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看标准EN600065：2 d- C. x3 q3 A- }! M( u
14.12 Surge suppression varistors9 L% ^8 c5 Y3 I% v+ N
Surge suppression varistors used in order to prevent MAINS overvoltages coming into the
5 w7 @) c$ l: E, S% ]% Kapparatus shall comply with IEC 61051-2.! q% G% I9 }9 m" _: \
Such components shall not be connected between parts connected to the MAINS and
& \. H3 u6 J6 t/ d8 o! gACCESSIBLE conductive parts or parts connected to them, except for earthed parts of
5 J/ ]( z1 C& b, U: u- ?PERMANENTLY CONNECTED APPARATUS.
; N% H: m0 d1 N+ D% E. U N
: Q2 S; ~) C' y4 D/ DReference is made to IEC 61051-2 where the following requirements apply:, s: y6 O; P8 M8 Q+ V5 r5 s
– preferred climatic categories (2.1.1 of IEC 61051-2)7 R5 U6 p* j- E! i
maximum lower temperature: –10 °C5 I: B3 A; K( B
minimum upper temperature: +85 °C
" @7 p, V3 i9 g8 U- A$ b p8 w minimum duration of climatic tests: 21 days6 Z% r, ^( v/ {* s g! x
– maximum continuous voltages (2.1.2 of IEC 61051-2)2 |# u2 k- X6 l/ J$ h4 u
/ _5 P* S2 [# Z1 a1 hThe minimum value of the maximum continuous a.c. voltage shall be 1,2 times the RATED
4 n; k& \& K8 FSUPPLY VOLTAGE of the apparatus. z2 e/ Z# W7 F( L0 k! f
– current pulse rating (IEC 61051-2, subclause 2.1.2)( ?8 I$ p/ @1 z9 k9 c
( ]) }% L0 n) h/ ?& Q
Surge suppression varistors shall withstand a combination pulse of 6 kV/3 kA with voltage% m0 o/ f0 N! ]- d6 V4 u1 @" \
waveform of 1,2/50 s and current waveform of 8/20 s.- g) V5 a) h, c$ c) c1 e# X
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Compliance is checked by applying the test of IEC 61051-2, group 1. After the test, the
2 o$ _6 U9 i( m' m2 c" Z' A+ r6 Y. Wvaristor voltage (as defined in IEC 61051) shall not have changed by more than 10 % when
2 N$ w+ d% M8 z& `' hmeasured with the manufacturer’s specified current.6 F, P/ E. T( Q
– fire hazard (IEC 61051-2, table I, group 6)( O; m0 ]4 V8 O! w% @
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The coating of surge suppression varistors shall have a flammability category V-0 or better
9 N" ^* t9 ?" N1 X: b3 qaccording to IEC 60707.- q1 ~! ?; R& s* c
Compliance is checked according to IEC 60707 or according to clause G.1.1 of annex G.0 B# m( J! v" r3 G" h" P
– thermal stress
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For apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor7 g% `/ m$ L0 {
connected in series with the apparatus shall be energised from an a.c. source of 250 V.2 i, F6 O- {+ w' V
The voltage source shall be applied for 4 h or until the circuit path through the varistor
5 g" M9 ?- a8 M# U1 Sopens for each of the test series resistance values: 2 000 , 500 , 250 , 50 . A8 A; S1 H4 y) g7 R! A* J" `/ [
separate apparatus shall be used for each resistor value, unless damage from the previous
: H4 T$ i6 I, |2 m1 l1 o6 Stest has been repaired.
; i; O" X: U7 s, Z) ?At the end of each test, the apparatus shall comply with clause 11. |
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发表于 2013-2-27 09:35
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