کاسترول، (به انگلیسی: Castrol) شرکت بریتانیایی تولیدکننده انواع روغنها، گریسهای صنعتی و روانسازهای مورد استفاده در صنعت خودروسازی است که از سال ۲۰۰۰ تاکنون، یکی از نشانهای تجاری شرکت بیپی محسوب میشود.
Product Data Castrol Transformer Oil
Castrol Transformer Oil is a high quality, mineral based insulating oil which meets or exceeds IEC
۶۰۲۹۶ (۰۳), ASTM D3457, IEEEC 57, 106, BS 148 and AS 1767 and is designed for use in transformers and electrical switchgear.
This product contains re-processed oil.
Purity – the oil as an insulant
Freedom from traces of water, dust and fibrous material is of the highest importance in a transformer oil. The presence of such contaminants in an oil seriously lowers its electrical strength by creating paths for the passage of a spark or arc. The term “electrical purity” has been used in these notes to express this feature.
Transformer Oil, where supplied in 205 litre drums, possesses a guaranteed electrical strength of 40 kV minimum at time of filling. Where supplied in smaller containers this guarantee cannot be maintained owing to the difficulty of ensuring absolute cleanliness of these containers.
In all forms of energy conversion, be they mechanical or electrical, some losses are unavoidable and these usually result in the formation of heat. If, after a limited initial temperature rise, this heat is not dissipated as rapidly as it is formed, the temperature of the system may climb to a dangerous level. Electrical transformers are no exception to this general rule. There is a definite, and rather low, limit to the maximum temperature that they can be allowed to attain. This limit is set by the insulation; if it is exceeded, the insulation will break down and the transformer will fail.
Heat can be dissipated in three way, by convection, by radiation and by conduction, each of which comes into play for the heat generated in the iron core and copper conductors of a transformer.
In most large units an intermediate medium for heat dissipation is provided by the oil, the rate of heat transfer is mainly governed by the oil’s heat conductivity and heat capacity, and by the effect of convection.
Heat removal by oil is mainly a function of viscosity, since a less viscous fluid is able to circulate more rapidly under the effect of convection. Accordingly, transformer oils should have the lowest possible viscosity consistent with its other desirable properties.
Low viscosity oil, too, is more “efficient” in this action. It circulates more easily within the winding and ducts of the transformer and thus helps to prevent the formation of local hot spots. Transformer Oil is formulated to a relatively low viscosity to ensure efficient heat dissipation.
Although low viscosity is a desirable feature, oils of low viscosity generally have the highest volatility. Transformer Oil is formulated with a base oil having a low vapour pressure at the operation temperature of the equipment to ensure that loss by evaporation and undue fire risk may be avoided.
Volatility is one of the chief factors setting the lower limit of viscosity. The flash point of oil is related to its volatility and it must be recognized that whenever hot petroleum oils are in contact with electrical equipment, fire and explosion are potential risks. To lessen these hazards Transformer Oil exceeds the
minimum flashpoint of 1400C. This flash point is appreciably higher than the maximum temperature a transformer is likely to reach.
Low Pour Point
Transformer Oil has a relatively low pour point to resist wax separation at low temperatures.
High Chemical Stability
Transformers may generate excessive temperatures, either from high loading or sludge formation impeding heat transference. These temperature increases place additional stresses on the insulation materials and the oil. Under these conditions the rate of oxidation and acidity increase in the oil may be delayed or inhibited by the addition of antioxidants. Transformer Oil has been developed to satisfy these arduous operation conditions.
The major components of oil filled switchgear are circuit-breakers, current and potential transformers and bus-bar chambers.
With switchgear components the chief function of the oil is the quenching of the electric arc that forms between the contacts as they separate. However, insulation and cooling are also important. The most important requirement in quenching an arc is that it should occur in the shortest possible time especially when the circuit-breaker, for example, is operating to clear an electrical fault. It has been found this effect is best achieved with oils as low as possible in viscosity consistent with other requirements. The desirable properties of switchgear oils coincide approximately with those of transformer oils and in practice identical oils are used.
Transformer Oil meets or exceeds IEC 60296 (03), ASTM D3457, IEEEC 57, 106, BS 148 and AS 1767 for transformer oil for transformers and switchgear.
Property Units Test Method
DBPC Concentration %w/w ASTM D2668 ۰٫۳
Corrosive Sulphur n/a ASTM D1275B and Cigre Method TF A2.32.01 Non corrosive
Specific Gravity 15C/15C n/a ASTM D1298 ۰٫۹۱ max
Density @ 15C Kg/L ASTM D4052 ≤۰٫۸۹۵
Flash Point (closed cup) Deg C ASTM D93 ≥۱۴۰
Gassing Tendency Ul/min IEC 60628 ≤+۳۰
Breakdown Voltage kV IEC 60156 ≥۵۰
Dielectric Dissipation Factor (DDF) @ 90C % IEC 60247 ≤۰٫۳
Resistivity @ 90C Gohm.m IEC 60247 ≥۲۰۰
Moisture Content Mg/kg IEC 60814 ≤۲۵ (bulk)
Appearance n/a ASTM D1524 Clear & Bright
Acidity mgKOH/g ASTM D974 ≤۰٫۰۱
Interfacial Surface Tension (IFT) mN/m ASTM D971 ≥۴۰
Oxidation Stability after 500hrs n/a IEC 1125 Method C Pass
Total Furan Mg/kg IEC 61198 ≤۰٫۱
Mg/kg ASTM D4059 Not detectable
Transformer Oil is classified as non hazardous according to the criteria of NOHSC. However, in line with safe handling practices, it is recommended that the handling instructions outlined in the Castrol Material Safety Data Sheet be followed.
Transformer Oil is classified as a C1 combustible liquid for storage and handling purposes. Store in a cool, dry, well-ventilated area out of direct sunlight. Avoid sparks, flames and other ignition sources. Store away from incompatible materials such as materials that support combustion (oxidising materials). Reference should be made to Australian Standard AS1940 – The storage and handling of flammable
and combustible liquids.
Spillage: SMALL – 20 LITRES OR LESS
Soak up on Castrol Diatomaceous Earth or similar inert oil absorbent. Arrange for disposal through an approved facility.
LARGE – GREATER THAN 20 LITRES
Contain as soon as possible, remove by best means available and arrange recycling
(preferred) or disposal through an approved facility.
Disposal: New or used material must not be allowed to enter the ground, ground water, water courses, sewers or drainage systems. Advice may be sought from the Environmental Protection Authority or from the local waste disposal authority.
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