CN109917212A - The experimental system and method for a kind of simulation converter power transformer inside electric heating stress - Google Patents
The experimental system and method for a kind of simulation converter power transformer inside electric heating stress Download PDFInfo
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- CN109917212A CN109917212A CN201910266423.0A CN201910266423A CN109917212A CN 109917212 A CN109917212 A CN 109917212A CN 201910266423 A CN201910266423 A CN 201910266423A CN 109917212 A CN109917212 A CN 109917212A
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Abstract
The invention discloses the experimental systems and method of electric heating stress inside a kind of simulation converter power transformer, belong to major insulation System design technology field inside converter power transformer.Including vacuum impregnation unit and thermal-electrical aging unit；Wherein: vacuum impregnation unit is the vacuum impregnation tank for being loaded with the transformer oil through being dehydrated degassing process, for carrying out oil immersion processing to insulating board；Thermal-electrical aging unit, including electrical power control cabinet, power cabinet and thermal-electrical aging tank are equipped with board-to-board electrode mechanism in thermal-electrical aging tank, are additionally provided with automatic temperature control device on thermal-electrical aging tank；Power cabinet, for providing voltage for the board-to-board electrode mechanism in electrical power control cabinet and thermal-electrical aging tank；Electrical power control cabinet is connected with power cabinet, for the electric voltage frequency in adjustable plate-plate electrode mechanism.The present invention can simulate the failure in converter power transformer under built-in electrical insulation receiving combined stress, can accurately study the electric property of paper oil insulation under compound electro-thermal stress, and strong operability and high reliablity.
Description
Technical field
The invention belongs to major insulation System design technology fields inside converter power transformer, and in particular to a kind of simulation change of current change
The experimental system and method for electric heating stress inside depressor.
Background technique
With the fast development of China's extra-high voltage direct-current transmission engineering, voltage class is that the extra-high voltage direct-current of ± 1100kV is defeated
Electrical engineering has also been put into operation.However, the fast development of power transmission engineering does not rapidly promote corresponding converter power transformer system
Technology development is made, therefore, converter power transformer still suffers from many challenges as the extra-high voltage equipment in DC transmission engineering.
Currently, the design of major insulation system is still consistent with traditional AC transformer inside converter power transformer, all
It is to be made of Oil-Paper Insulation.Only the performance parameter of specific transformer oil and insulating paper is further improved.Cause
For since the eighties of last century, Oil-Paper Insulation is by its excellent electrical characteristic and aging characteristics as special compound of one kind
Dielectric is widely used in the power equipments such as transformer and casing.However, converter power transformer is different from traditional exchange
Transformer is a little that the part major insulation of converter transformer valve-side connection converter valve is bearing transformer itself operating temperature
While acted on also subject to DC voltage or DC voltage component, and under direct current and polarity reversal voltage there are space charge and
Transient voltage distribution problem.Therefore, at present valve winding in converter transformer bear high temperature and multiple voltage waveform effect
In the case of, major insulation failure rate can not have always been high any more.
According to international bulk power grid tissue (CIGRE) publication a large amount of fault statistics analysis shows, the failure of converter power transformer
Rate is about nearly twice of AC transformer, and in operating condition operational process, the insulation fault of converter power transformer accounts for whole failures
Half, and significantly larger than traditional AC transformer.Therefore, research converter transformer valve-side is in the compound of different voltages waveform
Failure evolution and failure mechanism of production under electric field and high temperature action have highly important meaning to practical engineering application
Justice.
But there is not the correlation for the insulation fault that can carry out converter power transformer in laboratory environments also in the prior art
The device of simulated experiment.
Summary of the invention
The purpose of the present invention is to provide the experimental provisions and method of electric heating stress inside a kind of simulation converter power transformer, should
Apparatus structure design is reasonable, using simple；This method can under accurate simulation combined stress paper oil insulation electric property, can grasp
The property made is strong, high reliablity.
In order to achieve the above object, the present invention is achieved by the following scheme:
The invention discloses a kind of experimental systems of electric heating stress inside simulation converter power transformer, including vacuum impregnation unit
With thermal-electrical aging unit；Wherein:
Vacuum impregnation unit is the vacuum impregnation tank for being loaded with the transformer oil through being dehydrated degassing process, for insulating paper
Plate carries out oil immersion processing；
Thermal-electrical aging unit, including electrical power control cabinet, power cabinet and thermal-electrical aging tank are equipped with plate-in thermal-electrical aging tank
Plate electrode mechanism is additionally provided with automatic temperature control device on thermal-electrical aging tank；
Power cabinet, for providing voltage for the board-to-board electrode mechanism in electrical power control cabinet and thermal-electrical aging tank；
Electrical power control cabinet is connected with power cabinet, for the electric voltage frequency in adjustable plate-plate electrode mechanism；
When experiment, the oil immersion cardboard that oil immersion is completed in vacuum impregnation tank is placed in two electrodes of board-to-board electrode mechanism
Between plate, voltage is applied to oil immersion cardboard by power cabinet, while voltage course is applied to oil immersion cardboard by automatic temperature control device
In temperature carry out stable regulation, complete the experiment under electricity, hot combined stress.
Preferably, further include supporter for placing thermal-electrical aging tank.
Preferably, several are arranged in thermal-electrical aging tank, several thermal-electrical aging tanks provide electricity needed for experiment by power cabinet
Pressure.
Preferably, it is direct current, 50Hz exchange and 50- that electrical power control cabinet, which applies alive mode to board-to-board electrode mechanism,
The combination of one or more of 1000Hz frequency-changing AC.
The invention also discloses the experiment sides based on the experimental system of electric heating stress inside above-mentioned simulation converter power transformer
Method, comprising the following steps:
1) insulating board is placed in the vacuum impregnation tank for being loaded with the transformer oil through being dehydrated degassing process, in 80~90
At DEG C vacuum impregnation processing 12~for 24 hours, be cooled to room temperature, be made oil immersion cardboard；
2) voltage is applied to oil immersion cardboard by power cabinet, while voltage mistake is applied to oil immersion cardboard by automatic temperature control device
Experimental temperature in journey is adjusted, and completes the thermal-electrical aging experiment under electricity, hot combined stress, obtains in simulation converter power transformer
Electric, the hot combined stress result that built-in electrical insulation is born.
Preferably, in step 1), it is described through be dehydrated degassing process transformer oil be by transformer oil 100pa with
Under, processing 12 under conditions of 60 DEG C~80 DEG C~be made afterwards for 24 hours.
It is further preferred that micro-water content≤5ppm of the transformer oil after dehydration degassing process, gas content≤
0.1%, impurity granularity≤3 μm.
It is further preferred that the transformer oil is the Kelamayi 50# transformer oil.
Preferably, the insulating board is using preceding 24~48h of drying and processing under the conditions of 90 DEG C~110 DEG C, and treated
Moisture content≤0.2% of insulating board.
Preferably, the insulating board is Wei Deman insulating board, having a size of 17cm × 17cm, with a thickness of 1mm.
Compared with prior art, the invention has the following advantages:
The experimental system of electric heating stress, is by vacuum impregnation unit and electricity inside simulation converter power transformer disclosed by the invention
The experiment porch that heat ageing unit is built, wherein vacuum impregnation unit is used to impregnate transformer oil to insulating board, makes it
As oil immersion cardboard；Thermal-electrical aging unit includes electrical power control cabinet, power cabinet and the thermal-electrical aging tank with automatic temperature control device,
Arranging plate-plate electrode mechanism in thermal-electrical aging tank, power cabinet apply voltage to oil immersion cardboard by board-to-board electrode mechanism, by
It is the equipment with temperature controller in thermal-electrical aging tank, oil-paper can also be adjusted while applying voltage to oil immersion cardboard
The temperature of plate local environment makes it keep a metastable experimental temperature, so that the electricity, heat under simulating complex working condition are compound
Stress.Apparatus structure design is rationally, easy to operate.
Experimental method disclosed by the invention based on above-mentioned experimental system, by using the transformer through being dehydrated degassing process
Oil-impregnated insulating board forms it into oil immersion cardboard, then takes out the oil immersion cardboard being sufficiently impregnated and applies voltage to it, simultaneously
The local environment temperature that oil immersion cardboard is controlled during applying voltage completes the experiment under electricity, hot combined stress.This method
The combined stress of converter power transformer built-in electrical insulation receiving can be simulated, the electric heating of paper oil insulation is answered under accurate simulation complex working condition
Power, and strong operability, high reliablity can be widely used in the simulation of converter power transformer working condition and its mechanism study neck
Domain.
Detailed description of the invention
Fig. 1 is the experimental system structural schematic diagram of electric heating stress inside simulation converter power transformer of the invention；
Fig. 2 is the board-to-board electrode structure schematic diagram in thermal-electrical aging tank.
Wherein, 1 is electrical power control cabinet；2 be power cabinet；3 be thermal-electrical aging tank；4 be supporter；5 be oil immersion cardboard；6 are
Electrode plate.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction with the embodiment of the present invention and attached
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
The embodiment of a part is invented, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, should fall within the scope of the present invention.
It should be noted that term " includes " in description and claims of this specification and " having " and they
Any deformation, it is intended that cover it is non-exclusive include, for example, containing the process, method of a series of steps or units, being
System, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or
For the intrinsic other step or units of these process, methods, product or equipment.
The invention will be described in further detail for example with reference to the accompanying drawing and specifically:
Referring to Fig. 1, for the experimental system of electric heating stress inside a kind of simulation converter power transformer of the invention, including Vaccum Permeating
Stain unit and thermal-electrical aging unit；
Vacuum impregnation unit is the vacuum impregnation tank for being loaded with the transformer oil through being dehydrated degassing process, for insulating paper
Plate carries out oil immersion processing；
Thermal-electrical aging unit, including electrical power control cabinet 1, power cabinet 2 and thermal-electrical aging tank 3, are equipped in thermal-electrical aging tank 3
Board-to-board electrode mechanism is additionally provided with automatic temperature control device on thermal-electrical aging tank 3；
Power cabinet 2, for providing voltage for the board-to-board electrode mechanism in electrical power control cabinet 1 and thermal-electrical aging tank 3；
Electrical power control cabinet 1 is connected with power cabinet 2, for the electric voltage frequency in adjustable plate-plate electrode mechanism；
When experiment, the oil immersion cardboard 5 that oil immersion is completed in vacuum impregnation tank is placed in two electrodes of board-to-board electrode mechanism
Between plate 6, voltage is applied to oil immersion cardboard 5 by power cabinet 2, while voltage is applied to oil immersion cardboard 5 by automatic temperature control device
Temperature in the process carries out stable regulation, completes the experiment under electricity, hot combined stress.
Further, it is possible to which thermal-electrical aging tank 3 is placed on supporter 4, experimental implementation is facilitated by setting supporter 4.Together
When, thermal-electrical aging tank 3 of the invention can be set it is multiple, i.e., test can with multiple groups experiment and meanwhile carry out, several thermal-electrical agings
Tank 3 provides voltage by power cabinet 2, and is changed by the electric voltage frequency that the control of electrical power control cabinet 1 applies.
Further, in order to simulate the various complex working conditions of converter power transformer, electrical power control cabinet 1 is to the plate-in thermal-electrical aging tank 3
It is diversification that plate electrode mechanism, which applies alive form, can be one in direct current, 50Hz exchange and 650Hz frequency-changing AC
Kind or two kinds of combinations, even three kinds of combinations.
The advantages of thermal-electrical aging tank 3 that the present invention uses: about 200 degrees Celsius of high temperature resistant, temperature control accurate testing.Vacuum degree can
To reach 10pa hereinafter, and itself being resistant to 6 times of standard atmospheric pressure.
The output of the adjustable power supply of electrical power control cabinet 1, and it is respectively straight so that power cabinet 2 is worked at the same time three kinds of voltage sources of output
Stream exchanges (50Hz), high-frequency ac (50-1000Hz), therefore can simulate the thermal-electrical aging experiment under the conditions of different voltages.
Experimental method disclosed by the invention using electric heating stress system inside above-mentioned simulation converter power transformer, including with
Lower step:
1) filtered Kelamayi transformer oil is injected into the bottle,suction of magnetic stirring bar, is vacuumized in bottle,
So that pressure is remained to 100pa hereinafter, being heated to 60 DEG C to bottle,suction simultaneously and being kept for 12 hours, 50# grams of dehydration degassing is made
La Mayi transformer oil；It is required that: the parameter value for being dehydrated the Kelamayi transformer oil of degassing is answered are as follows: micro-water content≤5ppm, gas
Body content≤0.1%, impurity granularity≤3 μm.
2) insulating board is put into baking oven, dries 24 hours and is pre-processed under the conditions of 90 DEG C, insulating board warp
Pretreated moisture content≤0.2%；
3) Kelamayi the 50# transformer oil of dehydration degassing is injected into and is placed with step 2) treated the true of insulating board
In empty impregnating autoclave, and it is to impregnate 12 hours in 80 DEG C of vacuum drying ovens that the tank body after the completion of oiling, which is put into temperature, forms sufficiently leaching
Tank body is taken out from baking oven, makes its cooled to room temperature by the oil immersion cardboard of stain, and oil immersion cardboard is made；
4) the board-to-board copper electrode for being 150mm with diameter applies voltage to oil immersion cardboard, while to the electricity that insulating board is housed
Heat ageing tank adjusts suitable temperature to complete the experiment of electric heating stress inside simulation converter power transformer.
In experimentation, temperature controlling range is 0~200 degree Celsius, and the time is indefinite, and temperature rises to needed for specific experiment
Preset temperature when can stop working, natural cooling, when temperature be lower than preset temperature when, it is straight that temperature controller begins to work
To being stabilized to preset temperature.
Example: experimental design, by treated, oily and paper is fitted into 3 tank body of thermal-electrical aging tank, and nitrogen is injected after vacuumizing, is made
An atmospheric pressure is remained in tank body.Then the pot temperature for adjusting thermal-electrical aging tank 3 is 130 degrees Celsius, after temperature is stablized,
Apply the voltage (6kV+2kV+2kV) of direct current+exchange (50Hz)+frequency-changing AC (650Hz) to 3 tank body of thermal-electrical aging tank.
When being tested using the method for the present invention, converter power transformer can be sufficiently simulated under normal operation circumstances, it is internal
Insulate born combined stress.
The purchase of electrical power control cabinet used in the present invention expands the insulating materials that polyelectron Technology Co., Ltd. produces from Xi'an
Test combinations power cabinet.
The experimental method of electric heating stress passes through to pretreated transformer inside the simulation converter power transformer that the present invention opens
Then oil immersion cardboard is used plate electrode persistent pressure by the hybrid infusion of oil and insulating board, by adjusting thermal-electrical aging tank
The mode of body temperature simulates in actual condition the combined stress that paper oil insulation is born in converter power transformer, due to answering compound
The part of power effect is easy to happen failure, therefore can design this experiment under the feasible experiment condition in laboratory, it is thus possible to
It was found that the origin of failure, the solution of trouble-shooting.This experimental method can optimize survey close to converter power transformer actual condition
Experimental method of the formation testing impregnated paper plate under combined stress.It is exhausted that this method can be widely applied to oilpaper inside simulation converter power transformer
The working environment of edge makes experiment in laboratory environments closer to operating condition reality.
The method of the present invention with the Kelamayi 50# transformer oil and insulating board (thickness in monolayer 1mm) for laboratory sample, diameter
150mm plate electrode is experimental tool to oil immersion cardboard pressurized treatments, while passing through the automatic temperature control system in thermal-electrical aging tank
Control the temperature of oil immersion cardboard.
After completing the pretreatment of transformer oil and insulating board, transformer oil is injected into equipped with pretreated rapidly
Paper is set to be sufficiently impregnated forming oil immersion cardboard in the dipping tank body of insulating board, then to the oil immersion cardboard of thermal-electrical aging tank interior
Apply voltage, while adjusting thermal-electrical aging pot temperature, completes the simulated experiment under the effect of electric heating combined stress.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. the experimental system of electric heating stress inside a kind of simulation converter power transformer, which is characterized in that including vacuum impregnation unit and
Thermal-electrical aging unit；Wherein:
Vacuum impregnation unit be loaded with through be dehydrated degassing process transformer oil vacuum impregnation tank, for insulating board into
Row oil immersion processing；
Thermal-electrical aging unit, including electrical power control cabinet (1), power cabinet (2) and thermal-electrical aging tank (3), in thermal-electrical aging tank (3)
Equipped with board-to-board electrode mechanism, thermal-electrical aging tank is additionally provided with automatic temperature control device on (3)；
Power cabinet (2), for providing voltage for the board-to-board electrode mechanism in electrical power control cabinet (1) and thermal-electrical aging tank (3)；
Electrical power control cabinet (1) is connected with power cabinet (2), for the electric voltage frequency in adjustable plate-plate electrode mechanism；
When experiment, the oil immersion cardboard (5) that oil immersion is completed in vacuum impregnation tank is placed in two electrode plates of board-to-board electrode mechanism
(6) between, voltage is applied to oil immersion cardboard (5) by power cabinet (2), while applying to oil immersion cardboard (5) by automatic temperature control device
Temperature during making alive carries out stable regulation, completes the experiment under electricity, hot combined stress.
2. the experimental system of electric heating stress inside simulation converter power transformer according to claim 1, which is characterized in that also wrap
Include the supporter (4) for placing thermal-electrical aging tank (3).
3. the experimental system of electric heating stress inside simulation converter power transformer according to claim 1, which is characterized in that electric heating
Several are arranged in ageing can (3), several thermal-electrical aging tanks (3) are provided by power cabinet (2) tests required voltage.
4. the experimental system of electric heating stress inside simulation converter power transformer according to claim 1, which is characterized in that power supply
It is in direct current, 50Hz exchange and 50-1000Hz frequency-changing AC that control cabinet (1), which applies alive mode to board-to-board electrode mechanism,
One or more combination.
5. based on the experimental system of electric heating stress inside simulation converter power transformer described in any one of Claims 1 to 4
Experimental method, which comprises the following steps:
1) insulating board is placed in the vacuum impregnation tank for being loaded with the transformer oil through being dehydrated degassing process, at 80~90 DEG C
Vacuum impregnation processing 12~for 24 hours, it is cooled to room temperature, is made oil immersion cardboard (5)；
2) voltage is applied to oil immersion cardboard (5) by power cabinet (2), while oil immersion cardboard (5) is applied by automatic temperature control device
Experimental temperature in voltage course is adjusted, and completes the thermal-electrical aging experiment under electricity, hot combined stress, obtains the simulation change of current and becomes
Electric, the hot combined stress result that built-in electrical insulation is born in depressor.
6. experimental method according to claim 5, which is characterized in that described through being dehydrated degassing process in step 1)
Transformer oil be transformer oil handles to 12 under conditions of 100pa or less, 60 DEG C~80 DEG C~be made afterwards for 24 hours.
7. experimental method according to claim 5 or 6, which is characterized in that dehydration degassing process after transformer oil it is micro-
Water content≤5ppm, gas content≤0.1%, impurity granularity≤3 μm.
8. experimental method according to claim 5 or 6, which is characterized in that the transformer oil is the Kelamayi 50# transformation
Device oil.
9. experimental method according to claim 5, which is characterized in that the insulating board is using preceding at 90 DEG C~110 DEG C
Under the conditions of 24~48h of drying and processing, moisture content≤0.2% of treated insulating board.
10. experimental method according to claim 5, which is characterized in that the insulating board is Wei Deman insulating board, ruler
Very little is 17cm × 17cm, with a thickness of 1mm.
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Cited By (2)
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| CN111223372A (en) * | 2020-01-16 | 2020-06-02 | 滨州学院 | Flexible direct-current transmission converter valve operation and inspection practical training platform |
| CN113740757A (en) * | 2021-08-20 | 2021-12-03 | 中国电子科技集团公司第四十三研究所 | Metal full-sealed power module immersion type aging system and method |
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Application publication date: 20190621 |