CN203965384U - Under reverse biased, measure the device that trap parameters is calculated in short-circuit current decay - Google Patents
Under reverse biased, measure the device that trap parameters is calculated in short-circuit current decay Download PDFInfo
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- CN203965384U CN203965384U CN201420518069.9U CN201420518069U CN203965384U CN 203965384 U CN203965384 U CN 203965384U CN 201420518069 U CN201420518069 U CN 201420518069U CN 203965384 U CN203965384 U CN 203965384U
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Abstract
The utility model discloses the device of measuring short-circuit current decay calculating trap parameters under a kind of reverse biased, in comprising, be provided with the vacuum tank of experiment porch, on experiment porch, be disposed with from bottom to up bottom electrode, screen layer, sample to be tested and top electrode, top electrode is connected with DC charging module by switch, between top electrode and bottom electrode, also connect short circuit current measurement system under reverse biased, under reverse biased, short circuit current measurement system comprises by the short circuit of selecting a conducting of selector switch control release free charge circuit and detrapping current measurement circuit, detrapping current measurement circuit comprises detrapping back bias voltage supplies and the microgalvanometer of series connection, the signal output part of microgalvanometer connects computing machine, computer control connects selector switch.The utility model can calculate the trap density that the different energy levels of sample distribute by Isothermal Current attenuation theory, and experimental result is more accurate.
Description
Technical field
The utility model relates to a kind of dielectric substance Trap Characteristics field of measuring technique, relates in particular to the device of measuring short-circuit current decay calculating trap parameters under a kind of reverse biased based on Isothermal Current attenuation theory.
Background technology
Insulating material of polymer has the good dielectric properties such as high such as direct current resistance, dielectric loss is low, good thermal stability and good machining property, thereby be widely used in electric insulation field.But along with the raising of voltage class of electric power system and the development of HVDC Transmission Technology, the space charge effect problem of polymer insulation is outstanding day by day, cause thus the distortion of polymeric material internal electric field, cause shelf depreciation and electric branch development, thereby cause polymeric material problem of aging, how suppressing and eliminating space charge in polymer insulation has become the study hotspot in domestic and international electric insulation field.
At present a lot of about the research of polymkeric substance agine mechaism, wherein more representational is the thermoelectron initiated polymerization thing degraded theory that the people such as Tu Demin of Canadian Gao Guanzhi (Kwan-Chi Kao) and domestic Xi'an Communications University proposes.Under high electric field action, electrons is by during Schottky effect (Schottky effect) or Fowler-Nordheim effect (Fowler-Nordheim effect) are from electrode injection to polymkeric substance, owing to having a large amount of trap states in the energy gap of material forbidden band, the mean free path of electrons is short, is therefore captured by trap very soon and forms space charge.Entering of space charge sunken/recombination process in, in the time that electric charge moves to low-energy state by high-energy state, unnecessary energy is transferred to another electronics by non-radiative form, makes the latter become thermoelectron.The thermoelectron with enough energy will cause molecular degradation and forms a large amount of macromolecular radicals, will further cause free chain reaction, causes the further degraded of polymkeric substance.Thermionic generation and thermionic energy are decided by density and the degree of depth of trap, change trap depth or the density of polymkeric substance, just can change thermionic formation probability and energy.Therefore the injection of space charge, to move, enter sunken/detrapping, the process such as compound and material internal Trap Characteristics closely related, therefore measure and the Trap Characteristics of analysis of material as energy level, density etc., form and the ageing state that suppresses mechanism and polymeric material characterizes and assesses tool and is of great significance for the space charge of material.
Based on above-mentioned analysis, Trap Characteristics affects dielectric and the flash-over characteristic of solid dielectric material very significantly, and may become a kind of solid dielectric material property characterization parameter of more intrinsic, the trap parameters tool of therefore measuring and analyze solid insulating material is of great significance.
The people such as Canadian Xi Mengsi (J.G.Simmons) proposed in the seventies in last century, can be by excited target material the current attenuation characteristic under isothermy obtain the trap parameters of its any energy level.The hot detrapping process of the charge carrier that this theory is captured by trap after based on insulating material excited target under constant temperature, thinks in medium and first discharges in the trap charge carrier of shallow trap, and rear release in deep trap; Hot release current time to time change under constant temperature, this electric current has reflected the regularity of distribution of trap level.Its advantage is without any need for distribution of traps a priori assumption, and the Isothermal Decay electric current of measurement over time relation can directly reflect the distribution of traps of material.
In order to utilize above-mentioned theory analysis, first require experiment electron gain electric current or hole current separately.In the time carrying out measuring short-circuit current decay under bias voltage, the bias polarity that charged media samples is applied can not be just arbitrarily.When apply in the same way bias voltage to open end, positive and negative charge will move in body, and charge carrier transports and will dissipate in body, and this is not wish to occur.Otherwise, apply incorgruous bias voltage if split terminal, positive and negative charge will move to adjacent electrode respectively, thereby shift out medium, CHARGE DISTRIBUTION state can be not destroyed like this, transport and can ignore dissipation to the short distance of adjacent electrode, and sufficiently high bias field also makes the trapization again of ignoring detrapping charge carrier relatively approach actual conditions.Therefore, applying incorgruous bias voltage is to make theoretical analysis can be put to the unique selection of practical application.The selection of executing bias field size outward should ensure enough high to ignore trap again, avoids again that bias voltage is too high causes that electrode injection affects experimental analysis.Therefore generally elect as and be not more than 10
7v/m.
Utility model content
The purpose of this utility model is to provide the device of measuring short-circuit current decay calculating trap parameters under a kind of reverse biased, both be applicable to inorganic insulating material, as the test of the insulating material such as aluminium oxide, processable ceramic trap, also be applicable to the test of insulating material of polymer trap simultaneously, can calculate the trap density that the different energy levels of sample distribute by Isothermal Current attenuation theory, experimental result is more accurate.
The utility model adopts following technical proposals:
Under a kind of reverse biased, measure the device that trap parameters is calculated in short-circuit current decay, comprise the vacuum tank that is provided with chamber door, in vacuum tank, be provided with experiment porch, on experiment porch, be disposed with from bottom to up bottom electrode, screen layer, sample to be tested and top electrode, top electrode is connected with DC charging module by switch, between top electrode and bottom electrode, also connect short circuit current measurement system under reverse biased, under described reverse biased, short circuit current measurement system comprises by the short circuit of selecting a conducting of selector switch control release free charge circuit and detrapping current measurement circuit, detrapping current measurement circuit comprises detrapping back bias voltage supplies and the microgalvanometer of series connection, the signal output part of microgalvanometer connects computing machine, computer control connects selector switch.
Described selector switch adopts magnetic coupling linear actuator, the tache motorice of magnetic coupling linear actuator is connected by wire with top electrode, the release first end of free charge circuit and detrapping current measurement circuit of short circuit is connected respectively two stationary contacts that match with magnetic coupling linear actuator tache motorice, and release the second end of free charge circuit and detrapping current measurement circuit of short circuit is all connected bottom electrode.
Described vacuum tank is vacuum constant-temperature container, and in vacuum tank, bottom electrode below is provided with METAL HEATING PROCESS box, in METAL HEATING PROCESS box, is provided with thermopair.
In described vacuum constant-temperature container, be also provided with quartzy infrared heating pipe and drying agent.
The described short circuit cable adopting in free charge circuit and detrapping current measurement circuit of releasing is coaxial shielded cable.
In the utility model, sample to be tested is positioned in vacuum constant-temperature container, can ensure the stable of experiment condition and electromagnetic screen well, sample to be tested is in the time being applied in reverse bias voltage, positive and negative charge will move to adjacent electrode respectively, thereby shift out medium, CHARGE DISTRIBUTION state can be not destroyed like this, transport and can ignore dissipation to the short distance of adjacent electrode, and sufficiently high bias field also makes the trapization again of ignoring detrapping charge carrier relatively approach actual conditions, the short-circuit current of surveying decay more accurate, convenience of calculation is quick; Sample to be tested one side has screen layer simultaneously, makes the electric charge injecting only for a kind of polarity, dexterously hole trap and electron trap is made a distinction.
Brief description of the drawings
Fig. 1 is structural drawing of the present utility model;
Fig. 2 is the circuit theory schematic diagram of short circuit current measurement system under reverse biased in the utility model.
Embodiment
As shown in Figure 1, under reverse biased described in the utility model, measure short-circuit current decay and calculate the device of trap parameters, comprise the vacuum tank 1 that is provided with chamber door, for ensureing the stable of experiment condition and electromagnetic screen well.In vacuum tank 1, be provided with experiment porch 9, on experiment porch 9, be disposed with from bottom to up bottom electrode 5, screen layer 7, sample to be tested 6 and top electrode 4.Top electrode 4 is connected with DC charging module 3 by K switch 1.The utility model adopts electrode contact mode iunjected charge, can be in iunjected charge under vacuum environment, and between sample to be tested 6 and bottom electrode 5, embed screen layer 7, can effectively suppress the charge injection of bottom electrode 5 to sample to be tested 6, ensureing only has top electrode 4 can inject unipolarity electric charge.By selecting injecting voltage polarity, the utility model can inject electronics or hole to sample upper surface layer respectively, thereby dexterously hole trap and electron trap is distinguished.
As shown in Figure 2, between top electrode 4 and bottom electrode 5, also connect short circuit current measurement system under reverse biased, under described reverse biased, short circuit current measurement system comprises the short circuit of selecting a conducting of being controlled by selector switch K2 release free charge circuit and detrapping current measurement circuit, and short circuit is released free charge circuit at the free charge of measuring removal sample to be tested 6 surfaces before short-circuit current decay; Detrapping current measurement circuit comprises detrapping back bias voltage supplies 11 and the microgalvanometer 12 of series connection, for measuring short-circuit current decay.The signal output part of microgalvanometer 12 connects computing machine 13, computing machine 13 control linkage selector switch K2.
In the utility model, selector switch K2 for realizing the release independent conducting of free charge circuit or detrapping current measurement circuit of short circuit under the control of computing machine 13, in the present embodiment, selector switch K2 can adopt magnetic coupling linear actuator 10, the tache motorice of magnetic coupling linear actuator 10 is connected by wire with top electrode 4, the release first end of free charge circuit and detrapping current measurement circuit of short circuit is connected respectively two stationary contacts that match with magnetic coupling linear actuator 10 tache motorices, release the second end of free charge circuit and detrapping current measurement circuit of short circuit is all connected bottom electrode 5.Under the control of computing machine 13, the tache motorice of magnetic coupling linear actuator 10 can rectilinear motion, in the time that the stationary contact contact that free charge circuit is connected is released in the tache motorice of magnetic coupling linear actuator 10 and short circuit, the short circuit free charge circuit turn-on of releasing, detrapping current measurement circuit disconnects; Be connected with detrapping current measurement circuit when the tache motorice of magnetic coupling linear actuator 10 stationary contact contact time, the conducting of detrapping current measurement circuit, the short circuit free charge circuit of releasing disconnects.Adopt magnetic coupling linear actuator 10 as selector switch K2, have and be convenient to control, regulate precisely and shake the advantages such as little.
Because the isothermal short-circuit current decay recording under constant temperature can improve the degree of accuracy of experimental result, in the utility model, vacuum tank 1 is vacuum constant-temperature container, and in vacuum constant-temperature container, bottom electrode 5 belows are provided with METAL HEATING PROCESS box 8, in METAL HEATING PROCESS box 8, are provided with thermopair.METAL HEATING PROCESS box 8 heats for treating test article, reaches design temperature and keeps constant to realize in measuring process.In the present embodiment, in order further to ensure the constant temperature effect in vacuum constant-temperature container to be also provided with quartzy infrared heating pipe in vacuum constant-temperature container; Quartz infrared heating pipe and thermopair have formed heating arrangement jointly, can under the control of computing machine 13, realize the temperature incubation function in vacuum constant-temperature container.In the utility model, in vacuum constant-temperature container, be also provided with drying agent, for realizing the humidity control in vacuum constant-temperature container.In the utility model, the short circuit cable adopting in free charge circuit and detrapping current measurement circuit of releasing is coaxial shielded cable, can coordinate vacuum constant-temperature container to ensure good effectiveness, has improved measurement result accuracy.
Described in the utility model utilization under reverse biased measured the method that short-circuit current decay calculating trap parameters device is measured, and comprises the following steps:
A: open vacuum constant-temperature container chamber door, sample to be tested 6 is placed between top electrode 4 and screen layer 7, ensure the surface of contact cleaning of sample to be tested 6 and top electrode 4, then close vacuum constant temperature chamber door;
B: utilize heating box to carry out preheating to sample to be tested 6, then utilize DC charging module 3 to apply DC charging voltage to top electrode 4, to sample to be tested 6 iunjected charges; After iunjected charge, stop top electrode 4 to apply DC charging voltage; In order to ensure test product each several part temperature equalization, heating box is to sample to be tested 6 preheating 20min-30min at the temperature of 50 DEG C-60 DEG C.When to sample to be tested 6 iunjected charge, injection field intensity is 40kV/mm, injection length 30min, and 50 DEG C of implantation temperatures, can reach the effect that makes electric charge fully inject sample;
C: utilize computing machine 13 to control selector switch K2, by the short circuit free charge circuit turn-on of releasing, remove the free charge on sample to be tested 6 surfaces by the short circuit free charge circuit of releasing, to avoid existing of free charge to exert an influence to the numerical value of short circuit decay current;
D: utilize computing machine 13 to control selector switch K2, disconnect the short circuit free charge circuit of releasing, by the conducting of detrapping current measurement circuit, make sample to be tested 6, microgalvanometer 12 and detrapping back bias voltage supplies 11 form the series circuit of conducting, utilize microgalvanometer 12 measure the decay of isothermal short-circuit current and sample and record by computing machine 13, then utilize the isothermal short-circuit current decay recording, calculate by Isothermal Current attenuation theory the trap density that the different energy levels of sample distribute, computing method are: suppose the no longer trap of charge carrier that heat discharges, trap level E
tand Isothermal Current density J and trap density N
tpass be:
Wherein E
tfor trap level, k is Boltzmann constant, and T is absolute temperature, and γ is electronic vibration frequency, and t is the time; J is Isothermal Current density, and q is electron charge, the thickness that d is sample, f
0(E) be the initial occupation rate of trap, N
t(E
t) be trap energy distribution function; The energy of electron trap is to calculate as zero point at the bottom of conduction band, and the energy of hole trap calculates taking top of valence band as zero point.
Compared with prior art, the utlity model has following beneficial effect:
1, the attenuation measurement of isothermal short-circuit current is more accurate, and convenience of calculation is quick.The utility model in use, sample to be tested 6 is applied in reverse bias voltage in vacuum constant-temperature container, positive and negative charge will move to heteropolarity electrode respectively, reach and will be filled with that electric charge shifts out from medium and the object that can not destroy electric charge original distribution state, the charge dissipation that transports generation to the short distance of heteropolarity electrode is very faint, under high bias field, the trapization again of detrapping charge carrier is negligible simultaneously, this meets Isothermal Current attenuation theory model and actual conditions, these conditions have ensured accuracy and the practicality of the utility model in the time calculating distribution of traps parameter.。
2, the utility model is by measuring isothermal short-circuit current under reverse bias voltage condition and decay to calculate distribution of traps, apply sufficiently high reverse bias electric field the probability of trap again that can reduce detrapping charge carrier applying.The utility model is applicable to the measurement of (tens μ m～number mm) test product in larger thickness range more, can provide a kind of effectively analysis means for Solid Dielectric Surface electrification phenomenon and to the research of the aspects such as edge flashing performance impact.
3, in the utility model, adopt electrode contact mode iunjected charge, can under vacuum environment, inject positive and negative charge to medium, there is the voltage of applying high, and can not there is the advantage of edge flashing, measuring vacuum cavity has good effectiveness for measuring low current signal simultaneously,, ensured the accuracy of experimental result.
4, the utility model embeds screen layer 7 between sample to be tested 6 and bottom electrode 5, can effectively suppress bottom electrode 5 to sample to be tested 6 iunjected charges, and ensureing only has top electrode 4 to inject unipolarity electric charge; By selecting applied voltage polarity, can inject electronics or hole to sample to be tested 6 upper epidermis, thereby realize dexterously, hole trap and electron trap are distinguished.Charge injection and the attenuation measurement of isothermal short-circuit current are all carried out in vacuum constant-temperature container, and all measurement cables are all coaxial shielded cables, have improved measurement result accuracy.
Claims (5)
1. under reverse biased, measure the device that trap parameters is calculated in short-circuit current decay, it is characterized in that: comprise the vacuum tank that is provided with chamber door, in vacuum tank, be provided with experiment porch, on experiment porch, be disposed with from bottom to up bottom electrode, screen layer, sample to be tested and top electrode, top electrode is connected with DC charging module by switch, between top electrode and bottom electrode, also connect short circuit current measurement system under reverse biased, under described reverse biased, short circuit current measurement system comprises by the short circuit of selecting a conducting of selector switch control release free charge circuit and detrapping current measurement circuit, detrapping current measurement circuit comprises detrapping back bias voltage supplies and the microgalvanometer of series connection, the signal output part of microgalvanometer connects computing machine, computer control connects selector switch.
2. under reverse biased according to claim 1, measure the device that trap parameters is calculated in short-circuit current decay, it is characterized in that: described selector switch adopts magnetic coupling linear actuator, the tache motorice of magnetic coupling linear actuator is connected by wire with top electrode, the release first end of free charge circuit and detrapping current measurement circuit of short circuit is connected respectively two stationary contacts that match with magnetic coupling linear actuator tache motorice, and release the second end of free charge circuit and detrapping current measurement circuit of short circuit is all connected bottom electrode.
3. under reverse biased according to claim 2, measure the device that trap parameters is calculated in short-circuit current decay, it is characterized in that: described vacuum tank is vacuum constant-temperature container, in vacuum tank, bottom electrode below is provided with METAL HEATING PROCESS box, in METAL HEATING PROCESS box, is provided with thermopair.
4. under reverse biased according to claim 3, measure the device that trap parameters is calculated in short-circuit current decay, it is characterized in that: in described vacuum constant-temperature container, be also provided with quartzy infrared heating pipe and drying agent.
5. under reverse biased according to claim 4, measure the device that trap parameters is calculated in short-circuit current decay, it is characterized in that: the described short circuit cable adopting in free charge circuit and detrapping current measurement circuit of releasing is coaxial shielded cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420518069.9U CN203965384U (en) | 2014-09-10 | 2014-09-10 | Under reverse biased, measure the device that trap parameters is calculated in short-circuit current decay |
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| CN201420518069.9U CN203965384U (en) | 2014-09-10 | 2014-09-10 | Under reverse biased, measure the device that trap parameters is calculated in short-circuit current decay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198570A (en) * | 2014-09-10 | 2014-12-10 | 国家电网公司 | Device and method for calculating trap parameters by measuring attenuation of short-circuit current under reverse bias |
-
2014
- 2014-09-10 CN CN201420518069.9U patent/CN203965384U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198570A (en) * | 2014-09-10 | 2014-12-10 | 国家电网公司 | Device and method for calculating trap parameters by measuring attenuation of short-circuit current under reverse bias |
| CN104198570B (en) * | 2014-09-10 | 2016-08-17 | 国家电网公司 | The apparatus and method of short circuit current decay calculation trap parameters are measured under reverse biased |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20141126 Effective date of abandoning: 20160817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |