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看标准EN600065：
+ H$ q x1 S- M8 s14.12 Surge suppression varistors" a |7 |* X& ]5 P+ O* m
Surge suppression varistors used in order to prevent MAINS overvoltages coming into the
, S! G, F" g$ Mapparatus shall comply with IEC 61051-2.$ m J; E6 r1 r% l S- C
Such components shall not be connected between parts connected to the MAINS and3 @0 R) G( h& l' y, r
ACCESSIBLE conductive parts or parts connected to them, except for earthed parts of
* Q6 a9 H, ^8 WPERMANENTLY CONNECTED APPARATUS.
R. H+ Y' ^9 m
- B' g7 U( V( E* d1 mReference is made to IEC 61051-2 where the following requirements apply:0 Y- p. @6 U$ X( }+ e" D/ R
– preferred climatic categories (2.1.1 of IEC 61051-2)
6 ?7 v# T, n9 O9 A2 |* t( r maximum lower temperature: –10 °C
3 y5 m5 [" S: |/ c+ F p# U- R minimum upper temperature: +85 °C. `3 t6 A& q' J" C) h1 k
minimum duration of climatic tests: 21 days
4 T' H# b# O4 p/ B– maximum continuous voltages (2.1.2 of IEC 61051-2)0 A* m' `: G: y3 e) W' W, A
- b6 _, g' B( b- @8 e) R# lThe minimum value of the maximum continuous a.c. voltage shall be 1,2 times the RATED* e. M4 G- \9 ?" P$ x% p
SUPPLY VOLTAGE of the apparatus.5 d0 i! d" z! N; n7 O+ h% [+ S
– current pulse rating (IEC 61051-2, subclause 2.1.2)
/ [, i8 T4 D2 @6 j$ ?2 r; F. y5 e, Q0 T9 e1 F5 f
Surge suppression varistors shall withstand a combination pulse of 6 kV/3 kA with voltage) V, k, Q+ @" V
waveform of 1,2/50 s and current waveform of 8/20 s.# O6 o& e! F; |( j
7 Y9 |" n7 x$ G. R0 QCompliance is checked by applying the test of IEC 61051-2, group 1. After the test, the, J7 a0 J$ D/ y) f
varistor voltage (as defined in IEC 61051) shall not have changed by more than 10 % when( ]1 p2 a+ E6 E6 K. v' Y- w: ?
measured with the manufacturer’s specified current.
8 y; z# ~" A8 c& H% n' D! B/ K– fire hazard (IEC 61051-2, table I, group 6)% ]( ?0 E, D7 Y9 }8 G, f" Y
9 V# N# |% x0 l1 p: Z" y5 ?! w J
The coating of surge suppression varistors shall have a flammability category V-0 or better v/ y/ @- N. F
according to IEC 60707.3 o) n! H5 _9 A5 t7 u
Compliance is checked according to IEC 60707 or according to clause G.1.1 of annex G.& l: h5 L( g; E* R) N' Z. E V+ p J
– thermal stress
5 a$ Q4 y9 ~6 o* D$ W5 o/ e6 H
" q8 [& R; j" }6 f# K! ]+ C1 zFor apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor T0 f( l. V: ~4 }" s' E6 o
connected in series with the apparatus shall be energised from an a.c. source of 250 V.+ Z* {0 p- A$ C) p
The voltage source shall be applied for 4 h or until the circuit path through the varistor
7 a8 A) G1 O/ E3 x' I4 I, ~& popens for each of the test series resistance values: 2 000 , 500 , 250 , 50 . A4 G) }; ]- _3 n- `! h, O' k
separate apparatus shall be used for each resistor value, unless damage from the previous
% S+ m% V. K" m2 v- ~test has been repaired.
" y/ H, h+ m+ ^# j2 W( vAt 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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