CN106841814A - Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method - Google Patents
Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method Download PDFInfo
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- CN106841814A CN106841814A CN201710057003.2A CN201710057003A CN106841814A CN 106841814 A CN106841814 A CN 106841814A CN 201710057003 A CN201710057003 A CN 201710057003A CN 106841814 A CN106841814 A CN 106841814A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
Abstract
The invention discloses earthed system earth resistance on-line monitoring system, including the earthing pole in loop, grounding resistance monitor instrument and the permanent interpole located at the 3m of subsurface 1 are in turn connected to form, wherein：Grounding resistance monitor instrument, including main controller module, with sound and light alarm module, data outputting module, display module, data processing module and connection A ends, the connection B ends being attached to, wherein there is the potential U and exciting current I that module and high frequency electric pickup model are obtained in circuit respectively in data processing module connection high frequency potential, and then calculate the resistance value R=U/I in loop.Grounding resistance monitor instrument is directly formed by connecting by 5 squares of sheath annealed copper wires respectively with earthing pole and permanent interpole.Frequency 1.5KHz, amplitude 60V pulse potentials U produced and module in high frequency potential there is.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 long-term use after finishing.
Description
Technical field
The present invention relates to technical field, more particularly to earthed system earth 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
Flow the generation of device damage or explosive accident, by downlead, by equipment and around equipment, the ground connection of embedded underground is
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, and the damage probability to equipment is smaller.The facility earthed system lightning protection resistance such as national regulations building, oil depot
Value is less than 10 Ω, the ground connection of lightning protection, anti-static grounding, the working earthing of electrical equipment, protective grounding and information system
Deng suitable common grounding system, its grounding resistance not should be greater than 4 Ω.Earthed system earth 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）
Earth 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, and the grounding resistance that GB is met to reach often uses many earthing pole parallel connections
Mode.Use Zinc-coated angle steel more earthing pole, connected by plain conductor between earthing pole, earthed system is finished once construction,
By not under the sight line of people, over time, in change, earthing pole is by soil containing acid for soil resistivity for its change
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 earthed 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 industrial-frequency alternating current of the 110HZ that tester sends or so is along ground connection
System, greatly dynamic to electric current Ghandler motion, the voltage difference between E, P is just the grounding resistance of earthed system divided by current value：R=
U/I。
Voltage drop method needs for two interpoles P, C to insert underground, while d12=D, d13=2D.General earthed system ground
Table can cause two interpoles cannot to insert underground using hardening of cement or steel construction hardening；The maximum of general giant ground system
, up to hundreds of meters of even upper kms, the length needs for being accomplished by p-wire using voltage drop method are longer, and field condition is for diagonal line length
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 make earthed system grounding resistance maximize reduce, such lightning current can just be promptly released into the earth in.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 for measuring is work
Frequency earth 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 measure right in real time 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 earth resistance on-line monitoring system, including it is sequentially connected shape
Into the earthing pole in loop, grounding resistance monitor instrument and the permanent interpole located at subsurface 1-3m, wherein：Earth resistance
Monitor, including main controller module, and sound and light alarm module, data outputting module, display module, the data being attached to
There is module and high frequency electric pickup in 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 resistance value R=U/I in loop.
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, there is module generation frequency 1.5KHz, amplitude 60V pulse potential U in high frequency potential, so as to permanent
Interpole, 5 squares of sheath annealed copper wires, the earth, produce exciting current I on the loop of earthing pole composition.
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 earth resistance on-line monitoring system, including main controller module, and even
Sound and light alarm module thereon, data outputting module, display module, data processing module and connection A ends, connection B ends are connected to, its
Middle data processing module connection high frequency potential generation module and high frequency electric pickup model obtain the potential U in circuit and swash respectively
Electric current I is encouraged, and then calculates the resistance value R=U/I in loop.
The monitoring method of the earth resistance of earthed system earth resistance on-line monitoring system, sets ground resistance as R ground, 5
Square sheath soft copper line resistance is R gold, and permanent auxiliary extremely R is auxiliary, by the data processing module of grounding resistance monitor instrument
There is the potential U and exciting current I that module and high frequency electric pickup model are obtained in circuit respectively in high frequency potential, and then calculate
Resistance value R=U/I in loop, then returned according to computing formula R ground=R-R gold-R is auxiliary calculates earth resistance resistance.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention measures earthed system grounding resistance using loop method, no
It is same as voltage drop method in the prior art.Voltage drop method is needed boost voltage pole P points away from earthed system, used as earthed system
Zero potential reference, P points can all make measured earthed system grounding resistance bigger than normal or inclined away from inner earthed system is too far away or too close
It is small.Simultaneously as lightning protection earthing system, the current source of existing voltage drop method is power frequency 110HZ, much smaller than the frequency of lightning current, nothing
Method really shows the impulse earthed resistance value that system is showed when 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 for the treatment of.
There is module and produce 1.5KHz frequency potentials in high frequency potential, high frequency electric is produced on loop, in 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 in the earth, there is clear and definite resistance requirement in the earthed system grounding resistance GB 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 long-term use 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 earth resistance on-line computing model；
Fig. 4 is the theory diagram of the embodiment of earthed system earth resistance on-line monitoring system of the present invention；
Fig. 5 is the circuit diagram of earthed system earth resistance on-line monitoring system of the present invention；
Wherein：1- main controller modules, 2- sound and light alarm modules, 3- data outputting modules, 4- display modules, 5- data processing moulds
There is module in block, 6- high frequency potentials, 7- high frequency electric pickup models, 8- earthing poles, 9- grounding resistance monitor instruments, 10- is permanent
Interpole, 11-5 squares of sheath annealed copper wire, 12- connection A ends, 13- connection B ends, 14- is greatly.
Specific 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, protection scope of the present invention is not constituted and is limited.
As shown in Figure 4 and Figure 5, earthed system earth 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, the display module 4, data being attached to
There is module 6 and high-frequency electrical in 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 resistance value R=U/I in loop.
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, there is module 6 generation frequency 1.5KHz, amplitude 60V pulse potential U in high frequency potential, so that
Exciting current I is produced on 10,5 squares of sheath annealed copper wires 11 of permanent interpole, the loop of the earth 14, earthing pole 8 composition.
In the above-described embodiments, the plasma ground pole that permanent interpole 10 is made for red copper, and permanently aid in
Filled with strong water suction anion material, inside is filled with ionization compound to the outside of electrode 10.
Refer to Fig. 3, the grounding resistance monitor instrument used in above-mentioned earth 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 there is module 6 in 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 resistance value R=U/I in loop.
As shown in figure 5, the monitoring method of the earth resistance of earthed system earth resistance on-line monitoring system, setting the earth electricity
It is R ground to hinder, and 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
There is the potential U and exciting current that module 6 and high frequency electric pickup model 7 are obtained in circuit respectively in the high frequency potential for managing module 5
I, and then the resistance value R=U/I in loop is calculated, electricity is then grounded according to auxiliary the calculating of computing formula R ground=R times-R gold-R
Resistance 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 spirit of the 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 (6)
1. earthed system earth resistance on-line monitoring system, it is characterised in that：Including being in turn connected to form the ground connection in 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）There is module in connection high frequency potential（6）With high frequency electric pickup model（7）The potential U in circuit is obtained respectively
With exciting current I, and then the resistance value R=U/I in loop is calculated.
2. earthed system earth resistance on-line monitoring system according to claim 1, it is characterised in that：Earth resistance is monitored
Instrument（9）With earthing pole（8）With permanent interpole（10）Directly pass through 5 squares of sheath annealed copper wires respectively（11）Connection and
Into.
3. earthed system earth resistance on-line monitoring system according to claim 2, it is characterised in that：High frequency potential occurs
Module（6）Frequency 1.5KHz, amplitude 60V pulse potential U are produced, so as 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.
4. earthed system earth resistance on-line monitoring system according to claim 1 and 2, it is characterised in that：It is described permanent
Property interpole（10）It is the plasma ground pole that red copper is made, and the permanent auxiliary electrode（10）Outside is filled with strong suction
Water anion material, inside is filled with ionization compound.
5. the ground connection electricity for being used in the earthed system earth resistance on-line monitoring system according to claim 1-4 any one
Resistance monitor, it is characterised in that：Including main controller module（1）, and the sound and light alarm module being attached to（2）, data it is defeated
Go out module（3）, display module（4）, data processing module（5）And connection A ends（12）, connection B ends（13）, wherein at the data
Reason module（5）There is module in connection high frequency potential（6）With high frequency electric pickup model（7）Respectively obtain circuit in potential U and
Exciting current I, and then calculate the resistance value R=U/I in loop.
6. the prison of the earth resistance of the earthed system earth resistance on-line monitoring system according to claim 2-4 any one
Survey method, it is characterised in that：Ground resistance as R ground is set, 5 squares of sheath soft copper line resistances are R gold, permanent auxiliary extremely R
It is auxiliary, by the data processing module of grounding resistance monitor instrument（5）High frequency potential occur module（6）With high frequency electric pickup model
（7）The potential U and exciting current I in circuit are obtained respectively, and then calculates the resistance value R=U/I in loop, then according to meter
Calculate formula R ground=R times-R gold-R is auxiliary calculates earth resistance resistance.
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| CN110879312A (en) * | 2018-09-06 | 2020-03-13 | 余振邦 | Method and device for measuring grounding impedance |
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| CN106841814B (en) | 2017-11-03 |
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