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Sample Blog #2

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5 Atransformer can be defined as a power delivering equipment that functions in the internal environment, leading to substantial heat production. So, it becomes important to restrict the flow of power through the transformer for the functioning of equipment. This leads to the need for both insulators and coolant devices for operation. Therefore, transformer oil is the one important component in the power devices which results in the protected and easy functioning of the equipment.

While operating, the transformer oil undergoes electrical, thermal, and mechanical stresses. As it operates in high temperatures, the oil is contaminated by chemical interactions with windings & other solid insulation. This results in deterioration leaving the insulating oil ineffective.

Therefore, the transformer oil must be tested regularly to determine if it is suitable for continuous use. These tests are further classified into Electrical, Chemical, and Physical tests to determine the oil’s quality.

The majority of utilities test the transformer oil by in-house test equipment or testing it with the help of 3rd party contractor. While conducting this testing the updated oil testing standards and practices are left unconsidered.

The major concerns while testing by non-accredited methods are-

Whether the operator is performing the test as per test criteria mentioned by statutory bodies like IS, ANSI & IEC Test equipment is properly calibrated as per IS standards ensuring that consumer security and no deceptive practices are considered. While performing the tests climatic & physical conditions are vital to be monitored and recorded as they impact test results. The above-mentioned conditions for transformer oil testing are not necessarily considered in a non-accredited lab. Because of non-standardized methods, conducted test results largely differ from the actual values. Therefore the test results change from actual results by many parameters like misconduct of test procedure, presence of moisture content, non-calibrated equipment, etc. Hence, every transformer oil should be tested by the NABL accredited test lab.

The purpose of the NABL is to provide a third-party assessment to ensure excellent quality and technical competence of testing and calibration laboratories, which enables the government and the industry to streamline and maintain the standardized quality environment.

NABL accreditation is based on the evaluation of technical competence whereas ISO certification is based upon verification of proper documentation and periodic audits.

The major concerns while testing by non-accredited methods are-

Whether the operator is performing the test as per test criteria mentioned by statutory bodies like IS, ANSI & IEC
Test equipment is properly calibrated as per IS standards ensuring that consumer security and no deceptive practices are considered.
While performing the tests climatic & physical conditions are vital to be monitored and recorded as they impact test results.
The above-mentioned conditions for transformer oil testing are not necessarily considered in a non-accredited lab. Because of non-standardized methods, conducted test results largely differ from the actual values. Therefore the test results change from actual results by many parameters like misconduct of test procedure, presence of moisture content, non-calibrated equipment, etc. Hence, every transformer oil should be tested by the NABL accredited test lab.