球压的问题

pjf123119

广东安规检测
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IEC60335试验指甲

洗脚盆发热线紧靠塑料外壳，洗脚盆只有温控器无热断路器。
% s2 {! h6 |5 o- x4 m* i
在短路温控器后，发热线温升达到170K，由于紧挨塑料，由此认为塑料外壳的温升达到170K。
! K- z$ d8 C7 ^6 O. J! K3 b7 g
6 s- e5 G& S  S2 `8 P在这样高温度下测试球压，170+25=195度。测试结果直径大于2cm，是否认为不符合标准要求？

我之前很少拿非正常温升来进行球压的，心里没底。

pjf123119

另外，我不清楚球压考核的目的是什么，请各位帮忙解答。

hncjy365

球压考核的是非金属材料的耐热性能

天空之城

应该属于不合格，压痕大于2MM了就不能通过了

tianchi0305

如果是附加绝缘或者加强绝缘就要测试非正常的温升  也是要看非正常+25K和正常温升+40K那个数值大就算哪个了

Safeguards

球压考核的是非金属材料在一定温度下的变形情况，如果变形厉害可能会影响安全。从你的描述来看，做的方法没有问题，应属于不合格。

Jim-Guo

这个肯定NG. 找原因吧，要么改材料，要么修改设计。

zengyongxing

你布点的时候就布在塑料上，不要布在发热丝上，或者把塑料与发热丝间的距离加大的吧

Tomzhang

球压测试请参考IEC60335-1 part 30.
8 a6 b; Q; B% I7 v- E+ w30 Resistance to heat and fire
, e6 q' N8 J7 n1 C30.1 External parts of non-metallic material, parts of insulating material supporting live
parts including connections, and parts of thermoplastic material providing supplementary
8 S- \; W  J1 g* B% z2 Yinsulation or reinforced insulation, shall be sufficiently resistant to heat if their deterioration
1 m! L& {4 U; e0 |  l! d4 ucould cause the appliance to fail to comply with this standard.
This requirement does not apply to the insulation or sheath of flexible cords or internal wiring.
Compliance is checked by subjecting the relevant part to the ball pressure test of
IEC 60695-10-2.
The test is carried out at a temperature of 40 °C ± 2 °C plus the maximum temperature rise
) m% I9 F& u3 M- F& _determined during the test of clause 11, but it shall be at least
4 o* l# Z' u- ^– 75 °C ± 2 °C, for external parts;
9 x0 f) R: g7 s– 125 °C ± 2 °C, for parts supporting live parts.
However, for parts of thermoplastic material providing supplementary insulation or
7 ?4 R' E, a# G5 U  lreinforced insulation, the test is carried out at a temperature of 25 °C ± 2 °C plus the
/ W: m) W! K4 ?9 j/ B1 n0 U8 B) a, l+ }maximum temperature rise determined during the tests of clause 19, if this is higher. The
: j- ~, a1 O# ctemperature rises of 19.4 are not taken into account provided that the test is terminated by
6 t9 |* R! n- a3 w  Hthe operation of a non-self-resetting protective device and it is necessary to remove a
. w& F5 d6 a8 J" `; _; c& Ecover or use a tool to reset it.
60335-1  IEC:2001 – 177 –
* i1 `% {& X) F& GNOTE 1 For coil formers, only those parts that support or retain terminals in position are subjected to the test.
# s4 F! E$ K+ W; k: b8 }NOTE 2 The test is not carriedout on parts of ceramic material.
" A! _- \9 o; i2 E! _NOTE 3 The selection and sequence of tests for resistance to heat are shown in figure O.1.