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5.12 For heating appliances and combined appliances, when it is specified that the
/ R0 M% T) B7 Y6 H' F# Jappliance has to operate at a power input multiplied by a factor, this applies only to heating. C& G1 s' F9 C9 g. q( H4 f
elements without appreciable positive temperature coefficient of resistance.) f. |/ u$ H0 v' J/ }
For heating elements with appreciable positive temperature coefficient of resistance, other than
! G8 p- i2 m) e0 {9 vPTC heating elements, the supply voltage is determined by supplying the appliance at rated9 L- h5 I$ b/ \( r, c" L
voltage until the heating element reaches its operating temperature. The supply voltage is then
[# x0 F! Z! L& J4 o5 \1 cCopyright International Electrotechnical Commission
5 @ J, Q( G, V d1 Mrapidly increased to the value necessary to give the power input required for the relevant test,
0 e7 R' a) ^$ k ~) tthis value of the supply voltage being maintained throughout the test.2 {$ ^: _, y: L1 ~" T3 Y
NOTE In general, the temperature coefficient is considered to be appreciable if, at rated voltage, the power input) r/ @ _2 H' g7 W
of the appliance in cold condition differs by more than 25 % from the power input at operating temperature.2 B8 Q! B4 c6 J# k, e% Q
5.13 The tests for appliances with PTC heating elements and for heating appliances and
. r, D9 x- m' _6 b) g* pcombined appliances where the heating elements are supplied via a switch mode power
- q4 w) g" `* P/ q! `, t( jsupply are carried out at a voltage corresponding to the specified power input.% e) ]1 [, {2 p2 ]) ]
When a power input greater than the rated power input is specified, the factor for multiplying
9 X: U& y8 L! ythe voltage is equal to the square root of the factor for multiplying the power input. |
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发表于 2012-10-14 22:14
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