CN114720779A - Phase-controllable bow net offline electromagnetic disturbance simulation system and test method - Google Patents
Phase-controllable bow net offline electromagnetic disturbance simulation system and test method Download PDFInfo
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- 238000010998 test method Methods 0.000 title claims abstract description 8
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- 238000012360 testing method Methods 0.000 claims abstract description 27
- 230000005672 electromagnetic field Effects 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 14
- 238000010891 electric arc Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 230000005670 electromagnetic radiation Effects 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
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- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
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Abstract
The invention discloses a phase-controllable bow net offline electromagnetic disturbance simulation system and a test method, wherein the system comprises a simulation device and a test device, the simulation device comprises an alternating current power supply, a phase controller and a simulation lifting device, and the test device comprises an antenna, an oscilloscope and a frequency spectrograph; the phase controller collects voltage signals between a contact wire and a pantograph which are measured by a voltage probe and current signals flowing between pantograph nets, judges the phase of the signals, sends out driving signals at a set phase to control the up-and-down motion of the pantograph, and sends triggering signals to the multi-channel oscilloscope.
Description
Technical Field
The invention relates to the technical field of train pantograph-catenary systems, in particular to a phase-controllable pantograph-catenary offline electromagnetic disturbance simulation system and a phase-controllable pantograph-catenary offline electromagnetic disturbance testing method.
Background
In the running process of the train, transient separation and contact phenomena between the pantograph and a contact network can be caused by the reasons of the irregularity, vibration and the like of the contact network, and the phenomenon is called pantograph-catenary off-line for short. The bow net off-line process is accompanied with arc discharge and discharge phenomena, and the electric arc can generate electromagnetic radiation to cause interference to peripheral signal equipment, control equipment and communication equipment. Because the research on the offline electromagnetic disturbance characteristics of the pantograph-catenary is difficult on site, a corresponding simulation device needs to be built for analysis and research in a laboratory.
The rated voltage of a contact network is 25kV, the current flowing through a pantograph under the conventional operation condition exceeds 200A, the high-voltage and high-current test condition is usually difficult to realize in a laboratory, and a high-voltage small-current or low-voltage high-current test device is usually adopted in general scientific research work to carry out offline characteristic research on the pantograph.
Such laboratory simulation devices generally suffer from the following problems:
1) the test device is used for singly simulating large-current breaking or high-voltage breakdown;
2) the contact and separation of the simulated bow net are random, and the voltage at the contact moment and the current at the separation moment can be in any phase of the power frequency;
3) the presence of ambient noise makes it difficult for the radiation measured by the antenna to correspond to the electromagnetic disturbance produced by the arcing discharge.
The traction power supply system adopts 50Hz alternating current, when the pantograph contacts with a contact network, the current flowing between the pantograph and the contact network is sine wave, when the pantograph and the contact network are separated, the voltage between the pantograph and the contact network is also sine wave, the period is 20ms, and as shown in figure 1:
when bow net separation occurs, the current may be at any phase of the sine wave; when the pantograph is re-contacted, the voltage may also be at any phase of the sine wave. Since different phases of the sine wave cause different instantaneous values of current or voltage, and thus different electromagnetic radiation characteristics of the generated arc, the phase is a non-negligible influence factor to study the electromagnetic disturbance characteristics of the pantograph-catenary offline arc. The existing research and test devices are all split and combined randomly, mainly research the statistical characteristics of electromagnetic disturbance, and are not beneficial to the comprehensive research on the characteristics of bow net off-line electromagnetic disturbance. In addition, the measurement of electromagnetic radiation is usually tested by adopting the maximum holding function of a spectrometer, and the influence of external environment interference is difficult to eliminate.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a phase-controllable bow net off-line electromagnetic disturbance simulation system which can be controlled in phase and can eliminate the influence of electromagnetic interference of the external environment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a controllable bow net off-line electromagnetism harassment analog system of phase place which characterized in that: the device comprises an analog device and a test device, wherein the analog device comprises an alternating current power supply, a phase controller and an analog lifting device, and the test device comprises an antenna, an oscilloscope and a frequency spectrograph;
the alternating current power supply can generate high-voltage small current and low-voltage large current which are respectively used for simulating high-voltage breakdown discharge and large-current arc discharge; the alternating current power supply is connected with the primary side of the voltage regulator, the secondary side of the voltage regulator is divided into two paths after passing through a selective switch S1, the first path is connected with the primary side of the boosting transformer and used for supplying power to the boosting transformer, and the second path is connected with the primary side of the step-down transformer and used for supplying power to the step-down transformer; the high-voltage end of the secondary side winding of the boosting transformer is connected with a contact wire of the analog lifting bow device after sequentially passing through a protective resistor R1 and a switch S2, and the low-voltage end of the secondary side winding of the boosting transformer is connected with a pantograph of the analog lifting bow device; the high-voltage end of the secondary side winding of the step-down transformer is connected with the contact wire of the analog pantograph lifting device after passing through a switch S3, and the low-voltage end of the secondary side winding of the step-down transformer is connected with the pantograph lifting device; the pantograph of the simulation pantograph lifting device can move up and down under the control of the stepping motor, so that the contact and the separation with the contact line are realized;
the phase controller acquires a voltage signal between the contact wire and the pantograph and a current signal flowing between the pantograph and the pantograph net measured by the voltage probe, judges the phase of the signals, sends out a driving signal at a set phase, controls the vertical movement of the pantograph through the analog pantograph lifting device, and realizes the contact and separation of the contact wire and the pantograph at the set phase; and simultaneously sending a trigger signal to a multi-channel oscilloscope, simultaneously acquiring a voltage signal between a contact wire and a pantograph, a current signal flowing between a pantograph net and an arc radiation electromagnetic wave signal received by an antenna, which are measured by a voltage probe, by the oscilloscope, and acquiring the electromagnetic radiation signal and an oscilloscope sampling signal by a frequency spectrograph for comparison analysis.
Correspondingly, the embodiment of the invention also discloses a phase-controllable bow net offline electromagnetic disturbance simulation test method, which is characterized by comprising the following steps: the test method uses the simulation system, and the method comprises the following steps:
when a high-voltage small-current test is carried out, a selector switch S1 is switched on, a control switch S2 is switched on, a switch S3 is switched off, a simulation pantograph lifting device is controlled to separate a contact line and a pantograph, a phase controller receives a voltage signal detected by a first voltage probe and carries out phase judgment, an antenna is placed at a specific distance close to the contact line and the pantograph, a multi-channel oscilloscope receives a voltage signal detected by a second voltage probe, a current signal detected by a second current probe and an electromagnetic field signal detected by the antenna, a frequency spectrograph receives the electromagnetic field signal detected by the antenna, the phase controller sends a driving signal to the simulation pantograph lifting device at a set phase of the voltage signal to enable the pantograph to move upwards to be in contact with the contact line and simultaneously sends a sampling trigger signal to the oscilloscope, and the test device detects the voltage current and the electromagnetic field signal when the contact line and the pantograph are in contact breakdown to generate an electric arc, the frequency spectrograph adopts maximum hold setting to collect maximum frequency domain signals in the electric arc process;
when a low-voltage large-current test is carried out, the selector switch S1 is switched on the step-down transformer, the control switch S2 is switched off, the switch S3 is switched on, the analog pantograph lifting device is controlled to enable the contact wire to be in contact with the pantograph, the phase controller receives a current signal detected by the first current probe and carries out phase judgment, the antenna is placed at a specific distance position near the contact wire and the pantograph, the multi-channel oscilloscope receives a voltage signal detected by the second voltage probe, a current signal detected by the second current probe and an electromagnetic field signal detected by the antenna, and the spectrometer receives an electromagnetic field signal detected by the antenna; the phase controller sends a driving signal to the analog pantograph lifting device at a set phase of a current signal, the pantograph moves downwards to be separated from the contact line and simultaneously sends a sampling trigger signal to the oscilloscope, the testing device detects voltage, current and electromagnetic field signals while the contact line and the pantograph are separated from arcing, and the frequency spectrograph adopts a maximum hold setting to collect a maximum frequency domain signal in an arc process.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the phase controller collects voltage signals between a contact wire and a pantograph and current signals flowing between pantograph nets, which are measured by the voltage probe, judges the phase of the signals, sends out driving signals at a set phase to control the vertical movement of the pantograph, and realizes the contact and separation of the contact wire and the pantograph at the set phase. And simultaneously, a trigger signal is sent to the multi-channel oscilloscope, the oscilloscope simultaneously collects a voltage signal between a contact wire and a pantograph, a current signal flowing between a pantograph net and an arc radiation electromagnetic wave signal received by the antenna, which are measured by the voltage probe, and the frequency spectrograph collects the electromagnetic radiation signal and an oscilloscope sampling signal to perform comparative analysis, so that the phase is controllable, and the comprehensive research on the offline electromagnetic disturbance characteristic of the pantograph net is facilitated. Because the voltage and current and the electromagnetic radiation signals are synchronously sampled, a clear corresponding relation can be obtained, and the collected electromagnetic disturbance signals are proved to be generated by the bow net off-line electric arc, so that the environmental electromagnetic interference is eliminated.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a waveform diagram of a sine wave;
FIG. 2 is a functional block diagram of a system according to an embodiment of the present invention;
FIG. 3 is a test chart in an embodiment of the present invention;
wherein: 1. an alternating current power supply; 2. a voltage regulator; 3. a step-up transformer; 4. a step-down transformer; 5. a contact line; 6. a pantograph; 7. a first voltage probe; 8. a second voltage probe; 9. a first current probe; 10. a second current probe; 11. channel 1 curve; 12. channel 2 curve; 13. channel 3 curve; 14. the channel 4 is curved.
Detailed Description
The technical solutions in the embodiments of the present invention are 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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 2, the embodiment of the invention discloses a phase-controllable bow net offline electromagnetic disturbance simulation system, which comprises a simulation device and a test device, wherein the simulation device comprises an alternating current power supply 1, a phase controller and a simulation lifting device, and the test device comprises an antenna, an oscilloscope and a frequency spectrograph;
the alternating current power supply 1 can generate high-voltage small current and low-voltage large current which are respectively used for simulating breakdown discharge of high voltage and arc discharge of large current; the alternating current power supply 1 is connected with the primary side of the voltage regulator 2, the secondary side of the voltage regulator 2 is divided into two paths after passing through a selection switch S1, the first path is connected with the primary side of the boosting transformer 3 and used for supplying power to the boosting transformer 3, and the second path is connected with the primary side of the step-down transformer 4 and used for supplying power to the step-down transformer; the high-voltage end of the secondary side winding of the step-up transformer 3 is connected with a contact wire 5 of the analog lifting bow device after sequentially passing through a protective resistor R1 and a switch S2, and the low-voltage end of the secondary side winding of the step-up transformer 3 is connected with a pantograph 6 of the analog lifting bow device; the high-voltage end of the secondary side winding of the step-down transformer 4 is connected with the contact wire 5 of the analog pantograph lifting device after passing through a switch S3, and the low-voltage end of the secondary side winding of the step-down transformer 4 is connected with the pantograph 6 of the analog pantograph lifting device; the pantograph 6 of the simulation pantograph lifting device can move up and down under the control of the stepping motor, and the contact and separation with the contact line 5 are realized.
The voltage probe comprises a first voltage probe 7 and a second voltage probe 8, one end of the first voltage probe 7 and one end of the second voltage probe 8 are connected with a junction point of a switch S2 and a contact line 5, the other end of the first voltage probe 7 and the other end of the second voltage probe 8 are connected with a low-voltage end of a secondary side winding of a step-up transformer 3, a signal output end of the first voltage probe 7 is connected with a voltage signal input end of the phase controller, and a signal output end of the second voltage probe 8 is connected with a voltage signal input end of the oscilloscope.
The current probes comprise a first current probe 9 and a second current probe 10, the first current probe 9 and the second current probe 10 are located on the wire between the switch S2 and the contact wire 5 for collecting current signals flowing between the pantograph and catenary.
The phase controller collects a voltage signal between the contact line 5 and the pantograph 6 measured by the voltage probe and a current signal flowing between pantograph nets, judges the phase of the signals, sends out a driving signal at a set phase, controls the vertical movement of the pantograph through the analog pantograph lifting device, and realizes the contact and separation of the contact line 5 and the pantograph 6 at the set phase; and simultaneously sending a trigger signal to a multi-channel oscilloscope, simultaneously acquiring a voltage signal between a contact wire 5 and a pantograph 6 measured by a voltage probe, a current signal flowing between the pantograph nets and an arc radiation electromagnetic wave signal received by an antenna by the oscilloscope, and acquiring an electromagnetic radiation signal and an oscilloscope sampling signal by a frequency spectrograph for comparison analysis.
Correspondingly, the embodiment of the invention also discloses a phase-controllable bow net offline electromagnetic disturbance simulation test method, wherein the test method uses the simulation system, and the method comprises the following steps:
when a high-voltage small current test is carried out, the selector switch S1 is switched on the step-up transformer 3, the control switch S2 is switched on, the switch S3 is switched off, the analog pantograph lifting device is controlled to separate the contact wire 5 from the pantograph 6, the phase controller receives a voltage signal detected by the first voltage probe 7 and carries out phase judgment, the antenna is placed at a specific distance near the contact wire 5 and the pantograph 6, the multi-channel oscilloscope receives a voltage signal detected by the second voltage probe 8, a current signal detected by the second current probe 10 and an electromagnetic field signal detected by the antenna, the spectrometer receives the electromagnetic field signal detected by the antenna, the phase controller sends a driving signal to the analog pantograph lifting device at a set phase of the voltage signal to enable the pantograph 6 to move upwards to be in contact with the contact wire 5 and simultaneously sends a sampling trigger signal to the oscilloscope, the test device detects the voltage current and the electromagnetic field signal when the contact wire 5 and the pantograph 6 are in contact breakdown to generate an arc, the frequency spectrograph adopts maximum hold setting to collect maximum frequency domain signals in the electric arc process;
when a low-voltage large-current test is carried out, the selector switch S1 is switched on the step-down transformer 4, the control switch S2 is switched off, the switch S3 is switched on, the analog pantograph lifting device is controlled to enable the contact wire 5 to be in contact with the pantograph 6, the phase controller receives a current signal detected by the first current probe 9 and carries out phase judgment, the antenna is placed at a specific distance near the contact wire 5 and the pantograph 6, the multi-channel oscilloscope receives a voltage signal detected by the second voltage probe 8, a current signal detected by the second current probe 10 and an electromagnetic field signal detected by the antenna, and the spectrometer receives an electromagnetic field signal detected by the antenna; the phase controller sends a driving signal to the analog pantograph lifting device at a set phase of a current signal, the pantograph 6 moves downwards to be separated from the contact wire 5 and sends a sampling trigger signal to the oscilloscope at the same time, the testing device detects voltage current and electromagnetic field signals while the contact wire 5 and the pantograph 6 are separated from arc discharge, and the frequency spectrograph adopts a maximum hold setting to collect a maximum frequency domain signal in an arc process.
Because the voltage current and the electromagnetic radiation signal are synchronously sampled, a clear corresponding relation can be obtained, the collected electromagnetic disturbance signal is proved to be generated by the bow net off-line electric arc, and the environmental electromagnetic interference is eliminated, as shown in fig. 3, wherein a channel 1 curve and a channel 3 curve are current signals measured by adopting two current sensors, a channel 2 curve is a voltage signal between bow nets, and a channel 4 curve is a radiation signal measured by an antenna.
Claims (4)
1. The utility model provides a controllable bow net off-line electromagnetism harassment analog system of phase place which characterized in that: the device comprises an analog device and a test device, wherein the analog device comprises an alternating current power supply (1), a phase controller and an analog lifting device, and the test device comprises an antenna, an oscilloscope and a frequency spectrograph;
the alternating current power supply (1) can generate high-voltage low current and low-voltage high current and is respectively used for simulating high-voltage breakdown discharge and high-current arc discharge; the alternating current power supply (1) is connected with the primary side of the voltage regulator (2), the secondary side of the voltage regulator (2) is divided into two paths after passing through a selection switch S1, the first path is connected with the primary side of the boosting transformer (3) and used for supplying power to the boosting transformer (3), and the second path is connected with the primary side of the step-down transformer (4) and used for supplying power to the step-down transformer; the high-voltage end of the secondary side winding of the boosting transformer (3) is connected with a contact wire (5) of the analog pantograph lifting device after sequentially passing through a protective resistor R1 and a switch S2, and the low-voltage end of the secondary side winding of the boosting transformer (3) is connected with a pantograph (6) of the analog pantograph lifting device; the high-voltage end of the secondary side winding of the step-down transformer (4) is connected with a contact wire (5) of the analog lifting bow device after passing through a switch S3, and the low-voltage end of the secondary side winding of the step-down transformer (4) is connected with a pantograph (6) of the analog lifting bow device; the pantograph (6) of the simulation pantograph lifting device is controlled by a stepping motor to move up and down, so that the contact and the separation with the contact line (5) are realized;
the phase controller collects a voltage signal between the contact line (5) and the pantograph (6) measured by the voltage probe and a current signal flowing between pantograph nets, judges the phase of the signal, sends a driving signal at a set phase, controls the vertical movement of the pantograph through the analog pantograph lifting device, and realizes the contact and separation of the contact line (5) and the pantograph (6) at the set phase; and simultaneously sending a trigger signal to a multi-channel oscilloscope, simultaneously acquiring a voltage signal between a contact wire (5) and a pantograph (6) measured by a voltage probe, a current signal flowing between the pantograph and an electric arc radiation electromagnetic wave signal received by an antenna by the oscilloscope, and acquiring the electromagnetic radiation signal and an oscilloscope sampling signal by a frequency spectrograph for comparison analysis.
2. The phase-controllable bow net offline electromagnetic disturbance simulation system of claim 1, wherein: the voltage probe comprises a first voltage probe (7) and a second voltage probe (8), one end of the first voltage probe (7) and one end of the second voltage probe (8) are connected with a junction point of a switch S2 and a contact line (5), the other end of the first voltage probe (7) and the other end of the second voltage probe (8) are connected with a low-voltage end of a secondary side winding of a step-up transformer (3), a signal output end of the first voltage probe (7) is connected with a voltage signal input end of the phase controller, and a signal output end of the second voltage probe (8) is connected with a voltage signal input end of the oscilloscope.
3. The phase-controllable bow net offline electromagnetic disturbance simulation system of claim 1, wherein: the current probe comprises a first current probe (9) and a second current probe (10), wherein the first current probe (9) and the second current probe (10) are positioned on a conducting wire between a switch S2 and a contact wire (5) and are used for collecting current signals flowing between the arches.
4. A phase-controllable bow net off-line electromagnetic disturbance simulation test method is characterized by comprising the following steps: the testing method using a simulation system according to any of claims 1-3, the method comprising the steps of:
when a high-voltage small-current test is carried out, a selector switch S1 is switched on a step-up transformer (3), a control switch S2 is switched on, a switch S3 is switched off, an analog pantograph lifting device is controlled to separate a contact wire (5) and a pantograph (6), a phase controller receives a voltage signal detected by a first voltage probe (7) and carries out phase judgment, an antenna is placed at a specific distance near the contact wire (5) and the pantograph (6), a multi-channel oscilloscope receives a voltage signal detected by a second voltage probe (8), a current signal detected by a second current probe (10) and an electromagnetic field signal detected by the antenna, a spectrometer receives an electromagnetic field signal detected by the antenna, the phase controller sends a driving signal to the analog pantograph lifting device at a set phase of the voltage signal to enable the pantograph (6) to move upwards to be in contact with the contact wire (5) and simultaneously sends a sampling trigger signal to the oscilloscope, the testing device detects voltage, current and electromagnetic field signals when the contact line (5) and the pantograph (6) are in contact breakdown to generate electric arcs, and the frequency spectrograph adopts the maximum holding setting to collect the maximum frequency domain signals in the electric arc process;
when a low-voltage large-current test is carried out, the selector switch S1 is switched on the step-down transformer (4), the control switch S2 is switched off, the switch S3 is switched on, the analog pantograph lifting device is controlled to enable the contact wire (5) to be in contact with the pantograph (6), the phase controller receives a current signal detected by the first current probe (9) and carries out phase judgment, the antenna is placed at a specific distance position near the contact wire (5) and the pantograph (6), the multi-channel oscilloscope receives a voltage signal detected by the second voltage probe (8), a current signal detected by the second current probe (10) and an electromagnetic field signal detected by the antenna, and the spectrometer receives an electromagnetic field signal detected by the antenna; the phase controller sends a driving signal to the analog pantograph lifting device at a set phase of a current signal, the pantograph (6) moves downwards to be separated from the contact line (5) and sends a sampling trigger signal to the oscilloscope at the same time, the testing device detects voltage current and electromagnetic field signals while the contact line (5) and the pantograph (6) are separated to be drawn, and the frequency spectrograph adopts a maximum holding setting to collect a maximum frequency domain signal in an arc process.
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| CN113109677A (en) * | 2021-04-14 | 2021-07-13 | 北京全路通信信号研究设计院集团有限公司 | High-speed bow net arc discharge simulation device and method thereof |
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