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引用第11楼Jim-Guo于2007-05-22 20:06发表的 :
简单讲,三层绝缘线就是用了三层皮.
我有个问题,就是我在初次级间加了两个普通10NF电容,用于滤波,在变压器两边一边一个,其中一个是在光耦与变压器之间.请问这个电容与变压器的空间距离有无具体要求,是指爬电和电隙. 
你的品是什么產品？
下面是引用“EN 60950-1-2006”
1.5.6 Capacitors bridging insulation
A capacitor connected between two line conductors in a PRIMARY CIRCUIT, or between one line
conductor and the neutral conductor or between the PRIMARY CIRCUIT and protective earth
shall comply with one of the subclasses of IEC 60384-14 and shall be used in accordance with its rating. This requirement also applies to a capacitor bridging DOUBLE INSULATION or REINFORCED INSULATION elsewhere in the equipment. The details of the damp heat, steady state test as specified in 4.12 of IEC 60384-14 shall be as follows:
− Temperature: 40 °C ± 2 °C;
− Humidity: 93 % ± 3 % relative humidity;
− Test duration: 21 days.
NOTE 1 Capacitors that have been subjected to a test duration longer than 21 days are considered to have met
the test duration criteria.
The above requirement does not apply to a capacitor connected between a HAZARDOUS
VOLTAGE SECONDARY CIRCUIT and protective earth, where only BASIC INSULATION is required.
NOTE 2 The test of 5.2.2 still applies between the HAZARDOUS VOLTAGE SECONDARY CIRCUIT and protective earth.
The appropriate capacitor subclass shall be selected from those listed in Table 1C, according
to the rules of application in the table. |
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