CN117907774A - Stepped variable frequency partial discharge online monitoring method and device for high-voltage variable frequency motor - Google Patents
Stepped variable frequency partial discharge online monitoring method and device for high-voltage variable frequency motor Download PDFInfo
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Abstract
The invention discloses a stepped variable frequency partial discharge on-line monitoring method and device for a high-voltage variable frequency motor, and relates to the field of high-voltage variable frequency motor operation. The stepped variable frequency partial discharge on-line monitoring method and device for the high-voltage variable frequency motor have the function of real-time on-line monitoring, can check the maximum value condition of the QM of each high-voltage variable frequency motor in real time, are convenient for operation and maintenance personnel to check the latest 24-hour QM amplitude of each unit, and can effectively monitor and process the discharge condition of the high-voltage variable frequency motor based on the provided functions of data query, data analysis, diagnosis and monitoring report.
Description
Technical Field
The invention relates to the field of high-voltage variable frequency motor operation, in particular to a stepped variable frequency partial discharge on-line monitoring method and device for a high-voltage variable frequency motor.
Background
Due to the development of modern detection technology, through detecting physical quantities such as electromagnetic waves, sound waves, light waves, temperature and the like generated by partial discharge of electrical equipment, processing and comprehensively analyzing the monitoring information, and simultaneously predicting the development trend of insulation degradation according to the magnitude and the change trend of the numerical value of the monitoring information, the continuous monitoring and analysis of the equipment in an operation state are realized, and the scheme mainly applied at present is as follows: a temperature measurement method; a ground wire current method; partial discharge detection method.
In the existing method mainly adopted, the temperature monitoring method can reflect the insulation state, but the method cannot reflect the initial development trend and the degradation process of insulation degradation, and the method is more capable of reflecting the aging result of electrical equipment and cannot effectively detect the aging process of the equipment; the earth wire current method can be primarily judged to be caused by the insulation degradation of the electrical equipment, the method is suitable for conducting insulation on-line detection on the electrical equipment with single-point grounding, the reliability of the technology is poor, the initial fault of the insulation cannot be detected, the initial fault cannot be monitored and trend analysis is formed by both methods, and the running state of the equipment is a serious missing point.
The technical problem mainly aimed at in the patent of the invention is that the operation of the high-voltage variable frequency motor is in a stepped frequency changing application scene, and the high-voltage variable frequency motor can stably operate for 20 minutes or more under certain fixed frequencies, such as 25Hz, 34Hz and 45Hz, wherein the two main technical difficulties are as follows:
Difficulty one: the operation frequency of the high-voltage variable frequency motor is continuously changed, the original fixed frequency motor is difficult to acquire a partial discharge state synchronous signal and finish accurate measurement by adopting a technology of monitoring by three EMC couplers, a fourth synchronous capacitor partial pressure coupler is innovatively added in an application scene of the high-voltage variable frequency motor and is mainly used for acquiring the operation frequency of the high-voltage variable frequency motor, the fourth synchronous capacitor partial pressure coupler is used as a synchronous reference signal for determining the phase of partial discharge, the respective working time data and rules of the high-voltage variable frequency motor at different rotation speeds are counted according to different conditions of the operation rotation speeds of the field tested high-voltage variable frequency motor, and according to the rotation speed rules and the stabilization time of the rotation speed rules, the acquisition mechanism is triggered in the stabilization time range and the high-frequency pulse signal requirement of relevant partial discharge is effectively acquired, so that the purpose of continuously acquiring a target signal is realized.
Difficulty two: the interference of higher harmonics generated by frequency conversion in the high-voltage variable-frequency motor on partial discharge signals to be acquired is innovatively utilized on the basis of adding a fourth coupler, filters with different frequencies, such as 500kHz, 1MHz, 2MHz, 5MHz, 10MHz and 20MHz, can be selected according to the actual situation of the high-voltage variable-frequency motor, and the specifications of the selected filters are matched after the interference signals are measured by using an oscilloscope; the interference signals are restrained by the analysis filters, so that the most suitable filters aiming at different high-voltage variable frequency motors are found out and fixedly installed, and finally effective data are continuously acquired.
The innovation measures for solving the two main technical difficulties are technical breakthroughs in the industry, have important significance of the scene technological innovation, and then further evaluate the partial discharge state after the relevant data of the high-voltage variable frequency motor are accumulated, and realize long-term trend monitoring.
Therefore, it is necessary to provide a method and a device for online monitoring stepped variable frequency partial discharge of a high-voltage variable frequency motor to solve the above problems.
Disclosure of Invention
The invention mainly aims to provide a stepped variable frequency partial discharge on-line monitoring method and device for a high-voltage variable frequency motor, which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The step-type variable frequency partial discharge on-line monitoring method for the high-voltage variable frequency motor comprises the following operation steps:
S1: building a high-voltage variable frequency motor partial discharge monitoring system: the system comprises a high-voltage variable frequency motor, a frequency converter, a voltage division synchronous reference signal coupler, a junction box, a capacitive coupler, a terminal box, a filter, a partial discharge acquisition device, a network switch, a system server, a display, a special signal transmission cable, a coaxial cable, a twisted pair and a network cable;
S2: mounting of the coupler: a capacitor coupler is respectively arranged at the three-phase high-voltage side in a power connection box of the high-voltage variable-frequency motor, and a voltage division synchronous reference signal coupler is additionally arranged on any one of the three phases of high-voltage side connection posts and is additionally arranged as a special synchronous voltage division reference signal coupler of the high-voltage variable-frequency motor;
S3: signal output of the capacitive coupler: the output end of the capacitive coupler is connected to the terminal box by adopting a special signal transmission cable, and a signal output by the terminal box is connected with the filter through a coaxial cable and then connected with the partial discharge acquisition device;
s4: signal output of the voltage division synchronous reference signal coupler: the output end of the partial pressure synchronous reference signal coupler is connected to a junction box through a twisted pair, then is connected to a terminal box, and is connected with a synchronous signal port of the partial discharge acquisition device through a coaxial cable from the terminal box, and an output signal of the partial discharge acquisition device is connected to a system server through a network cable, so that the on-line monitoring of partial discharge data is realized.
Preferably, in the step S1, the voltage division synchronous reference signal coupler and the capacitive coupler are both EMC couplers, the partial discharge acquisition device is a partial discharge monitoring host PDTrac ii, and the system server is a partial discharge data acquisition analysis workstation.
Preferably, in the steps S2 and S3, the capacitive coupler for collecting signals and the voltage division synchronous reference signal coupler installed on each phase winding of the high-voltage variable frequency motor are distinguished according to different waveform attenuation changes of the partial discharge signal and the system noise signal of the high-voltage variable frequency motor.
Preferably, the filter is used for suppressing interference of higher harmonics on the collected partial discharge signals, and before the filter is installed, the practical oscilloscope measures the interference signals of the high-voltage variable frequency motor, and the filter with the best suppression effect on the interference signals is matched and selected according to measurement data for fixed installation.
The utility model provides a high-voltage variable frequency motor cascaded frequency conversion partial discharge on-line monitoring device, is applied to a high-voltage variable frequency motor cascaded frequency conversion partial discharge on-line monitoring method, includes high-voltage variable frequency motor, converter, partial pressure synchronous reference signal coupler, terminal box, electric filter, partial discharge collection system, network switch, system server, display, special signal transmission cable, coaxial cable, paired line, net twine, partial discharge collection system includes software PDTracPro, data viewing software PDView and chinese software on-line installation.
Preferably, one high-voltage variable frequency motor is provided with three capacitive couplers and one synchronous voltage division reference signal coupler, the capacitive couplers are arranged on the high-voltage side of three phases in a junction box of the high-voltage variable frequency motor, and the synchronous voltage division reference signal couplers are arranged on any one phase high-voltage side connecting column of the three phases in the high-voltage variable frequency motor.
Preferably, the output end of the capacitive coupler is electrically connected with the input end of the terminal box through a special signal transmission cable, the output end of the terminal box is electrically connected with the input end of the filter and the partial discharge acquisition device through a coaxial cable, the output end of the synchronous partial pressure reference signal coupler is electrically connected with the input end of the junction box through a twisted pair, the output end of the junction box is electrically connected with the input end of the terminal box, the output end of the terminal box is connected with the synchronous signal port of the partial discharge acquisition device through the coaxial cable, and the output end of the partial discharge acquisition device is electrically connected with the system server through a network cable.
Preferably, the partial discharge collection device is used for partial discharge QM trend analysis, early warning times statistics, phase analysis, analysis report, fault diagnosis report, wherein:
Partial discharge QM trend analysis: trend analysis is carried out based on options of day, month and year, and the trend analysis is used for gradually selecting a certain phase of a certain high-voltage variable-frequency motor to select and generate a trend chart, so that the selection is more diversified, the trend analysis is more refined, and the obtained result is more reliable;
Counting early warning times: the method is used for inquiring the early warning times of each phase of each unit in the self-selection time range, observing the insulation condition of the high-voltage variable frequency motor in the selection range on the whole and knowing the running state of the high-voltage variable frequency motor;
phase analysis: the data checking software PDView has a phase analysis function of the partial discharge data, and is used for carrying out phase analysis on signals acquired by the host on line, displaying 3D data and improving the accuracy and convenience of the partial discharge analysis;
Analysis report: software PDTracPro analyzes the data to provide a specialized template and generate and print a report, the print report comprising: the monitoring report and the fault diagnosis report are used for manually selecting time spans, generating the monitoring report in the corresponding time spans, and printing the content of the report including all monitored information of the host computer, including partial discharge amplitude trend, partial discharge times and phase analysis;
Fault diagnosis report: and carrying out fault diagnosis on the partial discharge data in the selected time span according to the phase analysis and the analysis report, and displaying the basic types of faults to prompt help field staff to quickly react and reduce related losses.
Advantageous effects
Compared with the prior art, the invention provides a stepped variable frequency partial discharge on-line monitoring method and device for a high-voltage variable frequency motor, which have the following beneficial effects:
1. The stepped variable frequency partial discharge on-line monitoring method and device for the high-voltage variable frequency motor have the function of real-time on-line monitoring, can check the maximum value condition of the QM of each high-voltage variable frequency motor in real time, are convenient for operation and maintenance personnel to check whether the QM amplitude of each unit for 24 hours is in a normal state or not, and if the QM amplitude is higher, the highest-occurrence phase of the QM value is needed to be positioned through a data query function.
2. The stepped variable frequency partial discharge on-line monitoring method and the device for the high voltage variable frequency motor can perform data query of the operation of the high voltage variable frequency motor according to the high voltage variable frequency motor and the measurement type, can perform analysis of the operation state of the high voltage variable frequency motor based on a QM graph and early warning times, can perform automatic analysis on the data through a diagnosis report, and can perform scientific calculation according to the association relation between the data which is established by a mathematical model, deduce principles and methods, so that the unit partial discharge state can be accurately judged, and the unit partial discharge state can be comprehensively judged by analyzing the current high voltage variable frequency motor unit partial discharge condition.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge monitoring system of a high-voltage variable frequency motor according to the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1, the step-type variable frequency partial discharge on-line monitoring method of the high-voltage variable frequency motor comprises the following operation steps:
s1: building a high-voltage variable frequency motor partial discharge monitoring system: the system comprises a high-voltage variable frequency motor, a frequency converter, a voltage division synchronous reference signal coupler, a junction box, a capacitive coupler, a terminal box, a filter, a partial discharge acquisition device, a network switch, a system server, a display, a special signal transmission cable, a coaxial cable, a twisted pair wire and a network cable, wherein the voltage division synchronous reference signal coupler and the capacitive coupler are EMC couplers, the partial discharge acquisition device is a partial discharge monitoring host PDTrac II, and the system server is a partial discharge data acquisition analysis workstation;
S2: mounting of the coupler: a capacitor coupler is respectively arranged at the three-phase high-voltage side in a power connection box of the high-voltage variable-frequency motor, and a voltage division synchronous reference signal coupler is additionally arranged on any one of the three phases of high-voltage side connection posts and is additionally arranged as a special synchronous voltage division reference signal coupler of the high-voltage variable-frequency motor;
S3: signal output of the capacitive coupler: the output end of the capacitive coupler is connected to the terminal box by adopting a special signal transmission cable, signals output by the terminal box are connected with a filter through a coaxial cable and then are connected with a partial discharge acquisition device, the capacitive coupler for acquiring signals and a partial pressure synchronous reference signal coupler which are arranged on each phase of winding of the high-voltage variable frequency motor are distinguished according to different waveform attenuation changes of partial discharge signals of the high-voltage variable frequency motor and system noise signals, the filter is used for restraining interference of higher harmonics on the acquired partial discharge signals, and before the filter is arranged, the filter with the best suppression effect on the interference signals is selected for fixed installation according to measurement data matching, the interference signals of the high-voltage variable frequency motor are measured by the practical oscilloscope;
s4: signal output of the voltage division synchronous reference signal coupler: the output end of the partial pressure synchronous reference signal coupler is connected to a junction box through a twisted pair, then is connected to a terminal box, and is connected with a synchronous signal port of the partial discharge acquisition device through a coaxial cable from the terminal box, and an output signal of the partial discharge acquisition device is connected to a system server through a network cable, so that the on-line monitoring of partial discharge data is realized.
As shown in FIG. 1, the stepped variable frequency partial discharge on-line monitoring device of the high voltage variable frequency motor is applied to a stepped variable frequency partial discharge on-line monitoring method of the high voltage variable frequency motor, and comprises the high voltage variable frequency motor, a frequency converter, a voltage division synchronous reference signal coupler, a junction box, a capacitor coupler, a terminal box, a filter, a partial discharge acquisition device, a network switch, a system server, a display, a special signal transmission cable, a coaxial cable, twisted pairs and network wires, wherein the partial discharge acquisition device comprises software PDTracPro, data viewing software PDView and Chinese software which are installed on line, the high voltage variable frequency motor is provided with three capacitor couplers and one synchronous voltage division reference signal coupler, the capacitor coupler is installed on the high voltage side of three phases in the junction box of the high voltage variable frequency motor, the synchronous voltage reference signal coupler is installed on any one same high voltage side junction column in the three phases in the high voltage variable frequency motor, the output end of the capacitor coupler is electrically connected with the input end of the terminal box through the special signal transmission cable, the output end of the terminal box is electrically connected with the input end of the filter and the twisted pairs of the local discharge acquisition device through the coaxial cable, the output end of the synchronous reference signal coupler is electrically connected with the input end of the local discharge acquisition device through the coaxial cable, and the output end of the output system of the synchronous voltage reference signal coupler is electrically connected with the input end of the input of the terminal box through the input device through the input of the system.
The partial discharge acquisition device is used for partial discharge QM trend analysis, early warning frequency statistics, phase analysis, analysis report and fault diagnosis report, wherein:
Partial discharge QM trend analysis: trend analysis is carried out based on options of day, month and year, and the trend analysis is used for gradually selecting a certain phase of a certain high-voltage variable-frequency motor to select and generate a trend chart, so that the selection is more diversified, the trend analysis is more refined, and the obtained result is more reliable;
Counting early warning times: the method is used for inquiring the early warning times of each phase of each unit in the self-selection time range, observing the insulation condition of the high-voltage variable frequency motor in the selection range on the whole and knowing the running state of the high-voltage variable frequency motor;
phase analysis: the data checking software PDView has a phase analysis function of the partial discharge data, and is used for carrying out phase analysis on signals acquired by the host on line, displaying 3D data and improving the accuracy and convenience of the partial discharge analysis;
Analysis report: software PDTracPro analyzes the data to provide a specialized template and generate and print a report, the print report comprising: the monitoring report and the fault diagnosis report are used for manually selecting time spans, generating the monitoring report in the corresponding time spans, and printing the content of the report including all monitored information of the host computer, including partial discharge amplitude trend, partial discharge times and phase analysis;
Fault diagnosis report: and carrying out fault diagnosis on the partial discharge data in the selected time span according to the phase analysis and the analysis report, and displaying the basic types of faults to prompt help field staff to quickly react and reduce related losses.
The invention relates to a stepped variable frequency partial discharge on-line monitoring method and device for a high-voltage variable frequency motor.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A stepped variable frequency partial discharge on-line monitoring method for a high-voltage variable frequency motor is characterized by comprising the following steps of: the method comprises the following operation steps:
S1: building a high-voltage variable frequency motor partial discharge monitoring system: the system comprises a high-voltage variable frequency motor, a frequency converter, a voltage division synchronous reference signal coupler, a junction box, a capacitive coupler, a terminal box, a filter, a partial discharge acquisition device, a network switch, a system server, a display, a special signal transmission cable, a coaxial cable, a twisted pair and a network cable;
S2: mounting of the coupler: a capacitor coupler is respectively arranged at the three-phase high-voltage side in a power connection box of the high-voltage variable-frequency motor, and a voltage division synchronous reference signal coupler is additionally arranged on any one of the three phases of high-voltage side connection posts and is additionally arranged as a special synchronous voltage division reference signal coupler of the high-voltage variable-frequency motor;
S3: signal output of the capacitive coupler: the output end of the capacitive coupler is connected to the terminal box by adopting a special signal transmission cable, and a signal output by the terminal box is connected with the filter through a coaxial cable and then connected with the partial discharge acquisition device;
s4: signal output of the voltage division synchronous reference signal coupler: the output end of the partial pressure synchronous reference signal coupler is connected to a junction box through a twisted pair, then is connected to a terminal box, and is connected with a synchronous signal port of the partial discharge acquisition device through a coaxial cable from the terminal box, and an output signal of the partial discharge acquisition device is connected to a system server through a network cable, so that the on-line monitoring of partial discharge data is realized.
2. The online monitoring method for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 1, which is characterized by comprising the following steps of: in the step S1, the voltage division synchronous reference signal coupler and the capacitive coupler are both EMC couplers, the partial discharge acquisition device is a partial discharge monitoring host PDTrac ii, and the system server is a partial discharge data acquisition analysis workstation.
3. The online monitoring method for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 1, which is characterized by comprising the following steps of: in the steps S2 and S3, the capacitive coupler and the voltage division synchronous reference signal coupler for collecting signals are installed on each phase winding of the high-voltage variable frequency motor, and the high-voltage variable frequency motor is distinguished according to different waveform attenuation changes of partial discharge signals and system noise signals of the high-voltage variable frequency motor.
4. The online monitoring method for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 1, which is characterized by comprising the following steps of: the filter is used for suppressing interference of higher harmonic waves on the collected partial discharge signals, and before the filter is installed, the practical oscilloscope measures interference signals of the high-voltage variable frequency motor, and the filter with the best suppression effect on the interference signals is matched and selected according to measurement data to be fixedly installed.
5. The utility model provides a high-voltage variable frequency motor cascaded frequency conversion partial discharge on-line monitoring device, is applied to a high-voltage variable frequency motor cascaded frequency conversion partial discharge on-line monitoring method, includes high-voltage variable frequency motor, converter, partial pressure synchronous reference signal coupler, terminal box, electric filter, partial discharge collection system, network switch, system server, display, special signal transmission cable, coaxial cable, paired line, net twine, its characterized in that: the partial discharge acquisition device comprises software PDTracPro, data viewing software PDView and Chinese software on-line installation.
6. The on-line monitoring device for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 5, wherein: and three capacitive couplers and one synchronous voltage division reference signal coupler are arranged on the high-voltage side of three phases in the junction box of the high-voltage variable-frequency motor, and the synchronous voltage division reference signal coupler is arranged on any one phase high-voltage side terminal post of the three phases in the high-voltage variable-frequency motor.
7. The on-line monitoring device for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 8, wherein: the output end of the capacitive coupler is electrically connected with the input end of the terminal box through a special signal transmission cable, the output end of the terminal box is electrically connected with the input ends of the filter and the partial discharge acquisition device through a coaxial cable, the output end of the synchronous partial pressure reference signal coupler is electrically connected with the input end of the junction box through a twisted pair, the output end of the junction box is electrically connected with the input end of the terminal box, the output end of the terminal box is connected with the synchronous signal port of the partial discharge acquisition device through the coaxial cable, and the output end of the partial discharge acquisition device is electrically connected with the system server through a network cable.
8. The on-line monitoring device for stepped variable frequency partial discharge of a high-voltage variable frequency motor according to claim 5, wherein: the partial discharge acquisition device is used for partial discharge QM trend analysis, early warning frequency statistics, phase analysis, analysis report and fault diagnosis report, wherein:
Partial discharge QM trend analysis: trend analysis is carried out based on options of day, month and year, and the trend analysis is used for gradually selecting a certain phase of a certain high-voltage variable-frequency motor to select and generate a trend chart, so that the selection is more diversified, the trend analysis is more refined, and the obtained result is more reliable;
Counting early warning times: the method is used for inquiring the early warning times of each phase of each unit in the self-selection time range, observing the insulation condition of the high-voltage variable frequency motor in the selection range on the whole and knowing the running state of the high-voltage variable frequency motor;
phase analysis: the data checking software PDView has a phase analysis function of the partial discharge data, and is used for carrying out phase analysis on signals acquired by the host on line, displaying 3D data and improving the accuracy and convenience of the partial discharge analysis;
Analysis report: software PDTracPro analyzes the data to provide a specialized template and generate and print a report, the print report comprising: the monitoring report and the fault diagnosis report are used for manually selecting time spans, generating the monitoring report in the corresponding time spans, and printing the content of the report including all monitored information of the host computer, including partial discharge amplitude trend, partial discharge times and phase analysis;
Fault diagnosis report: and carrying out fault diagnosis on the partial discharge data in the selected time span according to the phase analysis and the analysis report, and displaying the basic types of faults to prompt help field staff to quickly react and reduce related losses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410183112.9A CN117907774A (en) | 2024-02-19 | 2024-02-19 | Stepped variable frequency partial discharge online monitoring method and device for high-voltage variable frequency motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410183112.9A CN117907774A (en) | 2024-02-19 | 2024-02-19 | Stepped variable frequency partial discharge online monitoring method and device for high-voltage variable frequency motor |
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