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看标准EN600065：0 c8 l# V% W" d3 L
14.12 Surge suppression varistors( x1 V8 K5 z% j6 \; S/ y) w
Surge suppression varistors used in order to prevent MAINS overvoltages coming into the
. O. e* U. ?3 j6 gapparatus shall comply with IEC 61051-2.
! d2 D! {" ^ x M% e* jSuch components shall not be connected between parts connected to the MAINS and
. a @) k7 C; f# iACCESSIBLE conductive parts or parts connected to them, except for earthed parts of
* ~; [5 X/ R$ `* [4 ~PERMANENTLY CONNECTED APPARATUS.' q6 `9 b2 {! C9 ] f
0 W( R& R/ k" u) v) D1 t6 eReference is made to IEC 61051-2 where the following requirements apply:
8 b: y- h$ |+ Y. q' O |; O- w# T– preferred climatic categories (2.1.1 of IEC 61051-2): _% c/ l3 `: b. x( v5 R( k
maximum lower temperature: –10 °C8 K; t' Q# ^; V9 Y7 O
minimum upper temperature: +85 °C, Z$ F+ _3 I5 L" f
minimum duration of climatic tests: 21 days9 i( |7 ~8 O. D0 x
– maximum continuous voltages (2.1.2 of IEC 61051-2); b) a- S% h6 c' ^) d8 [
1 z$ e1 k, w2 H, |The minimum value of the maximum continuous a.c. voltage shall be 1,2 times the RATED
% W% |# {1 R& oSUPPLY VOLTAGE of the apparatus.
$ Y* T% A7 U c7 z8 _$ U– current pulse rating (IEC 61051-2, subclause 2.1.2)6 t- H5 H, z5 `8 L
& T: r) W/ }* O3 f+ v4 @Surge suppression varistors shall withstand a combination pulse of 6 kV/3 kA with voltage
& H1 M( z9 w3 D: Dwaveform of 1,2/50 s and current waveform of 8/20 s.! d1 e4 B# k# r7 m
9 H! R* x0 L9 B% e, e1 GCompliance is checked by applying the test of IEC 61051-2, group 1. After the test, the
! j c! h! B* t V$ Y" l4 Bvaristor voltage (as defined in IEC 61051) shall not have changed by more than 10 % when- ~7 h: T, C& G' o, s
measured with the manufacturer’s specified current./ R, i7 L9 u! t; k$ v* s6 ^7 b
– fire hazard (IEC 61051-2, table I, group 6)' O- ?- ]# \2 f1 ]* m ^) @
/ C% T$ A+ I+ }& [The coating of surge suppression varistors shall have a flammability category V-0 or better& D+ W5 l" b) U. l) p3 ~
according to IEC 60707.8 E0 n' W7 y2 `
Compliance is checked according to IEC 60707 or according to clause G.1.1 of annex G.
1 z6 [: Y6 q' } c1 `3 x2 j– thermal stress
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8 ~4 u4 _8 F, P+ c B4 B! UFor apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor+ }; k5 s6 |. @! V; D+ c
connected in series with the apparatus shall be energised from an a.c. source of 250 V.
4 v9 Q- a- U. h8 KThe voltage source shall be applied for 4 h or until the circuit path through the varistor8 u' |. a, s4 ? B5 |7 t6 s7 Y
opens for each of the test series resistance values: 2 000 , 500 , 250 , 50 . A9 L4 P5 k" J9 ]8 @1 N0 b
separate apparatus shall be used for each resistor value, unless damage from the previous& _( w9 j3 f8 U$ I& }
test has been repaired.) U) v) U* X3 I1 a8 I3 G6 e
At the end of each test, the apparatus shall comply with clause 11. |
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