IEC 60433-2021 pdf free download – Insulators for overhead lines with a nominal voltage above 1 000 V – Ceramic insulators for AC systems – Characteristics of insulator units of the long rod type.
This Intermnational Standard is applicable to string insulator units of the long rod type withinsulating parts of ceramic material intended for use in AC overhead power lines with anominalvoltage greater than 1 000 v and a frequency not greater than’100 Hz. lt is alsoapplicable to insulators of similar design, used in substations.
This document is applicable to ceramic string insulator units of the long rod type, either with a
clevis end fitting at both ends for coupling with a tongue,or with a socket end fitting at bothends for coupling with a pin ball.
The object of this document is to prescribe specified values for electrical and mechanicalcharacteristics,and for the principal dimensions of ceramic string insulator units of the longrod type.
This document is applicable to string insulator units for use on overhead lines situated inlightly polluted areas，and the creepage distances given in Table 1 have been establishedaccordingly,using the EC TS 60815-2recommendation of 27,8 mmIkV for SPs class.However，shorter creepage distances are applicable for use in some non-polluted areas. lfspecific operating conditions require or allow non-standard(longer or shorter) creepagedistances, the mechanical characteristics as well as the lengths L (see Clause 4) of thisdocument are intended to be used unless the need for exceptionally long creepage distances
requires values of L greater than those given in Table 1. ln the case of special requirements,e.g.very heavy polluted areas and for other particular or extreme environmental conditions, itmay be necessary for certain dimensions to be changed.
As far as reasonably applicable, this document is also applicable to be applied to similarinsulator units outside the scope of this standard, such as insulators for electric traction lines.
This document does not include tests on insulators and dimensions of end fittings.
Ball and socket couplings are covered by IEC 60120, clevis and tongue couplings bylEC 60471.
NOTE 1 For the definition of site pollution severity,see applicable part of lEC TS 60815.
NOTE 2 The term “ceramic”is used in this document to refer to porcelain materials and,contrary to NorthAmerican practice,does not include glass.
2 Normative references
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document. For dated references，only the editioncited applies.For undated references, the latest edition of the referenced document (inciuding
any amendments) applies.
IEC 60383-1，Insulators for overhead lines with a nominal voltage above 1 000 v – Part 1:Ceramic or glass insulator units for AC systems – Definitions,test methods and acceptancecriteria
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
IEC Electropedia: available at http://www.electropedia.org/
ISO Online browsing platform: available at http://www.iso.org/obp
3.1
long rod insulator
suspension or tension insulator consisting of an approximately cylindrical insulating part provided with sheds and equipped at the ends with external metal fittings
Note 1 to entry: The insulator is designed in such a manner that the shortest puncture path through solid insulating material is at least equal to half the arcing distance. Therefore it is a class A insulator according to IEC 60383-1.IEC 60433 pdf download.