CN107576897A - A kind of high-voltage cable insulating burn in test circuit and its method of testing - Google Patents
A kind of high-voltage cable insulating burn in test circuit and its method of testing Download PDFInfo
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- CN107576897A CN107576897A CN201710765577.5A CN201710765577A CN107576897A CN 107576897 A CN107576897 A CN 107576897A CN 201710765577 A CN201710765577 A CN 201710765577A CN 107576897 A CN107576897 A CN 107576897A
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Abstract
The invention discloses a kind of high-voltage cable insulating burn in test circuit and its method of testing, it is related to the exhausted technical field of measurement and test of high-tension cable, for prior art for HV CABLE SYSTEM, equipment volume required for resonance pressure-resistant and dielectric loss measurement is huge, field test setting up time is long, technical sophistication, difficulty of test is big, it is difficult to the technical problem of large-scale cable insulation test, using protective resistance, dc source, oscillograph, electronic switch, and computer, the oscillograph is attached and tested including the utensil such as the first oscillograph and the second oscillograph, test circuit structure provided by the invention is simple, it is easy to connect, it is easy to carry, with good Detection results and promotional value, method of testing provided by the invention is easily operated, the degree of accuracy is high, with good using effect and extensive market prospects.
Description
Technical field
The present invention relates to the exhausted technical field of measurement and test of high-tension cable, more particularly to a kind of high-voltage cable insulating burn in test circuit
And its method of testing.
Background technology
Insulation ag(e)ing refers to because of the long term of the factors such as electric field, temperature, mechanical force, humidity, surrounding environment, makes electrical equipment
The insulation phenomenon that quality is gradually reduced in the process of running, structure is gradually damaged.The speed of insulation ag(e)ing and insulation system, material
Material, manufacturing process, running environment, suffered voltage, load condition etc. have substantial connection, and insulation ag(e)ing ultimately results in failure of insulation,
Power equipment can not continue to run with.
In power supply-distribution system, the insulation ag(e)ing of cable is especially prominent.Water tree be exist in insulation moisture, electric stress and certain
A little risk factors, such as some microchannels developed into when impurity, projection, space charge or ion, in AC field and moisture
Under effect, water tree is a kind of phenomenon that insulating material of polymer is degraded, and under the collective effect of moisture and electric field, water tree is
Induce the main reason for high voltage power cable destroys.
For insulation ageing problems such as water trees, the detection method that foreign countries are reported at present is mainly with the medium under resonance potential
Based on loss measurement, also there is researcher to carry out ultralow frequency（0.1Hz）Dielectric loss measurement under voltage, but it is in midium voltage cable
Application it is more, for example, China is 6-35kV, foreign countries are 22kV cable.For high pressure（110kV）Cable system, resonance are resistance to
Equipment volume required for pressure and dielectric loss measurement is huge, and field test setting up time is long, and technical sophistication, difficulty of test is big, difficult
To realize large-scale cable insulation test.And the past also has many methods to report for water tree diagnosis：Such as AC superimposition method, 3
Subharmonic method, flip-flop method etc., these methods are mostly used for midium voltage cable, are such as used for high-tension cable, then technically still deposit
In certain difficulty；In addition, the few Site Detection data to actual motion cable of these traditional methods are reported, lack industry
The actual use experience at scene.Therefore, the insulation ag(e)ing diagnostic assessment technology for 110kV high-tension cables, grinding at home and abroad
It is seldom to study carefully report.
The content of the invention
The present invention provides a kind of high-voltage cable insulating burn in test circuit, to solve prior art for high-tension cable system
System, the equipment volume required for resonance pressure-resistant and dielectric loss measurement is huge, and field test setting up time is long, technical sophistication, test
Difficulty is big, it is difficult to realizes the technical problem of large-scale cable insulation test.
To solve the above problems, the present invention adopts the following technical scheme that realization：
A kind of high-voltage cable insulating burn in test circuit, including：Protective resistance, dc source, oscillograph, electronic switch and
Computer, the oscillograph include the first oscillograph and the second oscillograph；
Protective resistance one end is connected with DC power anode, and the protective resistance other end is connected with electronic switch the first terminal, electronics
Switch Second terminal is connected with the first oscilloscope signal end, and the first oscilloscope signal ground terminal is connected with DC power cathode, electronics
Switch common port is connected with tested cable core, and tested cable insulation is connected with the second oscilloscope signal end, the second oscillograph
Signal ground terminal is connected with DC power cathode；
First oscillograph and the second oscillograph are connected by data wire with computer.
Preferably, the oscillograph uses model（Tyke oscillograph MSO2024B）Oscillograph, the oscillograph can
5~10MHz and 20~800Hz current waveforms are recorded simultaneously.
Preferably, the resistance of the protective resistance is the k Ω of 10k Ω~20.
Preferably, the dc source is negative polarity d. c power supply, and the power supply maximum output voltage is 20kV.
Preferably, the electronic switch is by 40 IGCTs（KK800-18）, 20 string 2 and form electronic switch, should
Electronic switch operating voltage is more than 40kV, and the electronic switch maximum operation frequency is 20 kHz, maximum load current 50A.
Test circuit structure provided by the invention is simple, it is easy to connect, be easy to carry, there are good Detection results and push away
Wide value.
Present invention also offers a kind of method of testing based on above-mentioned high-voltage cable insulating burn in test circuit, including it is following
Step：
It is S1, tested cable is hanging；
S2, connecting test circuit；
S3, the common port for connecting electronic switch and the first terminal are given tested cable to charge and kept for a period of time；
S4, electronic switch common port is connected with Second terminal after completing step S3, cable is discharged；
S5, pass through oscillograph recording discharge data；
S6, using computer the data in oscillograph are read out and analyzed.
Preferably, charging voltage described in step S3 is below 20kV.
Preferably, kept for a period of time at least kept for 15 minutes described in step S3.
Preferably, discharge data described in step S5 is the high fdrequency component and low frequency component in discharge process.
Method of testing provided by the invention is easily operated, the degree of accuracy is high, has good using effect and extensive market
Prospect.
Brief description of the drawings
Fig. 1 is embodiment wiring schematic diagram provided by the invention；
Label in figure represents respectively：1：Protective resistance；2：Dc source；3：First oscillograph；4：Electronic switch；5：Subject electricity
Cable；6：Second oscillograph；7：Data wire；8：Computer.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is the present invention
Part of the embodiment, rather than whole embodiments.The embodiments of the invention being generally described and illustrated herein in the accompanying drawings
The scope for being not intended to limit claimed invention is described in detail, but is merely representative of the selected embodiment of the present invention.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
Fig. 1 is embodiment wiring schematic diagram provided by the invention, as shown in figure 1, a kind of high-voltage cable insulating burn-in test
Circuit, including：Protective resistance 1, dc source 2, oscillograph, electronic switch 4 and computer 8, the oscillograph include first
The oscillograph 6 of oscillograph 3 and second；
The one end of protective resistance 1 is connected with the positive pole of dc source 2, and the other end of protective resistance 1 is connected with the first terminal of electronic switch 4,
The Second terminal of electronic switch 4 is connected with the signal end of the first oscillograph 3, and the signal ground terminal of the first oscillograph 3 connects with the negative pole of dc source 2
Connecing, the common port of electronic switch 4 is connected with tested cable core, and tested cable insulation is connected with the signal end of the second oscillograph 6, the
The signal ground terminal of two oscillograph 6 is connected with the negative pole of dc source 2；
First oscillograph 3 and the second oscillograph 6 are connected by data wire 7 with computer 8；Wherein, the oscillograph uses model
For（Tyke oscillograph MSO2024B）Oscillograph, the oscillograph can record 5~10MHz and 20~800Hz electric currents simultaneously
Waveform；The resistance of the protective resistance 1 is the k Ω of 10k Ω~20；The dc source 2 is negative polarity d. c power supply 2, the power supply
Maximum output voltage is 20kV；The electronic switch 4 is by 40 IGCTs（KK800-18）, 20 string 2 and form electronic cutting
4 are closed, the operating voltage of electronic switch 4 is more than 40kV, and the maximum operation frequency of electronic switch 4 is 20 kHz, maximum load current
For 50A.
For above-mentioned high-voltage cable insulating burn in test circuit, its method of testing uses following steps：
Step S1, it is tested cable is hanging；
Step S2, connecting test circuit, according to Fig. 1 wiring；
Step S3, the common port and the first terminal for connecting electronic switch 4 charge and kept for a period of time to tested cable, charging electricity
Press as 20kV and at least kept for 15 minutes；
Step S4, the common port of electronic switch 4 is connected with Second terminal after completing step S3, cable is discharged；
Step S5, by oscillograph recording discharge data, including high fdrequency component and low frequency component in discharge process；
Step S6, the data in oscillograph are read out and analyzed using computer 8.
According to above-mentioned step, being tested the conductor of cable 5 first should be hanging, and cable appearance armouring is connected with oscillograph
After be grounded, then using negative polarity d. c power supply 2 to subject cable 5 charged, voltage is maintained at below 20kV, charging interval
Ensure more than 15 minutes.Charging process is known as polarization process, wherein protective resistance 1 can limit subject cable 5 puncture it is short
Caused short circuit current during road.After polarization is completed, electronic switch 4 is adjusted to be tested to the position of the short circuit dischange of cable 5, put
Electric process can use the attenuation process of 2 oscillograph recording depolarization currents of configuration, and oscillograph passes through data wire 7 and computer
8 are connected, and computer 8 can store the attenuation process of depolarization current amount, and filter out high fdrequency component therein and low
Frequency component is analyzed.
Above-mentioned 2 provisioned oscillographs, 5~10MHz and 20~800Hz current waveforms can be recorded simultaneously by being configured with
Module；Protective resistance 1 is between the k Ω of 10k Ω~20, it is ensured that maximum short circuit current is in below 2A；Negative polarity d. c electricity
Source 2, maximum output voltage 20kV；Its forward and reverse operating voltage of electronic switch 4 is in more than 40kV, the switching frequency upper limit
20kHz, maximum load current are 50A.
Claims (9)
- A kind of 1. high-voltage cable insulating burn in test circuit, it is characterised in that including：Protective resistance, dc source, oscillograph, electronic switch and computer, the oscillograph include the first oscillograph and the Two oscillographs；Protective resistance one end is connected with DC power anode, and the protective resistance other end is connected with electronic switch the first terminal, electronics Switch Second terminal is connected with the first oscilloscope signal end, and the first oscilloscope signal ground terminal is connected with DC power cathode, electronics Switch common port is connected with tested cable core, and tested cable insulation is connected with the second oscilloscope signal end, the second oscillograph Signal ground terminal is connected with DC power cathode；First oscillograph and the second oscillograph are connected by data wire with computer.
- 2. circuit according to claim 1, it is characterised in that：The oscillograph use model MSO2024B oscillograph, the oscillograph can record simultaneously 5~10MHz and 20~ 800Hz current waveforms.
- 3. circuit according to claim 1, it is characterised in that：The resistance of the protective resistance is the k Ω of 10k Ω~20.
- 4. circuit according to claim 1, it is characterised in that：The dc source is negative polarity d. c power supply, and the power supply maximum output voltage is 20kV.
- 5. circuit according to claim 1, it is characterised in that：The electronic switch is mainly by 40 thyristor groups into the electronic switch operating voltage is more than 40kV, and the electronic switch is most Big working frequency is 20 kHz, maximum load current 50A.
- A kind of 6. method of testing based on high-voltage cable insulating burn in test circuit described in claim 1, it is characterised in that including Following steps：It is S1, tested cable is hanging；S2, connecting test circuit；S3, the common port for connecting electronic switch and the first terminal are given tested cable to charge and kept for a period of time；S4, electronic switch common port is connected with Second terminal after completing step S3, cable is discharged；S5, pass through oscillograph recording discharge data；S6, using computer the data in oscillograph are read out and analyzed.
- 7. according to the method for claim 6, it is characterised in that：Charging voltage described in step S3 is below 20kV.
- 8. according to the method for claim 6, it is characterised in that：Kept for a period of time at least kept for 15 minutes described in step S3.
- 9. according to the method for claim 6, it is characterised in that：Discharge data described in step S5 is high fdrequency component and low frequency component in discharge process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710765577.5A CN107576897A (en) | 2017-08-30 | 2017-08-30 | A kind of high-voltage cable insulating burn in test circuit and its method of testing |
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| CN201710765577.5A CN107576897A (en) | 2017-08-30 | 2017-08-30 | A kind of high-voltage cable insulating burn in test circuit and its method of testing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108645452A (en) * | 2018-07-16 | 2018-10-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of aircraft electrical power supply system cable multi- scenarios method Aging Test device |
| CN109100621A (en) * | 2018-06-21 | 2018-12-28 | 南方电网科学研究院有限责任公司 | Burn analog detection method and its structure between cable outer semiconducting layer and aluminium sheath |
| CN111796169A (en) * | 2019-04-03 | 2020-10-20 | 株式会社电装 | Insulation inspection apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109100621A (en) * | 2018-06-21 | 2018-12-28 | 南方电网科学研究院有限责任公司 | Burn analog detection method and its structure between cable outer semiconducting layer and aluminium sheath |
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| CN111796169A (en) * | 2019-04-03 | 2020-10-20 | 株式会社电装 | Insulation inspection apparatus and method |
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