This standard specifies the product varieties, technical requirements, test methods and inspection rules of metal shielded flexible cables for coal shearers with rated voltage 0.66/1.14 kV. This standard applies to copper core rubber insulated rubber sheathed metal shielded flexible cables with rated voltage 0.66/1.14kV for coal shearers and similar equipment. This standard should be used together with GB 12972.1. GB 12972.4-1991 Mining rubber sheathed flexible cables Part 4: Metal shielded flexible cables for rated voltage 0.66/1.14 kv coal shearers GB12972.4-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber-sheathed flexible cables for mining
Part 4: Metal-shielded flexible cables with rated voltage 0.66/1.14kV for coal shearers
Flexible rubber-sheathed cables for mining purposesPart 4: Flexible coalcutter cables with indivdualmetallic screens for rated voltage of 0. 66/1. 14 kV Subject content and scope of application
GB12972.4—91
replaces GB1170—74
This standard specifies the product varieties, technical requirements, test methods and inspection rules of metal shielded flexible cables for coal shearers with rated voltage 0.66/1.14kV.
This standard applies to copper core rubber insulated rubber sheathed metal shielded flexible cables for rated voltage 0.66/1.14kV coal shearers and similar equipment.
This standard should be used together with GB12972.1. 2Usage characteristics
2.1 The rated voltage Uo/U is 0.66/1.14kV. 2.2 The long-term allowable operating temperature of cable conductors is 90°C. 2.3 The minimum bending radius of the cable is 6 times the cable diameter. 3 model
3.1
cable models are shown in Table 1.
Table 1
Type
No.
UCPT-0.66/1.14
Name
Name
Shearer metal Shielded rubber sheathed flexible cable
2 cable type is shown in Figure 1. | |tt |
1992-03-01 Implementation
4 specifications
GB12972.4—91
Figure 1
2Www.bzxZ.net
3||tt ||4
5
6
7
1-power core conductor; 2-ground core conductor, 3-insulation: 4-metal/fiber shield :5--Monitor the wire core conductor; 6-Monitor the wire core insulation; 7-Sheathed cable specifications should comply with Table 2.
Table 2
Number of cores 3×35
3×50
3×70
3×95
ground core
1×16
1× 16
1×16
1×25
1×35
1×50
Monitoring wire core
1×16| |tt||1×16
1×16
1×25
1×35
1×50
power core||tt ||Insulated
Edge
Nominal thickness
1.5
1.6
1.6
1.7
1.8||tt ||2.0
Note: The outer diameter of the monitoring wire core should be the same as that of the power wire core. 5 Technical Requirements
5.1 Cable technical requirements should comply with Table 3 and Table 4. 5.2 Conductor
Sheath mark
Weighing thickness
5.0
5.0
5.0
5.3
5.8||tt ||6.4
5.2.1 The single wire of the conductor should be tinned, and the surface of the conductor can be covered with an isolation layer. Note: Discoloration or brittleness of the isolation layer after vulcanization will not be assessed. 5.3 Insulation
Min
35.8
39.7
43.1
48.5
55.1
62.4
Cable outer diameter
UCPT-0.66/1.14
Maximum value
38.6
42.9
46.3
51.8
58.8 | |tt | The strength is not less than 6.5MPa.
5.3.2 After the insulated wire core is immersed in water for 12 hours, a power frequency AC voltage test of 3kV5min should be carried out. 5.3.3 The power wire core insulation is brown, and the monitoring wire core insulation is blue. 5.3.4
The insulation shield should adopt the Class D structure in Table 5 of GB12972.1. 5.4 Cable core
GB12972.4-91
5.4.1 The position of the monitoring wire core complies with the provisions of Article 7.3b of GB12972.1. 5.4.2 The position of the ground core complies with the provisions of Article 7.4e of GB12972.1. 5.4.3 The stranding pitch ratio of the cable core shall not be greater than: power wire core cross-section 25mm2 and below
power wire core cross-section 35mm2 and above
5.5 sheath
C| |tt||.11
5.5.1 If there is an inner sheath, the inner sheath should comply with the XH-02A regulations in GB7594.6. 5.5.2 The outer sheath should comply with the requirements of XH-03A type in QB7594.7, but the tear resistance should not be less than 7.5N/mm. Table 3
power core
nominal cross section of conductor
mm2
16
25
35
50| |tt||70
95
Test and inspection rules
6
Products are tested according to Table 4.
Serial number
1
1.1
1.2
1.3
1.4
1.5
1.6|| tt||2
2.1
2.2
2.2.1
2.2.2
Project name
Structural size||tt| |Conductor
Insulation thickness
Shielding layer
Cable core
Sheath thickness
Cable outer diameter
Cable performance||tt| |Conductor resistance
Power frequency AC voltage
Test
Type test
Routine test
Ground wire and shielding layer at 20℃||tt| |Parallel DC resistance
0/km maximum value
0.70
0.60
0.60
0.50
0.34
0.28
Table 4
Technical requirements
GB12972.1 Article 4:1 and this standard Article 5.2 GB12972.1 Article 5.2 and this standard Table 2
this Standard Article 5.3.4
GB12972.1 Article 7 and this standard Article 5.4 GB12972.1 Article 8 and this standard Table 2
This standard Table 2
GB12972. 1 Table 1 and Table 3 of this standard
GB12972.1 Table 8
3kV5min insulation without breakdown
Insulation resistance at 20℃
M2·km minimum value|| tt||350
366
266
230
210
200
Test type
T,s| |tt||T,s
T,s
T,s
T,s
T,s
T,R||tt ||T
R
Test method
GB4909.2
GB2951.2
Visual inspection
Hanging visual inspection|| tt||GB2951.3
GB2951.4
GB3048.4
GB3048.8
Serial number
2.3
2.4|| tt||2.5
2.6
2.7
3
4
Project name
Insulation water absorption
Insulation resistance
Burning test
Insulation physical machinery
Performance
Sheath physical machinery
Performance
Identification mark
Delivery length
GB12972.4-91||tt| |Continued Table 4
Technical requirements
1~14d capacitance increase rate ≤10%
7~14d capacitance increase rate ≤3%
Table 3 of this standard|| tt||GB12972.1 Article 11.6
Article 5.3.1 of this standard
Article 5.5 of this standard
Article 10 of GB12972.1
GB12972.1 Article 11.12
Note: St means periodic testing, which should be conducted at least once a year. Additional notes:
This standard is proposed by the Ministry of Mechanical 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. Test type
T,St
T,R
T,St
T,st
T,St
T,St
R
Test method
GB12972.1
Appendix E
GB3048.5
GB12666.2
GB2951 | |tt | The main drafters of this standard are Liu Fenglin and Tang Kaizong
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