CN211718440U - Oiled paper insulation partial discharge monitoring equipment - Google Patents
Oiled paper insulation partial discharge monitoring equipment Download PDFInfo
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- CN211718440U CN211718440U CN201921897686.3U CN201921897686U CN211718440U CN 211718440 U CN211718440 U CN 211718440U CN 201921897686 U CN201921897686 U CN 201921897686U CN 211718440 U CN211718440 U CN 211718440U
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Abstract
The utility model discloses an insulating partial discharge monitoring facilities of oiled paper, include: the device comprises an analog unit, a signal processing unit, a data transmission unit and an upper computer unit; the simulation unit comprises a power supply simulation module and a simulation partial discharge device; the simulated partial discharge device comprises a constant temperature and humidity box, a first finger pressure type electrode and a second finger pressure type electrode; the first finger-pressure type electrode and the second finger-pressure type electrode are arranged above the oiled paper insulation sample; the power output end of the power supply simulation module is connected with the first finger-pressure type electrode, and the second finger-pressure type electrode is grounded; the signal processing unit comprises a UHF antenna and a processing module, wherein the UHF antenna is used for acquiring a voltage signal generated by partial discharge of the oil paper insulation sample, and the processing module is used for converting the voltage signal into a partial discharge signal; the UHF antenna, the first finger-pressure type electrode and the second finger-pressure type electrode are all arranged in the constant temperature and humidity box, so that the real-time online monitoring of the oil-paper insulation partial discharge under the simulation valve side sleeve composite electric field can be realized, and the characteristic of high sensitivity is achieved.
Description
Technical Field
The utility model relates to a high-tension electricity test technical field especially relates to an oil paper insulation partial discharge monitoring facilities.
Background
The voltage waveform borne by the inner sleeve of the high-end valve hall is formed by superposing a large direct-current bias component and harmonic components with different frequency amplitudes, and when the converter valve has phase conversion failure or internal failure, the oiled paper insulation also needs to bear the action of various operation overvoltage or steep wave electric stress. Due to the reasons of direct current magnetic biasing and the like, local overheating is more prone to occur on a valve side sleeve, under a certain temperature and an electric field, water and gas in the oil paper exist in a bubble form and migrate under the action of oil flow and the electric field, so that a small bridge is formed, partial discharge is initiated, surface flashover is generated, and even insulation breakdown is generated. In recent years, as direct current transmission projects are put into operation successively, the frequency of faults of the converter transformer is increased. GIGRE in a report published in 2010 indicated that internal insulation failure due to surface flashover or dielectric breakdown of converter transformer insulation accounted for 65% of the total failure. The statistics of the failure of the power grid converter in 2006-2015 also shows that the failure frequency reaches 65% due to insulation discharge or local overheating of oil paper. Therefore, an online monitoring device for oil-paper insulation partial discharge under a composite electric field of a simulated valve side sleeve is urgently needed.
Disclosure of Invention
The embodiment of the utility model provides an insulating partial discharge monitoring facilities of oiled paper can realize carrying out real-time on-line monitoring to insulating partial discharge of oiled paper under the compound electric field of simulation valve side sleeve pipe, and has the characteristics that sensitivity is high.
In order to achieve the above object, the embodiment of the utility model provides an oiled paper insulation partial discharge monitoring facilities is provided, include: the device comprises an analog unit, a signal processing unit, a data transmission unit and an upper computer unit;
the simulation unit comprises a power supply simulation module and a simulation partial discharge device; the simulated partial discharge device comprises a constant temperature and humidity box, a first finger pressure type electrode and a second finger pressure type electrode; the first finger-pressure type electrode and the second finger-pressure type electrode are arranged above the oiled paper insulation sample; the power output end of the power supply simulation module is connected with the first finger-pressure type electrode, and the second finger-pressure type electrode is grounded;
the signal processing unit comprises a UHF antenna and a processing module, wherein the UHF antenna is used for acquiring a voltage signal generated by partial discharge of the oiled paper insulation sample, and the processing module is used for converting the voltage signal into a partial discharge signal; the UHF antenna, the first finger-pressure type electrode and the second finger-pressure type electrode are all arranged in the constant temperature and humidity box;
the output end of the UHF antenna is connected with the input end of the processing module, the output end of the processing module is connected with the input end of the data transmission unit, and the output end of the data transmission unit is connected with the input end of the upper computer unit.
As an improvement of the above scheme, the power supply simulation module comprises a direct current voltage source, a pulse voltage source and a voltage coupling module;
the output ends of the direct current voltage source and the pulse voltage source are connected with the input end of the voltage coupling module, and the output end of the voltage coupling module is connected with the power output end of the power supply simulation module.
As an improvement of the above solution, the voltage coupling module has a first input terminal for connecting to the output terminal of the dc voltage source and a second input terminal for connecting to the output terminal of the pulse voltage source;
the voltage coupling module comprises a blocking circuit and a low-pass filter circuit; the second input end is connected with the input end of the blocking circuit, and the first input end is connected with the input end of the low-pass filter circuit; the output ends of the blocking circuit and the low-pass filter circuit are connected with the output end of the voltage coupling module.
As an improvement of the above scheme, the voltage coupling module further comprises an impedance voltage divider and an oscilloscope;
the low-pass filter circuit comprises a first resistor and a first capacitor; the input end of the low-pass filter circuit is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first capacitor is connected with the output end of the low-pass filter circuit, and the second end of the first capacitor is grounded;
the DC blocking circuit comprises a second resistor and a second capacitor; the input end of the blocking circuit is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the output end of the blocking circuit;
the impedance divider comprises a third capacitor and a third resistor; the first end of the third capacitor is connected with the output end of the voltage coupling module, the second end of the third capacitor is connected with the input end of the oscilloscope and the first end of the third resistor, and the second end of the third resistor is grounded.
As an improvement of the above scheme, the analog partial discharge device further comprises a platform; the oiled paper insulation test sample is placed on the platform.
As an improvement of the above scheme, the processing module comprises an amplifying module, a filtering module, a detecting module, a voltage feedback amplifying module and a voltage stabilizing module;
the input of processing module with the input of amplifying module is connected, amplifying module's output with filtering module's input is connected, filtering module's output with detection module's input is connected, detection module's output with voltage feedback amplifying module's input is connected, voltage feedback amplifying module's output with voltage stabilizing module's input is connected, voltage stabilizing module voltage feedback amplifying module's output all with processing module's output is connected.
As an improvement of the above scheme, the UHF antenna and the processing module are connected by a transmission line having a BNC connector at one end and a high frequency RF connector at the other end;
wherein, BNC connects with the UHF antenna is connected, high frequency RF head with processing module is connected.
As an improvement of the above scheme, the data transmission unit is equipped with a microprocessor, a DTU sending module, a radio frequency antenna and a DTU receiving module;
the input end of the data transmission unit is connected with the input end of the microprocessor, the output end of the microprocessor is in communication connection with the input end of the DTU sending module, the output end of the DTU sending module is in communication connection with the input end of the DTU receiving module through a radio frequency antenna, and the output end of the DTU receiving module is connected with the output end of the data transmission unit.
As an improvement of the above scheme, the upper computer unit comprises a data analysis module, a display module, a storage module and a data reading module;
the input end of the upper computer unit is connected with the input end of the data analysis module, and the output end of the data analysis module is connected with the input ends of the display module, the storage module and the data reading module.
As an improvement of the scheme, the UHF antenna is an external antenna formed by combining a butterfly antenna and a planar equiangular spiral.
The utility model discloses an insulating partial discharge monitoring facilities of oiled paper compares in prior art, has following beneficial effect:
the test complex working condition of direct current superposition pulse voltage under different moderate and temperature environments is simulated by setting the output voltage of the power supply simulation module and setting the temperature and humidity parameters of the constant temperature and humidity box; furthermore, by arranging a first finger-pressure type electrode, the output voltage is adopted to perform partial discharge simulation on the oiled paper insulation sample; further, when the oiled paper insulation sample generates partial discharge, acquiring a voltage signal generated by the oiled paper insulation sample under the direct current superimposed pulse voltage by arranging a UHF antenna, and converting the voltage signal into a partial discharge signal by arranging a processing module of a signal processing unit; furthermore, the signal processing unit transmits the partial discharge signal to the upper computer unit through the data transmission unit, so that the upper computer unit analyzes the partial discharge signal, the partial discharge characteristic of the oiled paper insulation sample can be monitored in real time on line under the simulation of the composite electric field of the valve side sleeve, the dynamic defect monitoring of the oiled paper insulation high sensitivity can be realized, the accurate analysis of the characteristic of the oiled paper insulation partial discharge under the simulation of the composite electric field of the valve side sleeve can be realized, a reliable device is provided for researching the main insulation full-life cycle management of the valve side sleeve, and the device has the characteristics of high sensitivity and high accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an oiled paper insulation partial discharge monitoring device in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a power supply simulation module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal processing unit in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a data transmission unit in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of the upper computer unit in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, it is the embodiment of the utility model provides an oil paper insulation partial discharge monitoring facilities's structural schematic diagram, oil paper insulation partial discharge monitoring facilities includes: the device comprises an analog unit 1, a signal processing unit 2, a data transmission unit 3 and an upper computer unit 4;
the simulation unit 1 comprises a power supply simulation module 11 and a simulation partial discharge device 12; the simulated partial discharge device 12 comprises a constant temperature and humidity box 121, a first finger pressure type electrode 122 and a second finger pressure type electrode 123; the first finger-pressure type electrode 122 and the second finger-pressure type electrode 123 are arranged above the oiled paper insulation sample 5; the power output end of the power supply simulation module 11 is connected with the first finger-pressure type electrode 122, and the second finger-pressure type electrode 123 is grounded;
the signal processing unit 2 comprises a UHF antenna 21 for acquiring a voltage signal generated by partial discharge of the oiled paper insulation sample and a processing module 22 for converting the voltage signal into a partial discharge signal; the UHF antenna 21, the first finger-pressure type electrode 122 and the second finger-pressure type electrode 123 are all arranged inside the constant temperature and humidity box 121;
the output end of the UHF antenna 21 is connected with the input end of the processing module 22, the output end of the processing module 22 is connected with the input end of the data transmission unit 3, and the output end of the data transmission unit 3 is connected with the input end of the upper computer unit 4.
It should be noted that the simulation unit 1 is used for simulating complex test conditions of direct-current superimposed pulse voltages in different moderate and temperature environments; the power supply simulation module 11 is configured to simulate a direct current superimposed pulse voltage to output a voltage; the simulation partial discharge device 12 is used for simulating different moderate and temperature environments, and the output voltage is used for performing partial discharge simulation on the oiled paper insulation sample 5. The signal processing unit 2 is used for collecting a voltage signal generated by the oil paper insulation sample 5 under the direct current superimposed pulse voltage, and further converting the voltage signal into a partial discharge signal. The data transmission unit 3 is used for transmitting the partial discharge signal. The upper computer unit 4 is used for analyzing the characteristics of the partial discharge of the oiled paper insulation sample 5 according to the partial discharge signal.
Preferably, referring to fig. 1, the power supply simulation module 11 includes a dc voltage source 111, a pulse voltage source 112, and a voltage coupling module 113;
the output ends of the dc voltage source 111 and the pulse voltage source 112 are connected to the input end of the voltage coupling module 113, and the output end of the voltage coupling module 113 is connected to the power output end of the power supply simulation module 11.
In any of the above embodiments, preferably, the dc voltage source 111 is configured to output a dc voltage. The dc voltage source 111 is composed of a positive polarity electrostatic spinning high voltage source and a negative polarity electrostatic spinning high voltage source. Illustratively, the direct current voltage source 111 is composed of a positive polarity and a negative polarity east electrostatic spinning high voltage source respectively, the model thereof is DW-P503-1ACDF, the interior adopts a modular circuit design, the output voltage stabilizing precision is high, the output voltage is continuously adjustable, and the high-precision output voltage and current digital display is provided.
In any of the above embodiments, preferably, the pulse voltage source 112 is configured to output a pulse voltage. The pulse voltage source 112 is composed of a direct current power supply, a high-power insulated gate bipolar thyristor, a high-voltage pulse generator and a signal generator. Illustratively, the pulse voltage source comprises a direct current power supply, a high-power Insulated Gate Bipolar Thyristor (IGBT), a high-voltage pulse generator and a signal generator; the type of the direct current power supply is Maistecke DP305, the output voltage range is 0-30V, the output current range is 0-5A, the voltage accuracy is less than 0.05% +1mV, and the current accuracy is less than 0.05% +1 mA; the model of the high-voltage pulse generator is a DENSO099700-2540 high-voltage packet; the signal generator is model number ulide UTG9005C-II, square wave frequency range: 2/5MHz, output amplitude range: 2mVpp-20 Vpp; the model of the IGBT is TGL40N120 FD.
Preferably, the voltage coupling module 113 has a first input terminal for connecting to the output terminal of the dc voltage source 111 and a second input terminal for connecting to the output terminal of the pulse voltage source 112;
the voltage coupling module 113 comprises a dc blocking circuit 114 and a low pass filter circuit 115; the second input end is connected to the input end of the dc blocking circuit 114, and the first input end is connected to the input end of the low-pass filter circuit 115; the output ends of the dc blocking circuit 114 and the low pass filter circuit 115 are both connected to the output end V1 of the voltage coupling module 113.
It should be noted that the voltage coupling module 113 is configured to couple output voltages of the dc voltage source 111 and the pulse voltage source 112 to implement an analog dc superimposed pulse electric field, and thus, the voltage coupling module 113 may be a chip, a device, or a processor with a voltage coupling function, such as a voltage coupler.
Preferably, referring to fig. 2, which is a schematic circuit diagram of the power supply simulation module in the embodiment of the present invention, the voltage coupling module 113 further includes an impedance divider T and an oscilloscope 116;
the low pass filter circuit 115 comprises a first resistor R1 and a first capacitor C1; an input end of the low-pass filter circuit 115 is connected to a first end of the first resistor R1 and a first end of the first capacitor C1, a second end of the first capacitor C1 is connected to an output end of the low-pass filter circuit 115, and a second end of the first capacitor C1 is grounded;
the dc blocking circuit 114 comprises a second resistor R2 and a second capacitor C2; the input end of the dc blocking circuit 114 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the output end of the dc blocking circuit 114;
the impedance divider T comprises a third capacitor C3 and a third resistor R3; a first end of the third capacitor C3 is connected to the output end V1 of the voltage coupling module 113, a second end of the third capacitor C3 is connected to the input end of the oscilloscope 116 and the first end of the third resistor R3, and a second end of the third resistor R3 is grounded.
Note that the low-pass filter circuit 115 is configured to low-pass filter the dc voltage signal, and thus the low-pass filter circuit 115 may be a circuit, a chip, or a device having a low-pass filter function. The dc blocking circuit 114 is used to block the dc power in the pulse voltage, and thus the dc blocking circuit 114 may be a circuit, a chip or a device having a dc blocking function. The impedance voltage divider T may be a circuit, a chip or a device having an impedance voltage dividing function, and is not limited to the structure formed by the third capacitor C3 and the third resistor R3 in this embodiment. Specifically, the second capacitor C2 is a high-voltage film capacitor, and the second resistor R2 is a high-voltage resistor. The first capacitor C1 is a high-voltage non-inductive capacitor, and the first resistor R1 is a high-voltage non-inductive resistor. For example, the first capacitor C1 and the second capacitor C2 are polypropylene high-voltage non-inductive absorption film capacitors, and the first resistor R1 and the second resistor R2 are high-frequency non-inductive discharge resistors of clovershrub high-voltage glass glaze. The polypropylene high-voltage noninductive absorption film capacitor is characterized by being an EACO-SDD (intrinsic discharge-super-capacitor), the capacity value of the capacitor is 0.2 mu F, the withstand voltage level of the capacitor is 50kV, the Dahongpao high-voltage glass glaze high-frequency noninductive discharge resistor is an RI80 resistor, and the resistance value of the resistor is 10M omega.
In any of the above embodiments, the simulated partial discharge device 12 may be composed of a constant temperature and humidity chamber of aigrette size LGD80LA and two finger-pressure type electrodes, wherein the constant temperature and humidity chamber adopts MCU program control temperature, the temperature is raised to about 4 ℃/min, the temperature range is-20-150 ℃, the humidity range is 20% -98% r.h., the temperature is lowered to about 1 ℃/min, and the precision is ± 0.5 ℃ ± 2.5% r.h. In addition, the output end of the voltage coupling module 113 is connected to the first finger-pressure type electrode 122, the second finger-pressure type electrode 123 is connected to the ground through a cable, and a distance between the first finger-pressure type electrode 122 and the second finger-pressure type electrode 123 is d.
Preferably, referring to fig. 1, the analog partial discharge device 12 further includes a platform 124; the oiled paper insulation sample 5 is placed on the platform 124. In this embodiment, the oiled paper insulation sample 5 is placed on the platform 124, and the first finger-pressure type electrode 122 and the second finger-pressure type electrode 123 are placed on the oiled paper insulation sample 5. Furthermore, the first finger-pressure type electrode 122 is connected to the power supply simulation module 11, and the partial discharge along the surface of the oiled paper insulation sample is simulated by superimposing a pulse electric field on the direct current of the valve side socket according to the output voltage.
Preferably, the UHF antenna 21 is an external antenna combining a butterfly antenna and a planar equiangular spiral.
Preferably, the UHF antenna 21 and the processing module 22 are connected by a transmission line having a BNC connector at one end and a high frequency RF connector at the other end;
wherein, the BNC connector is connected with the UHF antenna 21, and the high-frequency RF connector is connected with the processing module 22.
In this embodiment, the UHF antenna 21 is connected to and placed inside the constant temperature and humidity chamber 121, and the UHF antenna 21 is used for collecting a voltage signal generated by the oiled paper insulation sample under the direct current superimposed pulse voltage. Illustratively, the UHF antenna adopts a PCB type antenna which is formed by compounding a butterfly antenna and a planar equiangular spiral, an epoxy resin pouring layer with the thickness of 0.8 +/-0.2 mm is attached to the surface of the UHF antenna, a hollow reflection cavity is arranged in an antenna shell, and a BNC head is connected through a high-frequency coaxial line, so that corona crosstalk can be avoided.
Preferably, referring to fig. 3, the schematic diagram of the signal processing unit in the embodiment of the present invention is shown, and the processing module 22 includes an amplifying module 221, a filtering module 222, a detecting module 223, a voltage feedback amplifying module 224, and a voltage stabilizing module 225;
the input end of the processing module 22 is connected to the input end of the amplifying module 221, the output end of the amplifying module 221 is connected to the input end of the filtering module 222, the output end of the filtering module 222 is connected to the input end of the detecting module 223, the output end of the detecting module 223 is connected to the input end of the voltage feedback amplifying module 224, the output end of the voltage feedback amplifying module 224 is connected to the input end of the voltage stabilizing module 225, and the output ends of the voltage stabilizing module 225 and the voltage feedback amplifying module 224 are both connected to the output end of the processing module 22.
It should be noted that the amplifying module 221 is configured to amplify the voltage signal collected by the UHF antenna, and the amplifying module 221 may be a chip, a circuit or an instrument device having a signal amplifying function, for example, the amplifying module 221 may be a secondary amplifying circuit implemented by connecting two chips with model number ADL5545 in series. The filtering module 222 is used to filter interference, such as external signals like power frequency interference, the filtering module 222 may be a chip, a circuit or an instrument with a signal filtering function, for example, the filtering module 222 may be a three-order butterworth high-pass filter, and the cutoff frequency is set to be above 500 MHz. The detection module 223 is used for detecting the interference such as corona, so that the interference such as corona can be effectively avoided, the detection module 223 can be a chip, a circuit or an instrument with a signal detection function, for example, the detection module 223 can be formed by SMS7630 high-frequency diode series RC charging and discharging circuit. The voltage feedback amplifying module 224 implements further signal amplification, and the voltage feedback amplifying module 224 may be a chip, a circuit or an instrument device having a voltage signal feedback amplifying function. The voltage stabilizing module 225 is used for keeping the output voltage basically unchanged when the input voltage fluctuates or the load changes, so as to prevent the voltage fluctuation from causing the abnormality or the fault of the electric appliance, and the voltage stabilizing module 225 may be a chip, a circuit or an instrument device with a voltage stabilizing function. For example, the voltage feedback amplification module 224 and the voltage stabilization module 225 may employ two voltage operational amplifiers in an AD8056 chip to achieve amplification and voltage following.
The signal processing unit 2 therefore operates on the principle: when the oil paper insulation sample 5 generates partial discharge, pulse current with duration only ns level can be generated, the excited electromagnetic wave can penetrate through the epoxy material pouring layer, and is coupled into a voltage signal through the external UHF antenna 21, and meanwhile, the voltage signal is sent to the processing module 22 of the signal processing unit 2, and the accurate partial discharge signal is captured through amplification, filtration and other processing.
Preferably, referring to fig. 4, it is a schematic structural diagram of a data transmission unit in an embodiment of the present invention, where the data transmission unit 3 is equipped with a microprocessor 31, a DTU sending module 32, a radio frequency antenna 33, and a DTU receiving module 34;
the input of data transmission unit 3 with microprocessor 31's input is connected, microprocessor 31's output with DTU send module 32's input communication connection, DTU send module 32's output pass through radio frequency antenna 33 with DTU receiving module 34's input communication connection, DTU receiving module 34's output with data transmission unit 3's output is connected.
The microprocessor 31 is configured to convert the analog of the partial discharge signal from the signal processing unit into a digital signal, and send the digital signal of the partial discharge signal to the DTU sending module 32. Illustratively, the microprocessor 31 may be a high-performance STM32 series ARM chip, and converts an analog signal of the received partial discharge signal into a digital signal by using an a/D conversion module of the high-performance ARM chip, and simultaneously, realizes a communication connection with the DTU sending module 32 through an RS232 serial port communication. The DTU transmission module 32 may be a device having a DTU transmission function, and the DTU reception module 34 may be a device having a DTU reception function. Furthermore, the DTU transmitting module 32 is connected to the radio frequency antenna 33, and transmits the digital signal of the partial discharge signal to the DTU receiving module 34 through the GPRS. Therefore, the upper computer unit 4 receives the data transmitted by the DTU receiving module 34 by using an RS232 serial port.
Preferably, referring to fig. 5, the upper computer unit in the embodiment of the present invention is a schematic structural diagram, where the upper computer unit 4 includes a data analysis module 41, a display module 42, a storage module 43, and a data reading module 44;
the input end of the upper computer unit 4 is connected with the input end of the data analysis module 41, and the output end of the data analysis module 41 is connected with the input ends of the display module 42, the storage module 43 and the data reading module 44.
The data analysis module 41 is configured to analyze the Partial Discharge signal, and further perform a Phase Resolved Partial Discharge (PRPD) and a pulse Sequence Phase spectrogram (PRPS) to obtain a characteristic of the Partial Discharge of the oiled paper insulation sample 5. The data analysis module 41 measures the amplitude of the received partial discharge signal, calculates the number of pulses of the partial discharge signal, and determines the intensity of the partial discharge according to the measured magnitude of the partial discharge pulse signal and the number of pulses, so as to trace the partial discharge phase spectrogram and the pulse sequence phase spectrogram. Thus, the data analysis module 41 may be a processor, and a calculation program executed by the processor for analyzing the characteristic of the partial discharge of the oiled paper insulation sample is stored. The display module 42 may be an instrument device with a display function, and in this embodiment, the display module is configured to display the characteristic of the partial discharge of the oiled paper insulation sample obtained by the data analysis module on the UI. The storage module 43 is used for storing the characteristic of the partial discharge of the oiled paper insulation sample, and may be a processor or a device with a data storage function. The data reading module 44 is used for reading characteristic data of partial discharge of the oiled paper insulation sample, and may be a processor or a device with a data reading function.
The utility model discloses an insulating partial discharge monitoring facilities of oiled paper compares in prior art, has following beneficial effect:
the test complex working condition of direct current superposition pulse voltage under different moderate and temperature environments is simulated by setting the output voltage of the power supply simulation module and setting the temperature and humidity parameters of the constant temperature and humidity box; furthermore, by arranging a first finger-pressure type electrode, the output voltage is adopted to perform partial discharge simulation on the oiled paper insulation sample; further, when the oiled paper insulation sample generates partial discharge, acquiring a voltage signal generated by the oiled paper insulation sample under the direct current superimposed pulse voltage by arranging a UHF antenna, and converting the voltage signal into a partial discharge signal by arranging a processing module of a signal processing unit; furthermore, the signal processing unit transmits the partial discharge signal to the upper computer unit through the data transmission unit, so that the upper computer unit analyzes the partial discharge signal, the partial discharge characteristic of the oiled paper insulation sample can be monitored in real time on line under the simulation of the composite electric field of the valve side sleeve, the dynamic defect monitoring of the oiled paper insulation high sensitivity can be realized, the accurate analysis of the characteristic of the oiled paper insulation partial discharge under the simulation of the composite electric field of the valve side sleeve can be realized, a reliable device is provided for researching the main insulation full-life cycle management of the valve side sleeve, and the device has the characteristics of high sensitivity and high accuracy.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. The utility model provides an oil paper insulation partial discharge monitoring facilities which characterized in that includes: the device comprises an analog unit, a signal processing unit, a data transmission unit and an upper computer unit;
the simulation unit comprises a power supply simulation module and a simulation partial discharge device; the simulated partial discharge device comprises a constant temperature and humidity box, a first finger pressure type electrode and a second finger pressure type electrode; the first finger-pressure type electrode and the second finger-pressure type electrode are arranged above the oiled paper insulation sample; the power output end of the power supply simulation module is connected with the first finger-pressure type electrode, and the second finger-pressure type electrode is grounded;
the signal processing unit comprises a UHF antenna and a processing module, wherein the UHF antenna is used for acquiring a voltage signal generated by partial discharge of the oiled paper insulation sample, and the processing module is used for converting the voltage signal into a partial discharge signal; the UHF antenna, the first finger-pressure type electrode and the second finger-pressure type electrode are all arranged in the constant temperature and humidity box;
the output end of the UHF antenna is connected with the input end of the processing module, the output end of the processing module is connected with the input end of the data transmission unit, and the output end of the data transmission unit is connected with the input end of the upper computer unit.
2. The apparatus for monitoring partial discharge in paper oil insulation according to claim 1, wherein the power supply simulation module comprises a direct current voltage source, a pulse voltage source and a voltage coupling module;
the output ends of the direct current voltage source and the pulse voltage source are connected with the input end of the voltage coupling module, and the output end of the voltage coupling module is connected with the power output end of the power supply simulation module.
3. The apparatus of claim 2, wherein the voltage coupling module has a first input for connection to an output of the dc voltage source and a second input for connection to an output of the pulsed voltage source;
the voltage coupling module comprises a blocking circuit and a low-pass filter circuit; the second input end is connected with the input end of the blocking circuit, and the first input end is connected with the input end of the low-pass filter circuit; the output ends of the blocking circuit and the low-pass filter circuit are connected with the output end of the voltage coupling module.
4. The oilpaper insulation partial discharge monitoring device of claim 3, wherein the voltage coupling module further comprises an impedance divider and an oscilloscope;
the low-pass filter circuit comprises a first resistor and a first capacitor; the input end of the low-pass filter circuit is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first capacitor is connected with the output end of the low-pass filter circuit, and the second end of the first capacitor is grounded;
the DC blocking circuit comprises a second resistor and a second capacitor; the input end of the blocking circuit is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the output end of the blocking circuit;
the impedance divider comprises a third capacitor and a third resistor; the first end of the third capacitor is connected with the output end of the voltage coupling module, the second end of the third capacitor is connected with the input end of the oscilloscope and the first end of the third resistor, and the second end of the third resistor is grounded.
5. The oilpaper insulation partial discharge monitoring apparatus of claim 1, wherein the simulated partial discharge device further comprises a platform; the oiled paper insulation test sample is placed on the platform.
6. The oilpaper insulation partial discharge monitoring equipment according to claim 1, wherein the processing module comprises an amplifying module, a filtering module, a wave detection module, a voltage feedback amplifying module and a voltage stabilizing module;
the input of processing module with the input of amplifying module is connected, amplifying module's output with filtering module's input is connected, filtering module's output with detection module's input is connected, detection module's output with voltage feedback amplifying module's input is connected, voltage feedback amplifying module's output with voltage stabilizing module's input is connected, voltage stabilizing module voltage feedback amplifying module's output all with processing module's output is connected.
7. The oilpaper insulation partial discharge monitoring device of claim 1, wherein the UHF antenna and the processing module are connected by a transmission line with a BNC connector at one end and a high frequency RF connector at the other end;
wherein, BNC connects with the UHF antenna is connected, high frequency RF head with processing module is connected.
8. The oilpaper insulation partial discharge monitoring device of claim 1, wherein the data transmission unit is provided with a microprocessor, a DTU (data transfer unit) sending module, a radio frequency antenna and a DTU receiving module;
the input end of the data transmission unit is connected with the input end of the microprocessor, the output end of the microprocessor is in communication connection with the input end of the DTU sending module, the output end of the DTU sending module is in communication connection with the input end of the DTU receiving module through a radio frequency antenna, and the output end of the DTU receiving module is connected with the output end of the data transmission unit.
9. The oilpaper insulation partial discharge monitoring device of claim 1, wherein the upper computer unit comprises a data analysis module, a display module, a storage module and a data reading module;
the input end of the upper computer unit is connected with the input end of the data analysis module, and the output end of the data analysis module is connected with the input ends of the display module, the storage module and the data reading module.
10. The apparatus for monitoring partial discharge in oilpaper insulation according to claim 1, wherein the UHF antenna is an external antenna in which a bowtie antenna and a planar equiangular spiral are combined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921897686.3U CN211718440U (en) | 2019-11-05 | 2019-11-05 | Oiled paper insulation partial discharge monitoring equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921897686.3U CN211718440U (en) | 2019-11-05 | 2019-11-05 | Oiled paper insulation partial discharge monitoring equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514741A (en) * | 2021-07-21 | 2021-10-19 | 北京石油化工学院 | Experimental device for liquid electrode partial discharge simulation under direct current excitation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514741A (en) * | 2021-07-21 | 2021-10-19 | 北京石油化工学院 | Experimental device for liquid electrode partial discharge simulation under direct current excitation |
| CN113514741B (en) * | 2021-07-21 | 2023-09-15 | 北京石油化工学院 | Experimental device for liquid electrode partial discharge simulation under direct current excitation |
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