CN215526014U - Corona-resistant enameled wire partial discharge initial voltage test system - Google Patents
Corona-resistant enameled wire partial discharge initial voltage test system Download PDFInfo
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- CN215526014U CN215526014U CN202122333836.1U CN202122333836U CN215526014U CN 215526014 U CN215526014 U CN 215526014U CN 202122333836 U CN202122333836 U CN 202122333836U CN 215526014 U CN215526014 U CN 215526014U
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Abstract
The utility model discloses a corona-resistant enameled wire partial discharge initial voltage test system which comprises an upper computer and a corona-resistant enameled wire stranded wire sample Cx, wherein the upper computer is respectively connected with a high-frequency square wave pulse power supply and a microprocessor through serial ports, one end of the high-frequency square wave pulse power supply is connected with one end of the corona-resistant enameled wire stranded wire sample Cx through a lead, and the corona-resistant enameled wire partial discharge initial voltage test system relates to the technical field of corona-resistant enameled wire partial discharge tests. According to the corona-resistant enameled wire partial discharge initial voltage test system, the upper computer is used for controlling the high-frequency square wave pulse power supply of the corona-resistant tester to realize uniform automatic boosting, high-frequency instantaneous current generated by partial discharge is collected at the same time, the quick automatic test of the PDIV of the corona-resistant enameled wire is completed, the weak signal detection and the micro control technology are applied, the corona-resistant enameled wire partial discharge initial voltage is measured, the defect that an expensive test instrument is adopted for direct test in the prior art is overcome, and the test effect is improved.
Description
Technical Field
The utility model relates to the technical field of partial discharge testing of corona-resistant enameled wires, in particular to a partial discharge starting voltage testing system of a corona-resistant enameled wire.
Background
With the advent of the Pulse Width Modulation (PWM) technology, the alternating current speed regulation technology of the motor is rapidly developed. The variable frequency motor has the obvious advantages of good speed regulation performance, easy starting, high energy efficiency and the like, and is widely applied to the fields of high-speed railways, naval vessel driving, new energy vehicles, industrial production and the like.
However, when the inverter motor usually works at a high-frequency and rapidly-changing repeated high-frequency square wave pulse voltage, an insulation system of the inverter motor is subjected to harsher electrical stress, so that the service life of the inverter motor is far shorter than that of the inverter motor working at a power frequency alternating current.
Under the condition of repeated high-frequency square wave pulse, partial discharge signals are difficult to extract, partial discharge is generally submerged in strong electromagnetic interference generated by a rising edge and a falling edge, so that the partial discharge signals are difficult to extract, high-frequency instantaneous current is difficult to directly sample conventionally, expensive instruments such as a data acquisition card and an oscilloscope are generally required, therefore, a corona-resistant enameled wire partial discharge initial voltage test system is specially provided, weak signal detection and micro control technology is applied, the defect that the traditional test instruments such as the oscilloscope, ultrasonic waves and a spectrometer are adopted for direct test is overcome, and the test effect is improved.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a system for testing the partial discharge starting voltage of the corona-resistant enameled wire, which solves the problems.
In order to achieve the purpose, the utility model is realized by the following technical scheme: the corona-resistant enameled wire partial discharge initial voltage test system comprises an upper computer and a corona-resistant enameled wire stranded wire sample Cx, wherein the upper computer is respectively connected with a high-frequency square wave pulse power supply and a microprocessor through serial ports, one end of the high-frequency square wave pulse power supply is connected with one end of the corona-resistant enameled wire stranded wire sample Cx through a wire, the other end of the high-frequency square wave pulse power supply is connected with one end of a high-frequency current sensor HFCT through a wire, the other end of the corona-resistant enameled wire stranded wire sample Cx is connected with the other end of the high-frequency current sensor HFCT through a wire, the output end of the high-frequency current sensor HFCT is connected with a filter, the output end of the filter is connected with a detector through an amplifier, and the output end of the detector is connected with the microprocessor through an A/D conversion circuit.
Preferably, the high-frequency square wave pulse power supply specifically comprises a high-voltage power supply, a current-limiting resistor R, an insulated gate bipolar transistor IGBT and a load Cx.
Preferably, a high-voltage capacitor C1 is connected in parallel to an H-bridge in the insulated gate bipolar transistor IGBT.
Preferably, the pulse waveform generated by the high-frequency square wave pulse power supply is a bipolar square wave, and the peak value of the bipolar pulse voltage is 0-3 kV.
Preferably, the pulse frequency of the high-frequency square wave pulse power supply is 2-20kHz, and the pulse duty ratio of the high-frequency square wave pulse power supply is 50%.
Preferably, the rising time of the pulse edge of the high-frequency square wave pulse power supply and the falling time of the pulse edge are both 100ns +/-10%.
Advantageous effects
The utility model provides a system for testing partial discharge starting voltage of a corona-resistant enameled wire. Compared with the prior art, the method has the following beneficial effects:
this corona-resistant enameled wire partial discharge initial voltage test system, realize even automatic boost through the high-frequency square wave pulse power who uses the host computer to control corona-resistant tester, gather the high-frequency instantaneous current that partial discharge produced simultaneously, accomplish the quick automatic test of the PDIV of corona-resistant enameled wire, and utilize weak signal detection and miniature control technique, survey corona-resistant enameled wire partial discharge initial voltage, broken through the drawback that adopts expensive test instrument direct test before, the test effect has been promoted, and through detecting corona-resistant enameled wire partial discharge initial voltage, corona-resistant enameled wire electrical property can be known, and then make things convenient for corona enameled wire electrical property's promotion, and then for better solving inverter motor partial discharge problem, make its life increase provide the research data.
Drawings
FIG. 1 is a block diagram of the system test of the present invention;
FIG. 2 is a schematic diagram of a high frequency square wave pulse power supply of the present invention;
FIG. 3 is a waveform diagram of square wave pulse output according to the present invention;
FIG. 4 is a waveform of the sensor output when the load is 33pF capacitance according to the present invention;
FIG. 5 is a waveform diagram of the output of the sensor when the load is 1.0mm enameled wire according to the present invention;
FIG. 6 is a waveform diagram of the filtered output when the load is 33pF capacitor according to the present invention;
FIG. 7 is a waveform diagram of the output of the present invention after filtering when the load is 1.0mm enameled wire.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides the following technical solutions: the corona-resistant enameled wire partial discharge initial voltage test system comprises an upper computer and a corona-resistant enameled wire stranded wire sample Cx, wherein the upper computer is respectively connected with a high-frequency square wave pulse power supply and a microprocessor through serial ports, specifically, as shown in figure 2, the high-frequency square wave pulse power supply specifically comprises a high-voltage power supply, a current-limiting resistor R, an insulated gate bipolar transistor IGBT and a load Cx, wherein a high-voltage capacitor C1 is connected in parallel to an H bridge in the insulated gate bipolar transistor IGBT and used for providing instantaneous current for the load, one end of the high-frequency square wave pulse power supply is connected with one end of the corona-resistant enameled wire stranded wire sample Cx through a lead, the other end of the high-frequency square wave pulse power supply is connected with one end of a high-frequency current sensor HFCT through a lead, and the other end of the corona-resistant enameled wire stranded wire sample Cx is connected with the other end of the high-frequency current sensor HFCT through a lead, and the output end of the high-frequency current sensor HFCT is connected with a filter, the output end of the filter is connected with a detector through an amplifier, and the output end of the detector is connected with the microprocessor through an A/D conversion circuit.
Further, the pulse waveform generated by the high-frequency square wave pulse power supply is a bipolar square wave, the peak value of the bipolar pulse voltage is 0-3kV, the pulse frequency of the high-frequency square wave pulse power supply is 2-20kHz, the pulse duty ratio of the high-frequency square wave pulse power supply is 50%, the rising time and the falling time of the pulse edge of the high-frequency square wave pulse power supply are both 100ns +/-10%, and it needs to be noted that the voltage stability of the high-frequency square wave pulse power supply is less than or equal to 2%.
As shown in fig. 3, a waveform diagram at a frequency of 10kHz is generated for a high frequency square wave pulse power supply.
Further, the corona-resistant enameled wire has high instantaneous current frequency generated by partial discharge, and in order to extract a high-frequency current signal, the high-frequency current sensor needs to be made of nickel-zinc material with low magnetic permeability, when the peak value of the square wave pulse voltage is 1500V, the frequency is 10kHz, and the load is a 33pF capacitance sample, as shown in fig. 4, it is obvious that the partial discharge phenomenon does not occur when the load is a high-voltage capacitor, the steep rising edge and falling edge of the high-frequency square-wave pulse power supply can generate strong interference on the current sensor, when the frequency of the square-wave pulse is 10kHz, the interference frequency is 20kHz, when the peak value of square wave pulse voltage is 1500V, the frequency is 10kHz, and the load is an enameled wire stranded wire sample with the diameter of 1.0mm, as shown in fig. 5, it is apparent that the high frequency current signal generated by the partial discharge has a high frequency, mainly in the range of 80M-140 MHz.
Further, a high-pass filter with a cut-off frequency of 1MHz is used for suppressing the 20kHz interference, and waveforms of the output signals of the sensor after passing through the filter are shown in fig. 6 and 7, so that the interference is effectively suppressed.
In summary, the frequency of the high-frequency current signal generated by the partial discharge is mainly in the range of 80M-140MHz, the frequency is high, the common operational amplifier is difficult to meet the requirements, and a radio-frequency broadband amplifier is needed, so that a radio-frequency amplifier with the bandwidth of 1M-2GHz and the gain of 32dB is adopted, the signal intensity of the high-frequency current signal is increased after the high-frequency current signal is amplified, and the high-frequency current signal is converted into a low-frequency signal after the high-frequency current signal passes through a detector, so that the difficulty of sampling the partial discharge signal is greatly reduced.
And those not described in detail in this specification are well within the skill of those in the art.
When the device is used, the upper computer controls a high-frequency square wave pulse power supply to generate bipolar high-frequency square wave pulse voltage through a serial port, an instantaneous current signal acquired by a high-frequency current sensor HFCT passes through a filter, an amplifier, a detector and an A/D conversion circuit and then is sent to a microprocessor for storage to provide analysis data, in the process, the filter carries out filtering processing on the acquired instantaneous current signal containing pulse interference components to attenuate interference signals, when the square wave pulse voltage is lower, the filtered current signal is weaker and cannot be subjected to detection processing, the filtered signal is amplified to achieve the detection condition, wherein the square wave pulse voltage is subjected to data acquisition and storage once when being increased once, then the microprocessor processes the data and judges the partial discharge initial voltage PDIV of the corona-resistant enameled wire, specifically, and gradually increasing the high-frequency square wave pulse power supply from a lower voltage, sampling instantaneous current generated by detected partial discharge, and sending a test result to an upper computer for displaying and storing, wherein the square wave pulse voltage corresponds to the moment when the instantaneous current starts to increase faster, namely the partial discharge starting voltage of the corona-resistant enameled wire.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. Corona-resistant enameled wire partial discharge initial voltage test system, including host computer and corona-resistant enameled wire stranded conductor sample Cx, its characterized in that: the device comprises an upper computer, a high-frequency square wave pulse power supply and a microprocessor, wherein the upper computer is respectively connected with the high-frequency square wave pulse power supply and the microprocessor through serial ports, one end of the high-frequency square wave pulse power supply is connected with one end of a corona-resistant enameled wire stranded wire sample Cx through a wire, the other end of the high-frequency square wave pulse power supply is connected with one end of a high-frequency current sensor HFCT through a wire, the other end of the corona-resistant enameled wire stranded wire sample Cx is connected with the other end of the high-frequency current sensor HFCT through a wire, the output end of the high-frequency current sensor HFCT is connected with a filter, the output end of the filter is connected with a detector through an amplifier, and the output end of the detector is connected with the microprocessor through an A/D conversion circuit.
2. The corona-resistant enameled wire partial discharge starting voltage test system according to claim 1, characterized in that: the high-frequency square wave pulse power supply specifically comprises a high-voltage power supply, a current-limiting resistor R, an insulated gate bipolar transistor IGBT and a load Cx.
3. The corona-resistant enameled wire partial discharge starting voltage test system according to claim 2, characterized in that: and a high-voltage capacitor C1 is connected in parallel to an H bridge in the insulated gate bipolar transistor IGBT.
4. The corona-resistant enameled wire partial discharge starting voltage test system according to claim 2, characterized in that: the pulse waveform generated by the high-frequency square wave pulse power supply is bipolar square wave, and the peak value of bipolar pulse voltage is 0-3 kV.
5. The corona-resistant enameled wire partial discharge starting voltage test system according to claim 1, characterized in that: the pulse frequency of the high-frequency square wave pulse power supply is 2-20kHz, and the pulse duty ratio of the high-frequency square wave pulse power supply is 50%.
6. The corona-resistant enameled wire partial discharge starting voltage test system according to claim 1, characterized in that: the rising time of the pulse edge and the falling time of the pulse edge of the high-frequency square wave pulse power supply are both 100ns +/-10%.
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| CN202122333836.1U CN215526014U (en) | 2021-09-26 | 2021-09-26 | Corona-resistant enameled wire partial discharge initial voltage test system |
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| CN202122333836.1U CN215526014U (en) | 2021-09-26 | 2021-09-26 | Corona-resistant enameled wire partial discharge initial voltage test system |
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