Megger Instruments Limited

Simon Haynes

Simon Clark

Stanislaw Zurek

Anthony Courtney

Test apparatus is provided for testing an electrical property of a fluid. The apparatus comprises an electrically conductive container () forming an outer electrode of a test cell for containing the fluid, an inner electrode () of the test cell, an inductive heating assembly () and a cooling means. The inner electrode () of the test cell is arranged, when mounted relative to the electrically conductive container (), to project into, and remain electrically isolated from, the electrically conductive container (). The inductive heating assembly () comprises an inductive heating coil (), which surrounds the electrically conductive container (), for heating the electrically conductive container () and the inner electrode (). The cooling means comprises an air channel () to allow passage of air across a surface of the electrically conductive container (), for cooling of the electrically conductive container ().

Test apparatus and method for testing an electrical property of a fluid

A test vessel assembly comprises a central test vessel defining a chamber in which a sample to be tested may be stored. A pair of side adjustable electrodes is received in the chamber and immersed in the sample under test to determine the breakdown voltage of the sample. A gap between the electrodes can be adjusted by respective electrode adjusting moved in and out of the test vessel by rotation of an associated adjusting wheel. To prevent the breakdown in air rather than in the sample, care is taken to ensure sufficiently large creepage and clearance distances between the connections to the electrodes and from the connections to the electrodes to a wall of the test chamber. To this end, the adjusting wheels include convolutions that mesh with corresponding convolutions in the test vessel.

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Dover, United Kingdom

Simon Haynes