This part of the IEC 60243 standard gives additional requirements to those in IEC 60243-1 for the determination of the electrical power of solid insulating materials under direct voltage stress. This third edition cancels and replaces the second edition published in 2001 and constitutes an editorial revision.
For an inhomogeneous test sample, it is determined by the impedance (largely capacitive). With an increasing direct voltage, the voltage distribution can still be largely capacitive, but partially dependent on the voltage rise rate. The resistive voltage distribution after constant voltage application represents the steady state state. The choice between direct or alternating voltage depends on the purpose for which the fault test will be used and to some extent the intended application of the material.
Upon direct application of voltage, the following currents occur:
In addition, for materials with different layers or discontinuities, the voltage distribution across the test specimen as a result of interfacial polarization is also affected by charges of opposite polarity, which can build up on either side of the interface and create sufficiently local fields. strong enough to cause partial discharge or deterioration of test specimens.
For most materials, the dc breakdown voltage is higher than the peak value of the power frequency breakdown voltage; for many materials, especially inhomogeneous, the dc breakdown voltage will be three times higher than ac.
The test voltage applied to the electrodes will be supplied by a power supply with the following specifications and components.
A voltage selection of positive or negative polarity shall be provided so that one of the connections of the electrodes is grounded.
The voltage fluctuation in the test voltage should not exceed 50% of the voltage at all values greater than 2% of the breakdown voltage. The test voltage should also be free from transients or other fluctuations exceeding 1% of the applied voltage.
EUROLAB, together with its state-of-the-art accredited laboratories and expert team, helps you to get precise and fast results within the scope of IEC 60243-2 test.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
EUROLABreporting and certification activities, United Accreditation Foundation (UAF), Turkish Accreditation Agency (TÜRKAK) ve Enterprise Accreditation Foundation (EAF) based on the accreditation provided by the accreditation body. The Enterprise Accreditation Foundation (EAF) accreditation body is also a signatory of the United Nations (UN GLOBAL COMPACT) organization.
