CN113064010A - Electromagnetic interference simulation device - Google Patents
Electromagnetic interference simulation device Download PDFInfo
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- CN113064010A CN113064010A CN202110320656.1A CN202110320656A CN113064010A CN 113064010 A CN113064010 A CN 113064010A CN 202110320656 A CN202110320656 A CN 202110320656A CN 113064010 A CN113064010 A CN 113064010A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The invention discloses an electromagnetic interference simulation device, comprising: the device comprises a direct-current power supply, a three-electrode switch, an equivalent resistor, a discharge capacitor, an adjustable inductor and a trigger source; the anode of the direct current power supply is connected with one end of an equivalent resistor, and the other end of the equivalent resistor is connected with one end of a discharge capacitor and the anode of the three-electrode switch; the cathode of the three-electrode switch is connected with one end of the adjustable inductor; the high-voltage end of the trigger source is connected with the trigger pole of the three-pole switch; the other end of the adjustable inductor and the other end of the discharge capacitor are connected with the negative electrode of the direct-current power supply and the grounding end of the trigger source. The invention has the advantages of adjustable voltage, frequency and polarity of the pulse power supply; in addition, a mode of triggering a source to conduct a three-electrode switch to generate a pulse signal is adopted, so that the technical defect of short gas insulation recovery time can be overcome.
Description
Technical Field
The invention belongs to the technical field of electromagnetic interference, and particularly relates to an electromagnetic interference simulation device.
Background
In recent years, a high-voltage converter station has a failure of a primary system due to electromagnetic interference of a secondary system. If the secondary equipment has problems, the online monitoring equipment cannot find the problems or the monitoring data has low precision, so that technicians cannot pay enough attention to the problems, and small hidden dangers of the primary equipment are often developed into accidents of the primary equipment; the problem of partial discharge does not exist in primary equipment, abnormal data frequently occur in the online monitoring equipment, and technical personnel are misled to carry out unnecessary power failure maintenance, so that the waste of manpower, material resources and financial resources is caused, and the stability and the reliability of the operation of a power grid are influenced.
Due to the complex electromagnetic interference environment of the converter station, the technology for detecting and monitoring electromagnetic interference also meets the technical development bottleneck, missed alarm and false alarm are generally exposed, and authoritative statistics shows that more than 90% of alarms are false alarms, and the basis of the alarm is the interference identification capability and the anti-interference level of the current state detection device, so that the current state detection device is far not suitable for the complex electromagnetic environment of the transformer station site. How to suppress these complex interference signals overlapping with the partial discharge signal in frequency band and improve the detection sensitivity becomes a bottleneck in the field application of the state detection technology. Therefore, the calibration work for the anti-interference capability and the interference identification capability of the state detection product is particularly important.
At present, for the research of transient electromagnetic interference simulation disturbance sources of a converter station, a disconnecting switch simulation disturbance source is mainly adopted, and the disconnecting switch simulation disturbance source is a method for researching the immunity performance test of an electronic transformer, namely, a technology of utilizing a vacuum circuit breaker to divide and close a spherical gap arc to simulate a disconnecting switch is utilized, so that the rapid arc starting and extinguishing are realized, the arc burning is accurately controlled, the problem of a control method of a discharge gap arc process is solved, but the number of channels of the traditional disconnecting switch transient electromagnetic interference source is small; further, the insulation recovery time of the gas switch is long, and the insulation of the gas switch may not be completely recovered within 10 ms.
In summary, a new electromagnetic interference simulation device based on multi-pulse antenna radiation is needed.
Disclosure of Invention
The present invention is directed to an electromagnetic interference simulator, which solves one or more of the problems set forth above. The device has the advantages of adjustable voltage, frequency and polarity of the pulse power supply; the method of generating the pulse signal by adopting the mode of switching on the three-electrode switch by the trigger source can avoid the defect of short gas insulation recovery time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an electromagnetic interference simulation device, comprising: the device comprises a direct-current power supply, a three-electrode switch, an equivalent resistor, a discharge capacitor, an adjustable inductor and a trigger source;
the anode of the direct current power supply is connected with one end of the equivalent resistor, and the other end of the equivalent resistor is connected with one end of the discharge capacitor and the anode of the three-electrode switch; the cathode of the three-electrode switch is connected with one end of the adjustable inductor;
the high-voltage end of the trigger source is connected with the trigger pole of the three-pole switch;
the other end of the adjustable inductor and the other end of the discharge capacitor are connected with the negative electrode of the direct-current power supply and the grounding end of the trigger source.
A further improvement of the invention is that the three-electrode switch is a single-channel three-electrode switch.
A further improvement of the invention is that the three-electrode switch is a multi-channel three-electrode switch.
The invention further improves the method and also comprises the following steps: a high-gain broadband log periodic antenna; the high-gain broadband log periodic antenna is connected with the cathode of the three-electrode switch.
The invention is further improved in that the frequency range of the high-gain broadband log-periodic antenna is as follows: 30M to 3000 MHz; polarization: linearity; polarization isolation: greater than 20 dB; rated impedance: 50 omega; standing waves: more than 200MHz is less than 1.5, 50-200MHz is less than 4, and 30-50MHz is less than 10; input power: 200W; gain: 10 dB; an RF connector: and N holes.
The invention further improves the method and also comprises the following steps: a GIS equipment shell grounding resistor; and the grounding resistor of the GIS equipment shell is connected in series between the adjustable inductor and the three-electrode switch.
The invention has the further improvement that the direct current power supply is a 50kV direct current power supply; the three-electrode switch is a four-channel three-electrode switch, and the working frequency of a single channel is 50 Hz; the self-breakdown voltage of the three-electrode switch is 70-80 kV.
The invention is further improved in that the trigger source has 4 paths of outputs which are respectively used for triggering 4 three-electrode switches, the pulse repetition frequency of each path is 50Hz, and the trigger pulse output delay between adjacent channels is 5 ms.
A further development of the invention is that the trigger source comprises: the device comprises a Marx main circuit, an IGBT driving circuit and an optocoupler input circuit; the Marx main circuit is used for driving the IGBT driving circuit; the IGBT driving circuit is triggered in an isolation mode; the optical coupler input circuit is used for driving the IGBT through an optical coupler.
The Marx main circuit is further improved in that the Marx main circuit is provided with an input voltage interface and an output end, the input voltage interface is connected with a direct current source, and the output end is connected with an IGBT driving circuit; the Marx main circuit is composed of 5 charge-discharge loops.
Compared with the prior art, the invention has the following beneficial effects:
the transient electromagnetic interference simulation disturbance source is generated by adopting a multi-signal injection mode, and has the advantages of adjustable voltage, frequency and polarity of a pulse power supply; the mode of generating the pulse signal by adopting the mode of switching on the four-channel electrode switch by the trigger source can avoid the defect of short gas insulation recovery time.
The invention detects the electromagnetic anti-interference performance of target equipment by the three-electrode switch and by generating simulated electromagnetic interference through the high-gain broadband log-periodic antenna or by directly connecting the high-gain broadband log-periodic antenna with GIS equipment and simulating the electromagnetic interference.
The invention adopts a trigger source to control a single-channel electrode switch, and is additionally provided with a high-gain broadband log-periodic antenna for directional transmission of signals.
The invention realizes the generation of the analog electromagnetic interference source through the multi-channel switch, and utilizes the advantages of short gas insulation recovery time of the multi-electrode switch and adjustable pulse of the voltage, the frequency and the polarity of the pulse power supply to simulate the electromagnetic interference source of the converter station. The insulation recovery time of the gas switch is in ms magnitude, 4 channels are connected in parallel, and the working frequency of a single channel is 50 Hz. The Marx circuit has the advantages of high switching speed, adjustable output, extremely short pulse rising edge or falling edge, capability of generating extremely strong pulse electric field impact and the like which are not possessed by the traditional Marx circuit by adopting the control of a trigger source.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of an apparatus for simulating electromagnetic interference based on multi-pulse antenna radiation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electromagnetic interference simulation apparatus based on multi-pulse antenna radiation according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a Marx circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an IGBT driving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical coupler input circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a simulation circuit according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a comparison of pulse current waveforms for different inductance values according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Aiming at transient electromagnetic interference of switching operation of a converter station, the invention develops a simulation disturbance source for simulating the transient electromagnetic interference of the converter station based on a multi-signal injection mode and provides a test method based on the simulation disturbance source; the device provided by the invention is of great help for researching electromagnetic interference of secondary equipment of the converter station.
The embodiment of the invention aims to realize the detection of the electromagnetic anti-interference performance of target equipment by a three-electrode switch and by generating simulated electromagnetic interference through a high-gain broadband log-periodic antenna or by directly connecting GIS equipment and simulating the electromagnetic interference.
Referring to fig. 1, an electromagnetic interference simulation apparatus based on multi-pulse antenna radiation according to an embodiment of the present invention is designed to generate a proper current waveform through trigger source control under a single-channel switch, and finally generate simulated electromagnetic interference through a high-gain wideband log-periodic antenna apparatus; wherein, the working frequency of the electrode switch is 50 Hz.
In the embodiment of the invention, the trigger source is adopted for control, so that the Marx circuit has the advantages of high switching speed, adjustable output, extremely short pulse rising edge or falling edge, extremely strong pulse electric field impact and the like which are not possessed by the traditional Marx circuit.
The electromagnetic interference simulation device based on multi-pulse antenna radiation comprises: the device comprises a main circuit, a single-channel electrode switch, an antenna, a trigger source and the like.
Wherein, the trigger source includes: the device comprises a Marx main circuit, a high-power IGBT drive circuit, an optical coupler input signal, an AC-DC power supply module and the like;
in the main circuit, a direct current power supply with the voltage value of 50kv supplies power, a capacitor C1 is a discharge capacitor, a resistor R1 is an equivalent resistor, and an inductor can be selected to be a proper adjustable inductor according to actual requirements.
In the embodiment of the invention, the single-channel electrode switch specifically adopts a single-channel three-electrode switch, but is not limited to a single channel and has the working frequency of 50 Hz.
And (3) turning on a switch: 3000A of current is required on the load, the charging voltage of the capacitor is 50kV, and therefore the self-breakdown voltage of the three-electrode trigger switch is designed to be 70-80 kV. The trigger electrode of the three-electrode switch is buried in the ground electrode. The trigger electrode is connected with the high-voltage end of the trigger source, and the cathode is connected with the grounding end of the trigger source.
In the embodiment of the invention, the triggering source is 1-path output and triggers 1 three-electrode switch, and the single-path frequency is 50 Hz. The high-voltage direct-current power supply supplies power through a 12V direct-current power supply, and a potentiometer is adopted to adjust the output voltage of the power supply. The input end of a Marx main circuit in the trigger source is connected to the output end of a high-voltage direct-current power supply, the output end of the Marx circuit is connected with an IGBT driving circuit, the trigger adopts isolation trigger, and the voltage of the isolation trigger is input by an AC220V-DC5V power supply module. The optical coupler input signal drives the IGBTs through optical couplings, and each IGBT adopts the driving mode. The isolated power module 5V converts 15V to supply power to the TLP 352. The IGBT driving circuit is powered by a 5V power supply. The optical coupler input circuit is connected to an AC220V input port, and 2-path 12V direct-current voltage is obtained through the AC-DC module. The 12V direct current voltage is divided into two paths: one path of action is that the 12V power supply that converts into 5V provides the electric current for the opto-coupler, and the output side of opto-coupler exports 15V high level, adopts resistance partial pressure to obtain 5V high level at R10 both ends, has the rising edge. The other way is to reduce the voltage of 12V to 5V through an AC-DC module to supply power for 74HC 123. Both ends of R10 are connected to 1B of 74HC123 and GND, and a rising edge is input to 74HC 123. The ports 74HC 12315 and 16 are connected with potentiometers, and the output pulse width is adjusted through adjusting the resistance of the potentiometers. The output pulse is divided into 6 paths, 5 paths are respectively connected to the optocoupler input ends of 5 IGBTs in the figure, and one path is used for detecting a trigger signal.
Referring to fig. 2, another electromagnetic interference simulation apparatus based on multi-pulse antenna radiation according to an embodiment of the present invention is directed to achieve generation of a simulated electromagnetic interference source through a multi-channel switch, and utilizes the advantages of short gas insulation recovery time of the multi-electrode switch and adjustable pulse of voltage, frequency and polarity of a pulse power supply to simulate an electromagnetic interference source of a converter station. The insulation recovery time of the gas switch is in ms magnitude, 4 channels are connected in parallel, and the working frequency of a single channel is 50 Hz. The Marx circuit has the advantages of high switching speed, adjustable output, extremely short pulse rising edge or falling edge, capability of generating extremely strong pulse electric field impact and the like which are not possessed by the traditional Marx circuit by adopting the control of a trigger source.
The electromagnetic interference simulation device based on multi-pulse antenna radiation comprises: main circuit, multi-channel electrode switch, antenna, trigger source, etc.
The trigger source includes: the device comprises a Marx main circuit, a high-power IGBT drive circuit, an optical coupler input signal, an AC-DC power supply module and the like;
in the main circuit, a direct-current power supply with the voltage value of 50kv supplies power, a capacitor C1 is a discharge capacitor, a resistor R1 is an equivalent resistor, a resistor R2 is an actual GIS equipment shell ground resistor, and an inductor can be selected to be a proper adjustable inductor according to actual requirements.
In the embodiment of the invention, a four-channel three-electrode switch is adopted, but the multi-channel three-electrode switch is not limited to four channels, and the repetition frequency is 200 Hz. 4 channels are adopted to be connected in parallel, and the working frequency of a single channel is 50 Hz. And (4) adopting a trigger source to control the conduction of each switch. 3000A of current is required on the load, the charging voltage of the capacitor is 50kV, and therefore the self-breakdown voltage of the three-electrode trigger switch is designed to be 70-80 kV. The trigger electrode of the three-electrode switch is buried in the ground electrode, the trigger electrode is connected with the high-voltage end of the trigger source, and the cathode is connected with the grounding end of the trigger source.
The triggering source is 4 paths of output and respectively triggers 4 three-electrode switches, the pulse repetition frequency of each path is 50Hz, and the triggering pulse output delay between adjacent channels is 5 ms. The high-voltage direct-current power supply supplies power through a 12V direct-current power supply, and a potentiometer is adopted to adjust the output voltage of the power supply. The input end of a Marx main circuit in the trigger source is connected to the output end of a high-voltage direct-current power supply, the output end of the Marx circuit is connected with an IGBT driving circuit, the trigger adopts isolation trigger, and the voltage of the isolation trigger is input by an AC220V-DC5V power supply module. The optical coupler input signal drives the IGBTs through optical couplings, and each IGBT adopts the driving mode. The isolated power module 5V converts 15V to supply power to the TLP 352. The IGBT driving circuit is powered by a 5V power supply. The optical coupler input circuit is connected to an AC220V input port, and 2-path 12V direct-current voltage is obtained through the AC-DC module. The 12V direct current voltage is divided into two paths: one path of action is that the 12V power supply that converts into 5V provides the electric current for the opto-coupler, and the output side of opto-coupler exports 15V high level, adopts resistance partial pressure to obtain 5V high level at R10 both ends, has the rising edge. The other way is to reduce the voltage of 12V to 5V through an AC-DC module to supply power for 74HC 123. Both ends of R10 are connected to 1B of 74HC123 and GND, and a rising edge is input to 74HC 123. The ports 74HC 12315 and 16 are connected with potentiometers, and the output pulse width is adjusted through adjusting the resistance of the potentiometers. The output pulse is divided into 6 paths, 5 paths are respectively connected to the optocoupler input ends of 5 IGBTs in the figure 2, and one path is used for detecting a trigger signal.
The transient electromagnetic interference simulation disturbance source is generated by adopting a multi-signal injection mode, and has the advantages of adjustable voltage, frequency and polarity of the pulse power supply. Furthermore, a mode of generating a pulse signal by adopting a mode of switching on a four-channel electrode switch by a trigger source is adopted, so that the defect of short gas insulation recovery time is avoided. Through the research of the project, the characteristic information of the electromagnetic interference of the high-voltage direct-current converter station is fully mastered, the scientific and reasonable secondary equipment immunity requirement is further provided, the measures for inhibiting the generation and the transmission of the electromagnetic interference are pertinently taken, and the technical support is provided for the electromagnetic compatibility design, the transformation, the safe and stable operation of the converter station.
The single-channel space electromagnetic interference simulation device provided by the embodiment of the invention has the working frequency of 50 HZ. The device is powered by a 50kV direct-current power supply, a trigger source is adopted to control a single-channel electrode switch, and a high-gain broadband log-periodic antenna is additionally arranged on the device and used for directional transmission of signals.
The four-channel space electromagnetic interference simulation device provided by the embodiment of the invention has the working frequency of 200 HZ. The device is powered by a 50kV direct-current power supply, a trigger source is adopted to control a four-way single-channel three-electrode switch, and the device can be directly connected with interfered equipment.
The electrode switch trigger electrode of the embodiment of the invention is buried in the ground electrode, the trigger electrode is connected with the high-voltage end of the trigger source, and the cathode is connected with the grounding end of the trigger source.
The high-gain broadband log-periodic antenna is used for directional transmission of signals, and comprises the following specific parameters:
frequency range: 30M-3000MHz, polarization: linear, polarization isolation: > 20dB, rated impedance: 50 Ω, standing wave: more than 200MHz is less than 1.5, 50-200MHz is less than 4, 30-50MHz is less than 10, input power: 200W (high gain), gain: 10dB, RF connector: and N holes.
Referring to fig. 3, in the trigger source according to the embodiment of the present invention, a detailed circuit diagram of the Marx circuit is shown in fig. 3, where P1 is an input voltage interface of the Marx circuit, and the input voltage interface is connected to a high voltage dc source. The circuit consists of 5 charge and discharge loops, wherein 10 diodes with the model number of STTH1210DY, 10 capacitors with the model number of 1uF, 1 resistor with the model number of 10 omega with the model number of AXIAL-1.5 and 5 IGBT elements with the model number of IRG4PH50UDPBF are adopted in the circuit.
Referring to fig. 4, in an embodiment of the invention, a detailed circuit diagram of an IGBT driving circuit in the trigger source is shown in fig. 4, where the IGBT driving circuit is driven by a Marx circuit. The IGBT triggering adopts isolation triggering, wherein H1 inputs 5V voltage, and the voltage is input by an AC220V-DC5V power module. H2 is an optical coupler input signal, the U1 model is an optical coupler of TLF352(F), H2 drives the IGBTs through U1, and each IGBT adopts the driving mode. U6 converts 5V to 15V for an isolated power module to supply power to TLP 352. H1 inputs 5V voltage and is obtained by an AC220V-DC5V4 power module.
Referring to FIG. 5, a detailed circuit diagram of the trigger source optical coupler input circuit according to the embodiment of the present invention is shown in FIG. 5, where P8 with model WJ2EDGVC-5.08-2P is the AC220V input port. And 2-path 12V direct-current voltage is obtained through an AC-DC module with the model number of HE12P24 LRN. The 12V direct current voltage is divided into an upper path and a lower path.
The upper circuit adopts an AC-DC module with the model number of HE12P24LRN, a fuse with the model number of U6 SRT1630A, an NTC thermistor element with the model number of R12, a piezoresistor with the model number of R11 14D471K, a filter with the model number of U7 NFM41PC155B1E3L, a zener diode with the model number of D3 SMBUS 20A, a BO515S-1W with the model number of U10 as VCC, a power supply module with the model number of U11 converted from 12V to 5V, and an optocoupler element with the model number of U9 as TLP350 (F).
The upper path of 12V is connected with a microswitch SW1 in series through two resistors of 470 omega, and provides current for the optical coupler. 7805 converts 12V voltage into 5V voltage, supplies power to B0515, and B0515 outputs 15V voltage as VCC of the optical coupler. When the micro switch is closed, a 15V high level is output from the 6 port of the output side of the optical coupler, and a 5V high level is obtained at two ends of R10 by adopting resistance voltage division and has a rising edge.
The lower circuit adopts an AC-DC module with the model number of HE12P24LRN, a fuse with the model number of U12 SRT1630A, an NTC thermistor element with the model number of R12, a piezoresistor with the model number of R13 14D471K, a filter with the model number of U8 NFM41PC155B1E3L, a zener diode with the model number of D4 SMBUS 20A, a CMOS power supply module with the model number of U13 for converting 12V into 5V, a CMOS oscillator with the model number of U14 CD74HC123, and a connector with the model number of P7/9 being Header-Male-2.54.
The lower circuit 12V supplies power to the 74HC123 by reducing the 12V voltage to 5V through 7805. Both ends of R10 are connected to 1B of 74HC123 and GND, and a rising edge is input to 74HC 123. The ports 74HC 12315 and 16 are connected with potentiometers, and the output pulse width is adjusted through adjusting the resistance of the potentiometers. The output pulse is divided into 6 paths, 5 paths are respectively connected to the optocoupler input ends of 5 IGBTs in the figure 2, and one path is used for detecting a trigger signal.
The specific simulation operation simulation method of the space electromagnetic interference simulation device comprises the following steps:
the pulse current waveform of the space electromagnetic interference simulation device is simulated, and a simulation circuit diagram is shown in fig. 6:
in the circuit diagram, C1 is a discharge capacitor, U1 is a switch, and a single three-electrode switch is simulated. R1 is the equivalent resistance, and L1 is the equivalent inductance. The current waveforms when the capacitance 1uF and the charging voltage 50kV were calculated, the resistance R1 was 5 Ω, the inductance L1 was 0.05mH, 0.1mH, 0.5mH, and 1mH, respectively, and the pulse current waveform chart was as shown in FIG. 7.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (10)
1. An electromagnetic interference simulation apparatus, comprising: the device comprises a direct-current power supply, a three-electrode switch, an equivalent resistor, a discharge capacitor, an adjustable inductor and a trigger source;
the anode of the direct current power supply is connected with one end of the equivalent resistor, and the other end of the equivalent resistor is connected with one end of the discharge capacitor and the anode of the three-electrode switch; the cathode of the three-electrode switch is connected with one end of the adjustable inductor;
the high-voltage end of the trigger source is connected with the trigger pole of the three-pole switch;
the other end of the adjustable inductor and the other end of the discharge capacitor are connected with the negative electrode of the direct-current power supply and the grounding end of the trigger source.
2. An emi simulation apparatus as set forth in claim 1, wherein said three-electrode switch is a single-channel three-electrode switch.
3. An emi simulation apparatus as set forth in claim 1, wherein said three-electrode switch is a multi-channel three-electrode switch.
4. An emi simulation apparatus as set forth in claim 1, further comprising: a high-gain broadband log periodic antenna;
the high-gain broadband log periodic antenna is connected with the cathode of the three-electrode switch.
5. The EMI modeling apparatus of claim 4, wherein the frequency range of said high-gain broadband log-periodic antenna is: 1M to 100 MHz; polarization: linearity; polarization isolation: greater than 20 dB; rated impedance: 50 omega; standing waves: more than 200MHz is less than 1.5, 50-200MHz is less than 4, and 30-50MHz is less than 10; input power: 200W; gain: 10 dB; an RF connector: and N holes.
6. An emi simulation apparatus as set forth in claim 1, further comprising: a GIS equipment shell grounding resistor;
and the grounding resistor of the GIS equipment shell is connected in series between the adjustable inductor and the three-electrode switch.
7. An electromagnetic interference simulating means according to claim 1 characterised in that the dc power supply is a 50kV dc power supply; the three-electrode switch is a four-channel three-electrode switch, and the working frequency of a single channel is 50 Hz; the self-breakdown voltage of the three-electrode switch is 70-80 kV.
8. An EMI simulation apparatus as claimed in claim 7, wherein the trigger source is 4 outputs for triggering 4 three-electrode switches respectively, the pulse repetition frequency of each output is 50Hz, and the trigger pulse output delay between adjacent channels is 5 ms.
9. An emi simulation apparatus as set forth in claim 1, wherein said trigger source comprises: the device comprises a Marx main circuit, an IGBT driving circuit and an optocoupler input circuit;
the Marx main circuit is used for driving the IGBT driving circuit; the IGBT driving circuit is triggered in an isolation mode;
the optical coupler input circuit is used for driving the IGBT through an optical coupler.
10. The electromagnetic interference simulation device of claim 7, wherein the Marx main circuit is provided with an input voltage interface and an output end, the input voltage interface is connected with a direct current source, and the output end is connected with the IGBT drive circuit;
the Marx main circuit is composed of 5 charge-discharge loops.
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Cited By (1)
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| CN110767978A (en) * | 2019-09-29 | 2020-02-07 | 西北核技术研究院 | Ultra-wide spectrum electromagnetic pulse radiation antenna |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113941A (en) * | 2021-11-25 | 2022-03-01 | 国网重庆市电力公司电力科学研究院 | Broadband pulse source circuit and transformer winding deformation detection device |
| CN114113941B (en) * | 2021-11-25 | 2023-07-14 | 国网重庆市电力公司电力科学研究院 | Broadband pulse source circuit and transformer winding deformation detection device |
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