BEHAVIOUR OF POWER TRANSFORMER UHV-LEAD EXIT SYSTEMS UNDER MECHANICAL VIBRATION STRESS AS OCCURRING DURING TRANSPORTATION

High voltage apparatuses are stressed mechanically mainly while being transported and during earthquakes. To prove withstand capability against transport conditions, mechanical vibration tests are applied in specialized laboratories with shaking (or vibration) tables to assess critical components. The specifications of such test procedures consist of random vibration tests (e.g. transport with truck, railway) and of shock/impulse tests (e.g. handling with fork-lift). This paper describes such a test which was performed with a real ultra-high-voltage transformer lead exit system, presents results and proposes consequences on manufacturing and transportation of transformer lead exits. Caution has not only to be taken by designing transformer lead exit systems with respect to transportation…