CN105911386A - Test method for verifying reliability of transition joint - Google Patents
Test method for verifying reliability of transition joint Download PDFInfo
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- CN105911386A CN105911386A CN201610248719.6A CN201610248719A CN105911386A CN 105911386 A CN105911386 A CN 105911386A CN 201610248719 A CN201610248719 A CN 201610248719A CN 105911386 A CN105911386 A CN 105911386A
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- 238000010998 test method Methods 0.000 title claims abstract description 22
- 230000007704 transition Effects 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 120
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims description 36
- 238000009413 insulation Methods 0.000 claims description 34
- 238000004132 cross linking Methods 0.000 claims description 30
- 238000013461 design Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 17
- 230000004087 circulation Effects 0.000 claims description 12
- 238000009863 impact test Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000003032 molecular docking Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract 2
- 241000393496 Electra Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 206010011906 Death Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
Abstract
The invention relates to a test method for verifying the reliability of a transition joint. Currently, there is no effective and accurate test method for the transition joint. The method comprises the following steps: installing a test loop and a simulation loop; determining a temperature control cable; carrying out a load cycle test of the test loop; carrying out a DC overlapping operation impulse voltage test of the test loop; carrying out a DC overlapping lightning impulse voltage test; and carrying out inspection after testing. According to the technical scheme of the invention, through the temperature monitoring of the simulation loop, the method achieves the accurate control of the wire temperature of the test loop, and improves the accuracy of the testing of the reliability of the transition joint. Moreover, the temperature control cable is determined, thereby facilitating the improvement of the testing safety, and enabling the test to be carried out smoothly.
Description
Technical field
The present invention relates to a kind of test method verifying transition Joint Reliability, a kind of test method verifying paper oil insulation cable and crosslinking insulated cable transit joint reliability.
Background technology
Eighties of last century, a large amount of use paper oil insulation electricity (extra large) cables in power transmission engineering international, domestic, but the development along with cross-linked polyethylene insulated cable technology, the advantage such as convenient for installation and maintenance with it, safe and reliable to operation progressively replaces paper oil insulation cable, and paper oil insulation cable the most progressively tends to end-of-life state.And at present the most still can produce various fault unavoidably at a large amount of paper oil insulation cables run, fault occur after face untethered can risk.
Paper oil insulation cable and crosslinking insulated cable transit joint are that the repairing of paper oil insulation cable work provides new solution route, once paper oil insulation cable breaks down, this joint available realizes the conversion of paper oil insulation cable and crosslinking insulated cable and couples, it is ensured that transmission line of electricity runs safely and reliably.
International conference on large HV electric systems (CIGRE) has worked out electrical test standard respectively for paper oil insulation cable and crosslinking insulated cable, standard ELECTRA 189b defines rated voltage 800kV and following paper oil insulation direct current cables and the test method of adnexa thereof, standard CIGRE TB 496 defines rated voltage 500kV and the test method of following extruded insulation direct current cables system, but still lacks the test method of system for paper oil insulation cable and crosslinking insulated cable transit joint.Paper oil insulation cable and crosslinking insulated cable are linked together composition compound cable system by transit joint, it is used alone paper oil insulation cable testing standard ELECTRA 189b or crosslinking insulated cable test standard CIGRE TB496 inadvisable, and comprehensively both content combined circuit practical operation situation should determine scientific and rational test method.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to carry out prior art improving and improving, it is provided that a kind of test method verifying transition Joint Reliability, to reach the purpose to transit joint authentic experiments；To this end, the present invention takes techniques below scheme.
A kind of test method verifying transition Joint Reliability, comprises the following steps:
1) installation test loop and analog loopback；By " dry outdoor terminal+crosslinking insulated cable+transit joint+paper oil insulation cable+transit joint+crosslinking insulated cable+dry outdoor terminal " mode installation test loop；Paper oil insulation cable and crosslinking insulated cable are docked composition analog loopback, the paper oil insulation cable of analog loopback and crosslinking insulated cable are respectively mounted multiple thermocouple to measure conductor temperature, by punching transformator to test loop cable and analog loopback electric cable heating, gather analog loopback conductor temperature simultaneously, gatherer process remaining, test loop and analog loop current value are equal, thus plays the effect of indirect Control experiment return cable temperature；
2) temperature control cable is determined；The selection principle of temperature control cable is: to analog loopback loading current, if the conductor steady temperature of paper oil insulation cable reaches its highest design load, and the conductor steady temperature of crosslinking insulated cable not yet reaches, then choose paper oil insulation cable as temperature control cable；Otherwise, crosslinking insulated cable is chosen；
3) test loop is carried out duty cycle test, in carrying out duty cycle test, by punching transformator to test loop cable and analog loopback electric cable heating, gather analog loopback conductor temperature simultaneously, gatherer process remaining, test loop and analog loop current value are equal to play the effect of indirect Control experiment return cable temperature；When cable run needs to carry out polarity inversion operation, carry out 24h duty cycle test, polarity inversion test and the test of 48h duty cycle successively, otherwise, carry out the test of 24h duty cycle successively and 48h duty cycle is tested；The test of 24h duty cycle and the test of 48h duty cycle are not less than the conductor maximum operating temperature design load of temperature control cable in setting time inner wire temperature；
4) test loop is carried out DC stacked operating impulse voltage test；
5) DC stacked lightning impulse voltage test is carried out；
6) post-test-inspection；Dissect cable, dismounting adnexa, with normal or correct defects of vision and check, as do not found affect the deterioration sign that cable system is properly functioning, then it is assumed that this transit joint, by examining, can be used for cable run and overhauls.
In the technical program, by the monitoring temperature to analog loopback, it is achieved the Wire temperature of test loop is accurately controlled, improve the test accuracy of transit joint reliability.And determine temperature control cable, be conducive to improving the safety of test, enable test to be smoothed out.
As improving further and supplementing technique scheme, present invention additionally comprises following additional technical feature.
In step 3) in, when cable run needs the test loop carrying out polarity inversion carry out duty cycle test, comprise the following steps:
3011) the 24h duty cycle test of 16 times altogether is carried out；Front 8 circulations carry out duty cycle positive polarity voltage test, and rear 8 circulations carry out duty cycle reverse voltage test；At at least last 2h of heating period, the conductor temperature of temperature control cable is not less than maximum operating temperature design load Tc,max；
3012) the 24h duty cycle+polarity inversion test of 8 times altogether is carried out；First, from the beginning of positive polarity voltage, polarity of voltage every 24h duty cycle inverts 6 times, and the most once reversion should be consistent with the dwell time of load current in 24h duty cycle, and polarity inversion should complete in 2min；At at least last 2h of heating period, the conductor temperature of temperature control cable is not less than maximum operating temperature design load Tc,max；
3013) the 48h duty cycle test of 3 times altogether is carried out；Apply positive polarity DC voltage+UT, the front 24h loading current of test heats every time, 24h natural cooling below；At at least last 18h of heating period, conductor temperature is not less than conductor maximum operating temperature design load T of temperature control cablec,max。
In step 3) in, cable run is made without the test loop of polarity inversion when carrying out duty cycle test, comprises the following steps:
3021) the 24h duty cycle test of 24 times altogether is carried out；The front 8h loading current of test heats every time, 16h natural cooling below；At at least last 2h of heating period, the conductor temperature of temperature control cable is not less than maximum operating temperature design load Tc,max；Front 12 circulations carry out duty cycle positive polarity voltage test, and applying voltage is+UT, rear 12 circulations carry out duty cycle reverse voltage test, and applying voltage is-UT；Allowing existence one section to have heat cycles between the duty cycle test of opposed polarity but be not added with the dead time of voltage, this dead time is the shortest for 24h；
3022) the 48h duty cycle test of 3 times altogether is carried out；Apply positive polarity DC voltage+UT, the front 24h loading current of test heats every time, 24h natural cooling below；At at least last 18h of heating period, conductor temperature is not less than conductor maximum operating temperature design load T of temperature control cablec,max。
Step 4) concrete steps include: first carry out negative polarity d. c superposition positive polarity operating impulse voltage test, before first impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-UoMore than 10h, keeping DC voltage, continuous 10 times of superposition positive polarity operating impulse voltage, the peak voltage ranges of superimposed rear waveform is+Up2(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage+UoMore than 10h, keep DC voltage, continuous 10 times of superposition negative polarity operating impulse voltage；Impact test interval is not less than 2min every time.
The waveform parameter of operation ripple requires: time to peak scope is 250 μ s (± 20%), and half peak value time range is 2500 μ s (± 60%).
Step 5) concrete steps include: first carrying out negative polarity d. c superposition positive polarity lightning impulse voltage test, before first impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-UoMore than 10h, keeping DC voltage, continuous 10 times of superposition positive polarity lightning impulse voltage, the peak voltage ranges of superimposed rear waveform is+Up1(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage+UoMore than 10h, keep DC voltage, continuous 10 times of superposition negative polarity lightning impulse voltage；Impact test interval is not less than 2min every time.
The waveform parameter of lightning wave requires: wave front time scope is 1～5 μ s, and half peak value time range is 50 μ s (± 20%), crosses rate of rushing less than 10%.
In step 1) installation test loop and during analog loopback, the length of every section of paper oil insulation cable and crosslinking insulated cable is at least 8m.
The paper oil insulation cable of analog loopback and crosslinking insulated cable are respectively mounted 2-4 thermocouple, and the installing space of neighboring thermocouple is not less than 0.5m.If multiple thermocouples can accurate thermometric, it is to avoid after single thermocouple lost efficacy, cause thermometric inaccurate situation to occur, and thermocouple is provided separately, many places sampling can avoid local temperature to affect.
Beneficial effect: in the technical program, by the monitoring temperature to analog loopback, it is achieved accurately control the Wire temperature of test loop, improves the test accuracy of transit joint reliability.And determine temperature control cable, be conducive to improving the safety of test, enable test to be smoothed out；Now to crosslinking insulated cable and the checking of paper oil insulation cable transition Joint Reliability, prove that it has the good electrical performance that can meet expection use condition, demonstrate crosslinking insulated cable feasibility paper oil insulation cable overhauls and the suitability from the angle of test.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Fig. 2 is installation test loop structure schematic diagram of the present invention.
Fig. 3 is analog loopback structure principle chart of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme is described in further detail；
As it is shown in figure 1, the present invention comprises the steps:
1) installation test loop and analog loopback.By " dry outdoor terminal 1+ crosslinking insulated cable 2+ transition connect 3+paper oil insulation cable 4+ transit joint 5+ crosslinking insulated cable 6+ dry outdoor terminal 7 " mode installation test loop, as shown in Figure 2, the length of every section of cable is at least 8m；Paper oil insulation cable 11 and crosslinking insulated cable 12 dock composition analog loopback, and as shown in Figure 3, every section of cable length is at least 8m, and every section of cable 3 thermocouples 13 of installation are to measure conductor temperature, and the installing space of thermocouple 13 should be not less than 0.5m.Analog loopback is for giving test loop cable and analog loopback electric cable heating by punching transformator 14, gather analog loopback conductor temperature simultaneously, gatherer process remaining, test loop and analog loop current value are equal, thus plays the effect of indirect Control experiment return cable temperature.
2) temperature control cable is determined.The selection principle of temperature control cable is: to analog loopback loading current, if the conductor steady temperature of paper oil insulation cable reaches its highest design load, and the conductor steady temperature of crosslinking insulated cable not yet reaches, then choose paper oil insulation cable as temperature control cable；Otherwise, crosslinking insulated cable is chosen.
3) judge that cable working line is the need of carrying out polarity inversion operation.If being made without polarity inversion, then perform step 4)；Otherwise, step 5 is performed)～6).
4) the 24h duty cycle test of 24 times altogether is carried out.The front 8h loading current of test heats every time, 16h natural cooling below；At at least last 2h of heating period, the conductor temperature of temperature control cable is not less than maximum operating temperature design load Tc,max.Front 12 circulations carry out duty cycle positive polarity voltage test, and applying voltage is+UT, rear 12 circulations carry out duty cycle reverse voltage test, and applying voltage is-UT.Allowing existence one section to have heat cycles between the duty cycle test of opposed polarity but be not added with the dead time of voltage, this dead time is the shortest for 24h.
5) the 24h duty cycle test of 16 times altogether is carried out.Front 8 circulations carry out duty cycle positive polarity voltage test, and rear 8 circulations carry out duty cycle reverse voltage test.Test heat condition and the step 4 often circulated) identical.
6) the 24h duty cycle+polarity inversion test of 8 times altogether is carried out.Test heat condition and the step 4 often circulated) identical.First from the beginning of positive polarity voltage, polarity of voltage every 24h duty cycle 6 mean allocation of reversion), the most once reversion should be consistent with the dwell time of load current in 24h duty cycle, and polarity inversion should complete in 2min.
7) the 48h duty cycle test of 3 times altogether is carried out.Apply positive polarity DC voltage+UT, the front 24h loading current of test heats every time, 24h natural cooling below；At at least last 18h of heating period, conductor temperature is not less than conductor maximum operating temperature design load T of temperature control cablec,max。
8) DC stacked operating impulse voltage test is carried out.First carrying out the test of negative polarity d. c superposition positive polarity operating impulse voltage, before first impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-UoMore than 10h, keeping DC voltage, continuous 10 times of superposition positive polarity operating impulse voltage, the crest voltage of superimposed rear waveform is+Up2(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage+UoMore than 10h, keeping DC voltage, continuous 10 times of superposition negative polarity operating impulse voltage, the crest voltage of superimposed rear waveform is-Up2(± 3%).Impact test interval requires not less than 2min, the waveform parameter of operation ripple every time: time to peak is 250 μ s (± 20%), and half time to peak is 2500 μ s (± 60%).
9) DC stacked lightning impulse voltage test is carried out.First carrying out negative polarity d. c superposition positive polarity lightning impulse voltage test, before first impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-UoMore than 10h, keeping DC voltage, continuous 10 times of superposition positive polarity lightning impulse voltage, the crest voltage of superimposed rear waveform is+Up1(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage+UoMore than 10h, keeping DC voltage, continuous 10 times of superposition negative polarity lightning impulse voltage, the crest voltage of superimposed rear waveform is-Up1(± 3%).Impact test interval requires not less than 2min, the waveform parameter of lightning wave every time: wave front time is 1～5 μ s, and half time to peak is 50 μ s (± 20%), crosses rate of rushing less than 10%.
10) post-test-inspection.Dissect cable, dismounting adnexa; with normal or correct defects of vision and check; contraction etc. as found no electrical degradation aspects, reveal, corrode or be harmful to affects the deterioration sign that cable system is properly functioning, then it is assumed that this transit joint, by examination, can be used for cable run maintenance.
The test method that a kind of shown in figure 1 above-3 verifies transition Joint Reliability is the specific embodiment of the present invention; substantive distinguishing features of the present invention and progress are embodied; can be according to actual use needs; under the enlightenment of the present invention; it is carried out the equivalent modifications of the aspect such as shape, structure, all at the row of protection domain of this programme.
Claims (9)
1. the test method verifying transition Joint Reliability, it is characterised in that comprise the following steps:
1) installation test loop and analog loopback；By " dry outdoor terminal+crosslinking insulated cable+transit joint+oilpaper is exhausted
Edge cable+transit joint+crosslinking insulated cable+dry outdoor terminal " mode installation test loop；By paper oil insulation cable
With crosslinking insulated cable docking composition analog loopback, the paper oil insulation cable of analog loopback and crosslinking insulated cable are respectively mounted
Multiple thermocouples are to measure conductor temperature, by punching transformator to test loop cable and analog loopback electric cable heating,
Gather analog loopback conductor temperature simultaneously, gatherer process remaining, test loop and analog loop current value are equal,
Thus play the effect of indirect Control experiment return cable temperature；
2) temperature control cable is determined；The selection principle of temperature control cable is: to analog loopback loading current, if paper oil insulation
The conductor steady temperature of cable reaches its highest design load, and the conductor steady temperature of crosslinking insulated cable not yet reaches,
Then choose paper oil insulation cable as temperature control cable；Otherwise, crosslinking insulated cable is chosen；
3) test loop is carried out duty cycle test, in carrying out duty cycle test, given by punching transformator
Test loop cable and analog loopback electric cable heating, gather analog loopback conductor temperature simultaneously, protect all the time in gatherer process
Hold test loop and analog loop current value is equal to play the effect of indirect Control experiment return cable temperature；Work as cable
When circuit needs to carry out polarity inversion operation, carry out 24h duty cycle test, polarity inversion test and 48h successively
Duty cycle is tested, and otherwise, carries out the test of 24h duty cycle successively and 48h duty cycle is tested；24h load
Cyclic test and the test of 48h duty cycle are not less than the conductor Gao Yun of temperature control cable in setting time inner wire temperature
Trip temperature design load；
4) test loop is carried out DC stacked operating impulse voltage test；
5) DC stacked lightning impulse voltage test is carried out；
6) post-test-inspection；Dissect cable, dismounting adnexa, with normally or correct defects of vision and check, as do not found
Affect the deterioration sign that cable system is properly functioning, then it is assumed that this transit joint by examination, can be used for cable run
Maintenance.
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
In step 3) in, when cable run needs the test loop carrying out polarity inversion carry out duty cycle test, including
Following steps:
3011) the 24h duty cycle test of 16 times altogether is carried out；Front 8 circulations carry out duty cycle positive polarity electricity
Pressure test, rear 8 circulations carry out duty cycle reverse voltage test；In at least last 2h of heating period, control
The conductor temperature of temperature cable is not less than maximum operating temperature design load Tc,max；
3012) the 24h duty cycle+polarity inversion test of 8 times altogether is carried out；First from the beginning of positive polarity voltage,
Polarity of voltage every 24h duty cycle inverts 6 times, and the most once reversion should be with the stopping of load current in 24h duty cycle
Only time consistency, polarity inversion should complete in 2min；At least last 2h of heating period, leading of temperature control cable
Temperature is not less than maximum operating temperature design load Tc,max；
3013) the 48h duty cycle test of 3 times altogether is carried out；Apply positive polarity DC voltage+UT, test every time
Front 24h loading current heat, 24h natural cooling below；At at least last 18h of heating period, lead
Temperature is not less than conductor maximum operating temperature design load T of temperature control cablec,max。
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
In step 3) in, cable run is made without the test loop of polarity inversion when carrying out duty cycle test, bag
Include following steps:
3021) the 24h duty cycle test of 24 times altogether is carried out；The front 8h loading current of test heats every time,
16h natural cooling below；At at least last 2h of heating period, the conductor temperature of temperature control cable is not less than the highest
Running temperature design load Tc,max；Front 12 circulations carry out duty cycle positive polarity voltage test, and applying voltage is+UT,
Rear 12 circulations carry out duty cycle reverse voltage test, and applying voltage is-UT；The duty cycle examination of opposed polarity
Allowing existence one section to have heat cycles between testing but be not added with the dead time of voltage, this dead time is the shortest for 24h；
3022) the 48h duty cycle test of 3 times altogether is carried out；Apply positive polarity DC voltage+UT, test every time
Front 24h loading current heat, 24h natural cooling below；At at least last 18h of heating period, lead
Temperature is not less than conductor maximum operating temperature design load T of temperature control cablec,max。
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
Step 4) concrete steps include: first carry out negative polarity d. c superposition positive polarity operating impulse voltage test, at head
Before individual impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-
UoMore than 10h, keep DC voltage, continuous 10 times of superposition positive polarity operating impulse voltage, superimposed rear waveform
Peak voltage ranges is+Up2(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage
+UoMore than 10h, keep DC voltage, continuous 10 times of superposition negative polarity operating impulse voltage；Impact test every time
Interval is not less than 2min.
A kind of test method verifying transition Joint Reliability the most according to claim 4, it is characterised in that:
The waveform parameter of operation ripple requires: time to peak scope is 250 μ s (± 20%), and half peak value time range is
2500 μ s (± 60%).
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
Step 5) concrete steps include: first carry out negative polarity d. c superposition positive polarity lightning impulse voltage test, at head
Before individual impact test, the conductor temperature of temperature control cable has reached to be not less than Tc,maxAnd born negative polarity d. c voltage-
UoMore than 10h, keep DC voltage, continuous 10 times of superposition positive polarity lightning impulse voltage, superimposed rear waveform
Peak voltage ranges is+Up1(± 3%)；Change the polarity of high voltage direct current generator subsequently, apply positive polarity DC voltage
+UoMore than 10h, keep DC voltage, continuous 10 times of superposition negative polarity lightning impulse voltage；Impact test every time
Interval is not less than 2min.
A kind of test method verifying transition Joint Reliability the most according to claim 6, it is characterised in that:
The waveform parameter of lightning wave requires: wave front time scope is 1～5 μ s, and half peak value time range is 50 μ s (± 20%),
Cross the rate of punching less than 10%.
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
In step 1) installation test loop and during analog loopback, the length of every section of paper oil insulation cable and crosslinking insulated cable is extremely
It is 8m less.
A kind of test method verifying transition Joint Reliability the most according to claim 1, it is characterised in that:
The paper oil insulation cable of analog loopback and crosslinking insulated cable are respectively mounted 2-4 thermocouple, the clipping room of neighboring thermocouple
Away from not less than 0.5m.
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| CN107228994A (en) * | 2017-04-17 | 2017-10-03 | 国网浙江省电力公司舟山供电公司 | A kind of high-voltage alternating cable duty cycle heating means |
| CN107228994B (en) * | 2017-04-17 | 2019-12-06 | 国网浙江省电力公司舟山供电公司 | High-voltage alternating-current cable load cyclic heating method |
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