QB/T 4250-2011 (English Version) PDF

Scope: This standard specifies the product classification, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of 500kV transformer inter-turn insulation paper. This standard is applicable to the insulation paper used in the manufacture of 500kV transformers.

QB/T 4250-2011 Referenced Document

GB/T 10342 Paper--Package and mark
GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp specimens*， 2023-12-28 Update
GB/T 12914 Determination of tensile strength of paper and paperboard Constant speed tensile method (20mm/min)*， 2019-07-01 Update
GB/T 1545-2008 Paper,board and pulp.Determination of acidity or alkalinity
GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)*， 2013-02-15 Update
GB/T 3333 Cable paper--Determination of electrical strength at powerfrequence
GB/T 3334 Method of test for dissipation factor (tgδ) of cable paper at power frequence (Schering bridge method)
GB/T 450 Paper and board.Sampling for testing and identification of machine and cross direction,wire side and felt side
GB/T 451.1 Paper and board--Determination of size and deviation
GB/T 451.3 Paper and board determination of thickness
GB/T 455 Pulp and board determination of tearing resistance
GB/T 458-2008 Paper and board.Determination of air permeance
GB/T 462 Determination of moisture content of analytical samples of paper, paperboard and pulp*， 2023-09-07 Update
GB/T 742 Fibrous raw material, pulp, paper and board—Determination of residue(ash) on ignition at 575℃ and 900℃*， 2018-12-28 Update
GB/T 7977 Paper,board and pulps.Determination of conductivity of aqueous extracts

QB/T 4250-2011 500kV transformer coil winding paper has been changed from QB/T 3521-1999 500kV transformer turn-to-turn insulation paper.