CN101980032B - Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode - Google Patents
Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode Download PDFInfo
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- CN101980032B CN101980032B CN 201010255183 CN201010255183A CN101980032B CN 101980032 B CN101980032 B CN 101980032B CN 201010255183 CN201010255183 CN 201010255183 CN 201010255183 A CN201010255183 A CN 201010255183A CN 101980032 B CN101980032 B CN 101980032B
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Abstract
The invention provides a method and a device for measuring grounding resistance of a lightning protection belt on the top in a wireless mode, and belongs to the technical field of lightening-protection detection and grounding resistance measurement. The measurement method comprises the following steps of: measuring the grounding resistance of the lightning protection belt on the top by adopting a measuring instrument, converting the resistance information into a signal, and transmitting the signal to a ground receiving system on the bottom through a wireless transmission system. The device comprises a resistance measuring instrument used for measuring the grounding resistance of the lightning protection belt on the top, and a ground receiving system used for receiving the measured data of the resistance measuring instrument. The invention is quick and simple, has high efficiency, can quickly detect the grounding resistance of high-rise buildings, also reduces labor intensity of detectors, and simultaneously reduces danger during measurement and interference and influence of the outside electromagnetic field during measurement.
Description
Technical field:
The present invention relates to a kind of method and device that adopts wireless mode to measure grounding resistance of roof strap type lightening protector, belong to lightning protection and detect the grounding 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 grounding resistance of roof strap type lightening protector qualified very important.
At present each lightning protection center is the most frequently used is 4102,4102A, 4105 or the 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 roof strap type lightening protector 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 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, all utilize the main muscle of buildings as downlead, do not have the disconnecting clamp or expose measuring point at the building foundation, therefore must receive slotted line on the flooring lighting proof strip.
Original measurement lighting proof strip grounding resistance has the following disadvantages:
1, the testing staff is more arduous, and measuring process is more tired.
The testing staff often must climb to tall building roof, down throws away p-wire from roof, again take-up after having surveyed.High building is more and more now, and required p-wire is very long, and it is very heavy to coil into a good large dish, so very tired very bitter.Not only increased the labour intensity of safeguarding, wasted a large amount of manpower and materials, and along with Development of Urbanization, the road surface sclerosis is more and more, tested Around Buildings difficulty finds can be for the soil of making interpole.
2, testing process has danger.
It is relatively dangerous that the testing staff stands in roof, but also when Sichuan Province's lightning protection Spot detection personnel occurring and detecting the lighting proof strip resistance, when throwing away p-wire downwards from high roof, p-wire drops 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 upward to arrive 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 that lengthens is thrown on " 4102 " on ground from the high-altitude, formed very large closed-loop path aloft, when neighbouring when electromagnetic field is arranged (such as line of electric force, radio), will produce interference current in this measuring circuit, the closed-loop path area is larger, and interference current is larger, sometimes find not push button, pointer is just played table.This interference is at random, quantitatively the size of the error of calculation.
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 consists of the closed-loop path situation and also can't measure.
Summary of the invention
Goal of the invention:
The purpose of this invention is to provide a kind of device that adopts wireless mode to measure the lighting proof strip grounding resistance, solve the original detection method labour intensity of lighting proof strip grounding resistance greatly and the certain risk problem is arranged, improve detection efficiency.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
A kind of method that adopts wireless mode to measure grounding resistance of roof strap type lightening protector comprises the steps:
Steps A, resistance measuring instrument is arranged on the downlead between roof and the lighting proof strip, the ground receiving instrument is arranged at bottom of the building ground, resistance measuring instrument and ground receiving instrument all arrange wireless communication module;
The wireless communication module of step B, employing ground receiving instrument is to the resistance measuring instrument transmission beginning measuring control signal of roof;
The resistance measuring instrument of step C, roof receives the measuring control signal of ground receiving instrument, begins to measure grounding resistance of roof strap type lightening protector, measure complete after, described lighting proof strip grounding resistance information is converted to simulating signal through D/A;
Step D, adopt the wireless communication module of resistance measuring instrument, described simulating signal is sent to the ground receiving instrument of bottom of the building;
After step e, ground receiving instrument receive simulating signal, described simulating signal is carried out the A/D conversion, convert digital signal to, then data are processed preservation;
Step F, ground receiving instrument send the end measuring control signal to the resistance measuring instrument of roof, and the resistance measuring instrument of roof enters dormant state, waits for test next time.
Further, in the steps A of the method for above-mentioned employing wireless mode measurement grounding resistance of roof strap type lightening protector, a side that also is included in institute survey building arranges another root downlead, described downlead does not intersect with building steel bar framework structure, only link to each other with lighting proof strip on the top of building and consist of a loop, described resistance measuring instrument frame is measured the lighting proof strip grounding resistance on downlead.
A kind of application of aforementioned wireless mode is measured the device of the method for grounding resistance of roof strap type lightening protector, comprises for the resistance measuring instrument of the grounding resistance of measurement roof strap type lightening protector, for the measurement data ground receiving instrument that receives resistance measuring instrument; Described resistance measuring instrument comprises meter, data acquisition and control module, the first wireless communication module; Wherein said meter is connected with control module, the first wireless communication module with data acquisition successively;
Described ground receiving instrument comprises power module, one-chip computer module, the second wireless communication module; Wherein said power module is connected with one-chip computer module, the second wireless communication module respectively, and one-chip computer module, the second wireless communication module interconnect.
Further, aforesaid employing wireless mode is measured the device of grounding resistance of roof strap type lightening protector, 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 grounding resistance of roof strap type lightening protector, and the first wireless communication module adopts the GPRS module.
Further, aforesaid employing wireless mode is measured the device of grounding resistance of roof strap type lightening protector, and the 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 grounding resistance of roof strap type lightening protector, 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 grounding resistance of roof strap type lightening protector, 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 grounding resistance of roof strap type lightening protector, and the one-chip computer module of ground receiving instrument comprises the A/D change-over circuit.
Beneficial effect:
1, the present invention 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; Again, do not use tall building roof, reduced the danger when measuring; At last, can reduce interference and the impact of external electromagnetic field when measuring.
2, in the earthed system because of corrosion or the loose contact of soil or some grounding body, can make whole ground loop resistance become large.Because corrosion or the situation of loose contact not necessarily are present in the soil on the grounding body, and may be present in the position such as downlead, so only rely on the stake resistance of measuring grounding body self not necessarily can find.What the present invention recorded is loop resistance, therefore not only can survey the grounding body grounding resistance, can also find contact situation and the connection of whole ground loop, and this is that traditional method of Testing Earth-Contact Resistance is not generally accomplished.
Description of drawings:
Fig. 1 is measuring method principle flow chart of the present invention.
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 invention.
Fig. 4 is data acquisition of the present invention and control circuit figure.
Fig. 5 is the workflow diagram of measuring instrument of the present invention, receiving instrument.
Fig. 6 is the synoptic diagram of measuring instrument riding position of the present invention.
Fig. 7 is the downlead measuring instrument riding position synoptic diagram of establishing in addition of the present invention.
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 to technical scheme:
As shown in Figure 1, the flow process of the measuring method of lighting proof strip grounding resistance of the present invention after roof adopts measuring instrument to measure grounding resistance of roof strap type lightening protector, converts this resistance information to digital signal, then by wireless transmitting system, digital signal is sent to the ground receiving system of bottom of the building.
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 consist of; 2. generation current I under the effect of this electromotive force E, and measure respectively the circuit of the numerical value of E and I; 3. counting circuit R=E/I.The measuring instrument associated jaw portion provides test electromotive force E, measures simultaneously the electric current I that produces.
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 less than test value.
As shown in Figure 3, after receiving commencing signal, single-chip microcomputer is finished first the setting to port and system clock, 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 the interfering frequency selection pumping signal that detects, wave filter is arranged under the logical pattern of band of corresponding excitation frequency.Parameters starts DAC and sends the driving voltage signal after setting completed, then starts ADC 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, then passes through the GPRS wireless system for transmitting data, passes to ground receiving system.After ground receives signal, carry out the A/D conversion, decoding shows, then data is processed preservation again.
As shown in Figure 5, measurement mechanism of the present invention comprises that mainly roof measures resistance and partial message transmission, terrestrial information reception ﹠ disposal part.The ground receiving instrument begins to measure the lighting proof strip grounding resistance after it is sent test signal, and resistance transfers digital signal to, utilizes wireless device transmissions to ground, and surface installation receives signal and processes, thereby realizes wireless mode measurement lighting proof strip grounding resistance.
As shown in Figure 6, roof measuring instrument device jaw is stuck on the lighting proof strip downlead, automatically detect the lighting proof strip grounding resistance, then data are transmitted with GPRS (GSM), accept instrument by ground and accept, and to data analysis, 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 consists of 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 grounding resistance.This resistance is certainly very little, can not reflect whether grounding 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 consists of a loop, the measuring instrument frame thereon, measurement lighting proof strip grounding resistance.
The below further specifies embodiments of the invention, the present invention includes following several part:
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 consist of; 2. generation current I under the effect of this electromotive force E, and measure respectively the circuit of the numerical value of E and I; 3. counting circuit R=E/I.
2, control section: when detecting, send a commencing signal on ground, the roof measuring instrument is started working.Detect complete data and passed the rear end signal of sending out, 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 first commencing signal, 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, with result feedback to the user.Utilize the monolithic function to realize, realize its function with the C Programming with Pascal Language.The instrument compatibility is accepted on ground, and a plurality of building roof measuring instruments can share a receiving instrument.Receiving system can be recorded detected resistance and detection time, place, object.
Receiving unit utilizes the integrated wireless data transmit-receive chip NRF403 of Norway Nordic company exploitation.It is that a single-chip ISM band dual-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 consist of 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 connected good connection with lighting proof strip.
The undocumented technology contents of present embodiment all belongs to ordinary skill general knowledge, above-described embodiment shows foregoing of the present invention is further described, but this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to above-described embodiment, all technology that realizes based on foregoing all belong to open scope of the present invention.
Claims (9)
1. a method that adopts wireless mode to measure grounding resistance of roof strap type lightening protector is characterized in that, comprises the steps:
Steps A, resistance measuring instrument is arranged on the downlead between roof and the lighting proof strip, the ground receiving instrument is arranged at bottom of the building ground, resistance measuring instrument and ground receiving instrument all arrange wireless communication module;
The wireless communication module of step B, employing ground receiving instrument is to the resistance measuring instrument transmission beginning measuring control signal of roof;
The resistance measuring instrument of step C, roof receives the measuring control signal of ground receiving instrument, begins to measure grounding resistance of roof strap type lightening protector, measure complete after, described lighting proof strip grounding resistance information is converted to simulating signal through D/A;
Step D, adopt the wireless communication module of resistance measuring instrument, described simulating signal is sent to the ground receiving instrument of bottom of the building;
After step e, ground receiving instrument receive simulating signal, described simulating signal is carried out the A/D conversion, convert digital signal to, then data are processed preservation;
Step F, ground receiving instrument send the end measuring control signal to the resistance measuring instrument of roof, and the resistance measuring instrument of roof enters dormant state, waits for test next time.
2. employing wireless mode according to claim 1 is measured the method for grounding resistance of roof strap type lightening protector, it is characterized in that: in the steps A, a side that also is included in institute survey building arranges another root downlead, described another root downlead does not intersect with building steel bar framework structure, only link to each other with lighting proof strip on the top of building and consist of a loop, described resistance measuring instrument frame is measured the lighting proof strip grounding resistance on another root downlead.
3. an application adopts wireless mode to measure the device of the method for grounding resistance of roof strap type lightening protector as claimed in claim 1, it is characterized in that: comprise resistance measuring instrument for the grounding resistance of measuring roof strap type lightening protector, be used for receiving the ground receiving instrument of the measurement data of resistance measuring instrument; Described resistance measuring instrument comprises meter, data acquisition and control module, the first wireless communication module; Wherein said meter is connected with control module, the first wireless communication module with data acquisition successively;
Described ground receiving instrument comprises power module, one-chip computer module, the second wireless communication module; Wherein said power module is connected with one-chip computer module, the second wireless communication module respectively, and one-chip computer module, the second wireless communication module interconnect.
4. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, it 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.
5. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, it is characterized in that: described the first wireless communication module adopts the GPRS module.
6. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, it is characterized in that: the second wireless communication module of described ground receiving instrument adopts integrated wireless data transmit-receive chip NRF403.
7. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, it is characterized in that: the power module of described ground receiving instrument adopts No. 5 dry cell power supplies of two joints.
8. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, and it is characterized in that: the resistance measuring instrument of described roof also comprises metal shell, and described metal shell is connected with lighting proof strip.
9. employing wireless mode according to claim 3 is measured the device of grounding resistance of roof strap type lightening protector, and 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 |
|---|---|---|---|
| CN 201010255183 CN101980032B (en) | 2010-08-17 | 2010-08-17 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255183 CN101980032B (en) | 2010-08-17 | 2010-08-17 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
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| CN101980032A CN101980032A (en) | 2011-02-23 |
| CN101980032B true CN101980032B (en) | 2013-01-02 |
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| CN 201010255183 Expired - Fee Related CN101980032B (en) | 2010-08-17 | 2010-08-17 | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN102680797A (en) * | 2011-03-10 | 2012-09-19 | 云南电力试验研究院(集团)有限公司 | Method for evaluating effect of grounding resistance reducing measures by aid of electric transmission line poles and towers for electricity |
| CN103018571A (en) * | 2012-12-05 | 2013-04-03 | 北京工业大学 | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line |
| CN104330682A (en) * | 2014-10-08 | 2015-02-04 | 南京信息工程大学 | Lightning strip on-off performance detector |
| CN104502725B (en) * | 2014-11-21 | 2017-12-08 | 国家电网公司 | Ground resistance measuring instrument terminal data acquisition system and method |
| CN105242112A (en) * | 2015-09-02 | 2016-01-13 | 华北电力科学研究院有限责任公司 | Wind power generator set lightning triggering channel resistance value test method |
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| CN110187188B (en) * | 2019-07-08 | 2024-09-20 | 福建建利达工程技术有限公司 | Multifunctional lightning protection detection device |
| CN111796217B (en) * | 2020-07-28 | 2023-05-16 | 中科天际科技股份有限公司 | Intelligent detection device, system and method for broken connector |
| CN112485532B (en) * | 2020-12-01 | 2022-02-25 | 山东建筑大学 | Multi-down-lead grounding resistance measuring method based on node voltage method |
| CN113791282B (en) * | 2021-09-13 | 2024-03-19 | 深圳市欧拓自动化科技有限公司 | Electricity safety monitoring system and building thereof |
| CN113884789B (en) * | 2021-09-13 | 2023-11-10 | 湖州电力设计院有限公司 | Lightning protection grounding performance evaluation method for steel structure transformer substation |
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| CN201965183U (en) * | 2010-08-17 | 2011-09-07 | 南京信息工程大学 | Device for measuring grounding resistance of roof strap type lightening protector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6248231A (en) * | 1985-08-23 | 1987-03-02 | 関西電力株式会社 | Steel tower information collector |
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| US4142143A (en) * | 1977-11-18 | 1979-02-27 | The United States Of America As Represented By The Secretary Of The Navy | Lightning ground system attachable admittance testing instrument |
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| CN201007846Y (en) * | 2006-11-07 | 2008-01-16 | 西安神电电器有限公司 | On-line monitoring system for lightning arrester |
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| 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 |
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