CN106771623A - The test device of insulating materials resistance and resistivity under a kind of hot environment - Google Patents
The test device of insulating materials resistance and resistivity under a kind of hot environment Download PDFInfo
- Publication number
- CN106771623A CN106771623A CN201710039869.0A CN201710039869A CN106771623A CN 106771623 A CN106771623 A CN 106771623A CN 201710039869 A CN201710039869 A CN 201710039869A CN 106771623 A CN106771623 A CN 106771623A
- Authority
- CN
- China
- Prior art keywords
- insulating materials
- test device
- hot environment
- connection terminal
- shield case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 239000011810 insulating material Substances 0.000 title claims abstract description 30
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 38
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000919 ceramic Substances 0.000 claims abstract description 21
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 19
- 239000010431 corundum Substances 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 18
- 239000011148 porous material Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 15
- 230000005611 electricity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000206672 Gelidium Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 108010059642 isinglass Proteins 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000004832 voltammetry Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses the test device of insulating materials resistance and resistivity under a kind of hot environment, including high-temperature electric resistance furnace, the inner shield case that nickel-base alloy is made is provided with high-temperature electric resistance furnace, the top of high-temperature electric resistance furnace is provided with external shield case, connection terminal structure is provided with external shield case；The three electrode modules connection being connected with connection terminal structure is provided with inner shield case；Wherein connection terminal structure is connected with three electrode modules by platinum wire wire, and platinum wire wire is placed in air dielectric；Wherein three electrode modules have the aluminium oxide ceramics matrix of platinum coating for surface；Wherein connection terminal structure is also connected with three coaxial crossing cabin connectors, megger, D.C. regulated power supply.The device can measure resistance and resistivity of the insulating materials under 800 DEG C of hot environments, and can improve its certainty of measurement.
Description
Technical field
The invention belongs to insulating materials technical field of measurement and test, it is related to the test of a kind of insulating materials resistance and resistivity to fill
Put, especially under a kind of hot environment insulating materials resistance and resistivity test device.
Background technology
The resistance and resistivity of insulating materials are respectively one of main unit for electrical property parameters of insulation system and insulating materials.For
The quality of inspection insulating properties, insulation system manufacture and when using, be frequently necessary to determine its insulaion resistance；In insulation material
In the production and application of material, it is often necessary to determine its insulation resistivity.Under normal temperature environment, insulaion resistance and resistivity phase are measured
To being easier, technology also comparative maturity.But with insulating materials and insulation system application field under extreme condition in recent years
Expansion, measurement insulating materials resistivity in extreme circumstances turns into demand.Such as in fire-resisting cable main hot-face insulation
Layer fire-resistant isinglass belt, the high temperature resistant mica products for potroom, the aluminum oxide pottery for making high-temperature crucibles and fire resisting boiler tube
Porcelain etc. these materials, they are required for playing a part of insulation in respective application scenario, so under detecting its high temperature
Resistivity turns into demand.Therefore, measurement insulating materials insulaion resistance in high temperature environments and resistivity have great significance.
The device of existing measurement insulating materials resistance in high temperature environments and resistivity, the insulating barrier of its measure traverse line
It is general all to use the high-temperature insulation material as ceramics, but insulaion resistance can be significantly in high temperature environments for insulating materials
Degree is reduced, and causes the test electric current of test sample inaccurate, causes measurement error.
The content of the invention
It is an object of the invention to provide the test device of insulating materials resistance and resistivity under a kind of hot environment.The dress
The resistance and resistivity that can measure insulating materials under 800 DEG C of hot environments are put, and its certainty of measurement can be improved.
The purpose of the present invention is solved by the following technical programs：
The test device of insulating materials resistance and resistivity under this hot environment, including high-temperature electric resistance furnace, in high-temperature electric resistance furnace
The inner shield case that nickel-base alloy is made is provided with, the top of high-temperature electric resistance furnace is provided with external shield case, is provided with external shield case and connect
Line end minor structure；The three electrode modules connection being connected with connection terminal structure is provided with inner shield case；Its middle connecting terminal knot
Structure is connected with three electrode modules by platinum wire wire, and platinum wire wire is placed in air dielectric；Wherein three electrode modules are
Surface has the aluminium oxide ceramics matrix of platinum coating；Wherein connection terminal structure also with three coaxial crossing cabin connectors, megger,
D.C. regulated power supply is connected.
Further, the features of the present invention is also resided in：
Wherein connection terminal structure includes two ceramic insulation binding posts, and two ceramic insulation binding posts pass through platinum
Spun gold wire is connected with three electrode modules.
Wherein through the hole of high-temperature electric resistance furnace, the pore filling has air dielectric to platinum wire wire.
Wherein the thickness of platinum coating is 5-20 μm.
Wherein three electrode modules are arranged on the corundum base of the bottom of inner shield case 2.
Corundum guide rod is vertically arranged with wherein three electrode modules, corundum guide rod stretches out the outside of high-temperature electric resistance furnace.
Spring pressuring is provided with the corundum guide rod wherein stretched out outside high-temperature electric resistance furnace.
Wherein spring pressuring, connection terminal structure are arranged in external shield case.
Wherein high resistant is calculated as 6517B meggers.
The beneficial effects of the invention are as follows：The platinum wire wire of the present apparatus connects binding post and three electricity by the way of bare wire
Pole module, the characteristic that platinum wire wire has high temperature resistant, conducts electricity very well, and it is air dielectric that it is outside, in hot environment
Air dielectric is more superior relative to other insulating materials insulating properties, therefore, it is possible to farthest avoid the product of Leakage Current
It is raw, improve the accuracy of testing current；The present invention carries out shielding protection using inner shield case to three electrode modules simultaneously, uses
External shield case pair of wire connection terminals structure carries out shielding protection, reduces the shadow of high-temperature electric resistance furnace heating circuit and applied external potential to it
Ring.
Further, the directly contact of three electrode modules and high-temperature electric resistance furnace can be avoided using corundum base, is reduced
Influence of the high temperature circuit to three electrode modules；Corundum guide rod can be compressed three electrode modules simultaneously, reduce three electrode moulds
Gap between block and testing sample, improves the precision of measurement.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of ceramic insulation binding post of the present invention；
Fig. 3 is the structural representation of three electrode module of the invention；
Fig. 4 be the present invention according to 95# aluminium oxide ceramics sample plus 500V DC voltages when the curve drawn of measured data
Figure.
Wherein：1 is high-temperature electric resistance furnace；2 is inner shield case；3 is external shield case；4 is three electrode modules；5 is platinum wire wire；
6 is corundum base；7 is three coaxial crossing cabin connectors；8 is ceramic insulation binding post；9 is megger；10 fill for spring pressurization
Put；11 is corundum guide rod；12 is D.C. regulated power supply；13 is fixed mount；14 is testing sample.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The invention provides the test device of insulating materials resistance and resistivity under a kind of hot environment, as shown in figure 1, bag
High-temperature electric resistance furnace 1 is included, high-temperature electric resistance furnace 1 is internally provided with the inner shield case 2 that nickel-base alloy is made, inner shield case 2 and is provided with corundum
Base 6, is provided with three electrode modules 4 on corundum base 6, as shown in figure 3, three electrode modules 4 have platinum coating for surface
Aluminium oxide ceramics matrix, the thickness of platinum coating is 5-20 μm；The middle setting of three electrode module 4 has testing sample 14；Three electrodes
Module 4 is connected by platinum wire wire 5 with the connection terminal structure for being arranged on the top outer of high-temperature electric resistance furnace 1, and wherein platinum wire is led
Line 5 has 2 or 3, and platinum wire wire 5 is connected on two or three electrodes of three electrode modules 4, and connection terminal structure 5 is wrapped
Ceramic insulation binding post 8 is included, ceramic insulation binding post 8 is correspondingly arranged on 2 or 3；It is air around platinum wire wire 5
Medium, i.e. platinum wire wire 5 are set to the circular hole of 15mm through the position at the top of high-temperature electric resistance furnace 1, and platinum wire wire 5 is arranged on circle
The middle part in hole, and air dielectric is filled with circular hole.
As shown in figure 1, being additionally provided with the corundum guide rod 11 for compressing three electrode modules 4 on three electrode modules 4, corundum is led
Bar 11 connects through the top of high-temperature electric resistance furnace 1, and corundum guide rod 11 with the spring pressuring 10 for being arranged on the top of high-temperature electric resistance furnace 1
Connect, spring pressuring 10 is pushed corundum guide rod 11 by spring, screw rod, and spring can play a part of damping；Such as
Ceramic insulation binding post shown in Fig. 28 is fixed on the top of high-temperature electric resistance furnace 1 by fixed mount 13, and all of ceramic insulation connects
Line terminals 8 and spring pressuring 10 are arranged in external shield case 3, and external shield case 3 tips upside down on the top of high-temperature electric resistance furnace 1, and outward
Shielded box 3 is prepared from for aluminium alloy；Three coaxial crossing cabin connectors 7, three coaxial crossing cabin connectors are additionally provided with external shield case 3
7 are connected with one of ceramic insulation binding post 8, three coaxial crossing cabin connectors 7 also with megger 9 and D.C. regulated power supply 12
It is connected in series, wherein megger 9 is 6517B meggers, D.C. regulated power supply 12 connects with the ceramic insulation binding post 8 of opposite side
Connect.
The application method of test device of the present invention is：Testing sample 14 is arranged in three electrode modules 4, is led by corundum
Be pressed on testing sample 14 in three electrode modules 4 by bar 11, excludes the air gap between the electrode module 4 of testing sample 14 and three, subtracts
Few measurement error；Then it is using platinum wire wire 5 that the ceramics of two or three electrodes of three electrode modules 4 and respective numbers are exhausted
Edge binding post 8 is connected；Megger 9 is set to test resistance, voltage is first not added with, whether observation electric current is zero, is excluded external
The interference of potential；It is then turned off testing electrode, adds DC voltage, whether observation electric current is zero, and removal system leakage current is to surveying
The influence of test result；Then whole test system is connected, starts test.
Specific embodiment of the invention is：
The test of resistance and resistivity is carried out to 95# aluminium oxide ceramics, specimen size is The present invention
The use of the electrode material of three electrode modules 4 is the aluminium oxide ceramics of platinum plating layer gold, electrode size is high-pressure stage
Ring electrode Measurement poleThe measuring method of resistance is voltammetry, experiment electricity
Pressure is respectively 100V, 250V, 500V, and the electrochemical time is 1 minute, and heating mode is 6.1 defined methods in standard IEC 60345
B, i.e. sectional heating method.
Test result as shown in figure 4, under the voltage of 500V, with the rising of test environment temperature, the resistivity of measurement
Value at 800 DEG C, certainty of measurement can reach 1*108, more existing device improves its certainty of measurement.
The measurement result of wherein 100V, 250V, 500V is as shown in the table：
As can be seen from the above table, the measured value of the resistivity under same temperature and different voltages is differed, with
The rising of temperature, remains able to measure the difference of its resistivity in high temperature environments, it can be seen that in the different electricity of different temperatures
Pressure, the device can accurately measure the resistivity of insulating materials；Especially in high temperature environments, its measurement insulating materials electricity
The value of resistance rate is more accurate.
Claims (9)
1. under a kind of hot environment insulating materials resistance and resistivity test device, it is characterised in that including high-temperature electric resistance furnace
(1) the inner shield case (2) that nickel-base alloy is made, is provided with high-temperature electric resistance furnace (1), the top of high-temperature electric resistance furnace (1) is provided with external screen
Cover in case (3), external shield case (3) and be provided with connection terminal structure；It is provided with inner shield case (2) and is connected with connection terminal structure
Three electrode modules (4) connection；
The connection terminal structure is connected with three electrode modules (4) by platinum wire wire (5), and platinum wire wire (5) is placed in
In air dielectric；
Three electrode module (4) has the aluminium oxide ceramics matrix of platinum coating for surface；
The connection terminal structure is also connected with three axis crossing cabins connector (7), megger (9), D.C. regulated power supply (12).
2. under hot environment according to claim 1 insulating materials resistance and resistivity test device, it is characterised in that
The connection terminal structure includes two ceramic insulation binding posts (8), and two ceramic insulation binding posts (8) pass through platinum
Silk wire (5) is connected with three electrode modules (4).
3. under hot environment according to claim 2 insulating materials resistance and resistivity test device, it is characterised in that
Through the hole of high-temperature electric resistance furnace (1), the pore filling has air dielectric to the platinum wire wire (5).
4. under hot environment according to claim 1 insulating materials resistance and resistivity test device, it is characterised in that
The thickness of the platinum coating is 5-20 μm.
5. under hot environment according to claim 1 insulating materials resistance and resistivity test device, it is characterised in that
Three electrode module (4) is arranged on the corundum base (6) of the bottom of inner shield case 2.
6. under hot environment according to claim 1 insulating materials resistance and resistivity test device, it is characterised in that
Corundum guide rod (11) is vertically arranged with three electrode module (4), corundum guide rod (11) stretches out the outside of high-temperature electric resistance furnace (1).
7. under hot environment according to claim 6 insulating materials resistance and resistivity test device, it is characterised in that
Described stretching out on the outside corundum guide rod (11) of high-temperature electric resistance furnace (1) is provided with spring pressuring (10).
8. under hot environment according to claim 7 insulating materials resistance and resistivity test device, it is characterised in that
The spring pressuring (10), connection terminal structure are arranged in external shield case (3).
9. under hot environment according to claim 1 insulating materials resistance and resistivity test device, it is characterised in that
The megger (9) is 6517B meggers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710039869.0A CN106771623B (en) | 2017-01-19 | 2017-01-19 | The test device of insulating materials resistance and resistivity under a kind of hot environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710039869.0A CN106771623B (en) | 2017-01-19 | 2017-01-19 | The test device of insulating materials resistance and resistivity under a kind of hot environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106771623A true CN106771623A (en) | 2017-05-31 |
| CN106771623B CN106771623B (en) | 2019-10-11 |
Family
ID=58944583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710039869.0A Expired - Fee Related CN106771623B (en) | 2017-01-19 | 2017-01-19 | The test device of insulating materials resistance and resistivity under a kind of hot environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106771623B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557344A (en) * | 2018-12-30 | 2019-04-02 | 南瑞集团有限公司 | A kind of high pressure resistant pin configuration |
| CN111443242A (en) * | 2019-01-17 | 2020-07-24 | 西安高压电器研究院有限责任公司 | Auxiliary device for direct-current volume resistivity test of composite insulator core rod |
| CN113406392A (en) * | 2021-06-16 | 2021-09-17 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851485A (en) * | 2006-05-26 | 2006-10-25 | 中国科学院上海硅酸盐研究所 | High temperature resistivity measuring device and its measuring method |
| CN102043094A (en) * | 2010-12-07 | 2011-05-04 | 华北电力大学（保定） | Super-high-temperature high-voltage dust specific resistance measuring device |
| CN203881849U (en) * | 2014-04-08 | 2014-10-15 | 中国人民解放军军械工程学院 | System for measuring surface resistivity of material under high-temperature condition |
| CN204116460U (en) * | 2014-11-05 | 2015-01-21 | 西安交通大学 | A kind of measuring system being applicable to insulating material high field conduction characteristic |
| CN105929240A (en) * | 2016-05-04 | 2016-09-07 | 南京大学 | Resonator apparatus and measurement method for measuring surface intrinsic impedance of high-temperature superconductive film |
| CN106324350A (en) * | 2016-08-31 | 2017-01-11 | 广东技术师范学院 | Device for measuring resistance of powder material |
-
2017
- 2017-01-19 CN CN201710039869.0A patent/CN106771623B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851485A (en) * | 2006-05-26 | 2006-10-25 | 中国科学院上海硅酸盐研究所 | High temperature resistivity measuring device and its measuring method |
| CN102043094A (en) * | 2010-12-07 | 2011-05-04 | 华北电力大学（保定） | Super-high-temperature high-voltage dust specific resistance measuring device |
| CN203881849U (en) * | 2014-04-08 | 2014-10-15 | 中国人民解放军军械工程学院 | System for measuring surface resistivity of material under high-temperature condition |
| CN204116460U (en) * | 2014-11-05 | 2015-01-21 | 西安交通大学 | A kind of measuring system being applicable to insulating material high field conduction characteristic |
| CN105929240A (en) * | 2016-05-04 | 2016-09-07 | 南京大学 | Resonator apparatus and measurement method for measuring surface intrinsic impedance of high-temperature superconductive film |
| CN106324350A (en) * | 2016-08-31 | 2017-01-11 | 广东技术师范学院 | Device for measuring resistance of powder material |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557344A (en) * | 2018-12-30 | 2019-04-02 | 南瑞集团有限公司 | A kind of high pressure resistant pin configuration |
| CN111443242A (en) * | 2019-01-17 | 2020-07-24 | 西安高压电器研究院有限责任公司 | Auxiliary device for direct-current volume resistivity test of composite insulator core rod |
| CN111443242B (en) * | 2019-01-17 | 2022-07-05 | 西安高压电器研究院股份有限公司 | Auxiliary device for direct-current volume resistivity test of composite insulator core rod |
| CN113406392A (en) * | 2021-06-16 | 2021-09-17 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
| CN113406392B (en) * | 2021-06-16 | 2022-05-03 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106771623B (en) | 2019-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103105568B (en) | Aging and the local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating | |
| CN105486927B (en) | A kind of measuring method of solid insulating material specific insulation | |
| CN103267933B (en) | The method of shelf depreciation in measuring transformer induced voltage test device | |
| CN106771623A (en) | The test device of insulating materials resistance and resistivity under a kind of hot environment | |
| CN105911398A (en) | Method for detecting composite insulator interface | |
| CN107632241A (en) | A kind of apparatus and method for testing paper oil insulation partial discharge characteristic | |
| CN103293507B (en) | The online test method of current transformer error | |
| CN107748295A (en) | A kind of device and method of GIS disc insulators dielectric loss test | |
| CN105807189B (en) | The experimental rig and test method of superconducting insulation material shelf depreciation development process | |
| CN103901276B (en) | Measuring equipment and method for detecting conductivity of oilpaper in high-voltage direct-current electric field | |
| CN103399060B (en) | High-temperature and high-pressure reaction kettle electrode and on-line monitoring method with same | |
| CN106404843A (en) | Electrical measurement based four-point type nondestructive test probe with adaptive adjustment | |
| CN110308340B (en) | Direct-current wall bushing fault simulation device and method | |
| CN201181327Y (en) | High voltage standard dielectric loss device | |
| CN106908683A (en) | A kind of multifunctional semiconductor electrical properties device for quick testing and method | |
| CN206788252U (en) | The test device for insulation resistance of ceramic coating under a kind of pressure state | |
| CN105866667A (en) | Loop resistance test method for two-terminal-grounding circuit breaker | |
| CN207516448U (en) | The preferable screening factor test system of communication cable | |
| CN207380185U (en) | A kind of artificial puncture device of electric wire spark machine sensitivity calibrating instrument | |
| CN103143870B (en) | A kind of outer support welding tooling of shielding cylinder connection and using method thereof | |
| CN205404736U (en) | Multilayer ceramic dielectric capacitor nondestructive test device | |
| CN201583598U (en) | High-voltage stator coil insulation dielectric loss test box | |
| CN214895520U (en) | Intermittent type formula cable buffer layer material ablation resistance detection device | |
| Inglis | Frequency dependence of electrode surface effects in parallel-plate capacitors | |
| CN109374978A (en) | A kind of cable dielectric loss improvement measuring circuit and method based on bridge method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191011 |