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以下引自IEC 60065-2005 % G& h# s u7 a* g
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(异常测试时,变压器的温升可以超出限值,注意下面的红色字体和蓝色字体部分。)/ l) f9 D0 A" i; l9 [& U3 g9 }/ t
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11.2.5 Windings
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The temperature rise of windings shall not exceed the values given in Table 3, items b) and d)
. m4 G$ W1 \# y+ [0 w" A# j"Fault conditions", with the following exceptions.
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– If the temperature is limited due to the operation of replaceable or resettable protective devices, the temperature rises may be exceeded until 2 min after the operation of the device.( E% x; h" r2 q- m8 k' W
! @, I c: s3 I' B s) n" MIn the case of windings providing protection against electric shock or where a fault could result in a fire hazard, the test is carried out three times and the winding is then subjected to the dielectric strength test of 10.3 without the humidity treatment of 10.2, starting within 1 min after the temperature rise measurement. No failure is allowed. j0 z! x5 S5 p/ t& I" Z0 O
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– If the temperature is limited due to the operation of an integral non-resettable or a nonreplaceable protective device or due to the open circuiting of a winding, the temperature rises may be exceeded, but the test shall be carried out three times using new components.
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In the case of windings providing protection against electric shock or where a fault could result in a fire hazard, the winding is then in each case subjected to the dielectric strength test of 10.3 without the humidity treatment of 10.2, starting within 1 min after the temperature rise measurement.
) p( ]1 R* N/ c) ~No failure is allowed.
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- P" ?, \: B3 P; v– Higher temperature rises are allowed for windings, provided a failure of their insulation cannot cause an electric shock hazard or a fire hazard and that they are not connected to sources capable of supplying power in excess of 5 W under normal operating conditions. ( A, r8 E6 K% N* v( z1 L
# l3 B, j$ B: F7 v/ O H+ G. E– If a temperature rise value is exceeded and if there is doubt as to whether or not a hazard exists, the insulation concerned is short-circuited and the tests of 11.1 and 11.2.2 are repeated.
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( `7 B$ g! s# }0 dNOTE: If the insulation is incorporated in a winding in such a way that its temperature rise cannot be measured directly, the temperature is assumed to be the same as that of the winding wire.
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