23.3 Electronic cord switches and electronic independently mounted switches shall, without) o& x- N' K: |* f0 q
endangering their surroundings, withstand the short circuits they may be subjected to.) N9 _8 x" {. O3 a/ r
Compliance is checked by the following test.
6 Y7 h( J( f; v& g6 o$ FThe switch is tested in a substantially non-inductive circuit in series with a load impedance and
4 s- c6 R1 @4 x# F3 T) S1 |/ Z2 ka device for limiting the let-through I2t.5 N/ O- G/ N1 G* y$ A
The prospective short circuit of the supply shall be 1 500 A r.m.s. at a voltage equal to the2 k1 W& b: i2 I# \% ^
rated voltage of the switch under test.5 |: F$ \/ z1 N( v
The prospective let-through I2t value shall be 15 000 A2s.4 Y! m% j4 {) b* }
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问题1：电子开关的短路试验如何做？$ h c. p! L( Y1 K% Y- P; C& o: @& f
问题2：这些参数如何实现？
7 H' I6 n( q& T9 q4 W! C( ^0 m: z/ }2 d% F% J m1 B8 N
NOTE 7 Attention is drawn to thefact that solenoid operated pneumatic means may result in an unintentional - q9 n; L2 A; I0 o( B( q
synchronization. 问题3：这一句是什么意思？ 7 `: C" l- j) w* l8 @9 I2 C
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发表于 2015-10-23 20:06
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