CN111521964A - Electromagnetic field test platform for simulating power grid incident disturbance - Google Patents
Electromagnetic field test platform for simulating power grid incident disturbance Download PDFInfo
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- G—PHYSICS
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Abstract
The invention provides an electromagnetic field test platform for simulating power grid incident disturbance, which comprises a power supply module, a comprehensive control and display module, a phase control module, a power frequency electric field generation module, a power frequency magnetic field generation module, an impact magnetic field generation module and a waveform measurement module, wherein the comprehensive control and display module is connected with the phase control module; the power supply module provides a high-power supply for the simulation generation platform; the comprehensive control and display module is used for intensively controlling the generation of a power frequency electric field, a power frequency magnetic field and an impact magnetic field and displaying parameters such as an output voltage value, a current value, a phase and the like; the phase control module controls the impact magnetic field generation module to output the impact magnetic field, the power frequency magnetic field and the power frequency electromagnetic field in any superimposed phase; the waveform measuring module realizes the synchronous measurement of power frequency high voltage, power frequency current and impact current waveform. The invention can simulate the simultaneous output of a power frequency electric field, a power frequency magnetic field and an impact magnetic field, and the impact magnetic field and the power frequency electric field can be superposed in any phase, thereby meeting the electromagnetic field environment requirement of an online monitoring device or a charged detection instrument during laboratory calibration.
Description
Technical Field
The invention relates to the technical field of detection and calibration of an electrical equipment state detection instrument device, in particular to an electromagnetic field test platform for simulating power grid event disturbance.
Background
Power frequency electric fields, power frequency magnetic fields, impact interference, radio interference, noise interference and the like exist in the running power transmission line and the running transformer substation. The existing charged detection instruments used in large quantity detect the operation parameters of electrical equipment in a charged state, and are very easy to suffer from various electromagnetic interferences to cause problems of unstable data and the like in use; and the performance of the on-line monitoring device widely installed in the transformer substation can be reduced or even lost when the on-line monitoring device runs in a complex electromagnetic environment for a long time, and the due monitoring and early warning effects cannot be exerted. Therefore, before and during the use of the charged detection instrument and the online monitoring device, the performance of the instrument needs to be comprehensively checked, the reliability and the accuracy of the instrument and the online monitoring device are checked and evaluated under the electromagnetic interference environment, the performance of the charged detection instrument and the performance of the online monitoring device can be discriminated, the unreliable and inaccurate detection instrument and the monitoring device are prevented from being used, and the method is one of important inspection items in the power industry.
The power frequency electric field and the power frequency magnetic field are main interference sources stably existing in a power transmission and transformation site, and measurement acquisition and laboratory simulation are facilitated. CN201810516630.2 discloses a power frequency electromagnetic field generating platform for simulating a transformer substation site, and the environment of a power frequency electric field and a power frequency magnetic field equivalent to the transformer substation site is simulated and generated in a laboratory.
The inventor of the present application has found through research in the process of implementing the present invention that: lightning overvoltage and operation overvoltage often occur on the site of a power transmission line and a transformer substation, so that the lightning arrester can act and impact current is released, and a transient electromagnetic process is caused on electrical equipment; in addition, in the normal switching-on and switching-off process of the switch and the knife switch, the change of transient current is also accompanied, and further pulse electromagnetic disturbance is generated. In the sudden and temporary power grid event process, instantaneous and pulsed large current is generated around the power transmission line and in the transformer substation, and an impact pulse magnetic field generated along with the instantaneous and pulsed large current is superposed in the environment of a stable power frequency electric field and a stable power frequency magnetic field to cause transient impact on the online monitoring devices installed in the power transmission line and the transformer substation, so that a great interference signal can influence the measurement performance of the online monitoring devices and the charged detection instrument, and even damage the sensor or the sampling unit. Therefore, the simulation of the impact magnetic field generated by the power grid incident disturbance has important practical significance for objectively and comprehensively examining the online monitoring device and the electrified detection instrument. Because the impact pulse magnetic field has burst property and randomness, when the impact pulse magnetic field is simulated in a laboratory, the impact pulse magnetic field can be superposed on a power frequency electromagnetic field with any phase difference. At present, no research report on the aspect is found at home and abroad.
Disclosure of Invention
The invention provides an electromagnetic field test platform for simulating power grid incident disturbance, which can realize simultaneous output of a power frequency electric field, a power frequency magnetic field and an impact magnetic field, wherein the electric field strength and the magnetic field strength are continuously adjustable, the power frequency electric field strength is 100kV/m at most, the power frequency magnetic field strength is 1mT at most, and the impact magnetic field and the power frequency electromagnetic field can be superposed in any phase, so that the test requirements of simulating a field power frequency electromagnetic field and an impact pulse magnetic field are completely met.
In order to solve the technical problems, the invention adopts the following technical scheme:
an electromagnetic field test platform for simulating power grid incident disturbance comprises a power supply module, a comprehensive control and display module, a phase control module, a power frequency electric field generation module, a power frequency magnetic field generation module, an impact magnetic field generation module and a waveform measurement module;
the output end of the power supply module is connected with the power supply input ends of the comprehensive control and display module and the phase control module and is used for providing power supply for the whole power grid incident disturbance electromagnetic characteristic parameter simulation generation platform;
the comprehensive control and display module is respectively connected with the power frequency electric field generation module, the power frequency magnetic field generation module and the impact magnetic field generation module, and is used for intensively controlling the generation and the turn-off of the power frequency electric field, the power frequency magnetic field and the impact magnetic field and simultaneously displaying the voltage value, the current value and the phase position output by the simulation generation platform; the comprehensive control and display module is also connected with the phase control module and is used for sending the superposed phase difference of the impact magnetic field and the power frequency electromagnetic field which are arranged on the comprehensive control and display module to the phase control module;
the output end of the phase control module is connected with the switching signal input end of the impact magnetic field generation module and is used for controlling the switching signal input end to realize the superposition output of the impact magnetic field and the power frequency electromagnetic field with any phase difference;
the power frequency electric field generating module is used for generating a power frequency electric field, and the output power frequency high voltage of the power frequency electric field is connected to the input end of a first measuring channel of the waveform measuring module; the power frequency magnetic field generating module is used for generating a power frequency magnetic field, and the output power frequency current of the power frequency magnetic field generating module is connected to the input end of a second measuring channel of the waveform measuring module; the impact magnetic field generating module is used for generating a high-frequency impact magnetic field, and the output impact current of the impact magnetic field generating module is connected to the input end of a third measuring channel of the waveform measuring module;
the waveform measuring module is used for synchronously measuring power frequency high voltage, power frequency current and impact current waveforms and verifying whether the impact magnetic field and the power frequency electromagnetic field are superposed and output according to a preset phase difference.
Furthermore, the phase control module comprises a voltage signal sampling and conditioning module, a phase-locking frequency multiplication module and a microcontroller delay module which are sequentially cascaded;
the voltage signal sampling and conditioning module is used for sampling and conditioning the power frequency electromagnetic field excitation source voltage, inputting the signal into the phase-locked frequency doubling module for phase tracking locking and frequency doubling processing, and then inputting the signal into the microcontroller delay module, the microcontroller delay module adjusts the phase of the impact magnetic field by controlling the delay pulse number of the impact current relative to the power frequency electromagnetic field excitation source voltage signal, and when the phase of the impact magnetic field is adjusted to reach the preset phase of the comprehensive control and display module, the microcontroller delay module outputs a switching signal to control the conduction of a discharge output module in the impact magnetic field generation module and the output of the impact current, so that the impact magnetic field superposed with the power frequency electromagnetic field by the preset phase difference is generated.
Furthermore, the impact magnetic field generation module comprises a boosting and rectifying charging module, a discharging output module and an impact current coil device which are connected in sequence; the boost and rectification charging module is used for boosting and rectifying the voltage of the excitation source of the impact magnetic field and charging a high-voltage energy storage capacitor, the voltages at two ends of the high-voltage energy storage capacitor are connected to the voltage input end of the discharge output module, the switching signal input end of the discharge output module is connected with the output end of the phase control module, the discharge output module is controlled to be switched on and off by the switching signal output by the phase control module, and the output end of the discharge output module is connected in series with the impact current coil device to form a complete impact current loop.
Further, the discharging output module comprises a triode Q1, a current-limiting resistor R1 and a thyristor T1, a switching signal output by the phase control module is connected to a base b of the triode Q1 as an input signal Vi for controlling the discharging output module, a voltage output by the boosting and rectifying charging module is connected to a collector of the triode Q1 as a power supply + Vcc series current-limiting resistor R1, and an emitter of the triode Q1 is connected to the ground potential; the control electrode G of the thyristor T1 is connected to the positive power supply + Vcc; the anode A end and the cathode K end of the thyristor T1 are connected in series in the output loop of the striking magnetic field discharge.
Further, when the input signal Vi is at a low level, the triode Q1 is not turned on, the control electrode G of the thyristor T1 does not generate a trigger current, the thyristor T1 is not turned on, and no impulse current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and a rush current is generated.
Furthermore, the impact current coil device is fixed on the inner side of the power frequency magnetic field coil and is vertically and equidistantly placed on the left side and the right side of the power frequency electric field generation module to form an impact magnetic field of an effective area.
Furthermore, the impulse current coil device comprises an incoming line copper bar, an impulse current coil and an outgoing line copper bar; the impact current flows into the impact current coil through the incoming copper bar connected with the positive impact wave output end, and after flowing through the left impact current coil and the right impact current coil, the impact current flows out through the outgoing copper bar and returns to the negative impact wave output end, so that a complete impact current loop is formed.
Furthermore, the incoming line copper bar and the outgoing line copper bar are both made of red copper bars with the width of 40mm and the thickness of 5mm, and are bent by 90 degrees so as to be convenient for wiring.
Furthermore, the impulse current coil is a copper bar current-carrying loop, one turn of coil is formed by every 4 copper bars, the number of turns of the coil is 3 turns, the distance between the coils is 100-150 mm, the side length of the coil is 1200-1700 mm, the coil is made of red copper bars with the width of 40mm and the thickness of 5mm, and the current-carrying requirement of 10kA impulse current is met.
Furthermore, the impact current coil device also comprises a first nylon clamp and a second nylon clamp, wherein the first nylon clamp is used for simultaneously fixing and clamping the impact current coil and the power frequency magnetic field coil, and is further clamped by matching with the second nylon clamp; the first nylon clamping piece and the second nylon clamping piece are both made of nylon with the thickness of 30mm and the width of 100 mm.
The invention has the following advantages and positive effects:
1) the invention provides an electromagnetic field test platform for simulating power grid event disturbance, which can provide a complex electromagnetic field interference environment close to the real working condition of a power transmission and transformation site for the detection of an online monitoring device and a charged detection instrument in a laboratory, and can meet the simultaneous output of a power frequency electric field, a power frequency magnetic field and an impact magnetic field;
2) the power frequency electric field, the power frequency magnetic field and the impact magnetic field designed by the invention have wider ranges, and completely meet the calibration requirements of a laboratory online monitoring device and a charged detection instrument; the power frequency electric field generation module can output a power frequency high voltage of (0-100) kV, and continuous output of a power frequency electric field within the electric field intensity range of (0-100) kV/m is realized; the power frequency magnetic field generation module can output power frequency current of (0-1) kA, and continuous output of a power frequency magnetic field within a (0-1) mT magnetic field intensity range is realized; the impact magnetic field generation module can output (0-10) kA and 8/20uS high-frequency impact current, and impact magnetic field output of (0-1) mT high-frequency impact magnetic field intensity is realized;
3) the invention can realize the superposition of the impact magnetic field and the power frequency electromagnetic field in any phase, thereby ensuring the authenticity of the phase of the electromagnetic field of the transformer substation in the simulation field operation under the laboratory environment;
4) the invention considers the compatibility of the power frequency electric field test, the power frequency magnetic field test and the impact magnetic field test, and all the generating modules are integrated on the structure and the comprehensive control, thereby not only ensuring the superposition of the simultaneous output of the power frequency electric field, the power frequency magnetic field and the impact magnetic field, but also ensuring the independence of the independent output of all the generating modules.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic field test platform for simulating grid event disturbance according to an embodiment of the present invention;
FIG. 2 is a schematic block circuit diagram of a phase control module in an embodiment of the invention;
FIG. 3 is a schematic block diagram of the circuitry of the magnetic shock field generating module in an embodiment of the present invention;
FIG. 4 is a circuit diagram of a discharge output module in the striking magnetic field generating module according to the present invention;
fig. 5 is a schematic structural diagram of a rush current coil device in an embodiment of the invention.
The reference numerals in the figures are as follows:
1-a power supply module, 2-a comprehensive control and display module and 3-a phase control module; 4-power frequency electric field generation module, 5-power frequency magnetic field generation module, 6-impact magnetic field generation module and 7-waveform measurement module; 3.1-a voltage signal sampling and conditioning module, 3.2-a phase-locked frequency multiplication module and 3.3-a microcontroller delay module; vi-discharge output module input signal; + Vcc-thyristor switched circuit power supply; q1-triode, R1-current limiting resistor, T1-thyristor; 6.1-a boosting and rectifying charging module, 6.2-a discharging output module and 6.3-an impact current coil device; 5.1-power frequency magnetic field coil, 6.3.1-incoming line copper plate, 6.3.2-impact current coil, 6.3.3-outgoing line copper plate, 6.3.4-first nylon clamp and 6.3.5-second nylon clamp.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of an electromagnetic field test platform for simulating power grid incident disturbance according to the present invention, and the electromagnetic field test platform for simulating power grid incident disturbance includes a power module 1, a comprehensive control and display module 2, a phase control module 3, a power frequency electric field generation module 4, a power frequency magnetic field generation module 5, an impact magnetic field generation module 6, and a waveform measurement module 7.
The output end of the power supply module 1 is connected with the power supply input ends of the comprehensive control and display module 2 and the phase control module 3, and a high-power supply is provided for the whole power grid incident disturbance electromagnetic characteristic parameter simulation generation platform.
The comprehensive control and display module 2 is respectively connected with the power frequency electric field generation module 4, the power frequency magnetic field generation module 5 and the impact magnetic field generation module 6, and is used for intensively controlling the generation and the turn-off of the power frequency electric field, the power frequency magnetic field and the impact magnetic field and simultaneously displaying the voltage value, the current value and the phase output by the simulation generation platform; the comprehensive control and display module 2 is also connected with the phase control module 3 and is used for sending the superposed phase value of the impact magnetic field and the power frequency electromagnetic field set by the comprehensive control and display module 2 to the phase control module 3.
The output end of the phase control module 3 is connected with the switching signal input end of the impact magnetic field generation module 6, and is used for controlling the impact magnetic field generation module 6 to output the impact magnetic field and the power frequency electromagnetic field in any superimposed phase according to the superimposed phase value of the impact magnetic field and the power frequency electromagnetic field set by the comprehensive control and display module 2.
The power frequency electric field generating module 4 is used for generating a power frequency electric field, and the output power frequency high voltage of the power frequency electric field is connected to the input end of the first measuring channel of the waveform measuring module 7; the power frequency magnetic field generating module 5 is used for generating a power frequency magnetic field, and the output power frequency current of the power frequency magnetic field is connected to the input end of a second measuring channel of the waveform measuring module 7; the impact magnetic field generating module 6 is used for generating a high-frequency impact magnetic field, and the output impact current of the impact magnetic field generating module is connected to the input end of a third measuring channel of the waveform measuring module 7;
the waveform measuring module 7 is used for synchronously measuring power frequency high voltage, power frequency current and impact current waveforms and verifying the function of outputting the superimposed phases of the impact magnetic field and the power frequency electromagnetic field.
The specific implementation method of the invention is as follows:
the tested on-line monitoring device or the electrified detection instrument is placed on an electromagnetic field test platform for simulating power grid incident disturbance, a tester sets and controls parameters such as voltage, current and phase at an operation table of the comprehensive control and display module 2, the power frequency high voltage generation, the power frequency heavy current generation and the impact magnetic field boosting rectification and charging action are controlled to occur, the power frequency electric field generation module 4 generates a power frequency electric field, and the power frequency magnetic field generation module 5 generates a power frequency magnetic field; when the voltages at two ends of the high-voltage energy storage capacitor of the impact magnetic field generation module 6 rise to a set voltage, the high-voltage energy storage capacitor is not discharged temporarily, and when the phase control module 3 is waited to adjust the superposed phase between the impact magnetic field and the power frequency electromagnetic field to reach a preset phase, the phase control module 3 controls the impact magnetic field discharge loop of the impact magnetic field generation module 6 to start discharging to generate an impact magnetic field which is superposed on the power frequency electric field and the power frequency magnetic field to jointly generate a complex electromagnetic environment in a test area; meanwhile, the high-voltage waveform of the power frequency electric field, the large-current waveform of the power frequency magnetic field and the high-frequency impact current waveform of the impact magnetic field are input to a waveform measuring module for synchronous measurement so as to check whether the superposed phase of the impact magnetic field and the power frequency electromagnetic field is output according to a preset value.
The structure of each functional block in the invention is specifically introduced as follows:
1. power supply module 1
The power supply module 1 is 220V power frequency commercial power and is used for providing a high-power supply for the whole power grid incident disturbance electromagnetic characteristic parameter simulation generation platform. Considering that the output powers of the power frequency electric field generation module 4, the power frequency magnetic field generation module 5 and the impact magnetic field generation module 6 are different, the sectional areas of power lines of the modules are different, and the method specifically comprises the following steps: the power frequency electric field generation module 4 adopts a structure with a sectional area of 6mm2A power line obtains a low-power supply from a 220V power frequency commercial power socket; the power frequency magnetic field generation module 5 and the impact magnetic field generation module 6 both adopt 35mm sectional areas2The high-power input power line of the special current booster obtains a high-power supply from a 220V power frequency commercial power socket.
2. Integrated control and display module 2
The comprehensive control and display module 2 is a comprehensive control and display operation console integrating a power frequency high-voltage generation control system, a power frequency heavy-current generation control system and an impact magnetic field impact current generation control system, is used for intensively controlling the generation and the shutoff of a power frequency electric field, a power frequency magnetic field and an impact magnetic field, and simultaneously displays parameters such as an electric field high-voltage value, a power frequency magnetic field large current value and an impact magnetic field large current value output by a simulation generation platform; meanwhile, the integrated control and display module 2 is provided with an output current overcurrent protection device, so that once overcurrent output is performed, the output voltage is automatically cut off, accidental discharge is prevented, and the test safety is ensured. The operation panel of the comprehensive control and display module 2 can manually preset the expected impact magnetic field phase value output by overlapping with the power frequency electromagnetic field according to the test requirement, and the impact magnetic field with the preset phase is output by overlapping on the power frequency electromagnetic field by matching with the phase control module 3.
3. Phase control module 3
As shown in fig. 2, the phase control module 3 includes a voltage signal sampling and conditioning module 3.1, a phase-locked frequency doubling module 3.2, and a microcontroller delay module 3.3, which are sequentially cascaded.
The voltage signal sampling and conditioning module 3.1 is used for sampling and conditioning the signal of the power frequency electromagnetic field excitation source voltage, the phase-locked frequency multiplication module 3.2 is input for phase tracking locking and frequency multiplication, and then the phase-locked frequency multiplication and frequency multiplication are input into the microcontroller delay module 3.3, the microcontroller delay module 3.3 adjusts the phase of the impact magnetic field by controlling the delay pulse number of the impact current relative to the power frequency electromagnetic field excitation source voltage signal, when the phase of the impact magnetic field is adjusted to reach the preset phase of the comprehensive control and display module 2, the microcontroller delay module 3.3 outputs high level as the switching signal of the phase control module 3 to be input to the switching signal output end of the impact magnetic field generation module 6, and further controlling a discharge output module 6.2 (shown in fig. 3) in the impact magnetic field generation module 6 to be conducted, and outputting impact current, so as to generate an impact magnetic field which is superposed with the power frequency electromagnetic field in a preset phase. For example, the phase-locked frequency doubling module 3.2 doubles the frequency of 50Hz by 1000 times to 50kHz, the number of pulses in 20ms is 1000, 1 pulse corresponds to 20 μ s of time and 0.36 ° of phase, and the corresponding number of pulses can be converted from the set superposition phase.
4. Power frequency electromagnetic field generating module
The power frequency electric field generation module 4 comprises a control console, a current booster or a power frequency heavy current generator and a power frequency magnetic field coil, wherein the control console controls the current booster or the power frequency heavy current generator to output current, and the current passes through the power frequency magnetic field coil to generate a magnetic field in a test area around the coil.
The power frequency electric field generation module 4 and the power frequency magnetic field generation module 5 realize continuous output of a power frequency electric field and a power frequency magnetic field in a program-controlled voltage regulation mode, wherein the power frequency high voltage continuous output range is (0-100) kV, so that the power frequency electric field continuous output in the electric field intensity range of (0-100) kV/m is realized; the continuous output range of the power frequency current is (0-1) kA, so that the continuous output of the power frequency magnetic field within the magnetic field intensity range of (0-1) mT is realized.
5. Impulse magnetic field generation module 6
As shown in fig. 3, the magnetic impulse field generating module 6 includes a boost and rectification charging module 6.1, a discharge output module 6.2, and an impulse current coil device 6.3, which are connected in sequence; the boost and rectification charging module 6.1 is used for boosting and rectifying the voltage of the excitation source of the impact magnetic field and charging the high-voltage energy storage capacitor, the voltages at two ends of the high-voltage energy storage capacitor are connected to the voltage input end of the discharge output module 6.2, the switch signal input end of the discharge output module 6.2 is connected with the output end of the microcontroller delay module 3.3 of the phase control module 3, the discharge output module 6.2 is controlled to be switched on and off by the switch signal output by the microcontroller delay module 3.3, and the output end of the discharge output module 6.2 is connected in series with the impact current coil device 6.3 to form a complete impact current loop.
As shown in fig. 4, the discharging output module 6.2 includes a transistor Q1, a current-limiting resistor R1, and a thyristor T1, the switching signal output by the microcontroller delay module 3.3 is connected to the base b of the transistor Q1 as the input signal Vi, the voltage output by the boosting and rectifying charging module 6.1 is connected to the collector of the transistor Q1 as the power supply + Vcc series current-limiting resistor R1, and the emitter of the transistor Q1 is connected to the ground potential; the control electrode G of the thyristor T1 is connected to the positive power supply + Vcc; the anode A end and the cathode K end of the thyristor T1 are connected in series in the output loop of the striking magnetic field discharge. When the input signal Vi is at a low level, the triode Q1 is not conducted, the control electrode G of the thyristor T1 does not generate trigger current, the thyristor T1 is not conducted, and no impact current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and a rush current is generated.
In specific implementation, the phase control module 3 counts the frequency doubling pulses from the zero crossing point, and when the frequency doubling pulses reach a set count value, sends control pulses, namely switching signals, to control the conduction of the thyristor T1, discharges, and outputs impact current to the coil, so that an impact magnetic field is generated in a test area.
The model of the triode Q1 is a 9013 NPN triode; the resistance value of the current limiting resistor R1 is 10 k; power supply + Vcc + 5V; considering that the surge wave voltage of the surge magnetic field discharge loop is as high as 20kV, 4 thyristors of 5kV/10kA are selected to be connected in series for dividing voltage, the total number of the 4 thyristors connected in series is equivalent to T1 in fig. 3, the control poles of the 4 thyristors connected in series are connected together and are equivalent to the control pole G of T1 in fig. 3, and a thyristor switch circuit is used for controlling whether the control pole G of the thyristor generates trigger current or not, so that whether the thyristor T1 is conducted or not is controlled, and the switch control function of the surge magnetic field current loop is realized.
The impact current coil device 6.3 is fixed on the inner side of the power frequency magnetic field coil 5.1 in the power frequency magnetic field generation module 5 and is vertically and equidistantly placed on the left side and the right side of the power frequency electric field generation module 4 to form an impact magnetic field in an effective area.
As shown in fig. 5, the inrush current coil device 6.3 comprises: the device comprises an incoming copper bar 6.3.1, an impulse current coil 6.3.2, an outgoing copper bar 6.3.3, a first nylon clamp 6.3.4 and a second nylon clamp 6.3.5; the positive shock wave output end of the shock current output by the discharge output module 6.2 flows into the shock current coil 6.3.2 through the incoming line copper bar 6.3.1, and the shock current flows out through the outgoing line copper bar 6.3.3 after flowing through the left and right shock current coils 6.3.2 and returns to the negative shock wave output end to form a complete shock current loop.
The incoming copper bar 6.3.1 and the outgoing copper bar 6.3.3 are both made of red copper bars with the width of 40mm and the thickness of 5mm, and are bent at 90 degrees to facilitate wiring;
the impulse current coil 6.3.2 is a copper bar current-carrying loop, each 4 copper bars form a turn of coil, the number of turns of the coil is 3, the distance between the coils is 100-150 mm, the side length of the coil is 1200-1700 mm, the coil is made of red copper bars with the width of 40mm and the thickness of 5mm, and the requirement of 10kA impulse current carrying is met;
the first nylon clamp 6.3.4 fixes and clamps the impact current coil 6.3.2 and the power frequency field coil 5.1 simultaneously, and the power frequency field coil 5.1 is further clamped by matching with the second nylon clamp 6.3.5 in consideration of the thicker copper pipeline diameter of the power frequency field coil 5.1; the first nylon clamp 6.3.4 and the second nylon clamp 6.3.5 are symmetrically arranged at the centers of four sides of the power frequency magnetic field coil 5.1 and the impulse current coil 6.3.2, so that the stability of the whole coil of the simulation generation platform is ensured to be good; the first nylon clip piece 6.3.4 and the second nylon clip piece 6.3.4 are both made of nylon with the thickness of 30mm and the width of 100 mm.
The specific implementation process of the impact magnetic field generation module 6 is as follows: according to GBT 17626.8-2006 electromagnetic compatibility test and measurement technology, parameters such as capacitance, inductance and impedance of a discharge loop are designed by an impulse current generating circuit provided in a pulsed magnetic field immunity test; after the voltage is boosted, changed and rectified, the high-voltage energy storage capacitor is charged, when the voltages at the two ends of the high-voltage energy storage capacitor reach a set value and simultaneously when the phase control module 3 adjusts the phase of the impact magnetic field to reach a preset phase, a discharge loop thyristor is conducted, discharge of the discharge loop is controlled, 8/20 mu s impact current output is achieved, the output impact current is injected into the impact current coil device 6.3, and the impact magnetic field required by the test is generated.
6. Waveform measuring module 7
As shown in fig. 1, the waveform measuring module 7 has 3 input channels, and respectively inputs a power frequency electric field high-voltage waveform, a power frequency magnetic field large-current waveform and an impact magnetic field high-frequency impact current waveform; the waveform measuring module 7 is implemented in the following steps: the method comprises the steps of firstly collecting original signals of power frequency electric field high voltage, power frequency magnetic field heavy current and impact magnetic field high-frequency impact current, enabling the high voltage to be subjected to signal sampling through a resistance voltage divider, enabling the heavy current to be subjected to signal sampling through a current divider, then conditioning the sampling signals into signals capable of being received by an oscilloscope, and finally sending the signals to three input ends of the oscilloscope to perform waveform synchronous measurement.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electromagnetic field test platform for simulating power grid incident disturbance is characterized in that: the device comprises a power supply module (1), a comprehensive control and display module (2), a phase control module (3), a power frequency electric field generation module (4), a power frequency magnetic field generation module (5), an impact magnetic field generation module (6) and a waveform measurement module (7);
the output end of the power supply module (1) is connected with the power supply input ends of the comprehensive control and display module (2) and the phase control module (3) and is used for providing power supply for the whole power grid incident disturbance electromagnetic characteristic parameter simulation generation platform;
the comprehensive control and display module (2) is respectively connected with the power frequency electric field generation module (4), the power frequency magnetic field generation module (5) and the impact magnetic field generation module (6) and is used for intensively controlling the generation and the turn-off of the power frequency electric field, the power frequency magnetic field and the impact magnetic field and simultaneously displaying the voltage value, the current value and the phase position output by the electromagnetic field test platform; the comprehensive control and display module (2) is also connected with the phase control module (3) and is used for sending the superposed phase value of the impact magnetic field and the power frequency electromagnetic field set by the comprehensive control and display module (2) to the phase control module (3);
the output end of the phase control module (3) is connected with the switching signal input end of the impact magnetic field generation module (6) and is used for controlling the switching signal input end to realize the superposition output of any phase difference between the impact magnetic field and the power frequency electromagnetic field;
the power frequency electric field generating module (4) is used for generating a power frequency electric field, and the output power frequency high voltage of the power frequency electric field is connected to the input end of a first measuring channel of the waveform measuring module (7); the power frequency magnetic field generating module (5) is used for generating a power frequency magnetic field, and the output power frequency current of the power frequency magnetic field is connected to the input end of a second measuring channel of the waveform measuring module (7); the impact magnetic field generating module (6) is used for generating a high-frequency impact magnetic field, and the output impact current of the impact magnetic field generating module is connected to the input end of a third measuring channel of the waveform measuring module (7);
the waveform measuring module (7) is used for synchronously measuring power frequency high voltage, power frequency current and impact current waveforms and verifying whether the impact magnetic field is output by overlapping with the power frequency electromagnetic field according to a preset phase difference.
2. The electromagnetic field test platform for simulating grid event disturbances of claim 1, wherein: the phase control module (3) comprises a voltage signal sampling and conditioning module (3.1), a phase-locking frequency multiplication module (3.2) and a microcontroller delay module (3.3) which are sequentially cascaded;
the voltage signal sampling and conditioning module (3.1) is used for sampling and conditioning the power frequency electromagnetic field excitation source voltage, inputting the signal into the phase-locked frequency doubling module (3.2) for phase tracking locking and frequency doubling processing, and then inputting the signal into the microcontroller delay module (3.3), the microcontroller delay module (3.3) adjusts the phase of the impact magnetic field by controlling the delay pulse number of the impact current relative to the power frequency electromagnetic field excitation source voltage signal, when the phase of the impact magnetic field is adjusted to reach the preset phase of the comprehensive control and display module (2), the microcontroller delay module (3.3) outputs a switch signal, and controls the discharge output module (6.2) in the impact magnetic field generation module (6) to be switched on and output the impact current, so that the impact magnetic field superposed with the power frequency electromagnetic field in the preset phase is generated.
3. An electromagnetic field test platform for simulating grid incident disturbances according to claim 1 or 2, wherein: the impact magnetic field generation module (6) comprises a boosting and rectifying charging module (6.1), a discharging output module (6.2) and an impact current coil device (6.3) which are connected in sequence; the boost and rectification charging module (6.1) is used for boosting the voltage of the excitation source of the impact magnetic field, rectifying and charging the high-voltage energy storage capacitor, the voltages at the two ends of the high-voltage energy storage capacitor are connected to the voltage input end of the discharge output module (6.2), the switching signal input end of the discharge output module (6.2) is connected with the output end of the phase control module (3), the discharge output module (6.2) is controlled to be switched on and off by the switching signal output by the phase control module (3), and the output end of the discharge output module (6.2) is connected in series with the impact current coil device (6.3) to form a complete impact current loop.
4. An electromagnetic field test platform for simulating grid incident disturbances according to claim 3, wherein: the discharging output module (6.2) comprises a triode Q1, a current-limiting resistor R1 and a thyristor T1, a switching signal output by the phase control module (3) is used as an input signal Vi for controlling the discharging output module (3.4) and is connected to a base electrode b of the triode Q1, a voltage output by the boosting and rectifying charging module (6.1) is used as a power supply + Vcc, the current-limiting resistor R1 is connected to a collector electrode of the triode Q1 in series, and an emitter electrode of the triode Q1 is connected to the ground potential; the control electrode G of the thyristor T1 is connected to the positive power supply + Vcc; the anode A end and the cathode K end of the thyristor T1 are connected in series in the output loop of the striking magnetic field discharge.
5. The electromagnetic field test platform for simulating grid event disturbances of claim 4, wherein: when the input signal Vi is at a low level, the triode Q1 is not conducted, the control electrode G of the thyristor T1 does not generate trigger current, the thyristor T1 is not conducted, and no impact current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and a rush current is generated.
6. An electromagnetic field test platform for simulating grid incident disturbances according to claim 3, wherein: the impact current coil device (6.3) is fixed on the inner side of the power frequency magnetic field coil (5.1) and is vertically and equidistantly placed on the left side and the right side of the power frequency electric field generation module (4) to form an impact magnetic field of an effective area.
7. The electromagnetic field test platform for simulating grid event disturbances of claim 6, wherein: the impulse current coil device (6.3) comprises an incoming copper bar (6.3.1), an impulse current coil (6.3.2) and an outgoing copper bar (6.3.3); the positive shock wave output end flows into the shock current coil (6.3.2) through the incoming line copper bar (6.3.1), and after the shock current flows through the left and right shock current coils (6.3.2), the shock current flows out through the outgoing line copper bar (6.3.3) and returns to the negative shock wave output end to form a complete shock current loop.
8. The electromagnetic field test platform for simulating grid incident disturbances of claim 7, wherein: the incoming copper bar (6.3.1) and the outgoing copper bar (6.3.3) are both made of red copper bars with the width of 40mm and the thickness of 5mm, and are bent by 90 degrees to facilitate wiring.
9. The electromagnetic field test platform for simulating grid incident disturbances of claim 7, wherein: the impulse current coil (6.3.2) is a copper bar current-carrying loop, each 4 copper bars form a turn of coil, the number of turns of the coil is 3 turns, the coil interval is 100-150 mm, the side length of the coil is 1200-1700 mm, the coil is made of red copper bars with the width of 40mm and the thickness of 5mm, and the current-carrying requirement of 10kA impulse current is met.
10. The electromagnetic field test platform for simulating grid incident disturbances of claim 7, wherein: the impact current coil device (6.3) further comprises a first nylon clamping piece (6.3.4) and a second nylon clamping piece (6.3.5), wherein the first nylon clamping piece (6.3.4) is used for simultaneously fixing and clamping the impact current coil (6.3.2) and the power frequency field coil (5), and the second nylon clamping piece (6.3.4) is used for further clamping the impact current coil and the power frequency field coil; the first nylon clamp piece (6.3.4) and the second nylon clamp piece (6.3.5) are both made of nylon with the thickness of 30mm and the width of 100 mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964950A (en) * | 2021-02-05 | 2021-06-15 | 华中科技大学 | Method for testing power frequency electromagnetic interference resistance of capacitive equipment online monitoring device |
| CN114623755A (en) * | 2022-03-07 | 2022-06-14 | 中车青岛四方机车车辆股份有限公司 | Interference simulation device |
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2020
- 2020-05-07 CN CN202010376987.2A patent/CN111521964A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964950A (en) * | 2021-02-05 | 2021-06-15 | 华中科技大学 | Method for testing power frequency electromagnetic interference resistance of capacitive equipment online monitoring device |
| CN114623755A (en) * | 2022-03-07 | 2022-06-14 | 中车青岛四方机车车辆股份有限公司 | Interference simulation device |
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