标题: 单根电线的耐压测试 [打印本页] 作者: 19800108 时间: 2009-7-31 14:26 标题: 单根电线的耐压测试 各位老兄，小弟想请教下单根导线的耐压测试是怎样做的呢，是不是用高压机直接钳住电线的一端，但另外一个钳应钳住那里呢？作者: moonxu 时间: 2009-7-31 14:30
简单的方法是：用一盆水,把线浸到水里，留着线头和尾露出水面25CM固定好。测试仪的地线接到水里，高压端连接导体。按设定时间测试。就可以了。作者: 城市妖 时间: 2009-7-31 14:36
我建议不要用1楼的方法做，这样很危险，毕竟是几个K 的高压呢，要是去离子水还可以接受，但我想应该不会有人这样做吧。: ^( x( P2 E! s" }
只要一端接导线铜芯，一端接线皮就行了。 * b4 ~( g0 s, h# R" b& ^- Cmoonxu 兄勿怪，只是说说我的想法。作者: moonxu 时间: 2009-7-31 14:44
呵呵！楼上的客气了。只是讨论讨论！！ 7 ?9 Z) `6 t* ]( S, {3 N6 N. ~2 e. r& c' h3 M
可惜的是整条的线皮可能很长的。怎么保证都能测试到呢？$ ]! V9 X) }/ z, T2 k1 A
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耐压测试是要带绝缘手套，垫绝缘脚板的。盆子可能是我没讲清楚，应该用胶盆并使外面保证没打湿。作者: cloud.huang 时间: 2009-7-31 14:48
线皮上再加铝箔,一般认证过的内部线2000V都没问题.作者: hekejiu 时间: 2009-7-31 15:09
按国家标准,必须是放在水中,进行水浴电压测试作者: 城市妖 时间: 2009-7-31 15:09
moonxu 说的有道理，但是还是觉得很危险。 # k) [, k7 y, F- ?- b! y* E我司有很多买不到的线都是定做的，检测的时候剪下一小段，做线皮对线芯的耐压就够了，倒是没有考虑过均一性问题。作者: 19800108 时间: 2009-7-31 15:55
各位老兄；有没有相关的标准看下的哟。作者: moonxu 时间: 2009-7-31 16:14
UL15828 J" ~1 N3 A, o0 q) q5 Y) c- Q
UL817 & a2 w% O+ T9 v9 m论坛里就有，自己找一下。作者: wwnw_007 时间: 2009-7-31 16:15
水浴法是标准要求的方法，一是采用塑料盆，外表不能湿；二是采用金属盆，需要接地，此方法只须高压棒接触电线芯就行，三是采用标准的水槽，四是采用金属箔包裹电线绝缘外，也可以的。作者: stevenyu 时间: 2009-7-31 16:27
UL 2556中對絕緣耐壓測試有三種方式. 5 E, l' ^; t3 k$ D, s; _6.2 Dielectric voltage-withstand _2 c* t7 T% e* D: i7 C
6.2.1 Scope # d$ V# k: ?7 {; C' H- P% HThis test establishes the methods for determining the dielectric voltage-withstand of a wire or cable. 0 O% p2 q% \6 ~: y; O: _6.2.2 Apparatus 5 M* [4 k" C$ U& s1 MThe apparatus shall consist of2 Q+ y; W" ?% W4 F
a) an isolation transformer capable of supplying a test potential of 48 to 62 Hz, whose output4 R# H1 G5 O7 B
potential is continuously variable from near zero to at least the specified rms test potential; % u9 t2 P7 h" v' z2 r3 C- Hb) a voltmeter having an accuracy of ±5%, on the high voltage side of the transformer. If # L1 N8 W; \' Hanalog, it shall have a response time that does not introduce a lagging error greater than 1% of , E) d* d" e& B! k/ E5 k( P/ ofull scale at the specified rate of increase in voltage; * w1 E! h# e: x fc) a fault current indicator;7 l/ J- [& J6 [. `, g% X6 s: O
d) a forced-air oven as described in Clause 4.2.3 Item (i), having insulated bushings for0 v4 j- O% j s9 R, c2 T
connection of the test voltage while the oven is closed; 2 a: z; O$ ? v4 F1 j: u4 x' Z# We) a temperature-measuring device with an accuracy of ±1 °C; F X2 }* c2 \, x, S- L; a
f) a tank filled with tap water; and7 q0 J$ Y/ z9 K
g) a means of grounding, maximum impedance of 15W.3 P/ _1 ]) F5 A8 ]0 n
6.2.3 Preparation of specimens4 g% H$ q2 Y; b( ]1 u; r
6.2.3.1 Method 1 (in water) . z9 D" k& ^* x5 S& OBoth ends of the individual conductors shall be made bare." p, Z/ M" i8 ~# `
In preparing the wire for test, each end of the specimen shall be brought out well above the water level: a7 H' f+ ~7 F5 S! z
in the tank, where applicable, and the covering removed from the surface of the insulation for a short- }- a* l+ P" b1 B- J# [. W; P5 D
distance if necessary to prevent surface leakage. The temperature of the water in which the specimen is% j g, H9 L/ G" z+ s W
immersed need not be controlled unless specified in the product standard.9 t& ?+ d# g6 n; h! [+ A4 R& j
Unless specifically required by the product standard, a shielded or metal-covered single-conductor % e- I& P6 I$ [6 Zspecimen need not be immersed in water, the test voltage being applied between the conductor and the! U2 _2 ~8 R; Z1 I* d
shield or metal covering.* `. O& W( h. k/ x- s$ @( M
Unless specifically required by the product standard, a multiconductor cable need not be immersed in . {7 {+ F# {9 @ q( y+ lwater, the test voltage being applied between each conductor and the electrode, consisting of all other! T$ V) p1 L$ X6 t* H5 G5 A$ H% J
conductors connected together and to all shields and metal coverings, as applicable., ?, r6 f& L) B, e' x1 Q* u& @' b
In all cases, the ends of the conductor of the specimen shall be spaced from the grounded electrode a) ]% c* {" R& a0 l" `9 \
sufficient distance to prevent corona or flashover at the ends during application of the test voltage. + b( Y( ~( W( R/ s9 j: N6.2.3.2 Method 2 (in air) ' q' ^ P' U! _% L- l4 EBoth ends of the individual conductors shall be made bare., {0 p' I* _$ L) ]" [
For a single-conductor cable, a grounding electrode, when not present as a component, shall be applied. 8 g S- \8 ?8 x8 z" n) YA snug-fitting close-weave copper braid, a metallic tape, or graphite have been found to be acceptable. a0 Y1 t5 b2 O5 I; w' O" n
6.2.3.3 Method 3 (in air at elevated temperature) " U$ T B0 t6 {. A3 z8 qBoth ends of the individual conductors shall be made bare. ( [ P' X* W( R# ~3 i. T# \For a single-conductor cable, a grounding electrode, when not present as a component shall be applied.! T1 c8 ?# U9 M+ I; T1 g" q. Z
A snug-fitting close-weave copper braid, a metallic tape, or graphite have been found to be acceptable.作者: zy3618 时间: 2010-6-25 23:44
浸水，或在空气中作者: pz02010 时间: 2010-6-26 11:26
本人认为都可以，但是从个方面考虑和看的实验来说，才用绝缘包铝铂只最使用的。 8 m% l/ A4 k- ]# E虽然存在偏差，但是几千伏的电压也不会太在乎那些，再说耐压测试机本身的电压也是存在电压不稳的可能，所以为了安全和方便，本人支持绝缘包铝铂作者: jeremyho88 时间: 2010-6-26 14:28
要说方便与安全，在水中并无什么不妥。水箱外面有水也无妨，反正是接在低压端，不存在安全性。金属箔包覆在电线外表，如果电线长的话，就不太方便作者: keyou 时间: 2010-6-26 16:50
