标题: UL778 [打印本页] 作者: JIES 时间: 2008-10-17 14:18 标题: UL778 UL778中的Dielectric voltage-ithstand： ; _+ H3 x. I* N; L35.1.1 A pump shall with stand for 1 minute without breakdown the application of a 60-hertz, essentially sinusoidal potential:6 r i: G5 P8 H {) I- q5 M& j. ?
a)Between live parts and grounded dead metal and( T5 O0 M m" Y
b)Between the terminals of a capacitor used for radio interference elimination or arc suppression.The test potential shall be as follows: ) u+ M; k5 A: L5 c% I; y1)One thousand volts for a nonsubmersible pump rated no more than 250 volts, and no more than 1/2 horsepower(373 watt output)./ r7 [" o$ e7 w
2)One thousand volts plus twice the rated voltage for a nonsubmersible pump rated more than 250 volts, or more than 1/2 horsepower. ' b5 _7 f, g2 P. X3)One thousand volts plus twice the rated voltage for a submersible pump. * w; F$ m+ G# q3 F" t 5 f- G2 D+ o8 F$ s. V35.1.2 The required test potential may be obtained from any convenient source of sufficient capacity at least 500 volt-amperes capable of maintaining the potential at the required test value except during breakdown.The voltage of the source is to be continuously variable. , m2 N* w( F' X0 R" E6 PException: A 500 volt-ampere or larger capacity transformer need not be used if the transformer is provided with a voltmeter to directly measure the applied output potential. 5 a% g G! F! v0 s C/ k8 w6 A
35.1.3 In the case of a DC pump, the test potential is to be direct current. , r6 ~/ S2 H! u) E , h+ F( e' y' i0 {/ x: `& V看的不是很明白，那位高手幫忙指點指點。