CN108680836A - Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system - Google Patents
Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system Download PDFInfo
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- CN108680836A CN108680836A CN201810386692.6A CN201810386692A CN108680836A CN 108680836 A CN108680836 A CN 108680836A CN 201810386692 A CN201810386692 A CN 201810386692A CN 108680836 A CN108680836 A CN 108680836A
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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
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- 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
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention discloses a kind of multiple physical field coupling paper oil insulation partial discharge detecting system based on high-frequency method, is mainly made of four multiple physical field coupling paper oil insulation shelf depreciation module, high-frequency signal analysis module, signal transmission module, host display module parts；The multiple physical field coupling paper oil insulation shelf depreciation module includes DC power supply, Harmonic Current, voltage regulation unit and simulation shelf depreciation device；The DC power supply connects the input terminal of the voltage regulation unit with the output end of the Harmonic Current, and the output end of the voltage regulation unit connects the input terminal of the simulation shelf depreciation device；The output end of the simulation shelf depreciation device connects the input terminal of the high-frequency signal analysis module；The output end of the signal transmission module connects the input terminal of the host display module.The present invention can realize accurate signal capture, by the way that collection result by being wirelessly transmitted to data analysis unit, is ensured that safe operation is reliable.
Description
Technical field
The invention belongs to paper oil insulation Partial Discharge Detection fields, and in particular to a kind of multiple physical field coupling based on high-frequency method
Paper oil insulation partial discharge detecting system is closed, for the part of the converter transformer valve-side sleeve paper oil insulation under multiple physical field
Discharge examination.
Background technology
The destruction of shelf depreciation is mainly the chemistry generated in heat, the shock of charged particles, electric discharge evolution
Active fragment and shock wave and radiation effects.Since the effect of above-mentioned factor makes damaged surfaces, to change material structure.By
Different destructions can be caused by forming different shelf depreciations in material, and the destruction of shelf depreciation is mainly ion bombardment,
And polyethylene then mainly is caused to crack.The factors such as the destruction of shelf depreciation and electric field strength, electric voltage frequency are also related,
Discharge time and discharge frequency are directly proportional, high-frequency, in addition to leading to dielectric heat, while can shorten the voltage ageing service life of insulation.
The electric field strength that insulation is born is increased, so that discharge time is increased, can equally ager process be made to accelerate.Shelf depreciation can reduce absolutely
Edge performance can result in insulation breakdown sometimes under the long-term serious effect of shelf depreciation.
Develop recently as high voltage direct current transmission project (High Voltage Direct Current, HVDC), direct current
Voltage, pulse voltage and the lower paper oil insulation partial discharge phenomenon analysis of harmonic voltage effect become research hotspot.But at this stage,
Both at home and abroad is still within to the experiment of shelf depreciation under multiple physical field voltage and the research of diagnostic techniques the starting stage.
High frequency partial discharge examination method is the common measurement method for power equipment shelf depreciation defects detection and positioning
One of.It is usually 3-30MHz that it, which detects frequency range, has many advantages, such as strong antijamming capability, and detection sensitivity is high, can be used extensive
Detection, positioning and fault type recognition applied to high-tension electricity apparatus local discharge class defect.
Zigbee serial port modules are the 2.4GZigbee wireless serial transparent transmissions based on Zigbee2007/PRO protocol stacks
Communication module.2.4G rf chip CC2530 and high-power low noise radio-frequency front-end of the module based on TI high-performance low-power-consumptions
Chip CC2591 realizes that easily use, all-transparent, high stable, super low-power consumption, overlength distance, ultra-large Zigbee is wirelessly passed
Feel the networking of network.
Invention content
It is an object of the invention to overcome deficiency in the prior art, a kind of multiple physical field coupling based on high-frequency method is provided
Paper oil insulation partial discharge detecting system, using the Partial Discharge Detecting Technology of High Frequency Current Sensor (HFCT), and in more objects
Paper oil insulation shelf depreciation defect is diagnosed and is identified reason off field.
The present invention be by combining High Frequency Current Sensor and DC stacked harmonic voltage device, can be to the oilpaper of operation
Insulated local discharge carries out highly sensitive detection, and carries out signal acquisition and signal analysis, and result is then sent to host,
And then the partial discharge detecting system of paper oil insulation deterioration is described in terms of shelf depreciation
The technical issues of present invention is proposed by solution, the technical solution adopted is that：Multiple physical field coupling based on high-frequency method
Paper oil insulation partial discharge detecting system is closed, mainly by multiple physical field coupling paper oil insulation shelf depreciation module, high-frequency signal point
Analyse four module, signal transmission module, host display module part compositions；
The multiple physical field coupling paper oil insulation shelf depreciation module includes DC power supply, Harmonic Current, voltage adjusting list
Member and simulation shelf depreciation device；
The DC power supply connects the input terminal of the voltage regulation unit, the electricity with the output end of the Harmonic Current
The output end that pressure adjusts unit connects the input terminal for simulating shelf depreciation device；
Two for simulating shelf depreciation device and being preheated platform by a constant temperature and being set on the constant temperature preheating platform
A finger pressure type electrode is constituted：One of finger pressure type electrode is connected with the output end of the voltage regulation unit, another finger pressure
Type electrode is connected with the earth；
The output end of the simulation shelf depreciation device connects the input terminal of the high-frequency signal analysis module；
The high-frequency signal analysis module is obtaining high frequency partial discharge signal caused by paper oil insulation, including successively
High Frequency Current Sensor, amplifying circuit, filter circuit and the detecting circuit of concatenation, the detecting circuit output end are connected to signal
The input terminal of transmission module；
The signal transmission module is for acquiring Partial Discharge Data and being wirelessly transferred, using microprocessor chip
(Microprogrammed Control Unit, MCU) is used as primary processor, and by serial communication, carries Zigbee and send
The wireless transmission of the complete paired data of module；
The output end of the Zigbee sending modules connects radio frequency (Radio Frequency, RF) antenna, by wirelessly connecting
It is connected to the serial ports of the Zigbee receiving modules of host；
The output end of the signal transmission module connects the input terminal of the host display module；
The host display module, which is used to obtain from signal transmission module, is transmitted through the data come, and carries out shelf depreciation phase
Spectrogram (Phase Resolved Partial Discharge, PRPD) and pulse train phase spectrogram (Phase Resolved
Pulse Sequence, PRPS) described point, the results are shown in man-machine interface, and data storage and reading can be carried out.
The preferred static spinning high-voltage source of DC power supply.
The Harmonic Current is made of a single-entry single-out variable-frequency power sources and a testing transformer, and the variable-frequency power sources is defeated
Outlet is connected by three-phase power line with the input terminal of the testing transformer.
The High Frequency Current Sensor connects BNC heads by high frequency coaxial line.
The High Frequency Current Sensor uses the externally positioned type antenna of this lubber ring of Kenneth Rogoff.
The voltage regulation unit is made of two high voltage thin film capacitances and two high-tension resistives.
The constant temperature preheats platform embedded micro-processor (MCU) program control temperature and configures independent temperature sensing coil probe.
The host display module is using high-performance ARM chips as microprocessor (MCU).
Advantageous effect
1, the present invention realizes while applying DC voltage and harmonic voltage, being capable of accurate simulation converter transformer valve-side sleeve
Complex working condition, and the switching of positive and negative direct current power supply is quick, ensures experiment safety.The output voltage and frequency of harmonic voltage generator
Rate is adjustable, and assurance function is perfect.
2, invention uses the output power of this lubber ring of Kenneth Rogoff low, and the linearity is good, can more be accurately captured part
Discharge signal can effectively remove part interference signal.
3, host analysis is powerful, has data comparison library and analytical model, can consult store historical data, and energy
Enough self-defining picture numbers and date, from two kinds of spectrogram Cooperative Analysis local discharge characteristics of PRPD and PRPS, and carry out pattern
Identification.
4, the present invention has a variety of graphic parameter setting functions, can carry out visualization decrease of noise functions, given threshold and can adopt
Sample interval and supply frequency etc..
5, the present invention realizes that fully digitalization shows that interface is more intuitive, concise, and human-computer interaction is friendly.
6, compared with existing detection technique and detection device, the present invention being capable of accurate simulation converter transformer valve-side sleeve use
Paper oil insulation generated local discharge signal under actual condition, detection is accurate, is convenient for staff's operation setting and diagnosis,
Advantage is had more using the detecting system based on high-frequency method, can realize accurate signal capture, by the way that collection result is passed through nothing
Line is transmitted to data analysis unit, ensures that safe operation is reliable.
Description of the drawings
Fig. 1 is the voltage regulation unit circuit interconnect pattern of the present invention；
Fig. 2 is the system structure installation drawing and system framework figure of the present invention；
Fig. 3 is the high-frequency information analysis module block diagram of the present invention；
Fig. 4 is High Frequency Current Sensor of the present invention (HFCT) appearance；
Fig. 5 is the host interface of the present invention.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the multiple physical field coupling oil based on high-frequency method further illustrated the present invention
How paper insulation partial discharge detecting system is realized.
The present invention couples the combination of shelf depreciation device by High Frequency Current Sensor and multiple physical field, to paper oil insulation office
Portion's electric discharge is detected, from part of the aspect description paper oil insulation of PRPD and PRPS spectrograms two under multiple physical field coupling
Discharge characteristic studies the dielectric properties of converter transformer valve-side sleeve interior insulation.The purpose of the present invention can pass through following measures
To reach：A kind of multiple physical field coupling paper oil insulation partial discharge detecting system based on high-frequency method is provided, i.e., it is a kind of based on height
Frequency current sensor and multiple physical field coupling shelf depreciation device realize the shelf depreciation dynamic of paper oil insulation and highly sensitive inspection
It surveys.
As shown in Fig. 2, the multiple physical field based on High Frequency Current Sensor couples paper oil insulation partial discharge detecting system, use
The local discharge characteristic research of paper oil insulation under the research change of current complicates operating mode.The present invention mainly couples oilpaper by multiple physical field
Four insulated local discharge module, high-frequency signal analysis module, signal transmission module, host display module parts are constituted：
Wherein, multiple physical field coupling paper oil insulation shelf depreciation module includes DC power supply, Harmonic Current, voltage adjusting list
Member and simulation shelf depreciation device；DC power supply described in the present embodiment by the gentle and quiet Electrospun high voltage power supply in positive polarity east and
One gentle and quiet Electrospun high voltage power supply in negative polarity east is constituted, and model DW-P503-1ACDF, inside is set using modularized circuit
Meter, the output precision of voltage regulation is high, and output voltage is continuously adjustable, and is shown with high-precision output voltage and current digital.
The DC power supply connects the input terminal of the voltage regulation unit, the electricity with the output end of the Harmonic Current
The output end that pressure adjusts unit connects the input terminal for simulating shelf depreciation device.
Harmonic Current described in the present embodiment is by a 10kVA single-phase inputs single-phase output AC single phase variable-frequency power sources and one
Platform testing transformer forms, the model OYHS-9803 of the variable-frequency power sources, and frequency is continuously adjustable in 40-499.9Hz, output
Voltage is continuously adjustable in 0-300V, and waveform is sine wave, distortion rate≤1%.Three prosperous China of testing transformer model Wuhan
Safe electrical 10kVA transformers, rated output voltage AC16kV, nominal input voltage 200V.The variable-frequency power sources output end
It is connected with the input terminal of the testing transformer by three-phase power line.
Voltage regulation unit circuit connects as shown in Figure 1, the voltage regulation unit is a noninductive suction of polypropylene high pressure
Receive thin film capacitor C1With a noninductive discharge resistance R of clovershrub high-pressure glass glaze high frequency1The low-pass filter circuit that builds with
One polypropylene high pressure is noninductive absorbing membrane capacitor C2With a noninductive discharge resistance R of clovershrub high-pressure glass glaze high frequency2Series connection
Made of block isolating circuit form；The model EACO- of polypropylene high pressure described in the present embodiment is noninductive absorbing membrane capacitor
SDD, the model RI80 of the noninductive discharge resistance of the clovershrub high-pressure glass glaze high frequency.
The simulation shelf depreciation device is model HB-HP-6040 Chinese nation's heated at constant temperature platform and is set to institute
The two finger pressure type electrodes stated on heated at constant temperature platform are constituted, and heating platform is heated up using resistance wire fever, may be implemented
It is rapidly heated.Platform built-in MCU program control temperature simultaneously configures independent temperature sensing coil probe, and every difference of panel is less than ± 2 DEG C, it is ensured that sample
Uniform constant temperature is heated, and the number display equipped with actual temperature and set temperature；One of finger-type electrode adjusts single with voltage
The output end of member is connected, another finger-type electrode is connected with the earth.
The output end of the simulation shelf depreciation device connects the input terminal of the high-frequency signal analysis module.
High-frequency signal analysis module is wrapped as shown in figure 3, to obtain high frequency partial discharge signal caused by paper oil insulation
Include High Frequency Current Sensor HFCT, amplifying circuit, filter circuit, the detecting circuit being sequentially connected in series, the amplifying circuit by
The OP275G rate of doing works are amplified；The filter circuit uses Butterworth filter；The detecting circuit uses 1N4007；Signal
The input terminal of transmission module, signal is filtered, after detection, and signal is sent to the signal transmission module；
The High Frequency Current Sensor can avoid alien crosstalk as shown in figure 4, connect BNC heads by high frequency coaxial line.
When shelf depreciation occurs for paper oil insulation, the pulse current that the duration is only ns grades is will produce, high-frequency electrical is passed through
Flow sensor is coupled into voltage signal, while being sent to amplifying circuit, filter circuit, need to be amplified herein circuit into
Then row amplification needs to filter out the outer signals such as interference noise, such as Hz noise, detection is carried out after signal is filtered.
Partial discharge pulse's signal is sent to subsequent cell by signal transmission module by wireless communication mode；Using high property
Energy STM32 series A RM chips are as microprocessor (MCU)；Specific method is converted using the A/D that high-performance ARM chips carry
The previous stage analog signal received is converted to digital signal, while by UART serial communications, being sent out with transmission module by module
It send module to be connected, collected signal is encoded, by being wirelessly transmitted to host.The transmission module uses
ZAuZx_T series Zigbee serial ports transmission modules realize wireless transmission communication by RF antennas.
Host display module is used to analyze Partial Discharge Data and carry out the described point of PRPD and PRPS, and right
The shelf depreciation state of paper oil insulation judges, and the result of analysis is stored and inquired.Made using high-performance ARM chips
For microprocessor (MCU)；Specific method is to utilize STM32 series high-performance ARM chips, will by included A/D conversion modules
The previous stage analog signal received is converted to digital signal, and the amplitude of the docking collection of letters number measures and calculates shelf depreciation
Signal pulse number judges electric power using the size of measured partial discharge pulse's signal value and pulse number as foundation
The power of cable local discharge, carries out the described point of PRPD and PRPS spectrograms with this, unit dB, as shown in Figure 5.
Power supply is powered using outside lithium battery, easy to disassemble to charge.
The multiple physical field based on high-frequency method of the present invention couples paper oil insulation partial discharge detecting system, specifically uses ring
Border and its method are as follows：
1, use environment
Height above sea level：≤1000m
Operating temperature：-20℃-40℃
Working relative humidity：0-90%, no condensation
Without fire, explosion danger, pollution severity chemical attack, high vibration, strong electromagnetic and lightning stroke place are tested and set
It is standby to want good earth
2, application method
(1) cellulose insulation sample making step
1. the cellulose insulation paper produced using Li Co., Ltd in the Southern Tang Dynasty in this example, thickness 0.13mm, by fiber
Plain insulating paper is cut into the square sample of 20mm*50mm, and sample is put into model 401B type heat aging test chambers and is carried out
Dry, temperature setting is 90 DEG C, and drying time is set as 12 hours.
2. carrying out vacuum oil filtering processing using Great Wall 25# transformer oil.
3. by treated, cellulose insulation paper is put into insulating oil, and dry in the vacuum of model DZF-6020/6050
48 hours are stood in dry case, the mass ratio for controlling insulating paper and insulating oil is less than 1：20, environment temperature is set as 40 DEG C, vacuum degree
It is set as 50Pa.
4. taking out immersion oil treated oil-immersed insulating paper carries out subsequent experimental procedure.
(2) Partial Discharge Detection step
1. two finger-type electrodes are placed on heated at constant temperature platform and are fixed relatively, distance is set as between electrode
15mm puts oil-paper sample between the electrodes, and ensures that electrode seal is fitted on sample, and heating platform temperature is set in 40
℃。
2. setting the voltage magnitude of the high-voltage DC power supply as 10kV, the harmonic voltage frequency is set as 250Hz, is incited somebody to action
High Frequency Current Sensor is sleeved on oil-immersed insulating paper, so that oil-immersed insulating paper is located at sensor center, is shown by host setting
Pulse electricity number is 1000, triggering level 1dB.
3. the voltage magnitude that harmonic voltage generator generates is increased, when shelf depreciation occurs for paper oil insulation, high-frequency current
Sensor coupling transfers out the transverse electromagnetic wave signal come from sample, by detecting circuit into obtaining after amplification is filtered
To that can send to effective acquisition pulse signal of ARM, after A/D digital-to-analogue conversions, Zigbee module is reached through UART serial ports, is led to
RF antenna wireless transmissions are crossed to send to host display module；Host also provides man-machine interface and data storage and query function simultaneously,
And PRPD and PRPS spectrograms are exported in real time.
Claims (8)
1. the multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system, which is characterized in that mainly by more objects
Manage four field coupling paper oil insulation shelf depreciation module, high-frequency signal analysis module, signal transmission module, host display module portions
Divide and constitutes；
Multiple physical field coupling paper oil insulation shelf depreciation module include DC power supply, Harmonic Current, voltage regulation unit and
Simulate shelf depreciation device；
The DC power supply connects the input terminal of the voltage regulation unit, the voltage tune with the output end of the Harmonic Current
The output end of section unit connects the input terminal of the simulation shelf depreciation device；
Two fingers that the simulation shelf depreciation device is preheated platform by a constant temperature and is set on the constant temperature preheating platform
Die mould electrode is constituted：One of finger pressure type electrode is connected with the output end of the voltage regulation unit, another finger pressure type electricity
Pole is connected with the earth；
The output end of the simulation shelf depreciation device connects the input terminal of the high-frequency signal analysis module；
The high-frequency signal analysis module is obtaining high frequency partial discharge signal caused by paper oil insulation, including is sequentially connected in series
High Frequency Current Sensor, amplifying circuit, filter circuit, detecting circuit and Voltage Feedback amplifying circuit and regulator circuit, institute
The output end for stating Voltage Feedback amplifying circuit and regulator circuit is connected to the input terminal of signal transmission module；
The signal transmission module is for acquiring Partial Discharge Data and being wirelessly transferred, using microprocessor chip as master
Processor, and by serial communication, carry the wireless transmission of the complete paired data of Zigbee sending modules；
The output end of the Zigbee sending modules connects radio-frequency antenna, by the Zigbee receiving modules for being wirelessly connected to host
Serial ports；
The output end of the signal transmission module connects the input terminal of the host display module；
The host display module, which is used to obtain from signal transmission module, is transmitted through the data come, and carries out shelf depreciation phase spectrogram
With the described point of pulse train phase spectrogram, the results are shown in man-machine interface, and data storage and reading can be carried out.
2. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the preferred static spinning high-voltage source of DC power supply.
3. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the Harmonic Current is made of a single-entry single-out variable-frequency power sources and a testing transformer, the variable-frequency power sources
Output end is connected by three-phase power line with the input terminal of the testing transformer.
4. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the High Frequency Current Sensor connects BNC heads by high frequency coaxial line.
5. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the High Frequency Current Sensor uses the externally positioned type antenna of this lubber ring of Kenneth Rogoff.
6. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the voltage regulation unit is made of two high voltage thin film capacitances and two high-tension resistives.
7. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the constant temperature preheats platform embedded micro-processor program control temperature and configures independent temperature sensing coil probe.
8. the multiple physical field according to claim 1 based on high-frequency method couples paper oil insulation partial discharge detecting system,
It is characterized in that, the host display module is using high-performance ARM chips as microprocessor.
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| CN109581171A (en) * | 2018-12-30 | 2019-04-05 | 天津大学 | High-frequency current method compound field intermediate joint of electric cable partial discharge detecting system |
| CN111707911A (en) * | 2020-06-12 | 2020-09-25 | 天津大学 | Cable buffer layer partial discharge testing device capable of controlling temperature and humidity |
| CN117949794A (en) * | 2024-03-27 | 2024-04-30 | 阳谷新太平洋电缆有限公司 | Cable partial discharge fault detection method |
| WO2024098825A1 (en) * | 2022-11-10 | 2024-05-16 | 云南电网有限责任公司红河供电局 | Method and apparatus for analyzing oil paper insulation cavity defect under effect of harmonics |
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