Electrical insulation systems (EIS) - Thermal evaluation of combined liquid and solid components - Part 3: Hermetic motor-compressors

IEC TS 62332-3:2016 is applicable to EIM and EIS containing solid and liquid components where the refrigerant, oil and thermal stresses are the dominant ageing factor, without restriction to voltage class.

Systèmes d'isolation électrique (SIE) - Évaluation thermique de composants liquides et solides combinés - Partie 3: Motocompresseurs hermétiques

L'IEC TS 62332-3:2016 est applicable aux MIE et aux SIE contenant des composants solides et liquides, et pour lesquels le fluide frigorigène, l'huile et les contraintes thermiques constituent les facteurs de vieillissement prédominants, indépendamment de la classe de tension.

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Status
Published
Publication Date
20-Jul-2016
Current Stage
PPUB - Publication issued
Completion Date
21-Jul-2016
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IEC TS 62332-3
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Electrical insulation systems (EIS) – Thermal evaluation of combined liquid and
solid components –
Part 3: Hermetic motor-compressors
Systèmes d'isolation électrique (SIE) – Évaluation thermique de composants
liquides et solides combinés –
Partie 3: Motocompresseurs hermétiques
IEC TS 62332-3:2016-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 62332-3
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Electrical insulation systems (EIS) – Thermal evaluation of combined liquid and
solid components –
Part 3: Hermetic motor-compressors
Systèmes d'isolation électrique (SIE) – Évaluation thermique de composants
liquides et solides combinés –
Partie 3: Motocompresseurs hermétiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.30 ISBN 978-2-8322-3527-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC TS 62332-3:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 6

1 Scope ............................................................................................................................ 7

2 Normative references..................................................................................................... 7

3 Terms and definitions .................................................................................................... 8

4 Electrical insulation material (EIM) evaluation ................................................................ 9

4.1 General description ............................................................................................... 9

4.2 Test equipment ..................................................................................................... 9

4.2.1 Autoclave ....................................................................................................... 9

4.2.2 Ageing oven ................................................................................................. 10

4.3 Specimen ............................................................................................................ 10

4.3.1 General ....................................................................................................... 10

4.3.2 Determination of component shape, volume or weight of EIM ........................ 10

4.3.3 Reference test subject ................................................................................. 12

4.4 Test procedures .................................................................................................. 12

4.4.1 General test procedure ................................................................................. 12

4.4.2 Preparation of the autoclave ......................................................................... 12

4.4.3 Ageing ......................................................................................................... 13

4.4.4 Opening procedure ...................................................................................... 13

4.5 Diagnostic test .................................................................................................... 13

4.5.1 General ....................................................................................................... 13

4.5.2 Solid insulation materials ............................................................................. 13

4.5.3 Liquid insulation material (refrigerant oil) ...................................................... 14

4.6 Analysis of data .................................................................................................. 15

4.6.1 End-point criteria ......................................................................................... 15

4.6.2 End-of-life of the oil and solid component ..................................................... 15

4.6.3 Extrapolation of data .................................................................................... 15

5 Electrical insulation system (EIS) evaluation ................................................................ 15

5.1 General description ............................................................................................. 15

5.2 Test equipment ................................................................................................... 15

5.2.1 Autoclave ..................................................................................................... 15

5.2.2 Ageing oven ................................................................................................. 16

5.2.3 Specimen mounting tool ............................................................................... 16

5.3 Specimen ............................................................................................................ 16

5.4 Test procedure .................................................................................................... 16

5.4.1 Initial screening test ..................................................................................... 16

5.4.2 Preparation of the autoclave ......................................................................... 17

5.4.3 Thermal endurance test................................................................................ 17

5.5 End of life criterion .............................................................................................. 17

5.6 Analysis of data .................................................................................................. 17

6 Report ......................................................................................................................... 17

Annex A (informative) End-point and criteria examples of thermal life ................................ 19

Annex B (informative) Suggested test procedures ............................................................... 20

B.1 Test procedures for effect to the electric resistance of oil and refrigerant .............. 20

B.1.1 General ....................................................................................................... 20

B.1.2 Autoclave ..................................................................................................... 20

---------------------- Page: 4 ----------------------
IEC TS 62332-3:2016 © IEC 2016 – 3 –

B.1.3 Test subject ................................................................................................. 20

B.1.4 Test process ................................................................................................ 20

B.2 Blister test of winding wire ................................................................................... 20

B.2.1 Overview ..................................................................................................... 20

B.2.2 General ....................................................................................................... 20

B.2.3 Autoclave ..................................................................................................... 20

B.2.4 Test subject ................................................................................................. 21

B.2.5 Test process ................................................................................................ 21

B.2.6 Test result ................................................................................................... 21

B.3 Refrigerant extract test for solid insulating materials ............................................ 21

B.3.1 General ....................................................................................................... 21

B.3.2 Autoclave ..................................................................................................... 21

B.3.3 Test subject ................................................................................................. 21

B.3.4 Test process ................................................................................................ 22

B.3.5 Test result ................................................................................................... 22

B.4 Metal surface contamination test ......................................................................... 22

B.4.1 General ....................................................................................................... 22

B.4.2 Test procedure ............................................................................................. 22

Bibliography ....................................................................................................................... 23

Figure 1 – Autoclave example for ageing test of EIM ............................................................. 9

Figure 2 – Examples of the autoclave for EIS ageing ........................................................... 16

Figure 3 – Mounting tool ..................................................................................................... 16

Figure 4 – Example of GPM mounting ................................................................................. 16

Table 1 – Hermetic motor-compressor EIM and diagnostic test items ................................... 10

Table 2 – Diagnostic test and its method for solid insulation ................................................ 14

Table 3 – Diagnostic test and its method for liquid insulation ............................................... 14

Table A.1 – End-point and criteria example of thermal life .................................................... 19

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– 4 – IEC TS 62332-3:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS (EIS) –
THERMAL EVALUATION OF COMBINED LIQUID
AND SOLID COMPONENTS –
Part 3: Hermetic motor-compressors
FOREWORD

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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a Technical

Specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 62332-3, which is a Technical Specification, has been prepared by IEC technical

committee 112: Evaluation and qualification of electrical insulating materials and systems.

---------------------- Page: 6 ----------------------
IEC TS 62332-3:2016 © IEC 2016 – 5 –
The text of this Technical Specification is based on the following documents:
Enquiry draft Report on voting
112/353/DTS 112/362/RVC

Full information on the voting for the approval of this Technical Specification can be found in

the report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62332 series, published under the general title Electrical insulation

systems (EIS) – Thermal evaluation of combined liquid and solid components, can be found

on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• transformed into an International Standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC TS 62332-3:2016 © IEC 2016
INTRODUCTION

This part of IEC 62332, which is a Technical Specification, describes a method for the thermal

evaluation of electrical insulation systems (EIS) for electrotechnical products with combined

liquid and solid components. IEC TS 62332-1 covers general test requirements.

IEC TS 62332-2 covers a simplified test method which can be used as a screening test prior

to conducting IEC TS 62332-1 testing or can be used as a quality control test to evaluate

minor product changes. This part of IEC 62332 covers the evaluation and qualification of

electrical insulation materials (EIM) and EIS which are applied to motor-compressors for the

refrigerator or air conditioner. This document contains the evaluation items which are

important to maintain the equipment performances in the refrigerator oil and refrigerant at

high temperature and high pressure.
This document has been prepared in conjunction with IEC 60335-2-34.

IEC TS 62332-3 is applicable to EIM and EIS evaluation for hermetic motor-compressors

which are applied to the refrigerator and the air conditioner. The main procedures consist in

the evaluation of EIM and EIS endurance for refigerator and oil at high temperature and high

pressure. It describes how to evaluate the mechanical, thermal and chemical degradation of

the performances of EIM which have deep relation to keep the sound condition of the

equipment.

This simplified Technical Specification provides a test method for sealed tube testing. The

sealed tube should contain all the primary EIM elements in relative component ratios which

compare with the actual electrotechnical device.
---------------------- Page: 8 ----------------------
IEC TS 62332-3:2016 © IEC 2016 – 7 –
ELECTRICAL INSULATION SYSTEMS (EIS) –
THERMAL EVALUATION OF COMBINED LIQUID
AND SOLID COMPONENTS –
Part 3: Hermetic motor-compressors
1 Scope

This part of IEC 62332, which is a Technical Specification, is applicable to EIM and EIS

containing solid and liquid components where the refrigerant, oil and thermal stresses are the

dominant ageing factor, without restriction to voltage class.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60216-1, Electrical insulating materials – Thermal endurance properties – Part 1: Ageing

procedures and evaluation of test results

IEC 60216-3, Electrical insulating materials – Thermal endurance properties – Part 3:

Instructions for calculating thermal endurance characteristics

IEC 60216-4-1:2006, Electrical insulating materials – Thermal endurance properties – Part 4-1:

Ageing ovens – Single-chamber ovens

IEC 60216-5, Electrical insulating materials – Thermal endurance properties – Part 5:

Determination of relative thermal endurance index (RTE) of an insulating material

IEC 60247, Insulating liquids – Measurement of relative permittivity, dielectric dissipation

factor (tan δ) and d.c. resistivity

IEC 60250, Recommended methods for the determination of the permittivity and dielectric

dissipation factor of electrical insulating materials at power, audio and radio frequencies

including metre wavelengths

IEC 60317-0-1, Specifications for particular types of winding wires – Part 0-1: General

requirements – Enamelled round copper wire
IEC 60505, Evaluation and qualification of electrical insulation systems

IEC 60674-2, Specification for plastic films for electrical purposes. Part 2: Methods of test

IEC 60684-2, Flexible insulating sleeving – Part 2: Methods of test
IEC 60851-5, Winding wires – Test methods – Part 5: Electrical properties

IEC 61857-1:2008, Electrical insulation systems– Procedures for thermal evaluation – Part 1:

General requirements – Low voltage
---------------------- Page: 9 ----------------------
– 8 – IEC TS 62332-3:2016 © IEC 2016

IEC 61857-21:2009, Electrical insulation systems – Procedures for thermal evaluation –

Part 21: Specific requirements for general-purpose models – Wire-wound applications

IEC 62021 (all parts), Insulating liquids – Determination of acidity
ISO 178, Plastics – Determination of flexural properties

ASTM D4603, Standard Test Method for Determining Inherent Viscosity of Poly(Ethylene

Terephthalate) (PET) by Glass Capillary Viscometer
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60505, as well as

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
acidity

quantity of base, expressed in milligrams of potassium hydroxide per gram of sample,

required to titrate potentiometrically or colourimetrically a test portion in a specified solvent to

the end point
[SOURCE: IEC 62021-3: 2014, 3.1]
3.2
breakdown voltage

voltage at which a specimen suffers destructive discharges under the prescribed test

conditions
Note 1 to entry: It is used in tests with continuously rising voltage.
3.3
extract
substance or resource obtained from a given element by a special method
3.4
thermal ageing factor
thermal stress that causes irreversible changes in the EIS
3.5
interfacial tension

adhesive forces between the liquid phase of one substance and either a solid, liquid or gas

phase of another substance
3.6
autoclave
sealed tube

sealed container partially filled with the liquid EIM and which includes the solid EIM in relative

component ratios which compare with the actual electrotechnical device
---------------------- Page: 10 ----------------------
IEC TS 62332-3:2016 © IEC 2016 – 9 –
3.7
blister
small foam which is produced in the inner enamel layer of a winding wire
4 Electrical insulation material (EIM) evaluation
4.1 General description

This test procedure is useful for evaluating the chemical compatibility of insulation material

(EIM) with the liquid (oil) and refrigerant at high temperature and high pressure.

The reference and candidate EIM shall be exposed to test periods at selected elevated

temperatures and pressures. These test periods consist of a specific time exposure at the

selected temperature and pressure followed by diagnostic tests.

A specific material is sealed in a stainless steel autoclave, subjected to a specified thermal

ageing cycle and then subjected to each test. Candidate autoclave test results are then

compared to the reference autoclave test results for qualification of the acceptability of the

candidate EIM.
The test system consists of the following elements:
• autoclaves;
• ageing ovens;
• test objects.
4.2 Test equipment
4.2.1 Autoclave

Each autoclave is a container constructed of stainless steel. The size or the volume shall be

determined by the size or the volume of the test objects, oil and refrigerant, excluding the

3 3

electric resistance test and extract test. In general, 300 cm to 500 cm volume of autoclave

is convenient and enough for each EIM test.

Either one or both ends of the cell shall be fitted with removable, sealable bolt-on covers.

The autoclave parts shall be provided for the pressure gage, pressure relief system, needle

valve and gas sealing packing.
For specific details, see Figure 1.
IEC
Figure 1 – Autoclave example for ageing test of EIM
---------------------- Page: 11 ----------------------
– 10 – IEC TS 62332-3:2016 © IEC 2016
4.2.2 Ageing oven
An air circulating oven or oil bath can be used.

In case of an air circulating oven, the ovens used shall meet the requirements of

IEC 60216-4-1:2006, 5.2 to 5.4 (temperature difference, fluctuation on variation).

In case of an oil bath, the oil level shall be maintained at a level high enough to provide

appropriate heat transfer during the test. The oil shall have enough thermal endurance for the

ageing test in this case.
4.3 Specimen
4.3.1 General

The following EIMs and components are applied as test subjects and evaluated by each

diagnostic test as shown in Table 1.
Table 1 – Hermetic moto
...

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