CN107632241A - A kind of apparatus and method for testing paper oil insulation partial discharge characteristic - Google Patents
A kind of apparatus and method for testing paper oil insulation partial discharge characteristic Download PDFInfo
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- CN107632241A CN107632241A CN201710806665.5A CN201710806665A CN107632241A CN 107632241 A CN107632241 A CN 107632241A CN 201710806665 A CN201710806665 A CN 201710806665A CN 107632241 A CN107632241 A CN 107632241A
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Abstract
The present invention provides a kind of apparatus and method for testing paper oil insulation partial discharge characteristic, and described device includes：Needle plate defect electrode model, it is used to the oil immersion cardboard sample being positioned between the pin electrode and plate electrode of needle plate defect electrode model, and is connected with the AC power of alternating current-direct current composite voltage generation unit and dc source to measure the partial discharge quantity of oil immersion cardboard sample；Alternating current-direct current composite voltage generation unit; it is used to provide AC power and dc source to measure the partial discharge quantity of oil immersion cardboard sample; wherein the dc source of alternating current-direct current composite voltage generation unit is connected through DC terminal protective resistance with plate electrode; and dc source parallel filtering electric capacity and resitstance voltage divider; AC power is connected with pin electrode, and AC power parallel coupled capacitor；Detection unit, it is used to gather the local discharge signal of oil immersion cardboard and analyzed.
Description
Technical field
Paper oil insulation shelf depreciation is tested the present invention relates to power instrument fields of measurement, and more particularly, to one kind
The apparatus and method of characteristic.
Background technology
With the generation and development of extra-high voltage DC transmission system, the change of current as key equipment in DC transmission system becomes
The insulating requirements of depressor also accordingly improve.Valve winding in converter transformer is complicated because of operating voltage environment --- bear alternating current
Pressure, DC voltage, alternating current-direct current composite voltage etc., so Insulation Problems protrude, whole DC transmission system will be directly affected
It is stable.
In DC transmission system, converter power transformer plays irreplaceable important function, and its operating condition directly affects
The security reliability of system operation.In the numerous failures of converter power transformer, because dielectric insulation deterioration does not find to be triggered in time
Failure it is of common occurrence.Compared to the operating voltage environment of Winding in Power Transformer, the valve side winding of converter power transformer also subject to
Polarity inversion voltage when DC voltage, alternating current-direct current mixed-voltage and trend are overturn.Major insulation as converter power transformer is situated between
The transformer oil and laminated paper board of matter, due to the ratio between oil and cardboard dielectric constant (about 1:And the ratio between resistivity about (1 2):
100) differ larger, so in the DC electric field in the AC field being distributed by dielectric constant and by resistivity distribution, oilpaper
Very big difference be present in the Electric Field Distribution of compound inslation medium.Difference based on Electric Field Distribution, to take into account the two, the valve side of change of current change
The corresponding insulating requirements of winding are more severe.
Because non-uniform electric field can cause internal field to concentrate, cause shelf depreciation, destroy insulation system, converter power transformer
All non-uniform electric field can be avoided the occurrence of during design and installation as far as possible.But in Practical Project, mechanical stress effect, add
The factors such as work technique, ageing equipment, which may cause in converter power transformer, there is metal part wedge angle or seamed edge, causes current situation
The concentration of portion's electric field.If electric field exceedes the energy needed for surrounding medium ionization, then shelf depreciation just occur in Insulated positions, sternly
It will cause equipment fault during weight.Therefore, design invention paper oil insulation partial discharge test system, consider different voltage forms with
And not influence of the same electric field form to Characteristics of Partial Discharge, meet operation work of the paper oil insulation in HVDC transmission system
Condition.
At present, the experiment for paper oil insulation partial discharge characteristic is mainly carried out under alternating voltage, and to oil immersion
The Characteristics of Partial Discharge experiment that cardboard (or abbreviation oilpaper, cardboard) is carried out under alternating voltage can not reflect actual working environment
In oil immersion cardboard Characteristics of Partial Discharge.
The content of the invention
It can not reflect oilpaper in actual working environment to solve existing for background technology to test oilpaper under alternating voltage
The problem of Characteristics of Partial Discharge, the present invention provide a kind of device for testing paper oil insulation partial discharge characteristic.Described device includes：
Needle plate defect electrode model, it, which is used to measure, is positioned between the pin electrode and plate electrode of needle plate defect electrode model
Oil immersion cardboard sample partial discharge quantity；
Alternating current-direct current composite voltage generation unit, it is used to provide alternating current to measure the partial discharge quantity of oil immersion cardboard sample
Source and dc source, wherein the dc source of alternating current-direct current composite voltage generation unit is through DC terminal protective resistance and plate electrode phase
Even, AC power is connected with pin electrode；
Detection unit, its local discharge signal for being used to gather oil immersion cardboard simultaneously carry out the analysis of Characteristics of Partial Discharge.
Preferably, described device also includes display unit, and it is used to show that detection unit divides local discharge signal
The result of analysis.
Preferably, the pin electrode of the needle plate defect electrode model and plate electrode are earth-free.
Preferably, the dc source of the alternating current-direct current composite voltage generation unit and AC power are using mode altogether.
Preferably, the measuring unit is PD meter, and the detection impedance inside the PD meter is connected with coupled capacitor, and
The coupled capacitor is in parallel with AC power, so that coupled capacitor together constitutes with complete pulse in AC and detection impedance
Loop, local discharge signal is detected in coupled capacitor side by detecting impedance.
Preferably, the alternating voltage applied using high-voltage probe connection oscilloscope measurement AC power to oil immersion cardboard, and
Resitstance voltage divider is connected between the direct current receiving end and ground of oil immersion cardboard to measure the direct current that dc source applies to oil immersion cardboard
Voltage, wherein resitstance voltage divider parallel filtering electric capacity, the filter capacitor are used to filter out ripple caused by dc source.
Preferably, AC power uses high pressure Harmonic Current.
According to another aspect of the present invention, the present invention provides a kind of method for testing paper oil insulation partial discharge characteristic.Institute
The method of stating includes：
Oil immersion cardboard is positioned in the lubricating cup of needle plate defect model, wherein, cardboard one side is positioned on plate electrode, another side
With the nib contacts of pin electroplax；
The DC voltage for adjusting dc source output is preset voltage value, and tested oil immersion cardboard is applied by dc source
DC voltage, and oil immersion cardboard is started from scratch by AC power and gradually applies alternating voltage；
When measuring oil immersion cardboard generation local discharge signal for the first time, default DC voltage value and alternating current are raised
Pressure value, and in rise predetermined DC voltage every time and alternating voltage, the office of tested sample is gathered within the default sampling time
Portion's discharge signal.
Preferably, methods described is also included according to the oil immersion cardboard measured in different magnitudes of voltage, different stages of development
Partial discharge quantity obtain the phase-resolved shelf depreciation PRPD collection of illustrative plates of tested oil immersion cardboard.
Preferably, the AC power is high pressure Harmonic Current.AC power uses high-voltage harmonic source, can export simultaneously more
The superposition of kind of harmonic wave, and each harmonic voltage magnitude can be controlled respectively, so as to the reality in preferably analog DC power transmission engineering
Operating mode.
Preferably, DC voltage and the ratio of alternating voltage and the harmonic components of alternating voltage are changed to obtain different electricity
The Characteristics of Partial Discharge of oil immersion cardboard under swaging formula.
Compared with prior art, technical scheme proposes a kind of test oil to technical scheme provided by the present invention
The apparatus and method of paper insulation Characteristics of Partial Discharge, the technical scheme make paper oil insulation material under alternating current-direct current composite voltage
In shelf depreciation process and real transformer more closely, in partial-discharge measuring device under the alternating current-direct current composite voltage,
AC power can be Harmonic Current, change DC voltage and the ratio of alternating voltage and the harmonic components of alternating voltage obtain not
Tested with the Characteristics of Partial Discharge of oil immersion cardboard under voltage form, while using needle plate defect model lubricating cup, with actual change
It is more because defect generation field strength centrostigma situation is more similar in manufacturing process, so as to fully be connect with actual condition in depressor
On the premise of near, the electric property of insulating board material under different alternating current-direct current composite voltage types is effectively analyzed.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is the structure chart of the device of the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention；
Fig. 2 is the needle plate defect electrode of the device of the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention
The structure chart of model；
Fig. 3 is the flow chart of the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention；
Fig. 4 is the PRPD spectrums that the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention is drawn
One embodiment of figure；
Fig. 5 is the PRPD spectrums that the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention is drawn
Another embodiment of figure.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the structure chart of the device of the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention.Such as Fig. 1
Shown, described device 100 includes needle plate defect electrode model 101, combined-voltage generation unit 102, detection unit 103 and shown
Show unit 104.
Fig. 2 is the needle plate defect electrode of the device of the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention
The structure chart of model.As shown in Fig. 2 the needle plate defect electrode model 101 includes pin electrode 111, plate electrode 112 and lubricating cup
113.The needle plate defect model is that occur metal part wedge angle or seamed edge generation in simulation Practical Project in converter power transformer
Electric field concentrate and design.
Needle plate defect electrode model 101, it is used to measure the pin electrode 111 for being positioned over needle plate defect electrode model and plate electricity
The partial discharge quantity of oil immersion cardboard sample between pole 112.
Alternating current-direct current composite voltage generation unit 102, it is used to provide friendship to measure the partial discharge quantity of oil immersion cardboard sample
Stream power supply 121 and dc source 122, the dc source 122 of wherein alternating current-direct current composite voltage generation unit 102 are protected through DC terminal
Resistance 129 is connected with plate electrode 112, and AC power 121 is connected with pin electrode 111.
Detection unit 103, its local discharge signal for being used to gather oil immersion cardboard simultaneously carry out the analysis of Characteristics of Partial Discharge.
Preferably, described device also includes display unit 104, and it is used to show that detection unit carries out local discharge signal
The result of analysis.
Preferably, the pin electrode of the needle plate defect electrode model and plate electrode are earth-free.
Preferably, the dc source of the alternating current-direct current composite voltage generation unit and AC power are using mode altogether.
Preferably, the detection unit 103 is PD meter, and the detection impedance inside the PD meter connects with coupled capacitor
Connect, and the coupled capacitor 126 is in parallel with AC power 121, so that coupled capacitor 126 is in AC and detection impedance 131
Complete pulse circuit is together constituted with, local discharge signal is detected in the side of coupled capacitor 126 by detecting impedance 131.
Preferably, the friendship applied using the connection measurement of oscillograph 124 AC power 121 of high-voltage probe 125 to oil immersion cardboard
Voltage is flowed, and resitstance voltage divider 128 is connected to measure dc source to oil-paper between the direct current receiving end and ground of oil immersion cardboard
The DC voltage that plate applies, wherein the parallel filtering electric capacity 127 of resitstance voltage divider 126, the filter capacitor 127 are used to filter out direct current
Ripple caused by power supply 122.When described device detects discharge pulse, the direct current at recording needle board defect electrode model both ends
Pressure and alternating voltage, the after testing analysis of unit 103 can obtain part of the oil-paper plate sample under alternating current-direct current composite voltage and put
Electrical feature.
Preferably, AC power uses high pressure Harmonic Current.
According to another aspect of the present invention, the present invention provides a kind of method for testing paper oil insulation partial discharge characteristic.
Fig. 3 is the flow chart of the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention.Such as Fig. 3
Shown, methods described 300 is since step 301.
In step 301, oil immersion cardboard is positioned in the lubricating cup of needle plate defect model, wherein, cardboard one side is positioned over plate
On extremely, the nib contacts of another side and pin electroplax.
The method for handling oil immersion cardboard is to remove water cardboard, is placed in vacuum drying oven, in drying 48 in 120 DEG C of vacuums
Hour, the moisture for absorption of being made moist in cardboard is removed, reduces interference of the moisture to aging.Pass through the pressure between vacuum and atmospheric pressure
Difference, transformer oil is pumped into vacuum drying oven by flexible pipe, and injected in the lubricating cup where insulating board, immersion 100 hours with
On, make the abundant immersion oil of cardboard, then the oil immersion cardboard handled well is placed in Fig. 2 needle plate defect model lubricating cup, cardboard is placed
In on plate electrode, cardboard is close at pin electrode tip.
In step 302, the DC voltage of regulation dc source output is preset voltage value, by dc source to tested oil
Impregnated paper plate applies DC voltage, and oil immersion cardboard is started from scratch by AC power and gradually applies alternating voltage.
In step 303, when measuring oil immersion cardboard generation local discharge signal for the first time, default DC voltage is raised
Value and ac voltage, and in rise predetermined DC voltage every time and alternating voltage, quilt is gathered within the default sampling time
The local discharge signal of test specimens.
Preferably, methods described is also included according to the oil immersion cardboard measured in different magnitudes of voltage, different stages of development
Partial discharge quantity obtain the phase-resolved shelf depreciation PRPD collection of illustrative plates of tested oil immersion cardboard.
Local discharge signal is detected by the AC coupled capacitor of combined-voltage generation unit 102 using PD meter.
The combined-voltage of application gradually increase since 0, according to alternating voltage and the ratio of the size 1 to 1 of DC voltage, with first straight
The sequential steps boosting exchanged after stream, the partial discharge inception voltage of oil immersion cardboard sample is measured, is protected after shelf depreciation generation
Combined-voltage boosting gradient is held, gathers accumulated discharge amount in the 300s times.
After tested, the partial discharge inception voltage of oil immersion cardboard is about 14kV, in initial discharge under alternating current-direct current composite voltage
PRPD spectrograms in the accumulative 300s times are as shown in Figure 4.
Fig. 4 is the PRPD that the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention is drawn
One embodiment of (pulse train of phase explanation, Phase Resolved Pluse Sequence) spectrogram.Can be with from figure
Find out, shelf depreciation is distributed in alternating voltage positive-negative half-cycle.
With the rise of alternating current-direct current composite voltage, partial discharge quantity increase, paper oil insulation electric discharge continues to develop, developing stage
The PRPD spectrograms added up under middle alternating current-direct current composite voltage in the 300s times are as shown in Figure 5.
Fig. 5 is the PRPD spectrums that the method for the test paper oil insulation partial discharge characteristic of the specific embodiment of the invention is drawn
Another embodiment of figure.It can be seen that the partial discharge quantity phase distribution scope positioned at alternating voltage positive-negative half-cycle
Increase, the very big region of outlet partial discharge quantity at negative half period peak value.
Preferably, the AC power is high pressure Harmonic Current.
Preferably, DC voltage and the ratio of alternating voltage and the harmonic components of alternating voltage are changed to obtain different electricity
The Characteristics of Partial Discharge of oil immersion cardboard under swaging formula.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do【Device, component etc.】" all it is opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (11)
1. a kind of device for testing paper oil insulation partial discharge characteristic, it is characterised in that described device includes：
Needle plate defect electrode model, it is used to measure the oil being positioned between the pin electrode and plate electrode of needle plate defect electrode model
The partial discharge quantity of impregnated paper plate sample；
Alternating current-direct current composite voltage generation unit, its be used for for measure oil immersion cardboard sample partial discharge quantity provides AC power with
Dc source, the wherein dc source of alternating current-direct current composite voltage generation unit are connected through DC terminal protective resistance with plate electrode, hand over
Stream power supply is connected with pin electrode；
Detection unit, its local discharge signal for being used to gather oil immersion cardboard simultaneously carry out the analysis of Characteristics of Partial Discharge.
2. device according to claim 1, it is characterised in that described device also includes：Display unit, it is used to show inspection
Survey the result that unit is analyzed local discharge signal.
3. device according to claim 1, it is characterised in that the pin electrode and plate electrode of the needle plate defect electrode model
It is earth-free.
4. device according to claim 1, it is characterised in that the dc source of the alternating current-direct current composite voltage generation unit
With AC power using mode altogether.
5. device according to claim 1, it is characterised in that the detection unit is PD meter, inside the PD meter
Detection impedance be connected with coupled capacitor, and the coupled capacitor is in parallel with AC power, so that coupled capacitor is in AC
Complete pulse circuit is together constituted with detection impedance, local discharge signal is detected in coupled capacitor side by detecting impedance.
6. according to device any one of in claim 1 to 5, it is characterised in that connect oscillograph using high-voltage probe
The alternating voltage that measurement AC power applies to oil immersion cardboard, and resistance point is connected between the direct current receiving end and ground of oil immersion cardboard
Depressor is to measure the DC voltage that dc source applies to oil immersion cardboard, wherein resitstance voltage divider parallel filtering electric capacity, the filter
Ripple electric capacity is used to filter out ripple caused by dc source.
7. device according to claim 1, it is characterised in that AC power uses high pressure Harmonic Current.
A kind of 8. method for testing paper oil insulation partial discharge characteristic, it is characterised in that methods described includes：
Oil immersion cardboard is positioned in the lubricating cup of needle plate defect model, wherein, cardboard one side is positioned on plate electrode, another side and pin
The nib contacts of electroplax；
The DC voltage for adjusting dc source output is preset voltage value, applies direct current to tested oil immersion cardboard by dc source
Voltage, and oil immersion cardboard is started from scratch by AC power and gradually applies alternating voltage；
When measuring oil immersion cardboard generation local discharge signal for the first time, default DC voltage value and alternating voltage are raised
Value, and in rise predetermined DC voltage every time and alternating voltage, the part of tested sample is gathered within the default sampling time
Discharge signal.
9. according to the method for claim 8, it is characterised in that methods described is also included according in different magnitudes of voltage, difference
The partial discharge quantity of the oil immersion cardboard measured in developing stage obtains the phase-resolved shelf depreciation of tested oil immersion cardboard
PRPD collection of illustrative plates.
10. according to the method for claim 8, it is characterised in that the AC power is high pressure Harmonic Current.
11. according to the method for claim 8, it is characterised in that change ratio and the friendship of DC voltage and alternating voltage
The harmonic components for flowing voltage obtain the Characteristics of Partial Discharge of oil immersion cardboard under different voltage forms.
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Cited By (10)
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| CN108535610A (en) * | 2018-03-27 | 2018-09-14 | 哈尔滨理工大学 | A kind of experimental rig of transformer oil paper insulation void defects electric discharge research |
| CN108761291A (en) * | 2018-07-19 | 2018-11-06 | 山东大学 | Composite voltage knit stitch leaf fat gap shelf depreciation models and analysis method |
| CN109239539A (en) * | 2018-07-23 | 2019-01-18 | 国家电网有限公司 | A kind of device and experimental method for studying epoxy insulation material Characteristics of Partial Discharge |
| CN109870638A (en) * | 2019-02-25 | 2019-06-11 | 华能国际电力股份有限公司 | A kind of shelf depreciation defects simulation test entity transformer |
| CN110554268A (en) * | 2019-10-14 | 2019-12-10 | 华北电力大学 | composite insulator mandrel aging state testing method and device based on moisture absorption amount |
| CN111880049A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111880050A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
| CN113433427A (en) * | 2020-03-23 | 2021-09-24 | 西安高压电器研究院有限责任公司 | Insulating property detection circuit and method |
| CN113533910A (en) * | 2021-06-10 | 2021-10-22 | 中国电力科学研究院有限公司 | Method and system suitable for converter transformer partial discharge early warning |
| CN114563663A (en) * | 2022-01-18 | 2022-05-31 | 山东大学 | Experimental device and method for discharging in transformer oil under alternating voltage |
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| CN108535610A (en) * | 2018-03-27 | 2018-09-14 | 哈尔滨理工大学 | A kind of experimental rig of transformer oil paper insulation void defects electric discharge research |
| CN108761291A (en) * | 2018-07-19 | 2018-11-06 | 山东大学 | Composite voltage knit stitch leaf fat gap shelf depreciation models and analysis method |
| CN108761291B (en) * | 2018-07-19 | 2019-10-11 | 山东大学 | The modeling of composite voltage knit stitch leaf fat gap shelf depreciation and analysis method |
| CN109239539A (en) * | 2018-07-23 | 2019-01-18 | 国家电网有限公司 | A kind of device and experimental method for studying epoxy insulation material Characteristics of Partial Discharge |
| CN109239539B (en) * | 2018-07-23 | 2021-08-17 | 国家电网有限公司 | Device and experimental method for researching partial discharge characteristics of epoxy insulating material |
| CN109870638A (en) * | 2019-02-25 | 2019-06-11 | 华能国际电力股份有限公司 | A kind of shelf depreciation defects simulation test entity transformer |
| CN110554268A (en) * | 2019-10-14 | 2019-12-10 | 华北电力大学 | composite insulator mandrel aging state testing method and device based on moisture absorption amount |
| CN113433427A (en) * | 2020-03-23 | 2021-09-24 | 西安高压电器研究院有限责任公司 | Insulating property detection circuit and method |
| CN113433427B (en) * | 2020-03-23 | 2023-09-05 | 西安高压电器研究院常州有限责任公司 | Insulation performance detection circuit and method |
| CN111880049A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111880049B (en) * | 2020-05-27 | 2021-09-10 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111880050A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
| CN113533910A (en) * | 2021-06-10 | 2021-10-22 | 中国电力科学研究院有限公司 | Method and system suitable for converter transformer partial discharge early warning |
| CN114563663A (en) * | 2022-01-18 | 2022-05-31 | 山东大学 | Experimental device and method for discharging in transformer oil under alternating voltage |
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