CN201886100U - Equipment for testing ageing resistance and water-tree resistance of medium voltage cable - Google Patents
Equipment for testing ageing resistance and water-tree resistance of medium voltage cable Download PDFInfo
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- CN201886100U CN201886100U CN2010206677145U CN201020667714U CN201886100U CN 201886100 U CN201886100 U CN 201886100U CN 2010206677145 U CN2010206677145 U CN 2010206677145U CN 201020667714 U CN201020667714 U CN 201020667714U CN 201886100 U CN201886100 U CN 201886100U
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Abstract
The utility model discloses equipment for testing the ageing resistance and the water-tree resistance of a medium voltage cable, and the equipment comprises a medium frequency generator set, a control cabinet, a measuring frequency control console, a constant temperature control console, a power supply control console, a three-phase alternating current transformer, a voltage-dividing capacitor, a reactor and a constant temperature water bath case. The medium frequency generator set is connected with the control cabinet and the measuring frequency control console in sequence; the commercial power is connected with the measuring frequency control console through the power supply control console and the three-phase alternating current transformer in sequence; the measuring frequency control console is connected with the voltage-dividing capacitor, the reactor and a testing cable connector in the constant temperature water bath case in sequence; temperature control equipment in the constant temperature water bath case is connected with the constant temperature control console; and the constant temperature control console is connected with a computer data collection system. The equipment successfully solves the problem of the ageing test of the medium voltage cable, the test data is accurate, the equipment structure is simple, the cost is low, and a set of usable and stable testing equipment is provided for the testing the ageing resistance and the water-tree resistance of the medium voltage cable.
Description
Technical field
The utility model relates to a kind of cable testing equipment, specifically is a kind of equipment of testing the anti-aging and water tree resistant property of midium voltage cable.
Background technology
Fast development along with cable industries, China's cable strides forward to the aiming market abroad from satisfying self-demand gradually, because various countries are to the difference of cable performance requirement and the difference of test condition, can produce the cable that meets the country variant standard to China, and successfully land the market abroad and brought new challenge
According to South Africa product standard SANS1339:2003 requirement, the goods producer should prove the long-term reliability and the anti-water tree property of the material that the core of its midium voltage cable of producing (three-layer co-extruded cross-linking polyethylene insulated cable) is used.This standard provides power frequency (50Hz3U for this reason
02 years) and intermediate frequency (500Hz3U
03000 hours) two cover testing programs.Test method is pressed SABS SM 1284-5:2000 standard-required and is carried out.SABS SM 1284-5:2000 standard is to from test apparatus, power-supply unit, and test sample, testing procedure, the content of outcome evaluation and water tree experiment six sports 18 events is stipulated.The applicant is seeking advice from domestic well-known measuring station, and the result is present such checkout equipment of domestic nothing, can't implement to detect.
The purpose of midium voltage cable long-term aging test is the long-term reliability of the three-layer co-extruded insulating material of proof and can stops the generation of water tree.The ultimate principle of long-term aging test is: between the insulation of sample two ends and shielding a continual water source is installed, and to be immersed in temperature be in 50 ℃ the water after 1000 hours in the sample outside, at room temperature this sample added 3U again
0Voltage 3000 hours, withstand voltage 3000 hours during total down-time can not surpass 24 hours and will supply stop time, do disruptive test by pretreated sample, require process of the test is done omnidistance the supervision, the validity record data are provided.
The utility model content
Technical problem to be solved in the utility model provides a kind of equipment that satisfies midium voltage cable long-term ageing and the test of anti-water tree.
The equipment of the anti-aging and water tree resistant property of test midium voltage cable described in the utility model, it comprises the intermediate frequency generator group, switch board, the test frequency control desk, the thermostatic control platform, electrical power control cabinet, three-phase ac transformer, voltage-dividing capacitor, reactor and constant water bath box, described intermediate frequency generator group connects switch board and test frequency control desk successively, civil power passes through electrical power control cabinet successively, three-phase ac transformer connects the test frequency control desk, the test frequency control desk connects voltage-dividing capacitor successively, the test cable joint of reactor to the constant water bath box, temperature control device in the constant water bath box connects the thermostatic control platform, and the thermostatic control platform connects computer data acquisition system.
Above-mentioned test frequency control desk and voltage-dividing capacitor thereof, reactor have 2 covers, and are connected in parallel to the test cable joint in the constant water bath box, and two cover test frequency control desks and voltage-dividing capacitor thereof, reactor be corresponding 50 Hz and 500 Hz test frequencies respectively.
In constant water bath box, be provided with the test cable mounting bracket.
The utility model has successfully solved the problem of midium voltage cable aging test, and test data is accurate, and device structure is simple, and is with low cost, and the test of anti-aging and water tree resistant property provides a cover available, reliable testing apparatus for midium voltage cable.
Description of drawings
Fig. 1 is a structural representation of the present utility model,
Fig. 2 is the structural representation of water terminal,
Fig. 3 is the front view of test cable mounting bracket,
Fig. 4 is the side view of test cable mounting bracket.
Embodiment
1, agent structure of the present utility model
As shown in Figure 1, a kind of equipment of testing the anti-aging and water tree resistant property of midium voltage cable of the present utility model, mainly comprise intermediate frequency generator group, switch board, test frequency control desk, thermostatic control platform, electrical power control cabinet, three-phase ac transformer, voltage-dividing capacitor, reactor and constant water bath box, wherein:
The intermediate frequency generator group connects switch board and test frequency control desk successively, civil power connects the test frequency control desk by electrical power control cabinet, three-phase ac transformer successively, the test frequency control desk connects voltage-dividing capacitor, the reactor test cable joint to the constant water bath box successively, temperature control device in the constant water bath box connects the thermostatic control platform, the thermostatic control platform connects computer data acquisition system, is provided with the test cable mounting bracket in constant water bath box.
Test frequency control desk and voltage-dividing capacitor thereof, reactor have 2 covers, and are connected in parallel to the test cable joint in the constant water bath box, and two cover test frequency control desks and voltage-dividing capacitor thereof, reactor be corresponding 50 Hz and 500 Hz test frequencies respectively.
2, equipment configuration
(1) water bath with thermostatic control system
According to standard-required: it is 1 volume that sample should be no less than 10 meters, every coiling two to three circles, end must be in more than the waterline and bottom at least on the water tank top more than 50 centimetres, each volume and terminal must fixedly make it can't move in test, heating period, the water tank water temperature is controlled at 50 ℃ ± 5 ℃ and kept then 1000 hours.It is that 2.5 meters constant water bath box temperature control precision ± 1 ℃ and triangular supports circle of 3 meters of external diameters (in be connected to) satisfy above requirement that the utility model has designed a height; but require in the senile experiment process that system downtime did not allow above 24 hours in 3000 hours whole processes of pressurization; and in case middle of short duration stopping; experimental period must prolong, to supply the time of loss.Include all experimental datas in computing machine for this reason,, cause the loss of computer data and the error of omission of experimental data, computing machine has been installed uninterrupted power source for preventing accident power-off by computing machine per minute record.
(2) intermediate frequency withstand voltage test system
Need in the process of the test to convert power frequency 50Hz to 500Hz, because cable is capacitive impedance, be guaranteed output factor cos Ф=1, must select a suitable inductive impedance to compensate, because power factor (PF) words leading or that lag behind all can bring load to increase, and the power of generator is certain, if it is improper that the compensating inductance device is selected, can cause system overload, even can make generator overheating and burn, but the length of sample reduces to 168 meters gradually by 200 meters in the experimentation.We have installed overcurrent protective device on the high-tension electricity depressor for this reason, and two compensation reactors have been installed.The intermediate frequency pressurized system finally is fixed to following four part compositions after debugging repeatedly,
One, by intermediate frequency generator group and switch board,
Two, intermediate frequency switch board,
Three, intermediate frequency HT testing transformer,
Four, reactor is two.
3. the debugging of total system is pinpointed the problems for guaranteeing the debug phase, and what adopt during debugging is authentic simulation test, and concrete operations are as follows.
(1) sample chooses
By SABS SM 1284-5:2000 requirement regulation, test should be carried out on the three-layer co-extruded insulated wire cores of rated voltage 6.35/11kV, and heart yearn should be copper or aluminium conductor, and specification is 95 to 400mm
2Test in arbitrary specification in the scope, all samples should judge that qualified product extracts from partial discharge test.
Sample length: during 500Hz, divide 15 sections, 14 meters every section, wherein 12 sections are used for final withstand voltage test and the test of water tree, and 3 sections, when dividing 750 hours, 1500 hours, 2250 hours, each takes out one section and carries out withstand voltage test or the test of water tree.And remaining 12 sections, after 3000 hours, all take out and carry out withstand voltage and the test of water tree.
(2) test is carried out
1) making of secondary terminal and water terminal is compared with the plasma water terminal of external expert introduction, and the homemade secondary terminal of the utility model is more suitable on cost performance.Its specific practice is as follows:
Two ends at every single sample, divest apart from the termination and shield outside the insulation in 1.2 meters, surface with insulation under the glass finishing, the cut that may occur, shield residue outward and strike off, with fine sandpaper with the polishing of cable insulation surface, and clean with cleansing tissue, in insulation, coat electric insulating sealant then, and secondary terminal is installed.Then, excision insulation in 0.55 meter apart from the termination is made the terminal that blocks water at 0.1 meter of distance excision face, and the water terminal is installed in the back.Water terminal of the present utility model adopts conventional plastic casing, and makes a terminal that blocks water on cable, realizes same effect, and in service more than 1 year does not go wrong, and sees Fig. 2, the stage casing is insulation 1 among the figure, in the upper funnel shape plastic casing water 2 is housed, and the bottom is a secondary terminal 3.
SHAPE * MERGEFORMAT 2) installation of sample, with a leg-of-mutton support or the support of four limit row (in be connected to the circle of 3 meters of external diameters, to reach) around the about 10 meters length requirement of three circles, cable around top, is placed in the water tank then, must guard against when carrying out the installation of sample, with damage in insulation, if insulation answers mark clear before sample is done flash test, in order to avoid invalid data influences testing result because cause damage in the operating process.Generally speaking, meeting is wrapped one deck copper strips in the outside of single insulated wire cores, and the one, directly ground connection is played the electronegative potential effect in withstand voltage process, and another effect is exactly to prevent from installation process insulated wire cores to be damaged to some extent.But we find that the core of walking around copper strips is not easy around to support in the practical operation, having adopted second method during the utility model experiment is not that whole section ground is around copper strips, just at secondary terminal to local wrapped one deck copper strips of 0.5 meter under water, more in addition with a ground rod Jiang Shui with couple together.The synoptic diagram of installing is seen Fig. 3 and Fig. 4.
3) pre-service
Water is injected water tank, and be warmed to 50 ± 5 ℃, cable is put into water tank, and kept 1000 hours, during this period the temperature in the water tank is monitored, and the situation of this temperature variation is gathered the formation temperature curve of cyclical fluctuations by computer, with foundation as this cable process preheating.In advance
4) aging test
Close water bath with thermostatic control earlier water temperature is cooled to room temperature, open computing machine and open the 500Hz acquisition system, start capture program, start pressurized system then, at this moment, by former mounted analog to digital converter with the voltage signal of output by the computer collection, and form continuous voltage acquisition figure on computers, and simultaneously the signals collecting of frequency is come out, and form continuous voltage acquisition figure on computers.Certainly, the collection of these signals all is in order to characterize cable at the corresponding residing state of duration of test, is the foundation of testing.
Other 3 sections samples of mentioning in the above are the performance history usefulness of doing experiment, and mainly be the validity of judging test, such as the sample material are bad, does not also just reach to the time to have required, and will assess this test and have the necessity of going on doing or not.Main operation is as follows: aging when carrying out 750 hours, first section taken out do flash test; Whether if the result is qualified, test will normally go on, if the result is defective, assesses and continue again to do experiment or resample and do experiment, and aging when proceeding to 1500 hours, second section taken out test; Aging when proceeding to 2250 hours, the 3rd section taken out test,, will test all samples of full 3000 hours if all the result is qualified, the whole test result is carried out efficiency assessment, and the quality of sample is assessed with effective result.
4, voltage test (appraisal procedure of sample mass)
Core is taken out from water tank, be divided into 12 sections on request, 10 meters every section (because of power frequency step by step the sample of flash test need effective cable length of at least 7.93 meters), and with on the cable wrapped one deck copper strips or copper wire the establishment so that ground connection, the deionized water terminal of the 350kV that packs into is used at two ends or other can carry out the terminal of high-potting, applies 3U to cable earlier
0Voltage 5 minutes, then voltage is brought up to 4U
0Continue 5 fens kinds, increase progressively successively, increase 1U at every turn
0/ 5 minutes times until puncture.11 samples that the test successively that uses the same method is left, and write down the magnitude of voltage that it can bear.This is tested us and entrusts national electric wire quality supervision inspection center and mark the on-the-spot affirmation of the expert of the Bureau of Standards through South Africa country.
5, water tree test
To near near the puncture place, cut 30 disks from through on the sample of above-mentioned voltage test, and prepare methylenum careuleum and the 0.5 ± 0.1g sodium carbonate of 6g ± 0.1g in 250 milliliters beaker, the distilled water that adds 200 milliliters is then made solution.Heated solution to 70 ± 2 ℃ also kept 4 hours, constantly stirred solution, and sealed the beaker mouth with polyethylene film and avoid evaporating.Before using solution first, solution is placed in the heating cabinet heats, make temperature reach 70 ± 2 ℃, kept this temperature at least 10 hours, and careful then sample be immersed in 70 ± 2 ℃ of methylene blue solutions 4 hours, after with its taking-up, the water flushing also dries, and is using alcohol wash, back airing.Any aperture or the tree as the bowknot can estimate with 3 times magnifier under clear seeing.Then the situation of observed aperture and water tree is carried out record with regard to size and quantity.
6. test result analysis
(1) content of insulation course water tree is high more, can cause cable alternating current breakdown strength degradation, shortens the serviceable life of cable operation.The water tree can grow very fast under certain environmental baseline, and finally causes the puncture of cable.
(2) the life-span equation of crosslinked cable is U
nT=C wherein U is the voltage that applies on the cable, and t is the serviceable life of cable, and n is a life index, and C is a constant.And life index is one big crucial, has known the n value, just can record its pressure-resistant time in the short period of time by boosted voltage, thereby try to achieve the life-span equation, thereby can estimate serviceable life of its cable.Can be similar to the succinct life index of asking by adopting to boost step by step.
Claims (3)
1. equipment of testing the anti-aging and water tree resistant property of midium voltage cable, it is characterized in that: comprise the intermediate frequency generator group, switch board, the test frequency control desk, the thermostatic control platform, electrical power control cabinet, three-phase ac transformer, voltage-dividing capacitor, reactor and constant water bath box, described intermediate frequency generator group connects switch board and test frequency control desk successively, civil power passes through electrical power control cabinet successively, three-phase ac transformer connects the test frequency control desk, the test frequency control desk connects voltage-dividing capacitor successively, the test cable joint of reactor to the constant water bath box, temperature control device in the constant water bath box connects the thermostatic control platform, and the thermostatic control platform connects computer data acquisition system.
2. the equipment of the anti-aging and water tree resistant property of test midium voltage cable according to claim 1, it is characterized in that: described test frequency control desk and voltage-dividing capacitor thereof, reactor have 2 covers, and be connected in parallel to the test cable joint in the constant water bath box, two cover test frequency control desks and voltage-dividing capacitor thereof, reactor be corresponding 50 Hz and 500 Hz test frequencies respectively.
3. the equipment of the anti-aging and water tree resistant property of test midium voltage cable according to claim 1 and 2 is characterized in that: be provided with the test cable mounting bracket in constant water bath box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206677145U CN201886100U (en) | 2010-12-20 | 2010-12-20 | Equipment for testing ageing resistance and water-tree resistance of medium voltage cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206677145U CN201886100U (en) | 2010-12-20 | 2010-12-20 | Equipment for testing ageing resistance and water-tree resistance of medium voltage cable |
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| Publication Number | Publication Date |
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| CN201886100U true CN201886100U (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206677145U Expired - Fee Related CN201886100U (en) | 2010-12-20 | 2010-12-20 | Equipment for testing ageing resistance and water-tree resistance of medium voltage cable |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096031A (en) * | 2010-12-20 | 2011-06-15 | 无锡江南电缆有限公司 | Apparatus for testing ageing resistance and water tree resistance performances of medium voltage cable |
| CN103207140A (en) * | 2013-02-07 | 2013-07-17 | 华北电力科学研究院有限责任公司 | Device for wire comprehensive factor aging test |
| CN103278754A (en) * | 2013-05-15 | 2013-09-04 | 广州供电局有限公司 | Equipment and method for culturing cable water tree |
| CN104215511A (en) * | 2013-05-29 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Cable environmental stress testing apparatus |
| CN104360200A (en) * | 2014-11-25 | 2015-02-18 | 四川明星电缆股份有限公司 | Test device and test method for cable resistant to high temperature and high pressure steam |
| CN107003349A (en) * | 2014-12-05 | 2017-08-01 | 东芝三菱电机产业系统株式会社 | Water tree test method and water tree experimental rig |
| CN109975672A (en) * | 2019-04-22 | 2019-07-05 | 中航宝胜海洋工程电缆有限公司 | One kind having relaying submarine optical fiber cable insulation life Index Assessment method |
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2010
- 2010-12-20 CN CN2010206677145U patent/CN201886100U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096031A (en) * | 2010-12-20 | 2011-06-15 | 无锡江南电缆有限公司 | Apparatus for testing ageing resistance and water tree resistance performances of medium voltage cable |
| CN103207140A (en) * | 2013-02-07 | 2013-07-17 | 华北电力科学研究院有限责任公司 | Device for wire comprehensive factor aging test |
| CN103278754A (en) * | 2013-05-15 | 2013-09-04 | 广州供电局有限公司 | Equipment and method for culturing cable water tree |
| CN103278754B (en) * | 2013-05-15 | 2015-05-20 | 广州供电局有限公司 | Equipment and method for culturing cable water tree |
| CN104215511A (en) * | 2013-05-29 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Cable environmental stress testing apparatus |
| CN104360200A (en) * | 2014-11-25 | 2015-02-18 | 四川明星电缆股份有限公司 | Test device and test method for cable resistant to high temperature and high pressure steam |
| CN107003349A (en) * | 2014-12-05 | 2017-08-01 | 东芝三菱电机产业系统株式会社 | Water tree test method and water tree experimental rig |
| CN109975672A (en) * | 2019-04-22 | 2019-07-05 | 中航宝胜海洋工程电缆有限公司 | One kind having relaying submarine optical fiber cable insulation life Index Assessment method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20181220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |