Friday, November 29, 2013

IEC standards

IEC 60038 Standard voltages IEC 60076-2 Power transformers - Temperature rise IEC 60076-3 Power transformers - Insulation levels, dielectric tests and external clearances in air IEC 60076-5 Power transformers - Ability to withstand short-circuit IEC 60076-10 Power transformers - Determination of sound levels IEC 60146 Semiconductor convertors - General requirements and line...

Thursday, November 28, 2013

A hipot tester

A hipot tester is an electronic device used to verify the electrical insulation in a device or other wired assembly that could subject someone to a shock if it failed. It generally consists of:   1.            A source of high voltage, 2.            A current meter, ...

MILLIVOLT DROP TEST

The millivolt drop test is generally associated with testing for weld quality on the armature. It is the best test for verifying armature weld quality. The millivolt drop test is the ultimate electrical test for detecting bad welds. Unfortunately, it is difficult to make on armatures with large diameter wire and nearly impossible to make on armatures with small wires....