CN202794367U - Electrothermal aging test device of cross-linked polyethylene cable accessory - Google Patents

Electrothermal aging test device of cross-linked polyethylene cable accessory Download PDF

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Publication number
CN202794367U
CN202794367U CN 201220337862 CN201220337862U CN202794367U CN 202794367 U CN202794367 U CN 202794367U CN 201220337862 CN201220337862 CN 201220337862 CN 201220337862 U CN201220337862 U CN 201220337862U CN 202794367 U CN202794367 U CN 202794367U
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CN
China
Prior art keywords
test
unit
pressure
cable
current
Prior art date
Application number
CN 201220337862
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Chinese (zh)
Inventor
黄华勇
魏长明
毛欣
杨可
刘明军
周凯
李旭涛
万利
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重庆市电力公司永川供电局
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Priority to CN 201220337862 priority Critical patent/CN202794367U/en
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Publication of CN202794367U publication Critical patent/CN202794367U/en

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Abstract

The utility model discloses an electrothermal aging test device of a cross-linked polyethylene cable accessory. The electrothermal aging test device of the cross-linked polyethylene cable accessory is characterized in that the test device comprises three functional parts of a high voltage introducing unit (1), a test circuit unit (2) and a large current generation unit (3); the high voltage generation unit (1) is connected with the test circuit unit (2), so that high voltage is introduced into a test circuit; the test circuit unit (2) passes through the large current generation unit (3), so that magnetic field coupling is formed and high current is generated; and the high voltage introducing unit and the large current generation unit work at the same time, so that the purposes of high voltage applying and large current passing in the test circuit unit are realized.

Description

The electrical-heating aging test device of twisted polyethylene cable annex
Technical field
The utility model relates to a kind of electrical-heating aging test device of twisted polyethylene cable annex, belongs to the operation maintenance technical field of cable.
Background technology
Twisted polyethylene cable relies on the reason such as easy of its superior electric, mechanical property and manufacturing process, installation process, has obtained being widely used in the Construction of Intercity Network process.In During Process of Long-term Operation, twisted polyethylene cable and annex insulation thereof occur aging gradually, and electric property descends, and finally causes insulation breakdown, has had a strong impact on the operation stability of electric system.Particularly cable accessory is because of the complicacy of this body structure, making and mounting process and service condition, becomes cable system comparatively weak link in actual motion.Usually impel the main cause of twisted polyethylene cable annex insulation ag(e)ing to be: the electricity under the high-voltage electric field is aging; The heat ageing that the conductor resistance loss brings; Mechanical stress damage in the production assembling process; Environmental baseline stress is such as UV radiation and moisture corrosion etc.Wherein, the electricity that cable accessory bears for a long time, heat synergy are to cause power cable that the main cause of insulation ag(e)ing occurs in real work.Therefore, the test unit that needs a kind of cable accessory electric heating jointly to wear out, electricity, the thermal stress of bearing when effectively the dummycable annex moves, and can test the test product under different temperatures, voltage type, the electric pressure, and obtain current waveform and local discharge signal data in the test specimen ageing process, and then analyze the insulation ag(e)ing process of cable accessory.
Because the restriction of testing transformer output capacity, aging equipment is when introducing high pressure by testing transformer, and inside is difficult to by being enough to the large electric current of Reality simulation load condition.Therefore, both at home and abroad the general mentality of designing of ageing test apparatus is for accelerating wearing out of insulating material, electrical equipment with means such as illumination, light current, outer heat, all is difficult to realize the aging acceleration for cable accessory its insulation under High Voltage electric field and heating effect of current acting in conjunction.
Summary of the invention:
The purpose of this utility model is the electrical-heating aging test device that the twisted polyethylene cable annex is provided for the deficiencies in the prior art, is characterized in the aging test under the electric heating synergy, the duty in the dummycable annex actual motion.When carrying out aging test, introduce high pressure by testing transformer; Produce large electric current by current transformer in device inside simultaneously, electricity, the thermal stress of bearing during the effective simulation test power cable actual motion of the two combination.
The purpose of this utility model is realized by following technical measures:
The electrical-heating aging test device of twisted polyethylene cable annex comprises high pressure introducing unit, unit, test loop and large electric current generating unit three functions part, and high pressure is introduced the unit and is connected with the unit, test loop, and high pressure is introduced in the test loop; The unit, test loop passes large electric current generating unit, forms magnetic Field Coupling, produces large electric current; High pressure introduces the unit and large electric current generating unit is worked simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to large electric current.
High pressure is introduced the unit and is comprised HT testing transformer; input pressure regulator one; the halo-free wire of protective resistance and high pressure; the HT testing transformer input end is connected with input pressure regulator one; change voltage type and the size of input end; correspondingly control the high-pressure side output voltage; the HT testing transformer high-voltage output end connects protective resistance; protective resistance is with the output current of limit assay transformer; transformer is carried out overcurrent protection; protective resistance is connected with halo-free wire; halo-free terminal place is smooth connection terminal, and the high pressure that testing transformer is produced is incorporated into the test loop.
The unit, test loop is " mouth " font metal loop that four sections twisted polyethylene cables are in series, comprise cable accessory test sample one and test sample two and stube cable one and stube cable two, two groups of cable accessory test samples one and test sample 21 ends are made the cable accessory that there is typical defective mounting inside, be convenient to study the insulation degradation process of typical case's defective mounting under electric heating stress when wearing out, the test sample other end inserts respectively in the cable Special test oil terminal, tests the use of oily terminal and will get rid of the introducing corona interference when measuring discharge signal of the sample other end; Stube cable one and stube cable two couple together the formation current return with two groups of test samples, stube cable two passes the current transformer center, form the coupling on the magnetic circuit, the connecting portion in the loop uses high-voltage terminal sub-connection, the corona discharge after preventing from pressurizeing.
Large electric current generating unit comprises straight-through current transformer and input pressure regulator two, straight-through current transformer input power-frequency voltage, current flowing in the primary coil, by electromagnetic induction principle generation current in the test loop, play the effect of current source, whole test loop is applied electric current, its input terminal voltage is inputted pressure regulator two controls, change the size of input voltage, correspondingly change the size of current that flows through in the winding of the former limit of CT, realize the control to the test loop electric current.
The utility model is compared with similar cable accessory ageing test apparatus, has following advantage:
(1) the utility model has been simulated cable and has been operated in the electric heating stress that bears under the high-voltage large current, the highfield that its mesohigh produces carries out electricity to cable and wears out, the Joule heat that large electric current produces when flowing through cable carries out heat ageing to cable, the two combine can the Reality simulation operating mode under the residing electric heating environment of cable accessory, accelerate the insulation ag(e)ing of XLPE cable annex.
(2) input of change testing transformer can be carried out the aging test of sample cable accessory under different voltage types, the electric pressure, the input of adjusting current transformer can be simulated the load fluctuation in the electric system, can obtain the local discharge signal of test specimen cable termination in ageing process by measuring unit simultaneously.
Description of drawings
Fig. 1 is XLPE cable annex electrical-heating aging test device synoptic diagram
1, high pressure is introduced the unit, and 2, the test loop, 3, large electric current generating unit, 4, HT testing transformer, 5, input pressure regulator one, 6, protective resistance, 7, the halo-free wire of high pressure, 8, current transformer, 9, input pressure regulator two.
Fig. 2 is XLPE cable annex electric heating ageing testing loop and signal measurement synoptic diagram
10, test sample one, 11, test sample two, 12, stube cable one, 13, stube cable two, 14, cable accessory, 15, test oily terminal, 16, reometer, 17, the temperature infrared imager, 18, the Rogowski coil, 19, the ultra-high frequency signal antenna.
Embodiment
Below by example the utility model is specifically described, but can not be interpreted as restriction to the utility model protection domain.
Embodiment
As shown in Figure 1, the structure of twisted polyethylene cable annex electrical-heating aging test device comprises the three functions part of high pressure introducing unit 1, test loop 2 and large electric current generating unit 3, high pressure is introduced unit 1 and is connected with unit, test loop 2, and high pressure is introduced in the test loop; Unit, test loop 2 passes large electric current generating unit 3, forms magnetic Field Coupling, produces large electric current; High pressure introduces the unit and large electric current generating unit is worked simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to large electric current.
As shown in Figure 1; high pressure is introduced unit 1 and is comprised HT testing transformer 4; input pressure regulator 5; the halo-free wire 7 of protective resistance 6 and high pressure; the HT testing transformer input end is connected with input pressure regulator 1; change voltage type and the size of input end; correspondingly control the high-pressure side output voltage; the testing transformer high-voltage output end connects protective resistance 6; protective resistance is water resistance; multiply by current-limiting resistance coefficient 1 Ω/V by the high pressure of testing transformer output and select its resistance; protective resistance is with the output current of limit assay transformer; transformer is carried out overcurrent protection; protective resistance is connected with halo-free wire 7; halo-free terminal place is smooth connection terminal, and the high pressure that testing transformer is produced is incorporated into the test loop.
As shown in Figure 2, unit, test loop 2 is " mouth " font metal loop that the YJV26/35 type twisted polyethylene cable of the about 120mm of four segment lengths is in series, wherein, comprise two groups of cable accessory test samples 1 and test sample 2 11 and stube cable 1 and stube cable 2 13, two groups of cable accessory test samples 1 and test sample 2 11 1 ends are made the cable accessory 14 that there is typical defective mounting inside, be convenient to study the insulation degradation process of typical case's defective mounting under electric heating stress when wearing out, the other end inserts respectively in the cable Special test oil terminal 15, tests the use of oily terminal and will get rid of the introducing corona interference when measuring discharge signal of the sample other end; Stube cable 1 and stube cable 2 13 couple together the formation current return with two groups of test samples, wherein stube cable 2 13 passes current transformer 8 centers, form the coupling on the magnetic circuit, the connecting portion in the loop uses the high-voltage terminal sub-connection, with the corona discharge after preventing from pressurizeing.
Large electric current generating unit 3 comprises straight-through current transformer 8 and input regulating device 9 thereof, straight-through current transformer input power-frequency voltage, current flowing in the primary coil, by the i.e. generation current in the test loop of electromagnetic induction principle, play the effect of current source, whole test loop is applied electric current, its input terminal voltage is subjected to pressure regulator 9 controls, change the size of input voltage, correspondingly change the size of current that flows through in the winding of the former limit of CT, and then realize the control to the test loop electric current.
In order to monitor the ageing state of twisted polyethylene cable annex ageing test apparatus, implementing when aging in the test loop, utilize multiple proving installation to consist of the signal testing unit, as shown in Figure 2, the signal testing unit comprises: the reometer 16 of measuring circuit working current, the temperature infrared imager 17 of monitoring cable attachment surface temperature rise, the Rogowski coil 18 of detection streamer annex shelf depreciation, the ultra-high frequency antenna 19 of detection streamer annex local discharge superhigh frequency signal.
During operation, regulate high-voltage test transformer input voltage, make its output rated high voltage.Regulate simultaneously the input voltage of current transformer, make the electric current that produces about 250A in the test loop.At this moment, twisted polyethylene cable annex electrical-heating aging test device begins to carry out work.

Claims (4)

1. the electrical-heating aging test device of a twisted polyethylene cable annex, it is characterized in that this test unit comprises high pressure introducing unit (1), unit, test loop (2) and large electric current generating unit (3) three functions part, high pressure is introduced unit (1) and is connected with unit, test loop (2), and high pressure is introduced in the test loop; Unit, test loop (2) passes large electric current generating unit (3), forms magnetic Field Coupling, produces large electric current; High pressure introduces the unit and large electric current generating unit is worked simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to large electric current.
2. the electrical-heating aging test device of twisted polyethylene cable annex as claimed in claim 1; it is characterized in that high pressure introducing unit (1) comprises HT testing transformer (4); input pressure regulator one (5); protective resistance (6) and the halo-free wire of high pressure (7); HT testing transformer plays high pressure and occurs; its input termination input pressure regulator one (5); change voltage type and the size of input end; correspondingly control the high-pressure side output voltage; the HT testing transformer high-pressure side connects protective resistance (6); protective resistance is with the output current of limit assay transformer; transformer is carried out overcurrent protection; protective resistance is connected with halo-free wire (7), and halo-free wire is incorporated into the test loop with the high pressure that testing transformer produces.
3. the electrical-heating aging test device of twisted polyethylene cable annex as claimed in claim 1, it is characterized in that unit, test loop (2) is " mouth " font metal loop that four sections twisted polyethylene cables are in series, comprise cable accessory test sample one (10) and test sample two (11) and stube cable one (12) and stube cable two (13), two groups of cable accessory test samples one and test sample 21 ends are made the cable accessory (14) that there is typical defective mounting inside, be convenient to study the insulation degradation process of typical case's defective mounting under electric heating stress when wearing out, the other end inserts in the cable Special test oil terminal (15), tests the use of oily terminal and will get rid of the introducing corona interference when measuring discharge signal of the sample other end; Stube cable one (12) and stube cable two (13) couple together the formation current return with two groups of test samples, stube cable two (13) passes the current transformer center, form the coupling on the magnetic circuit, connecting portion in the loop uses high-voltage terminal sub-connection, the corona discharge after preventing from pressurizeing.
4. the electrical-heating aging test device of twisted polyethylene cable annex as claimed in claim 1, it is characterized in that large electric current generating unit (3) comprises straight-through current transformer (8) and input pressure regulator two (9) thereof, straight-through current transformer input power-frequency voltage, current flowing in the primary coil, by electromagnetic induction principle generation current in the test loop, play the effect of current source, whole test loop is applied electric current, its input terminal voltage is subjected to pressure regulator two (9) controls, change the size of input voltage, correspondingly change the size of current that flows through in the winding of the former limit of CT, realize the control to the test loop electric current.
CN 201220337862 2012-07-12 2012-07-12 Electrothermal aging test device of cross-linked polyethylene cable accessory CN202794367U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103278752A (en) * 2013-04-28 2013-09-04 西安交通大学 Corona aging acceleration device and method for polymer insulating material
CN103592529A (en) * 2013-09-11 2014-02-19 天津学子电力设备科技有限公司 Method for evaluating insulation aging of XLPE (cross linked polyethylene) cable based on low-temperature pulse
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
CN104931835A (en) * 2015-06-25 2015-09-23 桂林理工大学 Stranded wire sample insulation accelerated aging life experimental method with electromagnetic acting force
CN104931834A (en) * 2015-06-25 2015-09-23 桂林理工大学 Electromagnetic acting force stress generating method for winding insulation sample accelerated aging life experiment
CN105717334A (en) * 2016-01-27 2016-06-29 大连理工大学 Simple high voltage and heavy current generation system for cables
CN104155541B (en) * 2014-07-15 2017-01-18 中国人民解放军信息工程大学 Electromagnetic and thermal stress complex environmental sensitivity testing system and method for microprocessor
CN108414876A (en) * 2018-03-21 2018-08-17 广东电网有限责任公司电力科学研究院 A kind of transformer insulated pilot system
CN111352011A (en) * 2020-05-21 2020-06-30 湖南省湘电试研技术有限公司 Tolerance characteristic test method, test circuit and design method of lightning protection insulator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103278752A (en) * 2013-04-28 2013-09-04 西安交通大学 Corona aging acceleration device and method for polymer insulating material
CN103592529A (en) * 2013-09-11 2014-02-19 天津学子电力设备科技有限公司 Method for evaluating insulation aging of XLPE (cross linked polyethylene) cable based on low-temperature pulse
CN104155541B (en) * 2014-07-15 2017-01-18 中国人民解放军信息工程大学 Electromagnetic and thermal stress complex environmental sensitivity testing system and method for microprocessor
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
CN104931835A (en) * 2015-06-25 2015-09-23 桂林理工大学 Stranded wire sample insulation accelerated aging life experimental method with electromagnetic acting force
CN104931834A (en) * 2015-06-25 2015-09-23 桂林理工大学 Electromagnetic acting force stress generating method for winding insulation sample accelerated aging life experiment
CN104931835B (en) * 2015-06-25 2017-12-12 桂林理工大学 The insulation accelerated aging life-span experimental method of twisted wire sample containing electromagnetic force
CN104931834B (en) * 2015-06-25 2017-12-12 桂林理工大学 Winding insulation sample accelerated life tests electromagnetic force stress production method
CN105717334A (en) * 2016-01-27 2016-06-29 大连理工大学 Simple high voltage and heavy current generation system for cables
CN108414876A (en) * 2018-03-21 2018-08-17 广东电网有限责任公司电力科学研究院 A kind of transformer insulated pilot system
CN111352011A (en) * 2020-05-21 2020-06-30 湖南省湘电试研技术有限公司 Tolerance characteristic test method, test circuit and design method of lightning protection insulator
CN111352011B (en) * 2020-05-21 2020-10-27 湖南省湘电试研技术有限公司 Tolerance characteristic test method, test circuit and design method of lightning protection insulator

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