EN 60168:1994/A1:1997

SLOVENSKI STANDARD
01-november-1998
Tests on indoor and outdoor post insulators of ceramic material or glass for
systems with nominal voltages greater than 1 kV (IEC 60168:1994/A1:1997)
Tests on indoor and outdoor post insulators of ceramic material or glass for systems with
nominal voltages greater than 1 kV
Prüfungen an Innenraum- und Freiluft-Stützisolatoren aus keramischem Werkstoff oder
Glas für Systeme mit Nennspannungen über 1 kV
Essais des supports isolants d'intérieur et d'extérieur, en matière céramique ou en verre,
destinés à des installations de tension nominale supérieure à 1 kV
Ta slovenski standard je istoveten z: EN 60168:1994/A1:1997
ICS:
29.080.10 Izolatorji Insulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
STANDARD
AMENDEMENT 1
AMENDMENT 1
1997-06
Amendement 1
Essais des supports isolants d'intérieur
et d'extérieur, en matière céramique ou en verre,
destinés à des installations de tension nominale
supérieure à 1 000 V
Amendment 1
Tests on indoor and outdoor post insulators of
ceramic material or glass for systems with
nominal voltages greater than 1 000 V
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60168 Amend. 1 © IEC:1997 – 3 –
FOREWORD
This amendment has been prepared by subcommittee 36C: Insulators for substations, of IEC
technical committee 36: Insulators.
The text of this amendment is based on the following documents:
FDIS Report on voting
36C/81/FDIS 36C/89/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
__________
Page 19
2.2 Values which characterize a post insulator
Replace the footnote by the following:
* Switching-impulse withstand voltage should be specified only for post insulators for use on a.c. systems with
highest voltage for equipment above 245 kV.
Page 21
3.1.1 Type tests
Replace, on page 23, the existing text of the last paragraph by the following:
The type tests shall be carried out on insulator(s) which have passed all the requirements for
the routine and the sample tests, except the sample mechanical test.
Page 23
3.3.1 Insulator selection for type tests
Replace the text of this subclause by the following:
Normally, only one post insulator shall be subjected to each test. The test shall be carried out
on an insulator which has passed all the requirements for the routine and the sample tests,
except the sample mechanical test. Insulators which have been submitted to type tests which
may affect their mechanical and/or electrical characteristics shall not be used in service.

60168 Amend. 1 © IEC:1997 – 5 –
Page 25
3.3.3 Electrical type tests
Replace the second paragraph of this subclause by the following:
The results obtained during the electrical type tests on a post insulator of "electrically
equivalent design" shall be extended to all post insulators represented by it. These are
insulators made with the same materials and having the following characteristics when
compared with the post insulator of "electrically equivalent design":
a) the arcing distance is the same or greater;
b) the nominal core diameter is the same or smaller;
c) the number and approximate position of metal fittings is the same;
d) the nominal shed spacing is the same within ±5 %;
e) the nominal shed projection is the same within ±10 %;
f) the shed profile is the same.
3.3.4 Mechanical failing load type tests
Replace, on page 27, the first paragraph of this subclause by the following:
The results obtained during the mechanical failing load type tests on a post insulator of
"mechanically equivalent design" shall be extended to all post insulators represented by it.
These are insulators made in the same factory, with the same materials, and by the same
manufacturing process, and having the following characteristics, when compared with the post
insulator of "mechanically equivalent design:"
a) the nominal core diameter is the same;
b) the design of the connection between the insulating component and the metal fittings is
the same;
c) the shape and size of the parts of the metal fittings which connect to the insulating
components are the same;
d) the nominal height does not differ by more than ±20 %.
Page 33
4.4.1 Standard mounting arrangement of a post insulator for use in systems with highest
voltage of equipment below 300 kV
Replace the title of this subclause and first and second paragraphs by the following:
4.4.1 Standard mounting arrangement of a post insulator when switching impulse tests
are not required
The post insulator shall be mounted vertically upright on a horizontal earthed metal support
consisting of a U-channel section with the flanges pointing downwards. This metal supp
...