CN103018536A - Device and method for measuring dispersal impulse current characteristics of grounding electrode - Google Patents
Device and method for measuring dispersal impulse current characteristics of grounding electrode Download PDFInfo
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- CN103018536A CN103018536A CN2012105758878A CN201210575887A CN103018536A CN 103018536 A CN103018536 A CN 103018536A CN 2012105758878 A CN2012105758878 A CN 2012105758878A CN 201210575887 A CN201210575887 A CN 201210575887A CN 103018536 A CN103018536 A CN 103018536A
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Abstract
The invention discloses a device for measuring dispersal impulse current characteristics of a grounding electrode. The device comprises an impulse current generator, a hemispheric test flume, a simulated grounding electrode, a current sensor array, copper pins, a high-speed data acquisition card, a control and processing module and a display module. An input end of the impulse current generator is respectively connected with a 220V power frequency power source and a current injection point of the simulated grounding electrode through leads, the simulated grounding electrode is buried in the hemispheric test flume, the current sensor array is arranged at each point to be measured in soil around the simulated grounding electrode, the copper pins of the current sensor array are axially perpendicular to the simulated grounding electrode, a signal output end of the current sensor array is connected with an input end of the high-speed data acquisition card through a coaxial shielded cable, and the control and processing module is connected with the high-speed data acquisition card and the display module. The device is high in measurement efficiency of a dispersal impulse current rule of the grounding electrode and is simple, convenient and feasible in measurement process. The invention further discloses a method for measuring the dispersal impulse current characteristics of the grounding electrode by applying the device.
Description
Technical field
The present invention relates to power transmission and transforming equipment auxiliary appliance technical field, particularly a kind of earthing pole impacts the characteristics of the dispersed flow measurement mechanism.The earthing pole that the invention still further relates to a kind of this device of application impacts the characteristics of the dispersed flow measuring method.
Background technology
In present Operation of Electric Systems maintenance process, most of power transmission and transformation line accidents all are to cause owing to trip phenomenon that transmission line of lightning strike or shaft tower cause.And impact characteristics of the dispersed flow by measuring earthing pole, can study all sidedly the diffusing rule of earthing pole, and the lightning protection effect that scientifically improves power transmission and transformation line is had great importance.
Present existing earthing pole impacts in the characteristics of the dispersed flow measuring equipment, soil discharge process when it normally adopts the method simulation lightning current of simulated experiment soil is wandering towards periphery by earthing device, and the impact diffusing regularity of distribution of each position measured, yet, although can satisfying basic impact characteristics of the dispersed flow, this kind metering system measures needs, but because it need to change the position of sensor repeatedly with the related data of test zones of different, operating process is comparatively complicated, measure inefficiency, bring inconvenience for follow-up data processing and the smooth enforcement of concerned process steps.
Therefore, how so that earthing pole impact the characteristics of the dispersed flow measuring process more simple and effective be the important technological problems that those skilled in the art need to solve at present.
Summary of the invention
The purpose of this invention is to provide a kind of earthing pole and impact the characteristics of the dispersed flow measurement mechanism, this device can be so that earthing pole impacts more simple and effective of characteristics of the dispersed flow measuring process.Another object of the present invention provides a kind of earthing pole impact characteristics of the dispersed flow measuring method that above-mentioned earthing pole impacts the characteristics of the dispersed flow measurement mechanism of using.
For solving the problems of the technologies described above, the invention provides a kind of earthing pole and impact the characteristics of the dispersed flow measurement mechanism, comprise impulse current generator, semisphere test flume, the analogue ground utmost point, current sensor array, copper pin, high-speed data acquisition card, control processing module, display module;
The input end of described impulse current generator by wire respectively with the 220V power frequency supply be connected the electric current decanting point of the analogue ground utmost point and be connected; The described analogue ground utmost point is embedded in the described semisphere test flume; Described current sensor arranged in arrays each tested point place in the soil around the described analogue ground utmost point, its copper pin and analogue ground pole axis are to vertical; The signal output part of described current sensor array is connected with the input end of high-speed data acquisition card by coaxial shielded cable; Described control processing module is connected with described high-speed data acquisition card and described display module.
Preferably, described current sensor array comprises some current sensors, described current sensor comprises not magnetic conduction skeleton, copper coil, integrating circuit, bayonet nut connector body and polymer insulation shell and copper pin, and described copper coil is sheathed on the outside of described not magnetic conduction skeleton.
Preferably, be equiped with the moisture sand that particle diameter is 0.05～1mm in the described semisphere test flume.
The present invention also provides a kind of earthing pole to impact the characteristics of the dispersed flow measuring method, comprises step:
Determine the simulated experiment condition, according to actual condition and the corresponding test condition of test Location of requirement;
The characteristics of the dispersed flow measurement mechanism according to actual condition, is impacted with earthing pole and wiring is carried out in the test loop in the joint test loop;
The control processing parameter is set, according to the test needs, sets relevant control processing parameter;
Experimental measurement, the earthing pole of measuring under the current working environment impacts the characteristics of the dispersed flow related data.
Relative above-mentioned background technology, earthing pole provided by the present invention impacts the characteristics of the dispersed flow measurement mechanism, comprises impulse current generator, semisphere test flume, the analogue ground utmost point, current sensor array, copper pin, high-speed data acquisition card, control processing module, display module; The input end of described impulse current generator by wire respectively with the 220V power frequency supply be connected the electric current decanting point of the analogue ground utmost point and be connected; The described analogue ground utmost point is embedded in the described semisphere test flume; Described current sensor arranged in arrays each tested point place in the soil around the described analogue ground utmost point, its copper pin and analogue ground pole axis are to vertical; The signal output part of described current sensor array is connected with the input end of high-speed data acquisition card by coaxial shielded cable; Described control processing module is connected with described high-speed data acquisition card and described display module.In the single charge and discharge process, this device can be measured the dispersed current of grounding grids value of 12 crucial tested points, does not need again to rearrange sensor, and the measurement efficient of earthing pole being impacted the diffusing rule is high, and measuring process is simple and easy to do; And the current value of each measurement point is measured when once discharging and recharging, and measurement result more accurately and reliably.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The earthing pole that Fig. 1 provides for a kind of embodiment of the present invention impacts system's connection layout of characteristics of the dispersed flow measurement mechanism;
The earthing pole that Fig. 2 provides for a kind of embodiment of the present invention impacts the schematic diagram of characteristics of the dispersed flow measurement mechanism;
Fig. 3 is the structural representation of current sensor part among Fig. 2;
Fig. 4 impacts the process flow diagram of characteristics of the dispersed flow measuring method for the earthing pole that a kind of embodiment of the present invention provides.
Embodiment
Core of the present invention provides a kind of earthing pole and impacts the characteristics of the dispersed flow measurement mechanism, and this device can be so that earthing pole impacts more simple and effective of characteristics of the dispersed flow measuring process; Simultaneously, provide a kind of earthing pole impact characteristics of the dispersed flow measuring method that above-mentioned earthing pole impacts the characteristics of the dispersed flow measurement mechanism of using.
In order to make those skilled in the art person understand better the present invention program, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1, Fig. 2 and Fig. 3, the earthing pole that Fig. 1 provides for a kind of embodiment of the present invention impacts system's connection layout of characteristics of the dispersed flow measurement mechanism; The earthing pole that Fig. 2 provides for a kind of embodiment of the present invention impacts the schematic diagram of characteristics of the dispersed flow measurement mechanism; Fig. 3 is the structural representation of current sensor part among Fig. 2.
In embodiment, the impact characteristics simulation test device of earthing device provided by the present invention mainly comprises impulse current generator 1, semisphere test flume 13, the analogue ground utmost point 14, current sensor array 20, copper pin 21, high-speed data acquisition card 18, control processing module 19, display module 20 etc.Impulse current generator 1 mainly comprises: intelligence control system 2, pressure regulator 3, step-up transformer 4, silicon stack 5, wave regulating resistor 6, harmonic inductance 7, impulse capacitor group 8, pneumatic ignition pill gap 9, air compressor 10.The input end of impulse current generator 1 is connected with the 220V power frequency supply by wire, and output terminal produce to impact amplitude, wavefront time, heavy impulse current that the wave rear time is adjustable, and is connected with the electric current decanting point of the analogue ground utmost point 14; The analogue ground utmost point 14 is embedded in the semisphere test flume 13; Self-control current sensor array 21 is arranged in around the analogue ground utmost point 14 each tested point place in the soil, and its copper pin 22 is axial vertical with the analogue ground utmost point 14; The signal output part of current sensor array 21 is connected with the input end of high-speed data acquisition card 18 by coaxial shielded cable 16; Control processing module 19 is connected with high-speed data acquisition card 18 and display module 20.In the single charge and discharge process, this device can be measured the dispersed current of grounding grids value of 12 crucial tested points, does not need again to rearrange sensor, and the measurement efficient of earthing pole being impacted the diffusing rule is high, and measuring process is simple and easy to do; And the current value of each measurement point is measured when once discharging and recharging, and measurement result more accurately and reliably.
Further, current sensor array 21 is made of one group of 2 ~ 12 current sensor, and each sensor comprises not magnetic conduction skeleton 23, copper coil 25, integrating circuit 27, bayonet nut connector body 26 and polymer insulation shell 24 and copper pin 22.For ease of processing and on-the-spot the installation, magnetic conduction skeleton 23 has not been selected the cirque structure of round section in design, in order to make the magnetic field intensity on the wire turn cross section be tending towards equating everywhere, reduce the status requirement to a current carrying conductor as far as possible, usually get the ratio of ring radius in the diameter in skeleton cross section and the skeleton about 1/6, its inner and outer ring radius is respectively a, b, gets b=(1.1 ~ 1.2) a.Not magnetic conduction skeleton 23 for internal diameter be 30mm, external diameter be 35mm, diameter of section to be 5mm, material be the annulus of magnetic conduction polymkeric substance not, its Main Function is fixing copper coil 25.Copper coil 25 be that the copper enamel-cover circle line of 0.49mm evenly is wound on the not magnetic conduction skeleton 23 of annular by nominal diameter, the number of turn of coiling is 300 circles, the extension line at copper coil 25 two ends is connected with the input end of integrating circuit 27, in order to induction electromotive force u
1(t) carry out integration, thereby obtain induction current i
1(t).Consider that stray capacitance is very little, only when measuring the above frequency signal of 10MHz, just measurement result is had large impact, therefore, can ignore in the present invention.The output terminal of integrating circuit 27 is connected with the bayonet nut connector plug 26 of coaxial shielded cable 16 1 ends by bayonet nut connector body 26, and the other end of coaxial shielded cable 16 is connected with the input end of high-speed data acquisition card 18 by bayonet nut connector plug 26.Current sensor 21 surfaces be cast with the polymer insulation shell 24 that thickness is 8～10cm, damage measuring equipment in order to prevent large electric current from scurrying into the measuring circuit at current sensor place.The material of copper pin 22 is that nominal diameter is 2.44mm copper enamel-cover circle line, is fixed in the middle part of annulus by nonconducting plastics external member, and its Main Function is the dash current of drainage tested point.The Measurement bandwidth of current sensor array 21 is 200Hz～10MHz, it not only has good response characteristic, can measure accurately heavy impulse current, and current sensor is measured dash current by electromagnetic field couples, measuring coil itself and not direct electric the contacting of tested current return, therefore with major loop good electric insulation is arranged, simple in structure, linear good.
More specifically, semisphere test flume 13 is equiped with the moisture sand that particle diameter is 0.05～1mm, changes soil resistivity by the water cut that changes sand; But the horizontal slice hierarchical model of rock and sand simulated soil of mating formation in test flume can change the composite resistivity of soil easily by adjusting the sandstone ratio.
Please refer to Fig. 3, the process flow diagram of the reduction impulse grounding resistance value method that Fig. 3 provides for a kind of embodiment of the present invention.
In embodiment, coil dimension measuring method provided by the present invention comprises:
Step 101: determine the simulated experiment condition;
Determine the simulation test condition according to actual condition and the corresponding test condition according to the form below of test Location of requirement;
The simulation of simulation test impact characteristic
In the upper table, n is the engineer's scale of simulation test, according to physical condition, generally can be taken as 10 ~ 50.
Step 102: joint test loop;
According to actual condition, earthing pole is impacted the characteristics of the dispersed flow measurement mechanism and wiring is carried out in the test loop.Connecting line with the braiding copper strips links to each other the base of second copper ball of impulse current generator 1 with the electric current decanting point of the analogue ground utmost point 14; Current sensor array 21 is arranged in around the analogue ground utmost point 14 each tested point place in the soil, and its copper pin 22 is axial vertical with the analogue ground utmost point 14; The signal output part of current sensor array 21 is connected with the input end of high-speed data acquisition card 18 by coaxial shielded cable 16; Control processing module 19 is connected with high-speed data acquisition card 18 and display module 20.Check at last whether wiring correct, connect whether reliable, when whole wiring connect good after, just can carry out next step.
Step 103: the control processing parameter is set;
According to the test needs, set relevant control processing parameter.The intelligence control system 2 of inrush current generator 1 arranges charging modes, charging voltage, duration of charging, triggering mode etc.; At the data acquisition end, finish the setting such as sampling channel, sample frequency, triggering level, memory location of high-speed data acquisition card 18 by human-computer interaction interface, finish the simple process of data, and display mode of signal, channel selecting etc.
Step 104: experimental measurement;
The earthing pole of measuring under the current working environment impacts the characteristics of the dispersed flow related data.Press " beginning charging " key of the intelligence control system 2 of impulse current generator 1, when treating that 8 chargings of impulse capacitor group reach the predeterminated voltage value, press " triggering " key, dash current i
cAct on the analogue ground utmost point 14 of semisphere test flume interior 13, thereby finish the one-shot discharge test.The dash current value of read sensor array 21 obtains around the analogue ground utmost point 14 the impact diffusing value of each tested point in the soil, thereby obtains dash current characteristics of the dispersed flow in the soil around earthing pole.For guaranteeing the reliability of measurement data, under the prerequisite that does not change dash current and current sensor position, can repeat repeatedly to measure.
In summary, the earthing pole that provides among the present invention impacts the characteristics of the dispersed flow measurement mechanism, comprises impulse current generator, semisphere test flume, the analogue ground utmost point, current sensor array, copper pin, high-speed data acquisition card, control processing module, display module; The input end of described impulse current generator by wire respectively with the 220V power frequency supply be connected the electric current decanting point of the analogue ground utmost point and be connected; The described analogue ground utmost point is embedded in the described semisphere test flume; Described current sensor arranged in arrays each tested point place in the soil around the described analogue ground utmost point, its copper pin and analogue ground pole axis are to vertical; The signal output part of described current sensor array is connected with the input end of high-speed data acquisition card by coaxial shielded cable; Described control processing module is connected with described high-speed data acquisition card and described display module.In the single charge and discharge process, this device can be measured the dispersed current of grounding grids value of 12 crucial tested points, does not need again to rearrange sensor, and the measurement efficient of earthing pole being impacted the diffusing rule is high, and measuring process is simple and easy to do; And the current value of each measurement point is measured when once discharging and recharging, and measurement result more accurately and reliably.
In addition, the earthing pole that the above-mentioned earthing pole of application provided by the invention impacts the characteristics of the dispersed flow measurement mechanism impacts the characteristics of the dispersed flow measuring method, and its measuring process is simple and easy to do, measures efficient higher.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Above earthing pole provided by the present invention is impacted the characteristics of the dispersed flow measurement mechanism and uses earthing pole that this earthing pole impacts the characteristics of the dispersed flow measurement mechanism and impact the characteristics of the dispersed flow measuring method and be described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (4)
1. an earthing pole impacts the characteristics of the dispersed flow measurement mechanism, it is characterized in that: comprise impulse current generator, semisphere test flume, the analogue ground utmost point, current sensor array, copper pin, high-speed data acquisition card, control processing module, display module;
The input end of described impulse current generator by wire respectively with the 220V power frequency supply be connected the electric current decanting point of the analogue ground utmost point and be connected; The described analogue ground utmost point is embedded in the described semisphere test flume; Described current sensor arranged in arrays each tested point place in the soil around the described analogue ground utmost point, its copper pin and analogue ground pole axis are to vertical; The signal output part of described current sensor array is connected with the input end of high-speed data acquisition card by coaxial shielded cable; Described control processing module is connected with described high-speed data acquisition card and described display module.
2. earthing pole as claimed in claim 1 impacts the characteristics of the dispersed flow measurement mechanism, it is characterized in that: described current sensor array comprises some current sensors, described current sensor comprises not magnetic conduction skeleton, copper coil, integrating circuit, bayonet nut connector body and polymer insulation shell and copper pin, and described copper coil is sheathed on the outside of described not magnetic conduction skeleton.
3. earthing pole as claimed in claim 1 impacts the characteristics of the dispersed flow measurement mechanism, and it is characterized in that: being equiped with particle diameter in the described semisphere test flume is the moisture sand of 0.05～1mm.
4. an earthing pole impacts the characteristics of the dispersed flow measuring method, it is characterized in that, comprises step:
Determine the simulated experiment condition, according to actual condition and the corresponding test condition of test Location of requirement;
The characteristics of the dispersed flow measurement mechanism according to actual condition, is impacted with earthing pole and wiring is carried out in the test loop in the joint test loop;
The control processing parameter is set, according to the test needs, sets relevant control processing parameter;
Experimental measurement, the earthing pole of measuring under the current working environment impacts the characteristics of the dispersed flow related data.
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