EN 61325:1995
(Main)Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic or glass insulator units for d.c. systems - Definitions, test methods and acceptance criteria
Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic or glass insulator units for d.c. systems - Definitions, test methods and acceptance criteria
Is applicable to string insulator units of ceramic material or glass for use on d.c. overhead power lines with a nominal voltage greater than 1 000 V. This standard specifies: -the characteristics of insulators; -the conditions under which the specified values of these characteristics shall be verified; -acceptance criteria
Isolatoren für Freileitungen mit einer Nennspannung über 1 kV - Keramik- oder Glasisolatoren für Gleichspannungssysteme - Begriffe, Prüfverfahren und Annahmekriterien
Isolateurs pour lignes aériennes de tension nominale supérieure à 1 kV - Eléments d'isolateurs en céramique ou en verre pour systèmes à courant continu - Définitions, méthodes d'essai et critères d'acceptation
Est applicable aux chaînes d'isolateurs en matière céramique ou en verre destinés aux lignes aériennes de transport d'énergie fonctionnant en cournat continu à une tension nominale supérieure à 1 000 V. La présente norme spécifie: - les caractéristiques des isolateurs; - les conditions dans lesquelles les valeurs spécifiées de ces caractéristiques doivent être vérifiées; - les conditions d'acceptation.
Insulators for overhead lines with a nominal voltage above 1000 V - Ceramic or glass insulator units for d.c. systems - Definitions, test methods and acceptance criteria (IEC 1325:1995)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-1997
Insulators for overhead lines with a nominal voltage above 1000 V - Ceramic or
glass insulator units for d.c. systems - Definitions, test methods and acceptance
criteria (IEC 1325:1995)
Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic or glass
insulator units for d.c. systems - Definitions, test methods and acceptance criteria
Isolatoren für Freileitungen mit einer Nennspannung über 1 kV - Keramik- oder
Glasisolatoren für Gleichspannungssysteme - Begriffe, Prüfverfahren und
Annahmekriterien
Isolateurs pour lignes aériennes de tension nominale supérieure à 1 kV - Eléments
d'isolateurs en céramique ou en verre pour systèmes à courant continu - Définitions,
méthodes d'essai et critères d'acceptation
Ta slovenski standard je istoveten z: EN 61325:1995
ICS:
29.080.10 Izolatorji Insulators
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1995-03
Isolateurs pour lignes aériennes
de tension nominale supérieure à 1 000 V —
Eléments d'isolateurs en céramique ou en verre
pour systèmes à courant continu —
Définitions, méthodes d'essai et critères
d'acceptation
Insulators for overhead lines with a nominal
voltage above 1 000 V —
Ceramic or glass insulator units
for d.c. systems —
Definitions, test methods and acceptance
criteria
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1325 © IEC:1995 – 3 –
CONTENTS
Page
FOREWORD 9
SECTION 1: GENERAL
Clause
1 Scope
2 Normative references
3 Definitions
SECTION 2: INSULATORS
4 Insulator classes and type
5 Insulating materials
23 6 Specified characteristics and features of a d.c. insulator unit
7 Identification of insulators
SECTION 3: CLASSIFICATION OF TESTS, SAMPLING RULES AND PROCEDURES
8 Classification of tests.
27 8.1 Type tests
8.2 Sample tests
8.3 Routine tests
9 Quality assurance 29
29 10 Procedures for type and sample tests
10.1 Insulator selection for type tests
29 10.2 Sampling rules and procedures for sample tests
31 10.3 Re-test procedure for the sample tests
SECTION 4: TEST PROCEDURES FOR ELECTRICAL TESTS
11 General requirements for high-voltage tests.
12 Standard atmospheric conditions and correction factors for electrical tests
33 12.1 Standard reference atmosphere
33 12.2 Correction factors for atmospheric conditions
35 13 Mounting arrangements for electrical tests
14 Lightning impulse voltage tests
14.1 Test procedure
37 14.2 Acceptance criteria
15 Dry d.c. voltage tests
15.1 Test procedure
15.2 Acceptance criteria
16 SF6 puncture withstand test
16.1 Test method
16.2 Acceptance criteria 39
17 Impulse overvoltage puncture withstand test 39
1325 © I EC:1995 - 5 -
Page
Clause
18 Ion migration test 39
39 18.1 Reference conditions used to calculate the expected charge
18.2 Test validity 39
18.3 Test procedure
18.4 Acceptance criteria
19 Electrical body resistance test
19.1 Test procedure
19.2 Acceptance criteria
20 Thermal runaway test
20.1 Duration
20.2 Procedure
20.3 Acceptance criteria
21 Routine electrical test
SECTION 5: TEST PROCEDURES FOR MECHANICAL AND OTHER TESTS
22 Verification of the dimensions
23 Electromechanical failing load test 49
23.1 Test procedure 49
23.2 Acceptance criteria
icient for type tests 23.3 Coeff
icients for sample tests 23.4 Coeff
24 Mechanical failing load test
24.1 Test procedure
24.2 Acceptance criteria
55 25 Thermal-mechanical performance test
25.1 Test procedure
25.2 Acceptance criteria
26 Residual mechanical strength test
26.1 Previous tests
26.2 Preparation of the test pieces.
26.3 Test procedure
26.4 Test results
57 26.5 Acceptance criteria for the type test
26.6 Acceptance criteria for the sample test
57 26.7 Comparison between type and sample test results
59 27 Verification of the axial, radial and angular displacements
27.1 Test procedure
59 27.2 Acceptance criteria for cap and pin insulators
27.3 Acceptance criteria for long rod insulators
28 Verification of the locking system
28.1 Conformity of the locking device
61 28.2 Verification of locking
28.3 Position of the locking device
28.4 Procedure for the operation test
28.5 Acceptance criteria for the operation test
— 7 —
1325 ©IEC:1995
Page
Clause
29 Temperature cycle test
29.1 Test procedure for string insulator units composed of ceramic material
29.2 Special test procedure for insulators with thick sections or very large insulators
65 29.3 Complementary specifications
29.4 Acceptance criteria
30 Thermal shock test
30.1 Test procedure
67 30.2 Acceptance criteria
31 Porosity test
31.1 Test procedure
31.2 Acceptance criteria
32 Galvanizing test
32.1 Test procedures
32.2 Acceptance criteria 69
71 33 Routine visual inspection
33.1 Insulators with ceramic insulating parts 71
73 33.2 Insulators with glass insulating parts
34 Routine mechanical test
35 Zinc sleeve test
75 35.1 General requirements concerning the zinc sleeve
35.2 Type test procedure
75 35.3 Sample test procedure
36 Zinc collar test
75 36.1 General requirements for zinc collar
77 36.2 Type and sample test procedure
SECTION 6: TESTS ON STRING INSULATOR UNITS
37 General
Tables 80
Figures
Annexes
A — Method of comparison of the results of the electromechanical or mechanical failing load type
89 and sample tests
B — Bibliography
1325 ©IEC:1995 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V -
Ceramic or glass insulator units for d.c. systems -
Definitions, test methods and acceptance criteria
FOREWORD
1) The IEC (International Electrotechnical Commission) is a world-wide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the lEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on which
2)
all the National Committees having a special interest therein are represented, express, as nearly as possible, an
international consensus of opinion on the subjects dealt with.
3) They have the form of recommendations for international use published in the form of standards, technical
reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
er.
indicated in the latt
International Standard IEC 1325 has been prepared by sub-committee 36B: Insulators for
overhead lines, of IEC technical committee 36: Insulators.
The text of this standard is based on the following documents:
DIS Report on voting
36B(CO)112 36B/135/RVD
Full information on the voting for approval of this standard can be found in the report on voting
indicated in the above table.
Annexes A and B are for information only.
1325 @ IEC:1995 - 11 -
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V —
Ceramic or glass insulator units for d.c. systems —
Definitions, test methods and acceptance criteria
Section 1: General
1 Scope
This International Standard is applicable to string insulator units of ceramic material or glass
for use on d.c. overhead power lines with a nominal voltage greater than 1 000 V.
It is not applicable to composite insulators.
The application of this standard to insulators for use in other situations under d.c. voltage
will be left to the relevant technical committees.
This standard specifies:
- the characteristics of insulators;
- the conditions under which the specified values of these characteristics shall be
verified;
- acceptance criteria.
It specifies basic characteristic tests in a manner similar to that of IEC 383-1. Certain
additional tests have been found to be necessary to ensure satisfactory long-term
performance of d.c. insulators. At present, these additional tests concern only cap and pin
insulators.
In view of the lack of significant performance data regarding long rod insulators on d.c.
lines, it is not possible at present to define or validate special d.c.-oriented tests for such
insulators.
This standard does not include requirements, or special tests, dealing with the choice of
insulators for specific operating conditions (e.g. ageing arising from specific operating
conditions).
NOTES
1 This standard does not include radio interference tests, artificial pollution tests or tests on insulator
sets. These subjects and some relevant test methods are dealt with in the following IEC Publications:
IEC 383-2, IEC 437 and IEC 1245.
2 Many of the requirements and tests in this standard are relevant to insulators for use on d.c. traction
lines, but other tests may be required. Reference can be made to IEC 383-1.
1325 © IEC:1995 - 13 -
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent edition of the normative documents indicated below. Members of
maintain registers of currently valid International Standards.
IEC and ISO
IEC 50(471): 1984, International Electrotechnical Vocabulary (IEV) - Chapter 471: Insulators
High-voltage test techniques - General definitions and test requirements
IEC 60-1: 1989,
IEC 120: 1984, Dimensions of ball and socket couplings of string insulator units
Characteristics of string insulator units of the cap and pin type
IEC 305: 1978,
Locking devices for ball and socket couplings of string insulator units -
IEC 372: 1984,
Dimensions and tests
Insulators for overhead lines with a nominal voltage above 1 000 V - Part 1:
IEC 383-1: 1993,
Ceramic or glass insulator units for a.c. systems - Definitions, test methods and acceptance
criteria
IEC 433: 1980, Characteristics of string insulator units of the long rod type
Dimensions of clevis and tongue couplings of string insulator units
IEC 471: 1977,
Residual strength of string insulator units of glass or ceramic material for
IEC 797: 1984,
overhead lines after mechanical damage to the dielectric
Insulators of ceramic material or glass for overhead lines with a nominal
IEC 1211: 1994,
voltage greater than 1 000 V - Puncture testing
Artificial pollution tests on high-voltage insulators to be used on d.c. systems
IEC 1245: 1993,
Metallic coatings - Protection against corrosion by hot dip galvanizing -
ISO 1459: 1973,
Guiding principles
Metallic coatings - Hot dip galvanized coatings on ferrous metals -
ISO 1460: 1992,
Gravimetric determination of the mass per unit area
Metallic coatings - Hot dip galvanized coatings on fabricated ferrous products
ISO 1461: 1973,
- Requirements
Metallic and oxide coatings - Measurement of coating thickness -
1463: 1982,
ISO
Microscopical method
1325 ©IEC:1995 - 15 -
ISO 2064: 1980, Metallic and other non-organic coatings - Definitions and conventions
concerning the measurement of thickness
2178: 1982,
ISO Non-magnetic coatings on magnetic substrates - Measurement of coating
thickness - Magnetic method
3 Definitions
For the purpose of this International Standard the following definitions apply.
The term "insulator" is used in this standard to refer to the object being tested.
The definitions given below are those which either do not appear in IEC 50(471) or differ
from those given in IEC 50(471).
3.1 Insulator string
One or more connected string insulator units intended to give flexible support to overhead
line conductors and stressed mainly in tension.
3.2 Lot
A group of insulators offered for acceptance from the same manufacturer, of the same
design and manufactured under presumed similar conditions of produc
...
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