Tag Archives: testing

Skipper successfully type tests 33MVA, 161kV Power Transformer for Short Circuit & Impulse

Skipper is always committed to serve its customers by meeting the stated as well as implied standards for the products and providing them with solutions exceeding their satisfaction levels. In our bid to provide high quality and reliable products, our product designs are continuously optimized and validated through various routine, special and type tests.

Skipper after all manufacturing operations, conducted all routine tests on a 33 MVA, 161/11.5 kV EHV Transformer.
To verify and validate its Design, to withstand Lighting Impulse voltages and Mechanical forces resulting from Short circuit faults, Skipper sent the Transformer to CPRI Bhopal, a well reputed, NABL accredited independent laboratory for the following tests:
• Lighting Impulse Test
• Dynamic short circuit Tests

The above tests were conducted from 8th-11th June, 2015 as per IEC 60076 P 3, by applying Lighting and Chopped wave shots to all HV and LV terminals including the Neutral Short circuit shots were applied to each of the HV terminal while LV terminals were shorted. The test was witnessed by our valued client M/s GRIDCo, a Power Transmission Company of Republic of Ghana. These tests proved that Design and manufacturing was robust to withstand above test application at CPRI.

IEC standard specifies Lightning and Chopped wave Tests at different voltage levels depending upon safety and reliability requirement of the installation. However, this transformer was subjected to the highest among the choice of test levels specified by IEC standard for the voltage class of Transformers.
Earlier, Skipper type-tested its 60MVA, 132/33kV Power transformer at CPRI by conducting Lighting Impulse and Short Circuit Tests.

With these tests the capability of transformer to withstand high stresses due to Lightning Impulse and Dynamic Short circuit forces over the long periods (in excess of 30 years) of service is ensured.

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