CN108732471A - Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system - Google Patents

Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system Download PDF

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Publication number
CN108732471A
CN108732471A CN201810385538.7A CN201810385538A CN108732471A CN 108732471 A CN108732471 A CN 108732471A CN 201810385538 A CN201810385538 A CN 201810385538A CN 108732471 A CN108732471 A CN 108732471A
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China
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physical
partial discharge
paper oil
oil insulation
superfrequency
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CN201810385538.7A
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Chinese (zh)
Inventor
朱闻博
杜伯学
苏金刚
姜金鹏
宁江涛
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Tianjin University
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Tianjin University
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Priority to CN201810385538.7A priority Critical patent/CN108732471A/en
Publication of CN108732471A publication Critical patent/CN108732471A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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
    • G01R31/1263Testing 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

Abstract

The present invention discloses a kind of multiple physical field coupling paper oil insulation partial discharge detecting system based on superfrequency method, is mainly made of four multiple physical field coupling paper oil insulation shelf depreciation device, UHF signal pickup assemblies, data transmission unit and host display unit parts;The shelf depreciation device includes DC power supply, Harmonic Current, recombiner unit and simulation shelf depreciation device;The DC power supply connects the input terminal of the recombiner unit with the output end of the Harmonic Current;The output end of the recombiner unit connects the input terminal of the simulation shelf depreciation device;The UHF signal pickup assemblies signal connects the simulation shelf depreciation device;The data transmission unit is sent to host display unit for effectively being acquired to local discharge pulse signal by wireless communication mode.It realizes while applying DC voltage and harmonic voltage, be capable of the complex working condition of accurate simulation converter transformer valve-side sleeve.

Description

Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system
Technical field
The invention belongs to paper oil insulation discharge measuring technical fields, are related to a kind of multiple physical field coupling based on superfrequency method Paper oil insulation partial discharge detecting system.
Background technology
In recent years, the Frequent Accidents of converter power transformer, 2007 years influence China's DC transmission system reliability index It is clearly provided in analysis report:The single-stage forced outage 5 times caused by the change of current becomes the failure caused, 472.13 hours idle times, Single-stage planned outage 4 times, 287.25 hours idle times cause system drop volume to run 1 time.The Insulation Problems of converter power transformer are The main reason for causing failure.The insulation of converter power transformer is based on paper oil insulation, under heat, electric stress effect, oil molecule meeting Aging occurs, paperboard fibres can be broken, and cause insulation degradation.Paper oil insulation deterioration can lead to transformer major insulation, turn-to-turn The serious shelf depreciations of generations such as insulation, connecting terminal insulation, and then edge flashing is developed into, the failures such as bubble-discharge cause absolutely The failures such as short circuit, open circuit occur for edge permanent damage, transformer.
Valve winding in converter transformer has been primarily subjected to the composite voltage effect of different combined-voltage ratios, this to change The paper insulated Characteristics of Partial Discharge of convertor transformer interior oil and AC power transformer built-in electrical insulation shelf depreciation (Partial Discharge, PD) having a certain difference property of characteristic.It is exhausted under DC electric field effect for examination converter power transformer interior insulation Edge performance, IEC standard regulation, the change of current needs to carry out DC break down voltage experiment before becoming manufacture, while carrying out part during pressure resistance and putting Electrical measurement test.Currently, the Characteristics of Partial Discharge of the lower paper oil insulation of alternating voltage effect is studied for many years, formed more complete Theoretical system and analysis method.Recently as high voltage direct current transmission project (High Voltage Direct Current, HVDC) develop, DC voltage, pulse voltage and the lower paper oil insulation partial discharge phenomenon analysis of harmonic voltage effect become research heat Point.But at this stage, the experiment to shelf depreciation under composite voltage both at home and abroad and the research of diagnostic techniques have been still within step Section.
Superfrequency detection method (ultra high frequency, UHF) refers to when shelf depreciation occurring in power equipment Current impulse (rising edge is nanosecond) can be up to the electromagnetic wave of number GHz in internal driving frequency, by detecting this electromagnetic wave Signal realizes Partial Discharge Detection.Superfrequency detection method detects frequency range height (being usually 300-3000MHz), has anti-interference energy The advantages that power is strong, and detection sensitivity is high, the detection, positioning and fault type that can be used for power equipment shelf depreciation class defect are known Not.
Zigbee serial port modules are the 2.4G Zigbee 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 superfrequency method is provided Paper oil insulation partial discharge detecting system is closed, using the Partial Discharge Detecting Technology of UHF antenna, to paper oil insulation under multiple physical field Shelf depreciation defect is diagnosed and is identified.
The present invention is directed to Partial Discharge Detection of the converter transformer valve-side sleeve paper oil insulation under compound field, passes through UHF antenna is combined with DC stacked harmonic voltage device, the highly sensitive paper oil insulation part to operation can be kept Electric discharge is detected, and is transmitted to host by signal acquisition and signal processing, and then description oilpaper is exhausted in terms of shelf depreciation The partial discharge detecting system of edge deterioration
The present invention is to solve technical problem, and the technical solution of proposition is:Multiple physical field based on superfrequency method couples oilpaper Insulated local discharge detecting system, mainly by multiple physical field coupling paper oil insulation shelf depreciation device, UHF signal pickup assemblies, Four parts of data transmission unit and host display unit are constituted;
Multiple physical field coupling paper oil insulation shelf depreciation device include DC power supply, Harmonic Current, recombiner unit and Simulate shelf depreciation device;The DC power supply connects the input terminal of the recombiner unit with the output end of the Harmonic Current;
The simulation shelf depreciation device mainly preheats platform by a constant temperature and two finger pressure type electrodes are constituted:It is therein One finger pressure type electrode is connected with the output end of the recombiner unit, another finger-type electrode is connected with the earth;
The UHF signal pickup assemblies obtaining ultrahigh frequency partial discharge signal caused by paper oil insulation, including according to UHF antenna, amplifying circuit, filter circuit, detecting circuit and the Voltage Feedback amplifying circuit and regulator circuit of secondary concatenation;
The UHF antenna is used by the compound externally positioned type antenna of Archimedian screw and plane equiangular spiral;
The output end of the Voltage Feedback amplifying circuit and regulator circuit is connected to the input terminal of data transmission unit;
The data transmission unit 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 data transmission unit connects radio frequency (Radio Frequency, RF) antenna, passes through wireless connection To the serial ports of the Zigbee receiving modules of host;
The data transmission unit passes through wireless transmission mould for effectively being acquired to local discharge pulse signal Formula is sent to host display unit;
The host display unit, which is used to obtain from data transmission unit, 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 carry out data storage and reading.
The DC power supply is static spinning high-voltage source.
The Harmonic Current is made of a single-entry single-out variable-frequency power sources and a testing transformer.
The recombiner unit is made of two high voltage thin film capacitances and two high-tension resistives.
The data transmission unit is integrated in UHF signal pickup assemblies.
The UHF antenna uses one end for BNC connector, and the other end is the transmission line of high-frequency RF head.
The two level amplification that the amplifying circuit is realized using two model ADL5545 chip-in series.
The filter circuit is three rank butterworth high pass filters, and cutoff frequency is set as 300MHz.
The detecting circuit is made of SMS7630 high-frequency diodes series connection RC charge-discharge circuit.
2 times of amplifications that the Voltage Feedback amplification and regulator circuit are realized using two operational amplifiers in AD8056 chips And voltage follow.
Advantageous effect
1, it realizes while applying DC voltage and harmonic voltage, be capable of the complexity of accurate simulation converter transformer valve-side sleeve Operating mode, and the switching of positive and negative direct current voltage source is quick, ensures experiment safety.The output voltage and frequency of harmonic voltage generator are equal Adjustable, assurance function is perfect.
2, compound helical antenna has better cutoff frequency and smaller size, 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, have a variety of graphic parameter setting functions, visualization decrease of noise functions can be carried out, it can given threshold and sampling interval And supply frequency etc..
5, fully digitalization is shown, 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 superfrequency method, can realize accurate signal capture, by passing through collection result It is wirelessly transmitted to data analysis unit, ensures that safe operation is reliable.
Description of the drawings
Fig. 1 is the voltage recombiner unit circuit interconnect pattern of the present invention;
Fig. 2 is the system structure installation drawing of the present invention;
Fig. 3 is the UHF signal pickup assembly structure diagrams of the present invention;
Fig. 4 is the host display cell structure block diagram of the present invention;
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 based on superfrequency method further illustrated the present invention How paper oil insulation partial discharge detecting system is realized.
The present invention couples the combination of shelf depreciation device by UHF antenna and multiple physical field, to paper oil insulation shelf depreciation It is detected, it is special that shelf depreciation of the paper oil insulation under multiple physical field coupling is described in terms of PRPD and PRPS spectrograms two Sign studies the dielectric properties of converter transformer valve-side sleeve interior insulation.The present invention is reached by following measures:A kind of base is provided Couple paper oil insulation partial discharge detecting system in the multiple physical field of UHF methods, i.e., it is a kind of to be based on UHF antenna and multiple physical field It couples shelf depreciation device and realizes the shelf depreciation dynamic of paper oil insulation and highly sensitive detection.
As shown in Fig. 2, the present invention is based on the multiple physical fields of superfrequency method to couple 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.Including:Multiple physical field couples paper oil insulation office Portion's electric discharge device, UHF signal pickup assemblies, data transmission unit and host display unit.
Multiple physical field coupling paper oil insulation shelf depreciation device include DC power supply, Harmonic Current, recombiner unit and Simulate shelf depreciation device;The DC power supply connects the input terminal of the recombiner unit with the output end of the Harmonic Current.
DC power supply described in the present embodiment is by the eastern gentle and quiet Electrospun high voltage power supply of a positive polarity and a negative polarity east Gentle and quiet Electrospun high voltage power supply is constituted, model DW-P503-1ACDF, and inside is designed using modularized circuit, output voltage stabilizing essence Degree is high, and output voltage is continuously adjustable, and is shown with high-precision output voltage and current digital.
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.
Recombiner unit described in the present embodiment is the noninductive absorbing membrane capacitor of a polypropylene high pressure and a clovershrub High-pressure glass glaze high frequency is noninductive block isolating circuit that discharge resistance is connected in series and the noninductive absorbing membrane capacitance of a polypropylene high pressure The low-pass filter circuit composition that device and a noninductive discharge resistance of clovershrub high-pressure glass glaze high frequency are built.The polypropylene The model EACO-SDD of high pressure is noninductive absorbing membrane capacitor, capacitance are 0.1 μ F, stress levels 20kV, and the clovershrub is high It is 1M Ω to press the model RI80 of the noninductive discharge resistance of glass glaze high frequency, resistance value;Circuit connection is as shown in Figure 1.
It is a model HB-HP-6040 Chinese nation heated at constant temperature platform that shelf depreciation device is simulated described in the present embodiment It is constituted with two finger pressure type electrodes, heating platform is heated up using resistance wire fever, may be implemented to be rapidly heated.Built in platform MCU program control temperatures simultaneously configure independent temperature sensing coil probe, and every difference of panel is less than ± 2 DEG C, it is ensured that the uniform constant temperature of sample is heated, and matches There is the number display of actual temperature and set temperature.One of finger-type electrode is connected with the output end of the recombiner unit, separately One finger-type electrode is connected with the earth.
The structure diagrams of UHF signal pickup assemblies is as shown in figure 3, to obtain UHF local discharge signals, including goes here and there successively The UHF antenna, amplifying circuit, filter circuit, detecting circuit and the Voltage Feedback amplification that connect and regulator circuit, the Voltage Feedback The output end of amplification and regulator circuit is connected to the input terminal of data transmission unit.
UHF antenna described in the present embodiment is used by the compound PCB types constituted of Archimedian screw and plane equiangular spiral Antenna, with the poured with epoxy resin layer that thickness is 1mm, antenna casing inside is hollow reflective chamber, same by high frequency on surface Axis connects BNC heads, can avoid alien crosstalk;
The two level amplification electricity that amplifying circuit described in the present embodiment is realized using two model ADL5545 chip-in series Road, the filter circuit are three rank butterworth high pass filters, and cutoff frequency is set as 300MHz, the detecting circuit by SMS7630 high-frequency diodes series connection RC charge-discharge circuit is constituted, capacitance 1nF and resistance value 5M Ω, the Voltage Feedback amplification 2 times of amplifications using two operational amplifiers realization in AD8056 chips and voltage follow with regulator circuit.
When shelf depreciation occurs for paper oil insulation, the pulse current that the duration is only ns grades, the electricity inspired will produce Magnetic wave can penetrate epoxy material pouring layer, and voltage signal is coupled by external UHF antenna, while be sent to UHF letters Number harvester, needs to be amplified circuit and is amplified herein, then needs to filter out interference noise, such as Hz noise etc. Outer signals carry out detection after signal is filtered.The fertile hereby high-pass filter of three rank Barts in 300MHz or more, has band setting Effect avoids the interference signals such as corona, to capture accurate local discharge signal.
The data transmission unit is used to effectively acquire local discharge pulse signal, and by it by wirelessly passing Defeated pattern is sent to host display unit.
The data transmission unit is using high-performance STM32 series A RM chips as microprocessor (MCU);Specific method It is the A/D conversion modules carried using high-performance ARM chips, the previous stage analog signal received is converted into digital signal, Simultaneously by UART serial communications, it is connected with transmission unit sending module, collected signal is encoded, by wireless Transmission send data to host display unit;The data transmission unit uses ZAuZx_T series Zigbee serial ports transparent transmission moulds Block realizes wireless transmission communication by RF antennas.
The structure diagram of host display unit is as shown in figure 4, for analyzing Partial Discharge Data and being carried out The described point of PRPD and PRPS, and the shelf depreciation state of paper oil insulation is judged, by the result of analysis carry out storage and Inquiry.Using high-performance ARM chips as microprocessor (MCU);Specific method is to utilize STM32 series high-performance ARM chips, By included A/D conversion modules, the previous stage analog signal received is converted into digital signal, the amplitude of the docking collection of letters number Local discharge signal pulse number is measured and calculates, with the size and arteries and veins of measured partial discharge pulse's signal value Number is rushed as foundation to judge the power of power cable shelf depreciation, the described point of PRPD and PRPS spectrograms, unit are carried out with this For 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 UHF methods 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 UHF antenna pours into a mould epoxy one side face between finger-type electrode, and antenna distance sample is about 5cm, and arteries and veins is shown by host setting The electric number of punching is 1000, triggering level 1dB.
3. the voltage magnitude that harmonic voltage generator generates is increased, when shelf depreciation occurs for paper oil insulation, UHF antenna coupling It closes from sample and transfers out the transverse electromagnetic wave signal come, by detecting circuit into obtaining to send after amplification is filtered To effective acquisition pulse signal of ARM, after A/D digital-to-analogue conversions, Zigbee module is reached through UART serial ports, passes through RF antennas Wireless transmission is sent to host display unit;Host also provides man-machine interface and data storage and query function simultaneously, and defeated in real time Go out PRPD and PRPS spectrograms.

Claims (10)

1. the multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system, which is characterized in that mainly by more Physic field coupling paper oil insulation shelf depreciation device, UHF signal pickup assemblies, data transmission unit and host display unit four Part is constituted;
The multiple physical field coupling paper oil insulation shelf depreciation device includes DC power supply, Harmonic Current, recombiner unit and simulation Shelf depreciation device;The DC power supply connects the input terminal of the recombiner unit with the output end of the Harmonic Current;
The output end of the recombiner unit connects the input terminal of the simulation shelf depreciation device;
The simulation shelf depreciation device mainly preheats platform by a constant temperature and two finger pressure type electrodes are constituted:One of those Finger pressure type electrode is connected with the output end of the recombiner unit, another finger-type electrode is connected with the earth;
The UHF signal pickup assemblies signal connects the simulation shelf depreciation device, to obtain caused by paper oil insulation Ultrahigh frequency partial discharge signal;The UHF signal pickup assemblies signal includes the UHF antenna, amplifying circuit, filtering being sequentially connected in series Circuit, detecting circuit and Voltage Feedback amplifying circuit and regulator circuit;
The UHF antenna is used by the compound externally positioned type antenna of Archimedian screw and plane equiangular spiral;
The output end of the Voltage Feedback amplifying circuit and regulator circuit is connected to the input terminal of data transmission unit;
The data transmission unit 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 data transmission unit connects radio-frequency antenna, by the Zigbee receiving modules for being wirelessly connected to host Serial ports;
The data transmission unit is passed for effectively being acquired to local discharge pulse signal by wireless communication mode It send to host display unit;
The host display unit, which is used to obtain from data transmission unit, 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 are carried out.
2. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the DC power supply is static spinning high-voltage source.
3. the multiple physical field according to claim 1 based on superfrequency 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.
4. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the recombiner unit is made of two high voltage thin film capacitances and two high-tension resistives.
5. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the data transmission unit is integrated in UHF signal pickup assemblies.
6. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the UHF antenna uses one end for BNC connector, the other end is the transmission line of high-frequency RF head.
7. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the two level amplification that the amplifying circuit is realized using two model ADL5545 chip-in series.
8. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the filter circuit is three rank butterworth high pass filters, cutoff frequency is set as 300MHz.
9. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, the detecting circuit is made of SMS7630 high-frequency diodes series connection RC charge-discharge circuit.
10. the multiple physical field according to claim 1 based on superfrequency method couples paper oil insulation partial discharge detecting system, It is characterized in that, 2 times that the Voltage Feedback amplification and regulator circuit are realized using two operational amplifiers in AD8056 chips Amplification and voltage follow.
CN201810385538.7A 2018-04-26 2018-04-26 Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system Pending CN108732471A (en)

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