CN109358217B - Mobile large-current impulse generator - Google Patents
Mobile large-current impulse generator Download PDFInfo
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- CN109358217B CN109358217B CN201811427379.9A CN201811427379A CN109358217B CN 109358217 B CN109358217 B CN 109358217B CN 201811427379 A CN201811427379 A CN 201811427379A CN 109358217 B CN109358217 B CN 109358217B
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Abstract
The invention discloses a mobile large-current impact generator which comprises a power supply, an integrated charging device, an impact generator body, a measurement and acquisition unit, a tested product and a control unit, wherein the power supply is connected with the integrated charging device; the shock generator body comprises main capacitors which are distributed in an H shape and are not less than 8 stages, and the lowest layer of the shock generator body is set as a first stage; the impulse generator body comprises eight main capacitors, four discharging ball gaps, a charging resistor, a wave head resistor and a wave tail resistor. The device has the advantages that the volume and the weight of the device are reduced while insulation requirements are ensured, the transportation and the movement are convenient, and the economy and the reliability of a field test are improved; the operation is simple, and the automatic control of charging, discharging, data acquisition and storage is realized through a computer; the method is safe and reliable, and different electric potentials are safely isolated by measures such as an isolation transformer and optical fiber transmission.
Description
Technical Field
The invention relates to the technical field of high-voltage tests of power systems, in particular to a mobile large-current impact generator.
Background
Grounding is an important measure for maintaining safe and reliable operation of the power system and ensuring the safety of electrical equipment and operating personnel, and is an important link of the power system. In some areas, special soil zones such as a large amount of frozen soil, wind sand and the like exist, the soil resistivity is high, and the influence of seasons, climates and environments is large. When grounding devices of a transformer substation and a power transmission line are in severe soil conditions, the current dispersion effect of a grounding body is greatly influenced, so that the grounding impedance is higher, the grounding reliability of a power system is greatly reduced, and the safe and stable operation of a power grid is seriously threatened. On the other hand, with the continuous improvement of the voltage grade of the power system, in order to ensure the safe and reliable operation of the power system and the personal safety of the staff of the transformer substation, the power supply stability of the power transmission line is improved, and the grounding impedance of the grounding devices of the transformer substation and the circuit tower is required to be smaller and smaller. Therefore, it is necessary to carry out an in-depth study on the resistance reduction measures of the grounding device under the special soil geological conditions in some regions and provide a corresponding solution, so as to improve the operation performance of the grounding device and improve the safety and stability performance of the power grid.
When a tower or a lightning conductor is struck by lightning to form counterattack overvoltage, the phenomena of inductance effect, spark effect and the like are caused because impact heavy current flows through the grounding device and the soil, so that the impact grounding impedance is greatly different from the power frequency grounding impedance. Therefore, the field lightning impulse test of the grounding device must be carried out by simulating lightning current, and the impulse response and characteristic parameters of the ground grid are tested to determine the optimal grounding scheme and avoid lightning accidents.
In order to make the output impulse current as close as possible to the real situation that the grounding device is subjected to lightning impulse, the impulse current generator should be capable of outputting the impulse current with the amplitude of up to ten kA under the load of a grounding resistor of a plurality of omega. Patent ZL 201220348044.X discloses a high-voltage large-current impact current generator, which comprises four impact current generators, a charging loop and four discharging loops, wherein the four impact current generators are distributed symmetrically, the four impact current generators are charged simultaneously and synchronously discharged, and the lightning current wave impact current with the peak value of 100kA can be generated under a certain load condition (the impedance is less than 4 Ω). But it is non-movable, can not realize the field measurement of the transmission line shaft tower of different positions.
Patent ZL 201610012468.1 discloses a 100kA lightning current generator for testing the impact characteristics of a grounding device, which can output a lightning current with a maximum voltage of 1200kV, a lightning current peak value of 100kA, and a waveform of 8/20 μ s or 2/10 μ s under the condition that a load is greater than 5 Ω, and can be applied to the aspects of testing the impact impedance of the grounding device, researching the phenomenon of soil spark discharge, testing the high-current impact resistance of a grounding material, testing the electromagnetic compatibility of the grounding material, and the like. However, the whole device of the patent is huge in size and heavy in weight, and is not beneficial to being transported to a line site for impact property test; meanwhile, the function is single, the impact current wave is mainly generated, and the function requirements of other tests such as an impact voltage generator and the like can not be realized through convenient conversion.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a mobile large-current impact generator which comprises a power supply, an integrated charging device, an impact generator body, a measurement and acquisition unit, a tested product and a control unit.
The power supply is used for supplying power for the integrated charging device, the impact generator body, the measurement and acquisition unit, the tested product and the control unit and comprises an incoming and outgoing line switch cabinet, a generator set and an isolation transformer.
The integrated charging device is used for charging the impulse generator body and comprises a controlled silicon Kg, a rectifier silicon stack D, a test transformer T, a transformer series resistor Rd, a charging protection resistor Re and a direct current resistor divider Rm, wherein the controlled silicon Kg, the rectifier silicon stack D, the test transformer T, the transformer series resistor Rd, the charging protection resistor Re and the direct current resistor divider Rm are electrically connected through a control cable.
The measurement acquisition unit comprises a measurement sensor and an oscilloscope and is used for measuring voltage and current signals of the tested object and transmitting the voltage and current signals of the tested object to a computer console in an optical fiber or wireless mode.
The control unit comprises a silicon controlled voltage regulating device, a functional circuit and a programmable controller; the charging device is used for controlling and setting the charging voltage, the charging time, the discharging ball distance of the impact generator body, the triggering mode and the polarity switching of the integrated charging device.
The generator set is connected with the input end of the isolation transformer, the output end of the isolation transformer is connected with the input end of the integrated charging device, and the output end of the integrated charging device is connected with the input end of the impulse generator body; the measurement acquisition unit is electrically connected with the tested object through a cable; the tested object and the control unit are electrically connected with the generator body through cables.
The impact generator body includes: the first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 are distributed in an H shape; a first discharge ball gap Sp1, a second discharge ball gap Sp2, a third discharge ball gap Sp3, and a fourth discharge ball gap Sp4; a charging resistance Rc, a wave head resistance Rf and a wave tail resistance Rt; and setting the lowest layer of the impact generator body as a first stage.
The first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 are connected in parallel, the first discharge ball gap Sp1 is connected between parallel circuits of the first main capacitor C1 and the second-stage main capacitor C2, the second discharge ball gap Sp2 is connected between parallel circuits of the third-stage main capacitor C3 and the fourth-stage main capacitor C4, the third discharge ball gap Sp3 is connected between parallel circuits of the fifth-stage main capacitor C5 and the sixth-stage main capacitor C6, and the fourth discharge ball gap Sp4 is connected between parallel circuits of the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8.
The other sides of the parallel circuits of the first-stage main capacitor C1 and the second-stage main capacitor C2, the parallel circuits of the third-stage main capacitor C3 and the fourth-stage main capacitor C4, the parallel circuits of the fifth-stage main capacitor C5 and the sixth-stage main capacitor C6, and the parallel circuits of the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 are respectively connected with a tail resistor Rt in series.
The wave head resistor Rf is respectively connected in series between the first-stage main capacitor C1 and the ground, between the second-stage main capacitor C2 and the third-stage main capacitor C3 in parallel loop, between the fourth-stage main capacitor C4 and the fifth-stage main capacitor C5 in parallel loop, and between the sixth-stage main capacitor C6 and the seventh-stage main capacitor C7 in parallel loop, and the wave head resistor Rf and the wave tail resistor Rt are arranged on the same side of the first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 in parallel loop.
The charging resistor Rc is connected in series between the parallel circuits of the even-numbered stage main capacitors and between the parallel circuits of the odd-numbered stage main capacitors.
The main capacitor is a dry pulse capacitor and is made of a composite film insulating material.
One end of the first-stage main capacitor C1 and one end of the second-stage main capacitor C2 are electrically connected with the direct-current resistor voltage divider in series at the same side as the charging resistor Rc; one end of the first discharging ball gap Sp1 is electrically connected with the output end of the charging transformer, and the input end of the testing transformer is connected to the control unit.
The main capacitance is 4.8 muF/150 kV, and two capacitance steps of 1.8 muF and 3 muF are included and can be selected according to different test requirements.
One end of the second-stage main capacitor C2 is connected with a detection pulse voltage divider, and the detection pulse voltage divider is connected to a control unit and used for judging the ignition time of the impact generator body for the wave chopping device.
Further, according to different current and voltage waveforms and amplitudes required by tests, the high-voltage output end is connected to an intersection point of the eighth-stage main capacitor C8 and the wave tail resistor Rt, an intersection point of the sixth-stage main capacitor C6 and the wave tail resistor Rt, an intersection point of the fourth-stage main capacitor C4 and the wave tail resistor Rt, or an intersection point of the second-stage main capacitor C2 and the wave tail resistor Rt.
The test transformer is an oil immersed transformer, and the rectifier silicon stack is arranged in the oil immersed transformer, so that the space size is effectively reduced.
The wave head resistor Rf and the wave tail resistor Rt both adopt a double-layer non-inductive winding mode, the positions of the wave head resistor Rf and the wave tail resistor Rt in a circuit can be interchanged, and the wave head resistor Rf can be replaced by a wave regulating inductor or adopt a short-circuit mode.
The beneficial effects of the invention are: the mobile multifunctional large-current impact generator can be used for large-current impact tests of grounding devices, and can generate lightning impact current with the waveform of 8/20 muS and the peak value of not less than 40kA when the load is several ohms; the device can also be applied in other aspects, including development of a residual voltage test of the lightning arrester, can meet the requirements of the residual voltage test of the whole lightning arrester of 35-110 kV, can be used as an impulse voltage generator and the like. By adopting a compact container type integrated structural design, the volume and the weight of the device are reduced while the insulation requirement is ensured, the vehicle-mounted movement of the device is realized, the transportation and the movement are convenient, and the economy and the reliability of a field test are improved; the operation is simple, and the automatic control of charging, discharging, data acquisition and storage is realized through a computer; the method is safe and reliable, and different electric potentials are safely isolated by measures such as an isolation transformer and optical fiber transmission.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a schematic diagram of a generator body circuit of the disclosed embodiment 1 of the invention;
fig. 2 is an overall circuit configuration diagram of embodiment 1 of the present disclosure;
fig. 3 is a circuit configuration diagram of a generator body according to embodiment 1 of the present disclosure;
fig. 4 is a schematic block diagram of a computer measurement and control system according to embodiment 1 of the present disclosure.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic circuit diagram of a current surge generator according to the present invention, and fig. 2 is a schematic circuit diagram of an overall circuit structure of the embodiment 1 of the present invention:
wherein Kg is controlled silicon; t is a test transformer; d is a rectifying silicon stack; rd is a series resistor of the transformer; re is a charging protection resistor; rm1 and Rm2 are direct current resistance voltage dividers; C1-C8 are main capacitors; sp1-Sp4 are discharge ball gaps; rc is a charging resistor; rf is a ripple resistance; rt is the wave tail resistance; rs is a wave-modulating resistor; f is a test sample; s is a current sensor; ce is a voltage divider; kg is controlled silicon; t is a test transformer; d is a rectifying silicon stack; rd is a series resistor of the transformer; re is a charging protection resistor; cm1 and Cm2 are detection pulse voltage dividers.
A mobile large-current impulse generator comprises a power supply, an integrated charging device, an impulse generator body, a measurement and acquisition unit, a tested product and a control unit.
And the power supply is used for supplying power to the integrated charging device, the impact generator body, the measurement acquisition unit, the tested product and the control unit, and comprises an incoming and outgoing line switch cabinet, a generator set and an isolation transformer.
The integrated charging device is used for charging the impulse generator body and comprises a controlled silicon Kg, a rectifier silicon stack D, a test transformer T, a transformer series resistor Rd, a charging protection resistor Re and a direct current resistor divider Rm, wherein the controlled silicon Kg, the rectifier silicon stack D, the test transformer T, the transformer series resistor Rd, the charging protection resistor Re and the direct current resistor divider Rm are electrically connected through a control cable.
And the measurement acquisition unit comprises a measurement sensor and an oscilloscope and is used for measuring the voltage and current signals of the tested object and transmitting the voltage and current signals of the tested object to the computer console in an optical fiber or wireless mode.
The control unit comprises a silicon controlled voltage regulator, a functional circuit and a programmable controller; the charging device is used for controlling and setting the charging voltage, the charging time, the discharging ball distance of the impact generator body, the triggering mode and the polarity switching of the integrated charging device.
The generator set is connected with the input end of the isolation transformer, the output end of the isolation transformer is connected with the input end of the integrated charging device, and the output end of the integrated charging device is connected to the input end of the impulse generator body; the measurement acquisition unit is electrically connected with the tested product through a cable; the tested object and the control unit are electrically connected with the generator body through cables.
The power supply is controlled by a switch cabinet with an inlet and outlet wire, and the switch cabinet, the isolation transformer and the generator set form a power supply system. The generator is also provided with accessories such as a power supply battery, a rainproof outer cover and the like; the isolation variable capacity is 100kVA, and the voltage resistance of the single-side output pole to the shell and the secondary side can resist 300kV lightning impulse.
In order to ensure the field test, a set of generator set is provided to provide a power supply for the equipment to work. The power of the generator set is slightly larger than that of the test transformer T, and a 30kW diesel generator set is selected. Meanwhile, corresponding accessories are configured in consideration of the working conditions of the site, including a power supply battery, a rainproof cover and the like.
The impact generator takes the bottom of the container as a base and is in modular design. The power supply system, the charging device, the impact generator body and the control cabinet are all fixed on the base. The capacitor tower is divided into two groups, each group is provided with two layers of capacitors, and the capacitor tower can be used according to 600kV of a single group or can be overlapped into 1200kV for use. The equipment connection adopts a quick coupling mode, is convenient to operate, has a lifting point and is convenient to lift. The base is provided with the hydraulic device, so that the base can be lifted, and the base is ensured to be insulated from the ground. The height between the equipment and the whole container is not more than 2.7 meters, so that the equipment can conveniently pass through special road sections such as tunnels, bridge openings and the like during vehicle-mounted transportation.
Because the generator directly tests the pole tower grounding electrode and the ground, the ground potential lifting generated in the test is much higher than that of a common test room, and in order to prevent the damage of the ground potential in the test, an isolation transformer is arranged between the generator and the body of the impact current generator and is used as the intermediate protection of the power supply and the impact current generator. The lightning impulse withstand voltage of the single-side output pole of the isolation transformer to the shell and the secondary side reaches 300kV.
The charging loop is formed by electrically connecting a thyristor Kg, a test transformer T, a transformer series resistor Rd, a charging protection resistor Re, a direct current resistor divider Rm and a control cable. The high-voltage test transformer T is 380V/120KV, the capacity is 25kVA, and the series resistance Rd of the transformer is 1.25 omega. The rectifier silicon stack D is 300KV/0.5A, and the direct current resistance divider Rm is 300M omega/5M omega.
The impulse generator body adopts bilateral symmetry charge mode, adopts H type structure, is formed by level four capacitor series connection, and every level capacitor comprises 2 condenser series connections, and every layer of charging voltage is 300kV. The rated energy of the generator is 432kJ, and the nominal voltage of the generator is +/-1200 kV. The main capacitor is a dry pulse capacitor, the composite film is insulated, the volume is small, the weight is light, and the inherent inductance of the capacitor is less than 0.2 muH. Each capacitor is 4.8 muF/150 kV, comprises two capacitance steps of 1.8 muF and 3 muF, and can be flexibly selected according to different test requirements. The silicon controlled rectifier regulates voltage at constant current, and the voltage from zero to the setting voltage is continuously adjustable. The charging power supply is automatically turned off at the moment of ignition and discharge, and the safety of the charging transformer and the voltage regulating system is protected. The rectifier silicon stack is arranged in the oil immersed transformer to form a charging and rectifying integrated device, so that the effective space size can be reduced.
As shown in fig. 3, the circuit structure of the generator body according to the embodiment 1 of the present disclosure includes 8 main capacitors C1 to C8,4 discharging gaps Sp1 to Sp4,6 charging resistors Rc,4 wave head resistors Rf,4 wave tail resistors Rt, and a wave modulating resistor Rs. Two ends of the discharge ball gap Sp1 are respectively connected to an end point 1 of the main capacitor C1 and an end point 3 of the main capacitor C2; two ends of the discharge ball gap Sp2 are respectively connected to an end point 5 of the main capacitor C3 and an end point 7 of the main capacitor C4; both ends of the discharge ball gap Sp3 are connected to the end 9 of the main capacitor C5 and the end 11 of the main capacitor C6, respectively; both ends of the discharge ball gap Sp4 are connected to the end point 13 of the main capacitor C7 and the end point 15 of the main capacitor C8, respectively. And a wave tail resistor Rt, a small resistor and a small gap are connected between the two main capacitors of each stage in parallel, so that the synchronization of the equipment is enhanced. The interstage Rf is provided with a parallel coupling capacitor, so that the operating wave efficiency and the equipment synchronization can be improved. Clamping resistors are arranged in all the spherical gaps, the capacity is not less than 10W, and the stability of discharge every time is guaranteed.
The end points 1 and 3 of the main capacitor C1 and C2 are connected with direct current resistor voltage dividers Rm1 and Rm2, and are connected to a control unit through control cables for regulation and control. And monitoring the charging voltage on the main capacitor by using the direct current resistance voltage divider, and sending a charging end instruction when the charging voltage reaches a specified value, so that the charging is finished. Meanwhile, the discharge ball gap Sp1 is connected to the trigger unit through an RC series circuit by a triggering conduction method, and the conduction of the discharge ball gap Sp1 is controlled by the trigger unit. And an end point 4 of the main capacitor C2 is connected with detection pulse voltage dividers Cm1 and Cm2, and is connected to the control unit for judging the ignition time of the body for the chopping device.
The wave head resistor and the wave tail resistor can be interchanged in geometric dimension, and a double-layer non-inductive winding mode is adopted. Different parameters are matched in different tests, the wave head resistor can be placed at the wave head position, the wave modulating inductor can also be placed at the wave head position, and the wave modulating inductor can also be in short circuit. Each stage of support can be provided with a plurality of resistors and short circuit rods. The wave regulating device can bear the 8/20 muS impact current waveform of rated 40kA and can not be damaged by the electrodynamic force.
As shown in fig. 4, the computer measurement and control system according to embodiment 1 of the present disclosure is a schematic block diagram, wherein the measurement and acquisition unit 404 is composed of a measurement sensor and a digital oscilloscope, and the control unit 403 is composed of a Programmable Logic Controller (PLC), a silicon controlled voltage regulator, and a functional circuit. The computer operation unit 405 includes a photoelectric conversion device, a measurement industrial personal computer, a control industrial personal computer, and a printer.
The measuring current sensor adopts a Rogowski coil, and the nominal current is 50kA. The measuring voltage sensor adopts a weak damping capacitive voltage divider, consists of two MWF800-600 type pulse capacitors and is resistant to voltage of 1200kV. The measured current and voltage signals are transmitted to an oscilloscope through a cable, and the signals on the oscilloscope are transmitted to the computer operation unit 405 through optical fibers or in a wireless mode. The computer operation unit 405 communicates with the PLC through optical fiber transmission, and the computer operation unit 405 is not directly electrically connected with the control cabinet and the measuring device, so that the safety of operators is guaranteed. The industrial control professional software is used for programming and designing a control working interface which is convenient to operate, and the running parameters and the measurement results of the system are displayed on a computer interface in a digital quantity mode in real time. All parameters of the impact system such as setting, running, measuring and the like can be completed on a computer, including setting of charging voltage, charging time, discharging ball distance, triggering mode, automatic polarity switching and the like, and the running state of the impact system is monitored and measured. The system has the functions of manual control, computer control, manual measurement, automatic measurement and the like, and the functions are relatively independent and are mutually supplemented, so that the reliability of the system is ensured.
The main capacitor in the generator body 401 adopts a dry pulse capacitor, and has small volume and light weight, and the inherent inductance of the capacitor is less than 0.2 muH. Each capacitor has two capacitance steps of 1.8 muF and 3 muF, and can be selected according to different experiments.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and for example, the division of the units or modules is only one type of logical function division, and other divisions may be realized in practice, for example, a plurality of units or modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between modules or units, and may be in an electrical or other form.
The units or modules described as separate parts may or may not be physically separate, and parts displayed as units or modules may or may not be physical units or modules, may be located in one place, or may be distributed on a plurality of network units or modules. Some or all of the units or modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional units or modules in the embodiments of the present application may be integrated into one processing unit or module, or each unit or module may exist alone physically, or two or more units or modules are integrated into one unit or module. The integrated unit or module may be implemented in the form of hardware, or may be implemented in the form of a software functional unit or module.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, or portions or all or portions of the technical solutions that contribute to the prior art, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (8)
1. A mobile large-current impulse generator is characterized by comprising a power supply, an integrated charging device, an impulse generator body, a measurement and acquisition unit, a tested product and a control unit;
the power supply is used for supplying power to the integrated charging device, the impact generator body, the measurement acquisition unit, the tested product and the control unit and comprises an incoming and outgoing line switch cabinet, a generator set and an isolation transformer;
the integrated charging device is used for charging the impulse generator body and comprises a controlled silicon Kg, a rectifier silicon stack D, a test transformer T, a transformer series resistor Rd, a charging protection resistor Re and a direct current resistor divider Rm, wherein the controlled silicon Kg, the rectifier silicon stack D, the test transformer T, the transformer series resistor Rd, the charging protection resistor Re and the direct current resistor divider Rm are electrically connected through a control cable;
the measurement acquisition unit comprises a measurement sensor and an oscilloscope and is used for measuring voltage and current signals of the tested object and transmitting the voltage and current signals of the tested object to a computer console in an optical fiber or wireless mode;
the control unit comprises a silicon controlled voltage regulating device, a functional circuit and a programmable controller; the charging device is used for controlling and setting the charging voltage, the charging time, the discharging ball distance of the impact generator body, the triggering mode and the polarity switching of the integrated charging device;
the generator set is connected with the input end of the isolation transformer, the output end of the isolation transformer is connected with the input end of the integrated charging device, and the output end of the integrated charging device is connected with the input end of the impulse generator body; the measurement acquisition unit is electrically connected with the tested object through a cable; the tested product and the control unit are electrically connected with the generator body through cables;
the impact generator body includes: the first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 are distributed in an H shape; a first discharge ball gap Sp1, a second discharge ball gap Sp2, a third discharge ball gap Sp3, and a fourth discharge ball gap Sp4; a charging resistance Rc, a wave head resistance Rf and a wave tail resistance Rt; setting the lowest layer of the impact generator body as a first stage;
the first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 are connected in parallel, the first discharge ball gap Sp1 is connected between parallel loops of the first-stage main capacitor C1 and the second-stage main capacitor C2, the second discharge ball gap Sp2 is connected between parallel loops of the third-stage main capacitor C3 and the fourth-stage main capacitor C4, the third discharge ball gap Sp3 is connected between parallel loops of the fifth-stage main capacitor C5 and the sixth-stage main capacitor C6, and the fourth discharge ball gap Sp4 is connected between parallel loops of the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8;
one side of a parallel loop between the first-stage main capacitor C1 and the second-stage main capacitor C2, a parallel loop between the third-stage main capacitor C3 and the fourth-stage main capacitor C4, a parallel loop between the fifth-stage main capacitor C5 and the sixth-stage main capacitor C6, and a parallel loop between the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 is respectively connected with a tail resistor Rt in series;
the wave head resistor Rf is respectively connected in series between the first-stage main capacitor C1 and the ground, between the second-stage main capacitor C2 and the third-stage main capacitor C3 in a parallel loop, between the fourth-stage main capacitor C4 and the fifth-stage main capacitor C5 in a parallel loop, and between the sixth-stage main capacitor C6 and the seventh-stage main capacitor C7 in a parallel loop, and the wave head resistor Rf and the wave tail resistor Rt are arranged on the same side of the first-stage main capacitor C1, the second-stage main capacitor C2, the third-stage main capacitor C3, the fourth-stage main capacitor C4, the fifth-stage main capacitor C5, the sixth-stage main capacitor C6, the seventh-stage main capacitor C7 and the eighth-stage main capacitor C8 in a parallel loop;
and the charging resistor Rc is connected between the parallel circuits of the main capacitors of the even-numbered stages and between the parallel circuits of the main capacitors of the odd-numbered stages in series.
2. The mobile high-current impulse generator of claim 1, wherein said main capacitor is a dry pulse capacitor and is made of a composite film insulating material.
3. The mobile high-current impulse generator of claim 1, wherein one end of said first stage main capacitor C1, one end of said second stage main capacitor C2 and the same side of said charging resistor Rc are electrically connected in series to said dc resistor divider Rm;
one end of the first discharging ball gap Sp1 is electrically connected with the output end of the test transformer T, and the input end of the test transformer T is connected to the control unit.
4. The mobile high-current impulse generator of claim 1, wherein said main capacitor has a capacity of 4.8 μ F/150kV, and comprises two capacitance levels of 1.8 μ F and 3 μ F, which can be selected according to different experimental requirements.
5. The mobile high-current surge generator according to claim 1, wherein one end of the second-stage main capacitor C2 is connected to a detection pulse voltage divider, and the detection pulse voltage divider is connected to a control unit for determining the ignition time of the surge generator body for the chopper device.
6. The mobile high-current surge generator according to claim 1, wherein the high-voltage output terminal is selected to be connected to the intersection point of the eighth stage main capacitor C8 and the wave tail resistor Rt, or the intersection point of the sixth stage main capacitor C6 and the wave tail resistor Rt, or the intersection point of the fourth stage main capacitor C4 and the wave tail resistor Rt, or the intersection point of the second stage main capacitor C2 and the wave tail resistor Rt according to the current and voltage waveforms and amplitudes required by the test.
7. The mobile high-current impulse generator of claim 1, wherein said test transformer T is an oil-immersed transformer, and said rectifier silicon stack D is disposed in said oil-immersed transformer to effectively reduce the size of the space.
8. The mobile high-current surge generator according to claim 1, wherein the wave head resistance Rf and the wave tail resistance Rt are wound in a double-layer non-inductive manner.
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| CN110707672B (en) * | 2019-09-10 | 2021-01-15 | 西安交通大学 | Counterattack voltage protection device of compact high-capacity lightning generating device trigger system |
| CN113960434B (en) * | 2021-09-26 | 2024-02-09 | 许继集团有限公司 | Gate valve abrupt slope front surge voltage test circuit and test method thereof |
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