Specifications for unused silicone insulating liquids for electrotechnical purposes

IEC 60836:2015 covers specifications and test methods for unused silicone liquids intended for use in transformers and other electrotechnical equipment. Besides the standard transformer applications there are other applications of silicone liquids, such like cable accessories, capacitors, electrical magnets etc. This edition includes the following major technical changes with regard to the second edition:
a) classification of liquids according to IEC 61039 have been adapted with respect to the latest edition of IEC 61039:2008;
b) classification of liquids according to IEC 61100:1992 have been removed as IEC 61100 has been withdrawn;
c) minimum requirements for other silicone liquids for electrotechnical purposes have been added.

Spécifications pour liquides isolants silicones neufs pour usages électrotechniques

IEC 60836:2015 couvre les spécifications et les méthodes d essai pour les liquides silicones neufs destinés à être utilisés dans les transformateurs et tout autre appareil électrotechnique. Outre les applications normalisées dans les transformateurs, il existe d autres applications pour les liquides silicones, telles que les accessoires de câble, les condensateurs, les électro-aimants, etc. Cette édition inclut les modifications techniques majeures suivantes par rapport à l édition précédente:
a) la classification des liquides selon l'IEC 61039 a été adaptée par rapport à la dernière édition de l'IEC 61039:2008;
b) la classification des liquides selon l'IEC 61100:1992 a été éliminée du fait de la suppression de ladite IEC 61100;
c) les exigences minimales relatives aux autres liquides silicones pour usages électrotechniques ont été ajoutées.

General Information

Status
Published
Publication Date
15-Jul-2015
Current Stage
PPUB - Publication issued
Start Date
16-Jul-2015
Completion Date
16-Jul-2015
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IEC 60836
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Specifications for unused silicone insulating liquids for electrotechnical
purposes
Spécifications pour liquides isolants silicones neufs pour usages
électrotechniques
IEC 60836:2015-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60836
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Specifications for unused silicone insulating liquids for electrotechnical
purposes
Spécifications pour liquides isolants silicones neufs pour usages
électrotechniques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-2789-3

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 60836:2015 © IEC 2015
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 6

4 Properties ........................................................................................................................ 6

4.1 General properties .................................................................................................. 6

4.2 Properties relating to health, safety and environment (HSE) ................................... 7

4.2.1 Handling .......................................................................................................... 7

4.2.2 Disposal .......................................................................................................... 7

5 General delivery requirements and identification.............................................................. 7

6 Storage and maintenance ................................................................................................ 7

7 Sampling ......................................................................................................................... 7

8 Properties and test methods ............................................................................................ 8

8.1 Colour and appearance ........................................................................................... 8

8.1.1 Colour ............................................................................................................. 8

8.1.2 Appearance ..................................................................................................... 8

8.2 Density ................................................................................................................... 8

8.3 Kinematic viscosity ................................................................................................. 8

8.4 Flash point .............................................................................................................. 8

8.5 Fire point ................................................................................................................ 8

8.6 Refractive index ...................................................................................................... 8

8.7 Pour-point ............................................................................................................... 8

8.8 Water content ......................................................................................................... 8

8.9 Acidity ..................................................................................................................... 8

8.10 Breakdown voltage ................................................................................................. 8

8.11 Dielectric dissipation factor, permittivity, d.c. resistivity ........................................... 8

8.12 Gassing under electrical stress and ionization ........................................................ 8

8.13 Flammability ........................................................................................................... 9

9 Individual specifications ................................................................................................... 9

9.1 General ................................................................................................................... 9

9.2 Silicone transformer liquid ....................................................................................... 9

9.3 Other silicone liquids for electrotechnical purposes ............................................... 10

Bibliography .......................................................................................................................... 11

Table 1 – Specification of silicone transformer liquid ............................................................... 9

Table 2 – Minimum requirements for silicone liquids ............................................................. 10

---------------------- Page: 4 ----------------------
IEC 60836 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATIONS FOR UNUSED SILICONE INSULATING
LIQUIDS FOR ELECTROTECHNICAL PURPOSES
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC 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, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

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 International Standard IEC 60836 has been prepared by IEC technical committee 10:

Fluids for electrotechnical applications.

This third edition cancels and replaces the second edition published in 2005. This edition

constitutes a technical revision.

This edition includes the following major technical changes with regard to the second edition:

a) classification of liquids according to IEC 61039 have been adapted with respect to the

latest edition of IEC 61039:2008;

b) classification of liquids according to IEC 61100:1992 have been removed as IEC 61100

has been withdrawn;

c) minimum requirements for other silicone liquids for electrotechnical purposes have been

added.
---------------------- Page: 5 ----------------------
– 4 – IEC 60836:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
10/961FDIS 10/968/RVD

Full information on the voting for the approval of this standard 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.

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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60836 © IEC 2015 – 5 –
SPECIFICATIONS FOR UNUSED SILICONE INSULATING
LIQUIDS FOR ELECTROTECHNICAL PURPOSES
1 Scope

This International Standard covers specifications and test methods for unused silicone liquids

intended for use in transformers and other electrotechnical equipment.

The specified characteristics of silicone transformer liquid classified as L-NTUK-8360300 (in

accordance with IEC 61039) are described in Table 1.

Besides the standard transformer applications there are other applications of silicone liquids,

such like cable accessories, capacitors, electrical magnets etc. The specified characteristics

and minimum requirements for these liquids are described in Table 2.

NOTE Maintenance of used silicone liquid in electrotechnical equipment is covered in a separate publication

IEC 60944.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60156:1995, Insulating liquids – Determination of the breakdown voltage at power

frequency – Test method

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

factor (tan δ) and d.c. resistivity

IEC 60296, Fluids for electrotechnical applications – Unused mineral insulating oils for

transformers and switchgear
IEC 60475, Method of sampling insulating liquids
IEC 60628, Gassing of insulating liquids under electrical stress and ionization

IEC 60814, Insulating liquids – Oil-impregnated paper and pressboard – Determination of

water by automatic coulometric Karl Fischer titration
IEC 60944, Guide for the maintenance of silicone transformer liquids
IEC 61039:2008, Classification of insulating liquids

IEC 62021-3, Insulating liquids – Determination of acidity – Part 3: Test methods for non-

mineral insulating oils

ISO 2211, Liquid chemical products – Measurement of colour in Hazen units (platinum-cobalt

scale)
ISO 2592, Determination of flash and fire points – Cleveland open cup method
---------------------- Page: 7 ----------------------
– 6 – IEC 60836:2015 © IEC 2015
ISO 2719, Determination of flash point – Pensky Martens closed cup method
ISO 3016, Petroleum products – Determination of pour point

ISO 3104, Petroleum products – Transparent and opaque liquids – Determination of kinematic

viscosity and calculation of dynamic viscosity

ISO 3675, Crude petroleum and liquid petroleum products – Laboratory determination of

density – Hydrometer method

ISO 5661, Petroleum products – Hydrocarbon liquids – Determination of refractive index

ISO 12185, Crude petroleum and petroleum products – Determination of density – Oscillating

U-tube method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
silicone insulating liquids

liquid organopolysiloxanes whose molecular structure consists mainly of linear chains of

alternating silicon and oxygen atoms, with hydrocarbon groups attached to the silicon atoms

3.2
silicone transformer liquid
polydimethyl siloxane, without additives, primarily for use in transformers

Note 1 to entry: According to IEC 61039, this type is classified as L-NTUK-8360300.

3.3
other silicone liquids for electrotechnical purposes
polydimethyl siloxane, without additives, applied for electrotechnical purposes

Note 1 to entry: Classification of other fluids for electrotechnical purposes according to IEC 61039 shall be made

in relation to their main application and their fire point, e.g. a liquid for capacitors with a fire point of less than

300 °C is classified as L-NCUO-8360300.
4 Properties
4.1 General properties

As defined in 3.2, silicone liquid for transformers has high flash and fire points and is

therefore difficult to ignite. If combustion occurs, heat release rate is much lower than that of

hydrocarbon oils.

In addition to use at similar working temperatures to those of transformers containing mineral

transformer oil, silicone insulating liquids may also be used in appropriately designed

electrotechnical equipment operating at higher temperatures.

The solubility of water in silicone liquids is greater than in mineral oils. Other physical

characteristics which are important for the design of electrotechnical equipment, e.g. heat

transfer, may also be different from those of mineral transformer oil and will need to be taken

fully into account by the designer.
---------------------- Page: 8 ----------------------
IEC 60836 © IEC 2015 – 7 –
4.2 Properties relating to health, safety and environment (HSE)
4.2.1 Handling

Silicone liquids ultimately degrade in nature to simple, naturally occurring substances. Their

handling is not hazardous to health.

Direct contact with the eyes may cause slight irritation. Safety glasses should be worn to

avoid splashing the eyes. In the case of eye contact, irrigation with large quantities of clean

running water should relieve any irritation. If irritation persists, seek medical advice.

Detailed information on safe handling of these liquids can be obtained from manufacturers or

suppliers.
4.2.2 Disposal

Local regulations shall be complied with. The preferred means of disposal is recycling by a

qualified contractor. Waste liquid may be incinerated. Spillages should be cleaned using

adsorbent media. Small quantities of liquid entering the environment present no special

hazard.
5 General delivery requirements and identification

Transport of silicone insulating liquid shall be in clean hermetically sealed containers whose

lining does not interact with the contents.
Each container shall display the following information:
– number of this standard;
– supplier’s designation;
– batch number;
– any notices required by local regulatory authorities.

Electrotechnical equipment filled with silicone insulating liquid should be labelled for

identification with respect to the insulation used.
6 Storage and maintenance

Storage should preferably be indoors and shall be in sealed containers to prevent ingress of

moisture and dirt. If accidentally contaminated by water and/or solid particles during storage,

the liquid can usually be restored to acceptable quality by the procedures described in

IEC 60944.
7 Sampling

The liquid shall be sampled in accordance with IEC 60475, using the procedure consistent

with the density of the liquid being sampled. Isopropyl alcohol is suitable for cleaning the

sampling equipment.
---------------------- Page: 9 ----------------------
– 8 – IEC 60836:2015 © IEC 2015
8 Properties and test methods
8.1 Colour and appearance
8.1.1 Colour
This property shall be measured according to ISO 2211.
8.1.2 Appearance

This property shall be evaluated by examining a representative sample of approximately

100 mm in thickness, in transmitted light and at ambient temperature.
8.2 Density

This property shall be measured at 20 °C according to ISO 3675 but measurement according

to ISO 12185 is accepted as well.
8.3 Kinematic viscosity
This property shall be measured at 40 °C according to ISO 3104.
8.4 Flash point
This property shall be measured according to ISO 2719.
8.5 Fire point
This property shall be measured according to ISO 2592.
8.6 Refractive index
This property shall be measured according to ISO 5661.
8.7 Pour-point
This property shall be measured according to ISO 3016.
8.8 Water content
This property shall be measured according to IEC 60814.
8.9 Acidity
This property shall be measured according to IEC 62021-3.
8.10 Breakdown voltage

This property shall be measured according to IEC 60156 and with particular attention to

IEC 60156:1995, 3.4.2.
8.11 Dielectric dissipation factor, permittivity, d.c. resistivity

These properties shall be determined at 90 °C by the methods described in IEC 60247.

Isopropyl alcohol or acetone are suitable for cleaning the test cell.
8.12 Gassing under electrical stress and ionization
This property shall be measured according to IEC 60628.
---------------------- Page: 10 ----------------------
IEC 60836 © IEC 2015 – 9 –
8.13 Flammability

Fire hazard measurement of insulating liquids is now studied by IEC technical committee 89.

9 Individual specifications
9.1 General

The specifications given in Table 1 and Table 2 applies only to unused silicone liquids

intended for use in electrotechnical equipment, as received from the supplier and before any

treatment or introduction into electrotechnical equipment. The liquid sampled in accordance

with Clause 7 shall be tested in accordance with the appropriate test methods given in

Clause 8. The characteristics of the liquid when tested shall comply with the requirements

given in Table 1 and Table 2.
9.2 Silicone transformer liquid

This liquid is polydimethyl siloxane without additives, primarily for use in transformers.

According to IEC 61039, it is classified as L-NTUK-8360300.

When tested in accordance with the methods specified in Clause 8, the properties of silicone

transformer liquid shall meet the requirements given in Table 1.
Table 1 – Specification of silicone transformer liquid
Property Test method Permissible values Notes
(clause or
subclause)
Colour 8.1.1 Max.35
Appearance 8.1.2 Clear, free from suspended
matter and sediment
Density at 20 °C (kg/dm ) 8.2 0,955 to 0,970
Kinematic viscosity at 40 °C (mm /s) 8.3
40 ± 4
Flash point (°C) 8.4 Min. 240
Fire point (°C) 8.5 Min. 340
Refractive index at 20 °C 8.6 1,404 ± 0,002
Pour point (°C) 8.7 Max. –50
Water content (mg/kg) 8.8 Max. 50 see
NOTE
Acidity (mg KOH/g) 8.9 Max. 0,01 see
NOTE
Breakdown voltage (kV) 8.10 Min. 40 see
NOTE
Dielectric dissipation factor (DDF) at 90 °C and 50 Hz 8.11 Max. 0,001 see
NOTE
Permittivity at 90 °C 8.11 see
2,55 ± 0,05
NOTE
8.11 Min. 100 see
DC resistivity at 90 °C (GΩ × m)
NOTE
NOTE For untreated liquid, as received.
---------------------- Page: 11 ----------------------
– 10 – IEC 60836:2015 © IEC 2015
9.3 Other silicone liquids for electrotechnical purposes

Other silicone liquids are available and may be used for electrotechnical purposes. These

liquids are polydimethyl siloxanes without additives and may have either a higher or a lower

viscosity than liquids as per 9.2.

When tested in accordance with the methods specified in Clause 8, the properties of these

liquids shall meet the minimum requirements given in Table 2.
Table 2 – Minimum requirements for silicone liquids
Property Test Permissible values Notes
method
(clause or
subclause)
As a function of the target
Fire point (°C) 8.5 classification according to
IEC 61039
Pour point (°C) 8.7 < –50
Water content (mg/kg) 8.8 Max. 50 see NOTE
Acidity (mg KOH/g) 8.9 Max. 0,01 see NOTE
Breakdown voltage (kV) 8.10 Min. 40 see NOTE
Dielectric dissipation factor (DDF) at 90 °C and 50 Hz 8.11 Max. 0,001 see NOTE
DC resistivity at 90 °C (GΩ × m) 8.11 Min. 100 see NOTE
NOTE For untreated liquid, as received.

The minimum value of the fire point shall be selected as a function of the target classification according to

IEC 61039. If classification "class K" is required the fire point shall be above 300 °C; fluids with a fire point of

less than or equal to 300 °C shall be classified "class O"; silicone liquids with a lower viscosity exhibit a lower

fire point; selection shall be made with respect to local standards and minimum requirements for the intended

application of the liquid; the minimum flash point of the chosen liquid shall be in accordance with IEC 60296.

---------------------- Page: 12 ----------------------
IEC 60836 © IEC 2015 – 11 –
Bibliography

IEC 60076-14, Power transformers – Part 14: Liquid-immersed power transformers using

high-temperature insulation materials

IEC 60695-1-40, Fire hazard testing – Part 1-40: Guidance for assessing the fire hazard of

electrotechnical products – Insulating liquids

IEC TS 60695-8-3, Fire hazard testing – Part 8-3: Heat release – Heat release of insulating

liquids used in electrotechnical products
___________
---------------------- Page: 13 ----------------------
– 12 – IEC 60836:2015 © IEC 2015
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 13

1 Domaine d’application ................................................................................................... 15

2 Références normatives .................................................................................................. 15

3 Termes et définitions ..................................................................................................... 16

4 Propriétés ...................................................................................................................... 16

4.1 Propriétés générales ............................................................................................. 16

4.2 Propriétés relatives à l’hygiène, à la sécurité et à l'environnement (HSE) ............. 17

4.2.1 Manipulation .................................................................................................. 17

4.2.2 Mise au rebut ................................................................................................. 17

5 Exigences générales de livraison et identification .......................................................... 17

6 Stockage et maintenance .............................................................................................. 17

7 Échantillonnage ....................................................................................

...

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