Question

Objectives of testing significance of i.S. Concept of tolerance, routinetests, type tests, special tests

Answer 1

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➢ Temperature rise test.

➢ Lightening impulse test.

➢ Sound level measurement. 5.3 SPECIAL TESTS.

➢ Measurement of insulation resistance.

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Answer 2

a) Type Test

A transformer's type tests are conducted on the manufacturer's premises to ensure that the design requirements and consumer specifications are met. The type tests are carried out on a prototype unit rather than all manufactured units, and they confirm the transformer's basic and main design criteria.

• Transformation ratio test
• Winding resistance test of transformer
• Measurement of core losses and no-load current through open-circuit test.
• Measurement of short circuit impedance and copper losses through short-circuit test
• Transformer vector group test.

b) Routine Test of a transformer.

Routine transformer testing are carried out to check the transformer's operating performance and are carried out on every unit manufactured.

• Winding resistance test of transformer
• Transformation ratio test
• Measurement of core losses and no-load current through open-circuit test.
• Measurement of short circuit impedance and copper losses through short-circuit test.
• Transformer vector group test

c) Special Test.

Special transformer tests are carried out based on the needs of the customer in order to acquire information that will be relevant during the transformer's operation and maintenance.