In any business, be it a toy store or transformer oil sales, there are many fine points to consider. Knowing them will save you time and money. In this article, we will look into the process of supply and receipt of transformer dielectric insulating oil.
Every sale of transformer insulating oil must be accompanied by the correct technical documentation. The information required on the batch can be given in original certificates or in official extracts from the original documents.
Receipt and acceptance occurs before removing the oil for use from the shipping container or tank. Ooil samples must be taken and analyzed for compliance with the product’s claimed and documented performance specifications. Among the parameters that must be varified are:
- dielectric strength;
- flashpoint;
- acidity;
- water soluble acid and base content;
- particulate matter; and
- water.
An analysis of the oil’s oxidation stability and dissipation factor at 90ºС/194ºF should be performed for electric power transformers of 110kV and above. This analysis should also include transformers of especially important facilities regardless of the voltage class or level. If the oxidation stability analysis is to be performed after the oil leaves the shipping container, it is recommended to take samples in the presence of the oil supplier.
For the protection of your company whether buying or selling, and to facilitate arbitration in the matter, should the need arise, one of the samples should be sealed and stored. This will provide all the parties with an used sample of the oil so that the initial oil quality may be detemined even after the oil has been used.
Samples are taken in the following cases:
- If supplied in rail road or truck tanks, samples are taken before draining from each tank
- If supplied in barrels, the number of samples is determined by the terms of supply, however, there should be at least 1 sample per 10 tons of supplied oil.
If the results of the laboratory analysis are favorable, the transformer oil is taken to the client and pumped into the buyer’s tanks. The oil is then either stored or treated before being used in oil filled equipment like transformers and oil filled switches. Transformer insulating oil is transferred from tanks through hoses using additional special equipment at the storage facility.
If the lab results show that the purity of the oil is not in compliance with the established standard(s), the product must be purified immediately or prior to placement in the oil filled equipment. Failure to do so will most likely result in preamture equipment failure and unscheduled equipment down time.
GlobeCore manufactures and supplies mobile oil treatment units such as the Mobile Oil Station type CMM-M. The GlobeCore CMM-M units are designed for degassing, removal of particulate matter and heating of dielectric insulating oils used in electric power transformers of up to 1150 kV. The CMM-M units can be used to heat oil filled electrical systems with hot oil as well as for vacuum drying and vacuumizing of oil filled equipment.
The following advantages of the GlobeCore CMM-M units should be noted:
- Purification of dielectric insulating oil in one cycle;
- Significant service life extension of insultaing oil and equipment;
- Wide range of equipment options; and
- Simple operation and servicing.
The CMM-M units can operate in one of three modes:
- filtration;
- filtration with heating; and
- thermovacuum purification and oil degassing.