EXTERNAL VALIDATION OF ISO 17025

EXTERNAL VALIDATION OF ISO 17025

On 27 and 28 February 2012, the High Voltage Department was being validated for the ISO 17025 system, the process included the validation of the existing system and its expansion to other areas of high voltage testing. The Department expanded its area of accredited measurements from the alternating voltage testing in dry environment to alternating voltage testing without limitations in dry environment, since the Department designed its own artificial rain device. The breakdown and direct high voltage testing methods have been added to the extended accreditation list, the expansion of the accreditation scope also includes two other testing methods. The first method is the partial discharges measurement; the second method is the measurement of radio interference voltage (RIV). Figure 1 presents the required iron construction that simulates the carrying pillar of the isolation chain. In this way the distances and operational conditions, which apply as the real situation when the isolator is operating, are completely reached. The mentioned construction is used in measuring the corona and RIV.