Some standard content:
National Standard of the People's Republic of China
Insulating rope for live working
Insulating rope for live working1 Subject content and scope of application
GB13035--91
This standard specifies the materials, technical requirements, test methods and inspection rules for insulating ropes for live working. This standard applies to machine-made multi-strand insulating ropes made of mulberry silk and nylon filaments used for live working on electrical equipment of 500kV and below in dry and good climates. 2 Special terms
2.1 Picking direction
The fibers in a single yarn or the single yarn in a strand are twisted from bottom to top and from right to left, which is called S twist (forward twist), and from bottom to top and from left to right, which is called Z twist (backhand twist) (see Figure 1).
S
(a) S pick (forward)
Figure 1 Schematic diagram of twist
(b) Z twist (backward)
The method of indicating the twist direction of a strand is that the first letter indicates the twist direction of a single yarn, and the second letter indicates the twist direction of the strand. For a strand that has been twisted twice, the first letter indicates the twist direction of a single yarn, the second letter indicates the initial twist direction, and the third letter indicates the secondary twist direction. 2.2 Pick distance
The length between a whole twist or two consecutive braid nodes in the same strand. Measured by a parallel line perpendicular to the axis of the rope, in mm (see Figure 2).
Approved by the State Administration of Technical Supervision on July 15, 1991 and implemented on April 1, 1992
2.3 Diameter
The diameter of the circumscribed circle under the measured tension. 2.4 Linear density
The weight of the rope per unit length.
2.5 Measurement of tension
GB13035-91
\1 Lap pitch:
Figure 2 Lap pitch of rope
The force acting on the rope when measuring the main characteristics of the rope (such as linear density). Ropes of different types and diameters have different measurement tension values, as shown in Table 1 and Table 2.
Table 1 Physical and mechanical properties of mulberry silk insulated rope (ZSZ) Model
SCjS-2
SCjS-4
SCjs-6
SCjS-8
SCjS-10
SCjs-12
SCjs-14
SCjS-16
SCjs-18
SCjS-20
SCjs-22
SC js-24
Diameter, mm
Nominal diameter
2
4
6
8
10
12
14
16
18
20
22
24
Note: The meaning of the model symbols is as follows:
s—mulberry;
C—silk
j-insulation;
S—rope.
Allowable deviation
±0.2
±0.2
±0.3
±0.3
±0. 4
±0.4
±0.4
±0.5
±0.5
±0.5
±0.5
Structure
(strand)
3
3
3×3
3×3
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
twist length
mm
7±0.3
13±0.3
18±0.3
24±0.3
32±0.3
37±0.5
42±0.5
48±0.5
56±0.5
62± 0.5
66±0.5
72±0.5
Linear density
g/m
2.5±0.2
12±0.2
19±0.3
42±0.5
61±1.0
90±1.0
115±1.5
155±1.5
190±2.0
22 0±3.0
266±3.0
315±4.0
Elongation
(not more than)
%
20
20
20
20
35
35
35
44
44
44
44
Breaking strength| |tt||(not less than)
kN
1.2
2.6
4.5
6.9
9.2
12.4
16.0
20.0
25.0
30.0
36.0
41.5
Measure tension
N
20
4 0
80
110
140
200
300
400
500
700
800
900
No.
Model
jCjs-2
jcjs-4
jCjs-6
jCjs-8
jCjs-10
jCjs-12
jCjs-14
jCjS-16
jcjs-18
jcjs-20
jCjs-22
jCjs-24
GB13035-91
Table 2 Physical and mechanical properties of nylon filament insulated rope (ZSZ) Diameter, mm
Nominal diameter
2
4| |tt||6
8
10
12
14
16
18
20
22
24
Allowable deviation
±0.2
±0.2
±0.3
±0.3
±0.3
±0.4
±0.4
±0. 4
±0.5
±0.5
±0.5
±0.5
Note: The meanings of the model symbols are as follows:
j—nylon;
C—filament;
j——insulation;
S rope.
2.6
5Breaking strength
The maximum pulling force that the rope can bear.
2.7 Elongation
Structure
(strand)
3
3×3
3×3
4×4+1
4×4+.1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
4×4+1
Tray length
mm
7±0.3
13±0.3
18±0.3
24±0.3
32±0.3
37±0.5
42±0.5
48±0.5
56±0.5
62±0.5
66±0.5
72±0.5
Linear density
g/m
2.6±0.2
13±0.2
20±0.2
44±0.5
63±1.0
93±1.0
117±1.5
157±1.5
193±2.0
222±3.0
268±3.0
318±4.0
Elongation
(not greater than)
%|| tt||40
40
40
40
48
48
48
48||tt| |58
58
58
58
Breaking strength
(not less than)
kN
1.4|| tt||3.1
5.4
8.0
11.0
15.0
20.2
26.0
32.0||tt| |38.0
44.0
50.0
When the external tensile force increases from the measured tension value to 75% of the minimum breaking strength of the rope, the length increase rate of the rope. The elongation is calculated according to the following formula:
where: A elongation;
L. =L × 100%
A
Lp
L, the length of the rope when the tensile force is 75% of the minimum breaking load, mm; L tensile force is the length of the rope when the tension is measured, mm. 3Material
Measuring Tension
N
10bZxz.net
20
40
80
130
180
250
300
400
500
600
700
3.1 Silk insulation rope should be unglued. Less than 25%, white, impurity-free long fiber mulberry silk is used as raw material. Use 2830, 18×3 or 2022, 25×3 mulberry silk strands to make a rope. 3.2 The nylon filament insulating rope should be made of white polycaprolactam (nylon 6) or other nylon filament fibers. It is made of 2103×3 strands or other nylon filament fiber lines as raw materials, and is twisted and twisted. 4. Technical requirements
4.1 The physical and mechanical properties of various insulated ropes should comply with the provisions of Table 1 and Table 2. 4.2 The electrical properties of various insulating rope elements should comply with the requirements in Table 3. Serial number
2
Test item
AC leakage current under high humidity
GB13035---91
Table 3 Electrical performance indicators of insulated rope||tt ||Push
Standard
At 100kV
(relative humidity 90%, temperature 20℃.24h) power frequency dry lightning voltage
4.3 process requirements: ||tt ||Not more than 300μA
Not less than 170kV
Effective length of test sample
0.5m
0.5m
Arrangement
Vertical arrangement
Vertical arrangement
4.3.1 Insulated ropes should be produced indoors with good ventilation and dust-proof equipment. During the production process, bare hands are not allowed to be touched, and they are not allowed to be contaminated with oil or moisture.
4.3.2 Each strand of rope and the wires in each strand should be tightly twisted, and there should be no looseness or splitting. 4.3.3 Each strand of the rope and the wires in each strand should not have defects such as overlap marks, bulges, bruises, back strands, cramps, etc., and there should be no disordered or intersecting wires, threads, or strands.
4.3.4 The joints should be connected by a single wire, and stranded joints are not allowed. Monofilament splices should be enclosed inside the strand and not exposed. 4.3.5 The spacing between strands and strands should be even throughout their entire length. 4.4 The manufacturing length of the insulating rope is 200m.
5 Test Methods
5.1 Sampling and Sample Processing
5.1.1 When extracting samples, cut off 10m from the end of each rope. Then, sample 6m inwards into pieces, and take three pieces in total. During sampling, it must be ensured that the sample cannot be withdrawn.
5.1.2 The sample should be placed in a standard environment (temperature 20 ± 2°C, relative humidity 63% ~ 67%) for more than 24 hours. In case of dispute, the specimen shall be placed under the standard temperature and humidity of the test for at least 48 hours before further testing. 5.2 Visual inspection of surface quality shall comply with the provisions of clauses 4.3.2 to 4.3.5. 5.3 Use a vernier caliper to measure the diameter in the twisting direction of the rope under tension. 5.4 Linear density measurement
Use a non-folding ruler with an accuracy of 1mm to measure a 1m sample under measuring tension, and weigh it with an industrial balance (sensitive to 0.01g). The reading is accurate to two decimal places. , modified to one decimal place according to GB8170 "Numerical Rounding Rules". 5.5 Breaking strength and elongation test
5.5.1 Test instrument
A strength testing machine with an elongation measuring device, which should meet the following requirements: The selection range of the strength testing machine dial should be within Within 20% to 75% of the entire dial; a.
b.
The maximum distance between the two clamps of the strength testing machine should be greater than 4m. 5.5.2 Operation method
a.
First place the rope sample into the jaws of the two clamps. The distance between the two clamps is 600mm for nylon filament and 1800mm for mulberry silk;|| tt||The inner surface of the clamp should be pasted with good padding (such as 0.5~1.2mm thick lead sheet), and buckles can be buckled on the outside of the specimen clamp to overcome the b.
slipping phenomenon;|| tt||c. Start the strength testing machine, stop stretching when the tension value reaches the measured tension value of the insulating rope, measure a distance of 500mm from the middle of the sample, and mark both ends. Start the strength testing machine again and stretch at a speed of 300mm/min until the rope's breaking strength is about 50%. Change the test speed to 250mm/min. Continue to stretch until the rope's breaking strength is about 75% and record the distance that has been marked. The elongation reading is taken until it breaks, and the breaking strength is recorded. 5.5.3 If the sample breaks at the clamp, the test is invalid and another sample needs to be taken for retest. 5.5.4 The test results should comply with the requirements in Table 1 and Table 2. 5.6 Electrical test
GB13035-91
5.6.1 Before the test, the sample should be placed in a drying oven at 50°C for 1 hour, and then kept under standard atmospheric conditions for 1 hour before testing. test.
5.6.2 Use 1.0mm diameter copper wire wound as the test electrode. 5.6.3 The sample should be hung vertically on the insulating bracket, with a 4.5kg weight suspended from the lower end. The sample layout is as shown in Figure 3. Porcelain bottles are supported on both sides, and epoxy insulating rods are used on the upper beam.
0.3m
0.5m
0.7m
1.5m
Figure 3 test layout
44444
1 1. support insulator, 2. epoxy insulating rod; 3. grounding electrode; 4. high voltage electrode; 5. 4.5kg weight | , carried out under the condition that the relative humidity is not greater than 80%, and the test results should comply with the requirements in Table 3.
5.6.5 Measurement of AC leakage current under high humidity refers to preconditioning the sample for 24 hours at a relative humidity of 90% and a temperature of 20°C, and then measuring the leakage current value in the test environment; the entire test process shall not exceed 10min, the results should comply with the requirements in Table 3. 5.6.6 The test voltage applied to the test sample should be measured on the high-voltage side. 6 Inspection Rules
6.1 Type Inspection
6.1.1 10% of the total number of products should be taken for visual inspection according to the provisions of 4.3.2~4.3.5. 6.1.2 Three samples should be taken from each batch of insulating ropes for the following inspections. 6.1.2.1 The diameter and distance of each specimen shall be measured at least in three places. 6.1.2.2· One sample shall be tested for breaking strength and elongation in three times. 3 One sample is subjected to electrical testing.
6.1.2.3
6.1.2.4
After weighing a sample, dissect the inside and check whether there are broken wires, contamination and debris. 6.1.3 If any of the inspected products fails one test, 2 times more samples should be taken for inspection. If they still fail, the batch of products will be deemed unqualified.
6.2 Factory inspection
6.2.1 30% of the total number of products leaving the factory should be selected for visual inspection in accordance with the provisions of 4.3.2~4.3.5. 6.2.2 10% of each batch of insulating ropes should be taken for diameter and pitch measurement. GB13035-91
6.2.3 All products should be subjected to a 1-minute power frequency withstand voltage test before leaving the factory. The test voltage is 125kV and the test electrode distance is 0.5m.
7Packaging logo
7.1. After the insulated rope is rolled, it should be sealed in a plastic bag and placed in a special carton or plastic barrel. The box and barrel should be marked with the following items: a. Trademark;
b. Product name, model;
c. Weight (net weight, gross weight), unit kg;
must have moisture-proof, high-temperature protection and other signs
d.
e. Factory date, year, month.
7.2 The bag must contain a certificate of conformity, and the following items must be marked on the certificate: a.. Manufacturer’s name and address;
b. Product name, model;
c. Inspector's mark;
d． Technical inspection department mark;
Production batch number or production team;
e.
f. Manufacturing date, year, month.
Additional notes:
This standard is proposed by the Ministry of Energy of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Live Work. This standard is drafted by Beijing Power Supply Bureau. The main drafters of this standard are Sun Jing, Song Huanjia, Chen Zhong,
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.