CN107390048A - Crosslinked polyethylene direct current submarine cable orthogonal stream current-carrying capacity contrast test method - Google Patents
Crosslinked polyethylene direct current submarine cable orthogonal stream current-carrying capacity contrast test method Download PDFInfo
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- CN107390048A CN107390048A CN201710486198.2A CN201710486198A CN107390048A CN 107390048 A CN107390048 A CN 107390048A CN 201710486198 A CN201710486198 A CN 201710486198A CN 107390048 A CN107390048 A CN 107390048A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
Crosslinked polyethylene direct current submarine cable orthogonal stream current-carrying capacity contrast test method, is related to submarine cable test method.Alternating current is conveyed with direct current extra large cable, risk be present, the feasibility and applicability of cross linked insulation extra large cable conveying alternating current can not be verified.The present invention comprises the following steps：1）Experimental enviroment is set；2）Temperature sensor is set；3）Install direct current current-carrying capacity test loop；4）Direct current cables current-carrying measurement；5）Install ac amount test loop；6）Ac cable current-carrying measurement；7）Post-test-inspection；8）Orthogonal stream current-carrying capacity contrasts.The technical program is by passing to alternating current to crosslinked polyetylene insulated direct current extra large cable and drawing ac amount, the electrical test method contrasted again with direct current current-carrying capacity, to verify the difference of alternating current-direct current current-carrying capacity, from the feasibility and applicability of the angle checking cross linked insulation extra large cable conveying alternating current of experiment, experimental implementation is simple, reliable results.
Description
Technical field
The present invention relates to submarine cable test method, especially crosslinked polyethylene direct current submarine cable it is straight-ac amount
Contrast test method.
Background technology
Crosslinked polyetylene insulated direct current submarine cable, so that its transmission distance is long, loss is small, convenient for installation and maintenance, operation is pacified
The advantage such as reliable entirely, the high voltage power transmission project being widely used in recent years between island-island, island-land.But current direct current transportation
The also non-mature of corollary equipment, the reliability of DC transmission system also need further to strengthen, under special circumstances, direct current extra large cable
Alternating current could be conveyed, whether direct current extra large cable ac amount is similar to direct current current-carrying capacity, and this is to ensureing that coastal island power supply can
By property, improving island power quality has with realistic meaning.
Exchanging extra large cable, because it is conveyed, the property of electric energy is different, and the difference of extra large cable insulating structure design is very big, together from direct current extra large cable
When alternating current because the factors such as kelvin effect in direct current cable caused by thermal field and direct current have very big difference, therefore alternating current current-carrying
It is incomplete same when amount is with conveying direct current.
International conference on large HV electric systems（CIGRE）Electrical test standard, standard CIGRE TB have been worked out for crosslinking insulated cable
496 define the test method of rated voltage 500kV and following extruded insulation direct current cables system, and IEC60840 is defined
The test method of 30kV-150kV cross-linked polyethylene insulated cables and requirement, but contrast the conveying exchange of cross linked insulation direct current extra large cable
Electricity and direct current ability simultaneously detect the test method that its current-carrying capacity still lacks system.Single cross linked insulation direct current cables experiment mark
Quasi- CIGRE TB 496 or ac cable testing standard IEC60840 have no relevant regulations, answer incorporation engineering practical operation situation true
Fixed scientific and rational test method.
The content of the invention
The technical problem to be solved in the present invention and the technical assignment proposed are prior art to be improved with being improved,
There is provided crosslinked polyethylene direct current submarine cable it is straight-ac amount contrast test method, it is defeated to reach checking cross linked insulation extra large cable
Send the feasibility and applicability purpose of alternating current.Therefore, the present invention takes following technical scheme.
Crosslinked polyethylene direct current submarine cable is straight-ac amount contrast test method, it is characterised by comprising the following steps：
1）Experimental enviroment is set：
Experimental situation temperature is maintained at 20 ± 15 DEG C, and well-ventilated；
2）Temperature sensor is set；
Take joint length to be more than 10 meters of crosslinked polyethylene direct current submarine cable, opened up in the knee of cable and multiple be deep to conductor
The aperture on surface, the interval of aperture are more than or equal to 0.8 meter, and the conductor temperature for measuring conductor temperature is inserted in aperture and is passed
Sensor forms multiple temperature measuring points；And skin temperature sensor, skin temperature sensor distance conductor temperature are set in cable skin
The distance of sensor is more than or equal to 0.8 meter；
3）Install direct current current-carrying capacity test loop；
Cable both ends install copper lug after, by direct-current strong current generator both positive and negative polarity export copper bar respectively with cable both ends copper nose
Sub close connection；
4）Direct current cables current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI C , test every time leading portion loadingI C Cable is heated, it is cold that back segment carries out nature
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max;As temperature is not up toT c,max, then improved in subsequent cycle experimentI C , repetitive cycling experiment；As temperature reaches
ArriveT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then reduced in next circulationI C , repeat
Cyclic test, until temperature reachesT c,maxUntill；DrawI CZ Afterwards, then multiple cyclic test is carried out, to obtain enough test datas
Verify current-carrying capacity accuracy；
5）Install ac amount test loop；
Cable both ends install copper lug after, by direct-current strong current generator both positive and negative polarity export copper bar respectively with cable both ends copper nose
Sub close connection；
6）Ac cable current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI A , test every time leading portion loadingI A Heated, followed by naturally cold
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max；As temperature is not up toT c,max, then improved in subsequent cycle experimentI A , repeat cyclic test；Such as temperature
ReachT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then reduced in next circulationI A , then
Repetitive cycling is tested, until temperature reachesT c,maxUntill；DrawI AZ Afterwards, then multiple cyclic test is carried out, to be tested enough
Data verification current-carrying capacity accuracy；
7）Post-test-inspection；
Extra large cable, dismounting annex are dissected after experiment, with normal or correct defects of vision and checked, judges whether deterioration mark occur
As；Deteriorating sign includes electrical degradation aspects, leakage, corrosion or harmful contraction；If deteriorate sign without appearance, then it is assumed that direct current current-carrying
Amount experiment, the experiment of ac amount are completed, obtained cable direct current current-carrying valueI CZ With cable ac valueI AZ Effectively；
Obtained cable direct current current-carrying value is thought if occurring deteriorating signI CZ With cable ac valueI AZ It is invalid, need again
Carry out the experiment of direct current current-carrying capacity, the experiment of ac amount；
8）Directly-ac amount contrast；
Judge cable direct current current-carrying valueI CZ With cable ac valueI AZ Whether difference is in setting range, if recognizing
Similar to direct current current-carrying capacity for direct current extra large cable ac amount, direct current extra large cable can convey alternating current；Otherwise it is assumed that direct current extra large cable is handed over
It is dissimilar with direct current current-carrying capacity to flow current-carrying capacity, stream extra large cable can not convey alternating current.
As further improving and supplementing to above-mentioned technical proposal, present invention additionally comprises following additional technical feature.
Further, in the experiment of direct current current-carrying capacity, first estimated to apply electric current according to extra large cable specificationI C , before testing every time
8h is loadedI C Heat cable, 16h natural coolings below；In the last 2h of heating period, the peak in 3 temperature measuring points is observed
Whether cable maximum operating temperature design load is reachedT c,max.As temperature is not up toT c,max, then improved in subsequent cycle experimentI C ,
Repeat this cyclic test in 24 hours；As temperature reachesT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then suitably reduced in next circulationI C , cyclic test in 24 hours is repeated, until temperature reachesT c,maxUntill.
Further, in the experiment of ac amount, first estimated to apply electric current according to extra large cable specificationI A , before testing every time
8h is loadedI A Heated, 16h natural coolings below；In the last 2h of heating period, the peak in 3 temperature measuring points is observed
Whether cable maximum operating temperature design load is reachedT c,max.As temperature is not up toT c,max, then improved in subsequent cycle experimentI A ,
Repeat cyclic test in 24 hours；As temperature reachesT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then reduced in next circulationI A , cyclic test in 24 hours is repeated, until temperature reachesT c,maxUntill.
Further, experiment successively carries out alternating current-direct current current-carrying capacity experiment using same test cable；By above step
DrawI AZ WithI CZ Afterwards, then respectively 12 24h cyclic tests are carried out, to obtain enough test data checking current-carrying capacity accuracys.
Beneficial effect：By passing to alternating current to crosslinked polyetylene insulated direct current extra large cable and drawing ac amount, then
The electrical test method contrasted with direct current current-carrying capacity, to verify the difference of alternating current-direct current current-carrying capacity, verified from the angle of experiment
Cross linked insulation extra large cable conveys the feasibility and applicability of alternating current, and experimental implementation is simple, reliable results.
Brief description of the drawings
Fig. 1 is flow chart of the present invention.
Fig. 2 is the DC experiment loop scheme of installation of the present invention.
Fig. 3 is AC Test Circuits scheme of installation of the present invention.
Fig. 4 is ac amount test loop scheme of installation of the present invention.
Embodiment
Technical scheme is described in further detail below in conjunction with Figure of description.
The present invention relates to test parameters and extra large cable design thermal parameter define and provided by table 1.
The test parameters of table 1, the definition of cable design thermal parameter
| Sequence number | Parameter | Definition |
| 1 | I A | Pass through electric current during alternating current |
| 2 | I C | Pass through electric current during direct current |
| 3 | I AZ | Cable ac value |
| 4 | I CZ | Cable direct current current-carrying value |
| 5 | T 1s | Cable skin temperature |
| 6 | T 1c 、T 2c 、T 3c | Cable conductor temperature |
| 7 | T c,max | Cable maximum operating temperature design load |
As shown in figure 1, crosslinked polyethylene direct current submarine cable it is straight-ac amount contrast test method, comprise the following steps：
1）Experimental enviroment is set：
Experimental situation temperature is maintained at 20 ± 15 DEG C, and well-ventilated；
2）Temperature sensor is set；
Take joint length to be more than 10 meters of crosslinked polyethylene direct current submarine cable, opened up in the knee of cable and multiple be deep to conductor
The aperture on surface, the interval of aperture are more than or equal to 0.8 meter, and the conductor temperature for measuring conductor temperature is inserted in aperture and is passed
Sensor forms multiple temperature measuring points；And skin temperature sensor, skin temperature sensor distance conductor temperature are set in cable skin
The distance of sensor is more than or equal to 0.8 meter；
3）Install direct current current-carrying capacity test loop；
For direct current current-carrying capacity test loop, such as accompanying drawing 3, selection is applied to the direct-current strong current generator of test cable, in electricity
After cable both ends installation copper lug, direct-current strong current generator both positive and negative polarity output copper bar is closely connected with cable both ends copper lug respectively
Connect；
4）Direct current cables current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI C , test every time leading portion loadingI C Cable is heated, it is cold that back segment carries out nature
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max;As temperature is not up toT c,max, then improved in subsequent cycle experimentI C , repetitive cycling experiment；As temperature reaches
ArriveT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then reduced in next circulationI C , repeat
Cyclic test, until temperature reachesT c,maxUntill；DrawI CZ Afterwards, then multiple cyclic test is carried out, to obtain enough test datas
Verify current-carrying capacity accuracy；
5）Install ac amount test loop；
For ac amount test loop, such as accompanying drawing 4, selection meets the punching transformer combination of test requirements document, experiment
After cable is put into punching transformer, field joint connecting line body both ends are made；
6）Ac cable current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI A , test every time leading portion loadingI A Heated, followed by naturally cold
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max；As temperature is not up toT c,max, then improved in subsequent cycle experimentI A , repeat cyclic test；Such as temperature
ReachT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then reduced in next circulationI A , then
Repetitive cycling is tested, until temperature reachesT c,maxUntill；DrawI AZ Afterwards, then multiple cyclic test is carried out, to be tested enough
Data verification current-carrying capacity accuracy；
7）Post-test-inspection；
Extra large cable, dismounting annex are dissected after experiment, with normal or correct defects of vision and checked, judges whether deterioration mark occur
As；Deteriorating sign includes electrical degradation aspects, leakage, corrosion or harmful contraction；If deteriorate sign without appearance, then it is assumed that direct current current-carrying
Amount experiment, the experiment of ac amount are completed, obtained cable direct current current-carrying valueI CZ With cable ac valueI AZ Effectively；
Obtained cable direct current current-carrying value is thought if occurring deteriorating signI CZ With cable ac valueI AZ It is invalid, need again
Carry out the experiment of direct current current-carrying capacity, the experiment of ac amount；
8）Directly-ac amount contrast；
Judge cable direct current current-carrying valueI CZ With cable ac valueI AZ Whether difference is in setting range, if recognizing
Similar to direct current current-carrying capacity for direct current extra large cable ac amount, direct current extra large cable can convey alternating current；Otherwise it is assumed that direct current extra large cable is handed over
It is dissimilar with direct current current-carrying capacity to flow current-carrying capacity, stream extra large cable can not convey alternating current.
By above flow, can be achieved to pass to alternating current and DC current current-carrying capacity area to crosslinked polyethylene direct current extra large cable
Other checking, it was demonstrated that direct current extra large cable passes through electric property during alternating current, and it is straight to demonstrate crosslinked polyethylene from the angle of experiment
Stream extra large cable passes through the feasibility and applicability of alternating current under special circumstances.
It should be understood that the present invention can also first carry out ac cable current-carrying measurement, then carry out direct current cables current-carrying capacity
Measure, both step 5）、6）With 3）、4）Location swap.
Ac cable current-carrying measurement and direct current cables current-carrying measurement are as shown in Figure 2.
In order to improve the accuracy of temperature detection, the damage to cable is reduced, avoids local temperature too high, is passed setting temperature
During sensor, 3 apertures for being deep to conductive surface, each hole separation 1m, arrangement of conductors temperature sensor are bored at cable bend
Form conductor temperature measuring point T1C、T2C、T3C, arrange that a skin temperature sensor forms epidermis temperature measuring point T in cable skin1S, it is with leading
Body examination warm spot interval 1m.
While in order to accelerate experiment, the accuracy of experiment is improved, using following technological means：
In the experiment of direct current current-carrying capacity, first estimated to apply electric current according to extra large cable specificationI C , test every time preceding 8h loadingI C Heating
Cable, 16h natural coolings below；In the last 2h of heating period, whether the peak observed in 3 temperature measuring points reaches cable
Maximum operating temperature design loadT c,max.As temperature is not up toT c,max, then improved in subsequent cycle experimentI C , it is 24 small to repeat this
When cyclic test；As temperature reachesT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then next
Suitably reduced in circulationI C , cyclic test in 24 hours is repeated, until temperature reachesT c,maxUntill.
In the experiment of ac amount, first estimated to apply electric current according to extra large cable specificationI A , test every time preceding 8h loadingI A Enter
Row heating, 16h natural coolings below；In the last 2h of heating period, observe whether the peak in 3 temperature measuring points reaches electricity
Cable maximum operating temperature design loadT c,max.As temperature is not up toT c,max, then improved in subsequent cycle experimentI A , it is small to repeat 24
When cyclic test；As temperature reachesT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then under
Reduced in individual circulationI A , cyclic test in 24 hours is repeated, until temperature reachesT c,maxUntill.
To improve the stability of experiment, experiment successively carries out alternating current-direct current current-carrying capacity experiment using same test cable；Through
Above step is crossed to drawI AZ WithI CZ Afterwards, then respectively 12 24h cyclic tests are carried out, to obtain enough test data checking current-carrying capacities
Accuracy.
Crosslinked polyethylene direct current submarine cable shown in figure 1 above -4 is straight-and ac amount contrast test method is this hair
Bright specific embodiment, substantive distinguishing features of the present invention and progress are embodied, can be according to the use needs of reality, in the present invention
Enlightenment under, carry out the equivalent modifications of shape, structure etc. to it, this programme protection domain row.
Claims (5)
1. crosslinked polyethylene direct current submarine cable is straight-ac amount contrast test method, it is characterised in that comprise the following steps：
1）Experimental enviroment is set：
Experimental situation temperature is maintained at 20 ± 15 DEG C, and well-ventilated；
2）Temperature sensor is set；
Take joint length to be more than 10 meters of crosslinked polyethylene direct current submarine cable, opened up in the knee of cable and multiple be deep to conductor
The aperture on surface, the interval of aperture are more than or equal to 0.8 meter, and the conductor temperature for measuring conductor temperature is inserted in aperture and is passed
Sensor forms multiple temperature measuring points；And skin temperature sensor, skin temperature sensor distance conductor temperature are set in cable skin
The distance of sensor is more than or equal to 0.8 meter；
3）Install direct current current-carrying capacity test loop；
Cable both ends install copper lug after, by direct-current strong current generator both positive and negative polarity export copper bar respectively with cable both ends copper nose
Sub close connection；
4）Direct current cables current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI C , test every time leading portion loadingI C Cable is heated, it is cold that back segment carries out nature
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max;As temperature is not up toT c,max, then improved in subsequent cycle experimentI C , repetitive cycling experiment；As temperature reaches
ArriveT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then reduced in next circulationI C , repeat
Cyclic test, until temperature reachesT c,maxUntill；DrawI CZ Afterwards, then multiple cyclic test is carried out, to obtain enough test datas
Verify current-carrying capacity accuracy；
5）Install ac amount test loop；
Selection meets the punching transformer of test requirements document, after test cable is put into punching transformer, makes field joint
Connecting line body both ends；
6）Ac cable current-carrying measurement；
First estimated to apply electric current according to extra large cable specificationI A , test every time leading portion loadingI A Heated, followed by naturally cold
But；In the final stage time of heating period, observe whether the peak in multiple temperature measuring points reaches cable highest operation temperature
Spend design loadT c,max；As temperature is not up toT c,max, then improved in subsequent cycle experimentI A , repeat cyclic test；Such as temperature
ReachT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then reduced in next circulationI A , then
Repetitive cycling is tested, until temperature reachesT c,maxUntill；DrawI AZ Afterwards, then multiple cyclic test is carried out, to be tested enough
Data verification current-carrying capacity accuracy；
7）Post-test-inspection；
Extra large cable, dismounting annex are dissected after experiment, with normal or correct defects of vision and checked, judges whether deterioration mark occur
As；Deteriorating sign includes electrical degradation aspects, leakage, corrosion or harmful contraction；If deteriorate sign without appearance, then it is assumed that direct current current-carrying
Amount experiment, the experiment of ac amount are completed, obtained cable direct current current-carrying valueI CZ With cable ac valueI AZ Effectively；
Obtained cable direct current current-carrying value is thought if occurring deteriorating signI CZ With cable ac valueI AZ It is invalid, need again
Carry out the experiment of direct current current-carrying capacity, the experiment of ac amount；
8）Directly-ac amount contrast；
Judge cable direct current current-carrying valueI CZ With cable ac valueI AZ Whether difference is in setting range, if recognizing
Similar to direct current current-carrying capacity for direct current extra large cable ac amount, direct current extra large cable can convey alternating current；Otherwise it is assumed that direct current extra large cable is handed over
It is dissimilar with direct current current-carrying capacity to flow current-carrying capacity, stream extra large cable can not convey alternating current.
2. crosslinked polyethylene direct current submarine cable according to claim 1 is straight-ac amount contrast test method, it is special
Sign is：When setting temperature sensor, 3 apertures for being deep to conductive surface, each hole separation 1m, cloth are bored at cable bend
Put conductor temperature sensor and form conductor temperature measuring point T1C、T2C、T3C, arrange that a skin temperature sensor forms table in cable skin
Skin temperature measuring point T1S, itself and conductor temperature measuring point interval 1m.
3. crosslinked polyethylene direct current submarine cable according to claim 2 is straight-ac amount contrast test method, it is special
Sign is：In the experiment of direct current current-carrying capacity, first estimated to apply electric current according to extra large cable specificationI C , test every time preceding 8h loadingI C Add
Electric heating cable, 16h natural coolings below；In the last 2h of heating period, observe whether the peak in 3 temperature measuring points reaches electricity
Cable maximum operating temperature design loadT c,max；
As temperature is not up toT c,max, then improved in subsequent cycle experimentI C , repeat this cyclic test in 24 hours；As temperature reaches
ArriveT c,max, then thisI C For cable direct current current-carrying valueI CZ ；As temperature exceedesT c,max, then suitably reduced in next circulationI C , then
Cyclic test in 24 hours is repeated, until temperature reachesT c,maxUntill.
4. crosslinked polyethylene direct current submarine cable according to claim 3 is straight-ac amount contrast test method, it is special
Sign is：In the experiment of ac amount, first estimated to apply electric current according to extra large cable specificationI A , test every time preceding 8h loadingI A Enter
Row heating, 16h natural coolings below；In the last 2h of heating period, observe whether the peak in 3 temperature measuring points reaches electricity
Cable maximum operating temperature design loadT c,max；
As temperature is not up toT c,max, then improved in subsequent cycle experimentI A , repeat cyclic test in 24 hours；As temperature reachesT c,max, then thisI A It is worth for cable ac valueI AZ ；As temperature exceedesT c,max, then reduced in next circulationI A , repeat
Cyclic test in 24 hours, until temperature reachesT c,maxUntill.
5. crosslinked polyethylene direct current submarine cable according to claim 4 is straight-ac amount contrast test method, it is special
Sign is：Experiment successively carries out alternating current-direct current current-carrying capacity experiment using same test cable；Drawn by above stepI AZ WithI CZ
Afterwards, then respectively 12 24h cyclic tests are carried out, to obtain enough test data checking current-carrying capacity accuracys.
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| CN201710486198.2A CN107390048B (en) | 2017-06-23 | 2017-06-23 | direct-alternating current carrying capacity contrast test method for crosslinked polyethylene direct-current submarine cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589065A (en) * | 2021-06-22 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and device for testing current carrying capacity of directly-buried cable |
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| CN102361322A (en) * | 2011-07-20 | 2012-02-22 | 西安交通大学 | Technology determination method for changing crosslinked polyethylene cable alternating current line into direct current operation |
| CN102778627A (en) * | 2012-08-16 | 2012-11-14 | 广州供电局有限公司 | Method and device for determining current-carrying capacity of cable |
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2017
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| US20050264911A1 (en) * | 2003-11-26 | 2005-12-01 | Masahiro Sone | Storage control device and control method therefor |
| CN101692110A (en) * | 2009-09-29 | 2010-04-07 | 广东电网公司广州供电局 | Method for determining combined insulation thermal resistance of cable and method for calculating current-carrying capacity of cable |
| CN102323496A (en) * | 2011-05-31 | 2012-01-18 | 广东电网公司广州供电局 | System for monitoring current-carrying capacity of cable conductor and method |
| CN102361322A (en) * | 2011-07-20 | 2012-02-22 | 西安交通大学 | Technology determination method for changing crosslinked polyethylene cable alternating current line into direct current operation |
| CN102778627A (en) * | 2012-08-16 | 2012-11-14 | 广州供电局有限公司 | Method and device for determining current-carrying capacity of cable |
| CN103913652A (en) * | 2014-03-10 | 2014-07-09 | 华南理工大学 | Steady-state iteration measuring method for current-carrying capacity of cable |
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| CN113589065A (en) * | 2021-06-22 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and device for testing current carrying capacity of directly-buried cable |
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| CN107390048B (en) | 2019-12-06 |
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