This standard specifies the technical specifications for 500kV transformer interturn insulation paper. This standard applies to interturn insulation paper for transformers and reactors with a rated voltage not exceeding 50okV. QB/T 3521-1999 500kV transformer interturn insulation paper QB/T3521-1999 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
500kV Transformer Turn-to-Turn Insulation Paper
This standard adopts IEC554-3-5 (1984) "Specification for Special Electrical Paper (5A.2)". Subject content and scope of application
This standard specifies the technical specifications for 500kV transformer turn-to-turn insulation paper. This standard is applicable to transformers, reactors and other voltage insulation papers with rated voltage not exceeding 500kV. 2 Reference standards
GB/T450 Paper and paperboard sampling
GB/T451.1 Determination of size and deflection of paper and paperboardDetermination of basis weight of paper and paperboard
GB/T 451.2
Determination of thickness of paper and paperboard
GB/T 451.3
GB/T 453
Determination of tensile strength of paper and paperboard (constant rate loading method)GB/T 455.1
GB/T 455.2
GB/T 458
GB/T 462
GB/T 463www.bzxz.net
Determination of tearing strength of paper
Determination of tearing strength of paperboard
Determination of air permeability of paper and paperboard (Schober method)Determination of moisture content of paper and paperboard
Determination of ash content of paper and paperboard
Determination of pH of aqueous extracts of paper, paperboard and pulpGB/T 1545. 2
GB/T 2828
GB/T3333
GB/T3334
GB/T 7976
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Cable paper power frequency breakdown voltage test method
Cable paper dielectric loss tangent (tgo) test method (bridge method) Insulation paper and paperboard water extract conductivity determination GB/T10342 Paper packaging and marking
3 Product classification
3.1500kV transformer interturn insulation paper, according to the paper thickness is divided into two varieties: BZZ-075 nominal thickness of 75μm;
QB/T3521—1999
Replace ZBY32020—1989
BZZ-125 nominal thickness of 125μm.
3.2500kV transformer interturn insulation paper is roll paper. The roll width is (625 ± 5) mm, the roll diameter is 550 ~ 650 mm, or as specified in the order contract.
4 Technical requirements
4. The technical indicators of 1500kV transformer interturn insulation paper must comply with the provisions of Table 1. Approved by the State Bureau of Light Industry on April 21, 1999
Implemented on March 1, 1999
Tensile strength
Elongation
Air permeability
Indicator name
Transverse tearing strength
Electrical conductivity of water extract
PH value of water extract
Sodium content in ash
Power frequency breakdown strength
Dry paper dielectric loss tangent
(tga100℃)
Not less In
not less than
not greater than
not less than
not greater than
QB/T3521--1999
(kgf/15mm)
μm/(Pa·s)
(mL/min)
mN(gf)
not greater than
not greater than
not less than
not greater than
4.2 The fiber structure of paper should be uniform and the paper surface should be flat. %
BZZ-075
BZZ-125
125±7
0.95±0.05
6. 00(9.2)
2. 60(4. 0)
500(51.2)
9.20(14.0)
4.20(6.5)
0.255(15)
1015(103)
4.3 The cutting edge of paper should be neat and clean. There should be no cracks on the end of the roll. The bow should not exceed 15mm and the serration should not exceed 5mm. 4.4 The paper surface should not have folds, wrinkles, transparent spots and steam spots, spots, dull and shiny streaks, undissociated fiber bundles, carbon particles, various conductive impurities and holes visible to the naked eye.
4.5 The maximum length of pulp blocks not exceeding 40mm shall not exceed 4 per roll. 4.6 The two sides of the roll shall be consistent in tightness, and each roll shall not exceed 3 broken ends, and the broken ends shall be clearly marked. 5 Test method
The sample shall be taken in accordance with the provisions of GB/T450. The paper size shall be in accordance with GB/T451.1.
The thickness of the paper shall be in accordance with GB/T451.3.
The basis weight of the paper shall be in accordance with GB/T451.2.
The air permeability shall be measured in accordance with GB/T458 (Schuber method), and the tensile strength shall be measured in accordance with GB/T453.
Tear strength shall be measured in accordance with GB/T455.1 and GB/T455.2. The conductivity of the water extract shall be measured in accordance with GB/T7976. 5.9 The pH value of the water extract shall be measured in accordance with GB/T1545.2. The ash content shall be measured in accordance with GB/T463.
The sodium content in the ash shall be measured in accordance with Appendix A of this standard. The power frequency breakdown voltage shall be measured in accordance with GB/T3333. 567
QB/T3521--1999
5.13 The dielectric loss tangent (tg) shall be measured in accordance with GB/T3334. 5.14 The moisture content shall be measured in accordance with GB/T462.
6 Inspection rules
6.1 The quantity delivered at one time is a batch, but not more than 50t. The manufacturer shall ensure that the paper produced meets the requirements of this standard. Each roll of paper shall be accompanied by a certificate of conformity, and each batch of paper shall be accompanied by a quality inspection report. 6.2 The delivery inspection shall be carried out in accordance with the provisions of GB/T2828, the sample unit is simple, the inspection level is S-3, and the secondary normal sampling. The delivery inspection unqualified classification, sampling plan, qualified quality level and sampling number, and judgment number shall be in accordance with the provisions of Table 2. Table 2
Sampling plan
Batch, simple
51~150
151~280
Sample size
Normal secondary sampling
Inspection level S-3
Class B nonconforming products
Class C nonconforming products
Classification of nonconformity
Nonconforming
Tensile strength
Tear strength
Sodium content in ash
Nonconforming
Air permeability
Elongation
Conductivity
6.3 stipulates that there shall be no nonconformity in power frequency breakdown strength and dielectric loss tangent. 6.4 The user has the right to check whether the quality of the batch of products meets the requirements of this standard. If the user has any objection to the quality of the product, he should notify the manufacturer within three months after the arrival of the goods to jointly take samples for re-inspection. If it does not meet the requirements of this standard, it will be judged as a batch unqualified and the manufacturer will be responsible for handling it. 7 Marking, packaging, transportation, storage
7.1 The inner layer of the packaging of the roll must use two layers of asphalt moisture-proof paper, and a layer of plastic film to fully wrap it, plug it, and wrap it with five layers of packaging paper with a quantitative of not less than 100g/m, and fully apply water glass. 7.2 On the two ends of the roll, fold the packaging paper flat, flatten it with a capping machine, paste a layer of round packaging paper with a diameter close to the diameter of the paper roll on the end surface, and then paste the packaging mark in the direction indicated by the arrow, and then squeeze and iron it with a capping machine. Finally, use a braided belt to tie each end of the roll. The braided belt must be tightened to prevent it from falling off.
7.3 Others shall be carried out in accordance with GB/T10342.
7.4 Paper rolls should be properly stored to prevent them from being affected by rain, snow, ground moisture and chemicals. 7.5 Canopied and clean transport vehicles should be used for transportation to prevent product contamination. 7.6 During transportation and stacking, rolls must not be dropped from heights. 568
QB/T 3521—1999
Appendix A
Determination method for sodium ion content in ash
(Supplement)
The determination method is based on the determination of the activity of sodium ions in water-soluble matter after ashification, acid dissolution, evaporation and water dilution of pulp to determine its sodium ion content. A Applicable instruments
a. Commonly used analytical instruments;
b. DWS-51 sodium ion concentration meter.
A2 Chemicals
11 Hydrochloric acid;
b. Concentrated hydrochloric acid;
c. Standard Na+ solution (positioning solution).
PNaa positioning solution: weigh 0.0.117g of standard sodium chloride reagent dried at 250~350℃ for 1~2h is dissolved in 2kg of sodium-free water (Na+ ions are less than 2×10-9), which is 0.0001mol/L standard Na+ positioning solution (equivalent to 23×10-6Na+ solution). The solution should be stored in a plastic container.
PNa positioning solution: Use a pipette to accurately draw 50mL PNa4 solution into a 500mL volumetric flask, and dilute to the scale with sodium-free water less than 2×10-9Na+ to obtain PNas solution. For the preparation method, see the instrument manual.
A3 Determination steps
Weigh 5g of air-dried sample (accurate to 0.0001g), one portion is used to determine the moisture content, and the other portion is placed in a porcelain crucible, first carbonized at low temperature, then moved into a high-temperature furnace, and burned at (575±25)℃ until there is no black carbon. After cooling, add 2mL of 1:1 hydrochloric acid to dissolve, heat on a hot plate to evaporate to dryness, then add 2mL of 1:1 hydrochloric acid solution to evaporate to dryness, and finally add 2mL of concentrated hydrochloric acid to evaporate to dryness. After cooling, dissolve the residue in portions with sodium-free water and transfer to a 250mL volumetric flask, dilute to the scale, and measure with a DWS-51 sodium ion concentration meter. First, use PNa4 or PNas solution to locate, and at the same time perform a blank test. A4 Operation of the DWS-51 sodium ion concentration meter The operation of the DWS-51 sodium ion concentration meter is carried out according to the instrument manual. A5 Calculation
Sodium content is calculated according to formula (A1):
(Na,+-Na2+)×1000
Sodium ion content (mg/kg)
Gx1000
Nai+-Na,+
Wherein: Na+-PNa measured by the sample converted into Na+ value, mg; Naz+-PNa measured by the blank converted into Na+ value, mg; G-absolute dry sample mass, g.
Additional instructions:
QB/T3521
This standard was proposed by the Paper Industry Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Paper Standardization Center. This standard was drafted by Leshan Paper Mill in Sichuan Province, and the main drafters of this standard were Peng Hong, Tao Lixia, Zhang Lan, and Chen Wenfeng. This standard refers to the Soviet standard TOCT645-1979 "Cable Paper". 570
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