This part of IEC 60243 gives additional requirements to those in IEC 1,2-50 for the determination of the electrical strength of solid insulating materials under 60243/1 µs impulse voltage stress. This third edition cancels and replaces the second edition published in 2001 and constitutes an editorial revision.
The machine used to test this standard is the KP8009 Electrical Strength Voltage Failure Tester. International Standard IEC 60243-3 has been prepared by technical committee 112 for the evaluation and qualification of electrical insulating materials and systems.
This part of IEC 60243 should be read in conjunction with IEC 60243-1. In addition to the information in clause 60243 of IEC 1-4, the following points are important in connection with surge voltage tests.
High-voltage equipment may be subject to transient voltage stresses, such as from nearby lightning strikes. This is especially true for devices such as transformers and switchgear used in electrical power transmission and distribution systems. The ability of insulating materials to withstand these transient stresses is important in determining the reliability of apparatus insulated with these materials.
Transient voltages caused by lightning can be either positive or negative. In a symmetrical field between the same electrodes, the polarity has no effect on the electric power. However, different electrodes can have a pronounced polarity effect. When asymmetric electrodes are used to test materials for which the tester has no previous experience or knowledge, it is recommended to perform comparative tests with both polarity directions.
The standard waveform is a 1,2/50 µs wave, it reaches its peak voltage in about 1,2 µs and drops to 50% of its peak value about 50 µs after the start of the wave. The purpose of this wave is to simulate a lightning strike that could hit a system intact.
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