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请参考IEC60950-1 Annex Q中描述如下:; ]. o' y5 a8 a* C3 \+ _2 T
A VDR used in a PRIMARY CIRCUIT shall comply with IEC 61051-2, with the following details.
( N; D {6 H; x5 M) W: Y6 Oa) Preferred climatic categories (2.1.1 of IEC 61051-2)" r7 d: y! g. m4 A
Lower category temperature: - 10 °C# A& r9 X6 p0 d0 M
Upper category temperature: + 85 °C2 Y; N% ?2 |1 H* N3 m
Duration of damp heat, steady state test: 21 days
- x4 P6 J5 d7 Z8 v8 k: q Y1 lb) Maximum continuous voltage (2.1.2 of IEC 61051-2)3 b; _- c/ f5 A3 l$ y! A! M5 J
The maximum continuous a.c. voltage is selected from the list of preferred voltages and! M7 I. Y1 c. S9 p
shall be at least 120 % of7 d' [* e! A( q8 r
− the RATED VOLTAGE of the equipment or
* U! D" H$ @ v− the upper voltage of the RATED VOLTAGE RANGE of the equipment.
: @8 l3 H8 h4 `& Kc) Pulse current (Table I group 1 of IEC 61051-2). i1 {9 {& H% \- A' S
Combination pulses of 6 kV/3 kA of alternating polarity are used, having a pulse shape of4 E* k$ x& J+ c
1,2/50 μs for voltage and 8/20 μs for current.
/ s$ F: g% S" e: ]- S: ]) h" |% MIn addition to the performance requirements of Table I group 1, the clamping voltage after the4 g4 b, ?# ^4 B
test shall not have changed by more than 10 % when measured with the manufacturer's; W$ u; f0 Z$ v8 w& ?6 i
specified current. |
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