IEC 60836 pdf download

IEC 60836 pdf download Specifications for unused silicone insulating liquids for electrotechnical purposes
1 scope
This International Standard covers specifications and test methods for unused silicone liquidintended for use in transformers and other electrotechnical equipment.
The specified characteristics of silicone transformer liquid Type 1 are described in Table 1.Other ‘specifications will be added when required.
NOTE Maintenance of used silicone liquid in electrotechnical equipment is covered in a separate publicationEC 60944.
2 Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60156,Insulating liquids – Determination of the breakdown voltage at power frequency -Test method
IEC 60247，Insulating liquids – Measurement of relative permittivity，dielectric dissipationfactor (tan 8)) and d.c. resistivity
IEC 60475,Method of sampling liquid dielectrics
IEC 60628,Gassing of insulating liquids under electrical stress and ionization
IEC 60814,Insulating liquids – Oil-impregnated paper and pressboard – Determination ofwater by automatic coulometric Karl Fischer titration
IEC 60944,Guide for the maintenance of silicone transformer liquids
ISO 2211,Liquid chemical products – Measurement of colour in Hazen units (platinum-cobaltscale)
ISO 2592,Determination of flash and fire points – Cleveland open cup methodISO 2719,Determination of of flash point – Pensky Martens closed cup method
Iso 3016,Petroleum products – Determination of pour point (available in English only)
!sO 3104，Petroleum products – Transparent and opaque liquids – Determination ofkinematic viscosity and calculation of dynamic viscosity
ISO 3675，Crude petroleum and liquid petroleum products – Laboratory determination ofdensity – Hydrometer method
ISO 5661,Petroleum products – Hydrocarbon liquids – Determination of refractive index
3Terms 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 ofalternating silicon and oxygen atoms,with hydrocarbon groups attached to the silicon atoms
3.2
silicone transformer liquid Type T1
polydimethyl siloxane, without additives,primarily for use in transformers
NOTE 1 When tested in accordance with the methods specified in Clause 8, silicone Type T1 transformer liquidshould comply with the requirements given in Table 1 of this standard.
NOTE 2 According to lEC 61039，silicone Type T1 is classified as L-60836-1 and according to lIEC 61100 asClass K3.
4Properties
4.1General properties
Silicone liquid for transformers (Type T1) has high flash and fire points and is thereforedifficult to ignite. lf combustion occurs，heat release rate is much lower than that ofhydrocarbon oils.
ln addition to use at similar working temperatures to those of transformers containing mineraltransformer oil,silicone insulating liquid (Type T1) may also be used in appropriatelydesigned electrotechnical equipment operating at higher temperatures.
The solubility of water in silicone liquids is greater than in mineral oils. Other physicalcharacteristics which are important for the design of electrotechnical equipment，e.g heattransfer,may also be different from those of mineral transformer oil and will need to be takenfully into account by the designer.
4.2Properties relating to health,safety and environment (HSE)