AS 61466.1-2020 pdf free.Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V Part 1: Standard strength and end fttings (IEC 61466-1:2016 (ED 2.0) MOD).
4 Plan of the standard
This standard includes eleven standard SML classes designated for use together with 10 different series of couplings as follows.
— Two different standard series of ball couplings, one according to IEC 60120 and one. type N, as shown in Annex A of this standard.
— Two different standard series of socket couplings, one according to IEC 60120 and one, type N, as shown in Annex A of this standard.
— Two different standard series of tongue couplings, one, type L, according to IEC 60471 and one, type N, as shown in Annex B of this standard.
— Two different standard series of clevis couplings, one, type L, according to IEC 60471, and one, type N, as shown in Annex B of this standard
— One standard series of Y clevis couplings, as shown in Annex C of this standard.
— One standard series of eye couplings as shown in Annex D of this standard.
5 Insulator designation
Insulators are designated in Table I by letter CS followed by a number indicating the specified mechanical load (SML) in kilonewtons. The letter B, S, T, C. Y or E or a combination thereof which follows specifies a ball, socket, tongue, clevis, Y-clevls or eye coupling, see Figure 1. The following figures specify the size of the coupling. When a combination of couplings are used, the first letter shall always express the coupling on the upper end of the insulator. The upper end of the insulator is defined in relation to the slope of the sheds. In the case of symmetrical profile of the sheds any order of the letters is acceptable.
As examples, possible designations could be:
CS 120 S/B16 indicates a composite insulator having a SML equal to 120 kN, a socket coupling according to lEG 60120, size 16, at the upper end and a ball coupling according to IEC 60120, size 16, at the other end.
CS 120 C/T19N indicates a composite insulator having a SML equal to 120 kN, a clevis coupling according to Annex B, size 19N, at the upper end and a tongue coupling according to Annex B. size 19N, at the other end.
Fittings of the same series conforming to different standards (e.g. IEC 60120 and Annex A of this part of IEC 61466) should be avoided on the same insulator.
6 Marking
Each insulator shall be clearly and indelibly marked with the name or trademark of the manufacturer, the year of manufacture, the specified mechanical load (SML) and a means permitting identification of each of the component parts.
7 Composite insulator units
The values of the specified mechanical loads (SML) for composite string insulators together with corresponding coupling sizes are given in Table 1.
The designation letters of the different designs of couplings which may be used in any combination are shown in Figure 1.AS 61466.1 pdf download.