HD 437 S1:1984

SLOVENSKI STANDARD
01-oktober-1998
Standard conditions for use prior to and during the testing of solid electrical
insulating materials (IEC 60212:1971)
Standard conditions for use prior to and during the testing of solid electrical insulating
materials
Standardbedingungen für die Anwendung vor und während der Prüfung von festen
Elektroisolierstoffen
Conditions normales à observer avant et pendant les essais de matériaux isolants
électriques solides
Ta slovenski standard je istoveten z: HD 437 S1:1984
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
Deuxième édition
STAN DARD
Second edition
Conditions normales à observer avant et pendant
les essais de matériaux isolants électriques solides
Standard conditions for use prior to and during
the testing of solid electrical insulating materials
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— 3 --
CONTENT S
Page
FOREWORD 5
PREFACE 5
Clause
1. General 7
2. Scope 7
3. Definitions 7
4. Temperature and humidity (or liquid immersion) recommended for preconditioning, condi-
tioning and testing 9
5. Period of conditioning 9
6. Procedures for atmospheric preconditioning, conditioning and testing
11 7. Liquid immersion, conditioning and testing
8. Standard reference atmosphere
9. Code for specifying preconditioning, conditioning and testing
TABLES 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
STANDARD CONDITIONS
FOR USE PRIOR TO AND DURING THE TESTING
OF SOLID ELECTRICAL INSULATING MATERIALS
FOREWORD
The formal decisions or agreements of the I E C on technical matters, prepared by Technical Committees on which all the
1)
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use and they are accepted by the National Committees in that
2)
sense.
In order to promote this international unification, the I E C expresses the wish that all National Committees having as
3)
yet no national rules, when preparing such rules, should use the I E C recommendations as the fundamental basis for these
rules in so far as national conditions will permit.
The desirability is recognized of extending international agreement on these matters through an endeavour to harmonize
4)
national standardization rules with these recommendations in so far as national conditions will permit. The National
Committees pledge their influence towards that end.
PREFACE
This Recommendation was prepared by Sub-Committee 15A, Short-time Tests, of I E C Technical Committee No. 15,
Insulating Materials.
It contains the first edition issued in 1966 with revised Tables I, II and III.
A first draft of the first edition was discussed at meetings held in New Delhi in 1960 and in Venice in 1963. As a result
of this latter meeting, a new draft was prepared and submitted to the National Committees for approval under the Six Months'
Rule in October 1963.
The following countries voted explicitly in favour of publication:
Austria Italy
Japan
Belgium
Canada Korea (Republic of)
Netherlands
China (People's Republic of)
Czechoslovakia Norway
Denmark Poland
Romania
Finland
France Sweden
Germany Switzerland
Union of Soviet Socialist Republics
Hungary
India United Kingdom
United States of America
Israel
Drafts for the revision of the tables were discussed during the meeting held in London in 1968. As a result of this meeting,
a draft was submitted to the National Committees for approval under the Six Months' Rule in May 1969. Amendments
were submitted to the National Committees for approval under the Two Months' Procedure in October 1970.
The following countries voted explicitly in favour of publication:
Italy
Australia
Netherlands
Belgium
Canada South Africa
Sweden
Czechoslovakia
Denmark Switzerland
Finland Turkey
Union of Soviet Socialist Republics
France
Germany United Kingdom
Hungary United States of America
Yugoslavia
Iran
— 7 —
STANDARD CONDITIONS
FOR USE PRIOR TO AND DURING THE TESTING
OF SOLID ELECTRICAL INSULATING MATERIALS
1. General
Certain properties of many materials are affected by the temperature or humidity, or both, of the
atmospheres to which they are subjected. It is usually necessary, therefore, when testing electrical
insulating materials, to control the ambient conditions, e.g., of temperature and humidity to which
the specimens are subjected prior to test and the ambient conditions in which the specimens are
actually tested.
When giving results of tests on electrical insulating materials likely to be affected by those factors,
it is important that the relevant conditions to which the test specimens were exposed are quoted.
Specifications for such materials should, therefore, specify the atmospheres to which the test specimens
should be exposed before testing and the conditions under which the tests are to be made.
2. Scope
This Recommendation gives standard conditions of exposure time, temperature, atmospheric
humidity and liquid immersion for use in testing electrical insulating materials. The range is sufficiently
wide to enable suitable conditions to be selected so that either of the primary objects of conditioning
can be achieved. These objects are:
a) To obtain greater reproducibility of test results by:
i) partly counteracting the variations of the properties of the material due to the past history
of the test specimens (often known as " normalizing ", here called preconditioning), and
ii) ensuring uniformity of conditions during the testing.
b) To determine the influence of exposure to ce rtain temperatures and humidities, or immersions in
liquids, on the properties of a material by subjecting specimens to specified conditions before or
during the test or both.
3. Definitions
For the purpose of this Recommendation, the following definitions of certain terms apply:
a) Preconditioning
The treatment of a specimen with the object of removing or partly counteracting the effect
of its previous history with respect, principally, to the temperature and humidity to which it has
been exposed. This treatment (sometimes known as " normalizing ") usually precedes condition-
ing of a specimen.
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Conditioning (of a specimen)
b)
The subjection of the specimen to an atmosphere of a specified relative humidity or complete
immersion in water or other liquid, at a specified temperature for a specified period of time.
When the combination of temperature and humidity for conditioning is the same as that prescribed for
Note. —
preconditioning, the preconditioning and conditioning may be merged and the preconditioning may be
-
said to take the place of conditioning.
The test conditions
c)
The temperature and humidity of the atmosphere surrounding the specimen, or temperature
and kind of liquid (for liquid immersion), at the time tests are carried out.
d) Standard reference atmosphere
The atmosphere to which values measured under any other atmospheric conditions are
corrected by calculation.
e) Relative humidity
The ratio of the actual vapour pressure to the saturation vapour pressure at the same (dry
bulb) temperature, expressed as a percentage.
Temperature and humidity (or liquid immersion) recommended for preconditioning, conditioning and
4.
testing
The recommended standard conditions of temperature and humidity (or liquid immersion) for
preconditioning, conditioning and testing are given in Tables I and II, pages 15 and 17.
When preconditioning is required, one of the standard atmospheres or one of the dry-hot conditions
given in Table I may be
...