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need to note the clause below:
# v9 _) q2 `3 B" JIEC60950:2 G- ]; {: b& j$ z. ~3 M3 V# K
1.5.9.2 Protection of VDRs# s% `" K5 ~) P9 }5 A
For protection against- B% _+ o V) p
− temporary overvoltages above the maximum continuous voltage,- w+ ]2 B# z5 a4 F1 w. W( U7 J
− thermal overload due to leakage current within the VDR, and
0 d' a( _6 E) o* ?' H! |) w− burning and bursting of the VDR in the event of a short-circuit fault,2 k+ O, H1 |$ a* g7 u
an interrupting means having an adequate breaking capacity shall be connected in series with
5 ?8 c! h, S" \ j5 zthe VDR. This requirement does not apply to a VDR in a LIMITED CURRENT CIRCUIT.$ ^2 o4 Z' d$ o% I! p- k F% A* I
1 R2 P4 S% D- L& ?3 e
IEC60065:
. y6 o/ ?4 \* A. h– thermal stress8 J6 L% g' H9 S5 K5 s, u, O0 p
For apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor {8 Q" H; h5 s
connected in series with the apparatus shall be energised from an a.c. source of 250 V.* K( h, ]4 U5 P0 m1 U( [
The voltage source shall be applied for 4 h or until the circuit path through the varistor: k |! S, H1 }# W* Q0 ? K9 b5 D$ ]
opens for each of the test series resistance values: 2 000 Ω, 500 Ω, 250 Ω, 50 Ω. A
! ~& e; r" g$ Wseparate apparatus shall be used for each resistor value, unless damage from the previous
4 q7 c' y! `! K$ ftest has been repaired.: {7 u2 ^6 K# a& E: ^
At the end of each test, the apparatus shall comply with clause 11. |
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