This standard specifies product varieties, technical requirements, test methods and inspection rules for shielded monitoring flexible cables with rated voltage 3.6/6kV. This standard applies to copper core shielded monitoring type rubber insulated rubber sheathed flexible cables for underground mobile transformers and similar equipment. This standard should be used together with GB 12972.1. GB 12972.6-1991 Rubber-sheathed flexible cables for mining use Part 6: Mobile rubber-sheathed flexible cables with rated voltage 0.66/1.14 kV and below GB12972.6-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber-sheathed Flexible Cables for Mining
Part 6: Rated Voltage 3.6/6kV
Shielded Monitoring Flexible Cables
Flexible rubber-sheathed cablesformining purposesPart 6: Flexible cables with monitoring core and semiconducting screens for rated voltage of 3. 6/6 kV subject content and scope of application
GB12972.6--91
replaces GB1170—74
This standard specifies product varieties, technical requirements, test methods and inspection rules for shielded monitoring flexible cables with rated voltage 3.6/6kV. This standard applies to copper core shielded monitoring type rubber insulated rubber sheathed flexible cables for underground mobile transformers and similar equipment. This standard should be used together with GB12972.1. 2Usage characteristics
2.1 Rated voltage U./U is 3.6/6kV.
2.2 The long-term allowable operating temperature of the cable conductor is 90°C. 2.3 The minimum bending radius of the cable is 6 times the cable diameter. 2.4 Cables must not be exposed to sunlight for long periods of time. 2.5 The ground core of the cable must be well grounded. 3 model
3.1
cable models are shown in Table 1.
Table 1
Type
No.
UYPJ-3.6/6
Name
Name
Mine Mobile Shield Monitoring type rubber sheathed soft
cable
3.2 cable type is shown in Figure 1.
State Bureau of Technical Supervision approved on 1991-06-06
TU
Power connection for underground mobile transformers and similar equipment with a rated voltage of 3.6/6kV
1992- 03-01Implementation
4 specifications
GB12972.6—91
Figure 1
3
5
1 one power wire core Conductor and conductor shielding: 2-rubber insulation: 3-insulated shield (also used as ground wire): 4-inner sheath; 5-monitoring core and semiconductor tape cladding; 6-outer sheath cable specifications should comply with Table 2 .
Table 2
Number of cores × nominal conductor cross-section, mm2
Power wire core
3×25
3×35
3×50
Ground core
3×16/3
3×16/3
3×25/3
Note: 1) Calculation of thickness will not be assessed.
5 technical requirements
Control wire core
3×2.5
3×2.5
3×2.5
Power wire core|| tt||insulated
edge
nominal thickness
4.0
4.0
4.0
5.1 The technical requirements of the cable should comply with Table 3 and specified in Table 4. 5.2 Conductors
5.2.1 Single wires in conductors should be tinned.
5.3 insulation
Inner sheath
Calculated thickness 1)
2.5
2.5
2.5
Outer sheath
Nominal thickness
5.5
5.5
5.5
Cable outer diameter
UYJP-3.6/6
Min. value
64.8
68.3
71.7
mm
maximum value
70.8
74.3
77.7
5.3.1 The insulation should be made of ethylene-propylene rubber-based insulating rubber. Its performance should comply with the XJ-30A regulations in GB7594.8, but the tensile strength should not be less than 6.5MPa.
5.3.2 The conductor shield adopts the Class A or Class C structure in Table 4 of GB12972.1, and the insulation shield adopts the Class B or C structure of Table 5 of GB12972.1.
5.4 cable core
5.4.1 The position of the monitoring wire core complies with the provisions of Article 7.3d of GB12972.1. 5.4.2 The position of the ground core complies with the provisions of Article 7.4c of GB12972.1. The twisted pitch ratio of the wire core should not be greater than 12. 5.43
5.5
GB12972.6-91
5.5.1 The inner sheath should comply with XJ-10A in GB7594.3 Type regulations. 5.5.2 The outer sheath shall be made of chloroprene rubber or chlorosulfonated polyethylene-based sheath rubber, and its performance shall comply with the provisions of Appendix A of this standard. Table 3
Nominal cross-section of power wire core
mm2
25
35
50
Test and inspection rules||tt| |6
Products are tested as specified in Table 4.
Serial number
1
1.1
1.2
1.3
1.4
1.5
1.6|| tt||2
2.1
2.2
2.3
2.4
2.5
2.6
2.7||tt| |2.8
Project name
Structural dimensions
Conductor
Insulation thickness
Shielding layer
Cable core
Sheath Thickness
Cable outer diameter
Cable performance
Bulk resistance
Insulation resistance
Transition resistance
Power frequency AC voltage||tt ||Test
Burning test
Partial discharge test
Dielectric loss angle positive
Shear test
Impact voltage test
At 20℃ Insulation resistance, MQkm minimum value
Power wire core
650
550
500
Table 4
Technical requirements||tt| |GB12972.1 Article 4.1 and this standard Article 5.2 GB12972.1 Article 5.2 and this standard Table 2
This standard Article 5.3.2
GB12972.1 Article 7 and this standard Article 5.4 GB12972.1 Article 8 and Table 2 of this standard
Table 2 of this standard
Table 1 of GB12972.1
Table 3 of this standard
GB12972.1 Article 11.4
GB12972.1 Table 8
GB12972.1 Article 11.6
1.5U discharge amount is not greater than 20pC
U. When the discharge amount is not greater than 0.035||tt ||95℃, 60kV positive and negative polarity after 10 times each, power frequency 11kV15min
Test type
T,s
T,s
T,s| |tt||T,s
T,s
T,s
T,R
T,R
T,s||tt ||T,R
T,St
T,s
T,St
T,St
Monitor wire core
5
5
5
Test method
GB4909.2
GB2951.2
Visual inspection
Visual inspection
GB2951.3
GB2951.4
GB3048.4
GB2951.5
GB12972.1 Appendix D
GB3048 .8
GB12666.2
GB3048.12
GB3084.11
GB3048
Serial number
2.9
2.10
2.11
2.12
2.13
3
Project name
4h voltage test
Insulation water absorption
Dielectric constant
Insulation physical machinery||tt| |Performance
Sheath physical machinery
Performance
Identification mark
Delivery length
GB 12972. 6-91
Cont. 4
Technical requirements
Power frequency AC test voltage 3U
1~14d capacitance increase ≤6%
7~14d capacitance increase ≤2.5%
≤4.5
Article 5.3 of this standard
Article 5.5 of this standard
Article 10 of GB12972.1
Article 11.12 of GB12972.1
Note : ①$ means periodic testing, which should be conducted at least once a year. Test type
T,st
T,st
T,st
T
T,st
T,st|| tt||T,st
R
Test method
GB3048.8
GB12972.1
Appendix E
GB2951|| tt | The test is carried out on the same sample in the order of 2.6, 2.7, 2.8, and items 2.9, 2.7 and 2.9 can also be sampled separately. No.
Sequence
1
1.1
1.2
1.3
2
2.1
2.2| |tt||2.3
2.4
3
3.1
3.2
4
4.1
4.2||tt ||5.1
5.2
Sample before aging
Tensile strength
Elongation at break
Tear strength
Air box Thermal aging test
Test temperature
Test time
Tensile strength change rate
Elongation at break
Change rate of elongation at break||tt ||GB12972.6—91
Appendix A
Rubber insulation performance requirements
(Supplement)
Table A1
Test items||tt| |minimum value
minimum value
, minimum value
maximum value
minimum value
maximum value
fracture after 14~28d aging The ratio of the difference between the middle value of elongation and the elongation at break before aging
Air elastic aging test
Test temperature
Test pressure
Test time||tt| |Change rate of tensile strength
Change rate of elongation at break
Oil immersion test
Test temperature
Test time
Change rate of tensile strength| |tt||Change rate of elongation at break
Hot elongation test
Test temperature
Mechanical stress
Loading time
Load elongation|| tt||Permanent deformation after cooling
Note: 1) This test will only be carried out when requested by the user. maximum
max
max
max
max
max
max
MPa
%
N/mm
℃
h
%
%
%
%
℃
kPa
h
%
%
c
h
%|| tt||%
℃
kPa
min
%
%
11.0
250||tt| |7.5
refers
standard
120±2110±11)
7×2428×241)
±501)
± 30
1201)
±40
±201)
127±1
550±20
42
±50
±50
100±2
24
±40
±40
200±3
200
15
175
25
GB 12972.6-91
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry, Fushun Branch of the General Institute of Coal Science and Technology. The main drafters of this standard are Liu Fenglin and Hu Jianguo.6—91
Appendix A
Rubber insulation performance requirements
(supplement)
Table A1
Test items
Minimum value| |tt||minimum value
, minimum value
maximum value
minimum value
maximum value
middle of the elongation at break after 14~28d aging The ratio of the difference in value to the elongation at break before aging
Air elastic aging test
Test temperature
Test pressure
Test time
Tensile strength Change rate
Change rate of elongation at break
Oil immersion test
Test temperature
Test time
Change rate of tensile strength
Change rate of elongation at break
Hot elongation test
Test temperature
Mechanical stress
Loading time
Load elongation
Cooling Post-permanent deformation
Note: 1) This test will only be carried out when requested by the user. maximum
max
max
max
max
max
max
MPa
%
N/mm
℃
h
%
%
%
%
℃
kPa
h
%
%
c
h
%|| tt||%
℃
kPa
min
%
%
11.0
250||tt| |7.5
refers
standard
120±2110±11)
7×2428×241)
±501)
± 30
1201)
±40
±201)
127±1
550±20
42
±50
±50
100±2
24
±40
±40
200±3
200
15
175
25
GB 12972.6-91
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry, Fushun Branch of the General Institute of Coal Science and Technology. The main drafters of this standard are Liu Fenglin and Hu Jianguo.6—91
Appendix A
Rubber insulation performance requirements
(Supplement)
Table A1
Test items
Minimum value| |tt||minimum value
, minimum value
maximum value
minimum value
maximum value
middle of the elongation at break after 14~28d aging The ratio of the difference in value to the elongation at break before aging
Air elastic aging test
Test temperature
Test pressure
Test time
Tensile strength Change rate
Change rate of elongation at break
Oil immersion test
Test temperature
Test time
Change rate of tensile strength
Change rate of elongation at break
Hot elongation test
Test temperature
Mechanical stress
Loading time
Load elongation
Cooling Post-permanent deformation
Note: 1) This test will only be carried out when requested by the user. maximum
maxbzxZ.net
max
max
max
max
max
MPa
%
N/mm
℃
h
%
%
%
%
℃
kPa
h
%
%
c
h
%|| tt||%
℃
kPa
min
%
%
11.0
250||tt| |7.5
refers
standard
120±2110±11)
7×2428×241)
±501)
± 30
1201)
±40
±201)
127±1
550±20
42
±50
±50
100±2
24
±40
±40
200±3
200
15
175
25
GB 12972.6-91
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry, Fushun Branch of the General Institute of Coal Science and Technology. The main drafters of this standard are Liu Fenglin and Hu Jianguo.
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