GB 12527-1990 Overhead insulated cables with rated voltage I kV and below
Some standard content:
National Standard of the People's Republic of China
Aerial insulated cables of rated voltages up to and including 1 kv This standard adopts the International Electrotechnical Commission IEC502 and IEC227. 1 Subject content and scope of application||tt| |GB12527-90
This standard specifies the technical requirements, test methods, acceptance rules and packaging of overhead insulated cables with AC rated voltage 1kV and below. This standard applies to copper core, aluminum core or aluminum alloy core weather-resistant polyvinyl chloride (PVC for short), polyethylene (PE for short) and cross-linked polyethylene for overhead power lines with AC rated voltage Uo/U of 0.6/1kV and below. (XLPE for short) insulated overhead cable. 2 Reference standards
GB2900.10 Electrical terminology Wires and cables GB2951
Test methods for mechanical and physical properties of wires and cables GB3048
Test methods for electrical properties of wires and cables
GB3953||tt ||GB3955
GB3957
GB4005
GB4909
GB6995
GB7893
Electrical round copper wire
Electrician round aluminum Wire
Power cable copper and aluminum conductive core
Wire and cable delivery tray
Bare wire test method
Wire and cable identification mark method
Electrician circle Aluminum wire and round aluminum alloy wire
3 terminology, symbols and codes
3.1 Terminology
Aluminum magnesium silicon alloy round wire
3.1.1 Terminology of this standard The interpretation of GB2900 is adopted. 3.1.2 Rated voltage
Rated voltage is the reference voltage used for cable design and electrical performance testing, expressed in Uo/U, and the unit is kV. The effective value of the voltage between any main insulated conductor and "ground" (metal shield, metal jacket or surrounding medium). U.
The effective value of the voltage between any two phase conductors of a multi-core (bundled) cable or single-core cable system. U
When the cable is used in an AC system, the rated voltage of the cable should be at least equal to the rated voltage of the system. When used in a DC system, the rated voltage of the system should not be greater than 1.5 times the rated voltage of the cable. The operating voltage of the system should not be greater than 1.1 times the rated voltage of the system. 3.2 Symbols and codes
3.2.1 Series code
JK
3.2.2 Material characteristics code
Copper conductor
Omitted
Country Approved by the Technical Supervision Bureau on 1990-11-07 for implementation on 1991-08-01
Aluminum conductor L
Aluminum alloy conductor: LH
Polyvinyl chloride insulation
Polyethylene insulation
Cross-linked polyethylene insulation
3.3 Product representation method
V
YJ
GB12527-90
3.3.1 Product model number , specifications and numbers of this standard. 3.3.2 Example:
Rated voltage 0.6/1kV copper core PVC insulated overhead cable, single core, nominal cross-section 70mm, expressed as: a.
JKV-0.6/11X70GB12527—90
Rated voltage 0.6/1kV aluminum alloy core cross-linked ethylene insulated overhead cable, 4 cores, nominal cross-section 16mm2, expressed as: b.
JKLHYJ-0.6/14X16GB12527—90||tt| |Rated voltage 0.6/1kV aluminum core polyethylene insulated overhead cable, 4 cores, of which the main core is 3 cores, and its nominal cross-section is c.
35mm2; the load-bearing neutral conductor is an aluminum alloy core, its nominal The cross-section is 50mm, expressed as: JKLY-0.6/13X35+1×50GB12527-904 Usage characteristics
4.1 Rated voltage U/U is 0.6/1kV.
4.2 The long-term allowable operating temperature of cable conductors: PVC and polyethylene insulation should not exceed 70°C; cross-linked polyethylene insulation should not exceed 90°C. 4.3 The laying temperature of cables should not be lower than -20℃. 4.4 Allowable bending radius of cable:
If the outer diameter (D) of the cable is less than 25mm, it should not be less than 4D. For cables with an outer diameter (D) of 25mm and above, it should not be less than 6D. 5 Model
The models of overhead insulated cables are shown in Table 1.
Table 1
Type
JKV-0.6/1
JKLV-0.6/1
No.
JKLHV-0.6/1| |tt||JKY-0.6/1
JKLY-0.6/1
JKLHY-0.6/1
JKYJ-0.6/1
JKLYJ-0.6/1| |tt||JKLHYJ-0.6/1
6 specifications
Name
Title
Rated voltage 0.6/1kV copper core polyethylene insulated overhead cable rated voltage 0.6/ 1kV aluminum core polyethylene insulated overhead cable rated voltage 0.6/1kV aluminum alloy core polyvinyl chloride insulated overhead cable rated voltage 0.6/1kV copper core polyethylene insulated overhead cable rated voltage 0.6/1kV aluminum core polyethylene insulated overhead cable rated voltage 0.6 /1kV aluminum alloy core polyethylene insulated overhead cable rated voltage 0.6/1V copper core cross-linked polyethylene insulated overhead cable rated voltage 0.6/1kV aluminum core cross-linked polyethylene insulated overhead cable rated voltage 0.6/1kV aluminum alloy core cross-linked polyethylene Insulated overhead cables The specifications of overhead insulated cables are shown in Table 2.
Main uses
Overhead fixed laying, lead lines, etc.
Type
No.
JKV, JKLV, JKLHV, JKY, JKLY, JKLHY, JKYJ , JKLYJJKLHYJ
JKLVJKLYJKLYJ
GB12527-90
Table 2
number of cores
1
2, 4
3 +K
Note: 1)K is a neutral conductor with load. According to the requirements of the power distribution project, any cross section can be selected to match the main wire core. 7 Technical Requirements
7.1
The structure and technical parameters of overhead insulated cables are shown in Table 3. Table 3
least among conductors
conductor
nominal
section
mm2
10
16||tt ||25
35
50
70
95
120
150
185
240
Number of single wires
Pressed circle
Aluminum core,
Copper core
6
6
6
6
6
12
15
18
18
30
34| |tt||7.2 conductor
aluminum alloy core
6
6
6
6
6
12
15
15
15
30
30
Conductor
Outer diameter
Single core Electrical
Insulation
Nominal
Cable average
(reference value) thickness
mm
3.8
4.8| |tt||6.0
7.0
8.4
10.0
11.6
13.0
14.6
16.2||tt ||18.4
mm
1.0
1.2
1.2
1.4
1.4
1.4
1.6
1.6
1.8
2.0
2.2
outer
upper
diameter
limit| |tt||mm
6.5
8.0
9.4
11.0
12.3
14.1
16.5||tt ||18.1
20.2
22.5
25.6
20℃C时密体电影
不这个Q/km
铜芯||tt ||硬铜
1.906
1.198
0.749
0.540
0.399
0.276
0.199||tt| |0.158
0.128
0.1021
0.0777
运铜
1.83
1.15
0.727
铁芯
银合
金芯
3.574
3.08
1.91
2.217
rated voltage0.6/1kV
性称图像，mm2
16~240
10~120
10~120
rated工作温
度时minimum绝
缘电影
M2·km
70℃
0.0067
0.0065
1.20
1.393||tt ||0.0054
0.5240.868
0.387
0.268
0.641
007
0.744
0.0054||tt ||0.0046
0.0040
514
0.1930.3200.3710.0039
0.1530.253
0.294
0.0035
0.2060.2390.0035
0.1640.1900.0035
0.1250.1450.003 4
90℃
0.67
0.65
0.54
0.54
0.46
0.40
0.39
0.35
0.35
0.35
0.34
cable断力
N
硬铜芯
3471
5486
8465
11731
16502||tt| |23461
31759
39911
49505
61846
金芯
银合
金芯||tt ||16502514
2517
4022
37626284
51778800
7011
12569
1035417596
1372723880.中国TY型圆铝线。 多芯通话的铝圆圆铝线该可以下载TR型圆圆铝线。
7.2.1.2 Aluminum conductive wire芯应是是是以GB3955的LY9型H9 state硬圆量线。 7.2.1.3 Aluminum alloy conductive wire 芯合可以GB7893的LHA型orLHB型重合合圆线。 Conductor shall use tightly pressed circularly twisted copper, aluminum or aluminum alloy conductor wire, the distance when the conductor is twisted比、电向应歌术GB3957的7.2.2
requirements。
7.2.3 single wire in the conductor is 7根及使用均不可有有电影，单线中地7根可以有电影。但成品电视电视The distance between the two connectors shall not be less than 15m。7.2.4 Conductor body surface 应光洁、无油污、无时时发的毛刺、萶装的得起或或裂的single wire。7.2.5 Conductor body structure应电影表3的设计。7.3 Insulation
GB12527—90
7.3.1 Insulation adopt耐候型的聚四质(PVC),聚质(PE),交联聚质(XLPE) 7.3.2 Insulation should be tightly squeezed out on the conductor body, the insulation surface should be flat, 色泽 even.值。 其最薄夛 thickness 应不可以90%-0.1mm of the standard value。
7.3.4 两芯及电影电影的电视上上有可以下载相序的得出电视，且安全安全。A相的一根凸芡，B相的二根凸芡，C相的三根凸芡。
7.3.5 电影的电影节节
7.3.5.1 相的的电影的电影节节如表4 这个、7.3.5.2
序号
1
1.1
1.2
1.3
2
电影线芯应按GB3048.9的实施，通过火花电影，使用电影的电视的剧情的的结果。表4
长
报张开动和断裂伸长率
去带
抗张开动
断裂伸长率
水水玻箱治疗正视
抗式设计：水水
时间
test result：| |tt||抗张开动
性性环
断裂伸长率
性性率
可以地图治疗方法
性时时间||tt| |电影电影：
a）0～1008h
报张开动性性环
断裂伸长率性性率
b)504~1008h
抗张开动性性率
断裂伸长率性总率
热失重歌机
电影水水
目
minimum
minimum| |tt||minimum
minimum
minimum
minimum
minimum
minimum
minimum
minimum||tt ||nīdoes
MPa
%
℃
h
MPa
%
%
%
力
%
%
%
%
℃
PVC
结果设计
PE
12.5
150
80±2
168
12.5
±20
150
±20
1008
±30
±30
±15
±15
80±2
10.0
300
100±2
240
300
1008
±30
±30
±15
±15
XLPE
12.5
200
135±3
168|| tt||±25
±25
1008
±30
±30
±15
±15||tt| |序号
3
8
8.1
8.2
9
10
Processing time
Weight loss
Anti-cracking test
Processing temperature
Processing time|| tt||Test results
High temperature pressure test
Processing temperature
Processing time
Deformation rate
Low temperature winding test
Processing temperature
Test results
Low temperature tensile test
Processing temperature
Elongation at break
Low temperature impact test
Processing temperature||tt ||Test results
Water absorption test
Voltage method
Temperature
Time
Test results
Gravity method
Temperature
Time
Water absorption
Shrinkage test
Temperature
Time
Allowable shrinkage
Thermal extension test|| tt||Temperature
Item
GB12527—90
Continued Table 4
Item
Maximum
Maximum
Minimum
Max
Max
Unit
h
mg/cm2
C
h
℃
h
%
℃
c
%
'℃
℃
h| |tt||℃
h
mg/cm2
c
%
℃
PVC
168| |tt||2.0
Performance requirements
PE
150±3
1
No cracking
80±2||tt ||4(6)
50
-35
No cracking
-35
20
-35||tt| |No cracking
70±2
240
No breakdown
85±2
336
100±3||tt ||1
4
XLPE
85±2
336
1
130±3
200± 3
Serial number
11
7.4 Stranding
Loading time
Mechanical stress
Elongation under load
Item
Permanent elongation after cooling
Melt index
Allowable value before aging
GB12527-90
Continued Table 4
Item
Max
Max
Max
Single
bit
min
N/cm2
%
%
g/10min
PVc
Sex
Ability
To
PE
0.4
Seeking
They should be twisted into bundles in the forward phase sequence of A, B, and C. The twisting direction is right, and the twisting pitch should not be greater than 25 times the calculated twisted outer diameter of the insulated wire core.
7.5 Finished cables
7.5.1 The outer diameter and structural dimensions of the cable should comply with Table 3. The single wire diameter of the conductor is not assessed. 7.5.2 The breaking force of the cable should comply with the requirements in Table 3. 7.5.3 The conductor resistance of the cable should comply with the requirements in Table 3. 7..5.4 The cable should be able to withstand the 3500V, 1min voltage test. The single-core cable should be immersed in room temperature water (with additional electrode) for 1 hour. Note: Spark testing of single-core cables is under consideration. 7.5.5 The insulation resistance of cables should comply with the requirements in Table 3. The sample should be removed from the cable that has passed the voltage test specified in Article 7.5.4, with a length of not less than 10m, immersed in water with the rated operating temperature of the cable ±2°C, and tested after 2 hours. 7.5.6 The mechanical and physical properties of cable insulation should comply with the requirements in Table 4. 7.5.7 The non-flammability of cables shall comply with the provisions of GB2951.19. 7.5.8 Cables should be tested for wear resistance according to the method specified in Appendix B. The wear resistance of the cable should be no less than 20,000 times. The load suspended at the end of the sample during the test should comply with the following regulations: Cables with conductor nominal cross-section 16mm2 and above
Cables with conductor nominal cross-section below 16mm2
7.5.9 mark
50N
30N
7.5.9.1 The surface of the finished cable should have the manufacturer's name, model, or the manufacturer's name, model, cross-section and voltage continuously marked. The logo should be clear, easily legible and scratch-resistant.
7.5.9.2 The logo can be printed or embossed on the surface of the cable using a concave die. The distance between the end of a complete logo and the beginning of the next logo should not exceed 500mm. 7.5.9.3 The wipe resistance performance of ink printed signs shall comply with the provisions of GB6995. 7.5.10 Delivery length
The delivery length of the cable shall be stipulated in the agreement between the two parties. The length measurement error should not exceed ±0.5%. 8 Test methods
Products are tested according to the items and test methods specified in Table 5. 1
serial number
1.1
1.2
1.3
2
3
4
5| |tt||6
6.1
6.2
6.3
6.4
6.5
6.6
6.7||tt ||6.8
6.9
6.9.1
6.9.2
6.10
6.11
6.12
7| |tt||8
9
10
Test items
Structural dimensions
Conductor
Insulation thickness
Cable Outer diameter
Cable breaking force
Conductor resistance
Voltage test
Insulation resistance
Insulation mechanical and physical properties
Air oven aging test
Artificial climate aging test
Thermal weight loss
Anti-cracking
High temperature pressure
Low temperature winding
Low temperature stretching||tt| |Low temperature impact
Water absorption test
Voltage method
Gravity method
Shrinkage test
Thermal extension
Melt index
Non-flame retardant performance
Abrasion resistance
Wipe resistance of printed marks
Delivery length
9 Acceptance rules
GB12527-90||tt| |Table 5
Test type
Provision number
7.1,7.2
7.1,7.3.3
7.1,7.5.1
7.1,7.5.2
7.1,7.5.3
7.5.4
7.1,7.5.5
7.5.6
7.5.7| |tt||7.5.8
7.5.9
7.5.10
JKV
JKLV
JKLHV
Ts||tt ||TS
TS
Ts
TR
TR
TS
TS
TS
TS
Ts
TS
TS
TS
TS
TS
TS
TS| |tt||Ts
R
JKY
JKLY
JKLHY
TS
TS
TS||tt ||Ts
TR
TR
TS
Ts
TS
TS
TS
T.S
TS
Ts
R
JKYJ
JKLYJ
JKLHYJ
TS
TS| |tt||TS
TS
TR
TR
TS
TS
TS
TS||tt ||TS
TS
TS
R
Test method
GB4909.2
GB3957
GB2951.2
GB2951.4
GB4909.3
GB3048.4
GB3048.8
GB3048.5 or 6
GB2951.5 or 7
Appendix A
GB2951.10
GB2951.31
GB2951.16
GB2951.12
GB2951.13| |tt||GB2951.14
GB2951.30
GB2951.29
GB2951.33
GB2951.18
GB3682
GB2951.19 | | tt | | Appendix B | | tt | Quality inspection certificate. 9.2 Products should be inspected and accepted according to specified tests. The definitions of type test (T), sampling test (S) and routine test (R) are as specified in GB2951.1. 9.3 The sampling quantity of each batch shall be determined by agreement between the two parties. If the user does not request it, it will be specified by the manufacturer. GB12527-90
When the test results of the sampling items are unqualified, the sampling should be doubled. If the unqualified items still fail the second test, 100% inspection shall be carried out.
9.4 If there is any dispute between the manufacturer and the user regarding acceptance, an arbitration test shall be conducted by an authoritative organization recognized by both parties. 10 Packaging
10.1 Cables shall be delivered in reels, neatly wound, and properly packaged. It should comply with the provisions of GB 4005. 10.2 The ends of the cables should be sealed to prevent water ingress and moisture. 10.3 Each cable should be attached with a label indicating: manufacturer name;
h.
d.||tt ||e
Model and specifications;
Rated voltage; kv;
Length; m
Weight: kg:
Manufacturing year and month;| |tt||8 indicates the correct rotation direction of the reel;
h. standard encdoing.
A1 scope of application
GB12527-90
Appendix A
Artificial climate aging test method (xenon lamp method) (supplement)
This test method is applicable Determination of artificial weathering aging performance of polyvinyl chloride (PVC), polyethylene (PE), and cross-linked polyethylene (XLPE) overhead insulated cables.
A2 test equipment
A2.1 xenon lamp climate aging chamber
The rack rotates once per minute, the box temperature is 55±2°C, and the relative humidity is (85±5)%. A2.1.2 The water spray should be clean tap water, the water spray pressure is 0.12~0.15MPa, the inner diameter of the water spray nozzle is Φ0.8mm, water spraying, lighting, and lighting alone are carried out within 18 minutes, and periodically. A2.2 Ozone generating device
A2.3 Industrial sulfur dioxidebzxZ.net
A2.4-40℃ freezer
A2.5 tensile testing machine indication accuracy, from the dials at all levels Above 1/10 range, but not less than 4% of the maximum load, ±1%. A3 Sample Preparation
Cut a sample section of sufficient length from the end of 500mm of the cable under test to be used for three sets of tests to determine the effective performance. Sample sections with mechanical damage cannot be used as test specimens for testing.
The first set of specimens should be at least 5 for original performance measurement. The second set of samples should be at least 5 for performance measurement after 0 to 1008 hours of photoaging. There should be at least 5 samples in the third group for performance measurement after 5041008h photoaging. A4 test steps
A4.1 The first group of samples should be stored in a cool and dry place, the second and third groups of samples should be placed in a xenon lamp climate chamber for testing, and the third group of samples should be tested 504 hours after the start of the test Then put it in.
A4.2 test cycle: The entire test lasts for 6 weeks, and each week is a cycle. The test is conducted according to the conditions of A2.1.1 and A2.1.2 for 6 days. The seventh level is adjusted as follows a and b. , test under the conditions specified in c. Adjustment a Aging sample should be placed for one day in an environment with a temperature of 40±3°C, containing 0.067% sulfur dioxide and an ozone concentration greater than 20×10-6.
Adjustment b: The aging sample should be moved from the environment of A2.1.1 and A2.1.2 to a freezing room of -25±2℃, and conduct cold and hot tests. A total of three times, 2h each time, and two thermal shocks The interval should be equal to or greater than 1h. Adjustment c: The aging sample should be placed in a container at 40±3°C and containing 0.067% sulfur dioxide saturated humidity for 8 hours. Then, open the container and place it in the laboratory environment for 16 hours.
A4.3 After the specified aging time, take out the sample and store it at ambient temperature for at least 16 hours. Compare the appearance with the first group of samples for visual inspection.
A4.4 Take out the conductor from the sample, according to the requirements of GB2951.5-82, punch dumbbell pieces on the illuminated surface and pre-process, measure the tensile strength of the three groups of test pieces before aging and after aging. and elongation at break. When making test pieces, the illuminated surface cannot be ground.kg:
Year and month of manufacture;
8 indicates the correct rotation direction of the reel;
h. standard encdoing.
A1 scope of application
GB12527-90
Appendix A
Artificial climate aging test method (xenon lamp method) (supplement)
This test method is applicable Determination of artificial weathering aging performance of polyvinyl chloride (PVC), polyethylene (PE), and cross-linked polyethylene (XLPE) overhead insulated cables.
A2 test equipment
A2.1 xenon lamp climate aging chamber
The rack rotates once per minute, the box temperature is 55±2°C, and the relative humidity is (85±5)%. A2.1.2 The water spray should be clean tap water, the water spray pressure is 0.12~0.15MPa, the inner diameter of the water spray nozzle is Φ0.8mm, water spraying, lighting, and lighting alone are carried out within 18 minutes, and periodically. A2.2 Ozone generating device
A2.3 Industrial sulfur dioxide
A2.4-40℃ freezer
A2.5 tensile testing machine indication accuracy, from the dials at all levels Above 1/10 range, but not less than 4% of the maximum load, ±1%. A3 Sample Preparation
Cut a sample section from the end of the cable under test 500mm long enough for three sets of tests to determine the effective performance. Sample sections with mechanical damage cannot be used as test specimens.
The first set of specimens should be at least 5 for original performance measurement. The second set of samples should be at least 5 for performance measurement after 0 to 1008 hours of photoaging. There should be at least 5 samples in the third group for performance measurement after 5041008h photoaging. A4 test steps
A4.1 The first group of samples should be stored in a cool and dry place, the second and third groups of samples should be placed in a xenon lamp climate chamber for testing, and the third group of samples should be tested 504 hours after the start of the test Then put it in.
A4.2 test cycle: The entire test lasts for 6 weeks, and each week is a cycle. The test is conducted according to the conditions of A2.1.1 and A2.1.2 for 6 days. The seventh level is adjusted as follows a and b. , test under the conditions specified in c. Adjustment a Aging sample should be placed for one day in an environment with a temperature of 40±3°C, containing 0.067% sulfur dioxide and an ozone concentration greater than 20×10-6.
Adjustment b: The aging sample should be moved from the environment of A2.1.1 and A2.1.2 to a freezing room of -25±2℃, and conduct cold and hot tests. A total of three times, 2h each time, and two thermal shocks The interval should be equal to or greater than 1h. Adjustment c: The aging sample should be placed in a container at 40±3°C and containing 0.067% sulfur dioxide saturated humidity for 8 hours. Then, open the container and place it in the laboratory environment for 16 hours.
A4.3 After the specified aging time, take out the sample and store it at ambient temperature for at least 16 hours. Compare the appearance with the first group of samples for visual inspection.
A4.4 Take out the conductor from the sample, according to the requirements of GB2951.5-82, punch dumbbell pieces on the illuminated surface and pre-process, measure the tensile strength of the three groups of test pieces before aging and after aging. and elongation at break. When making test pieces, the illuminated surface cannot be ground.kg:
Year and month of manufacture;
8 indicates the correct rotation direction of the reel;
h. standard encdoing.
A1 scope of application
GB12527-90
Appendix A
Artificial climate aging test method (xenon lamp method) (supplement)
This test method is applicable Determination of artificial weathering aging performance of polyvinyl chloride (PVC), polyethylene (PE), and cross-linked polyethylene (XLPE) overhead insulated cables.
A2 test equipment
A2.1 xenon lamp climate aging chamber
The rack rotates once per minute, the box temperature is 55±2°C, and the relative humidity is (85±5)%. A2.1.2 The water spray should be clean tap water, the water spray pressure is 0.12~0.15MPa, the inner diameter of the water spray nozzle is Φ0.8mm, water spraying, lighting, and lighting alone are carried out within 18 minutes, and periodically. A2.2 Ozone generating device
A2.3 Industrial sulfur dioxide
A2.4-40℃ freezer
A2.5 tensile testing machine indication accuracy, from the dials at all levels Above 1/10 range, but not less than 4% of the maximum load, ±1%. A3 Sample Preparation
Cut a sample section from the end of the cable under test 500mm long enough for three sets of tests to determine the effective performance. Sample sections with mechanical damage cannot be used as test specimens.
The first set of specimens should be at least 5 for original performance measurement. The second set of samples should be at least 5 for performance measurement after 0 to 1008 hours of photoaging. There should be at least 5 samples in the third group for performance measurement after 5041008h photoaging. A4 test steps
A4.1 The first group of samples should be stored in a cool and dry place, the second and third groups of samples should be placed in a xenon lamp climate chamber for testing, and the third group of samples should be tested 504 hours after the start of the test Then put it in.
A4.2 test cycle: The entire test lasts for 6 weeks, and each week is a cycle. The test is carried out according to the conditions of A2.1.1 and A2.1.2 for 6 days. The seventh level is adjusted according to the following adjustments a and b. , test under the conditions specified in c. Adjustment a Aging sample should be placed for one day in an environment with a temperature of 40±3°C, containing 0.067% sulfur dioxide and an ozone concentration greater than 20×10-6.
Adjustment b: The aging sample should be moved from the environment of A2.1.1 and A2.1.2 to a freezing room of -25±2℃, and conduct hot and cold tests. A total of three times, 2h each time, and two thermal shocks The interval should be equal to or greater than 1h. Adjustment c: The aging sample should be placed in a container at 40±3°C and containing 0.067% sulfur dioxide saturated humidity for 8 hours. Then, open the container and place it in the laboratory environment for 16 hours.
A4.3 After the specified aging time, take out the sample and store it at ambient temperature for at least 16 hours. Compare the appearance with the first group of samples for visual inspection.
A4.4 Take out the conductor from the sample, according to the requirements of GB2951.5-82, punch dumbbell pieces on the illuminated surface and pre-process, measure the tensile strength of the three groups of test pieces before aging and after aging. and elongation at break. When making test pieces, the illuminated surface cannot be ground.
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