CN206618811U - Electrode system for the following solid dielectric space charge measurement of zero degrees celsius - Google Patents
Electrode system for the following solid dielectric space charge measurement of zero degrees celsius Download PDFInfo
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- CN206618811U CN206618811U CN201720322568.4U CN201720322568U CN206618811U CN 206618811 U CN206618811 U CN 206618811U CN 201720322568 U CN201720322568 U CN 201720322568U CN 206618811 U CN206618811 U CN 206618811U
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- piezoelectric transducer
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Abstract
A kind of electrode system for the following solid dielectric space charge measurement of zero degrees celsius, including：Top electrode device, lower electrode device and the peripheral device being attached thereto respectively, Top electrode device include：The Top electrode of low temperature resistant O-ring, outer metal cap, the semiconductive piece being arranged in metal cap and upper cylinder lower disc structure；Lower electrode device includes：Thermocouple, broadband amplifiers, bottom electrode plate, the liquid nitrogen circular passage being opened in below bottom electrode plate, piezoelectric transducer and Electrothermal ring in loop configuration；Peripheral device includes：Vavuum pump, Dewar container for liquefied nitrogen tank and temperature controller；The utility model overcomes the related problem in the space charge measurement of the following solid dielectric of zero degrees celsius using vacuum cavity and the piezoelectric transducer of resistance to sub-zero temperature, reliable and stable, and accuracy is high.
Description
Technical field
The utility model relates to a kind of technology of medium physics fields of measurement, be specifically it is a kind of be used for zero degrees celsius with
The electrode system of lower solid dielectric space charge measurement.
Background technology
Solid dielectric material is widely used in the field such as power system industry and space flight and aviation, such as polymer
Insulated cable is due to portable construction, and the electric power that the advantage such as running temperature is high and environment-friendly is widely used in ac and dc systemses is passed
It is defeated.But, polymer is very easy to accumulation space electric charge in high voltage direct current off field, so that electric field distortion is caused, along with
The problems such as thermionic emission and electromechanical can store and discharge can accelerate insulation degradation, and its service life is greatly decreased.Therefore it is solid
Normally operation is always vital for ensureing equipment for the space charge measurement of body medium.Secondly, by space plasma,
High energy electron and solar radiation etc. influence, and solid dielectric can accumulate certain space charge on spacecraft surface, so as to cause table
Face static discharge phenomenon.Static discharge can cause the puncturing of spacecraft surfacing, the decline of solar array performance, and it is produced
Raw electromagnetic pulse interference can make sensitive electronic equipment maloperation or damage occur.And temperature change is violent in space, one day
The middle most of the time is in -270 DEG C of cosmic background radiation.As a large amount of dielectric materials are in spaceborne extensive use, boat
The probability that its device breaks down by material surface charged effect is in rising trend, therefore the space under extremely low temperature to medium
Electric charge is measured to play an important roll to China's aviation development.Thirdly, with the development of high temperature superconductor technology, superconduction
DC transmission system is probably the emphasis direction of advance of following high efficiency transmission of electricity, and the space of polymer insulation is electric under superconducting temperature
Lotus characteristic also determine the operational reliability of system.
And space charge measuring technology mainly covers the measurement range of normal temperature to 90 DEG C now, the following solid of zero degrees celsius is situated between
The space charge measurement of matter seldom sees report, and without the measurement apparatus of stable shaping, this is for the sky under above-mentioned condition
Between charge characteristic research cause suitable difficulty.The e measurement technology of the following space charge of zero degrees celsius needs to overcome many difficulties
Topic, such as condensed water may cause the flashover of specimen surface, the temperature tolerance of piezoelectric transducer and the control of temperature etc..Cause
The development of the measurement apparatus of the following space charge of this zero degrees celsius has particularly important meaning for the studies above field.
Utility model content
The utility model is for using constant temperature circulating bath control temperature, complicated, accuracy of temperature control is relatively low more than prior art；
And circulate the medium that uses of bath and be generally water or oil, effective temperature control range is more than zero degrees celsius, it is impossible to formed
Low temperature environment below zero degrees celsius；Its electrode is directly contacted with air, and when test temperature is below zero degrees celsius, electrode is filled
The edge flashing of tested insulating materials sample in putting will be inevitable, will be unable to be normally carried out measurement of space charge etc. to lack
Fall into, a kind of electrode system for the following solid dielectric space charge measurement of zero degrees celsius is proposed, using vacuum cavity technology, liquid
Nitrogen and Electrothermal ring containing temperature control, and the piezoelectric transducer of resistance to extremely low temperature carry out space charge measurement, reliable and stable.
The utility model is achieved through the following technical solutions：
The utility model includes：Top electrode device, lower electrode device and the peripheral device being attached thereto respectively, its
In：Top electrode device produces space charge by additional DC high-voltage source, and clock produces ping, and is filled by bottom electrode
Put the measurement for carrying out space charge；Peripheral device is that Top electrode device and lower electrode device provide measuring environment.
Described measuring environment refers to：Top electrode device and lower electrode device are collectively forming the airtight cavity of inner vacuum,
Steady temperature in cavity below zero degrees celsius.
Described Top electrode device includes：Low temperature resistant O-ring, outer metal cap, the Top electrode being arranged in metal cap and half
Conducting strip, wherein：Base of the low temperature resistant O-ring along outer metal cap is set, the lower surface of Top electrode and the upper surface of semiconductive piece
It is in close contact.
Described Top electrode is upper cylinder lower disc structure.
Described cylinder stretches out outer metal cap and is connected with additional clock and DC high-voltage source.
Provided with the Top electrode insulating disc being engaged between the described inside top of outer metal cap and the extension of cylinder.
The side of described outer metal cap is provided with vacuum exhaust pipe.
Described lower electrode device includes：Thermocouple, broadband amplifiers, bottom electrode plate, it is opened in below bottom electrode plate
Liquid nitrogen circular passage, piezoelectric transducer and Electrothermal ring in loop configuration, wherein：Piezoelectric transducer is close to bottom electrode plate
Lower surface, broadband amplifiers is connected with piezoelectric transducer；Thermocouple is embedded in above bottom electrode plate, and Electrothermal ring is around piezoelectricity
Sensor is set, and is separated with piezoelectric transducer by the extension of bottom electrode plate.
Described liquid nitrogen circular passage is exported provided with liquid nitrogen entrance and liquid nitrogen.
Described low temperature resistant O-ring is in close contact with bottom electrode plate.
Sample is placed in described outer metal cap, upper surface and the semiconductive piece of sample are in close contact, lower surface and lower electricity
The upper surface of pole plate is in close contact.
Described piezoelectric transducer is located at the underface of sample.
Described peripheral device includes：Vavuum pump, Dewar container for liquefied nitrogen tank and temperature controller.
Described vavuum pump is connected with vacuum exhaust pipe.
Described Dewar container for liquefied nitrogen tank is connected with liquid nitrogen entrance.
Described temperature controller is connected with setting with bottom electrode plate and just to the temperature thermocouple of sample.
Technique effect
Compared with prior art, the utility model uses vacuum cavity technology, liquid nitrogen and Electrothermal ring containing temperature control, and
Piezoelectric transducer below resistance to zero degrees celsius, realizes the space charge measurement of the following solid dielectric of zero degrees celsius, overcomes condensation
The flashover and temperature controlled technical problem of specimen surface, are provided for low temperature space electric charge testing field caused by water is possible
Technical support.
Brief description of the drawings
Fig. 1 is measurement apparatus structural representation；
Fig. 2 be embodiment 1 apply 10 respectively at -40 DEG C, 20,30,40, the space charge after 50kV/mm DC electric fields
Distribution schematic diagram；
In figure：1 it is outer metal cap, 2 be Top electrode insulating disc, 3 be Top electrode, 4 be semiconductive piece, 5 be sample, 6 is resistance to
Low temperature O-ring, 7 be vacuum exhaust pipe, 8 be bottom electrode plate, 9 be liquid nitrogen circular passage, 10 be Electrothermal ring, 11 be piezoelectric sensing
Device, 12 be broadband amplifiers, 13 be liquid nitrogen entrance, 14 be liquid nitrogen outlet, 15 be temperature thermocouple, 16 be vavuum pump, 17 be liquid
Nitrogen Dewar tank, 18 are temperature controller.
Embodiment
As shown in figure 1, the present embodiment includes：Top electrode device, lower electrode device and the periphery being attached thereto respectively are set
Standby device, wherein：Top electrode device produces space charge by additional clock and DC high-voltage source, and is filled by bottom electrode
Put the measurement for carrying out space charge；Peripheral device is that Top electrode device and lower electrode device provide measuring environment.
Described measuring environment refers to：Top electrode device and lower electrode device are collectively forming the airtight cavity of inner vacuum,
Steady temperature in cavity below zero degrees celsius.
Described Top electrode device includes：Low temperature resistant O-ring 6, outer metal cap 1, the and of Top electrode 3 being arranged in metal cap
Semiconductive piece 4, wherein：Base of the low temperature resistant O-ring 6 along outer metal cap 1 is set, lower surface and the semiconductive piece 4 of Top electrode 3
Upper surface is in close contact.
Described Top electrode 3 is upper cylinder lower disc structure.
Described cylinder stretches out outer metal cap 1 and is connected with additional clock and DC high-voltage source.
Provided with the Top electrode insulating disc being engaged between the described inside top of outer metal cap 1 and the extension of cylinder
2。
The side of described outer metal cap 1 is provided with vacuum exhaust pipe 7.
Described lower electrode device includes：Thermocouple, broadband amplifiers 12, bottom electrode plate 8, it is opened under bottom electrode plate 8
The liquid nitrogen circular passage 9 of side, piezoelectric transducer 11 and Electrothermal ring 10 in loop configuration, wherein：Piezoelectric transducer 11
It is close to the lower surface of bottom electrode plate 8, broadband amplifiers 12 is connected with piezoelectric transducer 11 by coaxial signal line, amplification piezoelectricity is passed
Faint space charge signal that sensor 11 is transmitted simultaneously is exported；Thermocouple is embedded in the top of bottom electrode plate 8, and Electrothermal ring 10 is surround
Piezoelectric transducer 11 is set, and is separated with piezoelectric transducer 11 by the extension of bottom electrode plate 8.
Described liquid nitrogen circular passage 9 is provided with liquid nitrogen entrance 13 and liquid nitrogen outlet 14.
Described low temperature resistant O-ring 6 is in close contact with bottom electrode plate 8.
Sample 5 is placed in described outer metal cap 1, upper surface and the semiconductive piece 4 of sample 5 are in close contact, lower surface and
The upper surface of bottom electrode plate 8 is in close contact.
Described piezoelectric transducer 11 is located at the underface of sample 5.
Described peripheral device includes：Vavuum pump 16, Dewar container for liquefied nitrogen tank 17 and temperature controller 18.
Described vavuum pump 16 is connected with vacuum exhaust pipe 7.
Described Dewar container for liquefied nitrogen tank 17 has to be connected from function of increasing pressure, and with liquid nitrogen entrance 13.
Described temperature controller 18 is connected with setting with bottom electrode plate and just to the temperature thermocouple 15 of sample, with reality
When monitor sample 5 temperature.
The material of described outer metal cap 1 is stainless steel.
Described Top electrode 3 and the material of bottom electrode plate 8 are aluminium.
The material of described Top electrode insulating disc 2 is polytetrafluoroethylene (PTFE).
The material of described piezoelectric transducer 11 is lithium columbate crystal, is resistant to sub-zero temperature.
Described Top electrode device uses vacuum cavity, it is to avoid the generation of the dielectric surface flashover of sample 5, and by high direct voltage and arteries and veins
Impulse, which is encouraged, to be coupled on sample 5.
Described sample 5 is in close contact with bottom electrode plate 8, ensure that vibration acoustic caused by space charge can be transmitted
To piezoelectric transducer 11.
Described lower electrode device is resistant to sub-zero temperature, and add using liquid nitrogen and electricity using lithium niobate piezoelectric sensor 11
The phase containing of gas ket 10 is with the temperature of Control Assay 5.
Described vavuum pump 16 extracts air in outer metal cap 1 out by vacuum exhaust pipe 7, and outer metal cap 1 passes through low temperature resistant O
Type circle 6 ensures sealing, constructs the vacuum state in outer metal cap 1 and prevents gas leakage, it is to avoid the hair of edge flashing near sample 5
It is raw.
During work, the present embodiment comprises the following steps：
Step 1, sample 5 and outer metal cap 1 are sequentially placed, applying pressure by fastening screw makes sample 5 and bottom electrode plate 8
It is in close contact；Start vavuum pump 16, wait 3min so that the inside of outer metal cap 1 is substantially at vacuum state.
Described sample 5 is commercial low density polyethylene (LDPE) (LDPE) film, and thickness is 300 μm.
Step 2, opening Dewar container for liquefied nitrogen tank 17 and temperature controller 18, are -40 DEG C by the temperature setting of temperature controller 18,
Dewar container for liquefied nitrogen tank 17 and the collective effect of Electrothermal ring 10, make the temperature of sample 5 gradually stablize from room temperature at -40 DEG C, and wait
3min makes the temperature of sample 5 thoroughly stablize.
Described collective effect refers to：Dewar container for liquefied nitrogen tank 17 injects liquid by liquid nitrogen entrance 13 into liquid nitrogen circular passage 9
Nitrogen cools to sample 5, is then flowed out from liquid nitrogen outlet 14；Electrothermal ring 10 is powered to the heat temperature raising of sample 5.
Step 3, connection broadband amplifiers 12, open additional pulse source forcing, set the defeated of additional DC high-voltage source
Go out to be followed successively by 3000V, 6000V, 9000V, 12000V and 15000V, each collection space charge waveform 10min, as a result such as Fig. 2 institutes
Show.
Figure it is seen that with the ripple for applying the left half of negative electrical charge for representing negative electrode sensing in alive raising, figure
Paddy and the right half of crest for representing the positive charge that positive electrode is induced increase, and the position of crest, trough is not substantially moved
It is dynamic, show that measurement is stable；There is negative polarity space charge accumulation inside sample 5 simultaneously, and the amount accumulated is alive with applying
Raise and increase, meet the expection of theory, show the accuracy of measurement；The minimum temperature that the present embodiment can be detected accurately is -196
℃。
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the utility model principle and objective with
Different modes carries out local directed complete set to it, and protection domain of the present utility model is defined by claims and not by above-mentioned specific
Implementation is limited, and each implementation in the range of it is by the constraint of the utility model.
Claims (8)
1. a kind of electrode system for the following solid dielectric space charge measurement of zero degrees celsius, it is characterised in that including：Upper electricity
Pole device, lower electrode device and the peripheral device being attached thereto respectively, wherein：Top electrode device includes：It is low temperature resistant O-shaped
Circle, outer metal cap, the Top electrode of the semiconductive piece being arranged in metal cap and upper cylinder lower disc structure；Lower electrode device bag
Include：Thermocouple, broadband amplifiers, bottom electrode plate, the liquid nitrogen circular passage being opened in below bottom electrode plate, in loop configuration
Piezoelectric transducer and Electrothermal ring；Peripheral device includes：Vavuum pump, Dewar container for liquefied nitrogen tank and temperature controller.
2. electrode system according to claim 1, it is characterized in that, the base of described low temperature resistant O-ring along outer metal cap
Set, the lower surface of Top electrode is in close contact with the upper surface of semiconductive piece.
3. electrode system according to claim 1, it is characterized in that, described piezoelectric transducer is close to the following table of bottom electrode plate
Face, broadband amplifiers is connected with piezoelectric transducer.
4. electrode system according to claim 1, it is characterized in that, described thermocouple is embedded in above bottom electrode plate, electricity
Heating collar is set around piezoelectric transducer, and is separated with piezoelectric transducer by the extension of bottom electrode plate.
5. electrode system according to claim 1, it is characterized in that, the inside top and circle of described described outer metal cap
Provided with the Top electrode insulating disc being engaged between the extension of post.
6. electrode system according to claim 1, it is characterized in that, described low temperature resistant O-ring closely connects with bottom electrode plate
Touch.
7. electrode system according to claim 1, it is characterized in that, place sample in described outer metal cap, sample it is upper
Surface is in close contact with semiconductive piece, and the upper surface of lower surface and bottom electrode plate is in close contact.
8. electrode system according to claim 1, it is characterized in that, on described temperature controller and setting and bottom electrode plate
And just the temperature thermocouple of sample is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720322568.4U CN206618811U (en) | 2017-03-29 | 2017-03-29 | Electrode system for the following solid dielectric space charge measurement of zero degrees celsius |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720322568.4U CN206618811U (en) | 2017-03-29 | 2017-03-29 | Electrode system for the following solid dielectric space charge measurement of zero degrees celsius |
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| Publication Number | Publication Date |
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| CN206618811U true CN206618811U (en) | 2017-11-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918977A (en) * | 2018-05-02 | 2018-11-30 | 沈阳工业大学 | Dielectric gas-solid interface flashover property measuring device and method under a kind of cryogenic conditions |
-
2017
- 2017-03-29 CN CN201720322568.4U patent/CN206618811U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918977A (en) * | 2018-05-02 | 2018-11-30 | 沈阳工业大学 | Dielectric gas-solid interface flashover property measuring device and method under a kind of cryogenic conditions |
| CN108918977B (en) * | 2018-05-02 | 2024-02-06 | 沈阳工业大学 | Device and method for measuring dielectric gas-solid interface flashover characteristic under low temperature condition |
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