This standard specifies product classification, general technical requirements, test methods and inspection rules for mining rubber-sheathed flexible cables. This standard applies to copper-core rubber-insulated rubber-sheathed mining flexible cables with AC rated voltage U0/U of 3.6/6kV and below. GB 12972.1-1991 Rubber sheathed flexible cables for mining use Part 1: General provisions GB12972.1-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Flexible rubber-sheathed cables for mining purposes
Part 1: General provisions
Flexible rubber-sheathed cables for mining purposesPart 1: General
1 Topic Content and scope of application
GB12972.1-91
Replaces GB1170-74
This standard specifies product classification, general technical requirements, test methods and inspection rules for mining rubber-sheathed flexible cables . This standard applies to copper-core rubber-insulated rubber-sheathed mining flexible cables with AC rated voltage U./U of 3.6/6kV and below. This standard should be used together with subsequent parts such as GB12972.2~12972.10 respectively. 2 Reference standards
GB2900.10 Electrical terminology Wires and cables GB3956 Electrical equipment wires and cables Copper and aluminum conductive cores GB2951
Test methods for physical and mechanical properties of wires and cables Test methods for electrical properties of wires and cables||tt| |GB3048
GB4909
Bare wire test method
GB6995
Wire and cable identification mark method
GB4005
Wire and cable delivery tray| | tt | |GB12666
GB12972.2
GB12972.3
GB12972.4
Part 2: Mining soft cables for coal shearers with rated voltage 0.66/1.14kV and below Rubber sheathed flexible cable
Mining rubber sheathed flexible cable
Mining rubber sheathed flexible cable
GB12972.5
Mining rubber sheathed flexible cable
B12972.6
GB12972.7
GB12972.8
GB12972.9
Rubber sheathed flexible cable for mining
Rubber sheathed flexible cable for mining| |tt||Rubber sheathed flexible cable for mining
Rubber sheathed flexible cable for mining
Part 3: Rated voltage 0.66/1.14kV shearer shielding monitoring reinforced flexible cable Part 4: Rated Metal shielded flexible cables for shearers with voltage 0.66/1.14kV Part 5: Mobile rubber sheathed flexible cables with rated voltage 0.66/1.14kV and below Part 6: Shielded monitoring flexible cables with rated voltage 3.6/6kV Part 7: Rated voltage 3.6 /6kV shielded rubber sheathed flexible cable Part 8: Rated voltage 0.3/0.5kV mining electric drill cable Part 9: Mining mobile light rubber sheathed flexible cable Part 10: Miner's hat lamp wire
Mining rubber sheath Flexible cable
GB12972.10
3 Terms, symbols, codes
3.1 Terminology
3.1.1 The terms and terms in this standard adopt the interpretation of GB2900.10. 3.1.2 Rated voltage
State Bureau of Technical Supervision approved on 1991-06-06 for implementation on 1992-03-01
GB12972.1-91
Rated voltage is the cable design and electrical performance test The reference voltage used is expressed in U/U and the unit is kV. U. ——Represents the effective value of the voltage between any main insulated conductor and "ground" (metal shield, metal sheath or surrounding medium). U - The effective value of the voltage between any two phase conductors of a multi-core cable (wire) or single-core cable (wire) system. When a cable (wire) is used in an AC system, the rated voltage of the cable (wire) 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 (wire). times. The operating voltage of the system should not be greater than 1.1 times the rated voltage of the system. 3.2 Symbol, code
3.2.1 Series code
3.2.2 Usage characteristics code
Mobile (for coal mining equipment)
Coal shearer (for)|| tt||Cap lamp (for use)
Electric drill (for use)
Low temperature environment (for use)
3.2.3 Structural feature code
Non-metal shielding||tt| |Metal shielding
Monitoring
Lightweight
Braiding reinforcement
Wrap reinforcement
3.3 Product representation
U
Y
c
M
z
D
P
PT
J
Q| |tt||B
R
3.3.1 Products are represented by model, specification and standard number. -
3.3.2 Example
a.
area+area
number of auxiliary wire cores and nominal cross-section (mm2)
-ground wire core Number and nominal cross-section (mm2)
Number of power wire cores and nominal cross-section (mm2)
U/U(k)
Use characteristic code and structural feature code||tt ||Series code
Coal shearer shielded rubber sheathed flexible cable, rated voltage 0.66/1.14kV, power core 3×50, ground core 1×25, control core 3×6, with semi-conductive shielding Layer, expressed as: UCP-0.66/1.14
3×50+1×25+3×6
GB12972.2
b. Shearer shielding monitoring braided reinforced rubber Set of flexible cables, rated voltage 0.66/1.14kV, power core 3×50, ground core 1×25, control core 2×2.5, with semi-conductive shielding layer, monitoring core and braided reinforcement layer, expressed as: UCPJB -0.66/1.14
3×50+1×25+2×2.5
GB12972.3
c. Coal shearer metal shielded rubber sheathed flexible cable, rated voltage 0.66/1.14 kV, power wire core 3×70, ground wire core 1×35, monitoring wire core 1×35, with metal shielding layer, expressed as: UCPT-0.66/1.14
3×70+1×35+1 ×35
GB12972.4
d.
Mobile rubber-sheathed flexible cable for mining, rated voltage 0.38/0.66kV, power core 3×35, ground core 1×16 , without shielding layer, expressed as:
UY-0.38/0.66
GB12972.1—91
3×35+1×16
GB12972.5| |tt||Mining mobile shielded monitoring rubber-sheathed flexible cable, rated voltage 3.6/6kV, power core 3×35, ground core 3×16/3, monitoring core 3×2.5, with semi-conductive shielding layer, Expressed as: UYPJ-3.6/6
3×35+3×16/3+3×2.5
GB12972.6
f. Mining mobile shielded rubber sheathed flexible cable, Rated voltage 3.6/6kV, power wire core 3×25, ground wire core 1×16, for low temperature environment, with semi-conductive shielding layer, expressed as:
UYPD-3.6/6
g.
h.
4 conductors
3×25+1×16
GB12972.7
Mining electric drill cable, rated voltage 0.3/0.5kV , power wire core 3×4, ground wire core 1×4, without shielding layer, expressed as: UZ-0.3/0.5
3×4+1×4
, GB12972.8| |tt||Mining mobile light rubber sheathed cable, rated voltage 0.3/0.5kV, insulated core 3×0.75, without shielding layer, expressed as: .UYQ-0.3/0.5
3×0.75|| tt | |tt||4.1 The nominal cross-section and structure of the conductor comply with the third provision of GB3956. When using a similar structure, the nominal diameter of a single wire should not be greater than the value specified in Table 1, and the corresponding number of single wires should be calculated and determined based on the nominal cross-sectional area. According to the characteristics of use, each subsequent standard may also separately specify the conductor structure. Table 1
nominal cross-section
mm?
1.0
1.5
2.5
4
6
10
16
25
35
50
70| |tt||95
Conductor structure
Number of wires/nominal diameter of single wire, mm
32/0.20
30/0.25
49/0.25
56/0.30
84/0.30
84/0.40
126/0.40
196/0.40
276/0.40|| tt||396/0.40
360/0.50
475/0.50
Plating
Conductor resistance at 20℃, 2/km maximum
Tin
20.0
13.7
8.21
5.09
3.39
1.95
1.24
0.795|| tt||0.565
0.393
0.277
0.210
Not tinned
19.5
13.3
7.98|| tt||4.95
3.30
1.91
1.21
0.780
0.554
0.386
0.272||tt| |0.206
4.2 It is recommended that the twisting direction of the strands in the conductor is the same as that in the compound twisting. The outermost layer is twisted to the left, and can also be twisted according to GB3956. The twisting pitch and direction of the ground core located in the center of the cable are specified by the manufacturer. 4.3 The isolation layer of the conductor should be specified in each subsequent standard. 5 Insulation
GB 12972.1-91
5.1 The power core and control core conductors must be extruded with an insulation layer. 5.2 The nominal value of insulation thickness should be specified in each continued standard. The average insulation thickness should not be less than the nominal value, and the thickness at the thinnest point should not be less than 90% of the nominal value minus 0.1mm.
5.3 The electrical performance of the insulation should meet the following requirements. Before being cabled, the unshielded insulated power line core should be subjected to immersion power frequency AC voltage test according to Table 2. However, various types of rated voltages of 0.38/0.66kV and below The insulated cores (including control cores) of model cables are allowed to undergo power frequency spark voltage tests according to Table 3. Table 2
rated voltage
kv
3.6/6
0.66/1.14
0.38/0.66
0.3/0.5||tt ||Insulation thickness
Nominal value:
mm
0.5<1.0
1.0<1.5
Test voltage
(effective value )
kv
6
10
Test voltage, kv
(effective value)
11.0
3.7| |tt||3.0
2.0
Table 3
Insulation thickness
nominal value.
mm
1.5<%2.0
2.0<8
5.4 There should be no bonding between insulation and conductor, between insulation and between insulation and sheath. 6 shielding
voltage application time
min
5
5
5
5
test voltage||tt ||(effective value)
kv
15
20
6.1 The conductor of the cable with a rated voltage of 3.6/6kV must have a conductor shield, and the shielding layer does not adhere to the conductor . One of the types in Table 4 can be used upon request.
Table 4
Structure code
A
B
c
Note: 1) The calculated thickness is not assessed.
Structural type
Semi-conductive extruded cladding
Semi-conductive tape cladding
B type and A type combination
Calculation
Thickness
Degree 1, mm
0.7
0.7
0.7
6.2 Shielded cable power core must have insulation shielding, Table 5 can be used according to requirements A type in which the extruded cladding of a semiconductive compound can be peeled off the insulation without the insulation being damaged. Insulation shielding with a single structure of semi-conductive tape is not recommended. If both parties agree, the manufacturer can also supply cables with this structure. Structure code
A
B
c
D
Note: 1) The calculated thickness is not assessed.
GB12972.1—91
Table 5
Structural type
Semiconductive extruded cladding
Semiconductive tape cladding + metal/fiber braid Type A and B combination
Tape ten metal/fiber braid
Calculated thickness\,mm
0.7
1.4
1.7||tt ||1.4
6.3 The thermal aging properties of the extruded semiconductive layers in conductor shields and insulating shields shall be comparable to those of the combined rubber insulation. 6.4 Metal and fiber braided structures shall comply with the following requirements: a. It consists of tinned copper wire and polyamide or polyester synthetic fiber yarn. The two have the same number of spindles and opposite directions. It is recommended to use the copper stranded wire structure specified in Table 6.
Table 6
Number of roots/single wire nominal diameter
13/0.30
10(9)/0.30
7/0.30||tt| |10/0.20
Calculate thickness
1.0
1. 0
1. 0
0.6
Calculate
Width
1.8
1.4
0.9
0.9
The braided layer is not allowed to be connected as a whole. The exposed copper wire ends should be cut neatly. It is allowed for every 1m length. Replace a wire spindle. b.
mm
The number of spindles and the number of copper strands per spindle are calculated and determined according to the coverage rate F using formula (1). The braiding pitch diameter ratio (pitch length/braiding layer average straight C.| |tt|| diameter) is 2~4.5.
mnd
D
Where: F-
D-
Coverage, %;
The average diameter of the braided layer, mm;
Calculated width of stranded wire, mm;
d
L-
m-
n-
7 cable cores| |tt||Braiding pitch, mm;
The number of copper stranded wire spindles;
The number of stranded wires per spindle.
7.1 The power wire core must be twisted, and the twisting direction is right. 7.2 The control wire core can be placed in the following position: a. In the gap of the power wire core;
D2
12
×100
.(1)|| tt||b. Stranded into one unit as the 4th core and twisted with the power core, the stranded pitch diameter ratio is not greater than 8, the stranding direction is left, and can be wrapped with tape or rubber coating;
c.|| tt|| is twisted with the power wire core as the fourth core.
7.3 The monitoring wire core can be placed in the following position: a.
In the gap of the power wire core; bzxZ.net
is twisted with the power wire core as the fourth core; ||tt| |b.
Controls the outside of the wire core insulation;
c.
d.
is set concentrically with the cable core.
7.4 ground core can be placed in the following position:
a.
in the gap of the power core;
is twisted with the power core as the 4th core ;
b.
c.
d.
The outside of the power wire core insulation;
Set concentrically with the cable core;||tt| |e.
The center of the cable core.
GB12972.1-91
The ground core conductor of unshielded cables can be extruded with an insulating layer or a semi-conductive layer. The ground core conductor of a shielded cable can be extruded or not extruded with a semi-conductive layer.
7.5 When there is no core in the center of the cable core, it should be filled. The outer gap of the cable core can be filled and wrapped. The filler of the shielded cable should be semi-conductive material. The filling material of unshielded cables should be non-hygroscopic material. 7.The stranded pitch diameter ratio of 6 cable cores is specified in each subsequent standard. Note: The stranding pitch ratio is defined as the ratio of the stranding pitch length to the outer diameter of the cable core. 8 Sheath
8.1 The outside of the cable core must be extruded with a sheath layer.
8.2 The nominal value of sheath thickness is specified in each subsequent standard. The average thickness of the sheath should not be less than the nominal value, and the thickness of the thinnest point should not be less than 85% of the nominal value minus 0.1mm.
8.3 The sheath can be a single-layer structure or a double-layer structure. In the double-layer structure, different types of rubber mixtures can be used for the inner sheath and outer sheath, and the thickness of the outer layer should not be less than 50% of the total thickness. 8.4 The surface of the outer sheath should be smooth, basically uniform in color, and there should be no visible pores in the cross section. 9 Reinforcement layer
9.1 The cable can be equipped with a reinforcement layer and placed between the inner and outer sheaths. 9.2 Reinforcement layer structure type:
fiber braid;
a.
b. steel wire strand braid;
c steel wire strand wrapping.
Note: If the metal reinforcement layer also serves as the ground core, it can contain copper wires. 10 Identification mark
The insulated wire core and cable identification marks shall comply with the corresponding provisions of GB6995. 10.1 Insulated wire core identification mark
10.1.1 Color and color sequence
a.
The preferred colors for 2-core cable insulated wire cores are red and white; for 3-core cable insulated wires The preferred colors for the core are red, white and light blue; b.
c.
The ground core should be black:
The preferred colors for the control wire core are not recommended and color sequence. d.
Identification method
10.1.2
a.
b.
Use insulating rubber of different colors;
Color strips of different colors are printed on the surface; c. Colored yarn is embedded in the fiber yarn of the braided layer; GB12972.1-91
d. Arabic numerals are printed on the surface of the insulation or shielding layer. 10.2 Cable identification mark
10.2.1 Rated voltage (only applicable to underground cables) 3.6/6kv..
0.66/1.14kV
0.38/0.66kV and below.|| tt||Red sheath
Yellow sheath
Black sheath
10.2.2 The name of the manufacturer, cable model, specification (or year of manufacture) shall be embossed or clearly colored Ink that is different from the color of the sheath is printed on the surface of the outer sheath.
10.2.3 Other marks specified by the manufacturer are allowed inside or outside the cable. 11 Finished cables
Unless otherwise specified in subsequent standards, various types of cables should comply with the following requirements. 11.1 Outer diameter of finished cable
The outer diameter of finished cable is specified in each subsequent standard. 11.2 Conductor resistance
The DC resistance of the conductor at 20℃ shall comply with the provisions of Table 1 of this standard. 11.3 Insulation resistance
The measured insulation resistance value is converted to the insulation resistance constant K at 20°C; it should comply with the requirements in Table 7. Table 7
Insulated core type and rated voltage
k
Power
Wire core
3.6/6
0.66/1.14| |tt||0.38/0.66 and below
Control core
Monitor core (with insulation coating)
Insulation resistance constant conversion formula:
Known When the cable insulation resistance is,
where: Ki-
-insulation resistance constant, MQ·km;
K; = R/lg(D/d)
R——The measured insulation resistance of the cable, MQ·km; D——The outer diameter of the insulation of the insulated wire core, mm; The inner diameter of the insulation of the insulated wire core, mm.
d
When the volume resistivity v of the insulating mixture is known, K =0.367×10-11×v
11.4 Transition resistance
K
MQ·km minimum value
2400
734
734
734
180
·(2)
. (3)
GB 12972.1-91
Unless otherwise specified in subsequent standards, the transition resistance of the shielding layer or monitoring layer should not be greater than 3k2. 11.5 Power frequency AC voltage test
Power line The test voltage of the core should comply with the requirements in Table 8. Table 8
Insulated wire core type and rated voltage
kv
Power
Wire core
3.6/6
0.66/1.14| |tt||0.38/0.66
0.3/0.5
Control wire core
11.6 Combustion test
Test voltage, kv
(effective value)| |tt||11.0
3.7
3.0
2.0
1.5
The cable shall withstand the combustion test specified in GB12666.2DZ-1. 11.7 Shearer cables and mobile cables with rated voltages of 0.38/0.66 and 0.66/1.14kV should have: a.
b.
mechanical impact resistance, the indicators are specified in subsequent standards. Anti-extrusion performance, the indicators will be specified in subsequent standards. Voltage application time
min
5
5
5
5
5
11.8 The rated voltage is 0.38/ 0.66 and 0.66/1.14kV shearer cables should have bending resistance, and the index requirements will be specified in subsequent standards.
11.9
Cables with rated voltage 3.6/6kV shall withstand: a.
b.
e
d.
Test and indicators are specified in subsequent standards. Dielectric loss tangent test, the indicators will be specified in subsequent standards. For impulse voltage test, the indicators will be specified in subsequent standards. 3U4h withstand voltage test.
11.10. Insulation physical and mechanical properties
The physical and mechanical properties of cable insulation should comply with the provisions of subsequent standards. 11.11 Physical and mechanical properties of the sheath
The physical and mechanical properties of the cable sheath should comply with the provisions of each subsequent standard. According to the requirements of the use environment, each subsequent standard may also stipulate other performance requirements. 11.12 Delivery length
a.
b.
c.
cable according to both parties Delivery of agreed length. If there is no agreement, the delivery shall be in accordance with the length specified in Table 9, and the length of the short section shall not exceed 10% of the total length of delivery. The length measurement error shall not exceed ±0.5%.
Table 9
Cable category
3.6/6kV cable
Shearer cable
Mobile equipment cable
Lightweight rubber sheathed cable| |tt||Electric drill cable
Cap light wire
Note: 1) is the average delivery length.
Standard
1504
200
100
100
100
100
Long|| tt||minimum value
degree
short segment
40
50
40
40
40|| tt | 13 Inspection Rules
13.1 Products can only leave the factory after passing the inspection by the technical inspection department of the manufacturer. Factory products should be accompanied by a quality inspection certificate. 13.2 Products are tested and accepted according to regulations. The definitions of routine tests (R), sampling tests (S) and type tests (T) are as specified in GB2951.1. 13.3 The number of specimens for sampling testing shall be determined through negotiation between the supplier and the buyer. If there is no agreement, it shall be 10% of the number of delivered trays: but not less than 3 trays. 13.4 In case of dispute, the user has the right to request specified items for batch delivery products. test. The test can be conducted at the manufacturer, or an arbitration test can be conducted by an authoritative agency.
13.5 When the random inspection results are unqualified, the sampling should be doubled and the unqualified items should be tested for the second time. If the unqualified items are still unqualified, the test should be 100% carried out.
13.6 The test method shall comply with the wire and cable test method standards and the provisions of the appendix of this standard. 14 Packaging
14.1 Cable delivery tray should comply with GB4005 regulations. 14.2. The cable should be neatly wound on the cable delivery tray. The cable ends should be tightly sealed, and the length exposed outside the cable drum should meet the requirements of the AC voltage test.
14.3 Only cables of the same model and specifications are allowed to be wound on each cable drum. 14.4 Cap lamp wires are supplied in coils or bundles and should be properly packaged, and the weight of each coil should not exceed 80kg. There are 50 short wire segments in a bundle, and 4 bundles are packed into bundles.
14.5 The packaging should be marked:
a.
Manufacturer name:
b. Product model and specifications;
c
Rated voltage, kV;
d． Length, m
e. Gross weight, kg;
f. Year and month of manufacture;
standard number;
g
h.
Correct rotation direction of the cable drum.
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