CN111983397A - Insulating medium breakdown experiment device and method - Google Patents
Insulating medium breakdown experiment device and method Download PDFInfo
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- CN111983397A CN111983397A CN202010700888.5A CN202010700888A CN111983397A CN 111983397 A CN111983397 A CN 111983397A CN 202010700888 A CN202010700888 A CN 202010700888A CN 111983397 A CN111983397 A CN 111983397A
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The invention belongs to the field of high-voltage insulation, and particularly relates to an insulation dielectric breakdown experiment device and method, which comprise the following steps: the device comprises a power frequency voltage generating circuit, a harmonic voltage generating circuit, an insulating medium to be punctured and a voltage measuring circuit; the power frequency voltage generating circuit and the harmonic voltage generating circuit are respectively used for correspondingly generating power frequency voltage with adjustable amplitude and harmonic voltage with adjustable frequency and amplitude, and are superposed at two ends of the insulating medium, and the voltage measuring circuit is used for measuring the voltage at two ends of the insulating medium to obtain the breakdown voltage of the insulating medium; the breakdown current generated after the insulation medium breakdown respectively forms a loop through the power frequency voltage generating circuit and the harmonic voltage generating circuit. The insulating medium breakdown test platform has the advantages that the power frequency voltage amplitude is adjustable, the harmonic voltage frequency and the harmonic voltage amplitude are adjustable, the voltage and the frequency which are enough for dielectric breakdown can be output, and equipment can be reliably protected from being damaged after the insulating medium is broken down.
Description
Technical Field
The invention belongs to the technical field of high-voltage insulation, and particularly relates to an insulation dielectric breakdown experiment device and method.
Background
With the rapid development of modern industry, nonlinear electric equipment such as a rectifying device, a ferromagnetic element, an electric arc furnace and the like are widely applied, the harmonic content in a power grid is increased day by day, and the quality of electric energy is gradually deteriorated.
Under the action of harmonic waves, a capacitor in the power system may resonate with other devices except the nonlinear electric device, so that a large resonant current is generated, any device in the power system is damaged, and the safety of the power system is extremely unfavorable. Meanwhile, harmonic voltage and power frequency working voltage are superposed to generate a distortion voltage waveform of a sharp top, so that partial discharge is caused, and the aging of an insulating medium corresponding to the capacitor is accelerated. In addition, in the power system, the proportion of higher harmonic components tends to increase, and power frequency superposed harmonics generally exist in the actual application scene of engineering.
Therefore, the research on the breakdown characteristic of the insulating medium can effectively avoid the aging of the insulating medium and ensure the safety of a power system. However, at present, the breakdown test data under the power frequency superposition harmonic of the insulating medium is less and deficient, and a mature and reliable test platform is lacked.
Disclosure of Invention
The invention provides an insulating medium breakdown experimental device and method, which are used for solving the technical problem that the application of the existing insulating medium power frequency superposed harmonic testing platform is limited due to narrow requirements on breakdown conditions which can be met.
The technical scheme for solving the technical problems is as follows: an insulation dielectric breakdown experiment device, comprising: the device comprises a power frequency voltage generating circuit, a harmonic voltage generating circuit, an insulating medium to be punctured and a voltage measuring circuit;
the power frequency voltage generating circuit and the harmonic voltage generating circuit are respectively used for correspondingly generating power frequency voltage with adjustable amplitude and harmonic voltage with adjustable frequency and amplitude, and are superposed at two ends of the insulating medium, and the voltage measuring circuit is used for measuring the voltage at two ends of the insulating medium to obtain the breakdown voltage of the insulating medium;
after the insulation medium is broken down, the generated breakdown current passes through the power frequency voltage generating circuit and the harmonic voltage generating circuit to respectively form a loop.
The invention has the beneficial effects that: the invention provides an insulation medium breakdown test platform of power frequency superposed harmonic waves, the amplitude of power frequency voltage is adjustable, the frequency and the amplitude of harmonic voltage are both adjustable, voltage and frequency which are enough for medium breakdown can be output, the system capacity can also be met under high frequency, and after the insulation medium is broken down, the generated breakdown current respectively forms a loop through a power frequency voltage generating circuit and a harmonic voltage generating circuit, so that equipment can be reliably protected from being damaged after the insulation medium is broken down.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the power frequency voltage and the harmonic voltage are synchronously applied to two ends of the insulating medium through a capacitor bridge type loop.
The invention has the further beneficial effects that: the capacitor bridge type loop can effectively realize the isolation between the power frequency voltage generating circuit and the harmonic voltage generating circuit, and the desired power frequency voltage and the desired harmonic voltage can be added at the two ends of the insulating medium.
Further, the capacitor bridge circuit comprises a first voltage-dividing capacitor, a second voltage-dividing capacitor, a third voltage-dividing capacitor, the insulating medium and a protection resistor;
one end of the output side of the power frequency voltage generating circuit is connected between the first voltage-dividing capacitor and the third voltage-dividing capacitor, and the other end of the output side of the power frequency voltage generating circuit is connected between the second voltage-dividing capacitor and the insulating medium; one end of the output side of the harmonic voltage generation circuit is connected between the protection resistor and the third voltage division capacitor, and the other end of the output side of the harmonic voltage generation circuit is connected between the first voltage division capacitor and the second voltage division capacitor.
The invention has the further beneficial effects that: according to the superposition theorem, when a single voltage is considered, the bridge circuit can be regarded as the parallel connection of two branches, and each branch comprises two capacitors, so that the voltage borne by the single capacitor can be reduced, and the safety is higher; furthermore, the insulating medium is serially connected with a protective resistor, so that the large current generated after the insulating medium is broken down can be effectively prevented, and the whole circuit is protected.
Further, the power frequency voltage generating circuit comprises a voltage regulator, a booster and a first switch;
the voltage regulator is connected with a mains supply, and the mains supply is subjected to amplitude adjustment of the voltage regulator and then is subjected to voltage boosting of the voltage booster, and the voltage is applied to two ends of the insulating medium under the condition that the first switch is switched on.
The invention has the further beneficial effects that: the voltage regulator is arranged in the power frequency voltage generating circuit, so that the power frequency voltage applied to the insulating medium can be flexibly adjusted according to actual needs, and the breakdown requirement of the insulating medium is met. The output voltage waveform is stable, the operability is strong, the structure is simple, and the cost is low.
Further, the power frequency voltage generating circuit further comprises a first current limiting resistor which is connected in series with the first switch.
The invention has the further beneficial effects that: set up first current-limiting resistance in power frequency voltage generating circuit, can take place when the breakdown at insulating medium in the return circuit that forms between insulating medium and power frequency voltage generating circuit breakdown current be unlikely to too big and damage the component, the breakdown current capacity that consequently can bear is big, and the range of application is wide, has guaranteed experimental apparatus's life-span and experimental safety simultaneously.
Further, the harmonic voltage generating circuit comprises an alternating current variable frequency power supply, a medium frequency transformer and a second switch;
the alternating current variable frequency power supply is connected with a mains supply, and the mains supply is subjected to frequency and amplitude adjustment and then is boosted by the intermediate frequency transformer and applied to two ends of the insulating medium under the condition that the second switch is switched on.
The invention has the further beneficial effects that: the alternating-current variable-frequency power supply is arranged in the harmonic voltage generating circuit, so that the frequency and the amplitude of the harmonic voltage applied to the insulating medium can be flexibly adjusted according to actual needs, and the harmonic voltage generating circuit is particularly suitable for scenes with low harmonic frequency and meets the breakdown requirements of the insulating medium. The output voltage waveform is stable, the operability is strong, the structure is simple, and the cost is low.
Furthermore, the rated frequency range of the intermediate frequency transformer is 50-500 Hz, the rated capacity is 24kVA, the rated voltage range of the secondary side is 0-12 kV, the rated current range of the secondary side is 0-2A, and the turn ratio of the coil is 1: 30.
The invention has the further beneficial effects that: the invention provides a novel special intermediate frequency transformer which can endure wide frequency, capacity, voltage and current ranges and has high safety, meanwhile, the application conditions of the whole device are loose, the requirement on the type of an insulating medium is low, and the device can be widely applied to engineering practice.
Further, the harmonic voltage generation circuit further includes a second current limiting resistor connected in series with the second switch.
The invention has the further beneficial effects that: the second current-limiting resistor is arranged in the harmonic voltage generating circuit, so that the breakdown current in a loop formed between the insulating medium and the harmonic voltage generating circuit can not be too large to damage elements when the insulating medium breaks down, the breakdown current which can be tolerated is large in capacity, the application range is wide, and the service life and the experimental safety of the experimental device are ensured.
Further, the voltage measuring circuit comprises a resistance-capacitance voltage divider and an oscilloscope; and two ends of the resistance-capacitance voltage divider are respectively connected with two ends of the insulating medium, and the oscilloscope is connected out of the resistance-capacitance voltage divider and used for displaying the voltages at the two ends of the insulating medium.
The invention also provides an insulation dielectric breakdown experiment method, which comprises the following steps:
building the insulation dielectric breakdown experiment device;
respectively introducing commercial power to a power frequency voltage regulating generation circuit and a harmonic voltage generation circuit in the insulation dielectric breakdown experiment device, and sequentially controlling the power frequency voltage generation circuit to generate power frequency voltage with actually required voltage amplitude and the harmonic voltage generation circuit to generate harmonic voltage with actually required frequency value;
and adjusting the amplitude of the harmonic voltage corresponding to the actual required frequency value generated by the harmonic voltage generating circuit until the insulation medium breaks down.
The invention has the beneficial effects that: by adopting the insulating dielectric breakdown experiment device, the power frequency voltage is adjusted at first, and then the frequency and the amplitude of the harmonic voltage are adjusted, so that the breakdown experiment efficiency is improved, and the test result is accurate.
Drawings
Fig. 1 is a schematic block diagram of an insulation dielectric breakdown experiment apparatus according to an embodiment of the present invention;
fig. 2 is a structural diagram of an insulation dielectric breakdown testing apparatus according to an embodiment of the present invention;
fig. 3 is a structural diagram of another insulation dielectric breakdown testing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
An insulation dielectric breakdown experiment device, as shown in fig. 1, comprises: the device comprises a power frequency voltage generating circuit, a harmonic voltage generating circuit, an insulating medium to be punctured and a voltage measuring circuit.
The power frequency voltage generating circuit and the harmonic voltage generating circuit are respectively used for correspondingly generating power frequency voltage with adjustable amplitude and harmonic voltage with adjustable frequency and amplitude, and are superposed at two ends of the insulating medium, and the voltage measuring circuit is used for measuring the voltage at two ends of the insulating medium to obtain the breakdown voltage of the insulating medium; after the insulation medium is broken down, the generated breakdown current respectively forms a loop through the power frequency voltage generating circuit and the harmonic voltage generating circuit.
In the present research on the breakdown characteristics of the insulation medium, most of the research focuses on the breakdown of the insulation medium under the alternating voltage, the direct voltage or the alternating current and direct current superimposed voltage, and the research on the breakdown characteristics under the power frequency superimposed harmonic voltage is less. Although there are devices for superimposing harmonics at power frequency reported in the prior literature, the following problems exist: (1) part of the platforms are used for researching the aging characteristic of the device under the alternating current superimposed harmonic voltage, but not the breakdown characteristic, so that the voltage output by the platforms cannot meet the breakdown requirement, and a protection circuit for the insulation medium after breakdown is not provided; (2) part of platforms are only suitable for superposed voltage output under ultrahigh frequency harmonic waves, but can not meet requirements under relatively low harmonic frequency; (3) the capacity of part of the platform under the action of harmonic waves cannot meet the requirement. Therefore, the insulating medium breakdown test platform for power frequency superimposed harmonics is built, so that the breakdown characteristic of the insulating medium under the action of the power frequency superimposed harmonics can be researched, the voltage condition under the actual application scene is simulated, and the important significance is realized on the breakdown of the medium under the condition of the power frequency superimposed harmonics.
In the device proposed in this embodiment, the voltage measurement circuit is specifically configured to measure the superimposed voltage across the insulating medium and the magnitude of the superimposed voltage at the time of the final breakdown.
The embodiment is an insulation medium breakdown test platform of power frequency superposed harmonic, the power frequency voltage amplitude is adjustable, the harmonic voltage frequency and the harmonic voltage amplitude are both adjustable, the voltage and the frequency which can be sufficiently subjected to dielectric breakdown can be output, the system capacity can also be met under high frequency, and after the insulation medium is broken down, the generated breakdown current respectively forms a loop through a power frequency voltage generating circuit and a harmonic voltage generating circuit, so that equipment can be reliably protected from being damaged after the insulation medium is broken down.
Preferably, the power frequency voltage and the harmonic voltage are synchronously applied to two ends of the insulating medium through a capacitance bridge circuit. Optionally, the capacitor bridge circuit may be replaced by a high voltage electrode and a low voltage electrode, and the power frequency voltage and the harmonic voltage may be applied to both ends of the insulating medium directly through the high voltage electrode and the low voltage electrode. Specifically, as shown in fig. 2, the output ends of the power frequency voltage generating circuit and the harmonic voltage generating circuit are connected to the high-voltage electrode, the low-voltage electrode is grounded, the insulating medium is broken down under the action of the superposition of the power frequency voltage and the harmonic voltage, and a universal meter is used for displaying the voltage.
Preferably, as shown in fig. 3, the capacitor bridge circuit includes a first voltage-dividing capacitor C1A second voltage dividing capacitor C2And a third voltage dividing capacitor C3Insulating medium and protective resistor Rx(ii) a One end of the output side of the power frequency voltage generating circuit is connected with a first voltage division capacitor C1And a third partial capacitance C3The other end is connected to a second voltage-dividing capacitor C2And an insulating medium; one end of the output side of the harmonic voltage generating circuit is connected with a protective resistor RxAnd a third partial capacitance C3The other end is connected to a first voltage-dividing capacitor C1And a second voltage dividing capacitor C2In the meantime.
Preferably, as shown in fig. 2 and 3, the power frequency voltage generation circuit includes a voltage regulator, a booster and a first switch. The voltage regulator is connected with the mains supply, and the mains supply is subjected to amplitude adjustment by the voltage regulator, then is subjected to voltage boosting by the voltage booster, and is applied to two ends of the insulating medium under the condition that the first switch is switched on.
Preferably, the power frequency voltage generating circuit further comprises a current limiting resistor connected in series with the first switch.
Preferably, as shown in fig. 2 and 3, the harmonic voltage generating circuit includes an ac variable frequency power supply, an intermediate frequency transformer, and a second switch. The alternating current variable frequency power supply is connected with a mains supply, and the mains supply is subjected to frequency and amplitude adjustment by the alternating current variable frequency power supply, then is subjected to voltage boosting by the intermediate frequency transformer, and is applied to two ends of the insulating medium under the condition that the second switch is switched on.
Preferably, the rated frequency range of the intermediate frequency transformer is 50-500 Hz, the rated capacity is 24kVA, the rated voltage range of the secondary side is 0-12 kV, the rated current range of the secondary side is 0-2A, and the turn ratio of the coil is 1: 30.
The transformer design principle provided by the embodiment is to meet the requirement that the maximum output voltage of the transformer can reach the voltage required by dielectric breakdown, the current after the dielectric breakdown cannot exceed the maximum output current of the transformer, and meanwhile, the capacity of the transformer can meet the requirement. According to the superposition theorem of circuit theory, the power frequency superposition harmonic circuit can be regarded as the superposition of a power frequency voltage module and a harmonic voltage module, when an intermediate frequency transformer in the harmonic voltage module is considered, the output of the power frequency voltage module can be regarded as a short circuit, and the circuit for breaking down the module is changed into the parallel connection of two branches (one branch is C)1And C2In series, the other branch is composed of C3、CxAnd RxIn series), CxThe two ends divide the voltage into corresponding harmonic voltage according to the series-parallel connection of the circuit. With CxBreakdown voltage across CxThe current and voltage of the branch circuit are calculated to obtain C1And C2Current sum of branch circuit flowing through R2The current, i.e. the output current of the transformer, cannot exceed the maximum output current of the transformer; further calculate R2The maximum output voltage of the transformer is greater than the voltage value so as to meet the requirements; the capacity of the transformer at the moment can be calculated according to the output voltage and the output current of the transformer, and the capacity cannot exceed the rated capacity of the transformer. The value of the current limiting resistor isThe voltage across the resistor is large and occupies too much capacity if the current limiting is too large assuming that the dielectric breakdown voltage is constant, so that the output voltage and the capacity of the transformer are insufficient; if the current limiting resistance is too small, the breakdown current is too large, and the requirement cannot be met. The specific parameters of each device are determined according to the characteristics (breakdown field strength and thickness) of the insulating medium to be actually used and the number of harmonic voltages to be applied.
Therefore, the intermediate frequency transformer of the embodiment is different from a common test transformer in that the intermediate frequency transformer can perform a breakdown test of the insulating medium at a relatively high frequency, both the capacity and the voltage of the intermediate frequency transformer can meet the capacity and the voltage required by the breakdown of the insulating medium, and the current range of the intermediate frequency transformer can also ensure that the transformer cannot be damaged by a large current generated when the insulating medium is in a breakdown short circuit; the common test transformer can only perform breakdown test under power frequency generally, the common capacity and voltage can not be simultaneously met under high frequency, and the transformer can be damaged by large current generated when an insulating medium is broken down.
Preferably, as shown in fig. 3, the voltage measuring circuit comprises a resistance-capacitance voltage divider and an oscilloscope; two ends of the resistance-capacitance voltage divider are respectively connected with two ends of the insulating medium, and the oscilloscope is connected out of the resistance-capacitance voltage divider and used for displaying voltages at two ends of the insulating medium.
Example two
An insulation dielectric breakdown experiment method comprises the following steps:
constructing the insulation dielectric breakdown experiment device according to the first embodiment; respectively introducing commercial power to a power frequency voltage regulating generation circuit and a harmonic voltage generating circuit in the insulation dielectric breakdown experiment device, and sequentially controlling the power frequency voltage generating circuit to generate power frequency voltage with actually required voltage amplitude and the harmonic voltage generating circuit to generate harmonic voltage with actually required frequency value; and adjusting the amplitude of the harmonic voltage corresponding to the actual required frequency value generated by the harmonic voltage generating circuit until the insulation medium breaks down.
Firstly, according to the actual situation in the operation process of the power grid, the content of odd harmonics is generally more, such as 3-order harmonics, 5-order harmonics and the like, so the frequency of the harmonic voltage which is mainly superposed is the odd harmonics. In addition, the content of the harmonic voltage is lower than the content of the power frequency voltage under the actual condition, so that the power frequency voltage is generally added and kept unchanged when an experiment is carried out, then the harmonic voltage of a specific number of times is added, and the amplitude of the harmonic voltage is gradually increased until the insulation medium is broken down. If the harmonic voltage is added firstly and then the power frequency voltage is added, the time required for boosting is longer because the content of the power frequency voltage is higher, and the test time can be shortened by processing the frequency voltage and then the harmonic voltage. It should be noted that any ac voltage has a frequency, and when the voltage is applied, the frequency itself exists before the amplitude modulation value, but is not necessarily the actually required frequency, so that the frequency needs to be determined before the amplitude modulation value.
To better illustrate the working principle of the device of the present embodiment, the following examples are given:
s1, breaking down the insulating medium CxAre respectively reacted with C2And RxElectrically connecting;
s2: close the first switch S1Adjusting the voltage regulator to change the voltage output by the power frequency voltage generating circuit until the voltage reaches a preset value;
s3: closing the second switch S2Firstly, setting the frequency of an alternating current variable frequency power supply, and then adjusting the amplitude of the output of the alternating current variable frequency power supply until an insulating medium is broken down;
s4: monitoring the voltages at two ends of an insulating medium to be measured in real time through a resistance-capacitance voltage divider and a universal meter in a voltage measuring circuit;
s5: when the insulation dielectric breakdown is observed and obvious dielectric breakdown sound is heard, the voltage regulator in the power frequency transformation generating circuit is immediately zeroed, and the first switch S is disconnected1A second switch S2And an alternating current variable frequency power supply;
s6: reading the peak voltage of an oscilloscope in a voltage measuring circuit through video equipment;
s7: after the discharge is finished, the measured peak voltage U of the insulation dielectric breakdown2And calculating to obtain the breakdown field intensity E of the insulating medium. When the thickness of the insulating medium is d (square root)Often on the order of μm), a breakdown voltage of U2(in V), the breakdown field strength E of the insulating medium is U2/d。
It should be noted that the order of steps S2 and S3 may be changed. In addition, the capacitor element corresponding to the dielectric to be broken down used in this example has a capacitance c of 250nF, a total dielectric thickness d of 22 μm, and a second current limiting resistor R in the harmonic voltage generating circuit220k Ω, considering the fifth harmonic at 250Hz (frequency of applied harmonic voltage), when the dielectric breakdown voltage is U2At 3.5kV (Peak), the impedance of the capacitor element is
Secondary side breakdown current of intermediate frequency transformer in harmonic voltage generating circuit is
Effective value is 0.97A, and output voltage of the intermediate frequency transformer is
The total capacity of the intermediate frequency transformer is Q ═ U · I227.7 × 1.37/2 ═ 18.97 kVA. In the example, the current, the voltage and the capacity are all within the allowable range of the medium-frequency transformer, while the capacity of the common high-voltage test transformer is generally lower, and the current range of the secondary side is not more than 1A, so that the high-voltage test transformer is not suitable for the breakdown test of the capacitor insulating medium under the high frequency.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An insulation dielectric breakdown experiment device, comprising: the device comprises a power frequency voltage generating circuit, a harmonic voltage generating circuit, an insulating medium to be punctured and a voltage measuring circuit;
the power frequency voltage generating circuit and the harmonic voltage generating circuit are respectively used for correspondingly generating power frequency voltage with adjustable amplitude and harmonic voltage with adjustable frequency and amplitude, and are superposed at two ends of the insulating medium, and the voltage measuring circuit is used for measuring the voltage at two ends of the insulating medium to obtain the breakdown voltage of the insulating medium;
after the insulation medium is broken down, the generated breakdown current passes through the power frequency voltage generating circuit and the harmonic voltage generating circuit to respectively form a loop.
2. The apparatus according to claim 1, wherein the power frequency voltage and the harmonic voltage are synchronously applied to two ends of the insulating medium through a capacitor bridge circuit.
3. The apparatus according to claim 2, wherein the capacitor bridge circuit comprises a first voltage-dividing capacitor, a second voltage-dividing capacitor, a third voltage-dividing capacitor, the insulating medium, and a protection resistor;
one end of the output side of the power frequency voltage generating circuit is connected between the first voltage-dividing capacitor and the third voltage-dividing capacitor, and the other end of the output side of the power frequency voltage generating circuit is connected between the second voltage-dividing capacitor and the insulating medium; one end of the output side of the harmonic voltage generation circuit is connected between the protection resistor and the third voltage division capacitor, and the other end of the output side of the harmonic voltage generation circuit is connected between the first voltage division capacitor and the second voltage division capacitor.
4. The insulation medium breakdown experiment device according to claim 1, wherein the power frequency voltage generation circuit comprises a voltage regulator, a voltage booster and a first switch;
the voltage regulator is connected with a mains supply, and the mains supply is subjected to amplitude adjustment of the voltage regulator and then is subjected to voltage boosting of the voltage booster, and the voltage is applied to two ends of the insulating medium under the condition that the first switch is switched on.
5. The apparatus according to claim 4, wherein the power frequency voltage generator circuit further comprises a first current limiting resistor connected in series with the first switch.
6. The insulation dielectric breakdown experiment device according to claim 1, wherein the harmonic voltage generation circuit comprises an alternating current variable frequency power supply, an intermediate frequency transformer and a second switch;
the alternating current variable frequency power supply is connected with a mains supply, and the mains supply is subjected to frequency and amplitude adjustment and then is boosted by the intermediate frequency transformer and applied to two ends of the insulating medium under the condition that the second switch is switched on.
7. The insulation medium breakdown experiment device of claim 6, wherein the rated frequency range of the intermediate frequency transformer is 50-500 Hz, the rated capacity is 24kVA, the rated voltage range of the secondary side is 0-12 kV, the rated current range of the secondary side is 0-2A, and the turn ratio of the coil is 1: 30.
8. The apparatus according to claim 6, wherein the harmonic voltage generating circuit further comprises a second current limiting resistor connected in series with the second switch.
9. The insulation dielectric breakdown experiment device of claim 1, wherein the voltage measurement circuit comprises a resistance-capacitance voltage divider and an oscilloscope; and two ends of the resistance-capacitance voltage divider are respectively connected with two ends of the insulating medium, and the oscilloscope is connected out of the resistance-capacitance voltage divider and used for displaying the voltages at the two ends of the insulating medium.
10. An insulation dielectric breakdown experiment method, comprising:
building an insulation dielectric breakdown experiment device according to any one of claims 1 to 9;
respectively introducing commercial power to a power frequency voltage regulating generation circuit and a harmonic voltage generation circuit in the insulation dielectric breakdown experiment device, and sequentially controlling the power frequency voltage generation circuit to generate power frequency voltage with actually required voltage amplitude and the harmonic voltage generation circuit to generate harmonic voltage with actually required frequency value;
and adjusting the amplitude of the harmonic voltage corresponding to the actual required frequency value generated by the harmonic voltage generating circuit until the insulation medium breaks down.
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| CN113092968A (en) * | 2021-04-14 | 2021-07-09 | 哈尔滨理工大学 | Automatic testing system for AC/DC breakdown field intensity of film sample |
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