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need to note the clause below:6 [% {" H# K) @8 ^0 y( I2 [
IEC60950:
6 \7 P' D7 }9 {* G' C& D P1.5.9.2 Protection of VDRs
6 X* v: _8 M0 v, Q( s7 e$ zFor protection against
* y4 @+ V1 Q# d+ N+ |− temporary overvoltages above the maximum continuous voltage,
1 \' h7 m2 |4 U: y5 l$ n8 y− thermal overload due to leakage current within the VDR, and' Y W3 j' v) U5 ~/ T
− burning and bursting of the VDR in the event of a short-circuit fault,1 Y# b+ C# R) J# S& T# U
an interrupting means having an adequate breaking capacity shall be connected in series with+ p) r% a: |9 i0 I. c
the VDR. This requirement does not apply to a VDR in a LIMITED CURRENT CIRCUIT.6 T- H {- r& A5 s7 P1 C2 T% M8 c
t" g9 C, j0 Q, `' N9 ?* G, N
IEC60065:- d$ f( ^0 A& d7 _, z
– thermal stress
8 r4 m( B+ R4 Y8 ]For apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor
% E# _. W& G; m2 i$ oconnected in series with the apparatus shall be energised from an a.c. source of 250 V.7 J+ S# v$ G: B0 ~- H
The voltage source shall be applied for 4 h or until the circuit path through the varistor2 c8 o+ z k! }4 R9 `# \
opens for each of the test series resistance values: 2 000 Ω, 500 Ω, 250 Ω, 50 Ω. A! T0 @6 \0 |! ? V/ I- ^
separate apparatus shall be used for each resistor value, unless damage from the previous
' h2 H: K8 v- i8 G e; ntest has been repaired.
1 M& k: b. \5 y9 U) `6 HAt the end of each test, the apparatus shall comply with clause 11. |
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发表于 2010-4-22 16:26
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