CN115932976A - High-power constant-voltage electromagnetic emission integrated measurement system - Google Patents
High-power constant-voltage electromagnetic emission integrated measurement system Download PDFInfo
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- CN115932976A CN115932976A CN202211522509.3A CN202211522509A CN115932976A CN 115932976 A CN115932976 A CN 115932976A CN 202211522509 A CN202211522509 A CN 202211522509A CN 115932976 A CN115932976 A CN 115932976A
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Abstract
The invention provides a high-power constant-voltage electromagnetic emission integrated measurement system which comprises a high-power generator, a constant-current emission module, a constant-voltage emission module and an electromagnetic receiving module, wherein the high-power generator is electrically connected with the constant-current emission module and the constant-voltage emission module, the high-power generator, the constant-current emission module and the constant-voltage emission module form a high-power electromagnetic emission control system, the high-power electromagnetic emission control system sends an excitation current signal, and the excitation current signal takes the ground as a transmission medium and is received by the electromagnetic receiving module, so that the measurement of underground ground electricity information is completed. The high-power electromagnetic emission control system is composed of the high-power generator, the constant-current emission module and the constant-voltage emission module, and under the condition that the grounding condition is not good, the electromagnetic signal meeting the technical requirement can be well sent under the grounding condition with relatively high resistance by adopting the high-voltage constant-voltage emission system, so that the field cost is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of electromagnetic surveying, and particularly relates to a high-power constant-voltage electromagnetic emission integrated measurement system.
Background
The measurement by an electric (magnetic) method is one of important working means of geophysical exploration, and is widely applied to the fields of oil-gas exploration, solid mineral exploration, underground water, geothermy, engineering exploration, deep geological structure research and the like. The high-power electromagnetic emission systems which are put into use at home and abroad at present and have power of more than 150KW are respectively a T200 transmitter of Canadian Phoenix geophysical company, a TFEM-3 time-frequency emission system of China eastern Petroleum geophysical exploration Limited liability company and a JSGY-2 wide-area electromagnetic emission system developed by Hunan-advanced science, the high-power electromagnetic emission systems adopt a single constant current or voltage mode, the two emission modes have respective advantages and disadvantages, the large current output by the emission system in the constant current mode is steady current emission, the amplitude change of the output current is smaller than 2% through excitation adjustment, and the high-power electromagnetic emission system is suitable for a time domain electromagnetic method, a middle and low frequency domain electromagnetic method, and has the defects that the mode has higher requirement on grounding conditions and is difficult to emit large current when meeting the environment of mountain bedrock exposure or earth surface gravel accumulation; the emitting system under the constant voltage mode adopts the mode of fixed voltage to output heavy current, and output voltage is up to 2000V, and emission current changes along with the change of frequency and impedance in the frequency domain electromagnetic method, and current emission is gradually stable when reaching certain low frequency channel, and the change of output current amplitude is less than 5% when constant frequency, and this mode adopts bigger constant voltage components and parts, and big voltage output is more suitable for emitting the electromagnetic signal that satisfies the construction requirement in mountain area, desert or gobi area that the earthing condition is relatively poor.
Based on this, a high-power constant voltage electromagnetic emission integrated measurement system is provided.
Disclosure of Invention
The present invention provides a high-power constant-voltage electromagnetic emission integrated measurement system to solve the above-mentioned problems in the background art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a high-power constant-voltage electromagnetic emission integrated measurement system comprises a high-power generator, a constant-current emission module, a constant-voltage emission module and an electromagnetic receiving module, wherein the high-power generator is used for supplying power, the high-power generator is electrically connected with the constant-current emission module and the constant-voltage emission module, and a high-power electromagnetic emission control system is formed by the high-power generator, the constant-current emission module and the constant-voltage emission module;
the high-power electromagnetic emission control system sends out an excitation current signal, the excitation current signal takes the ground as a transmission medium and is received by the electromagnetic receiving module, and therefore measurement of underground ground electricity information is completed.
Furthermore, the power of the high-power generator is 150-400kw.
Furthermore, an excitation regulator is connected between the constant current emission module and the constant voltage emission module, and the excitation regulator is used for regulating and controlling the output current of the high-power generator in real time when the constant current emission module and the constant voltage emission module work.
Furthermore, the high-power electromagnetic emission control system adopts a constant current mode under a better grounding condition, and adjusts and controls the output current of the high-power generator in real time through the excitation regulator according to the impedance and the working current with preset frequency;
if the load is overlarge and the emission current is reduced, the phase-shifting trigger pulse of the excitation regulator moves forward to increase the conduction time of the controllable silicon so as to increase the excitation current, increase the output voltage of the high-power generator and increase the load current, otherwise, the voltage of the generator is reduced, the current is reduced, and the output load current of the generator is kept constant;
when the grounding condition is poor, a constant voltage mode is adopted, fixed voltage is set by an excitation control device according to impedance and working current with preset frequency, and the purpose of outputting current signals is achieved by stabilizing higher voltage.
Compared with the prior art, the invention has the following advantages:
the invention uses high-power generator, constant-current emission module and constant-voltage emission module to form high-power electromagnetic emission control system, when the grounding condition is better, it uses constant-current mode, and according to the working current of impedance and preset frequency, it uses excitation regulator to make real-time regulation and control on the output current of high-power generator, if the load is too large, the emission current is reduced, at this time, the phase-shifting trigger pulse of excitation regulator is moved forward, and the conduction time of silicon controlled is increased, so that the excitation current is increased, the output voltage of high-power generator is raised, and the load current is raised, otherwise, the voltage of generator is reduced, the current is reduced, and the output load current of generator is maintained constant, when the grounding condition is worse, it uses constant-voltage mode, and according to the working current of impedance and preset frequency, it uses excitation control device to set fixed voltage, and can use stable higher voltage to achieve the purpose of outputting current signal. Under the condition of extreme grounding, the conventional high-power constant-current transmitting system is difficult to transmit large current, so that the detection depth cannot meet the design requirement, under the condition of poor grounding condition, a large amount of manpower and material resources are consumed to reduce the grounding resistance in a high-power constant-current transmitting mode generally, and the problem that electromagnetic signals meeting the technical requirements are transmitted under the grounding condition with relatively high resistance can be well solved by adopting a high-voltage constant-voltage transmitting system, so that the field cost is effectively reduced.
Drawings
FIG. 1 is an exploded view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a current square wave signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another current square wave signal in an embodiment of the invention.
Description of the reference numerals:
1-a high power generator; 2-a constant current emission module; 3-constant voltage transmitting module; 4-; an excitation regulator; 5-excitation current signal; 6-an electromagnetic receiving module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a technical solution: a high-power constant-voltage electromagnetic emission integrated measurement system comprises a high-power generator 1, a constant-current emission module 2, a constant-voltage emission module 3 and an electromagnetic receiving module 6, wherein the high-power generator 1 is used for completing power supply, and the power of the high-power generator 1 is 150-400kw.
The high-power generator 1 is electrically connected with the constant-current transmitting module 2 and the constant-voltage transmitting module 3, the high-power generator 1, the constant-current transmitting module 2 and the constant-voltage transmitting module 3 form a high-power electromagnetic transmitting control system, the voltage transmitted by the constant-voltage transmitting module 3 is higher than that transmitted by other equipment, the rated output voltage of the existing high-power electromagnetic transmitting system is 1200-1500V, the rated voltage of the integrated constant-voltage transmitting control module can reach 2000V, and under the same complex grounding condition, the current transmitted is relatively higher and more stable due to the fact that the rated voltage of the transmitter is high and the current is adjusted through excitation.
The high-power electromagnetic emission control system sends out an excitation current signal 5, wherein the excitation current signal 5 is specifically two current square wave signals, and is specifically shown in fig. 2 and 3.
The excitation current signal 5 takes the earth as a transmission medium and is received by the electromagnetic receiving module 6, so that the measurement of the underground earth electrical information is completed.
And an excitation regulator 4 is also connected between the constant current emission module 2 and the constant voltage emission module 3, and the excitation regulator 4 is used for regulating and controlling the output current of the high-power generator 1 in real time when the constant current emission module 2 and the constant voltage emission module 3 work.
The high-power electromagnetic emission control system adopts a constant current mode when the grounding condition is good, and adjusts and controls the output current of the high-power generator 1 in real time through the excitation regulator 4 according to the impedance and the working current with preset frequency;
if the load is overlarge and the emission current is reduced, the phase-shifting trigger pulse of the excitation regulator 4 moves forward to increase the conduction time of the controllable silicon so that the excitation current is increased, the output voltage of the high-power generator 1 is increased, the load current is increased, otherwise, the voltage of the generator is reduced, the current is reduced, and the output load current of the generator is kept constant;
when the grounding condition is poor, a constant voltage mode is adopted, fixed voltage is set by using an excitation control device according to impedance and working current with preset frequency, and the purpose of outputting current signals is achieved by stabilizing higher voltage.
Under the condition of extreme grounding, the conventional high-power constant-current transmitting system is difficult to transmit large current, so that the detection depth cannot meet the design requirement, under the condition of poor grounding condition, a large amount of manpower and material resources are consumed in a high-power constant-current transmitting mode to reduce the grounding resistance, and the large-voltage constant-voltage transmitting system can well solve the problem of transmitting electromagnetic signals meeting the technical requirements under the grounding condition with relatively high resistance, so that the field cost is effectively reduced.
For example, when the earth surface ground resistance of a transmitting end of a certain mining area reaches 50 Ω, 50A current needs to be transmitted, the rated voltage of a general constant current device is 1500V, the resistance needs to be reduced to 30 Ω, more than 20 aluminum plates with the spacing of 5m and the depth of 50cm are needed, about 40 × 40cm are needed, the estimated cost is about 3000 yuan, and the rated voltage of a constant voltage transmitting system is 2000V, so that less than half of the cost is needed under the same condition.
Experimental example: in a certain large-scale copper multi-metal ore electromagnetic exploration project in Tibet, experimental research is carried out by depending on a short-emission 150kw high-power electromagnetic measurement system in an embodiment;
the plateau is seriously lack of oxygen due to the fact that the altitude of the east part of the Gangbeisi structure zone Lassa plots in the area is 4200-5300 m, the shallow earth surface is constructed due to mining areas and naturally weathered, the stratum structure is complex, exposed rocks mainly include metamorphic cornerite and limestone, some rocks are complete, some rocks are broken, the grounding condition is poor, and the grounding resistance reaches 30 omega.
Before the test work, two measurement methods of a controllable source audio frequency geoelectromagnetic method of a frequency domain and an induced polarization measurement of a time domain are adopted firstly under a constant current mode, and the test result shows that: the maximum transmitting current of 50A is measured in a low-frequency range of 10.6-0.75Hz by a controllable source audio frequency geoelectromagnetic method, and only 12A is transmitted in a high-frequency range of 1920-1024Hz due to large impedance; the current for measuring the induced current is also 50A, the measured resistivity and the measured polarizability are relatively stable, and the repeatability is good.
Secondly, the same test is carried out in a constant pressure mode, and the test result shows that: the maximum transmitting current of the controllable source audio frequency geoelectromagnetic method can reach 65A at 10.6-0.75Hz in the low frequency band, and the transmitting current of the controllable source audio frequency geoelectromagnetic method only reaches 19A at 1920-1024Hz in the high frequency band; the current measured by the excitation is 65A, the measured resistivity and the measured polarization rate are relatively stable, but the sending current in the constant voltage mode is not as stable as that in the constant current mode, and the repeatability is not as good as that of the test result in the constant current mode.
In conclusion, the test result shows that the invention can not only meet the electromagnetic emission measurement in general geological environment, but also provide higher emission current through the combination or conversion of constant current and constant voltage modes particularly under the complex grounding condition, thereby meeting the detection requirements of different depths and providing convenience for developing electromagnetic exploration in different geological environments.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A high-power constant-voltage electromagnetic emission integrated measurement system is characterized in that: the high-power electromagnetic emission control system comprises a high-power generator (1), a constant-current emission module (2), a constant-voltage emission module (3) and an electromagnetic receiving module (6), wherein the high-power generator (1) is used for supplying power, the high-power generator (1) is electrically connected with the constant-current emission module (2) and the constant-voltage emission module (3), and the high-power generator (1), the constant-current emission module (2) and the constant-voltage emission module (3) form a high-power electromagnetic emission control system;
the high-power electromagnetic emission control system sends out an excitation current signal (5), the excitation current signal (5) takes the ground as a transmission medium and is received by an electromagnetic receiving module (6), and therefore measurement of underground ground electricity information is completed.
2. A high power constant voltage electromagnetic emission integrated measurement system according to claim 1, characterized in that the power of the high power generator (1) is in the range of 150-400kw.
3. The integrated measuring system for the high-power constant-voltage electromagnetic emission according to claim 1, wherein an excitation regulator (4) is further connected between the constant-current emission module (2) and the constant-voltage emission module (3), and the excitation regulator (4) is used for regulating and controlling the output current of the high-power generator (1) in real time when the constant-current emission module (2) and the constant-voltage emission module (3) work.
4. The integrated measurement system for high-power constant-voltage electromagnetic emission according to claim 1, wherein the high-power electromagnetic emission control system adopts a constant-current mode when the grounding condition is good, and adjusts and controls the output current of the high-power generator (1) in real time through the excitation regulator (4) according to the impedance and the working current of the preset frequency;
if the load is overlarge and the emission current is reduced, then the phase-shifting trigger pulse of the excitation regulator (4) moves forward, the conduction time of the controllable silicon is increased, the excitation current is increased, the output voltage of the high-power generator (1) is increased, the load current is increased, otherwise, the voltage of the generator is reduced, the current is reduced, and the output load current of the generator is kept constant;
when the grounding condition is poor, a constant voltage mode is adopted, fixed voltage is set by using an excitation control device according to impedance and working current with preset frequency, and the purpose of outputting current signals is achieved by stabilizing higher voltage.
5. A high power constant voltage electromagnetic emission integrated measurement system according to claim 1, characterized in that the excitation current signal (5) is embodied as two kinds of current square wave signals.
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