under the effect of this electromotive force E, produce electric current I in the loop, and measure the circuit of the numerical value of E and I respectively; 3. counting circuit R=E/I.The measuring instrument associated jaw portion provides test electromotive force E, measures the electric current I that produces simultaneously.
Among Fig. 2 (b), measurement result R
L=R
X+ (R
1//R
2//R
3// ... //Rn), electrode R in parallel
1, R
2..., Rn all-in resistance less than measured resistance R
XResistance, then can obtain Rx ≈ R
LIf measurement result is less than permissible value, then actual value is affirmed in safe range, i.e. actual value even also littler than test value.
As shown in Figure 3, after receiving commencing signal, single-chip microcomputer is finished the setting to port and system clock earlier, undesired signal in the ground loop is by in the required prime amplifier of current clamp mouthfeel, through being shaped to square wave after the low-pass filter filtering, square-wave signal is linked into single-chip microcomputer, according to the frequency of detected interfering frequency selection pumping signal, wave filter is arranged under the logical pattern of band of corresponding excitation frequency.Each parameter starts DAC and sends the driving voltage signal after setting completed, starts ADC then voltage and current signal is sampled, and again the data of sampling is carried out digital filtering after sampling finishes, by calculating the value that can obtain stake resistance.
As shown in Figure 4, measuring instrument is input to the data of measuring among the MSP432, after process D/A is converted to simulating signal, passes through the GPRS wireless system for transmitting data then, passes to ground receiving system.After ground receives signal, carry out the A/D conversion again, decoding and displaying is handled preservation to data then.
As shown in Figure 5, measurement mechanism of the present utility model comprises that mainly roof measures resistance and partial message transmission, terrestrial information Return Reception Dept. branch.After the ground receiving instrument sends test signal to it, begin to measure lighting proof strip ground connection resistance, resistance transfers digital signal to, utilizes wireless device transmissions to ground, and surface installation receives signal and handles, thereby realizes wireless mode measurement lighting proof strip ground connection resistance.
As shown in Figure 6, roof measuring instrument device jaw is stuck on the lighting proof strip downlead, automatically detect lighting proof strip ground connection resistance, then data are transmitted with GPRS (GSM), accept instrument by ground and accept, and data are analyzed, the testing staff tells in time by watching the result whether building-owner's lightning protection has problems, there is any problem, how rectifies and improves.Support card is used for supporting to hold lighting proof strip, its height 15-20cm, and spacing 80-100cm is installed in the parapet top.
As shown in Figure 7, present a lot of high buildings all are the steel bar framework structures, and reinforcing bar all constitutes closed circuit within the walls, and downlead is realized with reinforcing bar in the post, even if like this measuring instrument being stuck in what measure on the downlead also is the resistance value of a certain reinforcing bar closed circuit, certainly not real ground connection resistance.This resistance is very little certainly, can not reflect whether the ground connection resistance is qualified.At this moment in the time of can building in the building, other adds a downlead, and this line does not intersect with building steel bar framework structure, and only linking to each other with lighting proof strip on the top constitutes a loop, the measuring instrument frame thereon, measurement lighting proof strip ground connection resistance.
Further specify embodiment of the present utility model below, the utility model comprises following several sections:
1, part of detecting: roof measurement device instrument comprises three parts: the circuit that 1. produces electromotive force E in the loop that lighting proof strip, downlead, grounding body, the earth constitute; 2. under the effect of this electromotive force E, produce electric current I, and measure the circuit of the numerical value of E and I respectively; 3. counting circuit R=E/I.
2, control section: when detecting, send a commencing signal, the roof measuring instrument is started working on ground.Detection finishes and sends out end signal after data have passed, and measuring instrument enters dormant state, waits for test next time.Measurement data acquisition and control module adopt the super low-power consumption chip MSP430 of American TI Company as central processing unit CPU, obtain data by the test voltage sampling to meter.The embedded 12/14ADC of this chip, the most nearly 8 transmission channels.
3, hop: utilize wireless data transfer module, can adopt GPRS.The GPRS wireless communication module adopts the New-type radio communication module, realizes seamless link and bi-directional communication function to data, and its data transmission rate can reach 171kB/s.
4, receiving unit, ground receiving system sends commencing signal earlier, and the roof measuring instrument is started working.Test is started working, and is that signal down transmits with test data conversion, and ground receiving system begins to receive.Signal is converted into data, then analyzes, the result is fed back to the user.Utilize chip microcontroller, realize its function with the C Programming with Pascal Language.The instrument compatibility is accepted on ground, and a plurality of buildings roof measuring instruments can a shared receiving instrument.Receiving system can be noted detected resistance and detection time etc.
Receiving unit utilizes the integrated wireless data transmit-receive chip NRF403 of Norway Nordic company exploitation.It is that a single-chip ISM band double frequency point (433MHZ and 315MHZ) exempts to debug radio transmitting and receiving chip.It has FSK modulation and demodulation ability, and antijamming capability is strong; Adopt the PLL frequency synthesis technique, sensitivity is satisfied requirement of experiment fully up to-105dbm, and maximum transmission power reaches+10dbm; Have 2 signalling channels, be fit to the special occasions of needs multichannel work; Can be directly and microcontroller interface; Data rate can reach 20kB/S; Low in energy consumption, receiving holding state only is 8uA; Only need an external crystal and several capacitance-resistance, inductance element can constitute a complete radio-frequency (RF) transceiver, and circuit module is of a size of 30mm*22mm*6mm, can embed easily in the middle of the various measuring systems.Use need not application, and the service range of open ground can reach 1000m farthest in theory.
5, power supply and self lightning protection part, roof with the power supply of 220V line voltage, are the direct supply of 24V through the step-down AC-DC conversion partly, supply with measuring instrument and control and transmitting device.The ground receiving instrument adopts No. 5 dry cell power supplies of two joints.
The roof instrument within the protection domain of lighting proof strip, makes it exempt from direct stroke between roof end face and lighting proof strip.For preventing LEMP and lightning induction, the roof measuring instrument wrapped with the iron sheet box to shield, the iron sheet box is done good the connection with lighting proof strip.
The undocumented technology contents of present embodiment all belongs to ordinary skill general knowledge, the foregoing description shows foregoing of the present utility model is further described, but this should be interpreted as that the scope of the above-mentioned theme of the utility model only limits to the foregoing description, all technology that realizes based on foregoing all belong to open scope of the present utility model.
Claims (7)
1. device of measuring roof lighting proof strip ground connection resistance is characterized in that: comprise the ground connection resistance that is used to measure the roof lighting proof strip resistance measuring instrument, be used to receive the measurement data ground receiving instrument of resistance measuring instrument; Described resistance measuring instrument comprises meter, data acquisition and control module, first wireless communication module; Wherein said meter is connected with control module, first wireless communication module with data acquisition successively;
Described ground receiving instrument comprises power module, one-chip computer module, second wireless communication module; Wherein said power module is connected with one-chip computer module, second wireless communication module respectively, and one-chip computer module, second wireless communication module interconnect.
2. the device of measurement roof lighting proof strip ground connection resistance according to claim 1 is characterized in that: described data acquisition and control module adopt chip MSP430 as central processing unit CPU, the embedded 12/14ADC of described chip MSP430.
3. the device of measurement roof lighting proof strip ground connection resistance according to claim 1 is characterized in that: described first wireless communication module adopts the GPRS module.
4. the device of measurement roof lighting proof strip ground connection resistance according to claim 1 is characterized in that: second wireless communication module of described ground receiving instrument adopts integrated wireless data transmit-receive chip NRF403.
5. the device of measurement roof lighting proof strip ground connection resistance according to claim 1 is characterized in that: the power module of described ground receiving instrument adopts No. 5 dry cell power supplies of two joints.
6. the device of measurement roof lighting proof strip ground connection resistance according to claim 1, it is characterized in that: the resistance measuring instrument of described roof also comprises metal shell, described metal shell is connected with lighting proof strip.
7. the device of measurement roof lighting proof strip ground connection resistance according to claim 1, it is characterized in that: the one-chip computer module of described ground receiving instrument comprises the A/D change-over circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020294289XU CN201965183U (en) | 2010-08-17 | 2010-08-17 | Device for measuring grounding resistance of roof strap type lightening protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020294289XU CN201965183U (en) | 2010-08-17 | 2010-08-17 | Device for measuring grounding resistance of roof strap type lightening protector |
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| Publication Number | Publication Date |
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| CN201965183U true CN201965183U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020294289XU Expired - Fee Related CN201965183U (en) | 2010-08-17 | 2010-08-17 | Device for measuring grounding resistance of roof strap type lightening protector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980032A (en) * | 2010-08-17 | 2011-02-23 | 南京信息工程大学 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
| CN103499746A (en) * | 2013-09-27 | 2014-01-08 | 湖北省防雷中心 | Differnet-end double-display type earth resistance tester |
| CN107607789A (en) * | 2017-09-06 | 2018-01-19 | 扬州华峰防雷新科技有限公司 | A kind of ground resistance measurement method of lightning protection device |
| CN108459207A (en) * | 2018-07-06 | 2018-08-28 | 广东电网有限责任公司 | Grounding measurement device and grounding wire detection system |
-
2010
- 2010-08-17 CN CN201020294289XU patent/CN201965183U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980032A (en) * | 2010-08-17 | 2011-02-23 | 南京信息工程大学 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
| CN101980032B (en) * | 2010-08-17 | 2013-01-02 | 南京信息工程大学 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
| CN103499746A (en) * | 2013-09-27 | 2014-01-08 | 湖北省防雷中心 | Differnet-end double-display type earth resistance tester |
| CN107607789A (en) * | 2017-09-06 | 2018-01-19 | 扬州华峰防雷新科技有限公司 | A kind of ground resistance measurement method of lightning protection device |
| CN108459207A (en) * | 2018-07-06 | 2018-08-28 | 广东电网有限责任公司 | Grounding measurement device and grounding wire detection system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20130817 |