CN106841814B - Earthed system grounding resistance on-line monitoring system, on-line detector and monitoring method - Google Patents

Earthed system grounding resistance on-line monitoring system, on-line detector and monitoring method Download PDF

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Publication number
CN106841814B
CN106841814B CN201710057003.2A CN201710057003A CN106841814B CN 106841814 B CN106841814 B CN 106841814B CN 201710057003 A CN201710057003 A CN 201710057003A CN 106841814 B CN106841814 B CN 106841814B
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China
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module
grounding resistance
earthed
frequency
resistance
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CN201710057003.2A
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Chinese (zh)
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CN106841814A (en
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乔家福
张雅君
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江苏德大自动化设备有限公司
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates

Abstract

The invention discloses earthed system grounding resistance on-line monitoring system, including the earthing pole, grounding resistance monitor instrument and the permanent interpole located at the 3m of subsurface 1 in a loop are in turn connected to form, wherein:Grounding resistance monitor instrument, including main controller module, with the sound and light alarm module being attached to, data outputting module, display module, data processing module and connection A ends, connection B ends, wherein data processing module connection high frequency potential generation module and high frequency electric pickup model obtain the potential U and exciting current I in circuit respectively, and then calculate the R of the resistance value in loop=U/I.Grounding resistance monitor instrument is directly formed by connecting by 5 squares of sheath annealed copper wires respectively with earthing pole and permanent interpole.High frequency potential occurs module and produces frequency 1.5KHz, amplitude 60V pulse potentials U.In the present invention equipment can real time on-line monitoring earthed system, with storage, display, teletransmission, sound and light of alarm.Installation and debugging can be used for a long time after finishing.

Description

Earthed system grounding resistance on-line monitoring system, on-line detector and monitoring method
Technical field
The present invention relates to technical field, more particularly to earthed system grounding resistance on-line computing model.
Background technology
It is thunder and lightning after preventing equipment to be struck by lightning among numerous industries such as petrochemical industry, electric power, building, industrial and mining enterprises, communication The generation by device damage or explosive accident is flowed, the ground connection of embedded underground is by equipment and around equipment by downlead System is connected.Earthed system is to by being embedded in multiple metallic ground poles of underground certain depth and by conductor that these earthing poles are mutual The general name of the grounding body of connection one network structure of composition.Earthed system grounding resistance is smaller, and lightning current is discharged into the earth Speed is faster, smaller to the damage probability of equipment.The facility earthed system lightning protection resistance such as national regulations building, oil depot Value is less than 10 Ω, lightning protection, anti-static grounding, the working earthing of electrical equipment, the ground connection of protective grounding and information system Deng suitable common grounding system, its grounding resistance not should be greater than 4 Ω.Earthed system grounding resistance:It is electric current by earthed system stream Enter the earth and spread run into resistance at a distance through the earth flow direction again.Grounding resistance embody electric device with " " contact it is good The scale of degree and reflection grounded screen.
Power frequency earthing resistance:Power frequency or DC current flow through resistance during earthed system, are generally termed power frequency(Or direct current) Grounding resistance.
Impulse earthed resistance:The resistance that earthed system is presented when lightning impulse current flows through earthed system, is called impact and connects Ground resistance.
Earthed system scale varies, to reach that the grounding resistance for meeting national standard is often in parallel using many piece-root grafting earth polars Mode.Use more and connected between Zinc-coated angle steel, earthing pole by plain conductor earthing pole, earthed system is finished once construction, Its change is not by under the sight of people, and over time, soil resistivity is in change, and earthing pole is by soil containing acid Chemical composition after composition or microorganism decomposition etc. is slowly corroded, and the grounding resistance of earthed system can become larger.Work as resistance Equipment and personal safety cannot be protected when value exceedes safety value, it is therefore desirable to the grounding resistance of real-time monitoring grounding system.
Current earthed system grounding resistance measuring principle is voltage drop method, and metering system uses 2D methods or triangulation method(Figure 1、2)This measuring principle is by earth mat E and auxiliary current pole C, boost voltage pole P(Earthed system Zero potential reference)Three Press a straight line(Triangle)Arrangement, D is the distance of tested earthed system maximum diagonal, and d12 is earthed system and voltage pole P Distance, d13 is the distance of earthed system and electric current pole C.The 110HZ that tester is sent or so industrial-frequency alternating current is along ground connection System, greatly dynamic to electric current Ghandler motion, the grounding resistance of voltage difference divided by current value just for earthed system between E, P:R= U/I。
Voltage drop method needs two interpoles P, C inserting underground, while d12=D, d13=2D.General earthed system Table can cause two interpoles can not insert underground using hardening of cement or steel construction hardening;The maximum of general giant ground system Diagonal line length is up to hundreds of meters of even upper kms, and the length needs for being accomplished by p-wire using voltage drop method are longer, and field condition is It is difficult to, therefore the precision of measurement is difficult to ensure that;The main function of giant ground system is lightning protection, by increasing earthing pole Quantity earthed system grounding resistance is maximized reduction, such lightning current can be just promptly released into the earth.Impulse grounding Resistance can accurately show the Optimality of lightning protection earthing system.10/350uS of the main lump of energy of lightning current in 1-10Khz Lightning wave between, lightning current flows through the resistance value referred to as impulse earthed resistance of earthed system, and impulse earthed resistance is generally less than Power frequency earthing resistance.The power frequency 110HZ of voltage drop method, much smaller than the frequency of lightning current, the grounding resistance measured is work Frequency grounding resistance, the impulse earthed resistance value being not required to.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, can accurately it be measured in real time pair the invention provides product in the present invention Earthed system of the linea angulata after big, surface sealing, by setting up the prison that a permanent auxiliary earth pole can be reliably and with long-term The change of earthed system grounding resistance is surveyed, the impulse earthed resistance of the frequency detecting earthed system by simulating lightning current, is anti- Thunder safely provides valuable parameter.
The technical solution adopted in the present invention is:Earthed system grounding resistance on-line monitoring system, including it is sequentially connected shape Into the earthing pole in a loop, grounding resistance monitor instrument and the permanent interpole located at subsurface 1-3m, wherein:Grounding resistance Monitor, including main controller module, and sound and light alarm module, data outputting module, display module, the data being attached to Module and high frequency electric pickup occur for processing module and connection A ends, connection B ends, wherein data processing module connection high frequency potential Module obtains potential U and exciting current I in circuit respectively, and then calculates the R of the resistance value in loop=U/I.
Further, grounding resistance monitor instrument is directly protected by one 5 squares respectively with earthing pole and permanent interpole Set annealed copper wire is formed by connecting.
Further, module generation frequency 1.5KHz, amplitude 60V pulse potential U, so that permanent occur for high frequency potential Exciting current I is produced on the loop that interpole, 5 squares of sheath annealed copper wires, the earth, earthing poles are constituted.
Further, permanently aid in outside the plasma ground pole that extremely red copper is made, and permanent auxiliary electrode Filled with strong water suction anion material, inside is filled with ionization compound.
The grounding resistance monitor instrument used in above-mentioned grounding resistance on-line monitoring system, including main controller module, and even Sound and light alarm module, data outputting module, display module, data processing module and connection A ends, connection B ends thereon is connected to, its Module occurs for middle data processing module connection high frequency potential and high frequency electric pickup model obtains the potential U in circuit and swashed respectively Electric current I is encouraged, and then calculates the R of the resistance value in loop=U/I.
The monitoring method of the grounding resistance of earthed system grounding resistance on-line monitoring system, sets ground resistance as R, and 5 Square sheath soft copper line resistance is R gold, and permanent auxiliary extremely R is auxiliary, passes through the data processing module of grounding resistance monitor instrument High frequency potential generation module and high frequency electric pickup model obtain potential U and exciting current I in circuit respectively, and then calculate Resistance value R=U/I in loop, then according to calculation formula R=R returns-R gold-R is auxiliary calculates grounding resistance resistance.
Compared with prior art, the beneficial effects of the invention are as follows:The present invention is using loop method measurement earthed system ground connection resistance Value, different from voltage drop method in the prior art.Voltage drop method is needed boost voltage pole P points away from earthed system, is used as ground connection The Zero potential reference of system, P points can all make measured earthed system grounding resistance inclined away from inner earthed system is too far away or too close It is big or less than normal.Simultaneously as lightning protection earthing system, the current source of existing voltage drop method is power frequency 110HZ, much smaller than lightning current Frequency, it is impossible to the impulse earthed resistance value that system is showed when real performance lightning current flows through earthed system.
Setting up by permanent auxiliary earth pole in the present invention, makes it constitute a loop with monitored earthed system, Detector sends high frequency pumping potential, and loop current is produced on loop.It is so not hard by earthed system catercorner length, earth's surface Change the limitation of processing.
High frequency potential occurs module and produces 1.5KHz frequency potentials, is produced on loop in high frequency electric, simulation lightning current High-energy waveform lightning wave flows through the impulse earthed resistance value shown during earthed system, and measured resistance is truer.
It is protection equipment, personal safety in industrial production and life, need to be quick by electrostatic, lightning current etc. by equipment ground Safe release has clear and definite resistance requirement into the earth in the earthed system grounding resistance national standard under various working conditions, In the present invention equipment can real time on-line monitoring earthed system grounding resistance, with storage, display, teletransmission, sound and light alarm work( Energy.Installation and debugging can be used for a long time after finishing.
Brief description of the drawings
Fig. 1 is existing linear voltage drop method earthed system;
Fig. 2 is that method earthed system drops in existing triangular voltage;
Fig. 3 is the structure chart of one embodiment of earthed system grounding resistance on-line computing model;
Fig. 4 is the theory diagram of the embodiment of earthed system grounding resistance on-line monitoring system of the present invention;
Fig. 5 is the circuit diagram of earthed system grounding resistance on-line monitoring system of the present invention;
Wherein:At 1- main controller modules, 2- sound and light alarm modules, 3- data outputting modules, 4- display modules, 5- data Reason module, 6- high frequency potentials generation module, 7- high frequency electric pickup models, 8- earthing poles, 9- grounding resistance monitor instruments, 10- is forever Long property interpole, 11-5 squares of sheath annealed copper wire, 12- connection A ends, 13- connection B ends, 14- the earth.
Embodiment
In order to deepen the understanding of the present invention, the present invention is further described with reference to the accompanying drawings and examples, the implementation Example is only used for explaining the present invention, and protection scope of the present invention is not constituted and limited.
As shown in Figure 4 and Figure 5, earthed system grounding resistance on-line monitoring system, including it is in turn connected to form a loop Earthing pole 8, grounding resistance monitor instrument 9 and the permanent interpole 10 located at subsurface 1-3m, wherein:Grounding resistance monitor instrument 9, including main controller module 1, and sound and light alarm module 2, data outputting module 3, display module 4, the data being attached to Module 6 and high-frequency electrical occur for processing module 5 and connection A ends 12, connection B ends 13, the wherein connection of data processing module 5 high frequency potential Stream pickup model 7 obtains potential U and exciting current I in circuit respectively, and then calculates the R of the resistance value in loop=U/I.
In the above-described embodiments, grounding resistance monitor instrument 9 directly passes through one respectively with earthing pole 8 and permanent interpole 10 5 squares of sheath annealed copper wires 11 of root are formed by connecting.
In the above-described embodiments, module 6 generation frequency 1.5KHz, amplitude 60V pulse potential U occur for high frequency potential, so that Exciting current I is produced on the loop that permanent interpole 10,5 squares of sheath annealed copper wires 11, the earth 14, earthing poles 8 are constituted.
In the above-described embodiments, permanent interpole 10 is the plasma ground pole that red copper is made, and is permanently aided in The outside of electrode 10 is filled with strong water suction anion material, and inside is filled with ionization compound.
Refer to the grounding resistance monitor instrument used in Fig. 3, above-mentioned grounding resistance on-line monitoring system, including master controller mould Block 1, and sound and light alarm module 2, data outputting module 3, display module 4, data processing module 5 and the connection A being attached to End 12, connection B ends 13, wherein module 6 occurs for the connection of data processing module 5 high frequency potential and high frequency electric pickup model 7 is distinguished The potential U and exciting current I in circuit are obtained, and then calculates the R of the resistance value in loop=U/I.
As shown in figure 5, the monitoring method of the grounding resistance of earthed system grounding resistance on-line monitoring system, setting the earth electricity With hindering for R, 5 squares of sheath soft copper line resistances are R gold, and permanent auxiliary extremely R is auxiliary, at the data of grounding resistance monitor instrument The high frequency potential generation module 6 and high frequency electric pickup model 7 of reason module 5 obtain potential U and exciting current in circuit respectively I, and then calculate the R of the resistance value in loop=U/I, then according to calculation formula R=R returns-R gold-R is auxiliary calculates ground connection electricity Hinder resistance.
What embodiments of the invention were announced is preferred embodiment, but is not limited thereto, the ordinary skill people of this area Member, easily according to above-described embodiment, understands the spirit of the present invention, and makes different amplifications and change, but as long as not departing from this The spirit of invention, all within the scope of the present invention.

Claims (3)

1. earthed system grounding resistance on-line monitoring system, it is characterised in that:Ground connection including being in turn connected to form a loop Pole(8), grounding resistance monitor instrument(9)With the permanent interpole located at subsurface 1-3m(10), wherein:
Grounding resistance monitor instrument(9), including main controller module(1), and the sound and light alarm module being attached to(2), data Output module(3), display module(4), data processing module(5)And connection A ends(12), connection B ends(13), wherein the data Processing module(5)Connect high frequency potential and occur module(6)With high frequency electric pickup model(7)The potential U in circuit is obtained respectively With exciting current I;Grounding resistance monitor instrument(9)With earthing pole(8)With permanent interpole(10)It is directly 5 flat by one respectively Square sheath annealed copper wire(11)It is formed by connecting;
In monitoring, set ground resistance for R, 5 squares of sheath soft copper line resistances are R gold, permanently aid in extremely R auxiliary, logical Cross the data processing module of grounding resistance monitor instrument(5)High frequency potential occur module(6)With high frequency electric pickup model(7)Point Potential U and exciting current I that Huo Qu be in circuit, and then the R of the resistance value in loop=U/I is calculated, then according to calculation formula R=R returns-R gold-R is auxiliary calculates grounding resistance resistance.
2. earthed system grounding resistance on-line monitoring system according to claim 1, it is characterised in that:High frequency potential occurs Module(6)Produce frequency 1.5KHz, amplitude 60V pulse potential U, so that in permanent interpole(10), 5 squares of sheath annealed copper wires (11), the earth, earthing pole(8)Exciting current I is produced on the loop of composition.
3. earthed system grounding resistance on-line monitoring system according to claim 1 or 2, it is characterised in that:It is described permanent Property interpole(10)The plasma ground pole being made for red copper, and the permanent auxiliary electrode(10)Outside is filled with strong suction Water anion material, inside is filled with ionization compound.
CN201710057003.2A 2017-01-26 2017-01-26 Earthed system grounding resistance on-line monitoring system, on-line detector and monitoring method CN106841814B (en)

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CN201876499U (en) * 2010-03-29 2011-06-22 江西省电力科学研究院 Tower impact grounding resistance measuring instrument
CN203324381U (en) * 2013-07-23 2013-12-04 国家电网公司 Portable pole tower grounding device impulse grounding resistance measuring device
CN104749443A (en) * 2013-12-31 2015-07-01 孙巍巍 Measuring device for grounding resistance
CN104155526B (en) * 2014-08-01 2017-09-22 云南电力试验研究院(集团)有限公司电力研究院 A kind of method for measuring the electric power line pole tower earthing or grounding means Transient grounding resistance with lightning conducter
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CN104714067B (en) * 2015-03-16 2017-10-03 国家电网公司 The portable thunder and lightning stream generation apparatus and method tested for earthing or grounding means impact impedance
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CN105606924A (en) * 2015-12-17 2016-05-25 陕西省电力科学研究院 Impact characteristic measurement correction method for grounding device

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Address after: No. 10 Jingma River Branch Road, Xuzhou economic and Technological Development Zone, Jiangsu Province, Jiangsu

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Patentee after: Jiangsu Petrochemical Technology Co., Ltd.

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Denomination of invention: Grounding resistance online monitoring system, online detector and monitoring method of grounding system

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