CN111781475B - Partial discharge pulse sequence simulation device based on Marx generator - Google Patents
Partial discharge pulse sequence simulation device based on Marx generator Download PDFInfo
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- CN111781475B CN111781475B CN202010725480.3A CN202010725480A CN111781475B CN 111781475 B CN111781475 B CN 111781475B CN 202010725480 A CN202010725480 A CN 202010725480A CN 111781475 B CN111781475 B CN 111781475B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The application discloses partial discharge pulse sequence simulation device based on marx generator includes: the partial discharge spectrum database is used for generating different discharge signals through the PRPD spectrum database and outputting the different discharge signals to the input module; the input module is used for inputting the power supply and the characteristic information of each pulse of the partial discharge pulse sequence to be simulated to the partial discharge pulse sequence generation module; the partial discharge pulse sequence generation module outputs an ignition signal and a micro-motor action signal for controlling the Marx generator set according to the characteristic information; the synchronous trigger module is used for outputting a sine synchronous signal to the PDMI module. The method solves the technical problems that the programmable partial discharge calibrator in the prior art expands a plurality of functions, such as the performance defined on standards of pulse sequence response, pulse resolution and the like, but all the processes are only used for calibrating and evaluating the measured charge, and the evaluation of the performance advanced calibrator is still blank.
Description
Technical Field
The application relates to the technical field of high-voltage insulation, in particular to a partial discharge pulse sequence simulation device based on a Marx generator.
Background
Partial discharge is an important cause of insulation fault of power equipment, partial discharge phenomena are deeply researched, a partial discharge detection method is explored, and implementation of partial discharge live detection and online monitoring is an important means for guaranteeing safe, reliable and stable operation of the power equipment. Because the partial discharge actually generated in the power equipment has randomness and uncontrollable property, the partial discharge detection device becomes an important tool for partial discharge research, especially experimental research. The partial discharge detection device becomes an important tool for partial discharge research, particularly experimental research. The detection, localization and diagnosis of partial discharges are essential tasks for the evaluation of the insulation condition of high-voltage electrical equipment.
At present, a high-voltage test system is adopted by a laboratory to simulate partial discharge to match with various true partial discharge test models to simulate a discharge map, and the problems that the laboratory is large in size, cannot move, can only test in specific environments such as a high-voltage hall and the like, test equipment is difficult to build, the test period is long, a test power supply is in a single form such as a power frequency or direct current hall and the like exist. Partial Discharge Measurement Instruments (PDMIs, Partial Discharge Measurement Instruments) have been developed for a long time, have been digitized, and can be used for realizing operations such as Partial Discharge recognition. For the partial discharge, the existence and the severity of the partial discharge can only be judged by depending on the index of the apparent charge quantity, and the relationship between the high voltage applied by the partial discharge and the amplitude and phase angle distribution of each pulse in the pulse sequence and the frequency spectrum of the partial discharge pulse waveform cannot be analyzed. More details need to be obtained by analyzing the relationship between the applied high voltage and the amplitude and phase angle distribution of each pulse in the pulse train by a prpd (phase Resolved partial discharge) map. In order to eliminate interference and suppress noise so as to realize classification and identification of partial discharge types, statistical or time domain analysis can be carried out by carrying out a digital signal processing method on the obtained partial discharge pulse sequence.
PDMIs can enable live testing and insulation diagnostics in the field and are not limited to laboratory testing. The traditional partial discharge calibrator can only output charge pulses with known discharge quantity at a fixed repetition frequency, and can verify the characteristics of linearity, polarity influence and the like of the partial discharge calibrator. In contrast, programmable partial discharge calibrators extend many functions, such as performance defined on standards such as pulse train response and pulse resolution, but all of the above processes are only for calibration and evaluation of the measured apparent charge, and evaluation in performance advanced instruments is still blank.
Disclosure of Invention
The application provides a partial discharge pulse sequence simulation device based on a Marx generator, which solves the technical problems that a programmable partial discharge calibrator in the prior art expands a plurality of functions, such as performance defined on standards of pulse sequence response, pulse resolution and the like, but all the processes are only aimed at calibration and evaluation of measured apparent charges, and evaluation of an advanced performance instrument is still blank.
The application provides a partial discharge pulse sequence simulation device based on marx generator includes:
the device comprises an input module, a partial discharge pulse sequence generation module, a synchronous trigger module and a PDMI module;
the partial discharge pulse sequence generation module and the synchronous trigger module are both connected with the PDMI module;
the partial discharge spectrum database is used for generating different discharge signals through the PRPD spectrum database and outputting the different discharge signals to the input module; the PRPD map data is discharge map integration generated by partial discharge electrification detection, digital simulation and simulation experiments;
the input module is used for inputting the power supply and the characteristic information of each pulse of the partial discharge pulse sequence to be simulated to the partial discharge pulse sequence generation module;
the partial discharge pulse sequence generation module outputs an ignition signal and a micro-motor action signal for controlling a Marx generator set according to the characteristic information, and outputs a pulse sequence matched with the partial discharge pulse sequence to be simulated to the PDMI module;
the synchronous trigger module is used for outputting a sine synchronous signal to the PDMI module.
Optionally, the partial discharge map simulation module includes a graphical interface for receiving information input by a user.
Optionally, the characteristic information includes an amplitude, a polarity, a pulse phase angle or a pulse generation time of each pulse, and a time-frequency parameter of each pulse.
Optionally, the partial discharge pulse sequence generating module includes a control unit and the marx generator set, where the control unit is configured to receive the characteristic information and output the ignition signal and the micro-motor action signal to the marx generator set.
Optionally, the synchronization triggering module comprises a low pass filter for forming the coupled signals into a synchronization sinusoidal signal.
Optionally, the partial discharge pulse sequence generating module further includes an ignition signal generating circuit, and the ignition signal generating circuit is connected to the control unit and the marx generator set and configured to generate an ignition signal.
Optionally, the marx generator set includes a plurality of parallel marx generators, each of which is connected to a micro-motor for controlling the last spark gap of each of the marx generators.
Optionally, the control unit comprises an embedded controller.
According to the technical scheme, the method has the following advantages:
in this application, a partial discharge pulse sequence simulation device based on a marx generator is provided, including:
the device comprises an input module, a partial discharge pulse sequence generation module, a synchronous trigger module and a PDMI module;
the partial discharge pulse sequence generation module and the synchronous trigger module are both connected with the PDMI module;
the partial discharge spectrum database is used for generating different discharge signals through the PRPD spectrum database and outputting the different discharge signals to the input module; the PRPD map data is discharge map integration generated by partial discharge electrification detection, digital simulation and simulation experiments;
the input module is used for inputting the power supply and the characteristic information of each pulse of the partial discharge pulse sequence to be simulated to the partial discharge pulse sequence generation module;
the partial discharge pulse sequence generation module outputs an ignition signal and a micro-motor action signal for controlling a Marx generator set according to the characteristic information, and outputs a pulse sequence matched with the partial discharge pulse sequence to be simulated to the PDMI module;
the synchronous trigger module is used for outputting a sine synchronous signal to the PDMI module.
The application provides a partial discharge pulse sequence simulation device based on marx generator, can input the partial discharge pulse signal that will simulate through PRPD map spectrum database, and when this signal output was to synchronous trigger module, through an isolation transformer coupling commercial power, sinusoidal synchronizing signal is formed after low pass filtering to the signal of coupling, and this sinusoidal synchronizing signal produces a square wave signal after comparing with a direct current voltage, and the rising edge of this square wave is the trigger of discharging every cycle output of map promptly. By changing the DC reference voltage, the phase difference between the rising edge zero crossing point of the trigger signal and the synchronous signal can be adjusted from 0 degree to 90 degrees, and the analog high-voltage signal comes from the amplification of the synchronous signal. The circuit of the Marx generator group of the partial discharge pulse sequence generation module is controlled by the embedded controller, the input signal is triggered to be connected with the circuit, and the micro motor is controlled to control the last gap of the Marx generator so as to achieve the purpose of controlling the pulse amplitude. And reading a PRPD map sequence from a database, dividing the sequence into pulse segments according to the power frequency period, and outputting the pulse segments as a reference source to control the trigger circuit. The partial discharge pulse signal is simulated so as to realize classification and identification of different partial discharge types, eliminate interference and inhibit noise, and the partial discharge pulse sequence obtained by sampling is subjected to statistics or time domain analysis by a digital signal processing method, so that simulation of partial discharge is realized. The method solves the technical problems that the programmable partial discharge calibrator in the prior art expands a plurality of functions, such as the performance defined on standards of pulse sequence response, pulse resolution and the like, but all the processes are only used for calibrating and evaluating the measured charge, and the evaluation of the performance advanced calibrator is still blank.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application;
fig. 2 is a circuit diagram of a marx generator of a partial discharge pulse sequence simulation apparatus based on the marx generator provided in the present application;
fig. 3 is a structural diagram of a partial discharge pulse sequence generation module of a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application;
fig. 4 is a schematic diagram of a pulse sequence generated by a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application;
reference numerals: an input module 10; a partial discharge pulse sequence generation module 20; a synchronization trigger module 30; the PDMI module 40.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The application provides a partial discharge pulse sequence simulation device based on a Marx generator, which solves the technical problems that a programmable partial discharge calibrator in the prior art expands a plurality of functions, such as performance defined on standards of pulse sequence response, pulse resolution and the like, but all the processes are only aimed at calibration and evaluation of measured apparent charges, and evaluation of an advanced performance instrument is still blank.
Referring to fig. 1-4, fig. 1 is a schematic structural diagram of a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application; fig. 2 is a circuit diagram of a marx generator of a partial discharge pulse sequence simulation apparatus based on the marx generator provided in the present application; fig. 3 is a structural diagram of a partial discharge pulse sequence generation module of a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application; fig. 4 is a schematic diagram of a pulse sequence generated by a partial discharge pulse sequence simulation apparatus based on a marx generator according to the present application.
The embodiment of the application provides a partial discharge pulse sequence simulation device based on a Marx generator, including:
the device comprises an input module 10, a partial discharge pulse sequence generation module 20, a synchronous trigger module 30 and a PDMI module 40;
the partial discharge pulse sequence generation module 20 and the synchronous trigger module 30 are both connected with the PDMI module 40;
the partial discharge spectrum database is used for generating different discharge signals through the PRPD spectrum database and outputting the different discharge signals to the input module 10; PRPD map data is discharge map integration generated by partial discharge electrification detection, digital simulation and simulation experiments;
the input module 10 is configured to input characteristic information of each pulse of the power supply and the partial discharge pulse sequence to be simulated to the partial discharge pulse sequence generation module 20;
the partial discharge pulse sequence generation module 20 outputs an ignition signal and a micro-motor action signal for controlling the marx generator set according to the characteristic information, and outputs a pulse sequence matched with the partial discharge pulse sequence to be simulated to the PDMI module 40;
the synchronization triggering module 30 is used for outputting a sinusoidal synchronization signal to the PDMI module 40.
It should be noted that, as shown in fig. 1 to 4, the partial discharge spectrum database is used as a reference source of a simulation output spectrum of the partial discharge sequence generator, and discharge spectrum data can be obtained through partial discharge electrification detection, digital simulation based on a digital model, and simulation test based on a typical defect. The input module 10 is configured to input characteristic information of each pulse in the partial discharge pulse sequence to be simulated and supported by the power supply, including an amplitude, a polarity, a pulse phase angle or a pulse generation time of each pulse, a time-frequency parameter of each pulse, and the like. The partial discharge pulse sequence generation module 20 is composed of a control unit, a marx generator group and a synchronous trigger output circuit; after receiving the pulse information of the input module 10, the control unit outputs an ignition signal and a micro-motor action signal for controlling the marx generator set so as to output a pulse sequence matched with the input pulse information. The synchronous trigger module 30 is coupled to the mains supply through the isolation transformer, the coupled signal passes through the low-pass filter to form a sinusoidal synchronous signal, the sinusoidal synchronous signal is compared with a direct-current voltage in the comparator to generate a square-wave signal, and the rising edge of the square-wave signal is used as a synchronous signal, namely, the trigger output by the discharge map in each period. The PDMI module 40 is configured to receive the partial discharge pulse sequence and the synchronous trigger signal, and perform interference identification, partial discharge classification, and identification after acquiring data.
The beneficial effect of this application does:
1. a miniaturized device for integrally checking a partial discharge detector system is provided.
2. The method can truly simulate various types of partial discharge pulse sequences and provide the partial discharge pulse sequences for the verification of a partial discharge detector.
3. The method has the advantages of simple and easy operation, low dependence on the environment of external test equipment and strong operability by utilizing the map in the local discharge map database to reproduce the discharge sequence.
Further, the partial discharge map simulation module comprises a graphical interface for receiving information input by a user.
It should be noted that the partial discharge map simulation module is provided with a graphical interface, and is configured to receive information of the partial discharge signal to be simulated, which is input by a user.
Further, the characteristic information includes amplitude, polarity, pulse phase angle or pulse generation time of each pulse, and time-frequency parameters of the pulse.
The partial discharge map simulation module is used for inputting a power supply to support characteristic information of each pulse in a partial discharge pulse sequence to be simulated, wherein the characteristic information comprises amplitude, polarity, pulse phase angle, pulse generation time and the like of each pulse, and can also be information input by a user.
Further, the partial discharge pulse sequence generating module 20 includes a control unit and a marx generator set, where the control unit is configured to receive the characteristic information and output an ignition signal and a micro-motor action signal to the marx generator set.
It should be noted that the partial discharge pulse sequence generation module 20 may reproduce the partial discharge pulse sequence according to the input partial discharge map. Referring to fig. 2, the 555 timer of the power circuit and the 555 control circuit generates a square wave signal to be inputted into the high-power triode in the multi-harmonic oscillation mode, and the triode changes the current of the primary coil of the transformer, so that a larger voltage is obtained in the secondary coil. The voltage multiplier converts the alternating current signal output by the first part into direct current high voltage, and the alternating current signal is filtered by a cascaded capacitor and a diode. The dc high voltage output from the voltage doubler can generate a pulse signal of hundreds of kV after passing through the marx generator circuit. Each marx generator circuit consists of a resistor, a resistor and a spark gap, and generates a high voltage pulse by charging a plurality of capacitors in parallel and then discharging them in series. First, n parallel capacitors are charged to VC through a resistor and a high voltage dc power supply, causing the voltage across the spark gap to also reach VC, which appears as an open circuit during capacitor charging because the breakdown voltage of the gap is greater than VC. To generate the output pulse, the first spark gap is triggered, the first two capacitors are connected in series, applying a voltage of about 2VC across the second spark gap, triggering the second spark gap, the first three capacitors are connected in series, and the process continues with the final triggering of all of the cascaded spark gaps, generating the desired high voltage pulse signal in the last gap. As shown in fig. 3, multiple sets of marx generators are connected in parallel, with the last spark gap of each marx generator being controlled by a microcomputer. The triggering time of each Marx generator is controlled by an ignition signal given by the embedded controller, and the last spark gap is adjusted after receiving a micro-motor action signal given by the embedded controller through the micro-motor, so that the amplitude of the output pulse is controlled. After the embedded controller reads the information of the input module 10, an ignition signal for controlling the trigger of the Marx generator and a signal for controlling the action of the micro-motor are output, the time delay and the amplitude of the discharge pulse are controlled, and a pulse sequence matched with the input partial discharge pulse sequence is generated.
Further, the synchronization triggering module 30 comprises a low pass filter for forming the coupled signals into a synchronous sinusoidal signal.
It should be noted that the synchronous triggering module 30 includes a low-pass filter for forming the coupled signals into synchronous sinusoidal signals.
Further, the partial discharge pulse sequence generating module 20 further includes an ignition signal generating circuit, and the ignition signal generating circuit is connected to the control unit and the marx generator set and is configured to generate an ignition signal.
It should be noted that the partial discharge pulse sequence generating module 20 further includes an ignition signal generating circuit, and the ignition signal generating circuit is connected to the control unit and the marx generator set and is configured to generate an ignition signal.
Furthermore, the Marx generator group comprises a plurality of Marx generators connected in parallel, and each Marx generator is connected with the micro motor and used for controlling the last spark gap of each Marx generator.
Each of the marx generator circuits is composed of a resistor, and a spark gap, and generates a high voltage pulse by charging a plurality of capacitors in parallel and then discharging them in series. First, n parallel capacitors are charged to VC through a resistor and a high voltage dc power supply, causing the voltage across the spark gap to also reach VC, which appears as an open circuit during capacitor charging because the breakdown voltage of the gap is greater than VC. To generate the output pulse, the first spark gap is triggered, the first two capacitors are connected in series, applying a voltage of about 2VC across the second spark gap, triggering the second spark gap, the first three capacitors are connected in series, and the process continues with the final triggering of all of the cascaded spark gaps, generating the desired high voltage pulse signal in the last gap. As shown in fig. 3, multiple sets of marx generators are connected in parallel, with the last spark gap of each marx generator being controlled by a microcomputer. The triggering time of each Marx generator is controlled by an ignition signal given by the embedded controller, and the last spark gap is adjusted after receiving a micro-motor action signal given by the embedded controller through the micro-motor, so that the amplitude of the output pulse is controlled. After the embedded controller reads the information of the input module 10, an ignition signal for controlling the trigger of the Marx generator and a signal for controlling the action of the micro-motor are output, the time delay and the amplitude of the discharge pulse are controlled, and a pulse sequence matched with the input partial discharge pulse sequence is generated.
Further, the control unit comprises an embedded controller.
It should be noted that the controller is an embedded controller, and is used to control the connected tesla coil circuit, trigger the input signal to turn on the circuit, and control the input voltage to control the pulse amplitude. The program reads PRPD map sequence from the database, the sequence is divided into pulse segments according to the power frequency period, and the segments are output as a reference source to control the trigger circuit. The different types of defects have different statistical properties of pulse time distribution and amplitude distribution, which are due to the generation mechanism of partial discharges. This specificity can be used to classify and identify insulation defects, and discharge maps can be collected in three ways: partial discharge live detection, mathematical model-based digital simulation and typical defect-based simulation experiments. After collection, a partial discharge spectrum database can be constructed, the waveform information of the discharge pulse and the information of the partial discharge test (such as a measuring circuit and instrument, a test strip and applied voltage) can be stored, and the characteristic information (amplitude, phase and the like) of each pulse of the partial discharge pulse sequence can be extracted.
When the system simulates and generates a PRPD map, the output synchronization is generated by a trigger circuit which is mainly used for simulating a high-voltage signal. The method comprises the steps that mains supply is coupled through an isolation transformer, coupled signals form sine synchronous signals after low-pass filtering, the sine synchronous signals are compared with a direct-current voltage to generate square wave signals, and the rising edges of the square waves are triggers output by each period of a discharge map. By changing the direct current reference voltage, the phase difference between the rising edge zero-crossing point of the trigger signal and the synchronous signal can be adjusted from 0 degree to 90 degrees. The analog "high voltage" signal then comes from the amplification of the synchronization signal.
The circuit of the Marx generator group is controlled by an embedded system, an input signal is triggered to be connected with the circuit, and the microcomputer is controlled to control the last gap of the Marx generator, so that the purpose of controlling the pulse amplitude is achieved. The program reads PRPD map sequence from the database, the sequence is divided into pulse segments according to the power frequency period, and the segments are output as a reference source to control the trigger circuit.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. A partial discharge pulse sequence simulation device based on a Marx generator is characterized by comprising:
the device comprises an input module, a partial discharge pulse sequence generation module, a synchronous trigger module and a PDMI module;
the partial discharge pulse sequence generation module and the synchronous trigger module are both connected with the PDMI module;
the partial discharge spectrum database is used for generating different discharge signals through the PRPD spectrum database and outputting the different discharge signals to the input module; the PRPD map data is discharge map integration generated by partial discharge electrification detection, digital simulation and simulation experiments;
the input module is used for inputting the power supply and the characteristic information of each pulse of the partial discharge pulse sequence to be simulated to the partial discharge pulse sequence generation module;
the partial discharge pulse sequence generation module outputs an ignition signal and a micro-motor action signal for controlling a Marx generator set according to the characteristic information, and outputs a pulse sequence matched with the partial discharge pulse sequence to be simulated to the PDMI module;
the synchronous trigger module is used for outputting a sine synchronous signal to the PDMI module;
the Marx generator group comprises a plurality of Marx generators connected in parallel, and each Marx generator is connected with a micro motor and used for controlling the last spark gap of each Marx generator.
2. The Marx generator-based partial discharge pulse sequence simulation device of claim 1, wherein the partial discharge map simulation module comprises a graphical interface for receiving user input information.
3. The Marx generator-based partial discharge pulse sequence simulation device according to claim 1, wherein the characteristic information comprises an amplitude, a polarity, a pulse phase angle or a pulse generation time of each pulse, and a time-frequency parameter of each pulse.
4. The Marx generator-based partial discharge pulse sequence simulation device according to claim 1, wherein the partial discharge pulse sequence generation module comprises a control unit and the Marx generator set, and the control unit is configured to receive the characteristic information and output the ignition signal and the micro-motor action signal to the Marx generator set.
5. The Marx generator-based partial discharge pulse sequence simulation device of claim 1, wherein the synchronous trigger module comprises a low pass filter for forming the coupled signals into synchronous sinusoidal signals.
6. The Marx generator-based partial discharge pulse sequence simulation device according to claim 4, wherein the partial discharge pulse sequence generation module further comprises an ignition signal generation circuit, and the ignition signal generation circuit is connected with the control unit and the Marx generator set and used for generating an ignition signal.
7. The Marx generator-based partial discharge pulse sequence simulation device of claim 4, wherein the control unit comprises an embedded controller.
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