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Shell Diala Oil B

Electrical insulating oil

Shell Diala B is a non-inhibited insulating oil manufactured from naphthenic feedstocks. It offers good dielectric properties, good oxidation stability and provides efficient heat transfer. It has excellent low temperature properties achieved without the use of pour point depressants.

As a customer service, Shell Diala B can also be supplied in “dried” form.

Applications

Industrial transformers
Electrical insulating oil for transformers and

switch-gears.

Grid and Industrial transformers up to maximum load.

Electrical equipment
Components like rectifiers, circuit breakers,

switch-gears.

Advice on applications not covered in this leaflet may be obtained from your Shell Representative.

Performance Features and Advantages

Good oxidation stability
Diala B is offers inherent natural resistance to oil

degradation.

Good dielectric strength
It exceeds the requirements from all major

specifications.

Very good low temperature properties
The naphthenic nature of the feedstock of Diala  B

provides a good low temperature performance without adding any additives.

Good heat transfer characteristics
The good low temperature properties of the oil

ensures proper heat transfer inside the transformer even from lowest starting temperatures.

Specification and Approvals

Shell Diala B meets the following specifications: IEC 296 (1982)  Class I

IEC 60296 (2003)

Table 2 Transformer Oil(Uninhibited)

Storage precautions

The critical electrical properties of Shell Diala B are easily compromised by trace contamination with foreign material. Typically encountered contaminants include moisture, particles, fibers and surfactants.  Therefore, it is imperative that electrical insulating oils be kept clean and dry.

It is strongly recommended that storage

containers be dedicated for electrical service and include air-tight seals.  It is further recommended that electrical insulating oils be stored indoors in climate-controlled  environments.

Health and Safety

Guidance on Health and Safety are available on the appropriate Material Safety Data Sheet which can be obtained from your Shell representative.

Shell Diala B is free of polychlorinated  biphenyls

(PCB).

Protect the environment

Take used oil to an authorized collection point.  Do not discharge into drains, soil or water.

Typical Characteristics

  Specification requirements Diala B Diala B dried
Property Units Method
IEC 296

Class 1

IEC 60296
Appearance   IEC 296 Clear, free of solids Complies
Density at 20ºC Kg/m3 ISO 3675 Kinematic viscosity at

۴۰ºC

mm2/s ISO 3104 ۱۶٫۵ max ۱۲ max ۱۱٫۶
Kinematic viscosity at

-۱۵ºC

mm2/s   ۸۰۰ max – ۳۴۰
Kinematic viscosity at

-۳۰ºC

mm2/s ISO 3104   ۱۸۰۰ max ۱۷۹۰
Flashpoint P.M. ºC ISO 2719 / ASTM D93 ۱۴۰ min ۱۳۵ min ۱۴۶
Pourpoint ºC ISO 3016 -۳۰ max -۴۰ max -۵۷
Neutralisation value mg KOH/g
IEC 296 / IEC

۶۲۰۲۱

< 0.03 ۰٫۰۱ max < 0.03 Corrosive Sulphur   DIN 51353 Non- corrosive Non- corrosive Non-corrosive Breakdown voltage (after treatment) kV IEC 156 / IEC ۶۰۱۵۶ Min 50 After treatment Min 70 After treatment > 30

(>70 upon treatment)

>60 ex works

(>70 upon treatment)

Water content

(ex works)

ppm IEC 60814

۱۰ – ۱۵
Dielectric dissipation factor at 90ºC (after treatment)   DIN 57370 / IEC 247 ۰٫۰۰۵ max ۰٫۰۰۵ max ۰٫۰۰۱
Oxidation Stability

(۱۶۴h/100ºC)

Neutralisation value

Sludge content

mgKOH/g

%m

IEC 1125 A

۰٫۴۰ max

۰٫۱ max

–

–

۰٫۲

۰٫۰۲

Oxidation Stability

(۱۶۴h/120ºC)

Total acidity

Sludge

Tan delta 90ºC

mg KOH/g

%m

IEC 1125 C  / IEC 61125 C

۱٫۲ max

۰٫۸ max

–

۱٫۲ max

۰٫۸ max

۰٫۵ max

۰٫۹

۰٫۳

۰٫۰۷

These characteristics are typical of current production. Whilst future production will conform to Shell’s specification, variations in these characteristics may occur.