This part of GB/T 1408 gives requirements additional to those in GB/T 1408.1 for the determination of the electric strength of solid insulating materials under 1,2/50 μs impulse voltage stress.
2 Normative References
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1408.1-2016 Insulating Materials - Test Methods for Electric Strength - Part 1: Test at Power Frequencies (IEC 60243-1: 2013, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 1408.1-2016 apply.
3.1
full impulse-voltage wave
aperiodic transient voltage that rises rapidly to a maximum value, then falls less rapidly to zero (see Figure 1)
3.2
peak value of an impulse-voltage wave
Up
maximum value of voltage
3.3
virtual peak value of an impulse-voltage wave
U1
value derived from a recording of an impulse-voltage wave on which high-frequency oscillations, or overshoot of a limited magnitude, may be present
3.4
virtual origin of an impulse-voltage wave
O1
point of intersection O1 with the line of zero voltage of a line drawn through the points of 0,3 and 0,9 times the virtual peak value on the front of an impulse-voltage wave
GB/T 1408.3-2016 The following standards are cited：
GB/T 1408.3-2016 Cited by the following standards：
