CN206740864U - A kind of insulating materials time-frequency domain dielectric spectra measuring electrode system - Google Patents
A kind of insulating materials time-frequency domain dielectric spectra measuring electrode system Download PDFInfo
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- CN206740864U CN206740864U CN201720585341.9U CN201720585341U CN206740864U CN 206740864 U CN206740864 U CN 206740864U CN 201720585341 U CN201720585341 U CN 201720585341U CN 206740864 U CN206740864 U CN 206740864U
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Abstract
The utility model provides a kind of insulating materials time-frequency domain dielectric spectra measuring electrode system, including measuring electrode device, voltage generation circuit, measuring circuit overcurrent protection, time-frequency domain dielectric spectra measurement apparatus, temperature control equipment, electromagnetic screen and measuring and controlling；This measuring electrode system has good EMI shielding capability, can realize accurate measurement under the conditions of high temperature and high field intensity.
Description
Technical field
The utility model belongs to Measuring Technology of Electrical Insulation field, and more particularly to a kind of insulating materials time-frequency domain dielectric spectra is surveyed
Measure electrode system.
Background technology
Insulating materials applies the conductance of the time-frequency domain dielectric response spectrum reflection dielectric material under direct current, alternating voltage, pole outside
Change, loss characteristic and medium Space-charge accumulation situation, therefrom can analysis of material microstructure, insulation defect and aging shape
State, it is a kind of lossless Dielectric measuring analysis method.
Actual work temperature and electric field of the insulating material in power equipment change with different load conditions, volume
Determine operating temperature and electric field is higher, therefore the Dielectric measuring of insulating materials test product also should be at different temperature and current field condition
Carry out, with the practical application condition as close possible to material.In addition, the time-frequency domain dielectric spectra and temperature, electricity of research insulating materials
The relation of field also has most important theories meaning.
At present, Time Domain Dielectric Spectroscopy measurement typically realizes that the electrode case shield effectiveness is good using commercial measuring electrode case, peace
Full performance is higher, but can only be used cooperatively with the electrometer of built-in 1kV dc sources, and the measurement of higher voltage (electric field) is limited
System；In addition the electrode case should not also use at relatively high temperatures.
The laboratory measurement of dielectric spectroscopy, such as now widely used wideband broadband dielectric spectrometer, using supporting
Electrode special system is realized.Other commercial dielectric spectrometers then need to make suitable electrode system by oneself to realize measurement.Also, in order to right
According to time domain and dielectric spectroscopy measurement result, the two should use same measuring electrode system.
Time-frequency domain dielectric spectrometry particularly Time Domain Dielectric Spectroscopy measures, and because measurement current signal is minimum, is easily measured
In system in stray capacitance, leakage current and measuring environment electromagnetic signal interference, cause measurement result inaccurate or measurement be steady
It is qualitative poor.Therefore, the electrode system that time-frequency domain dielectric spectrometry uses need to have good EMI shielding capability, ensure
Measurement result is true and reliable.
Utility model content
The purpose of this utility model is to provide a kind of insulating materials time-frequency domain dielectric spectra measuring electrode system, in not same electric field
Higher measurement accuracy can be reached under intensity and different temperatures, there is good measurement stability.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows：
A kind of insulating materials time-frequency domain dielectric spectra measuring electrode system, including：
Measuring electrode device, voltage generation circuit, measuring circuit overcurrent protection, time-frequency domain dielectric spectrometry dress
Put, temperature control equipment, electromagnetic screen and measuring and controlling, wherein, the high voltage input terminal of the measuring electrode device
It is connected with the voltage generation circuit, the signal output part of the measuring electrode device fills through the measuring circuit overcurrent protection
Put and be connected with the time-frequency domain dielectric spectra measurement apparatus, form measuring circuit；The temperature control equipment is placed in the measurement electricity
Outside the device of pole；The electromagnetic screen is used to reduce the external electromagnetic signal interference in time-frequency domain dielectric spectra measurement process；
The measuring and controlling is used to control by the measuring electrode device, measuring circuit overcurrent protection and time-frequency domain dielectric
The measuring circuit that spectrometry device is formed.
Preferably, the measuring electrode device includes：
High-field electrode, for applying combined-voltage in measurement；
Measuring electrode, measurement signal is produced during for measuring；
Guard electrode, for avoiding the influence of test product surface Leakage Current in measurement；
Measurement signal output end, exported for measurement signal；
Guard electrode terminals, it is grounded for guard electrode；
Spring compacting device, for ensureing the insulating materials flat board test product and high-field electrode and measuring electrode table of different-thickness
The close good contact in face；
Support column, for supporting upper and lower bottom plate and keeping insulating with electromagnetic screen.
Preferably, the measuring circuit overcurrent protection includes：
Resistor, diode and shielding box, wherein, the shielding box is used to provide for the resistor and the diode
Lucifuge sealing condition.
Preferably, the electromagnetic screen includes：
Metal-back, upper insulating sleeve and lower insulating sleeve, hinge.
It is furthermore preferred that the high-field electrode, measuring electrode and guard electrode use brass as material, chrome-faced.
It is furthermore preferred that the upper and lower bottom plate and support column use teflon.
It is furthermore preferred that the metal-back uses aluminium or copper.
Brief description of the drawings
Fig. 1 is the structural representation of insulating materials time-frequency domain dielectric spectra measuring electrode system in the utility model；
1 is measuring electrode device, and 2 be voltage generation circuit, and 3 be measuring circuit overcurrent protection, and 4 be that time-frequency domain is situated between
Electric spectrometry device, 5 be temperature control equipment, and 6 be electromagnetic screen, and 7 be measuring and controlling；
Fig. 2 is time-frequency domain measuring electrode schematic device in the utility model；
Wherein, 2-1 is high-field electrode, and 2-2 is measuring electrode, and 2-3 is guard electrode, and 2-4 is high-voltage terminal, and 2-5 is
Measurement signal output end, 2-6 are guard electrode terminals, and 2-7 is spring compacting device, and 2-8 is upper and lower bottom plate, and 2-9 is support
Post, 2-10 are insulating materials test products, and 2-11 is voltage equalizing ball；
Fig. 3 is measuring circuit overcurrent protection schematic diagram in the utility model；
3-1 is current-limiting resistor, and 3-2 is diode, and 3-3 is shielding box；
Fig. 4 is electromagnetic screen schematic diagram in the utility model；
4-1 is metal-back, and 4-2 is upper insulating sleeve, and 4-3 is lower insulating sleeve, and 4-4 is lateral opening hole, and 4-5 is hinge,
4-6 is door lock, and 4-7 is earth terminal.
Embodiment
Refering to Fig. 1, the utility model embodiment provides a kind of insulating materials time-frequency domain dielectric spectra measuring electrode system, bag
Include：
Measuring electrode device, the high voltage input terminal of the measuring electrode device are connected with voltage generation circuit, output end warp
Measuring circuit overcurrent protection is connected with time-frequency domain dielectric spectra measurement apparatus forms measuring circuit；
Temperature control equipment, it is placed in outside the measuring electrode device；
Electromagnetic screen, for reducing the external electromagnetic signal interference in time-frequency domain dielectric spectra measurement process；
Measuring and controlling, for controlling by the measuring electrode device, voltage generation circuit, time-frequency domain dielectric spectrometry
The measuring circuit of device composition, completes time-frequency domain dielectric spectrometry.
Refering to Fig. 2, time-frequency domain measuring electrode device includes in the utility model embodiment：
High-field electrode, it is discoid chrome-faced brass electrode for applying combined-voltage in measurement；
Measuring electrode, measurement signal is produced during for measuring, being discoid chrome-faced brass electrode；
Guard electrode, it is circular chrome-faced brass electricity for avoiding the influence of test product surface Leakage Current in measurement
Pole；
It is used to place insulating materials test product between high-field electrode and measuring electrode, guard electrode；
High-field electrode, the size of measuring electrode and guard electrode and the gap size of measuring electrode and guard electrode can join
According to the relevant regulations of national standard acceptance of the bid collimator electrode, the present embodiment mesohigh electrode diameter is 74mm, a diameter of 50mm of measuring electrode, is protected
Shield electrode external diameter is 74mm, and the gap of measuring electrode and guard electrode is 2mm；High-field electrode and measuring electrode, guard electrode table
Flat smooth is answered in face, and chromium plating process can avoid brass from aoxidizing, and edge should make chamfering, prevents that part occurs when voltage is higher
Electric discharge；
High-voltage terminal, it is column aluminium alloy rod, upper end is connected by screw thread with aluminum voltage equalizing ball, and lower end is connected to high pressure
Electrode upper surface, the quick plug of voltage output line apparatus of voltage generation circuit, is connected with voltage equalizing ball；
Measurement signal output end, it is triaxial cable female, is exported for measurement signal to measuring and controlling；
Guard electrode terminals, the metal screws being connected for insertion lower shoe with guard electrode, are grounded for guard electrode；
Spring compacting device, the outside of high-voltage terminal is placed in, be installed between lower shoe and high-field electrode upper surface, used
Press in the insulating materials plane plate specimen and high-field electrode and measuring electrode good surface contact, the spring for ensureing different-thickness
Aluminium alloy sleeve pipe being set outside device, being discharged during for preventing that voltage is higher；
The present embodiment sets a upper plate, a lower shoe, using square insulating plate, for supporting high-field electrode, surveying
Measure electrode and guard electrode；
Support column is insulative cylinders, and 4 support columns are set in the present embodiment, for support upper and lower bottom plate and with electromagnetic shielding
Device keeps insulation；Upper and lower bottom plate and support column in the present embodiment are using specific insulation is high, chemical property is stable, is easy to
Teflon (PTFE) material of processing.
Refering to Fig. 3, the present embodiment measuring circuit overcurrent protection includes：
Current-limiting resistor, there is sufficiently large resistance value, for bearing supply voltage, and limit the electricity for flowing through diode
Flow, from the resistor that resistance value is 10M Ω (300W) as the current-limiting resistor in the present embodiment, it is allowed to apply highest electricity
Field intensity is about 50kV/mm, disclosure satisfy that Time Domain Dielectric Spectroscopy measures needs；
Diode, can bear 225mA rated current, and the diode should ensure that not in measuring circuit normal work
Conducting；
Shielding box, using the good stainless steel material of shielding properties, surface carries out oxidation processes, for for current-limiting resistor
Lucifuge sealing condition, the end device triaxial cable female of shielding box two, to ensure measurement signal without in are provided with diode
Measuring and controlling is transported in stealpass.
Refering to Fig. 4, the present embodiment electromagnetic screen is used to reduce the external electromagnetic in time-frequency domain dielectric spectra measurement process
Signal interference, including：
Metal-back, can be aluminium or copper material using the good electromagnetic shielding material of shielding properties, thickness is about 1mm, is used
In reducing the external electromagnetic signal interference in time-frequency domain dielectric spectra measurement process, stability is measured to improve, metal-back should be grounded；
Upper insulating sleeve and lower insulating sleeve, the high-voltage terminal for keeping measuring electrode device are exhausted when passing through metal-back
Edge, it is made of Teflon (PTFE) material,；
The STH of metal-back two, the voltage output line for voltage generation circuit penetrate electromagnetic screen with pressing
Ball connects, and the triaxial cable of measuring electrode output end connection passes electromagnetic screen metal-back；
Door hinge is shielded, is switched for electromagnetic screen, insulating materials test product is positioned over measurement before and after being convenient for measuring
In electrode assembly；
Door lock, screening arrangement is completely closed after ensureing the closing of screening arrangement door, improves the shield effectiveness of screening arrangement；
Earth terminal, for making metal-back effective grounding；
Measuring electrode system described in the utility model can realize insulating materials under different electric-field intensity and different temperatures
Time-frequency domain dielectric spectrometry, for the research and development of electric insulation new material, material insulation property and ageing state assess, can
To reach higher measurement accuracy, there is good measurement stability.
Claims (7)
1. a kind of insulating materials time-frequency domain dielectric spectra measuring electrode system, including：
Measuring electrode device, voltage generation circuit, measuring circuit overcurrent protection, time-frequency domain dielectric spectra measurement apparatus, temperature
Spend control device, electromagnetic screen and measuring and controlling, wherein, the high voltage input terminal of the measuring electrode device with it is described
Voltage generation circuit connects, and the signal output part of the measuring electrode device is through the measuring circuit overcurrent protection and institute
The connection of time-frequency domain dielectric spectra measurement apparatus is stated, forms measuring circuit；The temperature control equipment is placed in the measuring electrode device
Outside；The electromagnetic screen is used to reduce the external electromagnetic signal interference in time-frequency domain dielectric spectra measurement process；The survey
Amount control device is used to control by the measuring electrode device, measuring circuit overcurrent protection and time-frequency domain dielectric spectrometry
The measuring circuit that device is formed.
2. system according to claim 1, it is characterised in that the measuring electrode device includes：
High-field electrode, for applying combined-voltage in measurement；
Measuring electrode, measurement signal is produced during for measuring；
Guard electrode, for avoiding the influence of test product surface Leakage Current in measurement；
Measurement signal output end, exported for measurement signal；
Guard electrode terminals, it is grounded for guard electrode；
Spring compacting device, the insulating materials flat board test product and high-field electrode and measuring electrode surface for ensureing different-thickness are tight
Close good contact；
Upper and lower bottom plate, for supporting high-field electrode, measuring electrode and guard electrode；
Support column, for supporting upper and lower bottom plate and keeping insulating with electromagnetic screen.
3. system according to claim 1, it is characterised in that the measuring circuit overcurrent protection includes：
Resistor, diode and shielding box, wherein, the shielding box is used to provide lucifuge for the resistor and the diode
Sealing condition.
4. system according to claim 1, it is characterised in that the electromagnetic screen includes：Metal-back, upper insulation sleeve
Pipe and lower insulating sleeve, hinge, door lock and earth terminal.
5. system according to claim 2, it is characterised in that the high-field electrode, measuring electrode and guard electrode are adopted
Material, chrome-faced are used as by the use of brass.
6. system according to claim 2, it is characterised in that the upper and lower bottom plate and support column use Teflon material
Material.
7. system according to claim 4, it is characterised in that the metal-back uses aluminium or copper.
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| CN201720585341.9U CN206740864U (en) | 2017-05-24 | 2017-05-24 | A kind of insulating materials time-frequency domain dielectric spectra measuring electrode system |
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| CN201720585341.9U CN206740864U (en) | 2017-05-24 | 2017-05-24 | A kind of insulating materials time-frequency domain dielectric spectra measuring electrode system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387704A (en) * | 2018-09-18 | 2019-02-26 | 海南电网有限责任公司电力科学研究院 | A kind of device and measurement method measuring dielectric substance dielectric modulus |
| CN109581159A (en) * | 2018-11-30 | 2019-04-05 | 华北电力大学 | A kind of insulating liquid liquid, gaseous state and gas-liquid mixed state dielectric property test chamber |
| CN110007153A (en) * | 2019-03-22 | 2019-07-12 | 金华职业技术学院 | A kind of method of dielectric material spectrometry |
| CN110488170A (en) * | 2019-08-21 | 2019-11-22 | 哈尔滨理工大学 | A kind of electrode system for plate insulation sample breakdown test |
| CN110794273A (en) * | 2019-11-19 | 2020-02-14 | 哈尔滨理工大学 | Potential time domain spectrum testing system with high-voltage driving protection electrode |
| CN111077423A (en) * | 2020-01-07 | 2020-04-28 | 浙江大学 | Device and method for testing dielectric property of solid insulating material interface |
| CN111679167A (en) * | 2020-07-27 | 2020-09-18 | 中车青岛四方机车车辆股份有限公司 | Vehicle-mounted transformer bushing insulation performance evaluation method and test platform |
| CN111736043A (en) * | 2020-06-19 | 2020-10-02 | 西安交通大学 | XLPE cable degassing state evaluation method based on low-frequency dielectric spectrum |
-
2017
- 2017-05-24 CN CN201720585341.9U patent/CN206740864U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387704A (en) * | 2018-09-18 | 2019-02-26 | 海南电网有限责任公司电力科学研究院 | A kind of device and measurement method measuring dielectric substance dielectric modulus |
| CN109581159A (en) * | 2018-11-30 | 2019-04-05 | 华北电力大学 | A kind of insulating liquid liquid, gaseous state and gas-liquid mixed state dielectric property test chamber |
| CN110007153A (en) * | 2019-03-22 | 2019-07-12 | 金华职业技术学院 | A kind of method of dielectric material spectrometry |
| CN110488170A (en) * | 2019-08-21 | 2019-11-22 | 哈尔滨理工大学 | A kind of electrode system for plate insulation sample breakdown test |
| CN110794273A (en) * | 2019-11-19 | 2020-02-14 | 哈尔滨理工大学 | Potential time domain spectrum testing system with high-voltage driving protection electrode |
| CN111077423A (en) * | 2020-01-07 | 2020-04-28 | 浙江大学 | Device and method for testing dielectric property of solid insulating material interface |
| CN111736043A (en) * | 2020-06-19 | 2020-10-02 | 西安交通大学 | XLPE cable degassing state evaluation method based on low-frequency dielectric spectrum |
| CN111679167A (en) * | 2020-07-27 | 2020-09-18 | 中车青岛四方机车车辆股份有限公司 | Vehicle-mounted transformer bushing insulation performance evaluation method and test platform |
| CN111679167B (en) * | 2020-07-27 | 2022-06-14 | 中车青岛四方机车车辆股份有限公司 | Vehicle-mounted transformer bushing insulation performance evaluation method and test platform |
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Effective date of registration: 20210830 Address after: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee after: XI'AN JIAOTONG University Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee before: XI'AN JIAOTONG University Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |