SIST EN 60168:1997/A1:1998

Tests on indoor and outdoor post insulators of ceramic material or glass for systems with nominal voltages greater than 1 kV

EN following parallel vote

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

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)

General Information

• Status: Published
• Publication Date: 31-Oct-1998
• ICS: 29.080.10 - Insulators
• Technical Committee: IZL - Insulators
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1998
• Due Date: 01-Nov-1998
• Completion Date: 01-Nov-1998
• Ref Project: EN 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

Relations

• Amends: SIST EN 60168:1997 - Tests on indoor and outdoor post insulators of ceramic material or glass for systems with nominal voltages greater than 1 kV
• Effective Date: 21-Sep-2010

Overview

EN 60168:1994/A1:1997 (IEC 60168:1994/A1:1997) specifies test methods and acceptance criteria for indoor and outdoor post insulators made of ceramic material or glass for systems with nominal voltages greater than 1 kV. This amendment clarifies selection and extension of type tests, routine and sample tests, mounting arrangements for testing, and permitted manufacturing tolerances and surface conditions.

The standard is intended to ensure reliable electrical performance and mechanical integrity of post insulators used in high-voltage installations and distribution equipment.

Key Topics

• Scope and applicability

  • Tests apply to ceramic and glass post insulators for systems with nominal voltages > 1 kV.
  • Switching-impulse withstand voltages are specified only for post insulators on a.c. systems with highest voltage for equipment above 245 kV.

• Type test selection and extension

  • Normally one post insulator is subjected to each type test.
  • Test specimens must have passed routine and sample tests (except the sample mechanical test) prior to type testing.
  • Results from an insulator of "electrically equivalent design" may be extended to similar designs when they meet specified criteria (arcing distance, core diameter, metal fitting number/position, shed spacing and projection, shed profile).
  • Results from a "mechanically equivalent design" may be extended when core diameter, fitting connection design, metal fitting shapes and nominal height criteria align.

• Mounting and test arrangements

  • Standard mounting arrangements differ depending on whether switching impulse tests are required.
  • For switching-impulse-not-required arrangements: post insulators are mounted vertically on a horizontal earthed metal support placed at defined heights above ground (e.g., about 1 m for insulators ≤1.80 m and ≥2.50 m for taller units). A horizontal cylindrical conductor (length ≈ 1.5× insulator height; diameter ≈ 1.5% of height, min. 25 mm) is attached to the top.

• Manufacturing tolerances and surface quality

  • On ceramic cores, surface defects such as chips and cracks are not permitted; areas up to 25 mm without glaze and small inclusions in glaze are allowed.

• Routine and sample tests

  • The amendment updates routine test tables and clarifies where alternatives (e.g., unassembled unit testing) may be agreed between purchaser and manufacturer.
  • Mechanical routine tests differentiate by insulator height (threshold example: 770 mm for bending vs tensile tests).

Applications

• Type approval and quality control for post insulators used in substations, switchgear and overhead line terminations.
• Supplier and purchaser agreements on test methods, mechanical verification and acceptance criteria.
• Factory production checks and final inspection to ensure conformity with electrical and mechanical requirements.

Related Standards

• IEC/EN standards on insulators and high-voltage equipment (for cross-reference and normative citation). The amendment also updates bibliography entries (e.g., reference to IEC 61264:1994) and renumbers other references as specified.

For procurement, conformity assessment and engineering teams, EN 60168:1994/A1:1997 provides the test framework to verify post insulator performance, support interchangeability claims, and reduce field failures in high-voltage systems.

Standards Content (Sample)

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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Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
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Commission Electrotechnique Internationale
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International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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
...