CN106970307A - A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic - Google Patents
A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic Download PDFInfo
- Publication number
- CN106970307A CN106970307A CN201710295978.9A CN201710295978A CN106970307A CN 106970307 A CN106970307 A CN 106970307A CN 201710295978 A CN201710295978 A CN 201710295978A CN 106970307 A CN106970307 A CN 106970307A
- Authority
- CN
- China
- Prior art keywords
- voltage
- electric branch
- direct current
- current
- direct
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic; device includes direct current impact composite voltage generator, test cell, signal monitoring unit and electric branch characteristic analysis unit; direct current impact composite voltage generator is used to produce direct current impact composite voltage, is made up of dc source, the pulse power, coupled capacitor and protective resistance；Test cell is used to realize the pressurization of tested sample and the induction of electric branch, is made up of pin electrode, tested sample and grounding electrode；Signal monitoring unit is used to realize the form in electric branch growth course and the record of shelf depreciation high-frequency current signal；It is made up of computer, harvester, light microscope and HF current transformer.The present invention makes two kinds of voltages put on tested sample jointly using the coupling of DC voltage and overvoltage, produces direct current impact Composite Field, detects the electric branch characteristic that direct current cables insulate under this electric field, can effectively reflect direct current cables over-voltage condition.
Description
Technical field
The present invention relates to the research field of electric branch characteristic of the high-voltage DC cable insulating under excessive voltage condition, specifically
Say, be a kind of test device and its measuring method of high-voltage direct-current cable accessory electric branch characteristic.
Background technology
High voltage direct current cable transmission of electricity is to solve one of Large Copacity, remote, low-loss transmission of electricity problem important channel, direct current
The electric field of alternation is not present in cable, but because the difference of different insulative material electric conductivity causes insulating interior space charge buildup
Situation is complicated and electric field distortion is serious, easily triggers insulation ag(e)ing.The aging of cable insulation is progressively accumulation development, current work
Under skill level, electric branch growth is the main cause for causing insulation ag(e)ing or even puncturing.Electric branch is due to office in insulating materials
Discharge caused micron order discharge channel in portion, and air gap, impurity, irregular shape more in insulating materials etc. cause, Ke Nengyin
Complete or incomplete breakdown is distributed, the safe operation of cable transmission systems is had a strong impact on.
In exchange electric branch research, domestic and foreign scholars propose multiple models, and alternation electricity is not present under DC voltage
, cause Most models and do not apply to.The research for direct current electric branch is concentrated mainly on following several respects both at home and abroad：(1)
Insulate defective electrical treeing process and mechanism under DC electric field；(2) under different voltage levels electric branch triggering mechanism
And morphological feature；(3) electrical treeing and its triggering mechanism under the conditions of DC voltage short circuit grounding；(4) under the conditions of polarity inversion
Electric branch phenomenon.And also there is following surge voltage in the direct current cables of actual motion in addition to DC voltage：(1) drawn by overhead line
The lightning impulse voltage entered, (2) due to line fault, cut throw etc. generation operating impulse voltage；Which part surge voltage width
Value is up to being several times as much as circuit DC voltage and polarity may be identical or opposite with DC voltage.Surge voltage and circuit DC voltage
Superposition produces direct current-impact Composite Field, and collective effect insulate in direct current cables annex, line voltage distribution is drastically changed and cause electricity
Field distortion aggravates.And rarely having the research to electric branch under direct current-impact Composite Field both at home and abroad at present, its starting, growth mechanism are still
It is indefinite, seriously constrain the development of direct current cables attachment technique.
The content of the invention
The invention aims to overcome deficiency of the prior art, there is provided a kind of high-voltage direct-current cable accessory electric branch
The test device and method of characteristic, using the coupling of DC voltage and overvoltage, make two kinds of voltages put on tested sample jointly,
Direct current-impact Composite Field is produced, the electric branch characteristic that direct current cables under this electric field insulate is detected, than existing testing scheme, more
It is actual close to engineering, it can effectively reflect direct current cables over-voltage condition, be that direct current cables annex insulating Design and operation provide real
Test and theoretical foundation.
The purpose of the present invention is achieved through the following technical solutions：
A kind of test device of high-voltage direct-current cable accessory electric branch characteristic, including direct current-impact composite voltage generator,
Test cell, signal monitoring unit and electric branch characteristic analysis unit, the direct current-impact composite voltage generator are used to produce
Direct current-impact composite voltage, is made up of dc source, the pulse power, coupled capacitor and protective resistance, the dc source it is straight
The surge voltage adjustable range for flowing voltage regulation limits and the pulse power is 0 to 100KV, the rising of the surge voltage
Along and trailing edge be 1 to 1000 μ s adjustable, the coupled capacitor is used for will work simultaneously after DC voltage and surge voltage superposition
For tested sample；
The test cell be used for realize the pressurization of tested sample and the induction of electric branch, by pin electrode, tested sample and
Grounding electrode is constituted；The signal monitoring unit is used to realize the form and shelf depreciation high frequency electric in electric branch growth course
The record of signal；It is made up of computer, harvester, light microscope and HF current transformer.
A kind of method of testing of the test device of high-voltage direct-current cable accessory electric branch characteristic, comprises the following steps：
(1) pin electrode is preset in insulation sample, insulation sample is placed on the grounding electrode in test cell and connected
Connect power line and ground wire；
(2) HF current transformer is socketed on power line, opens light microscope and focus to can clearly see
Pin electrode tip is measured, HF current transformer and light microscope are connected to computer by harvester；
(3) regulation dc source opens the pulse power to setting value, after DC voltage stability and applies surge voltage；
(4) generation of observation electric branch whether and record high-frequency current signal value and electric branch form.
Pin electrode is 2-4mm apart from the distance of grounding electrode in step (1).
Compared with prior art, the beneficial effect that technical scheme is brought is：
The test to electric branch feature under actual condition can be achieved in the present invention, is more nearly engineering reality, with simple application
DC voltage or the simple surge voltage that applies have significantly different；The HVDC under direct current-impact Composite Field can accurately be disclosed
Cable insulation electric branch growth mechanism, is that high voltage direct current cable operation and insulating Design provide reliable experimental basis and test side
Method.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the typical DC-impact composite voltage schematic diagram produced by apparatus of the present invention.
Reference：1- direct currents-impact composite voltage generator, 2- signal monitoring units, 3- test cells, 4- direct currents
Source, the 5- pulse powers, 6- protective resistances, 7- protective resistances, 8- coupled capacitors, 9- computers, 10- harvesters, 11- high-frequency electricals
Current transformer, 12- light microscopes, 13- pin electrodes, 14- tested samples, 15- grounding electrodes
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
High-voltage direct-current cable accessory electric branch characteristic test device includes under direct current-impact Composite Field that the present embodiment is provided
Direct current-impact composite voltage generator 1, signal monitoring unit 2, test cell 3 and electric branch characteristic analysis unit.Such as Fig. 1 institutes
Show, produce direct current-impact composite voltage using direct current-impact composite voltage generator 1, put on the pin electrode of tested sample 14
13 to test the electric branch characteristic under different voltage parameters, and electric branch starting and growth parameter(s) are by signal monitoring unit record.Respectively
Part detailed functions are as follows：
(1) function of direct current-impact composite voltage generator 1 be produce direct current-impact composite voltage, by dc source 4,
The pulse power 5, coupled capacitor 8, protective resistance 6 and protective resistance 7 are constituted；5 points of dc source 4 and the pulse power in the present embodiment
Not Xuan Yong the literary high pressure in Tianjin east DW-N1003 and the prosperous Hua Tai in Wuhan three PV102AC, realize direct current and punching using coupled capacitor 8
The superposition of voltage is hit, effective protection to direct current and the pulse power is realized using protective resistance 6 and protective resistance 7.Dc source 4
DC voltage range be 0 adjustable to ± 100kV, the surge voltage amplitude of the pulse power 5 is adjustable to ± 100kV for 0, impact electricity
It is 1 to 1000 μ s adjustable to press rising edge and trailing edge.It produces typical direct current-impact composite voltage as shown in Fig. 2 impact
Voltage superposition is on DC voltage, while acting on tested sample.
(2) function of test cell 3 is to realize pressurization and the induction of electric branch to tested sample 14, by pin electrode 13,
Tested sample 14 and grounding electrode 15 are constituted.Pin electrode 13 is preset in tested sample 14 before test, quilt in the present embodiment
Test specimens 14 are cable insulation material, are made up of, apply direct current-impact composite voltage crosslinked polyethylene, silicon rubber etc. in test
Pin electrode is added on, changes voltage parameter and induces electric branch.
(3) function of signal monitoring unit 2 is to realize the form and shelf depreciation high frequency electric in electric branch growth course
Signal record, by computer 9, harvester 10 (RUIS-EX500), light microscope 12 (SEN-XDC-10B) and high frequency electric
Transformer 11 is constituted, and the present embodiment high-frequency current transformer 11 is from Tianjin scholar's power equipment Science and Technology Ltd.
HCT44D.The overall process that electric branch is produced and grown is recorded using light microscope 12 in test, while mutual using high frequency electric
The high-frequency current signal produced in the record electric branch growth course of sensor 11.
Further, by the test device shown in Fig. 1, that is tested comprises the following steps that：
1. pin electrode is preset in direct current cables insulation sample, it is placed on the grounding electrode in test cell and connects electricity
The distance of source line and ground wire, pin electrode and grounding electrode is 2-4mm.
2. HF current transformer is socketed on power line, opens light microscope and focus to can clearly observe
To pin electrode tip.HF current transformer and light microscope are connected to computer by harvester.
3. dc source is adjusted to setting value, the after-applied surge voltage of DC voltage stability.
4. whether observation has electric branch to generate and records high-frequency current signal value and electric branch form.
The present invention is not limited to embodiments described above.The description to embodiment is intended to describe and said above
Bright technical scheme, above-mentioned embodiment is only schematical, is not restricted.This is not being departed from
In the case of invention objective and scope of the claimed protection, one of ordinary skill in the art may be used also under the enlightenment of the present invention
The specific conversion of many forms is made, these are belonged within protection scope of the present invention.
Claims (3)
1. a kind of test device of high-voltage direct-current cable accessory electric branch characteristic, it is characterised in that including direct current-impact compound electric
Generator, test cell and signal monitoring unit are pressed, the direct current-impact composite voltage generator is used to produce direct current-impact
Composite voltage, is made up of dc source, the pulse power, coupled capacitor and protective resistance, and the DC voltage of the dc source is adjusted
The surge voltage adjustable range of adjusting range and the pulse power is 0 to 100KV, the rising edge of the surge voltage and decline
Along being 1 to 1000 μ s adjustable, the coupled capacitor is used to simultaneously acting on after DC voltage and surge voltage superposition tested
Sample；
The test cell is used to realize the pressurization of tested sample and the induction of electric branch, by pin electrode, tested sample and ground connection
Electrode is constituted；The signal monitoring unit is used to realize the form and shelf depreciation high-frequency current signal in electric branch growth course
Record；It is made up of computer, harvester, light microscope and HF current transformer.
2. a kind of method of testing of the test device of high-voltage direct-current cable accessory electric branch characteristic according to claim 1, its
It is characterised by, comprises the following steps：
(1) pin electrode is preset in insulation sample, insulation sample is placed on the grounding electrode in test cell and electricity is connected
Source line and ground wire；
(2) HF current transformer is socketed on power line, opens light microscope and focus to can clearly observe
Pin electrode tip, computer is connected to by HF current transformer and light microscope by harvester；
(3) regulation dc source opens the pulse power to setting value, after DC voltage stability and applies surge voltage；
(4) generation of observation electric branch whether and record high-frequency current signal value and electric branch form.
3. a kind of method of testing of the test device of high-voltage direct-current cable accessory electric branch characteristic according to claim 2, its
It is characterised by, pin electrode is 2-4mm apart from the distance of grounding electrode in step (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710295978.9A CN106970307A (en) | 2017-04-28 | 2017-04-28 | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710295978.9A CN106970307A (en) | 2017-04-28 | 2017-04-28 | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106970307A true CN106970307A (en) | 2017-07-21 |
Family
ID=59330482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710295978.9A Pending CN106970307A (en) | 2017-04-28 | 2017-04-28 | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106970307A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478972A (en) * | 2017-09-22 | 2017-12-15 | 南方电网科学研究院有限责任公司 | Testing device and method for cable accessory |
| CN108020763A (en) * | 2017-12-14 | 2018-05-11 | 长沙理工大学 | A kind of monitoring method of direct current submarine cable early stage electricity tree defect |
| CN108680836A (en) * | 2018-04-26 | 2018-10-19 | 天津大学 | Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system |
| CN108693451A (en) * | 2018-04-26 | 2018-10-23 | 天津大学 | Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system |
| CN108710066A (en) * | 2018-05-18 | 2018-10-26 | 青岛科技大学 | A kind of interface discharging detection device and its method |
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN108872815A (en) * | 2018-07-05 | 2018-11-23 | 天津大学 | Direct current cables insulating materials high temperature ageing based on Composite Field assesses device |
| CN109001599A (en) * | 2018-07-05 | 2018-12-14 | 天津大学 | Direct current cables insulating materials high temperature ageing degree assessment method based on Composite Field |
| CN109344847A (en) * | 2017-12-07 | 2019-02-15 | 太原理工大学 | Mining XLPE cable insulation electric branch growth phase recognition methods based on sparse decomposition |
| CN109521337A (en) * | 2018-11-24 | 2019-03-26 | 天津大学 | A kind of electrostrictive polymer branch characteristic measuring device and method based on ultrasonic method |
| CN109581171A (en) * | 2018-12-30 | 2019-04-05 | 天津大学 | High-frequency current method compound field intermediate joint of electric cable partial discharge detecting system |
| CN109946575A (en) * | 2019-03-20 | 2019-06-28 | 天津大学 | Based on the intermediate joint of electric cable partial discharge detecting system under compound field |
| CN110057816A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field |
| CN110057817A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | Insulating materials ageing tester based on electro thermal coupling field |
| CN110068751A (en) * | 2019-03-22 | 2019-07-30 | 天津大学 | Low temperature electric branch aging assessment based on DC stacked harmonic wave |
| CN110095699A (en) * | 2018-01-27 | 2019-08-06 | 天津大学 | A kind of superconducting insulation material aging appraisal procedure based on compound field |
| CN110658429A (en) * | 2019-11-03 | 2020-01-07 | 西南交通大学 | Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network |
| CN111551833A (en) * | 2020-06-12 | 2020-08-18 | 天津大学 | Cable buffer layer partial discharge test system under extremely inhomogeneous electric field |
| CN112904163A (en) * | 2021-01-22 | 2021-06-04 | 天津大学 | Electric tree detection characterization method based on microstrip transmission line |
| CN112989596A (en) * | 2021-03-09 | 2021-06-18 | 天津大学 | Electric tree degradation analysis method under mechanical stress action based on driving energy |
| CN115712042A (en) * | 2022-11-17 | 2023-02-24 | 国网江苏省电力有限公司南京供电分公司 | Experimental system for simulating degradation of insulated electrical tree under cable load circulation and using method |
| CN117872047A (en) * | 2023-12-08 | 2024-04-12 | 西南交通大学 | DC impulse voltage epoxy resin performance evaluation method based on electrification characteristics |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558533A (en) * | 2013-11-20 | 2014-02-05 | 国家电网公司 | Insulation aging diagnostic system and method based on 10kV XLPE cable |
| CN203562978U (en) * | 2013-10-28 | 2014-04-23 | 重庆大学 | Transformer oil purifier based on high-voltage pulse superposition direct-current electric field generation technology |
-
2017
- 2017-04-28 CN CN201710295978.9A patent/CN106970307A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203562978U (en) * | 2013-10-28 | 2014-04-23 | 重庆大学 | Transformer oil purifier based on high-voltage pulse superposition direct-current electric field generation technology |
| CN103558533A (en) * | 2013-11-20 | 2014-02-05 | 国家电网公司 | Insulation aging diagnostic system and method based on 10kV XLPE cable |
Non-Patent Citations (6)
| Title |
|---|
| F. NOTO 等: "TREE INITIATION IN POLYETHYLENE BY APPLICATION OF DC AND IMPULSE VOLTAGE", 《INTERNATIONAL CONFERENCE ON ELECTRICAL INSULATION》 * |
| S. FUJITA 等: "Discharge Phenomena in Simulated Tree Channels by Applying DC and Impulse Voltage", 《PROCEEDINGS OF 1995 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS》 * |
| 刘云鹏 等: "电声脉冲法研究热老化对160kV直流电缆绝缘材料陷阱特性的影响", 《电工技术学报》 * |
| 周远翔 等: "硅橡胶电树枝老化显微图像与局部放电特性对应关系", 《高电压技术》 * |
| 夏岩松 等: "硅橡胶绝缘介质中电树的特性研究", 《高压电器》 * |
| 廖瑞金 等: "交联聚乙烯电力电缆的电树枝化试验及其局部放电特征", 《中国电机工程学报》 * |
Cited By (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478972B (en) * | 2017-09-22 | 2023-05-16 | 南方电网科学研究院有限责任公司 | Testing device and method for cable accessories |
| CN107478972A (en) * | 2017-09-22 | 2017-12-15 | 南方电网科学研究院有限责任公司 | Testing device and method for cable accessory |
| CN109344847A (en) * | 2017-12-07 | 2019-02-15 | 太原理工大学 | Mining XLPE cable insulation electric branch growth phase recognition methods based on sparse decomposition |
| CN109344847B (en) * | 2017-12-07 | 2022-03-15 | 太原理工大学 | Mining XLPE cable insulation electric branch growth stage identification method based on sparse decomposition |
| CN108020763B (en) * | 2017-12-14 | 2020-02-11 | 长沙理工大学 | Method for monitoring early-stage electric tree defects of direct-current submarine cable |
| CN108020763A (en) * | 2017-12-14 | 2018-05-11 | 长沙理工大学 | A kind of monitoring method of direct current submarine cable early stage electricity tree defect |
| CN110095699A (en) * | 2018-01-27 | 2019-08-06 | 天津大学 | A kind of superconducting insulation material aging appraisal procedure based on compound field |
| CN108693451A (en) * | 2018-04-26 | 2018-10-23 | 天津大学 | Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system |
| CN108680836A (en) * | 2018-04-26 | 2018-10-19 | 天津大学 | Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system |
| WO2019080494A1 (en) * | 2018-05-18 | 2019-05-02 | 青岛科技大学 | Interface discharge detection apparatus and method therefor |
| CN108710066A (en) * | 2018-05-18 | 2018-10-26 | 青岛科技大学 | A kind of interface discharging detection device and its method |
| CN108872815A (en) * | 2018-07-05 | 2018-11-23 | 天津大学 | Direct current cables insulating materials high temperature ageing based on Composite Field assesses device |
| CN109001599A (en) * | 2018-07-05 | 2018-12-14 | 天津大学 | Direct current cables insulating materials high temperature ageing degree assessment method based on Composite Field |
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN109521337A (en) * | 2018-11-24 | 2019-03-26 | 天津大学 | A kind of electrostrictive polymer branch characteristic measuring device and method based on ultrasonic method |
| CN109581171A (en) * | 2018-12-30 | 2019-04-05 | 天津大学 | High-frequency current method compound field intermediate joint of electric cable partial discharge detecting system |
| CN110057817A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | Insulating materials ageing tester based on electro thermal coupling field |
| CN109946575A (en) * | 2019-03-20 | 2019-06-28 | 天津大学 | Based on the intermediate joint of electric cable partial discharge detecting system under compound field |
| CN110057816A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field |
| CN110068751A (en) * | 2019-03-22 | 2019-07-30 | 天津大学 | Low temperature electric branch aging assessment based on DC stacked harmonic wave |
| CN110658429B (en) * | 2019-11-03 | 2021-03-23 | 西南交通大学 | Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network |
| CN110658429A (en) * | 2019-11-03 | 2020-01-07 | 西南交通大学 | Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network |
| CN111551833A (en) * | 2020-06-12 | 2020-08-18 | 天津大学 | Cable buffer layer partial discharge test system under extremely inhomogeneous electric field |
| CN112904163B (en) * | 2021-01-22 | 2023-02-21 | 天津大学 | Electric tree detection characterization method based on microstrip transmission line |
| CN112904163A (en) * | 2021-01-22 | 2021-06-04 | 天津大学 | Electric tree detection characterization method based on microstrip transmission line |
| CN112989596B (en) * | 2021-03-09 | 2022-03-01 | 天津大学 | Electric tree degradation analysis method under mechanical stress action based on driving energy |
| CN112989596A (en) * | 2021-03-09 | 2021-06-18 | 天津大学 | Electric tree degradation analysis method under mechanical stress action based on driving energy |
| CN115712042A (en) * | 2022-11-17 | 2023-02-24 | 国网江苏省电力有限公司南京供电分公司 | Experimental system for simulating degradation of insulated electrical tree under cable load circulation and using method |
| CN117872047A (en) * | 2023-12-08 | 2024-04-12 | 西南交通大学 | DC impulse voltage epoxy resin performance evaluation method based on electrification characteristics |
| CN117872047B (en) * | 2023-12-08 | 2024-08-06 | 西南交通大学 | DC impulse voltage epoxy resin performance evaluation method based on electrification characteristics |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106970307A (en) | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic | |
| CN103278752A (en) | Device and method for corona accelerated aging of polymer insulating material | |
| CN109856516A (en) | A kind of high frequency square wave dielectric discharge characteristic experimental apparatus | |
| CN108387827A (en) | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage and method | |
| CN103605051B (en) | The partial discharge test most advanced and sophisticated defect device of gas-insulated metal under surge voltage | |
| CN109521337A (en) | A kind of electrostrictive polymer branch characteristic measuring device and method based on ultrasonic method | |
| CN108680835A (en) | Paper oil insulation surface charge measuring device and method based on DC stacked harmonic wave | |
| CN107817430A (en) | A kind of method that cable local discharge defect is observed by transparent terminal | |
| CN207636667U (en) | The detecting system of insulating layer DC conductance under high voltage direct current cable operating condition | |
| CN202522537U (en) | Insulating tool edge planar defect on-site detection device | |
| CN205484682U (en) | Female heat shrinkage bush pressure resistance testing arrangement that arranges of transformer substation | |
| CN208140866U (en) | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage | |
| CN107576897A (en) | A kind of high-voltage cable insulating burn in test circuit and its method of testing | |
| CN218995632U (en) | Short circuit test device with adjustable short circuit current | |
| CN106841942B (en) | A method of it obtains and impacts lower grounding body surrounding soil ionic discharge starting field strength | |
| CN205139284U (en) | Instrument is sent in direct current examination | |
| CN111665425A (en) | Device and method for rapidly detecting tree resistance of crosslinked polyethylene cable | |
| CN207380180U (en) | A kind of high-voltage cable insulating burn in test circuit | |
| CN208092189U (en) | Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system | |
| Xiong et al. | Flashover and partial discharge characteristics of fiber of valve tower in converter station | |
| CN205484512U (en) | Arrester leaks current sample device | |
| CN212301751U (en) | Quick detection device of anti electrical tree ability of crosslinked polyethylene cable | |
| CN212459792U (en) | Experimental termination of multi-functional transformer of 110kV and above transformer suspension type | |
| CN105606980A (en) | Device for testing voltage endurance of substation bus bar heat-shrinkable bush | |
| CN210982609U (en) | Quick measuring device of reactor direct current resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170721 |